LCOV - code coverage report
Current view: top level - src/interfaces/libpq - fe-protocol3.c (source / functions) Hit Total Coverage
Test: PostgreSQL 18devel Lines: 610 953 64.0 %
Date: 2025-04-24 12:15:10 Functions: 18 22 81.8 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*-------------------------------------------------------------------------
       2             :  *
       3             :  * fe-protocol3.c
       4             :  *    functions that are specific to frontend/backend protocol version 3
       5             :  *
       6             :  * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
       7             :  * Portions Copyright (c) 1994, Regents of the University of California
       8             :  *
       9             :  *
      10             :  * IDENTIFICATION
      11             :  *    src/interfaces/libpq/fe-protocol3.c
      12             :  *
      13             :  *-------------------------------------------------------------------------
      14             :  */
      15             : #include "postgres_fe.h"
      16             : 
      17             : #include <ctype.h>
      18             : #include <fcntl.h>
      19             : 
      20             : #ifdef WIN32
      21             : #include "win32.h"
      22             : #else
      23             : #include <unistd.h>
      24             : #include <netinet/tcp.h>
      25             : #endif
      26             : 
      27             : #include "libpq-fe.h"
      28             : #include "libpq-int.h"
      29             : #include "mb/pg_wchar.h"
      30             : #include "port/pg_bswap.h"
      31             : 
      32             : /*
      33             :  * This macro lists the backend message types that could be "long" (more
      34             :  * than a couple of kilobytes).
      35             :  */
      36             : #define VALID_LONG_MESSAGE_TYPE(id) \
      37             :     ((id) == PqMsg_CopyData || \
      38             :      (id) == PqMsg_DataRow || \
      39             :      (id) == PqMsg_ErrorResponse || \
      40             :      (id) == PqMsg_FunctionCallResponse || \
      41             :      (id) == PqMsg_NoticeResponse || \
      42             :      (id) == PqMsg_NotificationResponse || \
      43             :      (id) == PqMsg_RowDescription)
      44             : 
      45             : 
      46             : static void handleSyncLoss(PGconn *conn, char id, int msgLength);
      47             : static int  getRowDescriptions(PGconn *conn, int msgLength);
      48             : static int  getParamDescriptions(PGconn *conn, int msgLength);
      49             : static int  getAnotherTuple(PGconn *conn, int msgLength);
      50             : static int  getParameterStatus(PGconn *conn);
      51             : static int  getBackendKeyData(PGconn *conn, int msgLength);
      52             : static int  getNotify(PGconn *conn);
      53             : static int  getCopyStart(PGconn *conn, ExecStatusType copytype);
      54             : static int  getReadyForQuery(PGconn *conn);
      55             : static void reportErrorPosition(PQExpBuffer msg, const char *query,
      56             :                                 int loc, int encoding);
      57             : static int  build_startup_packet(const PGconn *conn, char *packet,
      58             :                                  const PQEnvironmentOption *options);
      59             : 
      60             : 
      61             : /*
      62             :  * parseInput: if appropriate, parse input data from backend
      63             :  * until input is exhausted or a stopping state is reached.
      64             :  * Note that this function will NOT attempt to read more data from the backend.
      65             :  */
      66             : void
      67    14450188 : pqParseInput3(PGconn *conn)
      68             : {
      69             :     char        id;
      70             :     int         msgLength;
      71             :     int         avail;
      72             : 
      73             :     /*
      74             :      * Loop to parse successive complete messages available in the buffer.
      75             :      */
      76             :     for (;;)
      77             :     {
      78             :         /*
      79             :          * Try to read a message.  First get the type code and length. Return
      80             :          * if not enough data.
      81             :          */
      82    14450188 :         conn->inCursor = conn->inStart;
      83    14450188 :         if (pqGetc(&id, conn))
      84     2728178 :             return;
      85    11722010 :         if (pqGetInt(&msgLength, 4, conn))
      86        3512 :             return;
      87             : 
      88             :         /*
      89             :          * Try to validate message type/length here.  A length less than 4 is
      90             :          * definitely broken.  Large lengths should only be believed for a few
      91             :          * message types.
      92             :          */
      93    11718498 :         if (msgLength < 4)
      94             :         {
      95           0 :             handleSyncLoss(conn, id, msgLength);
      96           0 :             return;
      97             :         }
      98    11718498 :         if (msgLength > 30000 && !VALID_LONG_MESSAGE_TYPE(id))
      99             :         {
     100           0 :             handleSyncLoss(conn, id, msgLength);
     101           0 :             return;
     102             :         }
     103             : 
     104             :         /*
     105             :          * Can't process if message body isn't all here yet.
     106             :          */
     107    11718498 :         msgLength -= 4;
     108    11718498 :         avail = conn->inEnd - conn->inCursor;
     109    11718498 :         if (avail < msgLength)
     110             :         {
     111             :             /*
     112             :              * Before returning, enlarge the input buffer if needed to hold
     113             :              * the whole message.  This is better than leaving it to
     114             :              * pqReadData because we can avoid multiple cycles of realloc()
     115             :              * when the message is large; also, we can implement a reasonable
     116             :              * recovery strategy if we are unable to make the buffer big
     117             :              * enough.
     118             :              */
     119       68358 :             if (pqCheckInBufferSpace(conn->inCursor + (size_t) msgLength,
     120             :                                      conn))
     121             :             {
     122             :                 /*
     123             :                  * XXX add some better recovery code... plan is to skip over
     124             :                  * the message using its length, then report an error. For the
     125             :                  * moment, just treat this like loss of sync (which indeed it
     126             :                  * might be!)
     127             :                  */
     128           0 :                 handleSyncLoss(conn, id, msgLength);
     129             :             }
     130       68358 :             return;
     131             :         }
     132             : 
     133             :         /*
     134             :          * NOTIFY and NOTICE messages can happen in any state; always process
     135             :          * them right away.
     136             :          *
     137             :          * Most other messages should only be processed while in BUSY state.
     138             :          * (In particular, in READY state we hold off further parsing until
     139             :          * the application collects the current PGresult.)
     140             :          *
     141             :          * However, if the state is IDLE then we got trouble; we need to deal
     142             :          * with the unexpected message somehow.
     143             :          *
     144             :          * ParameterStatus ('S') messages are a special case: in IDLE state we
     145             :          * must process 'em (this case could happen if a new value was adopted
     146             :          * from config file due to SIGHUP), but otherwise we hold off until
     147             :          * BUSY state.
     148             :          */
     149    11650140 :         if (id == PqMsg_NotificationResponse)
     150             :         {
     151          62 :             if (getNotify(conn))
     152           0 :                 return;
     153             :         }
     154    11650078 :         else if (id == PqMsg_NoticeResponse)
     155             :         {
     156      156272 :             if (pqGetErrorNotice3(conn, false))
     157           0 :                 return;
     158             :         }
     159    11493806 :         else if (conn->asyncStatus != PGASYNC_BUSY)
     160             :         {
     161             :             /* If not IDLE state, just wait ... */
     162      784298 :             if (conn->asyncStatus != PGASYNC_IDLE)
     163      784286 :                 return;
     164             : 
     165             :             /*
     166             :              * Unexpected message in IDLE state; need to recover somehow.
     167             :              * ERROR messages are handled using the notice processor;
     168             :              * ParameterStatus is handled normally; anything else is just
     169             :              * dropped on the floor after displaying a suitable warning
     170             :              * notice.  (An ERROR is very possibly the backend telling us why
     171             :              * it is about to close the connection, so we don't want to just
     172             :              * discard it...)
     173             :              */
     174          12 :             if (id == PqMsg_ErrorResponse)
     175             :             {
     176           0 :                 if (pqGetErrorNotice3(conn, false /* treat as notice */ ))
     177           0 :                     return;
     178             :             }
     179          12 :             else if (id == PqMsg_ParameterStatus)
     180             :             {
     181           0 :                 if (getParameterStatus(conn))
     182           0 :                     return;
     183             :             }
     184             :             else
     185             :             {
     186             :                 /* Any other case is unexpected and we summarily skip it */
     187          12 :                 pqInternalNotice(&conn->noticeHooks,
     188             :                                  "message type 0x%02x arrived from server while idle",
     189             :                                  id);
     190             :                 /* Discard the unexpected message */
     191          12 :                 conn->inCursor += msgLength;
     192             :             }
     193             :         }
     194             :         else
     195             :         {
     196             :             /*
     197             :              * In BUSY state, we can process everything.
