LCOV - code coverage report
Current view: top level - src/backend/utils/adt - xml.c (source / functions) Hit Total Coverage
Test: PostgreSQL 17beta1 Lines: 1404 1705 82.3 %
Date: 2024-05-29 10:10:37 Functions: 91 105 86.7 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*-------------------------------------------------------------------------
       2             :  *
       3             :  * xml.c
       4             :  *    XML data type support.
       5             :  *
       6             :  *
       7             :  * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
       8             :  * Portions Copyright (c) 1994, Regents of the University of California
       9             :  *
      10             :  * src/backend/utils/adt/xml.c
      11             :  *
      12             :  *-------------------------------------------------------------------------
      13             :  */
      14             : 
      15             : /*
      16             :  * Generally, XML type support is only available when libxml use was
      17             :  * configured during the build.  But even if that is not done, the
      18             :  * type and all the functions are available, but most of them will
      19             :  * fail.  For one thing, this avoids having to manage variant catalog
      20             :  * installations.  But it also has nice effects such as that you can
      21             :  * dump a database containing XML type data even if the server is not
      22             :  * linked with libxml.  Thus, make sure xml_out() works even if nothing
      23             :  * else does.
      24             :  */
      25             : 
      26             : /*
      27             :  * Notes on memory management:
      28             :  *
      29             :  * Sometimes libxml allocates global structures in the hope that it can reuse
      30             :  * them later on.  This makes it impractical to change the xmlMemSetup
      31             :  * functions on-the-fly; that is likely to lead to trying to pfree() chunks
      32             :  * allocated with malloc() or vice versa.  Since libxml might be used by
      33             :  * loadable modules, eg libperl, our only safe choices are to change the
      34             :  * functions at postmaster/backend launch or not at all.  Since we'd rather
      35             :  * not activate libxml in sessions that might never use it, the latter choice
      36             :  * is the preferred one.  However, for debugging purposes it can be awfully
      37             :  * handy to constrain libxml's allocations to be done in a specific palloc
      38             :  * context, where they're easy to track.  Therefore there is code here that
      39             :  * can be enabled in debug builds to redirect libxml's allocations into a
      40             :  * special context LibxmlContext.  It's not recommended to turn this on in
      41             :  * a production build because of the possibility of bad interactions with
      42             :  * external modules.
      43             :  */
      44             : /* #define USE_LIBXMLCONTEXT */
      45             : 
      46             : #include "postgres.h"
      47             : 
      48             : #ifdef USE_LIBXML
      49             : #include <libxml/chvalid.h>
      50             : #include <libxml/entities.h>
      51             : #include <libxml/parser.h>
      52             : #include <libxml/parserInternals.h>
      53             : #include <libxml/tree.h>
      54             : #include <libxml/uri.h>
      55             : #include <libxml/xmlerror.h>
      56             : #include <libxml/xmlsave.h>
      57             : #include <libxml/xmlversion.h>
      58             : #include <libxml/xmlwriter.h>
      59             : #include <libxml/xpath.h>
      60             : #include <libxml/xpathInternals.h>
      61             : 
      62             : /*
      63             :  * We used to check for xmlStructuredErrorContext via a configure test; but
      64             :  * that doesn't work on Windows, so instead use this grottier method of
      65             :  * testing the library version number.
      66             :  */
      67             : #if LIBXML_VERSION >= 20704
      68             : #define HAVE_XMLSTRUCTUREDERRORCONTEXT 1
      69             : #endif
      70             : 
      71             : /*
      72             :  * libxml2 2.12 decided to insert "const" into the error handler API.
      73             :  */
      74             : #if LIBXML_VERSION >= 21200
      75             : #define PgXmlErrorPtr const xmlError *
      76             : #else
      77             : #define PgXmlErrorPtr xmlErrorPtr
      78             : #endif
      79             : 
      80             : #endif                          /* USE_LIBXML */
      81             : 
      82             : #include "access/htup_details.h"
      83             : #include "access/table.h"
      84             : #include "catalog/namespace.h"
      85             : #include "catalog/pg_class.h"
      86             : #include "catalog/pg_type.h"
      87             : #include "commands/dbcommands.h"
      88             : #include "executor/spi.h"
      89             : #include "executor/tablefunc.h"
      90             : #include "fmgr.h"
      91             : #include "lib/stringinfo.h"
      92             : #include "libpq/pqformat.h"
      93             : #include "mb/pg_wchar.h"
      94             : #include "miscadmin.h"
      95             : #include "nodes/execnodes.h"
      96             : #include "nodes/miscnodes.h"
      97             : #include "nodes/nodeFuncs.h"
      98             : #include "utils/array.h"
      99             : #include "utils/builtins.h"
     100             : #include "utils/date.h"
     101             : #include "utils/datetime.h"
     102             : #include "utils/lsyscache.h"
     103             : #include "utils/rel.h"
     104             : #include "utils/syscache.h"
     105             : #include "utils/xml.h"
     106             : 
     107             : 
     108             : /* GUC variables */
     109             : int         xmlbinary = XMLBINARY_BASE64;
     110             : int         xmloption = XMLOPTION_CONTENT;
     111             : 
     112             : #ifdef USE_LIBXML
     113             : 
     114             : /* random number to identify PgXmlErrorContext */
     115             : #define ERRCXT_MAGIC    68275028
     116             : 
     117             : struct PgXmlErrorContext
     118             : {
     119             :     int         magic;
     120             :     /* strictness argument passed to pg_xml_init */
     121             :     PgXmlStrictness strictness;
     122             :     /* current error status and accumulated message, if any */
     123             :     bool        err_occurred;
     124             :     StringInfoData err_buf;
     125             :     /* previous libxml error handling state (saved by pg_xml_init) */
     126             :     xmlStructuredErrorFunc saved_errfunc;
     127             :     void       *saved_errcxt;
     128             :     /* previous libxml entity handler (saved by pg_xml_init) */
     129             :     xmlExternalEntityLoader saved_entityfunc;
     130             : };
     131             : 
     132             : static xmlParserInputPtr xmlPgEntityLoader(const char *URL, const char *ID,
     133             :                                            xmlParserCtxtPtr ctxt);
     134             : static void xml_errsave(Node *escontext, PgXmlErrorContext *errcxt,
     135             :                         int sqlcode, const char *msg);
     136             : static void xml_errorHandler(void *data, PgXmlErrorPtr error);
     137             : static int  errdetail_for_xml_code(int code);
     138             : static void chopStringInfoNewlines(StringInfo str);
     139             : static void appendStringInfoLineSeparator(StringInfo str);
     140             : 
     141             : #ifdef USE_LIBXMLCONTEXT
     142             : 
     143             : static MemoryContext LibxmlContext = NULL;
     144             : 
     145             : static void xml_memory_init(void);
     146             : static void *xml_palloc(size_t size);
     147             : static void *xml_repalloc(void *ptr, size_t size);
     148             : static void xml_pfree(void *ptr);
     149             : static char *xml_pstrdup(const char *string);
     150             : #endif                          /* USE_LIBXMLCONTEXT */
     151             : 
     152             : static xmlChar *xml_text2xmlChar(text *in);
     153             : static int  parse_xml_decl(const xmlChar *str, size_t *lenp,
     154             :                            xmlChar **version, xmlChar **encoding, int *standalone);
     155             : static bool print_xml_decl(StringInfo buf, const xmlChar *version,
     156             :                            pg_enc encoding, int standalone);
     157             : static bool xml_doctype_in_content(const xmlChar *str);
     158             : static xmlDocPtr xml_parse(text *data, XmlOptionType xmloption_arg,
     159             :                            bool preserve_whitespace, int encoding,
     160             :                            XmlOptionType *parsed_xmloptiontype,
     161             :                            xmlNodePtr *parsed_nodes,
     162             :                            Node *escontext);
     163             : static text *xml_xmlnodetoxmltype(xmlNodePtr cur, PgXmlErrorContext *xmlerrcxt);
     164             : static int  xml_xpathobjtoxmlarray(xmlXPathObjectPtr xpathobj,
     165             :                                    ArrayBuildState *astate,
     166             :                                    PgXmlErrorContext *xmlerrcxt);
     167             : static xmlChar *pg_xmlCharStrndup(const char *str, size_t len);
     168             : #endif                          /* USE_LIBXML */
     169             : 
     170             : static void xmldata_root_element_start(StringInfo result, const char *eltname,
     171             :                                        const char *xmlschema, const char *targetns,
     172             :                                        bool top_level);
     173             : static void xmldata_root_element_end(StringInfo result, const char *eltname);
     174             : static StringInfo query_to_xml_internal(const char *query, char *tablename,
     175             :                                         const char *xmlschema, bool nulls, bool tableforest,
     176             :                                         const char *targetns, bool top_level);
     177             : static const char *map_sql_table_to_xmlschema(TupleDesc tupdesc, Oid relid,
     178             :                                               bool nulls, bool tableforest, const char *targetns);
     179             : static const char *map_sql_schema_to_xmlschema_types(Oid nspid,
     180             :                                                      List *relid_list, bool nulls,
     181             :                                                      bool tableforest, const char *targetns);
     182             : static const char *map_sql_catalog_to_xmlschema_types(List *nspid_list,
     183             :                                                       bool nulls, bool tableforest,
     184             :                                                       const char *targetns);
     185             : static const char *map_sql_type_to_xml_name(Oid typeoid, int typmod);
     186             : static const char *map_sql_typecoll_to_xmlschema_types(List *tupdesc_list);
     187             : static const char *map_sql_type_to_xmlschema_type(Oid typeoid, int typmod);
     188             : static void SPI_sql_row_to_xmlelement(uint64 rownum, StringInfo result,
     189             :                                       char *tablename, bool nulls, bool tableforest,
     190             :                                       const char *targetns, bool top_level);
     191             : 
     192             : /* XMLTABLE support */
     193             : #ifdef USE_LIBXML
     194             : /* random number to identify XmlTableContext */
     195             : #define XMLTABLE_CONTEXT_MAGIC  46922182
     196             : typedef struct XmlTableBuilderData
     197             : {
     198             :     int         magic;
     199             :     int         natts;
     200             :     long int    row_count;
     201             :     PgXmlErrorContext *xmlerrcxt;
     202             :     xmlParserCtxtPtr ctxt;
     203             :     xmlDocPtr   doc;
     204             :     xmlXPathContextPtr xpathcxt;
     205             :     xmlXPathCompExprPtr xpathcomp;
     206             :     xmlXPathObjectPtr xpathobj;
     207             :     xmlXPathCompExprPtr *xpathscomp;
     208             : } XmlTableBuilderData;
     209             : #endif
     210             : 
     211             : static void XmlTableInitOpaque(struct TableFuncScanState *state, int natts);
     212             : static void XmlTableSetDocument(struct TableFuncScanState *state, Datum value);
     213             : static void XmlTableSetNamespace(struct TableFuncScanState *state, const char *name,
     214             :                                  const char *uri);
     215             : static void XmlTableSetRowFilter(struct TableFuncScanState *state, const char *path);
     216             : static void XmlTableSetColumnFilter(struct TableFuncScanState *state,
     217             :                                     const char *path, int colnum);
     218             : static bool XmlTableFetchRow(struct TableFuncScanState *state);
     219             : static Datum XmlTableGetValue(struct TableFuncScanState *state, int colnum,
     220             :                               Oid typid, int32 typmod, bool *isnull);
     221             : static void XmlTableDestroyOpaque(struct TableFuncScanState *state);
     222             : 
     223             : const TableFuncRoutine XmlTableRoutine =
     224             : {
     225             :     .InitOpaque = XmlTableInitOpaque,
     226             :     .SetDocument = XmlTableSetDocument,
     227             :     .SetNamespace = XmlTableSetNamespace,
     228             :     .SetRowFilter = XmlTableSetRowFilter,
     229             :     .SetColumnFilter = XmlTableSetColumnFilter,
     230             :     .FetchRow = XmlTableFetchRow,
     231             :     .GetValue = XmlTableGetValue,
     232             :     .DestroyOpaque = XmlTableDestroyOpaque
     233             : };
     234             : 
     235             : #define NO_XML_SUPPORT() \
     236             :     ereport(ERROR, \
     237             :             (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), \
     238             :              errmsg("unsupported XML feature"), \
     239             :              errdetail("This functionality requires the server to be built with libxml support.")))
     240             : 
     241             : 
     242             : /* from SQL/XML:2008 section 4.9 */
     243             : #define NAMESPACE_XSD "http://www.w3.org/2001/XMLSchema"
     244             : #define NAMESPACE_XSI "http://www.w3.org/2001/XMLSchema-instance"
     245             : #define NAMESPACE_SQLXML "http://standards.iso.org/iso/9075/2003/sqlxml"
     246             : 
     247             : 
     248             : #ifdef USE_LIBXML
     249             : 
     250             : static int
     251           0 : xmlChar_to_encoding(const xmlChar *encoding_name)
     252             : {
     253           0 :     int         encoding = pg_char_to_encoding((const char *) encoding_name);
     254             : 
     255           0 :     if (encoding < 0)
     256           0 :         ereport(ERROR,
     257             :                 (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
     258             :                  errmsg("invalid encoding name \"%s\"",
     259             :                         (const char *) encoding_name)));
     260           0 :     return encoding;
     261             : }
     262             : #endif
     263             : 
     264             : 
     265             : /*
     266             :  * xml_in uses a plain C string to VARDATA conversion, so for the time being
     267             :  * we use the conversion function for the text datatype.
     268             :  *
     269             :  * This is only acceptable so long as xmltype and text use the same
     270             :  * representation.
     271             :  */
     272             : Datum
     273         828 : xml_in(PG_FUNCTION_ARGS)
     274             : {
     275             : #ifdef USE_LIBXML
     276         828 :     char       *s = PG_GETARG_CSTRING(0);
     277             :     xmltype    *vardata;
     278             :     xmlDocPtr   doc;
     279             : 
     280             :     /* Build the result object. */
     281         828 :     vardata = (xmltype *) cstring_to_text(s);
     282             : 
     283             :     /*
     284             :      * Parse the data to check if it is well-formed XML data.
     285             :      *
     286             :      * Note: we don't need to worry about whether a soft error is detected.
     287             :      */
     288         828 :     doc = xml_parse(vardata, xmloption, true, GetDatabaseEncoding(),
     289         828 :                     NULL, NULL, fcinfo->context);
     290         780 :     if (doc != NULL)
     291         768 :         xmlFreeDoc(doc);
     292             : 
     293         780 :     PG_RETURN_XML_P(vardata);
     294             : #else
     295             :     NO_XML_SUPPORT();
     296             :     return 0;
     297             : #endif
     298             : }
     299             : 
     300             : 
     301             : #define PG_XML_DEFAULT_VERSION "1.0"
     302             : 
     303             : 
     304             : /*
     305             :  * xml_out_internal uses a plain VARDATA to C string conversion, so for the
     306             :  * time being we use the conversion function for the text datatype.
     307             :  *
     308             :  * This is only acceptable so long as xmltype and text use the same
     309             :  * representation.
     310             :  */
     311             : static char *
     312       22826 : xml_out_internal(xmltype *x, pg_enc target_encoding)
     313             : {
     314       22826 :     char       *str = text_to_cstring((text *) x);
     315             : 
     316             : #ifdef USE_LIBXML
     317       22826 :     size_t      len = strlen(str);
     318             :     xmlChar    *version;
     319             :     int         standalone;
     320             :     int         res_code;
     321             : 
     322       22826 :     if ((res_code = parse_xml_decl((xmlChar *) str,
     323             :                                    &len, &version, NULL, &standalone)) == 0)
     324             :     {
     325             :         StringInfoData buf;
     326             : 
     327       22826 :         initStringInfo(&buf);
     328             : 
     329       22826 :         if (!print_xml_decl(&buf, version, target_encoding, standalone))
     330             :         {
     331             :             /*
     332             :              * If we are not going to produce an XML declaration, eat a single
     333             :              * newline in the original string to prevent empty first lines in
     334             :              * the output.
     335             :              */
     336       22778 :             if (*(str + len) == '\n')
     337           6 :                 len += 1;
     338             :         }
     339       22826 :         appendStringInfoString(&buf, str + len);
     340             : 
     341       22826 :         pfree(str);
     342             : 
     343       22826 :         return buf.data;
     344             :     }
     345             : 
     346           0 :     ereport(WARNING,
     347             :             errcode(ERRCODE_INTERNAL_ERROR),
     348             :             errmsg_internal("could not parse XML declaration in stored value"),
     349             :             errdetail_for_xml_code(res_code));
     350             : #endif
     351           0 :     return str;
     352             : }
     353             : 
     354             : 
     355             : Datum
     356       22562 : xml_out(PG_FUNCTION_ARGS)
     357             : {
     358       22562 :     xmltype    *x = PG_GETARG_XML_P(0);
     359             : 
     360             :     /*
     361             :      * xml_out removes the encoding property in all cases.  This is because we
     362             :      * cannot control from here whether the datum will be converted to a
     363             :      * different client encoding, so we'd do more harm than good by including
     364             :      * it.
     365             :      */
     366       22562 :     PG_RETURN_CSTRING(xml_out_internal(x, 0));
     367             : }
     368             : 
     369             : 
     370             : Datum
     371           0 : xml_recv(PG_FUNCTION_ARGS)
     372             : {
     373             : #ifdef USE_LIBXML
     374           0 :     StringInfo  buf = (StringInfo) PG_GETARG_POINTER(0);
     375             :     xmltype    *result;
     376             :     char       *str;
     377             :     char       *newstr;
     378             :     int         nbytes;
     379             :     xmlDocPtr   doc;
     380           0 :     xmlChar    *encodingStr = NULL;
     381             :     int         encoding;
     382             : 
     383             :     /*
     384             :      * Read the data in raw format. We don't know yet what the encoding is, as
     385             :      * that information is embedded in the xml declaration; so we have to
     386             :      * parse that before converting to server encoding.
     387             :      */
     388           0 :     nbytes = buf->len - buf->cursor;
     389           0 :     str = (char *) pq_getmsgbytes(buf, nbytes);
     390             : 
     391             :     /*
     392             :      * We need a null-terminated string to pass to parse_xml_decl().  Rather
     393             :      * than make a separate copy, make the temporary result one byte bigger
     394             :      * than it needs to be.
     395             :      */
     396           0 :     result = palloc(nbytes + 1 + VARHDRSZ);
     397           0 :     SET_VARSIZE(result, nbytes + VARHDRSZ);
     398           0 :     memcpy(VARDATA(result), str, nbytes);
     399           0 :     str = VARDATA(result);
     400           0 :     str[nbytes] = '\0';
     401             : 
     402           0 :     parse_xml_decl((const xmlChar *) str, NULL, NULL, &encodingStr, NULL);
     403             : 
     404             :     /*
     405             :      * If encoding wasn't explicitly specified in the XML header, treat it as
     406             :      * UTF-8, as that's the default in XML. This is different from xml_in(),
     407             :      * where the input has to go through the normal client to server encoding
     408             :      * conversion.
     409             :      */
     410           0 :     encoding = encodingStr ? xmlChar_to_encoding(encodingStr) : PG_UTF8;
     411             : 
     412             :     /*
     413             :      * Parse the data to check if it is well-formed XML data.  Assume that
     414             :      * xml_parse will throw ERROR if not.
     415             :      */
     416           0 :     doc = xml_parse(result, xmloption, true, encoding, NULL, NULL, NULL);
     417           0 :     xmlFreeDoc(doc);
     418             : 
     419             :     /* Now that we know what we're dealing with, convert to server encoding */
     420           0 :     newstr = pg_any_to_server(str, nbytes, encoding);
     421             : 
     422           0 :     if (newstr != str)
     423             :     {
     424           0 :         pfree(result);
     425           0 :         result = (xmltype *) cstring_to_text(newstr);
     426           0 :         pfree(newstr);
     427             :     }
     428             : 
     429           0 :     PG_RETURN_XML_P(result);
     430             : #else
     431             :     NO_XML_SUPPORT();
     432             :     return 0;
     433             : #endif
     434             : }
     435             : 
     436             : 
     437             : Datum
     438           0 : xml_send(PG_FUNCTION_ARGS)
     439             : {
     440           0 :     xmltype    *x = PG_GETARG_XML_P(0);
     441             :     char       *outval;
     442             :     StringInfoData buf;
     443             : 
     444             :     /*
     445             :      * xml_out_internal doesn't convert the encoding, it just prints the right
     446             :      * declaration. pq_sendtext will do the conversion.
     447             :      */
     448           0 :     outval = xml_out_internal(x, pg_get_client_encoding());
     449             : 
     450           0 :     pq_begintypsend(&buf);
     451           0 :     pq_sendtext(&buf, outval, strlen(outval));
     452           0 :     pfree(outval);
     453           0 :     PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
     454             : }
     455             : 
     456             : 
     457             : #ifdef USE_LIBXML
     458             : static void
     459         132 : appendStringInfoText(StringInfo str, const text *t)
     460             : {
     461         132 :     appendBinaryStringInfo(str, VARDATA_ANY(t), VARSIZE_ANY_EXHDR(t));
     462         132 : }
     463             : #endif
     464             : 
     465             : 
     466             : static xmltype *
     467       21806 : stringinfo_to_xmltype(StringInfo buf)
     468             : {
     469       21806 :     return (xmltype *) cstring_to_text_with_len(buf->data, buf->len);
     470             : }
     471             : 
     472             : 
     473             : static xmltype *
     474          78 : cstring_to_xmltype(const char *string)
     475             : {
     476          78 :     return (xmltype *) cstring_to_text(string);
     477             : }
     478             : 
     479             : 
     480             : #ifdef USE_LIBXML
     481             : static xmltype *
     482       21928 : xmlBuffer_to_xmltype(xmlBufferPtr buf)
     483             : {
     484       21928 :     return (xmltype *) cstring_to_text_with_len((const char *) xmlBufferContent(buf),
     485             :                                                 xmlBufferLength(buf));
     486             : }
     487             : #endif
     488             : 
     489             : 
     490             : Datum
     491          42 : xmlcomment(PG_FUNCTION_ARGS)
     492             : {
     493             : #ifdef USE_LIBXML
     494          42 :     text       *arg = PG_GETARG_TEXT_PP(0);
     495          42 :     char       *argdata = VARDATA_ANY(arg);
     496          42 :     int         len = VARSIZE_ANY_EXHDR(arg);
     497             :     StringInfoData buf;
     498             :     int         i;
     499             : 
     500             :     /* check for "--" in string or "-" at the end */
     501         180 :     for (i = 1; i < len; i++)
     502             :     {
     503         144 :         if (argdata[i] == '-' && argdata[i - 1] == '-')
     504           6 :             ereport(ERROR,
     505             :                     (errcode(ERRCODE_INVALID_XML_COMMENT),
     506             :                      errmsg("invalid XML comment")));
     507             :     }
     508          36 :     if (len > 0 && argdata[len - 1] == '-')
     509           6 :         ereport(ERROR,
     510             :                 (errcode(ERRCODE_INVALID_XML_COMMENT),
     511             :                  errmsg("invalid XML comment")));
     512             : 
     513          30 :     initStringInfo(&buf);
     514          30 :     appendStringInfoString(&buf, "<!--");
     515          30 :     appendStringInfoText(&buf, arg);
     516          30 :     appendStringInfoString(&buf, "-->");
     517             : 
     518          30 :     PG_RETURN_XML_P(stringinfo_to_xmltype(&buf));
     519             : #else
     520             :     NO_XML_SUPPORT();
     521             :     return 0;
     522             : #endif
     523             : }
     524             : 
     525             : 
     526             : Datum
     527          30 : xmltext(PG_FUNCTION_ARGS)
     528             : {
     529             : #ifdef USE_LIBXML
     530          30 :     text       *arg = PG_GETARG_TEXT_PP(0);
     531             :     text       *result;
     532          30 :     xmlChar    *xmlbuf = NULL;
     533             : 
     534          30 :     xmlbuf = xmlEncodeSpecialChars(NULL, xml_text2xmlChar(arg));
     535             : 
     536             :     Assert(xmlbuf);
     537             : 
     538          30 :     result = cstring_to_text_with_len((const char *) xmlbuf, xmlStrlen(xmlbuf));
     539          30 :     xmlFree(xmlbuf);
     540          30 :     PG_RETURN_XML_P(result);
     541             : #else
     542             :     NO_XML_SUPPORT();
     543             :     return 0;
     544             : #endif                          /* not USE_LIBXML */
     545             : }
     546             : 
     547             : 
     548             : /*
     549             :  * TODO: xmlconcat needs to merge the notations and unparsed entities
     550             :  * of the argument values.  Not very important in practice, though.
     551             :  */
     552             : xmltype *
     553       21556 : xmlconcat(List *args)
     554             : {
     555             : #ifdef USE_LIBXML
     556       21556 :     int         global_standalone = 1;
     557       21556 :     xmlChar    *global_version = NULL;
     558       21556 :     bool        global_version_no_value = false;
     559             :     StringInfoData buf;
     560             :     ListCell   *v;
     561             : 
     562       21556 :     initStringInfo(&buf);
     563       64674 :     foreach(v, args)
     564             :     {
     565       43118 :         xmltype    *x = DatumGetXmlP(PointerGetDatum(lfirst(v)));
     566             :         size_t      len;
     567             :         xmlChar    *version;
     568             :         int         standalone;
     569             :         char       *str;
     570             : 
     571       43118 :         len = VARSIZE(x) - VARHDRSZ;
     572       43118 :         str = text_to_cstring((text *) x);
     573             : 
     574       43118 :         parse_xml_decl((xmlChar *) str, &len, &version, NULL, &standalone);
     575             : 
     576       43118 :         if (standalone == 0 && global_standalone == 1)
     577           0 :             global_standalone = 0;
     578       43118 :         if (standalone < 0)
     579       43106 :             global_standalone = -1;
     580             : 
     581       43118 :         if (!version)
     582       43100 :             global_version_no_value = true;
     583          18 :         else if (!global_version)
     584          12 :             global_version = version;
     585           6 :         else if (xmlStrcmp(version, global_version) != 0)
     586           0 :             global_version_no_value = true;
     587             : 
     588       43118 :         appendStringInfoString(&buf, str + len);
     589       43118 :         pfree(str);
     590             :     }
     591             : 
     592       21556 :     if (!global_version_no_value || global_standalone >= 0)
     593             :     {
     594             :         StringInfoData buf2;
     595             : 
     596           6 :         initStringInfo(&buf2);
     597             : 
     598           6 :         print_xml_decl(&buf2,
     599           6 :                        (!global_version_no_value) ? global_version : NULL,
     600             :                        0,
     601             :                        global_standalone);
     602             : 
     603           6 :         appendBinaryStringInfo(&buf2, buf.data, buf.len);
     604           6 :         buf = buf2;
     605             :     }
     606             : 
     607       21556 :     return stringinfo_to_xmltype(&buf);
     608             : #else
     609             :     NO_XML_SUPPORT();
     610             :     return NULL;
     611             : #endif
     612             : }
     613             : 
     614             : 
     615             : /*
     616             :  * XMLAGG support
     617             :  */
     618             : Datum
     619       21532 : xmlconcat2(PG_FUNCTION_ARGS)
     620             : {
     621       21532 :     if (PG_ARGISNULL(0))
     622             :     {
     623          18 :         if (PG_ARGISNULL(1))
     624           0 :             PG_RETURN_NULL();
     625             :         else
     626          18 :             PG_RETURN_XML_P(PG_GETARG_XML_P(1));
     627             :     }
     628       21514 :     else if (PG_ARGISNULL(1))
     629           0 :         PG_RETURN_XML_P(PG_GETARG_XML_P(0));
     630             :     else
     631       21514 :         PG_RETURN_XML_P(xmlconcat(list_make2(PG_GETARG_XML_P(0),
     632             :                                              PG_GETARG_XML_P(1))));
     633             : }
     634             : 
     635             : 
     636             : Datum
     637           6 : texttoxml(PG_FUNCTION_ARGS)
     638             : {
     639           6 :     text       *data = PG_GETARG_TEXT_PP(0);
     640             : 
     641           6 :     PG_RETURN_XML_P(xmlparse(data, xmloption, true));
     642             : }
     643             : 
     644             : 
     645             : Datum
     646           0 : xmltotext(PG_FUNCTION_ARGS)
     647             : {
     648           0 :     xmltype    *data = PG_GETARG_XML_P(0);
     649             : 
     650             :     /* It's actually binary compatible. */
     651           0 :     PG_RETURN_TEXT_P((text *) data);
     652             : }
     653             : 
     654             : 
     655             : text *
     656         168 : xmltotext_with_options(xmltype *data, XmlOptionType xmloption_arg, bool indent)
     657             : {
     658             : #ifdef USE_LIBXML
     659             :     text       *volatile result;
     660             :     xmlDocPtr   doc;
     661             :     XmlOptionType parsed_xmloptiontype;
     662             :     xmlNodePtr  content_nodes;
     663         168 :     volatile xmlBufferPtr buf = NULL;
     664         168 :     volatile xmlSaveCtxtPtr ctxt = NULL;
     665         168 :     ErrorSaveContext escontext = {T_ErrorSaveContext};
     666             :     PgXmlErrorContext *xmlerrcxt;
     667             : #endif
     668             : 
     669         168 :     if (xmloption_arg != XMLOPTION_DOCUMENT && !indent)
     670             :     {
     671             :         /*
     672             :          * We don't actually need to do anything, so just return the
     673             :          * binary-compatible input.  For backwards-compatibility reasons,
     674             :          * allow such cases to succeed even without USE_LIBXML.
     675             :          */
     676          36 :         return (text *) data;
     677             :     }
     678             : 
     679             : #ifdef USE_LIBXML
     680             :     /* Parse the input according to the xmloption */
     681         132 :     doc = xml_parse(data, xmloption_arg, true, GetDatabaseEncoding(),
     682             :                     &parsed_xmloptiontype, &content_nodes,
     683             :                     (Node *) &escontext);
     684         132 :     if (doc == NULL || escontext.error_occurred)
     685             :     {
     686          30 :         if (doc)
     687           0 :             xmlFreeDoc(doc);
     688             :         /* A soft error must be failure to conform to XMLOPTION_DOCUMENT */
     689          30 :         ereport(ERROR,
     690             :                 (errcode(ERRCODE_NOT_AN_XML_DOCUMENT),
     691             :                  errmsg("not an XML document")));
     692             :     }
     693             : 
     694             :     /* If we weren't asked to indent, we're done. */
     695         102 :     if (!indent)
     696             :     {
     697          18 :         xmlFreeDoc(doc);
     698          18 :         return (text *) data;
     699             :     }
     700             : 
     701             :     /* Otherwise, we gotta spin up some error handling. */
     702          84 :     xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_ALL);
     703             : 
     704          84 :     PG_TRY();
     705             :     {
     706          84 :         size_t      decl_len = 0;
     707             : 
     708             :         /* The serialized data will go into this buffer. */
     709          84 :         buf = xmlBufferCreate();
     710             : 
     711          84 :         if (buf == NULL || xmlerrcxt->err_occurred)
     712           0 :             xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
     713             :                         "could not allocate xmlBuffer");
     714             : 
     715             :         /* Detect whether there's an XML declaration */
     716          84 :         parse_xml_decl(xml_text2xmlChar(data), &decl_len, NULL, NULL, NULL);
     717             : 
     718             :         /*
     719             :          * Emit declaration only if the input had one.  Note: some versions of
     720             :          * xmlSaveToBuffer leak memory if a non-null encoding argument is
     721             :          * passed, so don't do that.  We don't want any encoding conversion
     722             :          * anyway.
     723             :          */
     724          84 :         if (decl_len == 0)
     725          72 :             ctxt = xmlSaveToBuffer(buf, NULL,
     726             :                                    XML_SAVE_NO_DECL | XML_SAVE_FORMAT);
     727             :         else
     728          12 :             ctxt = xmlSaveToBuffer(buf, NULL,
     729             :                                    XML_SAVE_FORMAT);
     730             : 
     731          84 :         if (ctxt == NULL || xmlerrcxt->err_occurred)
     732           0 :             xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
     733             :                         "could not allocate xmlSaveCtxt");
     734             : 
     735          84 :         if (parsed_xmloptiontype == XMLOPTION_DOCUMENT)
     736             :         {
     737             :             /* If it's a document, saving is easy. */
     738          36 :             if (xmlSaveDoc(ctxt, doc) == -1 || xmlerrcxt->err_occurred)
     739           0 :                 xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
     740             :                             "could not save document to xmlBuffer");
     741             :         }
     742          48 :         else if (content_nodes != NULL)
     743             :         {
     744             :             /*
     745             :              * Deal with the case where we have non-singly-rooted XML.
     746             :              * libxml's dump functions don't work well for that without help.
     747             :              * We build a fake root node that serves as a container for the
     748             :              * content nodes, and then iterate over the nodes.
     749             :              */
     750             :             xmlNodePtr  root;
     751             :             xmlNodePtr  newline;
     752             : 
     753          42 :             root = xmlNewNode(NULL, (const xmlChar *) "content-root");
     754          42 :             if (root == NULL || xmlerrcxt->err_occurred)
     755           0 :                 xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
     756             :                             "could not allocate xml node");
     757             : 
     758             :             /* This attaches root to doc, so we need not free it separately. */
     759          42 :             xmlDocSetRootElement(doc, root);
     760          42 :             xmlAddChild(root, content_nodes);
     761             : 
     762             :             /*
     763             :              * We use this node to insert newlines in the dump.  Note: in at
     764             :              * least some libxml versions, xmlNewDocText would not attach the
     765             :              * node to the document even if we passed it.  Therefore, manage
     766             :              * freeing of this node manually, and pass NULL here to make sure
     767             :              * there's not a dangling link.
     768             :              */
     769          42 :             newline = xmlNewDocText(NULL, (const xmlChar *) "\n");
     770          42 :             if (newline == NULL || xmlerrcxt->err_occurred)
     771           0 :                 xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
     772             :                             "could not allocate xml node");
     773             : 
     774         108 :             for (xmlNodePtr node = root->children; node; node = node->next)
     775             :             {
     776             :                 /* insert newlines between nodes */
     777          66 :                 if (node->type != XML_TEXT_NODE && node->prev != NULL)
     778             :                 {
     779          18 :                     if (xmlSaveTree(ctxt, newline) == -1 || xmlerrcxt->err_occurred)
     780             :                     {
     781           0 :                         xmlFreeNode(newline);
     782           0 :                         xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
     783             :                                     "could not save newline to xmlBuffer");
     784             :                     }
     785             :                 }
     786             : 
     787          66 :                 if (xmlSaveTree(ctxt, node) == -1 || xmlerrcxt->err_occurred)
     788             :                 {
     789           0 :                     xmlFreeNode(newline);
     790           0 :                     xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
     791             :                                 "could not save content to xmlBuffer");
     792             :                 }
     793             :             }
     794             : 
     795          42 :             xmlFreeNode(newline);
     796             :         }
     797             : 
     798          84 :         if (xmlSaveClose(ctxt) == -1 || xmlerrcxt->err_occurred)
     799             :         {
     800           0 :             ctxt = NULL;        /* don't try to close it again */
     801           0 :             xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
     802             :                         "could not close xmlSaveCtxtPtr");
     803             :         }
     804             : 
     805          84 :         result = (text *) xmlBuffer_to_xmltype(buf);
     806             :     }
     807           0 :     PG_CATCH();
     808             :     {
     809           0 :         if (ctxt)
     810           0 :             xmlSaveClose(ctxt);
     811           0 :         if (buf)
     812           0 :             xmlBufferFree(buf);
     813           0 :         if (doc)
     814           0 :             xmlFreeDoc(doc);
     815             : 
     816           0 :         pg_xml_done(xmlerrcxt, true);
     817             : 
     818           0 :         PG_RE_THROW();
     819             :     }
     820          84 :     PG_END_TRY();
     821             : 
     822          84 :     xmlBufferFree(buf);
     823          84 :     xmlFreeDoc(doc);
     824             : 
     825          84 :     pg_xml_done(xmlerrcxt, false);
     826             : 
     827          84 :     return result;
     828             : #else
     829             :     NO_XML_SUPPORT();
     830             :     return NULL;
     831             : #endif
     832             : }
     833             : 
     834             : 
     835             : xmltype *
     836       21688 : xmlelement(XmlExpr *xexpr,
     837             :            Datum *named_argvalue, bool *named_argnull,
     838             :            Datum *argvalue, bool *argnull)
     839             : {
     840             : #ifdef USE_LIBXML
     841             :     xmltype    *result;
     842             :     List       *named_arg_strings;
     843             :     List       *arg_strings;
     844             :     int         i;
     845             :     ListCell   *arg;
     846             :     ListCell   *narg;
     847             :     PgXmlErrorContext *xmlerrcxt;
     848       21688 :     volatile xmlBufferPtr buf = NULL;
     849       21688 :     volatile xmlTextWriterPtr writer = NULL;
     850             : 
     851             :     /*
     852             :      * All arguments are already evaluated, and their values are passed in the
     853             :      * named_argvalue/named_argnull or argvalue/argnull arrays.  This avoids
     854             :      * issues if one of the arguments involves a call to some other function
     855             :      * or subsystem that wants to use libxml on its own terms.  We examine the
     856             :      * original XmlExpr to identify the numbers and types of the arguments.
     857             :      */
     858       21688 :     named_arg_strings = NIL;
     859       21688 :     i = 0;
     860       21736 :     foreach(arg, xexpr->named_args)
     861             :     {
     862          54 :         Expr       *e = (Expr *) lfirst(arg);
     863             :         char       *str;
     864             : 
     865          54 :         if (named_argnull[i])
     866           0 :             str = NULL;
     867             :         else
     868          54 :             str = map_sql_value_to_xml_value(named_argvalue[i],
     869             :                                              exprType((Node *) e),
     870             :                                              false);
     871          48 :         named_arg_strings = lappend(named_arg_strings, str);
     872          48 :         i++;
     873             :     }
     874             : 
     875       21682 :     arg_strings = NIL;
     876       21682 :     i = 0;
     877       43340 :     foreach(arg, xexpr->args)
     878             :     {
     879       21658 :         Expr       *e = (Expr *) lfirst(arg);
     880             :         char       *str;
     881             : 
     882             :         /* here we can just forget NULL elements immediately */
     883       21658 :         if (!argnull[i])
     884             :         {
     885       21658 :             str = map_sql_value_to_xml_value(argvalue[i],
     886             :                                              exprType((Node *) e),
     887             :                                              true);
     888       21658 :             arg_strings = lappend(arg_strings, str);
     889             :         }
     890       21658 :         i++;
     891             :     }
     892             : 
     893       21682 :     xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_ALL);
     894             : 
     895       21682 :     PG_TRY();
     896             :     {
     897       21682 :         buf = xmlBufferCreate();
     898       21682 :         if (buf == NULL || xmlerrcxt->err_occurred)
     899           0 :             xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
     900             :                         "could not allocate xmlBuffer");
     901       21682 :         writer = xmlNewTextWriterMemory(buf, 0);
     902       21682 :         if (writer == NULL || xmlerrcxt->err_occurred)
     903           0 :             xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
     904             :                         "could not allocate xmlTextWriter");
     905             : 
     906       21682 :         xmlTextWriterStartElement(writer, (xmlChar *) xexpr->name);
     907             : 
     908       21730 :         forboth(arg, named_arg_strings, narg, xexpr->arg_names)
     909             :         {
     910          48 :             char       *str = (char *) lfirst(arg);
     911          48 :             char       *argname = strVal(lfirst(narg));
     912             : 
     913          48 :             if (str)
     914          48 :                 xmlTextWriterWriteAttribute(writer,
     915             :                                             (xmlChar *) argname,
     916             :                                             (xmlChar *) str);
     917             :         }
     918             : 
     919       43340 :         foreach(arg, arg_strings)
     920             :         {
     921       21658 :             char       *str = (char *) lfirst(arg);
     922             : 
     923       21658 :             xmlTextWriterWriteRaw(writer, (xmlChar *) str);
     924             :         }
     925             : 
     926       21682 :         xmlTextWriterEndElement(writer);
     927             : 
     928             :         /* we MUST do this now to flush data out to the buffer ... */
     929       21682 :         xmlFreeTextWriter(writer);
     930       21682 :         writer = NULL;
     931             : 
     932       21682 :         result = xmlBuffer_to_xmltype(buf);
     933             :     }
     934           0 :     PG_CATCH();
     935             :     {
     936           0 :         if (writer)
     937           0 :             xmlFreeTextWriter(writer);
     938           0 :         if (buf)
     939           0 :             xmlBufferFree(buf);
     940             : 
     941           0 :         pg_xml_done(xmlerrcxt, true);
     942             : 
     943           0 :         PG_RE_THROW();
     944             :     }
     945       21682 :     PG_END_TRY();
     946             : 
     947       21682 :     xmlBufferFree(buf);
     948             : 
     949       21682 :     pg_xml_done(xmlerrcxt, false);
     950             : 
     951       21682 :     return result;
     952             : #else
     953             :     NO_XML_SUPPORT();
     954             :     return NULL;
     955             : #endif
     956             : }
     957             : 
     958             : 
     959             : xmltype *
     960         138 : xmlparse(text *data, XmlOptionType xmloption_arg, bool preserve_whitespace)
     961             : {
     962             : #ifdef USE_LIBXML
     963             :     xmlDocPtr   doc;
     964             : 
     965         138 :     doc = xml_parse(data, xmloption_arg, preserve_whitespace,
     966             :                     GetDatabaseEncoding(), NULL, NULL, NULL);
     967          90 :     xmlFreeDoc(doc);
     968             : 
     969          90 :     return (xmltype *) data;
     970             : #else
     971             :     NO_XML_SUPPORT();
     972             :     return NULL;
     973             : #endif
     974             : }
     975             : 
     976             : 
     977             : xmltype *
     978          72 : xmlpi(const char *target, text *arg, bool arg_is_null, bool *result_is_null)
     979             : {
     980             : #ifdef USE_LIBXML
     981             :     xmltype    *result;
     982             :     StringInfoData buf;
     983             : 
     984          72 :     if (pg_strcasecmp(target, "xml") == 0)
     985          12 :         ereport(ERROR,
     986             :                 (errcode(ERRCODE_SYNTAX_ERROR), /* really */
     987             :                  errmsg("invalid XML processing instruction"),
     988             :                  errdetail("XML processing instruction target name cannot be \"%s\".", target)));
     989             : 
     990             :     /*
     991             :      * Following the SQL standard, the null check comes after the syntax check
     992             :      * above.
     993             :      */
     994          60 :     *result_is_null = arg_is_null;
     995          60 :     if (*result_is_null)
     996          12 :         return NULL;
     997             : 
     998          48 :     initStringInfo(&buf);
     999             : 
    1000          48 :     appendStringInfo(&buf, "<?%s", target);
    1001             : 
    1002          48 :     if (arg != NULL)
    1003             :     {
    1004             :         char       *string;
    1005             : 
    1006          24 :         string = text_to_cstring(arg);
    1007          24 :         if (strstr(string, "?>") != NULL)
    1008           6 :             ereport(ERROR,
    1009             :                     (errcode(ERRCODE_INVALID_XML_PROCESSING_INSTRUCTION),
    1010             :                      errmsg("invalid XML processing instruction"),
    1011             :                      errdetail("XML processing instruction cannot contain \"?>\".")));
    1012             : 
    1013          18 :         appendStringInfoChar(&buf, ' ');
    1014          18 :         appendStringInfoString(&buf, string + strspn(string, " "));
    1015          18 :         pfree(string);
    1016             :     }
    1017          42 :     appendStringInfoString(&buf, "?>");
    1018             : 
    1019          42 :     result = stringinfo_to_xmltype(&buf);
    1020          42 :     pfree(buf.data);
    1021          42 :     return result;
    1022             : #else
    1023             :     NO_XML_SUPPORT();
    1024             :     return NULL;
    1025             : #endif
    1026             : }
    1027             : 
    1028             : 
    1029             : xmltype *
    1030          60 : xmlroot(xmltype *data, text *version, int standalone)
    1031             : {
    1032             : #ifdef USE_LIBXML
    1033             :     char       *str;
    1034             :     size_t      len;
    1035             :     xmlChar    *orig_version;
    1036             :     int         orig_standalone;
    1037             :     StringInfoData buf;
    1038             : 
    1039          60 :     len = VARSIZE(data) - VARHDRSZ;
    1040          60 :     str = text_to_cstring((text *) data);
    1041             : 
    1042          60 :     parse_xml_decl((xmlChar *) str, &len, &orig_version, NULL, &orig_standalone);
    1043             : 
    1044          60 :     if (version)
    1045          24 :         orig_version = xml_text2xmlChar(version);
    1046             :     else
    1047          36 :         orig_version = NULL;
    1048             : 
    1049          60 :     switch (standalone)
    1050             :     {
    1051          18 :         case XML_STANDALONE_YES:
    1052          18 :             orig_standalone = 1;
    1053          18 :             break;
    1054          12 :         case XML_STANDALONE_NO:
    1055          12 :             orig_standalone = 0;
    1056          12 :             break;
    1057          12 :         case XML_STANDALONE_NO_VALUE:
    1058          12 :             orig_standalone = -1;
    1059          12 :             break;
    1060          18 :         case XML_STANDALONE_OMITTED:
    1061             :             /* leave original value */
    1062          18 :             break;
    1063             :     }
    1064             : 
    1065          60 :     initStringInfo(&buf);
    1066          60 :     print_xml_decl(&buf, orig_version, 0, orig_standalone);
    1067          60 :     appendStringInfoString(&buf, str + len);
    1068             : 
    1069          60 :     return stringinfo_to_xmltype(&buf);
    1070             : #else
    1071             :     NO_XML_SUPPORT();
    1072             :     return NULL;
    1073             : #endif
    1074             : }
    1075             : 
    1076             : 
    1077             : /*
    1078             :  * Validate document (given as string) against DTD (given as external link)
    1079             :  *
    1080             :  * This has been removed because it is a security hole: unprivileged users
    1081             :  * should not be able to use Postgres to fetch arbitrary external files,
    1082             :  * which unfortunately is exactly what libxml is willing to do with the DTD
    1083             :  * parameter.
    1084             :  */
    1085             : Datum
    1086           0 : xmlvalidate(PG_FUNCTION_ARGS)
    1087             : {
    1088           0 :     ereport(ERROR,
    1089             :             (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
    1090             :              errmsg("xmlvalidate is not implemented")));
    1091             :     return 0;
    1092             : }
    1093             : 
    1094             : 
    1095             : bool
    1096          24 : xml_is_document(xmltype *arg)
    1097             : {
    1098             : #ifdef USE_LIBXML
    1099             :     xmlDocPtr   doc;
    1100          24 :     ErrorSaveContext escontext = {T_ErrorSaveContext};
    1101             : 
    1102             :     /*
    1103             :      * We'll report "true" if no soft error is reported by xml_parse().
    1104             :      */
    1105          24 :     doc = xml_parse((text *) arg, XMLOPTION_DOCUMENT, true,
    1106             :                     GetDatabaseEncoding(), NULL, NULL, (Node *) &escontext);
    1107          24 :     if (doc)
    1108          12 :         xmlFreeDoc(doc);
    1109             : 
    1110          24 :     return !escontext.error_occurred;
    1111             : #else                           /* not USE_LIBXML */
    1112             :     NO_XML_SUPPORT();
    1113             :     return false;
    1114             : #endif                          /* not USE_LIBXML */
    1115             : }
    1116             : 
    1117             : 
    1118             : #ifdef USE_LIBXML
    1119             : 
    1120             : /*
    1121             :  * pg_xml_init_library --- set up for use of libxml
    1122             :  *
    1123             :  * This should be called by each function that is about to use libxml
    1124             :  * facilities but doesn't require error handling.  It initializes libxml
    1125             :  * and verifies compatibility with the loaded libxml version.  These are
    1126             :  * once-per-session activities.
    1127             :  *
    1128             :  * TODO: xmlChar is utf8-char, make proper tuning (initdb with enc!=utf8 and
    1129             :  * check)
    1130             :  */
    1131             : void
    1132       91454 : pg_xml_init_library(void)
    1133             : {
    1134             :     static bool first_time = true;
    1135             : 
    1136       91454 :     if (first_time)
    1137             :     {
    1138             :         /* Stuff we need do only once per session */
    1139             : 
    1140             :         /*
    1141             :          * Currently, we have no pure UTF-8 support for internals -- check if
    1142             :          * we can work.
    1143             :          */
    1144             :         if (sizeof(char) != sizeof(xmlChar))
    1145             :             ereport(ERROR,
    1146             :                     (errmsg("could not initialize XML library"),
    1147             :                      errdetail("libxml2 has incompatible char type: sizeof(char)=%zu, sizeof(xmlChar)=%zu.",
    1148             :                                sizeof(char), sizeof(xmlChar))));
    1149             : 
    1150             : #ifdef USE_LIBXMLCONTEXT
    1151             :         /* Set up libxml's memory allocation our way */
    1152             :         xml_memory_init();
    1153             : #endif
    1154             : 
    1155             :         /* Check library compatibility */
    1156          26 :         LIBXML_TEST_VERSION;
    1157             : 
    1158          26 :         first_time = false;
    1159             :     }
    1160       91454 : }
    1161             : 
    1162             : /*
    1163             :  * pg_xml_init --- set up for use of libxml and register an error handler
    1164             :  *
    1165             :  * This should be called by each function that is about to use libxml
    1166             :  * facilities and requires error handling.  It initializes libxml with
    1167             :  * pg_xml_init_library() and establishes our libxml error handler.
    1168             :  *
    1169             :  * strictness determines which errors are reported and which are ignored.
    1170             :  *
    1171             :  * Calls to this function MUST be followed by a PG_TRY block that guarantees
    1172             :  * that pg_xml_done() is called during either normal or error exit.
    1173             :  *
    1174             :  * This is exported for use by contrib/xml2, as well as other code that might
    1175             :  * wish to share use of this module's libxml error handler.
    1176             :  */
    1177             : PgXmlErrorContext *
    1178       23866 : pg_xml_init(PgXmlStrictness strictness)
    1179             : {
    1180             :     PgXmlErrorContext *errcxt;
    1181             :     void       *new_errcxt;
    1182             : 
    1183             :     /* Do one-time setup if needed */
    1184       23866 :     pg_xml_init_library();
    1185             : 
    1186             :     /* Create error handling context structure */
    1187       23866 :     errcxt = (PgXmlErrorContext *) palloc(sizeof(PgXmlErrorContext));
    1188       23866 :     errcxt->magic = ERRCXT_MAGIC;
    1189       23866 :     errcxt->strictness = strictness;
    1190       23866 :     errcxt->err_occurred = false;
    1191       23866 :     initStringInfo(&errcxt->err_buf);
    1192             : 
    1193             :     /*
    1194             :      * Save original error handler and install ours. libxml originally didn't
    1195             :      * distinguish between the contexts for generic and for structured error
    1196             :      * handlers.  If we're using an old libxml version, we must thus save the
    1197             :      * generic error context, even though we're using a structured error
    1198             :      * handler.
    1199             :      */
    1200       23866 :     errcxt->saved_errfunc = xmlStructuredError;
    1201             : 
    1202             : #ifdef HAVE_XMLSTRUCTUREDERRORCONTEXT
    1203       23866 :     errcxt->saved_errcxt = xmlStructuredErrorContext;
    1204             : #else
    1205             :     errcxt->saved_errcxt = xmlGenericErrorContext;
    1206             : #endif
    1207             : 
    1208       23866 :     xmlSetStructuredErrorFunc((void *) errcxt, xml_errorHandler);
    1209             : 
    1210             :     /*
    1211             :      * Verify that xmlSetStructuredErrorFunc set the context variable we
    1212             :      * expected it to.  If not, the error context pointer we just saved is not
    1213             :      * the correct thing to restore, and since that leaves us without a way to
    1214             :      * restore the context in pg_xml_done, we must fail.
    1215             :      *
    1216             :      * The only known situation in which this test fails is if we compile with
    1217             :      * headers from a libxml2 that doesn't track the structured error context
    1218             :      * separately (< 2.7.4), but at runtime use a version that does, or vice
    1219             :      * versa.  The libxml2 authors did not treat that change as constituting
    1220             :      * an ABI break, so the LIBXML_TEST_VERSION test in pg_xml_init_library
    1221             :      * fails to protect us from this.
    1222             :      */
    1223             : 
    1224             : #ifdef HAVE_XMLSTRUCTUREDERRORCONTEXT
    1225       23866 :     new_errcxt = xmlStructuredErrorContext;
    1226             : #else
    1227             :     new_errcxt = xmlGenericErrorContext;
    1228             : #endif
    1229             : 
    1230       23866 :     if (new_errcxt != (void *) errcxt)
    1231           0 :         ereport(ERROR,
    1232             :                 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
    1233             :                  errmsg("could not set up XML error handler"),
    1234             :                  errhint("This probably indicates that the version of libxml2"
    1235             :                          " being used is not compatible with the libxml2"
    1236             :                          " header files that PostgreSQL was built with.")));
    1237             : 
    1238             :     /*
    1239             :      * Also, install an entity loader to prevent unwanted fetches of external
    1240             :      * files and URLs.
    1241             :      */
    1242       23866 :     errcxt->saved_entityfunc = xmlGetExternalEntityLoader();
    1243       23866 :     xmlSetExternalEntityLoader(xmlPgEntityLoader);
    1244             : 
    1245       23866 :     return errcxt;
    1246             : }
    1247             : 
    1248             : 
    1249             : /*
    1250             :  * pg_xml_done --- restore previous libxml error handling
    1251             :  *
    1252             :  * Resets libxml's global error-handling state to what it was before
    1253             :  * pg_xml_init() was called.
    1254             :  *
    1255             :  * This routine verifies that all pending errors have been dealt with
    1256             :  * (in assert-enabled builds, anyway).
    1257             :  */
    1258             : void
    1259       23866 : pg_xml_done(PgXmlErrorContext *errcxt, bool isError)
    1260             : {
    1261             :     void       *cur_errcxt;
    1262             : 
    1263             :     /* An assert seems like enough protection here */
    1264             :     Assert(errcxt->magic == ERRCXT_MAGIC);
    1265             : 
    1266             :     /*
    1267             :      * In a normal exit, there should be no un-handled libxml errors.  But we
    1268             :      * shouldn't try to enforce this during error recovery, since the longjmp
    1269             :      * could have been thrown before xml_ereport had a chance to run.
    1270             :      */
    1271             :     Assert(!errcxt->err_occurred || isError);
    1272             : 
    1273             :     /*
    1274             :      * Check that libxml's global state is correct, warn if not.  This is a
    1275             :      * real test and not an Assert because it has a higher probability of
    1276             :      * happening.
    1277             :      */
    1278             : #ifdef HAVE_XMLSTRUCTUREDERRORCONTEXT
    1279       23866 :     cur_errcxt = xmlStructuredErrorContext;
    1280             : #else
    1281             :     cur_errcxt = xmlGenericErrorContext;
    1282             : #endif
    1283             : 
    1284       23866 :     if (cur_errcxt != (void *) errcxt)
    1285           0 :         elog(WARNING, "libxml error handling state is out of sync with xml.c");
    1286             : 
    1287             :     /* Restore the saved handlers */
    1288       23866 :     xmlSetStructuredErrorFunc(errcxt->saved_errcxt, errcxt->saved_errfunc);
    1289       23866 :     xmlSetExternalEntityLoader(errcxt->saved_entityfunc);
    1290             : 
    1291             :     /*
    1292             :      * Mark the struct as invalid, just in case somebody somehow manages to
    1293             :      * call xml_errorHandler or xml_ereport with it.
    1294             :      */
    1295       23866 :     errcxt->magic = 0;
    1296             : 
    1297             :     /* Release memory */
    1298       23866 :     pfree(errcxt->err_buf.data);
    1299       23866 :     pfree(errcxt);
    1300       23866 : }
    1301             : 
    1302             : 
    1303             : /*
    1304             :  * pg_xml_error_occurred() --- test the error flag
    1305             :  */
    1306             : bool
    1307           0 : pg_xml_error_occurred(PgXmlErrorContext *errcxt)
    1308             : {
    1309           0 :     return errcxt->err_occurred;
    1310             : }
    1311             : 
    1312             : 
    1313             : /*
    1314             :  * SQL/XML allows storing "XML documents" or "XML content".  "XML
    1315             :  * documents" are specified by the XML specification and are parsed
    1316             :  * easily by libxml.  "XML content" is specified by SQL/XML as the
    1317             :  * production "XMLDecl? content".  But libxml can only parse the
    1318             :  * "content" part, so we have to parse the XML declaration ourselves
    1319             :  * to complete this.