     198             :              */
     199    10709508 :             switch (id)
     200             :             {
     201      657152 :                 case PqMsg_CommandComplete:
     202      657152 :                     if (pqGets(&conn->workBuffer, conn))
     203           0 :                         return;
     204      657152 :                     if (!pgHavePendingResult(conn))
     205             :                     {
     206      332776 :                         conn->result = PQmakeEmptyPGresult(conn,
     207             :                                                            PGRES_COMMAND_OK);
     208      332776 :                         if (!conn->result)
     209             :                         {
     210           0 :                             libpq_append_conn_error(conn, "out of memory");
     211           0 :                             pqSaveErrorResult(conn);
     212             :                         }
     213             :                     }
     214      657152 :                     if (conn->result)
     215      657152 :                         strlcpy(conn->result->cmdStatus, conn->workBuffer.data,
     216             :                                 CMDSTATUS_LEN);
     217      657152 :                     conn->asyncStatus = PGASYNC_READY;
     218      657152 :                     break;
     219       43086 :                 case PqMsg_ErrorResponse:
     220       43086 :                     if (pqGetErrorNotice3(conn, true))
     221           0 :                         return;
     222       43086 :                     conn->asyncStatus = PGASYNC_READY;
     223       43086 :                     break;
     224      688300 :                 case PqMsg_ReadyForQuery:
     225      688300 :                     if (getReadyForQuery(conn))
     226           0 :                         return;
     227      688300 :                     if (conn->pipelineStatus != PQ_PIPELINE_OFF)
     228             :                     {
     229         622 :                         conn->result = PQmakeEmptyPGresult(conn,
     230             :                                                            PGRES_PIPELINE_SYNC);
     231         622 :                         if (!conn->result)
     232             :                         {
     233           0 :                             libpq_append_conn_error(conn, "out of memory");
     234           0 :                             pqSaveErrorResult(conn);
     235             :                         }
     236             :                         else
     237             :                         {
     238         622 :                             conn->pipelineStatus = PQ_PIPELINE_ON;
     239         622 :                             conn->asyncStatus = PGASYNC_READY;
     240             :                         }
     241             :                     }
     242             :                     else
     243             :                     {
     244             :                         /* Advance the command queue and set us idle */
     245      687678 :                         pqCommandQueueAdvance(conn, true, false);
     246      687678 :                         conn->asyncStatus = PGASYNC_IDLE;
     247             :                     }
     248      688300 :                     break;
     249        1380 :                 case PqMsg_EmptyQueryResponse:
     250        1380 :                     if (!pgHavePendingResult(conn))
     251             :                     {
     252        1380 :                         conn->result = PQmakeEmptyPGresult(conn,
     253             :                                                            PGRES_EMPTY_QUERY);
     254        1380 :                         if (!conn->result)
     255             :                         {
     256           0 :                             libpq_append_conn_error(conn, "out of memory");
     257           0 :                             pqSaveErrorResult(conn);
     258             :                         }
     259             :                     }
     260        1380 :                     conn->asyncStatus = PGASYNC_READY;
     261        1380 :                     break;
     262       11078 :                 case PqMsg_ParseComplete:
     263             :                     /* If we're doing PQprepare, we're done; else ignore */
     264       11078 :                     if (conn->cmd_queue_head &&
     265       11078 :                         conn->cmd_queue_head->queryclass == PGQUERY_PREPARE)
     266             :                     {
     267        4418 :                         if (!pgHavePendingResult(conn))
     268             :                         {
     269        4418 :                             conn->result = PQmakeEmptyPGresult(conn,
     270             :                                                                PGRES_COMMAND_OK);
     271        4418 :                             if (!conn->result)
     272             :                             {
     273           0 :                                 libpq_append_conn_error(conn, "out of memory");
     274           0 :                                 pqSaveErrorResult(conn);
     275             :                             }
     276             :                         }
     277        4418 :                         conn->asyncStatus = PGASYNC_READY;
     278             :                     }
     279       11078 :                     break;
     280       21660 :                 case PqMsg_BindComplete:
     281             :                     /* Nothing to do for this message type */
     282       21660 :                     break;
     283          32 :                 case PqMsg_CloseComplete:
     284             :                     /* If we're doing PQsendClose, we're done; else ignore */
     285          32 :                     if (conn->cmd_queue_head &&
     286          32 :                         conn->cmd_queue_head->queryclass == PGQUERY_CLOSE)
     287             :                     {
     288          32 :                         if (!pgHavePendingResult(conn))
     289             :                         {
     290          32 :                             conn->result = PQmakeEmptyPGresult(conn,
     291             :                                                                PGRES_COMMAND_OK);
     292          32 :                             if (!conn->result)
     293             :                             {
     294           0 :                                 libpq_append_conn_error(conn, "out of memory");
     295           0 :                                 pqSaveErrorResult(conn);
     296             :                             }
     297             :                         }
     298          32 :                         conn->asyncStatus = PGASYNC_READY;
     299             :                     }
     300          32 :                     break;
     301      399448 :                 case PqMsg_ParameterStatus:
     302      399448 :                     if (getParameterStatus(conn))
     303           0 :                         return;
     304      399448 :                     break;
     305       25716 :                 case PqMsg_BackendKeyData:
     306             : 
     307             :                     /*
     308             :                      * This is expected only during backend startup, but it's
     309             :                      * just as easy to handle it as part of the main loop.
     310             :                      * Save the data and continue processing.
     311             :                      */
     312       25716 :                     if (getBackendKeyData(conn, msgLength))
     313           0 :                         return;
     314       25716 :                     break;
     315      331692 :                 case PqMsg_RowDescription:
     316      331692 :                     if (conn->error_result ||
     317      331692 :                         (conn->result != NULL &&
     318         128 :                          conn->result->resultStatus == PGRES_FATAL_ERROR))
     319             :                     {
     320             :                         /*
     321             :                          * We've already choked for some reason.  Just discard
     322             :                          * the data till we get to the end of the query.
     323             :                          */
     324           0 :                         conn->inCursor += msgLength;
     325             :                     }
     326      331692 :                     else if (conn->result == NULL ||
     327         128 :                              (conn->cmd_queue_head &&
     328         128 :                               conn->cmd_queue_head->queryclass == PGQUERY_DESCRIBE))
     329             :                     {
     330             :                         /* First 'T' in a query sequence */
     331      331692 :                         if (getRowDescriptions(conn, msgLength))
     332           0 :                             return;
     333             :                     }
     334             :                     else
     335             :                     {
     336             :                         /*
     337             :                          * A new 'T' message is treated as the start of
     338             :                          * another PGresult.  (It is not clear that this is
     339             :                          * really possible with the current backend.) We stop
     340             :                          * parsing until the application accepts the current
     341             :                          * result.
     342             :                          */
     343           0 :                         conn->asyncStatus = PGASYNC_READY;
     344           0 :                         return;
     345             :                     }
     346      331692 :                     break;
     347       12656 :                 case PqMsg_NoData:
     348             : 
     349             :                     /*
     350             :                      * NoData indicates that we will not be seeing a
     351             :                      * RowDescription message because the statement or portal
     352             :                      * inquired about doesn't return rows.
     353             :                      *
     354             :                      * If we're doing a Describe, we have to pass something
     355             :                      * back to the client, so set up a COMMAND_OK result,
     356             :                      * instead of PGRES_TUPLES_OK.  Otherwise we can just
     357             :                      * ignore this message.
     358             :                      */
     359       12656 :                     if (conn->cmd_queue_head &&
     360       12656 :                         conn->cmd_queue_head->queryclass == PGQUERY_DESCRIBE)
     361             :                     {
     362          12 :                         if (!pgHavePendingResult(conn))
     363             :                         {
     364           0 :                             conn->result = PQmakeEmptyPGresult(conn,
     365             :                                                                PGRES_COMMAND_OK);
     366           0 :                             if (!conn->result)
     367             :                             {
     368           0 :                                 libpq_append_conn_error(conn, "out of memory");
     369           0 :                                 pqSaveErrorResult(conn);
     370             :                             }
     371             :                         }
     372          12 :                         conn->asyncStatus = PGASYNC_READY;
     373             :                     }
     374       12656 :                     break;
     375         140 :                 case PqMsg_ParameterDescription:
     376         140 :                     if (getParamDescriptions(conn, msgLength))
     377           0 :                         return;
     378         140 :                     break;
     379     8486922 :                 case PqMsg_DataRow:
     380     8486922 :                     if (conn->result != NULL &&
     381     8486922 :                         (conn->result->resultStatus == PGRES_TUPLES_OK ||
     382         186 :                          conn->result->resultStatus == PGRES_TUPLES_CHUNK))
     383             :                     {
     384             :                         /* Read another tuple of a normal query response */
     385     8486922 :                         if (getAnotherTuple(conn, msgLength))
     386           0 :                             return;
     387             :                     }
     388           0 :                     else if (conn->error_result ||
     389           0 :                              (conn->result != NULL &&
     390           0 :                               conn->result->resultStatus == PGRES_FATAL_ERROR))
     391             :                     {
     392             :                         /*
     393             :                          * We've already choked for some reason.  Just discard
     394             :                          * tuples till we get to the end of the query.