    1320             :  */
    1321             : 
    1322             : #define CHECK_XML_SPACE(p) \
    1323             :     do { \
    1324             :         if (!xmlIsBlank_ch(*(p))) \
    1325             :             return XML_ERR_SPACE_REQUIRED; \
    1326             :     } while (0)
    1327             : 
    1328             : #define SKIP_XML_SPACE(p) \
    1329             :     while (xmlIsBlank_ch(*(p))) (p)++
    1330             : 
    1331             : /* Letter | Digit | '.' | '-' | '_' | ':' | CombiningChar | Extender */
    1332             : /* Beware of multiple evaluations of argument! */
    1333             : #define PG_XMLISNAMECHAR(c) \
    1334             :     (xmlIsBaseChar_ch(c) || xmlIsIdeographicQ(c) \
    1335             :             || xmlIsDigit_ch(c) \
    1336             :             || c == '.' || c == '-' || c == '_' || c == ':' \
    1337             :             || xmlIsCombiningQ(c) \
    1338             :             || xmlIsExtender_ch(c))
    1339             : 
    1340             : /* pnstrdup, but deal with xmlChar not char; len is measured in xmlChars */
    1341             : static xmlChar *
    1342         192 : xml_pnstrdup(const xmlChar *str, size_t len)
    1343             : {
    1344             :     xmlChar    *result;
    1345             : 
    1346         192 :     result = (xmlChar *) palloc((len + 1) * sizeof(xmlChar));
    1347         192 :     memcpy(result, str, len * sizeof(xmlChar));
    1348         192 :     result[len] = 0;
    1349         192 :     return result;
    1350             : }
    1351             : 
    1352             : /* Ditto, except input is char* */
    1353             : static xmlChar *
    1354        2424 : pg_xmlCharStrndup(const char *str, size_t len)
    1355             : {
    1356             :     xmlChar    *result;
    1357             : 
    1358        2424 :     result = (xmlChar *) palloc((len + 1) * sizeof(xmlChar));
    1359        2424 :     memcpy(result, str, len);
    1360        2424 :     result[len] = '\0';
    1361             : 
    1362        2424 :     return result;
    1363             : }
    1364             : 
    1365             : /*
    1366             :  * Copy xmlChar string to PostgreSQL-owned memory, freeing the input.
    1367             :  *
    1368             :  * The input xmlChar is freed regardless of success of the copy.
    1369             :  */
    1370             : static char *
    1371      108880 : xml_pstrdup_and_free(xmlChar *str)
    1372             : {
    1373             :     char       *result;
    1374             : 
    1375      108880 :     if (str)
    1376             :     {
    1377      108880 :         PG_TRY();
    1378             :         {
    1379      108880 :             result = pstrdup((char *) str);
    1380             :         }
    1381           0 :         PG_FINALLY();
    1382             :         {
    1383      108880 :             xmlFree(str);
    1384             :         }
    1385      108880 :         PG_END_TRY();
    1386             :     }
    1387             :     else
    1388           0 :         result = NULL;
    1389             : 
    1390      108880 :     return result;
    1391             : }
    1392             : 
    1393             : /*
    1394             :  * str is the null-terminated input string.  Remaining arguments are
    1395             :  * output arguments; each can be NULL if value is not wanted.
    1396             :  * version and encoding are returned as locally-palloc'd strings.
    1397             :  * Result is 0 if OK, an error code if not.
    1398             :  */
    1399             : static int
    1400       67588 : parse_xml_decl(const xmlChar *str, size_t *lenp,
    1401             :                xmlChar **version, xmlChar **encoding, int *standalone)
    1402             : {
    1403             :     const xmlChar *p;
    1404             :     const xmlChar *save_p;
    1405             :     size_t      len;
    1406             :     int         utf8char;
    1407             :     int         utf8len;
    1408             : 
    1409             :     /*
    1410             :      * Only initialize libxml.  We don't need error handling here, but we do
    1411             :      * need to make sure libxml is initialized before calling any of its
    1412             :      * functions.  Note that this is safe (and a no-op) if caller has already
    1413             :      * done pg_xml_init().
    1414             :      */
    1415       67588 :     pg_xml_init_library();
    1416             : 
    1417             :     /* Initialize output arguments to "not present" */
    1418       67588 :     if (version)
    1419       66952 :         *version = NULL;
    1420       67588 :     if (encoding)
    1421           0 :         *encoding = NULL;
    1422       67588 :     if (standalone)
    1423       66952 :         *standalone = -1;
    1424             : 
    1425       67588 :     p = str;
    1426             : 
    1427       67588 :     if (xmlStrncmp(p, (xmlChar *) "<?xml", 5) != 0)
    1428       67366 :         goto finished;
    1429             : 
    1430             :     /*
    1431             :      * If next char is a name char, it's a PI like <?xml-stylesheet ...?>
    1432             :      * rather than an XMLDecl, so we have done what we came to do and found no
    1433             :      * XMLDecl.
    1434             :      *
    1435             :      * We need an input length value for xmlGetUTF8Char, but there's no need
    1436             :      * to count the whole document size, so use strnlen not strlen.
    1437             :      */
    1438         222 :     utf8len = strnlen((const char *) (p + 5), MAX_MULTIBYTE_CHAR_LEN);
    1439         222 :     utf8char = xmlGetUTF8Char(p + 5, &utf8len);
    1440         222 :     if (PG_XMLISNAMECHAR(utf8char))
    1441          12 :         goto finished;
    1442             : 
    1443         210 :     p += 5;
    1444             : 
    1445             :     /* version */
    1446         210 :     CHECK_XML_SPACE(p);
    1447         420 :     SKIP_XML_SPACE(p);
    1448         210 :     if (xmlStrncmp(p, (xmlChar *) "version", 7) != 0)
    1449           0 :         return XML_ERR_VERSION_MISSING;
    1450         210 :     p += 7;
    1451         210 :     SKIP_XML_SPACE(p);
    1452         210 :     if (*p != '=')
    1453           0 :         return XML_ERR_VERSION_MISSING;
    1454         210 :     p += 1;
    1455         210 :     SKIP_XML_SPACE(p);
    1456             : 
    1457         210 :     if (*p == '\'' || *p == '"')
    1458         210 :     {
    1459             :         const xmlChar *q;
    1460             : 
    1461         210 :         q = xmlStrchr(p + 1, *p);
    1462         210 :         if (!q)
    1463           0 :             return XML_ERR_VERSION_MISSING;
    1464             : 
    1465         210 :         if (version)
    1466         192 :             *version = xml_pnstrdup(p + 1, q - p - 1);
    1467         210 :         p = q + 1;
    1468             :     }
    1469             :     else
    1470           0 :         return XML_ERR_VERSION_MISSING;
    1471             : 
    1472             :     /* encoding */
    1473         210 :     save_p = p;
    1474         372 :     SKIP_XML_SPACE(p);
    1475         210 :     if (xmlStrncmp(p, (xmlChar *) "encoding", 8) == 0)
    1476             :     {
    1477          54 :         CHECK_XML_SPACE(save_p);
    1478          54 :         p += 8;
    1479          54 :         SKIP_XML_SPACE(p);
    1480          54 :         if (*p != '=')
    1481           0 :             return XML_ERR_MISSING_ENCODING;
    1482          54 :         p += 1;
    1483          54 :         SKIP_XML_SPACE(p);
    1484             : 
    1485          54 :         if (*p == '\'' || *p == '"')
    1486          54 :         {
    1487             :             const xmlChar *q;
    1488             : 
    1489          54 :             q = xmlStrchr(p + 1, *p);
    1490          54 :             if (!q)
    1491           0 :                 return XML_ERR_MISSING_ENCODING;
    1492             : 
    1493          54 :             if (encoding)
    1494           0 :                 *encoding = xml_pnstrdup(p + 1, q - p - 1);
    1495          54 :             p = q + 1;
    1496             :         }
    1497             :         else
    1498           0 :             return XML_ERR_MISSING_ENCODING;
    1499             :     }
    1500             :     else
    1501             :     {
    1502         156 :         p = save_p;
    1503             :     }
    1504             : 
    1505             :     /* standalone */
    1506         210 :     save_p = p;
    1507         318 :     SKIP_XML_SPACE(p);
    1508         210 :     if (xmlStrncmp(p, (xmlChar *) "standalone", 10) == 0)
    1509             :     {
    1510         108 :         CHECK_XML_SPACE(save_p);
    1511         108 :         p += 10;
    1512         108 :         SKIP_XML_SPACE(p);
    1513         108 :         if (*p != '=')
    1514           0 :             return XML_ERR_STANDALONE_VALUE;
    1515         108 :         p += 1;
    1516         108 :         SKIP_XML_SPACE(p);
    1517         216 :         if (xmlStrncmp(p, (xmlChar *) "'yes'", 5) == 0 ||
    1518         108 :             xmlStrncmp(p, (xmlChar *) "\"yes\"", 5) == 0)
    1519             :         {
    1520          60 :             if (standalone)
    1521          60 :                 *standalone = 1;
    1522          60 :             p += 5;
    1523             :         }
    1524          96 :         else if (xmlStrncmp(p, (xmlChar *) "'no'", 4) == 0 ||
    1525          48 :                  xmlStrncmp(p, (xmlChar *) "\"no\"", 4) == 0)
    1526             :         {
    1527          36 :             if (standalone)
    1528          36 :                 *standalone = 0;
    1529          36 :             p += 4;
    1530             :         }
    1531             :         else
    1532          12 :             return XML_ERR_STANDALONE_VALUE;
    1533             :     }
    1534             :     else
    1535             :     {
    1536         102 :         p = save_p;
    1537             :     }
    1538             : 
    1539         198 :     SKIP_XML_SPACE(p);
    1540         198 :     if (xmlStrncmp(p, (xmlChar *) "?>", 2) != 0)
    1541           0 :         return XML_ERR_XMLDECL_NOT_FINISHED;
    1542         198 :     p += 2;
    1543             : 
    1544       67576 : finished:
    1545       67576 :     len = p - str;
    1546             : 
    1547       74308 :     for (p = str; p < str + len; p++)
    1548        6732 :         if (*p > 127)
    1549           0 :             return XML_ERR_INVALID_CHAR;
    1550             : 
    1551       67576 :     if (lenp)
    1552       67576 :         *lenp = len;
    1553             : 
    1554       67576 :     return XML_ERR_OK;
    1555             : }
    1556             : 
    1557             : 
    1558             : /*
    1559             :  * Write an XML declaration.  On output, we adjust the XML declaration
    1560             :  * as follows.  (These rules are the moral equivalent of the clause
    1561             :  * "Serialization of an XML value" in the SQL standard.)
    1562             :  *
    1563             :  * We try to avoid generating an XML declaration if possible.  This is
    1564             :  * so that you don't get trivial things like xml '<foo/>' resulting in
    1565             :  * '<?xml version="1.0"?><foo/>', which would surely be annoying.  We
    1566             :  * must provide a declaration if the standalone property is specified
    1567             :  * or if we include an encoding declaration.  If we have a
    1568             :  * declaration, we must specify a version (XML requires this).
    1569             :  * Otherwise we only make a declaration if the version is not "1.0",
    1570             :  * which is the default version specified in SQL:2003.
    1571             :  */
    1572             : static bool
    1573       22892 : print_xml_decl(StringInfo buf, const xmlChar *version,
    1574             :                pg_enc encoding, int standalone)
    1575             : {
    1576       22892 :     if ((version && strcmp((const char *) version, PG_XML_DEFAULT_VERSION) != 0)
    1577       22856 :         || (encoding && encoding != PG_UTF8)
    1578       22856 :         || standalone != -1)
    1579             :     {
    1580          96 :         appendStringInfoString(buf, "<?xml");
    1581             : 
    1582          96 :         if (version)
    1583          72 :             appendStringInfo(buf, " version=\"%s\"", version);
    1584             :         else
    1585          24 :             appendStringInfo(buf, " version=\"%s\"", PG_XML_DEFAULT_VERSION);
    1586             : 
    1587          96 :         if (encoding && encoding != PG_UTF8)
    1588             :         {
    1589             :             /*
    1590             :              * XXX might be useful to convert this to IANA names (ISO-8859-1
    1591             :              * instead of LATIN1 etc.); needs field experience
    1592             :              */
    1593           0 :             appendStringInfo(buf, " encoding=\"%s\"",
    1594             :                              pg_encoding_to_char(encoding));
    1595             :         }
    1596             : 
    1597          96 :         if (standalone == 1)
    1598          48 :             appendStringInfoString(buf, " standalone=\"yes\"");
    1599          48 :         else if (standalone == 0)
    1600          24 :             appendStringInfoString(buf, " standalone=\"no\"");
    1601          96 :         appendStringInfoString(buf, "?>");
    1602             : 
    1603          96 :         return true;
    1604             :     }
    1605             :     else
    1606       22796 :         return false;
    1607             : }
    1608             : 
    1609             : /*
    1610             :  * Test whether an input that is to be parsed as CONTENT contains a DTD.
    1611             :  *
    1612             :  * The SQL/XML:2003 definition of CONTENT ("XMLDecl? content") is not
    1613             :  * satisfied by a document with a DTD, which is a bit of a wart, as it means
    1614             :  * the CONTENT type is not a proper superset of DOCUMENT.  SQL/XML:2006 and
    1615             :  * later fix that, by redefining content with reference to the "more
    1616             :  * permissive" Document Node of the XQuery/XPath Data Model, such that any
    1617             :  * DOCUMENT value is indeed also a CONTENT value.  That definition is more
    1618             :  * useful, as CONTENT becomes usable for parsing input of unknown form (think
    1619             :  * pg_restore).
    1620             :  *
    1621             :  * As used below in parse_xml when parsing for CONTENT, libxml does not give
    1622             :  * us the 2006+ behavior, but only the 2003; it will choke if the input has
    1623             :  * a DTD.  But we can provide the 2006+ definition of CONTENT easily enough,
    1624             :  * by detecting this case first and simply doing the parse as DOCUMENT.
    1625             :  *
    1626             :  * A DTD can be found arbitrarily far in, but that would be a contrived case;
    1627             :  * it will ordinarily start within a few dozen characters.  The only things
    1628             :  * that can precede it are an XMLDecl (here, the caller will have called
    1629             :  * parse_xml_decl already), whitespace, comments, and processing instructions.
    1630             :  * This function need only return true if it sees a valid sequence of such
    1631             :  * things leading to <!DOCTYPE.  It can simply return false in any other
    1632             :  * cases, including malformed input; that will mean the input gets parsed as
    1633             :  * CONTENT as originally planned, with libxml reporting any errors.
    1634             :  *
    1635             :  * This is only to be called from xml_parse, when pg_xml_init has already
    1636             :  * been called.  The input is already in UTF8 encoding.
    1637             :  */
    1638             : static bool
    1639         936 : xml_doctype_in_content(const xmlChar *str)
    1640             : {
    1641         936 :     const xmlChar *p = str;
    1642             : 
    1643             :     for (;;)
    1644          36 :     {
    1645             :         const xmlChar *e;
    1646             : 
    1647        1062 :         SKIP_XML_SPACE(p);
    1648         972 :         if (*p != '<')
    1649         194 :             return false;
    1650         778 :         p++;
    1651             : 
    1652         778 :         if (*p == '!')
    1653             :         {
    1654          72 :             p++;
    1655             : 
    1656             :             /* if we see <!DOCTYPE, we can return true */
    1657          72 :             if (xmlStrncmp(p, (xmlChar *) "DOCTYPE", 7) == 0)
    1658          42 :                 return true;
    1659             : 
    1660             :             /* otherwise, if it's not a comment, fail */
    1661          30 :             if (xmlStrncmp(p, (xmlChar *) "--", 2) != 0)
    1662           0 :                 return false;
    1663             :             /* find end of comment: find -- and a > must follow */
    1664          30 :             p = xmlStrstr(p + 2, (xmlChar *) "--");
    1665          30 :             if (!p || p[2] != '>')
    1666           0 :                 return false;
    1667             :             /* advance over comment, and keep scanning */
    1668          30 :             p += 3;
    1669          30 :             continue;
    1670             :         }
    1671             : 
    1672             :         /* otherwise, if it's not a PI <?target something?>, fail */
    1673         706 :         if (*p != '?')
    1674         700 :             return false;
    1675           6 :         p++;
    1676             : 
    1677             :         /* find end of PI (the string ?> is forbidden within a PI) */
    1678           6 :         e = xmlStrstr(p, (xmlChar *) "?>");
    1679           6 :         if (!e)
    1680           0 :             return false;
    1681             : 
    1682             :         /* advance over PI, keep scanning */
    1683           6 :         p = e + 2;
    1684             :     }
    1685             : }
    1686             : 
    1687             : 
    1688             : /*
    1689             :  * Convert a text object to XML internal representation
    1690             :  *
    1691             :  * data is the source data (must not be toasted!), encoding is its encoding,
    1692             :  * and xmloption_arg and preserve_whitespace are options for the
    1693             :  * transformation.
    1694             :  *
    1695             :  * If parsed_xmloptiontype isn't NULL, *parsed_xmloptiontype is set to the
    1696             :  * XmlOptionType actually used to parse the input (typically the same as
    1697             :  * xmloption_arg, but a DOCTYPE node in the input can force DOCUMENT mode).
    1698             :  *
    1699             :  * If parsed_nodes isn't NULL and the input is not an XML document, the list
    1700             :  * of parsed nodes from the xmlParseBalancedChunkMemory call will be returned
    1701             :  * to *parsed_nodes.
    1702             :  *
    1703             :  * Errors normally result in ereport(ERROR), but if escontext is an
    1704             :  * ErrorSaveContext, then "safe" errors are reported there instead, and the
    1705             :  * caller must check SOFT_ERROR_OCCURRED() to see whether that happened.
    1706             :  *
    1707             :  * Note: it is caller's responsibility to xmlFreeDoc() the result,
    1708             :  * else a permanent memory leak will ensue!  But note the result could
    1709             :  * be NULL after a soft error.
    1710             :  *
    1711             :  * TODO maybe libxml2's xmlreader is better? (do not construct DOM,
    1712             :  * yet do not use SAX - see xmlreader.c)
    1713             :  */
    1714             : static xmlDocPtr
    1715        1236 : xml_parse(text *data, XmlOptionType xmloption_arg,
    1716             :           bool preserve_whitespace, int encoding,
    1717             :           XmlOptionType *parsed_xmloptiontype, xmlNodePtr *parsed_nodes,
    1718             :           Node *escontext)
    1719             : {
    1720             :     int32       len;
    1721             :     xmlChar    *string;
    1722             :     xmlChar    *utf8string;
    1723             :     PgXmlErrorContext *xmlerrcxt;
    1724        1236 :     volatile xmlParserCtxtPtr ctxt = NULL;
    1725        1236 :     volatile xmlDocPtr doc = NULL;
    1726             : 
    1727             :     /*
    1728             :      * This step looks annoyingly redundant, but we must do it to have a
    1729             :      * null-terminated string in case encoding conversion isn't required.
    1730             :      */
    1731        1236 :     len = VARSIZE_ANY_EXHDR(data);  /* will be useful later */
    1732        1236 :     string = xml_text2xmlChar(data);
    1733             : 
    1734             :     /*
    1735             :      * If the data isn't UTF8, we must translate before giving it to libxml.
    1736             :      *
    1737             :      * XXX ideally, we'd catch any encoding conversion failure and return a
    1738             :      * soft error.  However, failure to convert to UTF8 should be pretty darn
    1739             :      * rare, so for now this is left undone.
    1740             :      */
    1741        1236 :     utf8string = pg_do_encoding_conversion(string,
    1742             :                                            len,
    1743             :                                            encoding,
    1744             :                                            PG_UTF8);
    1745             : 
    1746             :     /* Start up libxml and its parser */
    1747        1236 :     xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_WELLFORMED);
    1748             : 
    1749             :     /* Use a TRY block to ensure we clean up correctly */
    1750        1236 :     PG_TRY();
    1751             :     {
    1752        1236 :         bool        parse_as_document = false;
    1753             :         int         res_code;
    1754        1236 :         size_t      count = 0;
    1755        1236 :         xmlChar    *version = NULL;
    1756        1236 :         int         standalone = 0;
    1757             : 
    1758             :         /* Any errors here are reported as hard ereport's */
    1759        1236 :         xmlInitParser();
    1760             : 
    1761        1236 :         ctxt = xmlNewParserCtxt();
    1762        1236 :         if (ctxt == NULL || xmlerrcxt->err_occurred)
    1763           0 :             xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
    1764             :                         "could not allocate parser context");
    1765             : 
    1766             :         /* Decide whether to parse as document or content */
    1767        1236 :         if (xmloption_arg == XMLOPTION_DOCUMENT)
    1768         288 :             parse_as_document = true;
    1769             :         else
    1770             :         {
    1771             :             /* Parse and skip over the XML declaration, if any */
    1772         948 :             res_code = parse_xml_decl(utf8string,
    1773             :                                       &count, &version, NULL, &standalone);
    1774         948 :             if (res_code != 0)
    1775             :             {
    1776          12 :                 errsave(escontext,
    1777             :                         errcode(ERRCODE_INVALID_XML_CONTENT),
    1778             :                         errmsg_internal("invalid XML content: invalid XML declaration"),
    1779             :                         errdetail_for_xml_code(res_code));
    1780          12 :                 goto fail;
    1781             :             }
    1782             : 
    1783             :             /* Is there a DOCTYPE element? */
    1784         936 :             if (xml_doctype_in_content(utf8string + count))
    1785          42 :                 parse_as_document = true;
    1786             :         }
    1787             : 
    1788             :         /* initialize output parameters */
    1789        1224 :         if (parsed_xmloptiontype != NULL)
    1790         132 :             *parsed_xmloptiontype = parse_as_document ? XMLOPTION_DOCUMENT :
    1791             :                 XMLOPTION_CONTENT;
    1792        1224 :         if (parsed_nodes != NULL)
    1793         132 :             *parsed_nodes = NULL;
    1794             : 
    1795        1224 :         if (parse_as_document)
    1796             :         {
    1797             :             /*
    1798             :              * Note, that here we try to apply DTD defaults
    1799             :              * (XML_PARSE_DTDATTR) according to SQL/XML:2008 GR 10.16.7.d:
    1800             :              * 'Default values defined by internal DTD are applied'. As for
    1801             :              * external DTDs, we try to support them too, (see SQL/XML:2008 GR
    1802             :              * 10.16.7.e)
    1803             :              */
    1804         330 :             doc = xmlCtxtReadDoc(ctxt, utf8string,
    1805             :                                  NULL,
    1806             :                                  "UTF-8",
    1807             :                                  XML_PARSE_NOENT | XML_PARSE_DTDATTR
    1808             :                                  | (preserve_whitespace ? 0 : XML_PARSE_NOBLANKS));
    1809         330 :             if (doc == NULL || xmlerrcxt->err_occurred)
    1810             :             {
    1811             :                 /* Use original option to decide which error code to report */
    1812         144 :                 if (xmloption_arg == XMLOPTION_DOCUMENT)
    1813         138 :                     xml_errsave(escontext, xmlerrcxt,
    1814             :                                 ERRCODE_INVALID_XML_DOCUMENT,
    1815             :                                 "invalid XML document");
    1816             :                 else
    1817           6 :                     xml_errsave(escontext, xmlerrcxt,
    1818             :                                 ERRCODE_INVALID_XML_CONTENT,
    1819             :                                 "invalid XML content");
    1820          96 :                 goto fail;
    1821             :             }
    1822             :         }
    1823             :         else
    1824             :         {
    1825         894 :             doc = xmlNewDoc(version);
    1826         894 :             if (doc == NULL || xmlerrcxt->err_occurred)
    1827           0 :                 xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
    1828             :                             "could not allocate XML document");
    1829             : 
    1830             :             Assert(doc->encoding == NULL);
    1831         894 :             doc->encoding = xmlStrdup((const xmlChar *) "UTF-8");
    1832         894 :             if (doc->encoding == NULL || xmlerrcxt->err_occurred)
    1833           0 :                 xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
    1834             :                             "could not allocate XML document");
    1835         894 :             doc->standalone = standalone;
    1836             : 
    1837             :             /* allow empty content */
    1838         894 :             if (*(utf8string + count))
    1839             :             {
    1840        1740 :                 res_code = xmlParseBalancedChunkMemory(doc, NULL, NULL, 0,
    1841         870 :                                                        utf8string + count,
    1842             :                                                        parsed_nodes);
    1843         870 :                 if (res_code != 0 || xmlerrcxt->err_occurred)
    1844             :                 {
    1845          60 :                     xml_errsave(escontext, xmlerrcxt,
    1846             :                                 ERRCODE_INVALID_XML_CONTENT,
    1847             :                                 "invalid XML content");
    1848          12 :                     goto fail;
    1849             :                 }
    1850             :             }
    1851             :         }
    1852             : 
    1853        1140 : fail:
    1854             :         ;
    1855             :     }
    1856          96 :     PG_CATCH();
    1857             :     {
    1858          96 :         if (doc != NULL)
    1859          48 :             xmlFreeDoc(doc);
    1860          96 :         if (ctxt != NULL)
    1861          96 :             xmlFreeParserCtxt(ctxt);
    1862             : 
    1863          96 :         pg_xml_done(xmlerrcxt, true);
    1864             : 
    1865          96 :         PG_RE_THROW();
    1866             :     }
    1867        1140 :     PG_END_TRY();
    1868             : 
    1869        1140 :     xmlFreeParserCtxt(ctxt);
    1870             : 
    1871        1140 :     pg_xml_done(xmlerrcxt, false);
    1872             : 
    1873        1140 :     return doc;
    1874             : }
    1875             : 
    1876             : 
    1877             : /*
    1878             :  * xmlChar<->text conversions
    1879             :  */
    1880             : static xmlChar *
    1881        1374 : xml_text2xmlChar(text *in)
    1882             : {
    1883        1374 :     return (xmlChar *) text_to_cstring(in);
    1884             : }
    1885             : 
    1886             : 
    1887             : #ifdef USE_LIBXMLCONTEXT
    1888             : 
    1889             : /*
    1890             :  * Manage the special context used for all libxml allocations (but only
    1891             :  * in special debug builds; see notes at top of file)
    1892             :  */
    1893             : static void
    1894             : xml_memory_init(void)
    1895             : {
    1896             :     /* Create memory context if not there already */
    1897             :     if (LibxmlContext == NULL)
    1898             :         LibxmlContext = AllocSetContextCreate(TopMemoryContext,
    1899             :                                               "Libxml context",
    1900             :                                               ALLOCSET_DEFAULT_SIZES);
    1901             : 
    1902             :     /* Re-establish the callbacks even if already set */
    1903             :     xmlMemSetup(xml_pfree, xml_palloc, xml_repalloc, xml_pstrdup);
    1904             : }
    1905             : 
    1906             : /*
    1907             :  * Wrappers for memory management functions
    1908             :  */
    1909             : static void *
    1910             : xml_palloc(size_t size)
    1911             : {
    1912             :     return MemoryContextAlloc(LibxmlContext, size);
    1913             : }
    1914             : 
    1915             : 
    1916             : static void *
    1917             : xml_repalloc(void *ptr, size_t size)
    1918             : {
    1919             :     return repalloc(ptr, size);
    1920             : }
    1921             : 
    1922             : 
    1923             : static void
    1924             : xml_pfree(void *ptr)
    1925             : {
    1926             :     /* At least some parts of libxml assume xmlFree(NULL) is allowed */
    1927             :     if (ptr)
    1928             :         pfree(ptr);
    1929             : }
    1930             : 
    1931             : 
    1932             : static char *
    1933             : xml_pstrdup(const char *string)
    1934             : {
    1935             :     return MemoryContextStrdup(LibxmlContext, string);
    1936             : }
    1937             : #endif                          /* USE_LIBXMLCONTEXT */
    1938             : 
    1939             : 
    1940             : /*
    1941             :  * xmlPgEntityLoader --- entity loader callback function
    1942             :  *
    1943             :  * Silently prevent any external entity URL from being loaded.  We don't want
    1944             :  * to throw an error, so instead make the entity appear to expand to an empty
    1945             :  * string.
    1946             :  *
    1947             :  * We would prefer to allow loading entities that exist in the system's
    1948             :  * global XML catalog; but the available libxml2 APIs make that a complex
    1949             :  * and fragile task.  For now, just shut down all external access.