     395             :                          */
     396           0 :                         conn->inCursor += msgLength;
     397             :                     }
     398             :                     else
     399             :                     {
     400             :                         /* Set up to report error at end of query */
     401           0 :                         libpq_append_conn_error(conn, "server sent data (\"D\" message) without prior row description (\"T\" message)");
     402           0 :                         pqSaveErrorResult(conn);
     403             :                         /* Discard the unexpected message */
     404           0 :                         conn->inCursor += msgLength;
     405             :                     }
     406     8486922 :                     break;
     407        2276 :                 case PqMsg_CopyInResponse:
     408        2276 :                     if (getCopyStart(conn, PGRES_COPY_IN))
     409           0 :                         return;
     410        2276 :                     conn->asyncStatus = PGASYNC_COPY_IN;
     411        2276 :                     break;
     412       12988 :                 case PqMsg_CopyOutResponse:
     413       12988 :                     if (getCopyStart(conn, PGRES_COPY_OUT))
     414           0 :                         return;
     415       12988 :                     conn->asyncStatus = PGASYNC_COPY_OUT;
     416       12988 :                     conn->copy_already_done = 0;
     417       12988 :                     break;
     418        1320 :                 case PqMsg_CopyBothResponse:
     419        1320 :                     if (getCopyStart(conn, PGRES_COPY_BOTH))
     420           0 :                         return;
     421        1320 :                     conn->asyncStatus = PGASYNC_COPY_BOTH;
     422        1320 :                     conn->copy_already_done = 0;
     423        1320 :                     break;
     424          10 :                 case PqMsg_CopyData:
     425             : 
     426             :                     /*
     427             :                      * If we see Copy Data, just silently drop it.  This would
     428             :                      * only occur if application exits COPY OUT mode too
     429             :                      * early.
     430             :                      */
     431          10 :                     conn->inCursor += msgLength;
     432          10 :                     break;
     433       13652 :                 case PqMsg_CopyDone:
     434             : 
     435             :                     /*
     436             :                      * If we see Copy Done, just silently drop it.  This is
     437             :                      * the normal case during PQendcopy.  We will keep
     438             :                      * swallowing data, expecting to see command-complete for
     439             :                      * the COPY command.
     440             :                      */
     441       13652 :                     break;
     442           0 :                 default:
     443           0 :                     libpq_append_conn_error(conn, "unexpected response from server; first received character was \"%c\"", id);
     444             :                     /* build an error result holding the error message */
     445           0 :                     pqSaveErrorResult(conn);
     446             :                     /* not sure if we will see more, so go to ready state */
     447           0 :                     conn->asyncStatus = PGASYNC_READY;
     448             :                     /* Discard the unexpected message */
     449           0 :                     conn->inCursor += msgLength;
     450           0 :                     break;
     451             :             }                   /* switch on protocol character */
     452             :         }
     453             :         /* Successfully consumed this message */
     454    10865854 :         if (conn->inCursor == conn->inStart + 5 + msgLength)
     455             :         {
     456             :             /* Normal case: parsing agrees with specified length */
     457    10865854 :             pqParseDone(conn, conn->inCursor);
     458             :         }
     459             :         else
     460             :         {
     461             :             /* Trouble --- report it */
     462           0 :             libpq_append_conn_error(conn, "message contents do not agree with length in message type \"%c\"", id);
     463             :             /* build an error result holding the error message */
     464           0 :             pqSaveErrorResult(conn);
     465           0 :             conn->asyncStatus = PGASYNC_READY;
     466             :             /* trust the specified message length as what to skip */
     467           0 :             conn->inStart += 5 + msgLength;
     468             :         }
     469             :     }
     470             : }
     471             : 
     472             : /*
     473             :  * handleSyncLoss: clean up after loss of message-boundary sync
     474             :  *
     475             :  * There isn't really a lot we can do here except abandon the connection.
     476             :  */
     477             : static void
     478           0 : handleSyncLoss(PGconn *conn, char id, int msgLength)
     479             : {
     480           0 :     libpq_append_conn_error(conn, "lost synchronization with server: got message type \"%c\", length %d",
     481             :                             id, msgLength);
     482             :     /* build an error result holding the error message */
     483           0 :     pqSaveErrorResult(conn);
     484           0 :     conn->asyncStatus = PGASYNC_READY;   /* drop out of PQgetResult wait loop */
     485             :     /* flush input data since we're giving up on processing it */
     486           0 :     pqDropConnection(conn, true);
     487           0 :     conn->status = CONNECTION_BAD;   /* No more connection to backend */
     488           0 : }
     489             : 
     490             : /*
     491             :  * parseInput subroutine to read a 'T' (row descriptions) message.
     492             :  * We'll build a new PGresult structure (unless called for a Describe
     493             :  * command for a prepared statement) containing the attribute data.
     494             :  * Returns: 0 if processed message successfully, EOF to suspend parsing
     495             :  * (the latter case is not actually used currently).
     496             :  */
     497             : static int
     498      331692 : getRowDescriptions(PGconn *conn, int msgLength)
     499             : {
     500             :     PGresult   *result;
     501             :     int         nfields;
     502             :     const char *errmsg;
     503             :     int         i;
     504             : 
     505             :     /*
     506             :      * When doing Describe for a prepared statement, there'll already be a
     507             :      * PGresult created by getParamDescriptions, and we should fill data into
     508             :      * that.  Otherwise, create a new, empty PGresult.
     509             :      */
     510      331692 :     if (!conn->cmd_queue_head ||
     511      331692 :         (conn->cmd_queue_head &&
     512      331692 :          conn->cmd_queue_head->queryclass == PGQUERY_DESCRIBE))
     513             :     {
     514         130 :         if (conn->result)
     515         128 :             result = conn->result;
     516             :         else
     517           2 :             result = PQmakeEmptyPGresult(conn, PGRES_COMMAND_OK);
     518             :     }
     519             :     else
     520      331562 :         result = PQmakeEmptyPGresult(conn, PGRES_TUPLES_OK);
     521      331692 :     if (!result)
     522             :     {
     523           0 :         errmsg = NULL;          /* means "out of memory", see below */
     524           0 :         goto advance_and_error;
     525             :     }
     526             : 
     527             :     /* parseInput already read the 'T' label and message length. */
     528             :     /* the next two bytes are the number of fields */
     529      331692 :     if (pqGetInt(&(result->numAttributes), 2, conn))
     530             :     {
     531             :         /* We should not run out of data here, so complain */
     532           0 :         errmsg = libpq_gettext("insufficient data in \"T\" message");
     533           0 :         goto advance_and_error;
     534             :     }
     535      331692 :     nfields = result->numAttributes;
     536             : 
     537             :     /* allocate space for the attribute descriptors */
     538      331692 :     if (nfields > 0)
     539             :     {
     540      331470 :         result->attDescs = (PGresAttDesc *)
     541      331470 :             pqResultAlloc(result, nfields * sizeof(PGresAttDesc), true);
     542      331470 :         if (!result->attDescs)
     543             :         {
     544           0 :             errmsg = NULL;      /* means "out of memory", see below */
     545           0 :             goto advance_and_error;
     546             :         }
     547     4807774 :         MemSet(result->attDescs, 0, nfields * sizeof(PGresAttDesc));
     548             :     }
     549             : 
     550             :     /* result->binary is true only if ALL columns are binary */
     551      331692 :     result->binary = (nfields > 0) ? 1 : 0;
     552             : 
     553             :     /* get type info */
     554     1471348 :     for (i = 0; i < nfields; i++)
     555             :     {
     556             :         int         tableid;
     557             :         int         columnid;
     558             :         int         typid;
     559             :         int         typlen;
     560             :         int         atttypmod;
     561             :         int         format;
     562             : 
     563     2279312 :         if (pqGets(&conn->workBuffer, conn) ||
     564     2279312 :             pqGetInt(&tableid, 4, conn) ||
     565     2279312 :             pqGetInt(&columnid, 2, conn) ||
     566     2279312 :             pqGetInt(&typid, 4, conn) ||
     567     2279312 :             pqGetInt(&typlen, 2, conn) ||
     568     2279312 :             pqGetInt(&atttypmod, 4, conn) ||
     569     1139656 :             pqGetInt(&format, 2, conn))
     570             :         {
     571             :             /* We should not run out of data here, so complain */
     572           0 :             errmsg = libpq_gettext("insufficient data in \"T\" message");
     573           0 :             goto advance_and_error;
     574             :         }
     575             : 
     576             :         /*
     577             :          * Since pqGetInt treats 2-byte integers as unsigned, we need to
     578             :          * coerce these results to signed form.