    1950             :  */
    1951             : static xmlParserInputPtr
    1952          30 : xmlPgEntityLoader(const char *URL, const char *ID,
    1953             :                   xmlParserCtxtPtr ctxt)
    1954             : {
    1955          30 :     return xmlNewStringInputStream(ctxt, (const xmlChar *) "");
    1956             : }
    1957             : 
    1958             : 
    1959             : /*
    1960             :  * xml_ereport --- report an XML-related error
    1961             :  *
    1962             :  * The "msg" is the SQL-level message; some can be adopted from the SQL/XML
    1963             :  * standard.  This function adds libxml's native error message, if any, as
    1964             :  * detail.
    1965             :  *
    1966             :  * This is exported for modules that want to share the core libxml error
    1967             :  * handler.  Note that pg_xml_init() *must* have been called previously.
    1968             :  */
    1969             : void
    1970          12 : xml_ereport(PgXmlErrorContext *errcxt, int level, int sqlcode, const char *msg)
    1971             : {
    1972             :     char       *detail;
    1973             : 
    1974             :     /* Defend against someone passing us a bogus context struct */
    1975          12 :     if (errcxt->magic != ERRCXT_MAGIC)
    1976           0 :         elog(ERROR, "xml_ereport called with invalid PgXmlErrorContext");
    1977             : 
    1978             :     /* Flag that the current libxml error has been reported */
    1979          12 :     errcxt->err_occurred = false;
    1980             : 
    1981             :     /* Include detail only if we have some text from libxml */
    1982          12 :     if (errcxt->err_buf.len > 0)
    1983          12 :         detail = errcxt->err_buf.data;
    1984             :     else
    1985           0 :         detail = NULL;
    1986             : 
    1987          12 :     ereport(level,
    1988             :             (errcode(sqlcode),
    1989             :              errmsg_internal("%s", msg),
    1990             :              detail ? errdetail_internal("%s", detail) : 0));
    1991           0 : }
    1992             : 
    1993             : 
    1994             : /*
    1995             :  * xml_errsave --- save an XML-related error
    1996             :  *
    1997             :  * If escontext is an ErrorSaveContext, error details are saved into it,
    1998             :  * and control returns normally.
    1999             :  *
    2000             :  * Otherwise, the error is thrown, so that this is equivalent to
    2001             :  * xml_ereport() with level == ERROR.
    2002             :  *
    2003             :  * This should be used only for errors that we're sure we do not need
    2004             :  * a transaction abort to clean up after.
    2005             :  */
    2006             : static void
    2007         204 : xml_errsave(Node *escontext, PgXmlErrorContext *errcxt,
    2008             :             int sqlcode, const char *msg)
    2009             : {
    2010             :     char       *detail;
    2011             : 
    2012             :     /* Defend against someone passing us a bogus context struct */
    2013         204 :     if (errcxt->magic != ERRCXT_MAGIC)
    2014           0 :         elog(ERROR, "xml_errsave called with invalid PgXmlErrorContext");
    2015             : 
    2016             :     /* Flag that the current libxml error has been reported */
    2017         204 :     errcxt->err_occurred = false;
    2018             : 
    2019             :     /* Include detail only if we have some text from libxml */
    2020         204 :     if (errcxt->err_buf.len > 0)
    2021         204 :         detail = errcxt->err_buf.data;
    2022             :     else
    2023           0 :         detail = NULL;
    2024             : 
    2025         204 :     errsave(escontext,
    2026             :             (errcode(sqlcode),
    2027             :              errmsg_internal("%s", msg),
    2028             :              detail ? errdetail_internal("%s", detail) : 0));
    2029         108 : }
    2030             : 
    2031             : 
    2032             : /*
    2033             :  * Error handler for libxml errors and warnings
    2034             :  */
    2035             : static void
    2036         398 : xml_errorHandler(void *data, PgXmlErrorPtr error)
    2037             : {
    2038         398 :     PgXmlErrorContext *xmlerrcxt = (PgXmlErrorContext *) data;
    2039         398 :     xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) error->ctxt;
    2040         398 :     xmlParserInputPtr input = (ctxt != NULL) ? ctxt->input : NULL;
    2041         398 :     xmlNodePtr  node = error->node;
    2042         398 :     const xmlChar *name = (node != NULL &&
    2043         398 :                            node->type == XML_ELEMENT_NODE) ? node->name : NULL;
    2044         398 :     int         domain = error->domain;
    2045         398 :     int         level = error->level;
    2046             :     StringInfo  errorBuf;
    2047             : 
    2048             :     /*
    2049             :      * Defend against someone passing us a bogus context struct.
    2050             :      *
    2051             :      * We force a backend exit if this check fails because longjmp'ing out of
    2052             :      * libxml would likely render it unsafe to use further.
    2053             :      */
    2054         398 :     if (xmlerrcxt->magic != ERRCXT_MAGIC)
    2055           0 :         elog(FATAL, "xml_errorHandler called with invalid PgXmlErrorContext");
    2056             : 
    2057             :     /*----------
    2058             :      * Older libxml versions report some errors differently.
    2059             :      * First, some errors were previously reported as coming from the parser
    2060             :      * domain but are now reported as coming from the namespace domain.
    2061             :      * Second, some warnings were upgraded to errors.
    2062             :      * We attempt to compensate for that here.
    2063             :      *----------
    2064             :      */
    2065         398 :     switch (error->code)
    2066             :     {
    2067          30 :         case XML_WAR_NS_URI:
    2068          30 :             level = XML_ERR_ERROR;
    2069          30 :             domain = XML_FROM_NAMESPACE;
    2070          30 :             break;
    2071             : 
    2072          54 :         case XML_ERR_NS_DECL_ERROR:
    2073             :         case XML_WAR_NS_URI_RELATIVE:
    2074             :         case XML_WAR_NS_COLUMN:
    2075             :         case XML_NS_ERR_XML_NAMESPACE:
    2076             :         case XML_NS_ERR_UNDEFINED_NAMESPACE:
    2077             :         case XML_NS_ERR_QNAME:
    2078             :         case XML_NS_ERR_ATTRIBUTE_REDEFINED:
    2079             :         case XML_NS_ERR_EMPTY:
    2080          54 :             domain = XML_FROM_NAMESPACE;
    2081          54 :             break;
    2082             :     }
    2083             : 
    2084             :     /* Decide whether to act on the error or not */
    2085         398 :     switch (domain)
    2086             :     {
    2087         314 :         case XML_FROM_PARSER:
    2088             :         case XML_FROM_NONE:
    2089             :         case XML_FROM_MEMORY:
    2090             :         case XML_FROM_IO:
    2091             : 
    2092             :             /*
    2093             :              * Suppress warnings about undeclared entities.  We need to do
    2094             :              * this to avoid problems due to not loading DTD definitions.
    2095             :              */
    2096         314 :             if (error->code == XML_WAR_UNDECLARED_ENTITY)
    2097           6 :                 return;
    2098             : 
    2099             :             /* Otherwise, accept error regardless of the parsing purpose */
    2100         308 :             break;
    2101             : 
    2102          84 :         default:
    2103             :             /* Ignore error if only doing well-formedness check */
    2104          84 :             if (xmlerrcxt->strictness == PG_XML_STRICTNESS_WELLFORMED)
    2105          66 :                 return;
    2106          18 :             break;
    2107             :     }
    2108             : 
    2109             :     /* Prepare error message in errorBuf */
    2110         326 :     errorBuf = makeStringInfo();
    2111             : 
    2112         326 :     if (error->line > 0)
    2113         326 :         appendStringInfo(errorBuf, "line %d: ", error->line);
    2114         326 :     if (name != NULL)
    2115           0 :         appendStringInfo(errorBuf, "element %s: ", name);
    2116         326 :     if (error->message != NULL)
    2117         326 :         appendStringInfoString(errorBuf, error->message);
    2118             :     else
    2119           0 :         appendStringInfoString(errorBuf, "(no message provided)");
    2120             : 
    2121             :     /*
    2122             :      * Append context information to errorBuf.
    2123             :      *
    2124             :      * xmlParserPrintFileContext() uses libxml's "generic" error handler to
    2125             :      * write the context.  Since we don't want to duplicate libxml
    2126             :      * functionality here, we set up a generic error handler temporarily.
    2127             :      *
    2128             :      * We use appendStringInfo() directly as libxml's generic error handler.
    2129             :      * This should work because it has essentially the same signature as
    2130             :      * libxml expects, namely (void *ptr, const char *msg, ...).
    2131             :      */
    2132         326 :     if (input != NULL)
    2133             :     {
    2134         326 :         xmlGenericErrorFunc errFuncSaved = xmlGenericError;
    2135         326 :         void       *errCtxSaved = xmlGenericErrorContext;
    2136             : 
    2137         326 :         xmlSetGenericErrorFunc((void *) errorBuf,
    2138             :                                (xmlGenericErrorFunc) appendStringInfo);
    2139             : 
    2140             :         /* Add context information to errorBuf */
    2141         326 :         appendStringInfoLineSeparator(errorBuf);
    2142             : 
    2143         326 :         xmlParserPrintFileContext(input);
    2144             : 
    2145             :         /* Restore generic error func */
    2146         326 :         xmlSetGenericErrorFunc(errCtxSaved, errFuncSaved);
    2147             :     }
    2148             : 
    2149             :     /* Get rid of any trailing newlines in errorBuf */
    2150         326 :     chopStringInfoNewlines(errorBuf);
    2151             : 
    2152             :     /*
    2153             :      * Legacy error handling mode.  err_occurred is never set, we just add the
    2154             :      * message to err_buf.  This mode exists because the xml2 contrib module
    2155             :      * uses our error-handling infrastructure, but we don't want to change its
    2156             :      * behaviour since it's deprecated anyway.  This is also why we don't
    2157             :      * distinguish between notices, warnings and errors here --- the old-style
    2158             :      * generic error handler wouldn't have done that either.
    2159             :      */
    2160         326 :     if (xmlerrcxt->strictness == PG_XML_STRICTNESS_LEGACY)
    2161             :     {
    2162           2 :         appendStringInfoLineSeparator(&xmlerrcxt->err_buf);
    2163           2 :         appendBinaryStringInfo(&xmlerrcxt->err_buf, errorBuf->data,
    2164             :                                errorBuf->len);
    2165             : 
    2166           2 :         destroyStringInfo(errorBuf);
    2167           2 :         return;
    2168             :     }
    2169             : 
    2170             :     /*
    2171             :      * We don't want to ereport() here because that'd probably leave libxml in
    2172             :      * an inconsistent state.  Instead, we remember the error and ereport()
    2173             :      * from xml_ereport().
    2174             :      *
    2175             :      * Warnings and notices can be reported immediately since they won't cause
    2176             :      * a longjmp() out of libxml.
    2177             :      */
    2178         324 :     if (level >= XML_ERR_ERROR)
    2179             :     {
    2180         318 :         appendStringInfoLineSeparator(&xmlerrcxt->err_buf);
    2181         318 :         appendBinaryStringInfo(&xmlerrcxt->err_buf, errorBuf->data,
    2182             :                                errorBuf->len);
    2183             : 
    2184         318 :         xmlerrcxt->err_occurred = true;
    2185             :     }
    2186           6 :     else if (level >= XML_ERR_WARNING)
    2187             :     {
    2188           6 :         ereport(WARNING,
    2189             :                 (errmsg_internal("%s", errorBuf->data)));
    2190             :     }
    2191             :     else
    2192             :     {
    2193           0 :         ereport(NOTICE,
    2194             :                 (errmsg_internal("%s", errorBuf->data)));
    2195             :     }
    2196             : 
    2197         324 :     destroyStringInfo(errorBuf);
    2198             : }
    2199             : 
    2200             : 
    2201             : /*
    2202             :  * Convert libxml error codes into textual errdetail messages.
    2203             :  *
    2204             :  * This should be called within an ereport or errsave invocation,
    2205             :  * just as errdetail would be.
    2206             :  *
    2207             :  * At the moment, we only need to cover those codes that we
    2208             :  * may raise in this file.
    2209             :  */
    2210             : static int
    2211           6 : errdetail_for_xml_code(int code)
    2212             : {
    2213             :     const char *det;
    2214             : 
    2215           6 :     switch (code)
    2216             :     {
    2217           0 :         case XML_ERR_INVALID_CHAR:
    2218           0 :             det = gettext_noop("Invalid character value.");
    2219           0 :             break;
    2220           0 :         case XML_ERR_SPACE_REQUIRED:
    2221           0 :             det = gettext_noop("Space required.");
    2222           0 :             break;
    2223           6 :         case XML_ERR_STANDALONE_VALUE:
    2224           6 :             det = gettext_noop("standalone accepts only 'yes' or 'no'.");
    2225           6 :             break;
    2226           0 :         case XML_ERR_VERSION_MISSING:
    2227           0 :             det = gettext_noop("Malformed declaration: missing version.");
    2228           0 :             break;
    2229           0 :         case XML_ERR_MISSING_ENCODING:
    2230           0 :             det = gettext_noop("Missing encoding in text declaration.");
    2231           0 :             break;
    2232           0 :         case XML_ERR_XMLDECL_NOT_FINISHED:
    2233           0 :             det = gettext_noop("Parsing XML declaration: '?>' expected.");
    2234           0 :             break;
    2235           0 :         default:
    2236           0 :             det = gettext_noop("Unrecognized libxml error code: %d.");
    2237           0 :             break;
    2238             :     }
    2239             : 
    2240           6 :     return errdetail(det, code);
    2241             : }
    2242             : 
    2243             : 
    2244             : /*
    2245             :  * Remove all trailing newlines from a StringInfo string
    2246             :  */
    2247             : static void
    2248         972 : chopStringInfoNewlines(StringInfo str)
    2249             : {
    2250        1624 :     while (str->len > 0 && str->data[str->len - 1] == '\n')
    2251         652 :         str->data[--str->len] = '\0';
    2252         972 : }
    2253             : 
    2254             : 
    2255             : /*
    2256             :  * Append a newline after removing any existing trailing newlines
    2257             :  */
    2258             : static void
    2259         646 : appendStringInfoLineSeparator(StringInfo str)
    2260             : {
    2261         646 :     chopStringInfoNewlines(str);
    2262         646 :     if (str->len > 0)
    2263         428 :         appendStringInfoChar(str, '\n');
    2264         646 : }
    2265             : 
    2266             : 
    2267             : /*
    2268             :  * Convert one char in the current server encoding to a Unicode codepoint.
    2269             :  */
    2270             : static pg_wchar
    2271       18280 : sqlchar_to_unicode(const char *s)
    2272             : {
    2273             :     char       *utf8string;
    2274             :     pg_wchar    ret[2];         /* need space for trailing zero */
    2275             : 
    2276             :     /* note we're not assuming s is null-terminated */
    2277       18280 :     utf8string = pg_server_to_any(s, pg_mblen(s), PG_UTF8);
    2278             : 
    2279       18280 :     pg_encoding_mb2wchar_with_len(PG_UTF8, utf8string, ret,
    2280             :                                   pg_encoding_mblen(PG_UTF8, utf8string));
    2281             : 
    2282       18280 :     if (utf8string != s)
    2283           0 :         pfree(utf8string);
    2284             : 
    2285       18280 :     return ret[0];
    2286             : }
    2287             : 
    2288             : 
    2289             : static bool
    2290        3638 : is_valid_xml_namefirst(pg_wchar c)
    2291             : {
    2292             :     /* (Letter | '_' | ':') */
    2293        3644 :     return (xmlIsBaseCharQ(c) || xmlIsIdeographicQ(c)
    2294        7282 :             || c == '_' || c == ':');
    2295             : }
    2296             : 
    2297             : 
    2298             : static bool
    2299       14642 : is_valid_xml_namechar(pg_wchar c)
    2300             : {
    2301             :     /* Letter | Digit | '.' | '-' | '_' | ':' | CombiningChar | Extender */
    2302       15532 :     return (xmlIsBaseCharQ(c) || xmlIsIdeographicQ(c)
    2303         890 :             || xmlIsDigitQ(c)
    2304         254 :             || c == '.' || c == '-' || c == '_' || c == ':'
    2305          12 :             || xmlIsCombiningQ(c)
    2306       31064 :             || xmlIsExtenderQ(c));
    2307             : }
    2308             : #endif                          /* USE_LIBXML */
    2309             : 
    2310             : 
    2311             : /*
    2312             :  * Map SQL identifier to XML name; see SQL/XML:2008 section 9.1.
    2313             :  */
    2314             : char *
    2315        3652 : map_sql_identifier_to_xml_name(const char *ident, bool fully_escaped,
    2316             :                                bool escape_period)
    2317             : {
    2318             : #ifdef USE_LIBXML
    2319             :     StringInfoData buf;
    2320             :     const char *p;
    2321             : 
    2322             :     /*
    2323             :      * SQL/XML doesn't make use of this case anywhere, so it's probably a
    2324             :      * mistake.
    2325             :      */
    2326             :     Assert(fully_escaped || !escape_period);
    2327             : 
    2328        3652 :     initStringInfo(&buf);
    2329             : 
    2330       21952 :     for (p = ident; *p; p += pg_mblen(p))
    2331             :     {
    2332       18300 :         if (*p == ':' && (p == ident || fully_escaped))
    2333          14 :             appendStringInfoString(&buf, "_x003A_");
    2334       18286 :         else if (*p == '_' && *(p + 1) == 'x')
    2335           6 :             appendStringInfoString(&buf, "_x005F_");
    2336       21568 :         else if (fully_escaped && p == ident &&
    2337        3288 :                  pg_strncasecmp(p, "xml", 3) == 0)
    2338             :         {
    2339           0 :             if (*p == 'x')
    2340           0 :                 appendStringInfoString(&buf, "_x0078_");
    2341             :             else
    2342           0 :                 appendStringInfoString(&buf, "_x0058_");
    2343             :         }
    2344       18280 :         else if (escape_period && *p == '.')
    2345           0 :             appendStringInfoString(&buf, "_x002E_");
    2346             :         else
    2347             :         {
    2348       18280 :             pg_wchar    u = sqlchar_to_unicode(p);
    2349             : 
    2350       36560 :             if ((p == ident)
    2351        3638 :                 ? !is_valid_xml_namefirst(u)
    2352       14642 :                 : !is_valid_xml_namechar(u))
    2353          18 :                 appendStringInfo(&buf, "_x%04X_", (unsigned int) u);
    2354             :             else
    2355       18262 :                 appendBinaryStringInfo(&buf, p, pg_mblen(p));
    2356             :         }
    2357             :     }
    2358             : 
    2359        3652 :     return buf.data;
    2360             : #else                           /* not USE_LIBXML */
    2361             :     NO_XML_SUPPORT();
    2362             :     return NULL;
    2363             : #endif                          /* not USE_LIBXML */
    2364             : }
    2365             : 
    2366             : 
    2367             : /*
    2368             :  * Map XML name to SQL identifier; see SQL/XML:2008 section 9.3.
    2369             :  */
    2370             : char *
    2371         128 : map_xml_name_to_sql_identifier(const char *name)
    2372             : {
    2373             :     StringInfoData buf;
    2374             :     const char *p;
    2375             : 
    2376         128 :     initStringInfo(&buf);
    2377             : 
    2378         704 :     for (p = name; *p; p += pg_mblen(p))
    2379             :     {
    2380         576 :         if (*p == '_' && *(p + 1) == 'x'
    2381          16 :             && isxdigit((unsigned char) *(p + 2))
    2382          16 :             && isxdigit((unsigned char) *(p + 3))
    2383          16 :             && isxdigit((unsigned char) *(p + 4))
    2384          16 :             && isxdigit((unsigned char) *(p + 5))
    2385          16 :             && *(p + 6) == '_')
    2386          16 :         {
    2387             :             char        cbuf[MAX_UNICODE_EQUIVALENT_STRING + 1];
    2388             :             unsigned int u;
    2389             : 
    2390          16 :             sscanf(p + 2, "%X", &u);
    2391          16 :             pg_unicode_to_server(u, (unsigned char *) cbuf);
    2392          16 :             appendStringInfoString(&buf, cbuf);
    2393          16 :             p += 6;
    2394             :         }
    2395             :         else
    2396         560 :             appendBinaryStringInfo(&buf, p, pg_mblen(p));
    2397             :     }
    2398             : 
    2399         128 :     return buf.data;
    2400             : }
    2401             : 
    2402             : /*
    2403             :  * Map SQL value to XML value; see SQL/XML:2008 section 9.8.
    2404             :  *
    2405             :  * When xml_escape_strings is true, then certain characters in string
    2406             :  * values are replaced by entity references (&lt; etc.), as specified
    2407             :  * in SQL/XML:2008 section 9.8 GR 9) a) iii).   This is normally what is
    2408             :  * wanted.  The false case is mainly useful when the resulting value
    2409             :  * is used with xmlTextWriterWriteAttribute() to write out an
    2410             :  * attribute, because that function does the escaping itself.
    2411             :  */
    2412             : char *
    2413      130208 : map_sql_value_to_xml_value(Datum value, Oid type, bool xml_escape_strings)
    2414             : {
    2415      130208 :     if (type_is_array_domain(type))
    2416             :     {
    2417             :         ArrayType  *array;
    2418             :         Oid         elmtype;
    2419             :         int16       elmlen;
    2420             :         bool        elmbyval;
    2421             :         char        elmalign;
    2422             :         int         num_elems;
    2423             :         Datum      *elem_values;
    2424             :         bool       *elem_nulls;
    2425             :         StringInfoData buf;
    2426             :         int         i;
    2427             : 
    2428           6 :         array = DatumGetArrayTypeP(value);
    2429           6 :         elmtype = ARR_ELEMTYPE(array);
    2430           6 :         get_typlenbyvalalign(elmtype, &elmlen, &elmbyval, &elmalign);
    2431             : 
    2432           6 :         deconstruct_array(array, elmtype,
    2433             :                           elmlen, elmbyval, elmalign,
    2434             :                           &elem_values, &elem_nulls,
    2435             :                           &num_elems);
    2436             : 
    2437           6 :         initStringInfo(&buf);
    2438             : 
    2439          24 :         for (i = 0; i < num_elems; i++)
    2440             :         {
    2441          18 :             if (elem_nulls[i])
    2442           0 :                 continue;
    2443          18 :             appendStringInfoString(&buf, "<element>");
    2444          18 :             appendStringInfoString(&buf,
    2445          18 :                                    map_sql_value_to_xml_value(elem_values[i],
    2446             :                                                               elmtype, true));
    2447          18 :             appendStringInfoString(&buf, "</element>");
    2448             :         }
    2449             : 
    2450           6 :         pfree(elem_values);
    2451           6 :         pfree(elem_nulls);
    2452             : 
    2453           6 :         return buf.data;
    2454             :     }
    2455             :     else
    2456             :     {
    2457             :         Oid         typeOut;
    2458             :         bool        isvarlena;
    2459             :         char       *str;
    2460             : 
    2461             :         /*
    2462             :          * Flatten domains; the special-case treatments below should apply to,
    2463             :          * eg, domains over boolean not just boolean.
    2464             :          */
    2465      130202 :         type = getBaseType(type);
    2466             : 
    2467             :         /*
    2468             :          * Special XSD formatting for some data types
    2469             :          */
    2470      130202 :         switch (type)
    2471             :         {
    2472          66 :             case BOOLOID:
    2473          66 :                 if (DatumGetBool(value))
    2474          60 :                     return "true";
    2475             :                 else
    2476           6 :                     return "false";
    2477             : 
    2478          48 :             case DATEOID:
    2479             :                 {
    2480             :                     DateADT     date;
    2481             :                     struct pg_tm tm;
    2482             :                     char        buf[MAXDATELEN + 1];
    2483             : 
    2484          48 :                     date = DatumGetDateADT(value);
    2485             :                     /* XSD doesn't support infinite values */
    2486          48 :                     if (DATE_NOT_FINITE(date))
    2487           0 :                         ereport(ERROR,
    2488             :                                 (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
    2489             :                                  errmsg("date out of range"),
    2490             :                                  errdetail("XML does not support infinite date values.")));
    2491          48 :                     j2date(date + POSTGRES_EPOCH_JDATE,
    2492             :                            &(tm.tm_year), &(tm.tm_mon), &(tm.tm_mday));
    2493          48 :                     EncodeDateOnly(&tm, USE_XSD_DATES, buf);
    2494             : 
    2495          48 :                     return pstrdup(buf);
    2496             :                 }
    2497             : 
    2498          36 :             case TIMESTAMPOID:
    2499             :                 {
    2500             :                     Timestamp   timestamp;
    2501             :                     struct pg_tm tm;
    2502             :                     fsec_t      fsec;
    2503             :                     char        buf[MAXDATELEN + 1];
    2504             : 
    2505          36 :                     timestamp = DatumGetTimestamp(value);
    2506             : 
    2507             :                     /* XSD doesn't support infinite values */
    2508          36 :                     if (TIMESTAMP_NOT_FINITE(timestamp))
    2509           6 :                         ereport(ERROR,
    2510             :                                 (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
    2511             :                                  errmsg("timestamp out of range"),
    2512             :                                  errdetail("XML does not support infinite timestamp values.")));
    2513          30 :                     else if (timestamp2tm(timestamp, NULL, &tm, &fsec, NULL, NULL) == 0)
    2514          30 :                         EncodeDateTime(&tm, fsec, false, 0, NULL, USE_XSD_DATES, buf);
    2515             :                     else
    2516           0 :                         ereport(ERROR,
    2517             :                                 (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
    2518             :                                  errmsg("timestamp out of range")));
    2519             : 
    2520          30 :                     return pstrdup(buf);
    2521             :                 }
    2522             : 
    2523          24 :             case TIMESTAMPTZOID:
    2524             :                 {
    2525             :                     TimestampTz timestamp;
    2526             :                     struct pg_tm tm;
    2527             :                     int         tz;
    2528             :                     fsec_t      fsec;
    2529          24 :                     const char *tzn = NULL;
    2530             :                     char        buf[MAXDATELEN + 1];
    2531             : 
    2532          24 :                     timestamp = DatumGetTimestamp(value);
    2533             : 
    2534             :                     /* XSD doesn't support infinite values */
    2535          24 :                     if (TIMESTAMP_NOT_FINITE(timestamp))
    2536           0 :                         ereport(ERROR,
    2537             :                                 (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
    2538             :                                  errmsg("timestamp out of range"),
    2539             :                                  errdetail("XML does not support infinite timestamp values.")));
    2540          24 :                     else if (timestamp2tm(timestamp, &tz, &tm, &fsec, &tzn, NULL) == 0)
    2541          24 :                         EncodeDateTime(&tm, fsec, true, tz, tzn, USE_XSD_DATES, buf);
    2542             :                     else
    2543           0 :                         ereport(ERROR,
    2544             :                                 (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
    2545             :                                  errmsg("timestamp out of range")));
    2546             : 
    2547          24 :                     return pstrdup(buf);
    2548             :                 }
    2549             : 
    2550             : #ifdef USE_LIBXML
    2551          36 :             case BYTEAOID:
    2552             :                 {
    2553          36 :                     bytea      *bstr = DatumGetByteaPP(value);
    2554             :                     PgXmlErrorContext *xmlerrcxt;
    2555          36 :                     volatile xmlBufferPtr buf = NULL;
    2556          36 :                     volatile xmlTextWriterPtr writer = NULL;
    2557             :                     char       *result;
    2558             : 
    2559          36 :                     xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_ALL);
    2560             : 
    2561          36 :                     PG_TRY();
    2562             :                     {
    2563          36 :                         buf = xmlBufferCreate();
    2564          36 :                         if (buf == NULL || xmlerrcxt->err_occurred)
    2565           0 :                             xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
    2566             :                                         "could not allocate xmlBuffer");
    2567          36 :                         writer = xmlNewTextWriterMemory(buf, 0);
    2568          36 :                         if (writer == NULL || xmlerrcxt->err_occurred)
    2569           0 :                             xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
    2570             :                                         "could not allocate xmlTextWriter");
    2571             : 
    2572          36 :                         if (xmlbinary == XMLBINARY_BASE64)
    2573          30 :                             xmlTextWriterWriteBase64(writer, VARDATA_ANY(bstr),
    2574          30 :                                                      0, VARSIZE_ANY_EXHDR(bstr));
    2575             :                         else
    2576           6 :                             xmlTextWriterWriteBinHex(writer, VARDATA_ANY(bstr),
    2577           6 :                                                      0, VARSIZE_ANY_EXHDR(bstr));
    2578             : 
    2579             :                         /* we MUST do this now to flush data out to the buffer */
    2580          36 :                         xmlFreeTextWriter(writer);
    2581          36 :                         writer = NULL;
    2582             : 
    2583          36 :                         result = pstrdup((const char *) xmlBufferContent(buf));
    2584             :                     }
    2585           0 :                     PG_CATCH();
    2586             :                     {
    2587           0 :                         if (writer)
    2588           0 :                             xmlFreeTextWriter(writer);
    2589           0 :                         if (buf)
    2590           0 :                             xmlBufferFree(buf);
    2591             : 
    2592           0 :                         pg_xml_done(xmlerrcxt, true);
    2593             : 
    2594           0 :                         PG_RE_THROW();
    2595             :                     }
    2596          36 :                     PG_END_TRY();
    2597             : 
    2598          36 :                     xmlBufferFree(buf);
    2599             : 
    2600          36 :                     pg_xml_done(xmlerrcxt, false);
    2601             : 
    2602          36 :                     return result;
    2603             :                 }
    2604             : #endif                          /* USE_LIBXML */
    2605             : 
    2606             :         }
    2607             : 
    2608             :         /*
    2609             :          * otherwise, just use the type's native text representation
    2610             :          */
    2611      129992 :         getTypeOutputInfo(type, &typeOut, &isvarlena);
    2612      129992 :         str = OidOutputFunctionCall(typeOut, value);
    2613             : 
    2614             :         /* ... exactly as-is for XML, and when escaping is not wanted */
    2615      129992 :         if (type == XMLOID || !xml_escape_strings)
    2616       21598 :             return str;
    2617             : 
    2618             :         /* otherwise, translate special characters as needed */
    2619      108394 :         return escape_xml(str);
    2620             :     }
    2621             : }
    2622             : 
    2623             : 
    2624             : /*
    2625             :  * Escape characters in text that have special meanings in XML.