     579             :          */
     580     1139656 :         columnid = (int) ((int16) columnid);
     581     1139656 :         typlen = (int) ((int16) typlen);
     582     1139656 :         format = (int) ((int16) format);
     583             : 
     584     2279312 :         result->attDescs[i].name = pqResultStrdup(result,
     585     1139656 :                                                   conn->workBuffer.data);
     586     1139656 :         if (!result->attDescs[i].name)
     587             :         {
     588           0 :             errmsg = NULL;      /* means "out of memory", see below */
     589           0 :             goto advance_and_error;
     590             :         }
     591     1139656 :         result->attDescs[i].tableid = tableid;
     592     1139656 :         result->attDescs[i].columnid = columnid;
     593     1139656 :         result->attDescs[i].format = format;
     594     1139656 :         result->attDescs[i].typid = typid;
     595     1139656 :         result->attDescs[i].typlen = typlen;
     596     1139656 :         result->attDescs[i].atttypmod = atttypmod;
     597             : 
     598     1139656 :         if (format != 1)
     599     1139570 :             result->binary = 0;
     600             :     }
     601             : 
     602             :     /* Success! */
     603      331692 :     conn->result = result;
     604             : 
     605             :     /*
     606             :      * If we're doing a Describe, we're done, and ready to pass the result
     607             :      * back to the client.
     608             :      */
     609      331692 :     if ((!conn->cmd_queue_head) ||
     610      331692 :         (conn->cmd_queue_head &&
     611      331692 :          conn->cmd_queue_head->queryclass == PGQUERY_DESCRIBE))
     612             :     {
     613         130 :         conn->asyncStatus = PGASYNC_READY;
     614         130 :         return 0;
     615             :     }
     616             : 
     617             :     /*
     618             :      * We could perform additional setup for the new result set here, but for
     619             :      * now there's nothing else to do.
     620             :      */
     621             : 
     622             :     /* And we're done. */
     623      331562 :     return 0;
     624             : 
     625           0 : advance_and_error:
     626             :     /* Discard unsaved result, if any */
     627           0 :     if (result && result != conn->result)
     628           0 :         PQclear(result);
     629             : 
     630             :     /*
     631             :      * Replace partially constructed result with an error result. First
     632             :      * discard the old result to try to win back some memory.
     633             :      */
     634           0 :     pqClearAsyncResult(conn);
     635             : 
     636             :     /*
     637             :      * If preceding code didn't provide an error message, assume "out of
     638             :      * memory" was meant.  The advantage of having this special case is that
     639             :      * freeing the old result first greatly improves the odds that gettext()
     640             :      * will succeed in providing a translation.
     641             :      */
     642           0 :     if (!errmsg)
     643           0 :         errmsg = libpq_gettext("out of memory for query result");
     644             : 
     645           0 :     appendPQExpBuffer(&conn->errorMessage, "%s\n", errmsg);
     646           0 :     pqSaveErrorResult(conn);
     647             : 
     648             :     /*
     649             :      * Show the message as fully consumed, else pqParseInput3 will overwrite
     650             :      * our error with a complaint about that.
     651             :      */
     652           0 :     conn->inCursor = conn->inStart + 5 + msgLength;
     653             : 
     654             :     /*
     655             :      * Return zero to allow input parsing to continue.  Subsequent "D"
     656             :      * messages will be ignored until we get to end of data, since an error
     657             :      * result is already set up.
     658             :      */
     659           0 :     return 0;
     660             : }
     661             : 
     662             : /*
     663             :  * parseInput subroutine to read a 't' (ParameterDescription) message.
     664             :  * We'll build a new PGresult structure containing the parameter data.
     665             :  * Returns: 0 if processed message successfully, EOF to suspend parsing
     666             :  * (the latter case is not actually used currently).
     667             :  */
     668             : static int
     669         140 : getParamDescriptions(PGconn *conn, int msgLength)
     670             : {
     671             :     PGresult   *result;
     672         140 :     const char *errmsg = NULL;  /* means "out of memory", see below */
     673             :     int         nparams;
     674             :     int         i;
     675             : 
     676         140 :     result = PQmakeEmptyPGresult(conn, PGRES_COMMAND_OK);
     677         140 :     if (!result)
     678           0 :         goto advance_and_error;
     679             : 
     680             :     /* parseInput already read the 't' label and message length. */
     681             :     /* the next two bytes are the number of parameters */
     682         140 :     if (pqGetInt(&(result->numParameters), 2, conn))
     683           0 :         goto not_enough_data;
     684         140 :     nparams = result->numParameters;
     685             : 
     686             :     /* allocate space for the parameter descriptors */
     687         140 :     if (nparams > 0)
     688             :     {
     689           8 :         result->paramDescs = (PGresParamDesc *)
     690           8 :             pqResultAlloc(result, nparams * sizeof(PGresParamDesc), true);
     691           8 :         if (!result->paramDescs)
     692           0 :             goto advance_and_error;
     693          14 :         MemSet(result->paramDescs, 0, nparams * sizeof(PGresParamDesc));
     694             :     }
     695             : 
     696             :     /* get parameter info */
     697         154 :     for (i = 0; i < nparams; i++)
     698             :     {
     699             :         int         typid;
     700             : 
     701          14 :         if (pqGetInt(&typid, 4, conn))
     702           0 :             goto not_enough_data;
     703          14 :         result->paramDescs[i].typid = typid;
     704             :     }
     705             : 
     706             :     /* Success! */
     707         140 :     conn->result = result;
     708             : 
     709         140 :     return 0;
     710             : 
     711           0 : not_enough_data:
     712           0 :     errmsg = libpq_gettext("insufficient data in \"t\" message");
     713             : 
     714           0 : advance_and_error:
     715             :     /* Discard unsaved result, if any */
     716           0 :     if (result && result != conn->result)
     717           0 :         PQclear(result);
     718             : 
     719             :     /*
     720             :      * Replace partially constructed result with an error result. First
     721             :      * discard the old result to try to win back some memory.
     722             :      */
     723           0 :     pqClearAsyncResult(conn);
     724             : 
     725             :     /*
     726             :      * If preceding code didn't provide an error message, assume "out of
     727             :      * memory" was meant.  The advantage of having this special case is that
     728             :      * freeing the old result first greatly improves the odds that gettext()
     729             :      * will succeed in providing a translation.
     730             :      */
     731           0 :     if (!errmsg)
     732           0 :         errmsg = libpq_gettext("out of memory");
     733           0 :     appendPQExpBuffer(&conn->errorMessage, "%s\n", errmsg);
     734           0 :     pqSaveErrorResult(conn);
     735             : 
     736             :     /*
     737             :      * Show the message as fully consumed, else pqParseInput3 will overwrite
     738             :      * our error with a complaint about that.
     739             :      */
     740           0 :     conn->inCursor = conn->inStart + 5 + msgLength;
     741             : 
     742             :     /*
     743             :      * Return zero to allow input parsing to continue.  Essentially, we've
     744             :      * replaced the COMMAND_OK result with an error result, but since this
     745             :      * doesn't affect the protocol state, it's fine.
     746             :      */
     747           0 :     return 0;
     748             : }
     749             : 
     750             : /*
     751             :  * parseInput subroutine to read a 'D' (row data) message.
     752             :  * We fill rowbuf with column pointers and then call the row processor.
     753             :  * Returns: 0 if processed message successfully, EOF to suspend parsing
     754             :  * (the latter case is not actually used currently).