    2626             :  *
    2627             :  * Returns a palloc'd string.
    2628             :  *
    2629             :  * NB: this is intentionally not dependent on libxml.
    2630             :  */
    2631             : char *
    2632      108640 : escape_xml(const char *str)
    2633             : {
    2634             :     StringInfoData buf;
    2635             :     const char *p;
    2636             : 
    2637      108640 :     initStringInfo(&buf);
    2638      674948 :     for (p = str; *p; p++)
    2639             :     {
    2640      566308 :         switch (*p)
    2641             :         {
    2642           0 :             case '&':
    2643           0 :                 appendStringInfoString(&buf, "&amp;");
    2644           0 :                 break;
    2645          36 :             case '<':
    2646          36 :                 appendStringInfoString(&buf, "&lt;");
    2647          36 :                 break;
    2648          24 :             case '>':
    2649          24 :                 appendStringInfoString(&buf, "&gt;");
    2650          24 :                 break;
    2651           0 :             case '\r':
    2652           0 :                 appendStringInfoString(&buf, "&#x0d;");
    2653           0 :                 break;
    2654      566248 :             default:
    2655      566248 :                 appendStringInfoCharMacro(&buf, *p);
    2656      566248 :                 break;
    2657             :         }
    2658             :     }
    2659      108640 :     return buf.data;
    2660             : }
    2661             : 
    2662             : 
    2663             : static char *
    2664          24 : _SPI_strdup(const char *s)
    2665             : {
    2666          24 :     size_t      len = strlen(s) + 1;
    2667          24 :     char       *ret = SPI_palloc(len);
    2668             : 
    2669          24 :     memcpy(ret, s, len);
    2670          24 :     return ret;
    2671             : }
    2672             : 
    2673             : 
    2674             : /*
    2675             :  * SQL to XML mapping functions
    2676             :  *
    2677             :  * What follows below was at one point intentionally organized so that
    2678             :  * you can read along in the SQL/XML standard. The functions are
    2679             :  * mostly split up the way the clauses lay out in the standards
    2680             :  * document, and the identifiers are also aligned with the standard
    2681             :  * text.  Unfortunately, SQL/XML:2006 reordered the clauses
    2682             :  * differently than SQL/XML:2003, so the order below doesn't make much
    2683             :  * sense anymore.
    2684             :  *
    2685             :  * There are many things going on there:
    2686             :  *
    2687             :  * There are two kinds of mappings: Mapping SQL data (table contents)
    2688             :  * to XML documents, and mapping SQL structure (the "schema") to XML
    2689             :  * Schema.  And there are functions that do both at the same time.
    2690             :  *
    2691             :  * Then you can map a database, a schema, or a table, each in both
    2692             :  * ways.  This breaks down recursively: Mapping a database invokes
    2693             :  * mapping schemas, which invokes mapping tables, which invokes
    2694             :  * mapping rows, which invokes mapping columns, although you can't
    2695             :  * call the last two from the outside.  Because of this, there are a
    2696             :  * number of xyz_internal() functions which are to be called both from
    2697             :  * the function manager wrapper and from some upper layer in a
    2698             :  * recursive call.
    2699             :  *
    2700             :  * See the documentation about what the common function arguments
    2701             :  * nulls, tableforest, and targetns mean.
    2702             :  *
    2703             :  * Some style guidelines for XML output: Use double quotes for quoting
    2704             :  * XML attributes.  Indent XML elements by two spaces, but remember
    2705             :  * that a lot of code is called recursively at different levels, so
    2706             :  * it's better not to indent rather than create output that indents
    2707             :  * and outdents weirdly.  Add newlines to make the output look nice.
    2708             :  */
    2709             : 
    2710             : 
    2711             : /*
    2712             :  * Visibility of objects for XML mappings; see SQL/XML:2008 section
    2713             :  * 4.10.8.
    2714             :  */
    2715             : 
    2716             : /*
    2717             :  * Given a query, which must return type oid as first column, produce
    2718             :  * a list of Oids with the query results.
    2719             :  */
    2720             : static List *
    2721          36 : query_to_oid_list(const char *query)
    2722             : {
    2723             :     uint64      i;
    2724          36 :     List       *list = NIL;
    2725             :     int         spi_result;
    2726             : 
    2727          36 :     spi_result = SPI_execute(query, true, 0);
    2728          36 :     if (spi_result != SPI_OK_SELECT)
    2729           0 :         elog(ERROR, "SPI_execute returned %s for %s",
    2730             :              SPI_result_code_string(spi_result), query);
    2731             : 
    2732         108 :     for (i = 0; i < SPI_processed; i++)
    2733             :     {
    2734             :         Datum       oid;
    2735             :         bool        isnull;
    2736             : 
    2737          72 :         oid = SPI_getbinval(SPI_tuptable->vals[i],
    2738          72 :                             SPI_tuptable->tupdesc,
    2739             :                             1,
    2740             :                             &isnull);
    2741          72 :         if (!isnull)
    2742          72 :             list = lappend_oid(list, DatumGetObjectId(oid));
    2743             :     }
    2744             : 
    2745          36 :     return list;
    2746             : }
    2747             : 
    2748             : 
    2749             : static List *
    2750          36 : schema_get_xml_visible_tables(Oid nspid)
    2751             : {
    2752             :     StringInfoData query;
    2753             : 
    2754          36 :     initStringInfo(&query);
    2755          36 :     appendStringInfo(&query, "SELECT oid FROM pg_catalog.pg_class"
    2756             :                      " WHERE relnamespace = %u AND relkind IN ("
    2757             :                      CppAsString2(RELKIND_RELATION) ","
    2758             :                      CppAsString2(RELKIND_MATVIEW) ","
    2759             :                      CppAsString2(RELKIND_VIEW) ")"
    2760             :                      " AND pg_catalog.has_table_privilege (oid, 'SELECT')"
    2761             :                      " ORDER BY relname;", nspid);
    2762             : 
    2763          36 :     return query_to_oid_list(query.data);
    2764             : }
    2765             : 
    2766             : 
    2767             : /*
    2768             :  * Including the system schemas is probably not useful for a database
    2769             :  * mapping.
    2770             :  */
    2771             : #define XML_VISIBLE_SCHEMAS_EXCLUDE "(nspname ~ '^pg_' OR nspname = 'information_schema')"
    2772             : 
    2773             : #define XML_VISIBLE_SCHEMAS "SELECT oid FROM pg_catalog.pg_namespace WHERE pg_catalog.has_schema_privilege (oid, 'USAGE') AND NOT " XML_VISIBLE_SCHEMAS_EXCLUDE
    2774             : 
    2775             : 
    2776             : static List *
    2777           0 : database_get_xml_visible_schemas(void)
    2778             : {
    2779           0 :     return query_to_oid_list(XML_VISIBLE_SCHEMAS " ORDER BY nspname;");
    2780             : }
    2781             : 
    2782             : 
    2783             : static List *
    2784           0 : database_get_xml_visible_tables(void)
    2785             : {
    2786             :     /* At the moment there is no order required here. */
    2787           0 :     return query_to_oid_list("SELECT oid FROM pg_catalog.pg_class"
    2788             :                              " WHERE relkind IN ("
    2789             :                              CppAsString2(RELKIND_RELATION) ","
    2790             :                              CppAsString2(RELKIND_MATVIEW) ","
    2791             :                              CppAsString2(RELKIND_VIEW) ")"
    2792             :                              " AND pg_catalog.has_table_privilege(pg_class.oid, 'SELECT')"
    2793             :                              " AND relnamespace IN (" XML_VISIBLE_SCHEMAS ");");
    2794             : }
    2795             : 
    2796             : 
    2797             : /*
    2798             :  * Map SQL table to XML and/or XML Schema document; see SQL/XML:2008
    2799             :  * section 9.11.
    2800             :  */
    2801             : 
    2802             : static StringInfo
    2803          96 : table_to_xml_internal(Oid relid,
    2804             :                       const char *xmlschema, bool nulls, bool tableforest,
    2805             :                       const char *targetns, bool top_level)
    2806             : {
    2807             :     StringInfoData query;
    2808             : 
    2809          96 :     initStringInfo(&query);
    2810          96 :     appendStringInfo(&query, "SELECT * FROM %s",
    2811             :                      DatumGetCString(DirectFunctionCall1(regclassout,
    2812             :                                                          ObjectIdGetDatum(relid))));
    2813          96 :     return query_to_xml_internal(query.data, get_rel_name(relid),
    2814             :                                  xmlschema, nulls, tableforest,
    2815             :                                  targetns, top_level);
    2816             : }
    2817             : 
    2818             : 
    2819             : Datum
    2820          36 : table_to_xml(PG_FUNCTION_ARGS)
    2821             : {
    2822          36 :     Oid         relid = PG_GETARG_OID(0);
    2823          36 :     bool        nulls = PG_GETARG_BOOL(1);
    2824          36 :     bool        tableforest = PG_GETARG_BOOL(2);
    2825          36 :     const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
    2826             : 
    2827          36 :     PG_RETURN_XML_P(stringinfo_to_xmltype(table_to_xml_internal(relid, NULL,
    2828             :                                                                 nulls, tableforest,
    2829             :                                                                 targetns, true)));
    2830             : }
    2831             : 
    2832             : 
    2833             : Datum
    2834          10 : query_to_xml(PG_FUNCTION_ARGS)
    2835             : {
    2836          10 :     char       *query = text_to_cstring(PG_GETARG_TEXT_PP(0));
    2837          10 :     bool        nulls = PG_GETARG_BOOL(1);
    2838          10 :     bool        tableforest = PG_GETARG_BOOL(2);
    2839          10 :     const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
    2840             : 
    2841          10 :     PG_RETURN_XML_P(stringinfo_to_xmltype(query_to_xml_internal(query, NULL,
    2842             :                                                                 NULL, nulls, tableforest,
    2843             :                                                                 targetns, true)));
    2844             : }
    2845             : 
    2846             : 
    2847             : Datum
    2848          12 : cursor_to_xml(PG_FUNCTION_ARGS)
    2849             : {
    2850          12 :     char       *name = text_to_cstring(PG_GETARG_TEXT_PP(0));
    2851          12 :     int32       count = PG_GETARG_INT32(1);
    2852          12 :     bool        nulls = PG_GETARG_BOOL(2);
    2853          12 :     bool        tableforest = PG_GETARG_BOOL(3);
    2854          12 :     const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(4));
    2855             : 
    2856             :     StringInfoData result;
    2857             :     Portal      portal;
    2858             :     uint64      i;
    2859             : 
    2860          12 :     initStringInfo(&result);
    2861             : 
    2862          12 :     if (!tableforest)
    2863             :     {
    2864           6 :         xmldata_root_element_start(&result, "table", NULL, targetns, true);
    2865           6 :         appendStringInfoChar(&result, '\n');
    2866             :     }
    2867             : 
    2868          12 :     SPI_connect();
    2869          12 :     portal = SPI_cursor_find(name);
    2870          12 :     if (portal == NULL)
    2871           0 :         ereport(ERROR,
    2872             :                 (errcode(ERRCODE_UNDEFINED_CURSOR),
    2873             :                  errmsg("cursor \"%s\" does not exist", name)));
    2874             : 
    2875          12 :     SPI_cursor_fetch(portal, true, count);
    2876          48 :     for (i = 0; i < SPI_processed; i++)
    2877          36 :         SPI_sql_row_to_xmlelement(i, &result, NULL, nulls,
    2878             :                                   tableforest, targetns, true);
    2879             : 
    2880          12 :     SPI_finish();
    2881             : 
    2882          12 :     if (!tableforest)
    2883           6 :         xmldata_root_element_end(&result, "table");
    2884             : 
    2885          12 :     PG_RETURN_XML_P(stringinfo_to_xmltype(&result));
    2886             : }
    2887             : 
    2888             : 
    2889             : /*
    2890             :  * Write the start tag of the root element of a data mapping.
    2891             :  *
    2892             :  * top_level means that this is the very top level of the eventual
    2893             :  * output.  For example, when the user calls table_to_xml, then a call
    2894             :  * with a table name to this function is the top level.  When the user
    2895             :  * calls database_to_xml, then a call with a schema name to this
    2896             :  * function is not the top level.  If top_level is false, then the XML
    2897             :  * namespace declarations are omitted, because they supposedly already
    2898             :  * appeared earlier in the output.  Repeating them is not wrong, but
    2899             :  * it looks ugly.
    2900             :  */
    2901             : static void
    2902         238 : xmldata_root_element_start(StringInfo result, const char *eltname,
    2903             :                            const char *xmlschema, const char *targetns,
    2904             :                            bool top_level)
    2905             : {
    2906             :     /* This isn't really wrong but currently makes no sense. */
    2907             :     Assert(top_level || !xmlschema);
    2908             : 
    2909         238 :     appendStringInfo(result, "<%s", eltname);
    2910         238 :     if (top_level)
    2911             :     {
    2912         178 :         appendStringInfoString(result, " xmlns:xsi=\"" NAMESPACE_XSI "\"");
    2913         178 :         if (strlen(targetns) > 0)
    2914          30 :             appendStringInfo(result, " xmlns=\"%s\"", targetns);
    2915             :     }
    2916         238 :     if (xmlschema)
    2917             :     {
    2918             :         /* FIXME: better targets */
    2919          18 :         if (strlen(targetns) > 0)
    2920           6 :             appendStringInfo(result, " xsi:schemaLocation=\"%s #\"", targetns);
    2921             :         else
    2922          12 :             appendStringInfoString(result, " xsi:noNamespaceSchemaLocation=\"#\"");
    2923             :     }
    2924         238 :     appendStringInfoString(result, ">\n");
    2925         238 : }
    2926             : 
    2927             : 
    2928             : static void
    2929         238 : xmldata_root_element_end(StringInfo result, const char *eltname)
    2930             : {
    2931         238 :     appendStringInfo(result, "</%s>\n", eltname);
    2932         238 : }
    2933             : 
    2934             : 
    2935             : static StringInfo
    2936         112 : query_to_xml_internal(const char *query, char *tablename,
    2937             :                       const char *xmlschema, bool nulls, bool tableforest,
    2938             :                       const char *targetns, bool top_level)
    2939             : {
    2940             :     StringInfo  result;
    2941             :     char       *xmltn;
    2942             :     uint64      i;
    2943             : 
    2944         112 :     if (tablename)
    2945          96 :         xmltn = map_sql_identifier_to_xml_name(tablename, true, false);
    2946             :     else
    2947          16 :         xmltn = "table";
    2948             : 
    2949         112 :     result = makeStringInfo();
    2950             : 
    2951         112 :     SPI_connect();
    2952         112 :     if (SPI_execute(query, true, 0) != SPI_OK_SELECT)
    2953           0 :         ereport(ERROR,
    2954             :                 (errcode(ERRCODE_DATA_EXCEPTION),
    2955             :                  errmsg("invalid query")));
    2956             : 
    2957         112 :     if (!tableforest)
    2958             :     {
    2959          52 :         xmldata_root_element_start(result, xmltn, xmlschema,
    2960             :                                    targetns, top_level);
    2961          52 :         appendStringInfoChar(result, '\n');
    2962             :     }
    2963             : 
    2964         112 :     if (xmlschema)
    2965          30 :         appendStringInfo(result, "%s\n\n", xmlschema);
    2966             : 
    2967         388 :     for (i = 0; i < SPI_processed; i++)
    2968         276 :         SPI_sql_row_to_xmlelement(i, result, tablename, nulls,
    2969             :                                   tableforest, targetns, top_level);
    2970             : 
    2971         112 :     if (!tableforest)
    2972          52 :         xmldata_root_element_end(result, xmltn);
    2973             : 
    2974         112 :     SPI_finish();
    2975             : 
    2976         112 :     return result;
    2977             : }
    2978             : 
    2979             : 
    2980             : Datum
    2981          30 : table_to_xmlschema(PG_FUNCTION_ARGS)
    2982             : {
    2983          30 :     Oid         relid = PG_GETARG_OID(0);
    2984          30 :     bool        nulls = PG_GETARG_BOOL(1);
    2985          30 :     bool        tableforest = PG_GETARG_BOOL(2);
    2986          30 :     const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
    2987             :     const char *result;
    2988             :     Relation    rel;
    2989             : 
    2990          30 :     rel = table_open(relid, AccessShareLock);
    2991          30 :     result = map_sql_table_to_xmlschema(rel->rd_att, relid, nulls,
    2992             :                                         tableforest, targetns);
    2993          30 :     table_close(rel, NoLock);
    2994             : 
    2995          30 :     PG_RETURN_XML_P(cstring_to_xmltype(result));
    2996             : }
    2997             : 
    2998             : 
    2999             : Datum
    3000           6 : query_to_xmlschema(PG_FUNCTION_ARGS)
    3001             : {
    3002           6 :     char       *query = text_to_cstring(PG_GETARG_TEXT_PP(0));
    3003           6 :     bool        nulls = PG_GETARG_BOOL(1);
    3004           6 :     bool        tableforest = PG_GETARG_BOOL(2);
    3005           6 :     const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
    3006             :     const char *result;
    3007             :     SPIPlanPtr  plan;
    3008             :     Portal      portal;
    3009             : 
    3010           6 :     SPI_connect();
    3011             : 
    3012           6 :     if ((plan = SPI_prepare(query, 0, NULL)) == NULL)
    3013           0 :         elog(ERROR, "SPI_prepare(\"%s\") failed", query);
    3014             : 
    3015           6 :     if ((portal = SPI_cursor_open(NULL, plan, NULL, NULL, true)) == NULL)
    3016           0 :         elog(ERROR, "SPI_cursor_open(\"%s\") failed", query);
    3017             : 
    3018           6 :     result = _SPI_strdup(map_sql_table_to_xmlschema(portal->tupDesc,
    3019             :                                                     InvalidOid, nulls,
    3020             :                                                     tableforest, targetns));
    3021           6 :     SPI_cursor_close(portal);
    3022           6 :     SPI_finish();
    3023             : 
    3024           6 :     PG_RETURN_XML_P(cstring_to_xmltype(result));
    3025             : }
    3026             : 
    3027             : 
    3028             : Datum
    3029          12 : cursor_to_xmlschema(PG_FUNCTION_ARGS)
    3030             : {
    3031          12 :     char       *name = text_to_cstring(PG_GETARG_TEXT_PP(0));
    3032          12 :     bool        nulls = PG_GETARG_BOOL(1);
    3033          12 :     bool        tableforest = PG_GETARG_BOOL(2);
    3034          12 :     const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
    3035             :     const char *xmlschema;
    3036             :     Portal      portal;
    3037             : 
    3038          12 :     SPI_connect();
    3039          12 :     portal = SPI_cursor_find(name);
    3040          12 :     if (portal == NULL)
    3041           0 :         ereport(ERROR,
    3042             :                 (errcode(ERRCODE_UNDEFINED_CURSOR),
    3043             :                  errmsg("cursor \"%s\" does not exist", name)));
    3044          12 :     if (portal->tupDesc == NULL)
    3045           0 :         ereport(ERROR,
    3046             :                 (errcode(ERRCODE_INVALID_CURSOR_STATE),
    3047             :                  errmsg("portal \"%s\" does not return tuples", name)));
    3048             : 
    3049          12 :     xmlschema = _SPI_strdup(map_sql_table_to_xmlschema(portal->tupDesc,
    3050             :                                                        InvalidOid, nulls,
    3051             :                                                        tableforest, targetns));
    3052          12 :     SPI_finish();
    3053             : 
    3054          12 :     PG_RETURN_XML_P(cstring_to_xmltype(xmlschema));
    3055             : }
    3056             : 
    3057             : 
    3058             : Datum
    3059          24 : table_to_xml_and_xmlschema(PG_FUNCTION_ARGS)
    3060             : {
    3061          24 :     Oid         relid = PG_GETARG_OID(0);
    3062          24 :     bool        nulls = PG_GETARG_BOOL(1);
    3063          24 :     bool        tableforest = PG_GETARG_BOOL(2);
    3064          24 :     const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
    3065             :     Relation    rel;
    3066             :     const char *xmlschema;
    3067             : 
    3068          24 :     rel = table_open(relid, AccessShareLock);
    3069          24 :     xmlschema = map_sql_table_to_xmlschema(rel->rd_att, relid, nulls,
    3070             :                                            tableforest, targetns);
    3071          24 :     table_close(rel, NoLock);
    3072             : 
    3073          24 :     PG_RETURN_XML_P(stringinfo_to_xmltype(table_to_xml_internal(relid,
    3074             :                                                                 xmlschema, nulls, tableforest,
    3075             :                                                                 targetns, true)));
    3076             : }
    3077             : 
    3078             : 
    3079             : Datum
    3080           6 : query_to_xml_and_xmlschema(PG_FUNCTION_ARGS)
    3081             : {
    3082           6 :     char       *query = text_to_cstring(PG_GETARG_TEXT_PP(0));
    3083           6 :     bool        nulls = PG_GETARG_BOOL(1);
    3084           6 :     bool        tableforest = PG_GETARG_BOOL(2);
    3085           6 :     const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
    3086             : 
    3087             :     const char *xmlschema;
    3088             :     SPIPlanPtr  plan;
    3089             :     Portal      portal;
    3090             : 
    3091           6 :     SPI_connect();
    3092             : 
    3093           6 :     if ((plan = SPI_prepare(query, 0, NULL)) == NULL)
    3094           0 :         elog(ERROR, "SPI_prepare(\"%s\") failed", query);
    3095             : 
    3096           6 :     if ((portal = SPI_cursor_open(NULL, plan, NULL, NULL, true)) == NULL)
    3097           0 :         elog(ERROR, "SPI_cursor_open(\"%s\") failed", query);
    3098             : 
    3099           6 :     xmlschema = _SPI_strdup(map_sql_table_to_xmlschema(portal->tupDesc,
    3100             :                                                        InvalidOid, nulls, tableforest, targetns));
    3101           6 :     SPI_cursor_close(portal);
    3102           6 :     SPI_finish();
    3103             : 
    3104           6 :     PG_RETURN_XML_P(stringinfo_to_xmltype(query_to_xml_internal(query, NULL,
    3105             :                                                                 xmlschema, nulls, tableforest,
    3106             :                                                                 targetns, true)));
    3107             : }
    3108             : 
    3109             : 
    3110             : /*
    3111             :  * Map SQL schema to XML and/or XML Schema document; see SQL/XML:2008
    3112             :  * sections 9.13, 9.14.
    3113             :  */
    3114             : 
    3115             : static StringInfo
    3116          18 : schema_to_xml_internal(Oid nspid, const char *xmlschema, bool nulls,
    3117             :                        bool tableforest, const char *targetns, bool top_level)
    3118             : {
    3119             :     StringInfo  result;
    3120             :     char       *xmlsn;
    3121             :     List       *relid_list;
    3122             :     ListCell   *cell;
    3123             : 
    3124          18 :     xmlsn = map_sql_identifier_to_xml_name(get_namespace_name(nspid),
    3125             :                                            true, false);
    3126          18 :     result = makeStringInfo();
    3127             : 
    3128          18 :     xmldata_root_element_start(result, xmlsn, xmlschema, targetns, top_level);
    3129          18 :     appendStringInfoChar(result, '\n');
    3130             : 
    3131          18 :     if (xmlschema)
    3132           6 :         appendStringInfo(result, "%s\n\n", xmlschema);
    3133             : 
    3134          18 :     SPI_connect();
    3135             : 
    3136          18 :     relid_list = schema_get_xml_visible_tables(nspid);
    3137             : 
    3138          54 :     foreach(cell, relid_list)
    3139             :     {
    3140          36 :         Oid         relid = lfirst_oid(cell);
    3141             :         StringInfo  subres;
    3142             : 
    3143          36 :         subres = table_to_xml_internal(relid, NULL, nulls, tableforest,
    3144             :                                        targetns, false);
    3145             : 
    3146          36 :         appendBinaryStringInfo(result, subres->data, subres->len);
    3147          36 :         appendStringInfoChar(result, '\n');
    3148             :     }
    3149             : 
    3150          18 :     SPI_finish();
    3151             : 
    3152          18 :     xmldata_root_element_end(result, xmlsn);
    3153             : 
    3154          18 :     return result;
    3155             : }
    3156             : 
    3157             : 
    3158             : Datum
    3159          12 : schema_to_xml(PG_FUNCTION_ARGS)
    3160             : {
    3161          12 :     Name        name = PG_GETARG_NAME(0);
    3162          12 :     bool        nulls = PG_GETARG_BOOL(1);
    3163          12 :     bool        tableforest = PG_GETARG_BOOL(2);
    3164          12 :     const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
    3165             : 
    3166             :     char       *schemaname;
    3167             :     Oid         nspid;
    3168             : 
    3169          12 :     schemaname = NameStr(*name);
    3170          12 :     nspid = LookupExplicitNamespace(schemaname, false);
    3171             : 
    3172          12 :     PG_RETURN_XML_P(stringinfo_to_xmltype(schema_to_xml_internal(nspid, NULL,
    3173             :                                                                  nulls, tableforest, targetns, true)));
    3174             : }
    3175             : 
    3176             : 
    3177             : /*
    3178             :  * Write the start element of the root element of an XML Schema mapping.
    3179             :  */
    3180             : static void
    3181          96 : xsd_schema_element_start(StringInfo result, const char *targetns)
    3182             : {
    3183          96 :     appendStringInfoString(result,
    3184             :                            "<xsd:schema\n"
    3185             :                            "    xmlns:xsd=\"" NAMESPACE_XSD "\"");
    3186          96 :     if (strlen(targetns) > 0)
    3187          18 :         appendStringInfo(result,
    3188             :                          "\n"
    3189             :                          "    targetNamespace=\"%s\"\n"
    3190             :                          "    elementFormDefault=\"qualified\"",
    3191             :                          targetns);
    3192          96 :     appendStringInfoString(result,
    3193             :                            ">\n\n");
    3194          96 : }
    3195             : 
    3196             : 
    3197             : static void
    3198          96 : xsd_schema_element_end(StringInfo result)
    3199             : {
    3200          96 :     appendStringInfoString(result, "</xsd:schema>");
    3201          96 : }
    3202             : 
    3203             : 
    3204             : static StringInfo
    3205          18 : schema_to_xmlschema_internal(const char *schemaname, bool nulls,
    3206             :                              bool tableforest, const char *targetns)
    3207             : {
    3208             :     Oid         nspid;
    3209             :     List       *relid_list;
    3210             :     List       *tupdesc_list;
    3211             :     ListCell   *cell;
    3212             :     StringInfo  result;
    3213             : 
    3214          18 :     result = makeStringInfo();
    3215             : 
    3216          18 :     nspid = LookupExplicitNamespace(schemaname, false);
    3217             : 
    3218          18 :     xsd_schema_element_start(result, targetns);
    3219             : 
    3220          18 :     SPI_connect();
    3221             : 
    3222          18 :     relid_list = schema_get_xml_visible_tables(nspid);
    3223             : 
    3224          18 :     tupdesc_list = NIL;
    3225          54 :     foreach(cell, relid_list)
    3226             :     {
    3227             :         Relation    rel;
    3228             : 
    3229          36 :         rel = table_open(lfirst_oid(cell), AccessShareLock);
    3230          36 :         tupdesc_list = lappend(tupdesc_list, CreateTupleDescCopy(rel->rd_att));
    3231          36 :         table_close(rel, NoLock);
    3232             :     }
    3233             : 
    3234          18 :     appendStringInfoString(result,
    3235             :                            map_sql_typecoll_to_xmlschema_types(tupdesc_list));
    3236             : 
    3237          18 :     appendStringInfoString(result,
    3238             :                            map_sql_schema_to_xmlschema_types(nspid, relid_list,
    3239             :                                                              nulls, tableforest, targetns));
    3240             : 
    3241          18 :     xsd_schema_element_end(result);
    3242             : 
    3243          18 :     SPI_finish();
    3244             : 
    3245          18 :     return result;
    3246             : }
    3247             : 
    3248             : 
    3249             : Datum
    3250          12 : schema_to_xmlschema(PG_FUNCTION_ARGS)
    3251             : {
    3252          12 :     Name        name = PG_GETARG_NAME(0);
    3253          12 :     bool        nulls = PG_GETARG_BOOL(1);
    3254          12 :     bool        tableforest = PG_GETARG_BOOL(2);
    3255          12 :     const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
    3256             : 
    3257          12 :     PG_RETURN_XML_P(stringinfo_to_xmltype(schema_to_xmlschema_internal(NameStr(*name),
    3258             :                                                                        nulls, tableforest, targetns)));
    3259             : }
    3260             : 
    3261             : 
    3262             : Datum
    3263           6 : schema_to_xml_and_xmlschema(PG_FUNCTION_ARGS)
    3264             : {
    3265           6 :     Name        name = PG_GETARG_NAME(0);
    3266           6 :     bool        nulls = PG_GETARG_BOOL(1);
    3267           6 :     bool        tableforest = PG_GETARG_BOOL(2);
    3268           6 :     const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(3));
    3269             :     char       *schemaname;
    3270             :     Oid         nspid;
    3271             :     StringInfo  xmlschema;
    3272             : 
    3273           6 :     schemaname = NameStr(*name);
    3274           6 :     nspid = LookupExplicitNamespace(schemaname, false);
    3275             : 
    3276           6 :     xmlschema = schema_to_xmlschema_internal(schemaname, nulls,
    3277             :                                              tableforest, targetns);
    3278             : 
    3279           6 :     PG_RETURN_XML_P(stringinfo_to_xmltype(schema_to_xml_internal(nspid,
    3280             :                                                                  xmlschema->data, nulls,
    3281             :                                                                  tableforest, targetns, true)));
    3282             : }
    3283             : 
    3284             : 
    3285             : /*
    3286             :  * Map SQL database to XML and/or XML Schema document; see SQL/XML:2008
    3287             :  * sections 9.16, 9.17.
    3288             :  */
    3289             : 
    3290             : static StringInfo
    3291           0 : database_to_xml_internal(const char *xmlschema, bool nulls,
    3292             :                          bool tableforest, const char *targetns)
    3293             : {
    3294             :     StringInfo  result;
    3295             :     List       *nspid_list;
    3296             :     ListCell   *cell;
    3297             :     char       *xmlcn;
    3298             : 
    3299           0 :     xmlcn = map_sql_identifier_to_xml_name(get_database_name(MyDatabaseId),
    3300             :                                            true, false);
    3301           0 :     result = makeStringInfo();
    3302             : 
    3303           0 :     xmldata_root_element_start(result, xmlcn, xmlschema, targetns, true);
    3304           0 :     appendStringInfoChar(result, '\n');
    3305             : 
    3306           0 :     if (xmlschema)
    3307           0 :         appendStringInfo(result, "%s\n\n", xmlschema);
    3308             : 
    3309           0 :     SPI_connect();
    3310             : 
    3311           0 :     nspid_list = database_get_xml_visible_schemas();
    3312             : 
    3313           0 :     foreach(cell, nspid_list)
    3314             :     {
    3315           0 :         Oid         nspid = lfirst_oid(cell);
    3316             :         StringInfo  subres;
    3317             : 
    3318           0 :         subres = schema_to_xml_internal(nspid, NULL, nulls,
    3319             :                                         tableforest, targetns, false);
    3320             : 
    3321           0 :         appendBinaryStringInfo(result, subres->data, subres->len);
    3322           0 :         appendStringInfoChar(result, '\n');
    3323             :     }
    3324             : 
    3325           0 :     SPI_finish();
    3326             : 
    3327           0 :     xmldata_root_element_end(result, xmlcn);
    3328             : 
    3329           0 :     return result;
    3330             : }
    3331             : 
    3332             : 
    3333             : Datum
    3334           0 : database_to_xml(PG_FUNCTION_ARGS)
    3335             : {
    3336           0 :     bool        nulls = PG_GETARG_BOOL(0);
    3337           0 :     bool        tableforest = PG_GETARG_BOOL(1);
    3338           0 :     const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(2));
    3339             : 
    3340           0 :     PG_RETURN_XML_P(stringinfo_to_xmltype(database_to_xml_internal(NULL, nulls,
    3341             :                                                                    tableforest, targetns)));
    3342             : }
    3343             : 
    3344             : 
    3345             : static StringInfo
    3346           0 : database_to_xmlschema_internal(bool nulls, bool tableforest,
    3347             :                                const char *targetns)
    3348             : {
    3349             :     List       *relid_list;
    3350             :     List       *nspid_list;
    3351             :     List       *tupdesc_list;
    3352             :     ListCell   *cell;
    3353             :     StringInfo  result;
    3354             : 
    3355           0 :     result = makeStringInfo();
    3356             : 
    3357           0 :     xsd_schema_element_start(result, targetns);
    3358             : 
    3359           0 :     SPI_connect();
    3360             : 
    3361           0 :     relid_list = database_get_xml_visible_tables();
    3362           0 :     nspid_list = database_get_xml_visible_schemas();
    3363             : 
    3364           0 :     tupdesc_list = NIL;
    3365           0 :     foreach(cell, relid_list)
    3366             :     {
    3367             :         Relation    rel;
    3368             : 
    3369           0 :         rel = table_open(lfirst_oid(cell), AccessShareLock);
    3370           0 :         tupdesc_list = lappend(tupdesc_list, CreateTupleDescCopy(rel->rd_att));
    3371           0 :         table_close(rel, NoLock);
    3372             :     }
    3373             : 
    3374           0 :     appendStringInfoString(result,
    3375             :                            map_sql_typecoll_to_xmlschema_types(tupdesc_list));
    3376             : 
    3377           0 :     appendStringInfoString(result,
    3378             :                            map_sql_catalog_to_xmlschema_types(nspid_list, nulls, tableforest, targetns));
    3379             : 
    3380           0 :     xsd_schema_element_end(result);
    3381             : 
    3382           0 :     SPI_finish();
    3383             : 
    3384           0 :     return result;
    3385             : }
    3386             : 
    3387             : 
    3388             : Datum
    3389           0 : database_to_xmlschema(PG_FUNCTION_ARGS)
    3390             : {
    3391           0 :     bool        nulls = PG_GETARG_BOOL(0);
    3392           0 :     bool        tableforest = PG_GETARG_BOOL(1);
    3393           0 :     const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(2));
    3394             : 
    3395           0 :     PG_RETURN_XML_P(stringinfo_to_xmltype(database_to_xmlschema_internal(nulls,
    3396             :                                                                          tableforest, targetns)));
    3397             : }
    3398             : 
    3399             : 
    3400             : Datum
    3401           0 : database_to_xml_and_xmlschema(PG_FUNCTION_ARGS)
    3402             : {
    3403           0 :     bool        nulls = PG_GETARG_BOOL(0);
    3404           0 :     bool        tableforest = PG_GETARG_BOOL(1);
    3405           0 :     const char *targetns = text_to_cstring(PG_GETARG_TEXT_PP(2));
    3406             :     StringInfo  xmlschema;
    3407             : 
    3408           0 :     xmlschema = database_to_xmlschema_internal(nulls, tableforest, targetns);
    3409             : 
    3410           0 :     PG_RETURN_XML_P(stringinfo_to_xmltype(database_to_xml_internal(xmlschema->data,
    3411             :                                                                    nulls, tableforest, targetns)));
    3412             : }
    3413             : 
    3414             : 
    3415             : /*
    3416             :  * Map a multi-part SQL name to an XML name; see SQL/XML:2008 section
    3417             :  * 9.2.
    3418             :  */
    3419             : static char *
    3420         384 : map_multipart_sql_identifier_to_xml_name(const char *a, const char *b, const char *c, const char *d)
    3421             : {
    3422             :     StringInfoData result;
    3423             : 
    3424         384 :     initStringInfo(&result);
    3425             : 
    3426         384 :     if (a)
    3427         384 :         appendStringInfoString(&result,
    3428         384 :                                map_sql_identifier_to_xml_name(a, true, true));
    3429         384 :     if (b)
    3430         384 :         appendStringInfo(&result, ".%s",
    3431             :                          map_sql_identifier_to_xml_name(b, true, true));
    3432         384 :     if (c)
    3433         384 :         appendStringInfo(&result, ".%s",
    3434             :                          map_sql_identifier_to_xml_name(c, true, true));
    3435         384 :     if (d)
    3436         366 :         appendStringInfo(&result, ".%s",
    3437             :                          map_sql_identifier_to_xml_name(d, true, true));
    3438             : 
    3439         384 :     return result.data;
    3440             : }
    3441             : 
    3442             : 
    3443             : /*
    3444             :  * Map an SQL table to an XML Schema document; see SQL/XML:2008
    3445             :  * section 9.11.
    3446             :  *
    3447             :  * Map an SQL table to XML Schema data types; see SQL/XML:2008 section
    3448             :  * 9.9.
    3449             :  */
    3450             : static const char *
    3451          78 : map_sql_table_to_xmlschema(TupleDesc tupdesc, Oid relid, bool nulls,
    3452             :                            bool tableforest, const char *targetns)
    3453             : {
    3454             :     int         i;
    3455             :     char       *xmltn;
    3456             :     char       *tabletypename;
    3457             :     char       *rowtypename;
    3458             :     StringInfoData result;
    3459             : 
    3460          78 :     initStringInfo(&result);
    3461             : 
    3462          78 :     if (OidIsValid(relid))
    3463             :     {
    3464             :         HeapTuple   tuple;
    3465             :         Form_pg_class reltuple;
    3466             : 
    3467          54 :         tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
    3468          54 :         if (!HeapTupleIsValid(tuple))
    3469           0 :             elog(ERROR, "cache lookup failed for relation %u", relid);
    3470          54 :         reltuple = (Form_pg_class) GETSTRUCT(tuple);
    3471             : 
    3472          54 :         xmltn = map_sql_identifier_to_xml_name(NameStr(reltuple->relname),
    3473             :                                                true, false);
    3474             : 
    3475          54 :         tabletypename = map_multipart_sql_identifier_to_xml_name("TableType",
    3476          54 :                                                                  get_database_name(MyDatabaseId),
    3477          54 :                                                                  get_namespace_name(reltuple->relnamespace),
    3478          54 :                                                                  NameStr(reltuple->relname));
    3479             : 
    3480          54 :         rowtypename = map_multipart_sql_identifier_to_xml_name("RowType",
    3481          54 :                                                                get_database_name(MyDatabaseId),
    3482          54 :                                                                get_namespace_name(reltuple->relnamespace),
    3483          54 :                                                                NameStr(reltuple->relname));
    3484             : 
    3485          54 :         ReleaseSysCache(tuple);
    3486             :     }
    3487             :     else
    3488             :     {
    3489          24 :         if (tableforest)
    3490          12 :             xmltn = "row";
    3491             :         else
    3492          12 :             xmltn = "table";
    3493             : 
    3494          24 :         tabletypename = "TableType";
    3495          24 :         rowtypename = "RowType";
    3496             :     }
    3497             : 
    3498          78 :     xsd_schema_element_start(&result, targetns);
    3499             : 
    3500          78 :     appendStringInfoString(&result,
    3501          78 :                            map_sql_typecoll_to_xmlschema_types(list_make1(tupdesc)));
    3502             : 
    3503          78 :     appendStringInfo(&result,
    3504             :                      "<xsd:complexType name=\"%s\">\n"
    3505             :                      "  <xsd:sequence>\n",
    3506             :                      rowtypename);
    3507             : 
    3508         324 :     for (i = 0; i < tupdesc->natts; i++)
    3509             :     {
    3510         246 :         Form_pg_attribute att = TupleDescAttr(tupdesc, i);
    3511             : 
    3512         246 :         if (att->attisdropped)
    3513           6 :             continue;
    3514         480 :         appendStringInfo(&result,
    3515             :                          "    <xsd:element name=\"%s\" type=\"%s\"%s></xsd:element>\n",
    3516         240 :                          map_sql_identifier_to_xml_name(NameStr(att->attname),
    3517             :                                                         true, false),
    3518             :                          map_sql_type_to_xml_name(att->atttypid, -1),
    3519             :                          nulls ? " nillable=\"true\"" : " minOccurs=\"0\"");
    3520             :     }
    3521             : 
    3522          78 :     appendStringInfoString(&result,
    3523             :                            "  </xsd:sequence>\n"
    3524             :                            "</xsd:complexType>\n\n");
    3525             : 
    3526          78 :     if (!tableforest)
    3527             :     {
    3528          42 :         appendStringInfo(&result,
    3529             :                          "<xsd:complexType name=\"%s\">\n"
    3530             :                          "  <xsd:sequence>\n"
    3531             :                          "    <xsd:element name=\"row\" type=\"%s\" minOccurs=\"0\" maxOccurs=\"unbounded\"/>\n"
    3532             :                          "  </xsd:sequence>\n"
    3533             :                          "</xsd:complexType>\n\n",
    3534             :                          tabletypename, rowtypename);
    3535             : 
    3536          42 :         appendStringInfo(&result,
    3537             :                          "<xsd:element name=\"%s\" type=\"%s\"/>\n\n",
    3538             :                          xmltn, tabletypename);
    3539             :     }
    3540             :     else
    3541          36 :         appendStringInfo(&result,
    3542             :                          "<xsd:element name=\"%s\" type=\"%s\"/>\n\n",
    3543             :                          xmltn, rowtypename);
    3544             : 
    3545          78 :     xsd_schema_element_end(&result);
    3546             : 
    3547          78 :     return result.data;
    3548             : }
    3549             : 
    3550             : 
    3551             : /*
    3552             :  * Map an SQL schema to XML Schema data types; see SQL/XML:2008
    3553             :  * section 9.12.
    3554             :  */
    3555             : static const char *
    3556          18 : map_sql_schema_to_xmlschema_types(Oid nspid, List *relid_list, bool nulls,
    3557             :                                   bool tableforest, const char *targetns)
    3558             : {
    3559             :     char       *dbname;
    3560             :     char       *nspname;
    3561             :     char       *xmlsn;
    3562             :     char       *schematypename;
    3563             :     StringInfoData result;
    3564             :     ListCell   *cell;
    3565             : 
    3566          18 :     dbname = get_database_name(MyDatabaseId);
    3567          18 :     nspname = get_namespace_name(nspid);
    3568             : 
    3569          18 :     initStringInfo(&result);
    3570             : 
    3571          18 :     xmlsn = map_sql_identifier_to_xml_name(nspname, true, false);
    3572             : 
    3573          18 :     schematypename = map_multipart_sql_identifier_to_xml_name("SchemaType",
    3574             :                                                               dbname,
    3575             :                                                               nspname,
    3576             :                                                               NULL);
    3577             : 
    3578          18 :     appendStringInfo(&result,
    3579             :                      "<xsd:complexType name=\"%s\">\n", schematypename);
    3580          18 :     if (!tableforest)
    3581           6 :         appendStringInfoString(&result,
    3582             :                                "  <xsd:all>\n");
    3583             :     else
    3584          12 :         appendStringInfoString(&result,
    3585             :                                "  <xsd:sequence>\n");
    3586             : 
    3587          54 :     foreach(cell, relid_list)
    3588             :     {
    3589          36 :         Oid         relid = lfirst_oid(cell);
    3590          36 :         char       *relname = get_rel_name(relid);
    3591          36 :         char       *xmltn = map_sql_identifier_to_xml_name(relname, true, false);
    3592          36 :         char       *tabletypename = map_multipart_sql_identifier_to_xml_name(tableforest ? "RowType" : "TableType",
    3593             :                                                                              dbname,
    3594             :                                                                              nspname,
    3595             :                                                                              relname);
    3596             : 
    3597          36 :         if (!tableforest)
    3598          12 :             appendStringInfo(&result,
    3599             :                              "    <xsd:element name=\"%s\" type=\"%s\"/>\n",
    3600             :                              xmltn, tabletypename);
    3601             :         else
    3602          24 :             appendStringInfo(&result,
    3603             :                              "    <xsd:element name=\"%s\" type=\"%s\" minOccurs=\"0\" maxOccurs=\"unbounded\"/>\n",
    3604             :                              xmltn, tabletypename);
    3605             :     }
    3606             : 
    3607          18 :     if (!tableforest)
    3608           6 :         appendStringInfoString(&result,
    3609             :                                "  </xsd:all>\n");
    3610             :     else
    3611          12 :         appendStringInfoString(&result,
    3612             :                                "  </xsd:sequence>\n");
    3613          18 :     appendStringInfoString(&result,
    3614             :                            "</xsd:complexType>\n\n");
    3615             : 
    3616          18 :     appendStringInfo(&result,
    3617             :                      "<xsd:element name=\"%s\" type=\"%s\"/>\n\n",
    3618             :                      xmlsn, schematypename);
    3619             : 
    3620          18 :     return result.data;
    3621             : }
    3622             : 
    3623             : 
    3624             : /*
    3625             :  * Map an SQL catalog to XML Schema data types; see SQL/XML:2008
    3626             :  * section 9.15.
    3627             :  */
    3628             : static const char *
    3629           0 : map_sql_catalog_to_xmlschema_types(List *nspid_list, bool nulls,
    3630             :                                    bool tableforest, const char *targetns)
    3631             : {
    3632             :     char       *dbname;
    3633             :     char       *xmlcn;
    3634             :     char       *catalogtypename;
    3635             :     StringInfoData result;
    3636             :     ListCell   *cell;
    3637             : 
    3638           0 :     dbname = get_database_name(MyDatabaseId);
    3639             : 
    3640           0 :     initStringInfo(&result);
    3641             : 
    3642           0 :     xmlcn = map_sql_identifier_to_xml_name(dbname, true, false);
    3643             : 
    3644           0 :     catalogtypename = map_multipart_sql_identifier_to_xml_name("CatalogType",
    3645             :                                                                dbname,
    3646             :                                                                NULL,
    3647             :                                                                NULL);
    3648             : 
    3649           0 :     appendStringInfo(&result,
    3650             :                      "<xsd:complexType name=\"%s\">\n", catalogtypename);
    3651           0 :     appendStringInfoString(&result,
    3652             :                            "  <xsd:all>\n");
    3653             : 
    3654           0 :     foreach(cell, nspid_list)
    3655             :     {
    3656           0 :         Oid         nspid = lfirst_oid(cell);
    3657           0 :         char       *nspname = get_namespace_name(nspid);
    3658           0 :         char       *xmlsn = map_sql_identifier_to_xml_name(nspname, true, false);
    3659           0 :         char       *schematypename = map_multipart_sql_identifier_to_xml_name("SchemaType",
    3660             :                                                                               dbname,
    3661             :                                                                               nspname,
    3662             :                                                                               NULL);
    3663             : 
    3664           0 :         appendStringInfo(&result,
    3665             :                          "    <xsd:element name=\"%s\" type=\"%s\"/>\n",
    3666             :                          xmlsn, schematypename);
    3667             :     }
    3668             : 
    3669           0 :     appendStringInfoString(&result,
    3670             :                            "  </xsd:all>\n");
    3671           0 :     appendStringInfoString(&result,
    3672             :                            "</xsd:complexType>\n\n");
    3673             : 
    3674           0 :     appendStringInfo(&result,
    3675             :                      "<xsd:element name=\"%s\" type=\"%s\"/>\n\n",
    3676             :                      xmlcn, catalogtypename);
    3677             : 
    3678           0 :     return result.data;
    3679             : }
    3680             : 
    3681             : 
    3682             : /*
    3683             :  * Map an SQL data type to an XML name; see SQL/XML:2008 section 9.4.
    3684             :  */
    3685             : static const char *
    3686         810 : map_sql_type_to_xml_name(Oid typeoid, int typmod)
    3687             : {
    3688             :     StringInfoData result;
    3689             : 
    3690         810 :     initStringInfo(&result);
    3691             : 
    3692         810 :     switch (typeoid)
    3693             :     {
    3694          30 :         case BPCHAROID:
    3695          30 :             if (typmod == -1)
    3696          30 :                 appendStringInfoString(&result, "CHAR");
    3697             :             else
    3698           0 :                 appendStringInfo(&result, "CHAR_%d", typmod - VARHDRSZ);
    3699          30 :             break;
    3700          54 :         case VARCHAROID:
    3701          54 :             if (typmod == -1)
    3702          54 :                 appendStringInfoString(&result, "VARCHAR");
    3703             :             else
    3704           0 :                 appendStringInfo(&result, "VARCHAR_%d", typmod - VARHDRSZ);
    3705          54 :             break;
    3706          30 :         case NUMERICOID:
    3707          30 :             if (typmod == -1)
    3708          30 :                 appendStringInfoString(&result, "NUMERIC");
    3709             :             else
    3710           0 :                 appendStringInfo(&result, "NUMERIC_%d_%d",
    3711           0 :                                  ((typmod - VARHDRSZ) >> 16) & 0xffff,
    3712           0 :                                  (typmod - VARHDRSZ) & 0xffff);
    3713          30 :             break;
    3714         174 :         case INT4OID:
    3715         174 :             appendStringInfoString(&result, "INTEGER");
    3716         174 :             break;
    3717          30 :         case INT2OID:
    3718          30 :             appendStringInfoString(&result, "SMALLINT");
    3719          30 :             break;
    3720          30 :         case INT8OID:
    3721          30 :             appendStringInfoString(&result, "BIGINT");
    3722          30 :             break;
    3723          30 :         case FLOAT4OID:
    3724          30 :             appendStringInfoString(&result, "REAL");
    3725          30 :             break;
    3726           0 :         case FLOAT8OID:
    3727           0 :             appendStringInfoString(&result, "DOUBLE");
    3728           0 :             break;
    3729          30 :         case BOOLOID:
    3730          30 :             appendStringInfoString(&result, "BOOLEAN");
    3731          30 :             break;
    3732          30 :         case TIMEOID:
    3733          30 :             if (typmod == -1)
    3734          30 :                 appendStringInfoString(&result, "TIME");
    3735             :             else
    3736           0 :                 appendStringInfo(&result, "TIME_%d", typmod);
    3737          30 :             break;
    3738          30 :         case TIMETZOID:
    3739          30 :             if (typmod == -1)
    3740          30 :                 appendStringInfoString(&result, "TIME_WTZ");
    3741             :             else
    3742           0 :                 appendStringInfo(&result, "TIME_WTZ_%d", typmod);
    3743          30 :             break;
    3744          30 :         case TIMESTAMPOID:
    3745          30 :             if (typmod == -1)
    3746          30 :                 appendStringInfoString(&result, "TIMESTAMP");
    3747             :             else
    3748           0 :                 appendStringInfo(&result, "TIMESTAMP_%d", typmod);
    3749          30 :             break;
    3750          30 :         case TIMESTAMPTZOID:
    3751          30 :             if (typmod == -1)
    3752          30 :                 appendStringInfoString(&result, "TIMESTAMP_WTZ");
    3753             :             else
    3754           0 :                 appendStringInfo(&result, "TIMESTAMP_WTZ_%d", typmod);
    3755          30 :             break;
    3756          30 :         case DATEOID:
    3757          30 :             appendStringInfoString(&result, "DATE");
    3758          30 :             break;
    3759          30 :         case XMLOID:
    3760          30 :             appendStringInfoString(&result, "XML");
    3761          30 :             break;
    3762         222 :         default:
    3763             :             {
    3764             :                 HeapTuple   tuple;
    3765             :                 Form_pg_type typtuple;
    3766             : 
    3767         222 :                 tuple = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typeoid));
    3768         222 :                 if (!HeapTupleIsValid(tuple))
    3769           0 :                     elog(ERROR, "cache lookup failed for type %u", typeoid);
    3770         222 :                 typtuple = (Form_pg_type) GETSTRUCT(tuple);
    3771             : 
    3772         222 :                 appendStringInfoString(&result,
    3773         222 :                                        map_multipart_sql_identifier_to_xml_name((typtuple->typtype == TYPTYPE_DOMAIN) ? "Domain" : "UDT",
    3774         222 :                                                                                 get_database_name(MyDatabaseId),
    3775         222 :                                                                                 get_namespace_name(typtuple->typnamespace),
    3776         222 :                                                                                 NameStr(typtuple->typname)));
    3777             : 
    3778         222 :                 ReleaseSysCache(tuple);
    3779             :             }
    3780             :     }
    3781             : 
    3782         810 :     return result.data;
    3783             : }
    3784             : 
    3785             : 
    3786             : /*
    3787             :  * Map a collection of SQL data types to XML Schema data types; see
    3788             :  * SQL/XML:2008 section 9.7.
    3789             :  */
    3790             : static const char *
    3791          96 : map_sql_typecoll_to_xmlschema_types(List *tupdesc_list)
    3792             : {
    3793          96 :     List       *uniquetypes = NIL;
    3794             :     int         i;
    3795             :     StringInfoData result;
    3796             :     ListCell   *cell0;
    3797             : 
    3798             :     /* extract all column types used in the set of TupleDescs */
    3799         210 :     foreach(cell0, tupdesc_list)
    3800             :     {
    3801         114 :         TupleDesc   tupdesc = (TupleDesc) lfirst(cell0);
    3802             : 
    3803         702 :         for (i = 0; i < tupdesc->natts; i++)
    3804             :         {
    3805         588 :             Form_pg_attribute att = TupleDescAttr(tupdesc, i);
    3806             : 
    3807         588 :             if (att->attisdropped)
    3808          24 :                 continue;
    3809         564 :             uniquetypes = list_append_unique_oid(uniquetypes, att->atttypid);
    3810             :         }
    3811             :     }
    3812             : 
    3813             :     /* add base types of domains */
    3814         642 :     foreach(cell0, uniquetypes)
    3815             :     {
    3816         546 :         Oid         typid = lfirst_oid(cell0);
    3817         546 :         Oid         basetypid = getBaseType(typid);
    3818             : 
    3819         546 :         if (basetypid != typid)
    3820          24 :             uniquetypes = list_append_unique_oid(uniquetypes, basetypid);
    3821             :     }
    3822             : 
    3823             :     /* Convert to textual form */
    3824          96 :     initStringInfo(&result);
    3825             : 
    3826         642 :     foreach(cell0, uniquetypes)
    3827             :     {
    3828         546 :         appendStringInfo(&result, "%s\n",
    3829             :                          map_sql_type_to_xmlschema_type(lfirst_oid(cell0),
    3830             :                                                         -1));
    3831             :     }
    3832             : 
    3833          96 :     return result.data;
    3834             : }
    3835             : 
    3836             : 
    3837             : /*
    3838             :  * Map an SQL data type to a named XML Schema data type; see
    3839             :  * SQL/XML:2008 sections 9.5 and 9.6.
    3840             :  *
    3841             :  * (The distinction between 9.5 and 9.6 is basically that 9.6 adds
    3842             :  * a name attribute, which this function does.  The name-less version
    3843             :  * 9.5 doesn't appear to be required anywhere.)