     755             :  */
     756             : static int
     757     8486922 : getAnotherTuple(PGconn *conn, int msgLength)
     758             : {
     759     8486922 :     PGresult   *result = conn->result;
     760     8486922 :     int         nfields = result->numAttributes;
     761             :     const char *errmsg;
     762             :     PGdataValue *rowbuf;
     763             :     int         tupnfields;     /* # fields from tuple */
     764             :     int         vlen;           /* length of the current field value */
     765             :     int         i;
     766             : 
     767             :     /* Get the field count and make sure it's what we expect */
     768     8486922 :     if (pqGetInt(&tupnfields, 2, conn))
     769             :     {
     770             :         /* We should not run out of data here, so complain */
     771           0 :         errmsg = libpq_gettext("insufficient data in \"D\" message");
     772           0 :         goto advance_and_error;
     773             :     }
     774             : 
     775     8486922 :     if (tupnfields != nfields)
     776             :     {
     777           0 :         errmsg = libpq_gettext("unexpected field count in \"D\" message");
     778           0 :         goto advance_and_error;
     779             :     }
     780             : 
     781             :     /* Resize row buffer if needed */
     782     8486922 :     rowbuf = conn->rowBuf;
     783     8486922 :     if (nfields > conn->rowBufLen)
     784             :     {
     785         516 :         rowbuf = (PGdataValue *) realloc(rowbuf,
     786             :                                          nfields * sizeof(PGdataValue));
     787         516 :         if (!rowbuf)
     788             :         {
     789           0 :             errmsg = NULL;      /* means "out of memory", see below */
     790           0 :             goto advance_and_error;
     791             :         }
     792         516 :         conn->rowBuf = rowbuf;
     793         516 :         conn->rowBufLen = nfields;
     794             :     }
     795             : 
     796             :     /* Scan the fields */
     797    52409250 :     for (i = 0; i < nfields; i++)
     798             :     {
     799             :         /* get the value length */
     800    43922328 :         if (pqGetInt(&vlen, 4, conn))
     801             :         {
     802             :             /* We should not run out of data here, so complain */
     803           0 :             errmsg = libpq_gettext("insufficient data in \"D\" message");
     804           0 :             goto advance_and_error;
     805             :         }
     806    43922328 :         rowbuf[i].len = vlen;
     807             : 
     808             :         /*
     809             :          * rowbuf[i].value always points to the next address in the data
     810             :          * buffer even if the value is NULL.  This allows row processors to
     811             :          * estimate data sizes more easily.
     812             :          */
     813    43922328 :         rowbuf[i].value = conn->inBuffer + conn->inCursor;
     814             : 
     815             :         /* Skip over the data value */
     816    43922328 :         if (vlen > 0)
     817             :         {
     818    40827122 :             if (pqSkipnchar(vlen, conn))
     819             :             {
     820             :                 /* We should not run out of data here, so complain */
     821           0 :                 errmsg = libpq_gettext("insufficient data in \"D\" message");
     822           0 :                 goto advance_and_error;
     823             :             }
     824             :         }
     825             :     }
     826             : 
     827             :     /* Process the collected row */
     828     8486922 :     errmsg = NULL;
     829     8486922 :     if (pqRowProcessor(conn, &errmsg))
     830     8486922 :         return 0;               /* normal, successful exit */
     831             : 
     832             :     /* pqRowProcessor failed, fall through to report it */
     833             : 
     834           0 : advance_and_error:
     835             : 
     836             :     /*
     837             :      * Replace partially constructed result with an error result. First
     838             :      * discard the old result to try to win back some memory.
     839             :      */
     840           0 :     pqClearAsyncResult(conn);
     841             : 
     842             :     /*
     843             :      * If preceding code didn't provide an error message, assume "out of
     844             :      * memory" was meant.  The advantage of having this special case is that
     845             :      * freeing the old result first greatly improves the odds that gettext()
     846             :      * will succeed in providing a translation.
     847             :      */
     848           0 :     if (!errmsg)
     849           0 :         errmsg = libpq_gettext("out of memory for query result");
     850             : 
     851           0 :     appendPQExpBuffer(&conn->errorMessage, "%s\n", errmsg);
     852           0 :     pqSaveErrorResult(conn);
     853             : 
     854             :     /*
     855             :      * Show the message as fully consumed, else pqParseInput3 will overwrite
     856             :      * our error with a complaint about that.
     857             :      */
     858           0 :     conn->inCursor = conn->inStart + 5 + msgLength;
     859             : 
     860             :     /*
     861             :      * Return zero to allow input parsing to continue.  Subsequent "D"
     862             :      * messages will be ignored until we get to end of data, since an error
     863             :      * result is already set up.
     864             :      */
     865           0 :     return 0;
     866             : }
     867             : 
     868             : 
     869             : /*
     870             :  * Attempt to read an Error or Notice response message.
     871             :  * This is possible in several places, so we break it out as a subroutine.
     872             :  *
     873             :  * Entry: 'E' or 'N' message type and length have already been consumed.
     874             :  * Exit: returns 0 if successfully consumed message.
     875             :  *       returns EOF if not enough data.
     876             :  */
     877             : int
     878      199774 : pqGetErrorNotice3(PGconn *conn, bool isError)
     879             : {
     880      199774 :     PGresult   *res = NULL;
     881      199774 :     bool        have_position = false;
     882             :     PQExpBufferData workBuf;
     883             :     char        id;
     884             : 
     885             :     /* If in pipeline mode, set error indicator for it */
     886      199774 :     if (isError && conn->pipelineStatus != PQ_PIPELINE_OFF)
     887         110 :         conn->pipelineStatus = PQ_PIPELINE_ABORTED;
     888             : 
     889             :     /*
     890             :      * If this is an error message, pre-emptively clear any incomplete query
     891             :      * result we may have.  We'd just throw it away below anyway, and
     892             :      * releasing it before collecting the error might avoid out-of-memory.
     893             :      */
     894      199774 :     if (isError)
     895       43438 :         pqClearAsyncResult(conn);
     896             : 
     897             :     /*
     898             :      * Since the fields might be pretty long, we create a temporary
     899             :      * PQExpBuffer rather than using conn->workBuffer.  workBuffer is intended
     900             :      * for stuff that is expected to be short.  We shouldn't use
     901             :      * conn->errorMessage either, since this might be only a notice.
     902             :      */
     903      199774 :     initPQExpBuffer(&workBuf);
     904             : 
     905             :     /*
     906             :      * Make a PGresult to hold the accumulated fields.  We temporarily lie
     907             :      * about the result status, so that PQmakeEmptyPGresult doesn't uselessly
     908             :      * copy conn->errorMessage.
     909             :      *
     910             :      * NB: This allocation can fail, if you run out of memory. The rest of the
     911             :      * function handles that gracefully, and we still try to set the error
     912             :      * message as the connection's error message.
     913             :      */
     914      199774 :     res = PQmakeEmptyPGresult(conn, PGRES_EMPTY_QUERY);
     915      199774 :     if (res)
     916      199774 :         res->resultStatus = isError ? PGRES_FATAL_ERROR : PGRES_NONFATAL_ERROR;
     917             : 
     918             :     /*
     919             :      * Read the fields and save into res.
     920             :      *
     921             :      * While at it, save the SQLSTATE in conn->last_sqlstate, and note whether
     922             :      * we saw a PG_DIAG_STATEMENT_POSITION field.
     923             :      */
     924             :     for (;;)
     925             :     {
     926     1783458 :         if (pqGetc(&id, conn))
     927           0 :             goto fail;
     928     1783458 :         if (id == '\0')
     929      199774 :             break;              /* terminator found */
     930     1583684 :         if (pqGets(&workBuf, conn))
     931           0 :             goto fail;
     932     1583684 :         pqSaveMessageField(res, id, workBuf.data);
     933     1583684 :         if (id == PG_DIAG_SQLSTATE)
     934      199774 :             strlcpy(conn->last_sqlstate, workBuf.data,
     935             :                     sizeof(conn->last_sqlstate));
     936     1383910 :         else if (id == PG_DIAG_STATEMENT_POSITION)
     937       10278 :             have_position = true;
     938             :     }
     939             : 
     940             :     /*
     941             :      * Save the active query text, if any, into res as well; but only if we
     942             :      * might need it for an error cursor display, which is only true if there
     943             :      * is a PG_DIAG_STATEMENT_POSITION field.
     944             :      */
     945      199774 :     if (have_position && res && conn->cmd_queue_head && conn->cmd_queue_head->query)
     946       10278 :         res->errQuery = pqResultStrdup(res, conn->cmd_queue_head->query);
     947             : 
     948             :     /*
     949             :      * Now build the "overall" error message for PQresultErrorMessage.
     950             :      */
     951      199774 :     resetPQExpBuffer(&workBuf);
     952      199774 :     pqBuildErrorMessage3(&workBuf, res, conn->verbosity, conn->show_context);
     953             : 
     954             :     /*
     955             :      * Either save error as current async result, or just emit the notice.