    3844             :  */
    3845             : static const char *
    3846         546 : map_sql_type_to_xmlschema_type(Oid typeoid, int typmod)
    3847             : {
    3848             :     StringInfoData result;
    3849         546 :     const char *typename = map_sql_type_to_xml_name(typeoid, typmod);
    3850             : 
    3851         546 :     initStringInfo(&result);
    3852             : 
    3853         546 :     if (typeoid == XMLOID)
    3854             :     {
    3855          24 :         appendStringInfoString(&result,
    3856             :                                "<xsd:complexType mixed=\"true\">\n"
    3857             :                                "  <xsd:sequence>\n"
    3858             :                                "    <xsd:any name=\"element\" minOccurs=\"0\" maxOccurs=\"unbounded\" processContents=\"skip\"/>\n"
    3859             :                                "  </xsd:sequence>\n"
    3860             :                                "</xsd:complexType>\n");
    3861             :     }
    3862             :     else
    3863             :     {
    3864         522 :         appendStringInfo(&result,
    3865             :                          "<xsd:simpleType name=\"%s\">\n", typename);
    3866             : 
    3867         522 :         switch (typeoid)
    3868             :         {
    3869         138 :             case BPCHAROID:
    3870             :             case VARCHAROID:
    3871             :             case TEXTOID:
    3872         138 :                 appendStringInfoString(&result,
    3873             :                                        "  <xsd:restriction base=\"xsd:string\">\n");
    3874         138 :                 if (typmod != -1)
    3875           0 :                     appendStringInfo(&result,
    3876             :                                      "    <xsd:maxLength value=\"%d\"/>\n",
    3877             :                                      typmod - VARHDRSZ);
    3878         138 :                 appendStringInfoString(&result, "  </xsd:restriction>\n");
    3879         138 :                 break;
    3880             : 
    3881          24 :             case BYTEAOID:
    3882          24 :                 appendStringInfo(&result,
    3883             :                                  "  <xsd:restriction base=\"xsd:%s\">\n"
    3884             :                                  "  </xsd:restriction>\n",
    3885          24 :                                  xmlbinary == XMLBINARY_BASE64 ? "base64Binary" : "hexBinary");
    3886          24 :                 break;
    3887             : 
    3888          24 :             case NUMERICOID:
    3889          24 :                 if (typmod != -1)
    3890           0 :                     appendStringInfo(&result,
    3891             :                                      "  <xsd:restriction base=\"xsd:decimal\">\n"
    3892             :                                      "    <xsd:totalDigits value=\"%d\"/>\n"
    3893             :                                      "    <xsd:fractionDigits value=\"%d\"/>\n"
    3894             :                                      "  </xsd:restriction>\n",
    3895           0 :                                      ((typmod - VARHDRSZ) >> 16) & 0xffff,
    3896           0 :                                      (typmod - VARHDRSZ) & 0xffff);
    3897          24 :                 break;
    3898             : 
    3899          24 :             case INT2OID:
    3900          24 :                 appendStringInfo(&result,
    3901             :                                  "  <xsd:restriction base=\"xsd:short\">\n"
    3902             :                                  "    <xsd:maxInclusive value=\"%d\"/>\n"
    3903             :                                  "    <xsd:minInclusive value=\"%d\"/>\n"
    3904             :                                  "  </xsd:restriction>\n",
    3905             :                                  SHRT_MAX, SHRT_MIN);
    3906          24 :                 break;
    3907             : 
    3908          96 :             case INT4OID:
    3909          96 :                 appendStringInfo(&result,
    3910             :                                  "  <xsd:restriction base=\"xsd:int\">\n"
    3911             :                                  "    <xsd:maxInclusive value=\"%d\"/>\n"
    3912             :                                  "    <xsd:minInclusive value=\"%d\"/>\n"
    3913             :                                  "  </xsd:restriction>\n",
    3914             :                                  INT_MAX, INT_MIN);
    3915          96 :                 break;
    3916             : 
    3917          24 :             case INT8OID:
    3918          24 :                 appendStringInfo(&result,
    3919             :                                  "  <xsd:restriction base=\"xsd:long\">\n"
    3920             :                                  "    <xsd:maxInclusive value=\"" INT64_FORMAT "\"/>\n"
    3921             :                                  "    <xsd:minInclusive value=\"" INT64_FORMAT "\"/>\n"
    3922             :                                  "  </xsd:restriction>\n",
    3923             :                                  PG_INT64_MAX,
    3924             :                                  PG_INT64_MIN);
    3925          24 :                 break;
    3926             : 
    3927          24 :             case FLOAT4OID:
    3928          24 :                 appendStringInfoString(&result,
    3929             :                                        "  <xsd:restriction base=\"xsd:float\"></xsd:restriction>\n");
    3930          24 :                 break;
    3931             : 
    3932           0 :             case FLOAT8OID:
    3933           0 :                 appendStringInfoString(&result,
    3934             :                                        "  <xsd:restriction base=\"xsd:double\"></xsd:restriction>\n");
    3935           0 :                 break;
    3936             : 
    3937          24 :             case BOOLOID:
    3938          24 :                 appendStringInfoString(&result,
    3939             :                                        "  <xsd:restriction base=\"xsd:boolean\"></xsd:restriction>\n");
    3940          24 :                 break;
    3941             : 
    3942          48 :             case TIMEOID:
    3943             :             case TIMETZOID:
    3944             :                 {
    3945          48 :                     const char *tz = (typeoid == TIMETZOID ? "(\\+|-)\\p{Nd}{2}:\\p{Nd}{2}" : "");
    3946             : 
    3947          48 :                     if (typmod == -1)
    3948          48 :                         appendStringInfo(&result,
    3949             :                                          "  <xsd:restriction base=\"xsd:time\">\n"
    3950             :                                          "    <xsd:pattern value=\"\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}(.\\p{Nd}+)?%s\"/>\n"
    3951             :                                          "  </xsd:restriction>\n", tz);
    3952           0 :                     else if (typmod == 0)
    3953           0 :                         appendStringInfo(&result,
    3954             :                                          "  <xsd:restriction base=\"xsd:time\">\n"
    3955             :                                          "    <xsd:pattern value=\"\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}%s\"/>\n"
    3956             :                                          "  </xsd:restriction>\n", tz);
    3957             :                     else
    3958           0 :                         appendStringInfo(&result,
    3959             :                                          "  <xsd:restriction base=\"xsd:time\">\n"
    3960             :                                          "    <xsd:pattern value=\"\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}.\\p{Nd}{%d}%s\"/>\n"
    3961             :                                          "  </xsd:restriction>\n", typmod - VARHDRSZ, tz);
    3962          48 :                     break;
    3963             :                 }
    3964             : 
    3965          48 :             case TIMESTAMPOID:
    3966             :             case TIMESTAMPTZOID:
    3967             :                 {
    3968          48 :                     const char *tz = (typeoid == TIMESTAMPTZOID ? "(\\+|-)\\p{Nd}{2}:\\p{Nd}{2}" : "");
    3969             : 
    3970          48 :                     if (typmod == -1)
    3971          48 :                         appendStringInfo(&result,
    3972             :                                          "  <xsd:restriction base=\"xsd:dateTime\">\n"
    3973             :                                          "    <xsd:pattern value=\"\\p{Nd}{4}-\\p{Nd}{2}-\\p{Nd}{2}T\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}(.\\p{Nd}+)?%s\"/>\n"
    3974             :                                          "  </xsd:restriction>\n", tz);
    3975           0 :                     else if (typmod == 0)
    3976           0 :                         appendStringInfo(&result,
    3977             :                                          "  <xsd:restriction base=\"xsd:dateTime\">\n"
    3978             :                                          "    <xsd:pattern value=\"\\p{Nd}{4}-\\p{Nd}{2}-\\p{Nd}{2}T\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}%s\"/>\n"
    3979             :                                          "  </xsd:restriction>\n", tz);
    3980             :                     else
    3981           0 :                         appendStringInfo(&result,
    3982             :                                          "  <xsd:restriction base=\"xsd:dateTime\">\n"
    3983             :                                          "    <xsd:pattern value=\"\\p{Nd}{4}-\\p{Nd}{2}-\\p{Nd}{2}T\\p{Nd}{2}:\\p{Nd}{2}:\\p{Nd}{2}.\\p{Nd}{%d}%s\"/>\n"
    3984             :                                          "  </xsd:restriction>\n", typmod - VARHDRSZ, tz);
    3985          48 :                     break;
    3986             :                 }
    3987             : 
    3988          24 :             case DATEOID:
    3989          24 :                 appendStringInfoString(&result,
    3990             :                                        "  <xsd:restriction base=\"xsd:date\">\n"
    3991             :                                        "    <xsd:pattern value=\"\\p{Nd}{4}-\\p{Nd}{2}-\\p{Nd}{2}\"/>\n"
    3992             :                                        "  </xsd:restriction>\n");
    3993          24 :                 break;
    3994             : 
    3995          24 :             default:
    3996          24 :                 if (get_typtype(typeoid) == TYPTYPE_DOMAIN)
    3997             :                 {
    3998             :                     Oid         base_typeoid;
    3999          24 :                     int32       base_typmod = -1;
    4000             : 
    4001          24 :                     base_typeoid = getBaseTypeAndTypmod(typeoid, &base_typmod);
    4002             : 
    4003          24 :                     appendStringInfo(&result,
    4004             :                                      "  <xsd:restriction base=\"%s\"/>\n",
    4005             :                                      map_sql_type_to_xml_name(base_typeoid, base_typmod));
    4006             :                 }
    4007          24 :                 break;
    4008             :         }
    4009         522 :         appendStringInfoString(&result, "</xsd:simpleType>\n");
    4010             :     }
    4011             : 
    4012         546 :     return result.data;
    4013             : }
    4014             : 
    4015             : 
    4016             : /*
    4017             :  * Map an SQL row to an XML element, taking the row from the active
    4018             :  * SPI cursor.  See also SQL/XML:2008 section 9.10.
    4019             :  */
    4020             : static void
    4021         312 : SPI_sql_row_to_xmlelement(uint64 rownum, StringInfo result, char *tablename,
    4022             :                           bool nulls, bool tableforest,
    4023             :                           const char *targetns, bool top_level)
    4024             : {
    4025             :     int         i;
    4026             :     char       *xmltn;
    4027             : 
    4028         312 :     if (tablename)
    4029         228 :         xmltn = map_sql_identifier_to_xml_name(tablename, true, false);
    4030             :     else
    4031             :     {
    4032          84 :         if (tableforest)
    4033          36 :             xmltn = "row";
    4034             :         else
    4035          48 :             xmltn = "table";
    4036             :     }
    4037             : 
    4038         312 :     if (tableforest)
    4039         162 :         xmldata_root_element_start(result, xmltn, NULL, targetns, top_level);
    4040             :     else
    4041         150 :         appendStringInfoString(result, "<row>\n");
    4042             : 
    4043        1272 :     for (i = 1; i <= SPI_tuptable->tupdesc->natts; i++)
    4044             :     {
    4045             :         char       *colname;
    4046             :         Datum       colval;
    4047             :         bool        isnull;
    4048             : 
    4049         960 :         colname = map_sql_identifier_to_xml_name(SPI_fname(SPI_tuptable->tupdesc, i),
    4050             :                                                  true, false);
    4051         960 :         colval = SPI_getbinval(SPI_tuptable->vals[rownum],
    4052         960 :                                SPI_tuptable->tupdesc,
    4053             :                                i,
    4054             :                                &isnull);
    4055         960 :         if (isnull)
    4056             :         {
    4057         114 :             if (nulls)
    4058          60 :                 appendStringInfo(result, "  <%s xsi:nil=\"true\"/>\n", colname);
    4059             :         }
    4060             :         else
    4061         846 :             appendStringInfo(result, "  <%s>%s</%s>\n",
    4062             :                              colname,
    4063             :                              map_sql_value_to_xml_value(colval,
    4064         846 :                                                         SPI_gettypeid(SPI_tuptable->tupdesc, i), true),
    4065             :                              colname);
    4066             :     }
    4067             : 
    4068         312 :     if (tableforest)
    4069             :     {
    4070         162 :         xmldata_root_element_end(result, xmltn);
    4071         162 :         appendStringInfoChar(result, '\n');
    4072             :     }
    4073             :     else
    4074         150 :         appendStringInfoString(result, "</row>\n\n");
    4075         312 : }
    4076             : 
    4077             : 
    4078             : /*
    4079             :  * XPath related functions
    4080             :  */
    4081             : 
    4082             : #ifdef USE_LIBXML
    4083             : 
    4084             : /*
    4085             :  * Convert XML node to text.
    4086             :  *
    4087             :  * For attribute and text nodes, return the escaped text.  For anything else,
    4088             :  * dump the whole subtree.
    4089             :  */
    4090             : static text *
    4091         192 : xml_xmlnodetoxmltype(xmlNodePtr cur, PgXmlErrorContext *xmlerrcxt)
    4092             : {
    4093         192 :     xmltype    *result = NULL;
    4094             : 
    4095         192 :     if (cur->type != XML_ATTRIBUTE_NODE && cur->type != XML_TEXT_NODE)
    4096         162 :     {
    4097         162 :         void        (*volatile nodefree) (xmlNodePtr) = NULL;
    4098         162 :         volatile xmlBufferPtr buf = NULL;
    4099         162 :         volatile xmlNodePtr cur_copy = NULL;
    4100             : 
    4101         162 :         PG_TRY();
    4102             :         {
    4103             :             int         bytes;
    4104             : 
    4105         162 :             buf = xmlBufferCreate();
    4106         162 :             if (buf == NULL || xmlerrcxt->err_occurred)
    4107           0 :                 xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
    4108             :                             "could not allocate xmlBuffer");
    4109             : 
    4110             :             /*
    4111             :              * Produce a dump of the node that we can serialize.  xmlNodeDump
    4112             :              * does that, but the result of that function won't contain
    4113             :              * namespace definitions from ancestor nodes, so we first do a
    4114             :              * xmlCopyNode() which duplicates the node along with its required
    4115             :              * namespace definitions.
    4116             :              *
    4117             :              * Some old libxml2 versions such as 2.7.6 produce partially
    4118             :              * broken XML_DOCUMENT_NODE nodes (unset content field) when
    4119             :              * copying them.  xmlNodeDump of such a node works fine, but
    4120             :              * xmlFreeNode crashes; set us up to call xmlFreeDoc instead.
    4121             :              */
    4122         162 :             cur_copy = xmlCopyNode(cur, 1);
    4123         162 :             if (cur_copy == NULL || xmlerrcxt->err_occurred)
    4124           0 :                 xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
    4125             :                             "could not copy node");
    4126         324 :             nodefree = (cur_copy->type == XML_DOCUMENT_NODE) ?
    4127         162 :                 (void (*) (xmlNodePtr)) xmlFreeDoc : xmlFreeNode;
    4128             : 
    4129         162 :             bytes = xmlNodeDump(buf, NULL, cur_copy, 0, 0);
    4130         162 :             if (bytes == -1 || xmlerrcxt->err_occurred)
    4131           0 :                 xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
    4132             :                             "could not dump node");
    4133             : 
    4134         162 :             result = xmlBuffer_to_xmltype(buf);
    4135             :         }
    4136           0 :         PG_FINALLY();
    4137             :         {
    4138         162 :             if (nodefree)
    4139         162 :                 nodefree(cur_copy);
    4140         162 :             if (buf)
    4141         162 :                 xmlBufferFree(buf);
    4142             :         }
    4143         162 :         PG_END_TRY();
    4144             :     }
    4145             :     else
    4146             :     {
    4147             :         xmlChar    *str;
    4148             : 
    4149          30 :         str = xmlXPathCastNodeToString(cur);
    4150          30 :         PG_TRY();
    4151             :         {
    4152             :             /* Here we rely on XML having the same representation as TEXT */
    4153          30 :             char       *escaped = escape_xml((char *) str);
    4154             : 
    4155          30 :             result = (xmltype *) cstring_to_text(escaped);
    4156          30 :             pfree(escaped);
    4157             :         }
    4158           0 :         PG_FINALLY();
    4159             :         {
    4160          30 :             xmlFree(str);
    4161             :         }
    4162          30 :         PG_END_TRY();
    4163             :     }
    4164             : 
    4165         192 :     return result;
    4166             : }
    4167             : 
    4168             : /*
    4169             :  * Convert an XML XPath object (the result of evaluating an XPath expression)
    4170             :  * to an array of xml values, which are appended to astate.  The function
    4171             :  * result value is the number of elements in the array.
    4172             :  *
    4173             :  * If "astate" is NULL then we don't generate the array value, but we still
    4174             :  * return the number of elements it would have had.
    4175             :  *
    4176             :  * Nodesets are converted to an array containing the nodes' textual
    4177             :  * representations.  Primitive values (float, double, string) are converted
    4178             :  * to a single-element array containing the value's string representation.
    4179             :  */
    4180             : static int
    4181         540 : xml_xpathobjtoxmlarray(xmlXPathObjectPtr xpathobj,
    4182             :                        ArrayBuildState *astate,
    4183             :                        PgXmlErrorContext *xmlerrcxt)
    4184             : {
    4185         540 :     int         result = 0;
    4186             :     Datum       datum;
    4187             :     Oid         datumtype;
    4188             :     char       *result_str;
    4189             : 
    4190         540 :     switch (xpathobj->type)
    4191             :     {
    4192         498 :         case XPATH_NODESET:
    4193         498 :             if (xpathobj->nodesetval != NULL)
    4194             :             {
    4195         354 :                 result = xpathobj->nodesetval->nodeNr;
    4196         354 :                 if (astate != NULL)
    4197             :                 {
    4198             :                     int         i;
    4199             : 
    4200         168 :                     for (i = 0; i < result; i++)
    4201             :                     {
    4202          90 :                         datum = PointerGetDatum(xml_xmlnodetoxmltype(xpathobj->nodesetval->nodeTab[i],
    4203             :                                                                      xmlerrcxt));
    4204          90 :                         (void) accumArrayResult(astate, datum, false,
    4205             :                                                 XMLOID, CurrentMemoryContext);
    4206             :                     }
    4207             :                 }
    4208             :             }
    4209         498 :             return result;
    4210             : 
    4211          12 :         case XPATH_BOOLEAN:
    4212          12 :             if (astate == NULL)
    4213           0 :                 return 1;
    4214          12 :             datum = BoolGetDatum(xpathobj->boolval);
    4215          12 :             datumtype = BOOLOID;
    4216          12 :             break;
    4217             : 
    4218          18 :         case XPATH_NUMBER:
    4219          18 :             if (astate == NULL)
    4220          12 :                 return 1;
    4221           6 :             datum = Float8GetDatum(xpathobj->floatval);
    4222           6 :             datumtype = FLOAT8OID;
    4223           6 :             break;
    4224             : 
    4225          12 :         case XPATH_STRING:
    4226          12 :             if (astate == NULL)
    4227           0 :                 return 1;
    4228          12 :             datum = CStringGetDatum((char *) xpathobj->stringval);
    4229          12 :             datumtype = CSTRINGOID;
    4230          12 :             break;
    4231             : 
    4232           0 :         default:
    4233           0 :             elog(ERROR, "xpath expression result type %d is unsupported",
    4234             :                  xpathobj->type);
    4235             :             return 0;           /* keep compiler quiet */
    4236             :     }
    4237             : 
    4238             :     /* Common code for scalar-value cases */
    4239          30 :     result_str = map_sql_value_to_xml_value(datum, datumtype, true);
    4240          30 :     datum = PointerGetDatum(cstring_to_xmltype(result_str));
    4241          30 :     (void) accumArrayResult(astate, datum, false,
    4242             :                             XMLOID, CurrentMemoryContext);
    4243          30 :     return 1;
    4244             : }
    4245             : 
    4246             : 
    4247             : /*
    4248             :  * Common code for xpath() and xmlexists()
    4249             :  *
    4250             :  * Evaluate XPath expression and return number of nodes in res_nitems
    4251             :  * and array of XML values in astate.  Either of those pointers can be
    4252             :  * NULL if the corresponding result isn't wanted.
    4253             :  *
    4254             :  * It is up to the user to ensure that the XML passed is in fact
    4255             :  * an XML document - XPath doesn't work easily on fragments without
    4256             :  * a context node being known.
    4257             :  */
    4258             : static void
    4259         558 : xpath_internal(text *xpath_expr_text, xmltype *data, ArrayType *namespaces,
    4260             :                int *res_nitems, ArrayBuildState *astate)
    4261             : {
    4262             :     PgXmlErrorContext *xmlerrcxt;
    4263         558 :     volatile xmlParserCtxtPtr ctxt = NULL;
    4264         558 :     volatile xmlDocPtr doc = NULL;
    4265         558 :     volatile xmlXPathContextPtr xpathctx = NULL;
    4266         558 :     volatile xmlXPathCompExprPtr xpathcomp = NULL;
    4267         558 :     volatile xmlXPathObjectPtr xpathobj = NULL;
    4268             :     char       *datastr;
    4269             :     int32       len;
    4270             :     int32       xpath_len;
    4271             :     xmlChar    *string;
    4272             :     xmlChar    *xpath_expr;
    4273         558 :     size_t      xmldecl_len = 0;
    4274             :     int         i;
    4275             :     int         ndim;
    4276             :     Datum      *ns_names_uris;
    4277             :     bool       *ns_names_uris_nulls;
    4278             :     int         ns_count;
    4279             : 
    4280             :     /*
    4281             :      * Namespace mappings are passed as text[].  If an empty array is passed
    4282             :      * (ndim = 0, "0-dimensional"), then there are no namespace mappings.
    4283             :      * Else, a 2-dimensional array with length of the second axis being equal
    4284             :      * to 2 should be passed, i.e., every subarray contains 2 elements, the
    4285             :      * first element defining the name, the second one the URI.  Example:
    4286             :      * ARRAY[ARRAY['myns', 'http://example.com'], ARRAY['myns2',
    4287             :      * 'http://example2.com']].
    4288             :      */
    4289         558 :     ndim = namespaces ? ARR_NDIM(namespaces) : 0;
    4290         558 :     if (ndim != 0)
    4291             :     {
    4292             :         int        *dims;
    4293             : 
    4294         126 :         dims = ARR_DIMS(namespaces);
    4295             : 
    4296         126 :         if (ndim != 2 || dims[1] != 2)
    4297           0 :             ereport(ERROR,
    4298             :                     (errcode(ERRCODE_DATA_EXCEPTION),
    4299             :                      errmsg("invalid array for XML namespace mapping"),
    4300             :                      errdetail("The array must be two-dimensional with length of the second axis equal to 2.")));
    4301             : 
    4302             :         Assert(ARR_ELEMTYPE(namespaces) == TEXTOID);
    4303             : 
    4304         126 :         deconstruct_array_builtin(namespaces, TEXTOID,
    4305             :                                   &ns_names_uris, &ns_names_uris_nulls,
    4306             :                                   &ns_count);
    4307             : 
    4308             :         Assert((ns_count % 2) == 0);    /* checked above */
    4309         126 :         ns_count /= 2;          /* count pairs only */
    4310             :     }
    4311             :     else
    4312             :     {
    4313         432 :         ns_names_uris = NULL;
    4314         432 :         ns_names_uris_nulls = NULL;
    4315         432 :         ns_count = 0;
    4316             :     }
    4317             : 
    4318         558 :     datastr = VARDATA(data);
    4319         558 :     len = VARSIZE(data) - VARHDRSZ;
    4320         558 :     xpath_len = VARSIZE_ANY_EXHDR(xpath_expr_text);
    4321         558 :     if (xpath_len == 0)
    4322           6 :         ereport(ERROR,
    4323             :                 (errcode(ERRCODE_DATA_EXCEPTION),
    4324             :                  errmsg("empty XPath expression")));
    4325             : 
    4326         552 :     string = pg_xmlCharStrndup(datastr, len);
    4327         552 :     xpath_expr = pg_xmlCharStrndup(VARDATA_ANY(xpath_expr_text), xpath_len);
    4328             : 
    4329             :     /*
    4330             :      * In a UTF8 database, skip any xml declaration, which might assert
    4331             :      * another encoding.  Ignore parse_xml_decl() failure, letting
    4332             :      * xmlCtxtReadMemory() report parse errors.  Documentation disclaims
    4333             :      * xpath() support for non-ASCII data in non-UTF8 databases, so leave
    4334             :      * those scenarios bug-compatible with historical behavior.
    4335             :      */
    4336         552 :     if (GetDatabaseEncoding() == PG_UTF8)
    4337         552 :         parse_xml_decl(string, &xmldecl_len, NULL, NULL, NULL);
    4338             : 
    4339         552 :     xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_ALL);
    4340             : 
    4341         552 :     PG_TRY();
    4342             :     {
    4343         552 :         xmlInitParser();
    4344             : 
    4345             :         /*
    4346             :          * redundant XML parsing (two parsings for the same value during one
    4347             :          * command execution are possible)
    4348             :          */
    4349         552 :         ctxt = xmlNewParserCtxt();
    4350         552 :         if (ctxt == NULL || xmlerrcxt->err_occurred)
    4351           0 :             xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
    4352             :                         "could not allocate parser context");
    4353        1104 :         doc = xmlCtxtReadMemory(ctxt, (char *) string + xmldecl_len,
    4354         552 :                                 len - xmldecl_len, NULL, NULL, 0);
    4355         552 :         if (doc == NULL || xmlerrcxt->err_occurred)
    4356          12 :             xml_ereport(xmlerrcxt, ERROR, ERRCODE_INVALID_XML_DOCUMENT,
    4357             :                         "could not parse XML document");
    4358         540 :         xpathctx = xmlXPathNewContext(doc);
    4359         540 :         if (xpathctx == NULL || xmlerrcxt->err_occurred)
    4360           0 :             xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
    4361             :                         "could not allocate XPath context");
    4362         540 :         xpathctx->node = (xmlNodePtr) doc;
    4363             : 
    4364             :         /* register namespaces, if any */
    4365         540 :         if (ns_count > 0)
    4366             :         {
    4367         252 :             for (i = 0; i < ns_count; i++)
    4368             :             {
    4369             :                 char       *ns_name;
    4370             :                 char       *ns_uri;
    4371             : 
    4372         126 :                 if (ns_names_uris_nulls[i * 2] ||
    4373         126 :                     ns_names_uris_nulls[i * 2 + 1])
    4374           0 :                     ereport(ERROR,
    4375             :                             (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
    4376             :                              errmsg("neither namespace name nor URI may be null")));
    4377         126 :                 ns_name = TextDatumGetCString(ns_names_uris[i * 2]);
    4378         126 :                 ns_uri = TextDatumGetCString(ns_names_uris[i * 2 + 1]);
    4379         126 :                 if (xmlXPathRegisterNs(xpathctx,
    4380             :                                        (xmlChar *) ns_name,
    4381             :                                        (xmlChar *) ns_uri) != 0)
    4382           0 :                     ereport(ERROR,  /* is this an internal error??? */
    4383             :                             (errmsg("could not register XML namespace with name \"%s\" and URI \"%s\"",
    4384             :                                     ns_name, ns_uri)));
    4385             :             }
    4386             :         }
    4387             : 
    4388         540 :         xpathcomp = xmlXPathCompile(xpath_expr);
    4389         540 :         if (xpathcomp == NULL || xmlerrcxt->err_occurred)
    4390           0 :             xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
    4391             :                         "invalid XPath expression");
    4392             : 
    4393             :         /*
    4394             :          * Version 2.6.27 introduces a function named
    4395             :          * xmlXPathCompiledEvalToBoolean, which would be enough for xmlexists,
    4396             :          * but we can derive the existence by whether any nodes are returned,
    4397             :          * thereby preventing a library version upgrade and keeping the code
    4398             :          * the same.
    4399             :          */
    4400         540 :         xpathobj = xmlXPathCompiledEval(xpathcomp, xpathctx);
    4401         540 :         if (xpathobj == NULL || xmlerrcxt->err_occurred)
    4402           0 :             xml_ereport(xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
    4403             :                         "could not create XPath object");
    4404             : 
    4405             :         /*
    4406             :          * Extract the results as requested.