     956             :      */
     957      199774 :     if (isError)
     958             :     {
     959       43438 :         pqClearAsyncResult(conn);   /* redundant, but be safe */
     960       43438 :         if (res)
     961             :         {
     962       43438 :             pqSetResultError(res, &workBuf, 0);
     963       43438 :             conn->result = res;
     964             :         }
     965             :         else
     966             :         {
     967             :             /* Fall back to using the internal-error processing paths */
     968           0 :             conn->error_result = true;
     969             :         }
     970             : 
     971       43438 :         if (PQExpBufferDataBroken(workBuf))
     972           0 :             libpq_append_conn_error(conn, "out of memory");
     973             :         else
     974       43438 :             appendPQExpBufferStr(&conn->errorMessage, workBuf.data);
     975             :     }
     976             :     else
     977             :     {
     978             :         /* if we couldn't allocate the result set, just discard the NOTICE */
     979      156336 :         if (res)
     980             :         {
     981             :             /*
     982             :              * We can cheat a little here and not copy the message.  But if we
     983             :              * were unlucky enough to run out of memory while filling workBuf,
     984             :              * insert "out of memory", as in pqSetResultError.
     985             :              */
     986      156336 :             if (PQExpBufferDataBroken(workBuf))
     987           0 :                 res->errMsg = libpq_gettext("out of memory\n");
     988             :             else
     989      156336 :                 res->errMsg = workBuf.data;
     990      156336 :             if (res->noticeHooks.noticeRec != NULL)
     991      156336 :                 res->noticeHooks.noticeRec(res->noticeHooks.noticeRecArg, res);
     992      156336 :             PQclear(res);
     993             :         }
     994             :     }
     995             : 
     996      199774 :     termPQExpBuffer(&workBuf);
     997      199774 :     return 0;
     998             : 
     999           0 : fail:
    1000           0 :     PQclear(res);
    1001           0 :     termPQExpBuffer(&workBuf);
    1002           0 :     return EOF;
    1003             : }
    1004             : 
    1005             : /*
    1006             :  * Construct an error message from the fields in the given PGresult,
    1007             :  * appending it to the contents of "msg".
    1008             :  */
    1009             : void
    1010      199780 : pqBuildErrorMessage3(PQExpBuffer msg, const PGresult *res,
    1011             :                      PGVerbosity verbosity, PGContextVisibility show_context)
    1012             : {
    1013             :     const char *val;
    1014      199780 :     const char *querytext = NULL;
    1015      199780 :     int         querypos = 0;
    1016             : 
    1017             :     /* If we couldn't allocate a PGresult, just say "out of memory" */
    1018      199780 :     if (res == NULL)
    1019             :     {
    1020           0 :         appendPQExpBufferStr(msg, libpq_gettext("out of memory\n"));
    1021           0 :         return;
    1022             :     }
    1023             : 
    1024             :     /*
    1025             :      * If we don't have any broken-down fields, just return the base message.
    1026             :      * This mainly applies if we're given a libpq-generated error result.
    1027             :      */
    1028      199780 :     if (res->errFields == NULL)
    1029             :     {
    1030           0 :         if (res->errMsg && res->errMsg[0])
    1031           0 :             appendPQExpBufferStr(msg, res->errMsg);
    1032             :         else
    1033           0 :             appendPQExpBufferStr(msg, libpq_gettext("no error message available\n"));
    1034           0 :         return;
    1035             :     }
    1036             : 
    1037             :     /* Else build error message from relevant fields */
    1038      199780 :     val = PQresultErrorField(res, PG_DIAG_SEVERITY);
    1039      199780 :     if (val)
    1040      199780 :         appendPQExpBuffer(msg, "%s:  ", val);
    1041             : 
    1042      199780 :     if (verbosity == PQERRORS_SQLSTATE)
    1043             :     {
    1044             :         /*
    1045             :          * If we have a SQLSTATE, print that and nothing else.  If not (which
    1046             :          * shouldn't happen for server-generated errors, but might possibly
    1047             :          * happen for libpq-generated ones), fall back to TERSE format, as
    1048             :          * that seems better than printing nothing at all.
    1049             :          */
    1050          66 :         val = PQresultErrorField(res, PG_DIAG_SQLSTATE);
    1051          66 :         if (val)
    1052             :         {
    1053          66 :             appendPQExpBuffer(msg, "%s\n", val);
    1054          66 :             return;
    1055             :         }
    1056           0 :         verbosity = PQERRORS_TERSE;
    1057             :     }
    1058             : 
    1059      199714 :     if (verbosity == PQERRORS_VERBOSE)
    1060             :     {
    1061           6 :         val = PQresultErrorField(res, PG_DIAG_SQLSTATE);
    1062           6 :         if (val)
    1063           6 :             appendPQExpBuffer(msg, "%s: ", val);
    1064             :     }
    1065      199714 :     val = PQresultErrorField(res, PG_DIAG_MESSAGE_PRIMARY);
    1066      199714 :     if (val)
    1067      199714 :         appendPQExpBufferStr(msg, val);
    1068      199714 :     val = PQresultErrorField(res, PG_DIAG_STATEMENT_POSITION);
    1069      199714 :     if (val)
    1070             :     {
    1071       10278 :         if (verbosity != PQERRORS_TERSE && res->errQuery != NULL)
    1072             :         {
    1073             :             /* emit position as a syntax cursor display */
    1074       10272 :             querytext = res->errQuery;
    1075       10272 :             querypos = atoi(val);
    1076             :         }
    1077             :         else
    1078             :         {
    1079             :             /* emit position as text addition to primary message */
    1080             :             /* translator: %s represents a digit string */
    1081           6 :             appendPQExpBuffer(msg, libpq_gettext(" at character %s"),
    1082             :                               val);
    1083             :         }
    1084             :     }
    1085             :     else
    1086             :     {
    1087      189436 :         val = PQresultErrorField(res, PG_DIAG_INTERNAL_POSITION);
    1088      189436 :         if (val)
    1089             :         {
    1090          98 :             querytext = PQresultErrorField(res, PG_DIAG_INTERNAL_QUERY);
    1091          98 :             if (verbosity != PQERRORS_TERSE && querytext != NULL)
    1092             :             {
    1093             :                 /* emit position as a syntax cursor display */
    1094          98 :                 querypos = atoi(val);
    1095             :             }
    1096             :             else
    1097             :             {
    1098             :                 /* emit position as text addition to primary message */
    1099             :                 /* translator: %s represents a digit string */
    1100           0 :                 appendPQExpBuffer(msg, libpq_gettext(" at character %s"),
    1101             :                                   val);
    1102             :             }
    1103             :         }
    1104             :     }
    1105      199714 :     appendPQExpBufferChar(msg, '\n');
    1106      199714 :     if (verbosity != PQERRORS_TERSE)
    1107             :     {
    1108      199118 :         if (querytext && querypos > 0)
    1109       10370 :             reportErrorPosition(msg, querytext, querypos,
    1110             :                                 res->client_encoding);
    1111      199118 :         val = PQresultErrorField(res, PG_DIAG_MESSAGE_DETAIL);
    1112      199118 :         if (val)
    1113       10748 :             appendPQExpBuffer(msg, libpq_gettext("DETAIL:  %s\n"), val);
    1114      199118 :         val = PQresultErrorField(res, PG_DIAG_MESSAGE_HINT);
    1115      199118 :         if (val)
    1116      134704 :             appendPQExpBuffer(msg, libpq_gettext("HINT:  %s\n"), val);
    1117      199118 :         val = PQresultErrorField(res, PG_DIAG_INTERNAL_QUERY);
    1118      199118 :         if (val)
    1119          98 :             appendPQExpBuffer(msg, libpq_gettext("QUERY:  %s\n"), val);
    1120      199118 :         if (show_context == PQSHOW_CONTEXT_ALWAYS ||
    1121      198856 :             (show_context == PQSHOW_CONTEXT_ERRORS &&
    1122      198856 :              res->resultStatus == PGRES_FATAL_ERROR))
    1123             :         {
    1124       43302 :             val = PQresultErrorField(res, PG_DIAG_CONTEXT);
    1125       43302 :             if (val)
    1126        2422 :                 appendPQExpBuffer(msg, libpq_gettext("CONTEXT:  %s\n"),
    1127             :                                   val);
    1128             :         }
    1129             :     }
    1130      199714 :     if (verbosity == PQERRORS_VERBOSE)
    1131             :     {
    1132           6 :         val = PQresultErrorField(res, PG_DIAG_SCHEMA_NAME);
    1133           6 :         if (val)
    1134           0 :             appendPQExpBuffer(msg,
    1135           0 :                               libpq_gettext("SCHEMA NAME:  %s\n"), val);
    1136           6 :         val = PQresultErrorField(res, PG_DIAG_TABLE_NAME);
    1137           6 :         if (val)
    1138           0 :             appendPQExpBuffer(msg,
    1139           0 :                               libpq_gettext("TABLE NAME:  %s\n"), val);
    1140           6 :         val = PQresultErrorField(res, PG_DIAG_COLUMN_NAME);
    1141           6 :         if (val)
    1142           0 :             appendPQExpBuffer(msg,
    1143           0 :                               libpq_gettext("COLUMN NAME:  %s\n"), val);
    1144           6 :         val = PQresultErrorField(res, PG_DIAG_DATATYPE_NAME);
    1145           6 :         if (val)
    1146           0 :             appendPQExpBuffer(msg,
    1147           0 :                               libpq_gettext("DATATYPE NAME:  %s\n"), val);
    1148           6 :         val = PQresultErrorField(res, PG_DIAG_CONSTRAINT_NAME);
    1149           6 :         if (val)
    1150           0 :             appendPQExpBuffer(msg,
    1151           0 :                               libpq_gettext("CONSTRAINT NAME:  %s\n"), val);
    1152             :     }
    1153      199714 :     if (verbosity == PQERRORS_VERBOSE)
    1154             :     {
    1155             :         const char *valf;
    1156             :         const char *vall;
    1157             : 
    1158           6 :         valf = PQresultErrorField(res, PG_DIAG_SOURCE_FILE);
    1159           6 :         vall = PQresultErrorField(res, PG_DIAG_SOURCE_LINE);
    1160           6 :         val = PQresultErrorField(res, PG_DIAG_SOURCE_FUNCTION);
    1161           6 :         if (val || valf || vall)
    1162             :         {
    1163           6 :             appendPQExpBufferStr(msg, libpq_gettext("LOCATION:  "));
    1164           6 :             if (val)
    1165           6 :                 appendPQExpBuffer(msg, libpq_gettext("%s, "), val);
    1166           6 :             if (valf && vall)   /* unlikely we'd have just one */
    1167           6 :                 appendPQExpBuffer(msg, libpq_gettext("%s:%s"),
    1168             :                                   valf, vall);
    1169           6 :             appendPQExpBufferChar(msg, '\n');
    1170             :         }
    1171             :     }
    1172             : }
    1173             : 
    1174             : /*
    1175             :  * Add an error-location display to the error message under construction.