    4407             :          */
    4408         540 :         if (res_nitems != NULL)
    4409         432 :             *res_nitems = xml_xpathobjtoxmlarray(xpathobj, astate, xmlerrcxt);
    4410             :         else
    4411         108 :             (void) xml_xpathobjtoxmlarray(xpathobj, astate, xmlerrcxt);
    4412             :     }
    4413          12 :     PG_CATCH();
    4414             :     {
    4415          12 :         if (xpathobj)
    4416           0 :             xmlXPathFreeObject(xpathobj);
    4417          12 :         if (xpathcomp)
    4418           0 :             xmlXPathFreeCompExpr(xpathcomp);
    4419          12 :         if (xpathctx)
    4420           0 :             xmlXPathFreeContext(xpathctx);
    4421          12 :         if (doc)
    4422          12 :             xmlFreeDoc(doc);
    4423          12 :         if (ctxt)
    4424          12 :             xmlFreeParserCtxt(ctxt);
    4425             : 
    4426          12 :         pg_xml_done(xmlerrcxt, true);
    4427             : 
    4428          12 :         PG_RE_THROW();
    4429             :     }
    4430         540 :     PG_END_TRY();
    4431             : 
    4432         540 :     xmlXPathFreeObject(xpathobj);
    4433         540 :     xmlXPathFreeCompExpr(xpathcomp);
    4434         540 :     xmlXPathFreeContext(xpathctx);
    4435         540 :     xmlFreeDoc(doc);
    4436         540 :     xmlFreeParserCtxt(ctxt);
    4437             : 
    4438         540 :     pg_xml_done(xmlerrcxt, false);
    4439         540 : }
    4440             : #endif                          /* USE_LIBXML */
    4441             : 
    4442             : /*
    4443             :  * Evaluate XPath expression and return array of XML values.
    4444             :  *
    4445             :  * As we have no support of XQuery sequences yet, this function seems
    4446             :  * to be the most useful one (array of XML functions plays a role of
    4447             :  * some kind of substitution for XQuery sequences).
    4448             :  */
    4449             : Datum
    4450         126 : xpath(PG_FUNCTION_ARGS)
    4451             : {
    4452             : #ifdef USE_LIBXML
    4453         126 :     text       *xpath_expr_text = PG_GETARG_TEXT_PP(0);
    4454         126 :     xmltype    *data = PG_GETARG_XML_P(1);
    4455         126 :     ArrayType  *namespaces = PG_GETARG_ARRAYTYPE_P(2);
    4456             :     ArrayBuildState *astate;
    4457             : 
    4458         126 :     astate = initArrayResult(XMLOID, CurrentMemoryContext, true);
    4459         126 :     xpath_internal(xpath_expr_text, data, namespaces,
    4460             :                    NULL, astate);
    4461         108 :     PG_RETURN_DATUM(makeArrayResult(astate, CurrentMemoryContext));
    4462             : #else
    4463             :     NO_XML_SUPPORT();
    4464             :     return 0;
    4465             : #endif
    4466             : }
    4467             : 
    4468             : /*
    4469             :  * Determines if the node specified by the supplied XPath exists
    4470             :  * in a given XML document, returning a boolean.
    4471             :  */
    4472             : Datum
    4473         198 : xmlexists(PG_FUNCTION_ARGS)
    4474             : {
    4475             : #ifdef USE_LIBXML
    4476         198 :     text       *xpath_expr_text = PG_GETARG_TEXT_PP(0);
    4477         198 :     xmltype    *data = PG_GETARG_XML_P(1);
    4478             :     int         res_nitems;
    4479             : 
    4480         198 :     xpath_internal(xpath_expr_text, data, NULL,
    4481             :                    &res_nitems, NULL);
    4482             : 
    4483         198 :     PG_RETURN_BOOL(res_nitems > 0);
    4484             : #else
    4485             :     NO_XML_SUPPORT();
    4486             :     return 0;
    4487             : #endif
    4488             : }
    4489             : 
    4490             : /*
    4491             :  * Determines if the node specified by the supplied XPath exists
    4492             :  * in a given XML document, returning a boolean. Differs from
    4493             :  * xmlexists as it supports namespaces and is not defined in SQL/XML.
    4494             :  */
    4495             : Datum
    4496         234 : xpath_exists(PG_FUNCTION_ARGS)
    4497             : {
    4498             : #ifdef USE_LIBXML
    4499         234 :     text       *xpath_expr_text = PG_GETARG_TEXT_PP(0);
    4500         234 :     xmltype    *data = PG_GETARG_XML_P(1);
    4501         234 :     ArrayType  *namespaces = PG_GETARG_ARRAYTYPE_P(2);
    4502             :     int         res_nitems;
    4503             : 
    4504         234 :     xpath_internal(xpath_expr_text, data, namespaces,
    4505             :                    &res_nitems, NULL);
    4506             : 
    4507         234 :     PG_RETURN_BOOL(res_nitems > 0);
    4508             : #else
    4509             :     NO_XML_SUPPORT();
    4510             :     return 0;
    4511             : #endif
    4512             : }
    4513             : 
    4514             : /*
    4515             :  * Functions for checking well-formed-ness
    4516             :  */
    4517             : 
    4518             : #ifdef USE_LIBXML
    4519             : static bool
    4520         114 : wellformed_xml(text *data, XmlOptionType xmloption_arg)
    4521             : {
    4522             :     xmlDocPtr   doc;
    4523         114 :     ErrorSaveContext escontext = {T_ErrorSaveContext};
    4524             : 
    4525             :     /*
    4526             :      * We'll report "true" if no soft error is reported by xml_parse().
    4527             :      */
    4528         114 :     doc = xml_parse(data, xmloption_arg, true,
    4529             :                     GetDatabaseEncoding(), NULL, NULL, (Node *) &escontext);
    4530         114 :     if (doc)
    4531          60 :         xmlFreeDoc(doc);
    4532             : 
    4533         114 :     return !escontext.error_occurred;
    4534             : }
    4535             : #endif
    4536             : 
    4537             : Datum
    4538          90 : xml_is_well_formed(PG_FUNCTION_ARGS)
    4539             : {
    4540             : #ifdef USE_LIBXML
    4541          90 :     text       *data = PG_GETARG_TEXT_PP(0);
    4542             : 
    4543          90 :     PG_RETURN_BOOL(wellformed_xml(data, xmloption));
    4544             : #else
    4545             :     NO_XML_SUPPORT();
    4546             :     return 0;
    4547             : #endif                          /* not USE_LIBXML */
    4548             : }
    4549             : 
    4550             : Datum
    4551          12 : xml_is_well_formed_document(PG_FUNCTION_ARGS)
    4552             : {
    4553             : #ifdef USE_LIBXML
    4554          12 :     text       *data = PG_GETARG_TEXT_PP(0);
    4555             : 
    4556          12 :     PG_RETURN_BOOL(wellformed_xml(data, XMLOPTION_DOCUMENT));
    4557             : #else
    4558             :     NO_XML_SUPPORT();
    4559             :     return 0;
    4560             : #endif                          /* not USE_LIBXML */
    4561             : }
    4562             : 
    4563             : Datum
    4564          12 : xml_is_well_formed_content(PG_FUNCTION_ARGS)
    4565             : {
    4566             : #ifdef USE_LIBXML
    4567          12 :     text       *data = PG_GETARG_TEXT_PP(0);
    4568             : 
    4569          12 :     PG_RETURN_BOOL(wellformed_xml(data, XMLOPTION_CONTENT));
    4570             : #else
    4571             :     NO_XML_SUPPORT();
    4572             :     return 0;
    4573             : #endif                          /* not USE_LIBXML */
    4574             : }
    4575             : 
    4576             : /*
    4577             :  * support functions for XMLTABLE
    4578             :  *
    4579             :  */
    4580             : #ifdef USE_LIBXML
    4581             : 
    4582             : /*
    4583             :  * Returns private data from executor state. Ensure validity by check with
    4584             :  * MAGIC number.
    4585             :  */
    4586             : static inline XmlTableBuilderData *
    4587      154936 : GetXmlTableBuilderPrivateData(TableFuncScanState *state, const char *fname)
    4588             : {
    4589             :     XmlTableBuilderData *result;
    4590             : 
    4591      154936 :     if (!IsA(state, TableFuncScanState))
    4592           0 :         elog(ERROR, "%s called with invalid TableFuncScanState", fname);
    4593      154936 :     result = (XmlTableBuilderData *) state->opaque;
    4594      154936 :     if (result->magic != XMLTABLE_CONTEXT_MAGIC)
    4595           0 :         elog(ERROR, "%s called with invalid TableFuncScanState", fname);
    4596             : 
    4597      154936 :     return result;
    4598             : }
    4599             : #endif
    4600             : 
    4601             : /*
    4602             :  * XmlTableInitOpaque
    4603             :  *      Fill in TableFuncScanState->opaque for XmlTable processor; initialize
    4604             :  *      the XML parser.
    4605             :  *
    4606             :  * Note: Because we call pg_xml_init() here and pg_xml_done() in
    4607             :  * XmlTableDestroyOpaque, it is critical for robustness that no other
    4608             :  * executor nodes run until this node is processed to completion.  Caller
    4609             :  * must execute this to completion (probably filling a tuplestore to exhaust
    4610             :  * this node in a single pass) instead of using row-per-call mode.
    4611             :  */
    4612             : static void
    4613         264 : XmlTableInitOpaque(TableFuncScanState *state, int natts)
    4614             : {
    4615             : #ifdef USE_LIBXML
    4616         264 :     volatile xmlParserCtxtPtr ctxt = NULL;
    4617             :     XmlTableBuilderData *xtCxt;
    4618             :     PgXmlErrorContext *xmlerrcxt;
    4619             : 
    4620         264 :     xtCxt = palloc0(sizeof(XmlTableBuilderData));
    4621         264 :     xtCxt->magic = XMLTABLE_CONTEXT_MAGIC;
    4622         264 :     xtCxt->natts = natts;
    4623         264 :     xtCxt->xpathscomp = palloc0(sizeof(xmlXPathCompExprPtr) * natts);
    4624             : 
    4625         264 :     xmlerrcxt = pg_xml_init(PG_XML_STRICTNESS_ALL);
    4626             : 
    4627         264 :     PG_TRY();
    4628             :     {
    4629         264 :         xmlInitParser();
    4630             : 
    4631         264 :         ctxt = xmlNewParserCtxt();
    4632         264 :         if (ctxt == NULL || xmlerrcxt->err_occurred)
    4633           0 :             xml_ereport(xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
    4634             :                         "could not allocate parser context");
    4635             :     }
    4636           0 :     PG_CATCH();
    4637             :     {
    4638           0 :         if (ctxt != NULL)
    4639           0 :             xmlFreeParserCtxt(ctxt);
    4640             : 
    4641           0 :         pg_xml_done(xmlerrcxt, true);
    4642             : 
    4643           0 :         PG_RE_THROW();
    4644             :     }
    4645         264 :     PG_END_TRY();
    4646             : 
    4647         264 :     xtCxt->xmlerrcxt = xmlerrcxt;
    4648         264 :     xtCxt->ctxt = ctxt;
    4649             : 
    4650         264 :     state->opaque = xtCxt;
    4651             : #else
    4652             :     NO_XML_SUPPORT();
    4653             : #endif                          /* not USE_LIBXML */
    4654         264 : }
    4655             : 
    4656             : /*
    4657             :  * XmlTableSetDocument
    4658             :  *      Install the input document
    4659             :  */
    4660             : static void
    4661         264 : XmlTableSetDocument(TableFuncScanState *state, Datum value)
    4662             : {
    4663             : #ifdef USE_LIBXML
    4664             :     XmlTableBuilderData *xtCxt;
    4665         264 :     xmltype    *xmlval = DatumGetXmlP(value);
    4666             :     char       *str;
    4667             :     xmlChar    *xstr;
    4668             :     int         length;
    4669         264 :     volatile xmlDocPtr doc = NULL;
    4670         264 :     volatile xmlXPathContextPtr xpathcxt = NULL;
    4671             : 
    4672         264 :     xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableSetDocument");
    4673             : 
    4674             :     /*
    4675             :      * Use out function for casting to string (remove encoding property). See
    4676             :      * comment in xml_out.
    4677             :      */
    4678         264 :     str = xml_out_internal(xmlval, 0);
    4679             : 
    4680         264 :     length = strlen(str);
    4681         264 :     xstr = pg_xmlCharStrndup(str, length);
    4682             : 
    4683         264 :     PG_TRY();
    4684             :     {
    4685         264 :         doc = xmlCtxtReadMemory(xtCxt->ctxt, (char *) xstr, length, NULL, NULL, 0);
    4686         264 :         if (doc == NULL || xtCxt->xmlerrcxt->err_occurred)
    4687           0 :             xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_INVALID_XML_DOCUMENT,
    4688             :                         "could not parse XML document");
    4689         264 :         xpathcxt = xmlXPathNewContext(doc);
    4690         264 :         if (xpathcxt == NULL || xtCxt->xmlerrcxt->err_occurred)
    4691           0 :             xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_OUT_OF_MEMORY,
    4692             :                         "could not allocate XPath context");
    4693         264 :         xpathcxt->node = (xmlNodePtr) doc;
    4694             :     }
    4695           0 :     PG_CATCH();
    4696             :     {
    4697           0 :         if (xpathcxt != NULL)
    4698           0 :             xmlXPathFreeContext(xpathcxt);
    4699           0 :         if (doc != NULL)
    4700           0 :             xmlFreeDoc(doc);
    4701             : 
    4702           0 :         PG_RE_THROW();
    4703             :     }
    4704         264 :     PG_END_TRY();
    4705             : 
    4706         264 :     xtCxt->doc = doc;
    4707         264 :     xtCxt->xpathcxt = xpathcxt;
    4708             : #else
    4709             :     NO_XML_SUPPORT();
    4710             : #endif                          /* not USE_LIBXML */
    4711         264 : }
    4712             : 
    4713             : /*
    4714             :  * XmlTableSetNamespace
    4715             :  *      Add a namespace declaration
    4716             :  */
    4717             : static void
    4718          18 : XmlTableSetNamespace(TableFuncScanState *state, const char *name, const char *uri)
    4719             : {
    4720             : #ifdef USE_LIBXML
    4721             :     XmlTableBuilderData *xtCxt;
    4722             : 
    4723          18 :     if (name == NULL)
    4724           6 :         ereport(ERROR,
    4725             :                 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
    4726             :                  errmsg("DEFAULT namespace is not supported")));
    4727          12 :     xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableSetNamespace");
    4728             : 
    4729          12 :     if (xmlXPathRegisterNs(xtCxt->xpathcxt,
    4730          12 :                            pg_xmlCharStrndup(name, strlen(name)),
    4731          12 :                            pg_xmlCharStrndup(uri, strlen(uri))))
    4732           0 :         xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_DATA_EXCEPTION,
    4733             :                     "could not set XML namespace");
    4734             : #else
    4735             :     NO_XML_SUPPORT();
    4736             : #endif                          /* not USE_LIBXML */
    4737          12 : }
    4738             : 
    4739             : /*
    4740             :  * XmlTableSetRowFilter
    4741             :  *      Install the row-filter Xpath expression.
    4742             :  */
    4743             : static void
    4744         258 : XmlTableSetRowFilter(TableFuncScanState *state, const char *path)
    4745             : {
    4746             : #ifdef USE_LIBXML
    4747             :     XmlTableBuilderData *xtCxt;
    4748             :     xmlChar    *xstr;
    4749             : 
    4750         258 :     xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableSetRowFilter");
    4751             : 
    4752         258 :     if (*path == '\0')
    4753           0 :         ereport(ERROR,
    4754             :                 (errcode(ERRCODE_DATA_EXCEPTION),
    4755             :                  errmsg("row path filter must not be empty string")));
    4756             : 
    4757         258 :     xstr = pg_xmlCharStrndup(path, strlen(path));
    4758             : 
    4759         258 :     xtCxt->xpathcomp = xmlXPathCompile(xstr);
    4760         258 :     if (xtCxt->xpathcomp == NULL || xtCxt->xmlerrcxt->err_occurred)
    4761           0 :         xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_SYNTAX_ERROR,
    4762             :                     "invalid XPath expression");
    4763             : #else
    4764             :     NO_XML_SUPPORT();
    4765             : #endif                          /* not USE_LIBXML */
    4766         258 : }
    4767             : 
    4768             : /*
    4769             :  * XmlTableSetColumnFilter
    4770             :  *      Install the column-filter Xpath expression, for the given column.
    4771             :  */
    4772             : static void
    4773         774 : XmlTableSetColumnFilter(TableFuncScanState *state, const char *path, int colnum)
    4774             : {
    4775             : #ifdef USE_LIBXML
    4776             :     XmlTableBuilderData *xtCxt;
    4777             :     xmlChar    *xstr;
    4778             : 
    4779             :     Assert(PointerIsValid(path));
    4780             : 
    4781         774 :     xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableSetColumnFilter");
    4782             : 
    4783         774 :     if (*path == '\0')
    4784           0 :         ereport(ERROR,
    4785             :                 (errcode(ERRCODE_DATA_EXCEPTION),
    4786             :                  errmsg("column path filter must not be empty string")));
    4787             : 
    4788         774 :     xstr = pg_xmlCharStrndup(path, strlen(path));
    4789             : 
    4790         774 :     xtCxt->xpathscomp[colnum] = xmlXPathCompile(xstr);
    4791         774 :     if (xtCxt->xpathscomp[colnum] == NULL || xtCxt->xmlerrcxt->err_occurred)
    4792           0 :         xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_DATA_EXCEPTION,
    4793             :                     "invalid XPath expression");
    4794             : #else
    4795             :     NO_XML_SUPPORT();
    4796             : #endif                          /* not USE_LIBXML */
    4797         774 : }
    4798             : 
    4799             : /*
    4800             :  * XmlTableFetchRow
    4801             :  *      Prepare the next "current" tuple for upcoming GetValue calls.
    4802             :  *      Returns false if the row-filter expression returned no more rows.
    4803             :  */
    4804             : static bool
    4805       22270 : XmlTableFetchRow(TableFuncScanState *state)
    4806             : {
    4807             : #ifdef USE_LIBXML
    4808             :     XmlTableBuilderData *xtCxt;
    4809             : 
    4810       22270 :     xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableFetchRow");
    4811             : 
    4812             :     /* Propagate our own error context to libxml2 */
    4813       22270 :     xmlSetStructuredErrorFunc((void *) xtCxt->xmlerrcxt, xml_errorHandler);
    4814             : 
    4815       22270 :     if (xtCxt->xpathobj == NULL)
    4816             :     {
    4817         258 :         xtCxt->xpathobj = xmlXPathCompiledEval(xtCxt->xpathcomp, xtCxt->xpathcxt);
    4818         258 :         if (xtCxt->xpathobj == NULL || xtCxt->xmlerrcxt->err_occurred)
    4819           0 :             xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
    4820             :                         "could not create XPath object");
    4821             : 
    4822         258 :         xtCxt->row_count = 0;
    4823             :     }
    4824             : 
    4825       22270 :     if (xtCxt->xpathobj->type == XPATH_NODESET)
    4826             :     {
    4827       22270 :         if (xtCxt->xpathobj->nodesetval != NULL)
    4828             :         {
    4829       22270 :             if (xtCxt->row_count++ < xtCxt->xpathobj->nodesetval->nodeNr)
    4830       22024 :                 return true;
    4831             :         }
    4832             :     }
    4833             : 
    4834         246 :     return false;
    4835             : #else
    4836             :     NO_XML_SUPPORT();
    4837             :     return false;
    4838             : #endif                          /* not USE_LIBXML */
    4839             : }
    4840             : 
    4841             : /*
    4842             :  * XmlTableGetValue
    4843             :  *      Return the value for column number 'colnum' for the current row.  If
    4844             :  *      column -1 is requested, return representation of the whole row.
    4845             :  *
    4846             :  * This leaks memory, so be sure to reset often the context in which it's
    4847             :  * called.
    4848             :  */
    4849             : static Datum
    4850      131094 : XmlTableGetValue(TableFuncScanState *state, int colnum,
    4851             :                  Oid typid, int32 typmod, bool *isnull)
    4852             : {
    4853             : #ifdef USE_LIBXML
    4854             :     XmlTableBuilderData *xtCxt;
    4855      131094 :     Datum       result = (Datum) 0;
    4856             :     xmlNodePtr  cur;
    4857      131094 :     char       *cstr = NULL;
    4858      131094 :     volatile xmlXPathObjectPtr xpathobj = NULL;
    4859             : 
    4860      131094 :     xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableGetValue");
    4861             : 
    4862             :     Assert(xtCxt->xpathobj &&
    4863             :            xtCxt->xpathobj->type == XPATH_NODESET &&
    4864             :            xtCxt->xpathobj->nodesetval != NULL);
    4865             : 
    4866             :     /* Propagate our own error context to libxml2 */
    4867      131094 :     xmlSetStructuredErrorFunc((void *) xtCxt->xmlerrcxt, xml_errorHandler);
    4868             : 
    4869      131094 :     *isnull = false;
    4870             : 
    4871      131094 :     cur = xtCxt->xpathobj->nodesetval->nodeTab[xtCxt->row_count - 1];
    4872             : 
    4873             :     Assert(xtCxt->xpathscomp[colnum] != NULL);
    4874             : 
    4875      131094 :     PG_TRY();
    4876             :     {
    4877             :         /* Set current node as entry point for XPath evaluation */
    4878      131094 :         xtCxt->xpathcxt->node = cur;
    4879             : 
    4880             :         /* Evaluate column path */
    4881      131094 :         xpathobj = xmlXPathCompiledEval(xtCxt->xpathscomp[colnum], xtCxt->xpathcxt);
    4882      131094 :         if (xpathobj == NULL || xtCxt->xmlerrcxt->err_occurred)
    4883           0 :             xml_ereport(xtCxt->xmlerrcxt, ERROR, ERRCODE_INTERNAL_ERROR,
    4884             :                         "could not create XPath object");
    4885             : 
    4886             :         /*
    4887             :          * There are four possible cases, depending on the number of nodes
    4888             :          * returned by the XPath expression and the type of the target column:
    4889             :          * a) XPath returns no nodes.  b) The target type is XML (return all
    4890             :          * as XML).  For non-XML return types:  c) One node (return content).
    4891             :          * d) Multiple nodes (error).
    4892             :          */
    4893      131094 :         if (xpathobj->type == XPATH_NODESET)
    4894             :         {
    4895      131064 :             int         count = 0;
    4896             : 
    4897      131064 :             if (xpathobj->nodesetval != NULL)
    4898      130854 :                 count = xpathobj->nodesetval->nodeNr;
    4899             : 
    4900      131064 :             if (xpathobj->nodesetval == NULL || count == 0)
    4901             :             {
    4902       22118 :                 *isnull = true;
    4903             :             }
    4904             :             else
    4905             :             {
    4906      108946 :                 if (typid == XMLOID)
    4907             :                 {
    4908             :                     text       *textstr;
    4909             :                     StringInfoData str;
    4910             : 
    4911             :                     /* Concatenate serialized values */
    4912          72 :                     initStringInfo(&str);
    4913         174 :                     for (int i = 0; i < count; i++)
    4914             :                     {
    4915             :                         textstr =
    4916         102 :                             xml_xmlnodetoxmltype(xpathobj->nodesetval->nodeTab[i],
    4917             :                                                  xtCxt->xmlerrcxt);
    4918             : 
    4919         102 :                         appendStringInfoText(&str, textstr);
    4920             :                     }
    4921          72 :                     cstr = str.data;
    4922             :                 }
    4923             :                 else
    4924             :                 {
    4925             :                     xmlChar    *str;
    4926             : 
    4927      108874 :                     if (count > 1)
    4928           6 :                         ereport(ERROR,
    4929             :                                 (errcode(ERRCODE_CARDINALITY_VIOLATION),
    4930             :                                  errmsg("more than one value returned by column XPath expression")));
    4931             : 
    4932      108868 :                     str = xmlXPathCastNodeSetToString(xpathobj->nodesetval);
    4933      108868 :                     cstr = str ? xml_pstrdup_and_free(str) : "";
    4934             :                 }
    4935             :             }
    4936             :         }
    4937          30 :         else if (xpathobj->type == XPATH_STRING)
    4938             :         {
    4939             :             /* Content should be escaped when target will be XML */
    4940          18 :             if (typid == XMLOID)
    4941           6 :                 cstr = escape_xml((char *) xpathobj->stringval);
    4942             :             else
    4943          12 :                 cstr = (char *) xpathobj->stringval;
    4944             :         }
    4945          12 :         else if (xpathobj->type == XPATH_BOOLEAN)
    4946             :         {
    4947             :             char        typcategory;
    4948             :             bool        typispreferred;
    4949             :             xmlChar    *str;
    4950             : 
    4951             :             /* Allow implicit casting from boolean to numbers */
    4952           6 :             get_type_category_preferred(typid, &typcategory, &typispreferred);
    4953             : 
    4954           6 :             if (typcategory != TYPCATEGORY_NUMERIC)
    4955           6 :                 str = xmlXPathCastBooleanToString(xpathobj->boolval);
    4956             :             else
    4957           0 :                 str = xmlXPathCastNumberToString(xmlXPathCastBooleanToNumber(xpathobj->boolval));
    4958             : 
    4959           6 :             cstr = xml_pstrdup_and_free(str);
    4960             :         }
    4961           6 :         else if (xpathobj->type == XPATH_NUMBER)
    4962             :         {
    4963             :             xmlChar    *str;
    4964             : 
    4965           6 :             str = xmlXPathCastNumberToString(xpathobj->floatval);
    4966           6 :             cstr = xml_pstrdup_and_free(str);
    4967             :         }
    4968             :         else
    4969           0 :             elog(ERROR, "unexpected XPath object type %u", xpathobj->type);
    4970             : 
    4971             :         /*
    4972             :          * By here, either cstr contains the result value, or the isnull flag
    4973             :          * has been set.
    4974             :          */
    4975             :         Assert(cstr || *isnull);
    4976             : 
    4977      131088 :         if (!*isnull)
    4978      108970 :             result = InputFunctionCall(&state->in_functions[colnum],
    4979             :                                        cstr,
    4980      108970 :                                        state->typioparams[colnum],
    4981             :                                        typmod);
    4982             :     }
    4983           6 :     PG_FINALLY();
    4984             :     {
    4985      131094 :         if (xpathobj != NULL)
    4986      131094 :             xmlXPathFreeObject(xpathobj);
    4987             :     }
    4988      131094 :     PG_END_TRY();
    4989             : 
    4990      131088 :     return result;
    4991             : #else
    4992             :     NO_XML_SUPPORT();
    4993             :     return 0;
    4994             : #endif                          /* not USE_LIBXML */
    4995             : }
    4996             : 
    4997             : /*
    4998             :  * XmlTableDestroyOpaque
    4999             :  *      Release all libxml2 resources
    5000             :  */
    5001             : static void
    5002         264 : XmlTableDestroyOpaque(TableFuncScanState *state)
    5003             : {
    5004             : #ifdef USE_LIBXML
    5005             :     XmlTableBuilderData *xtCxt;
    5006             : 
    5007         264 :     xtCxt = GetXmlTableBuilderPrivateData(state, "XmlTableDestroyOpaque");
    5008             : 
    5009             :     /* Propagate our own error context to libxml2 */
    5010         264 :     xmlSetStructuredErrorFunc((void *) xtCxt->xmlerrcxt, xml_errorHandler);
    5011             : 
    5012         264 :     if (xtCxt->xpathscomp != NULL)
    5013             :     {
    5014             :         int         i;
    5015             : 
    5016        1116 :         for (i = 0; i < xtCxt->natts; i++)
    5017         852 :             if (xtCxt->xpathscomp[i] != NULL)
    5018         774 :                 xmlXPathFreeCompExpr(xtCxt->xpathscomp[i]);
    5019             :     }
    5020             : 
    5021         264 :     if (xtCxt->xpathobj != NULL)
    5022         258 :         xmlXPathFreeObject(xtCxt->xpathobj);
    5023         264 :     if (xtCxt->xpathcomp != NULL)
    5024         258 :         xmlXPathFreeCompExpr(xtCxt->xpathcomp);
    5025         264 :     if (xtCxt->xpathcxt != NULL)
    5026         264 :         xmlXPathFreeContext(xtCxt->xpathcxt);
    5027         264 :     if (xtCxt->doc != NULL)
    5028         264 :         xmlFreeDoc(xtCxt->doc);
    5029         264 :     if (xtCxt->ctxt != NULL)
    5030         264 :         xmlFreeParserCtxt(xtCxt->ctxt);
    5031             : 
    5032         264 :     pg_xml_done(xtCxt->xmlerrcxt, true);
    5033             : 
    5034             :     /* not valid anymore */
    5035         264 :     xtCxt->magic = 0;
    5036         264 :     state->opaque = NULL;
    5037             : 
    5038             : #else
    5039             :     NO_XML_SUPPORT();
    5040             : #endif                          /* not USE_LIBXML */
    5041         264 : }

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