    1176             :  *
    1177             :  * The cursor location is measured in logical characters; the query string
    1178             :  * is presumed to be in the specified encoding.
    1179             :  */
    1180             : static void
    1181       10370 : reportErrorPosition(PQExpBuffer msg, const char *query, int loc, int encoding)
    1182             : {
    1183             : #define DISPLAY_SIZE    60      /* screen width limit, in screen cols */
    1184             : #define MIN_RIGHT_CUT   10      /* try to keep this far away from EOL */
    1185             : 
    1186             :     char       *wquery;
    1187             :     int         slen,
    1188             :                 cno,
    1189             :                 i,
    1190             :                *qidx,
    1191             :                *scridx,
    1192             :                 qoffset,
    1193             :                 scroffset,
    1194             :                 ibeg,
    1195             :                 iend,
    1196             :                 loc_line;
    1197             :     bool        mb_encoding,
    1198             :                 beg_trunc,
    1199             :                 end_trunc;
    1200             : 
    1201             :     /* Convert loc from 1-based to 0-based; no-op if out of range */
    1202       10370 :     loc--;
    1203       10370 :     if (loc < 0)
    1204           0 :         return;
    1205             : 
    1206             :     /* Need a writable copy of the query */
    1207       10370 :     wquery = strdup(query);
    1208       10370 :     if (wquery == NULL)
    1209           0 :         return;                 /* fail silently if out of memory */
    1210             : 
    1211             :     /*
    1212             :      * Each character might occupy multiple physical bytes in the string, and
    1213             :      * in some Far Eastern character sets it might take more than one screen
    1214             :      * column as well.  We compute the starting byte offset and starting
    1215             :      * screen column of each logical character, and store these in qidx[] and
    1216             :      * scridx[] respectively.
    1217             :      */
    1218             : 
    1219             :     /* we need a safe allocation size... */
    1220       10370 :     slen = strlen(wquery) + 1;
    1221             : 
    1222       10370 :     qidx = (int *) malloc(slen * sizeof(int));
    1223       10370 :     if (qidx == NULL)
    1224             :     {
    1225           0 :         free(wquery);
    1226           0 :         return;
    1227             :     }
    1228       10370 :     scridx = (int *) malloc(slen * sizeof(int));
    1229       10370 :     if (scridx == NULL)
    1230             :     {
    1231           0 :         free(qidx);
    1232           0 :         free(wquery);
    1233           0 :         return;
    1234             :     }
    1235             : 
    1236             :     /* We can optimize a bit if it's a single-byte encoding */
    1237       10370 :     mb_encoding = (pg_encoding_max_length(encoding) != 1);
    1238             : 
    1239             :     /*
    1240             :      * Within the scanning loop, cno is the current character's logical
    1241             :      * number, qoffset is its offset in wquery, and scroffset is its starting
    1242             :      * logical screen column (all indexed from 0).  "loc" is the logical
    1243             :      * character number of the error location.  We scan to determine loc_line
    1244             :      * (the 1-based line number containing loc) and ibeg/iend (first character
    1245             :      * number and last+1 character number of the line containing loc). Note
    1246             :      * that qidx[] and scridx[] are filled only as far as iend.
    1247             :      */
    1248       10370 :     qoffset = 0;
    1249       10370 :     scroffset = 0;
    1250       10370 :     loc_line = 1;
    1251       10370 :     ibeg = 0;
    1252       10370 :     iend = -1;                  /* -1 means not set yet */
    1253             : 
    1254      553574 :     for (cno = 0; wquery[qoffset] != '\0'; cno++)
    1255             :     {
    1256      544350 :         char        ch = wquery[qoffset];
    1257             : 
    1258      544350 :         qidx[cno] = qoffset;
    1259      544350 :         scridx[cno] = scroffset;
    1260             : 
    1261             :         /*
    1262             :          * Replace tabs with spaces in the writable copy.  (Later we might
    1263             :          * want to think about coping with their variable screen width, but
    1264             :          * not today.)
    1265             :          */
    1266      544350 :         if (ch == '\t')
    1267         978 :             wquery[qoffset] = ' ';
    1268             : 
    1269             :         /*
    1270             :          * If end-of-line, count lines and mark positions. Each \r or \n
    1271             :          * counts as a line except when \r \n appear together.
    1272             :          */
    1273      543372 :         else if (ch == '\r' || ch == '\n')
    1274             :         {
    1275        3834 :             if (cno < loc)
    1276             :             {
    1277        2688 :                 if (ch == '\r' ||
    1278        2682 :                     cno == 0 ||
    1279        2682 :                     wquery[qidx[cno - 1]] != '\r')
    1280        2688 :                     loc_line++;
    1281             :                 /* extract beginning = last line start before loc. */
    1282        2688 :                 ibeg = cno + 1;
    1283             :             }
    1284             :             else
    1285             :             {
    1286             :                 /* set extract end. */
    1287        1146 :                 iend = cno;
    1288             :                 /* done scanning. */
    1289        1146 :                 break;
    1290             :             }
    1291             :         }
    1292             : 
    1293             :         /* Advance */
    1294      543204 :         if (mb_encoding)
    1295             :         {
    1296             :             int         w;
    1297             : 
    1298      542828 :             w = pg_encoding_dsplen(encoding, &wquery[qoffset]);
    1299             :             /* treat any non-tab control chars as width 1 */
    1300      542828 :             if (w <= 0)
    1301        2688 :                 w = 1;
    1302      542828 :             scroffset += w;
    1303      542828 :             qoffset += PQmblenBounded(&wquery[qoffset], encoding);
    1304             :         }
    1305             :         else
    1306             :         {
    1307             :             /* We assume wide chars only exist in multibyte encodings */
    1308         376 :             scroffset++;
    1309         376 :             qoffset++;
    1310             :         }
    1311             :     }
    1312             :     /* Fix up if we didn't find an end-of-line after loc */
    1313       10370 :     if (iend < 0)
    1314             :     {
    1315        9224 :         iend = cno;             /* query length in chars, +1 */
    1316        9224 :         qidx[iend] = qoffset;
    1317        9224 :         scridx[iend] = scroffset;
    1318             :     }
    1319             : 
    1320             :     /* Print only if loc is within computed query length */
    1321       10370 :     if (loc <= cno)
    1322             :     {
    1323             :         /* If the line extracted is too long, we truncate it. */
    1324       10352 :         beg_trunc = false;
    1325       10352 :         end_trunc = false;
    1326       10352 :         if (scridx[iend] - scridx[ibeg] > DISPLAY_SIZE)
    1327             :         {
    1328             :             /*
    1329             :              * We first truncate right if it is enough.  This code might be
    1330             :              * off a space or so on enforcing MIN_RIGHT_CUT if there's a wide
    1331             :              * character right there, but that should be okay.
    1332             :              */
    1333        2458 :             if (scridx[ibeg] + DISPLAY_SIZE >= scridx[loc] + MIN_RIGHT_CUT)
    1334             :             {
    1335       19446 :                 while (scridx[iend] - scridx[ibeg] > DISPLAY_SIZE)
    1336       18154 :                     iend--;
    1337        1292 :                 end_trunc = true;
    1338             :             }
    1339             :             else
    1340             :             {
    1341             :                 /* Truncate right if not too close to loc. */
    1342       13722 :                 while (scridx[loc] + MIN_RIGHT_CUT < scridx[iend])
    1343             :                 {
    1344       12556 :                     iend--;
    1345       12556 :                     end_trunc = true;
    1346             :                 }
    1347             : 
    1348             :                 /* Truncate left if still too long. */
    1349       22212 :                 while (scridx[iend] - scridx[ibeg] > DISPLAY_SIZE)
    1350             :                 {
    1351       21046 :                     ibeg++;
    1352       21046 :                     beg_trunc = true;
    1353             :                 }
    1354             :             }
    1355             :         }
    1356             : 
    1357             :         /* truncate working copy at desired endpoint */
    1358       10352 :         wquery[qidx[iend]] = '\0';
    1359             : 
    1360             :         /* Begin building the finished message. */
    1361       10352 :         i = msg->len;
    1362       10352 :         appendPQExpBuffer(msg, libpq_gettext("LINE %d: "), loc_line);
    1363       10352 :         if (beg_trunc)
    1364        1166 :             appendPQExpBufferStr(msg, "...");
    1365             : 
    1366             :         /*
    1367             :          * While we have the prefix in the msg buffer, compute its screen
    1368             :          * width.
    1369             :          */
    1370       10352 :         scroffset = 0;
    1371       96678 :         for (; i < msg->len; i += PQmblenBounded(&msg->data[i], encoding))
    1372             :         {
    1373       86326 :             int         w = pg_encoding_dsplen(encoding, &msg->data[i]);
    1374             : 
    1375       86326 :             if (w <= 0)
    1376           0 :                 w = 1;
    1377       86326 :             scroffset += w;
    1378             :         }
    1379             : 
    1380             :         /* Finish up the LINE message line. */
    1381       10352 :         appendPQExpBufferStr(msg, &wquery[qidx[ibeg]]);
    1382       10352 :         if (end_trunc)
    1383        2118 :             appendPQExpBufferStr(msg, "...");
    1384       10352 :         appendPQExpBufferChar(msg, '\n');
    1385             : 
    1386             :         /* Now emit the cursor marker line. */
    1387       10352 :         scroffset += scridx[loc] - scridx[ibeg];
    1388      330932 :         for (i = 0; i < scroffset; i++)
    1389      320580 :             appendPQExpBufferChar(msg, ' ');
    1390       10352 :         appendPQExpBufferChar(msg, '^');
    1391       10352 :         appendPQExpBufferChar(msg, '\n');
    1392             :     }
    1393             : 
    1394             :     /* Clean up. */
    1395       10370 :     free(scridx);
    1396       10370 :     free(qidx);
    1397       10370 :     free(wquery);
    1398             : }
    1399             : 
    1400             : 
    1401             : /*
    1402             :  * Attempt to read a NegotiateProtocolVersion message.  Sets conn->pversion
    1403             :  * to the version that's negotiated by the server.
    1404             :  *
    1405             :  * Entry: 'v' message type and length have already been consumed.
    1406             :  * Exit: returns 0 if successfully consumed message.
    1407             :  *       returns 1 on failure. The error message is filled in.
    1408             :  */
    1409             : int
    1410           0 : pqGetNegotiateProtocolVersion3(PGconn *conn)
    1411             : {
    1412             :     int         their_version;
    1413             :     int         num;
    1414             : 
    1415           0 :     if (pqGetInt(&their_version, 4, conn) != 0)
    1416           0 :         goto eof;
    1417             : 
    1418           0 :     if (pqGetInt(&num, 4, conn) != 0)
    1419           0 :         goto eof;
    1420             : 
    1421             :     /* Check the protocol version */
    1422           0 :     if (their_version > conn->pversion)
    1423             :     {
    1424           0 :         libpq_append_conn_error(conn, "received invalid protocol negotiation message: server requested downgrade to a higher-numbered version");
    1425           0 :         goto failure;
    1426             :     }
    1427             : 
    1428           0 :     if (their_version < PG_PROTOCOL(3, 0))
    1429             :     {
    1430           0 :         libpq_append_conn_error(conn, "received invalid protocol negotiation message: server requested downgrade to pre-3.0 protocol version");
    1431           0 :         goto failure;
    1432             :     }
    1433             : 
    1434             :     /* 3.1 never existed, we went straight from 3.0 to 3.2 */
    1435           0 :     if (their_version == PG_PROTOCOL(3, 1))
    1436             :     {
    1437           0 :         libpq_append_conn_error(conn, "received invalid protocol negotiation message: server requests downgrade to non-existent 3.1 protocol version");
    1438           0 :         goto failure;
    1439             :     }
    1440             : 
    1441           0 :     if (num < 0)
    1442             :     {
    1443           0 :         libpq_append_conn_error(conn, "received invalid protocol negotiation message: server reported negative number of unsupported parameters");
    1444           0 :         goto failure;
    1445             :     }
    1446             : 
    1447           0 :     if (their_version == conn->pversion && num == 0)
    1448             :     {
    1449           0 :         libpq_append_conn_error(conn, "received invalid protocol negotiation message: server negotiated but asks for no changes");
    1450           0 :         goto failure;
    1451             :     }
    1452             : 
    1453           0 :     if (their_version < conn->min_pversion)
    1454             :     {
    1455           0 :         libpq_append_conn_error(conn, "server only supports protocol version %d.%d, but min_protocol_version was set to %d.%d",
    1456             :                                 PG_PROTOCOL_MAJOR(their_version),
    1457             :                                 PG_PROTOCOL_MINOR(their_version),
    1458           0 :                                 PG_PROTOCOL_MAJOR(conn->min_pversion),
    1459           0 :                                 PG_PROTOCOL_MINOR(conn->min_pversion));
    1460             : 
    1461           0 :         goto failure;
    1462             :     }
    1463             : 
    1464             :     /* the version is acceptable */
    1465           0 :     conn->pversion = their_version;
    1466             : 
    1467             :     /*
    1468             :      * We don't currently request any protocol extensions, so we don't expect
    1469             :      * the server to reply with any either.
    1470             :      */
    1471           0 :     for (int i = 0; i < num; i++)
    1472             :     {
    1473           0 :         if (pqGets(&conn->workBuffer, conn))
    1474             :         {
    1475           0 :             goto eof;
    1476             :         }
    1477           0 :         if (strncmp(conn->workBuffer.data, "_pq_.", 5) != 0)
    1478             :         {
    1479           0 :             libpq_append_conn_error(conn, "received invalid protocol negotiation message: server reported unsupported parameter name without a _pq_. prefix (\"%s\")", conn->workBuffer.data);
    1480           0 :             goto failure;
    1481             :         }
    1482           0 :         libpq_append_conn_error(conn, "received invalid protocol negotiation message: server reported an unsupported parameter that was not requested (\"%s\")", conn->workBuffer.data);
    1483           0 :         goto failure;
    1484             :     }
    1485             : 
    1486           0 :     return 0;
    1487             : 
    1488           0 : eof:
    1489           0 :     libpq_append_conn_error(conn, "received invalid protocol negotiation message: message too short");
    1490           0 : failure:
    1491           0 :     conn->asyncStatus = PGASYNC_READY;
    1492           0 :     pqSaveErrorResult(conn);
    1493           0 :     return 1;
    1494             : }
    1495             : 
    1496             : 
    1497             : /*
    1498             :  * Attempt to read a ParameterStatus message.
    1499             :  * This is possible in several places, so we break it out as a subroutine.
    1500             :  *
    1501             :  * Entry: 'S' message type and length have already been consumed.
    1502             :  * Exit: returns 0 if successfully consumed message.
    1503             :  *       returns EOF if not enough data.
    1504             :  */
    1505             : static int
    1506      399448 : getParameterStatus(PGconn *conn)
    1507             : {
    1508             :     PQExpBufferData valueBuf;
    1509             : 
    1510             :     /* Get the parameter name */
    1511      399448 :     if (pqGets(&conn->workBuffer, conn))
    1512           0 :         return EOF;
    1513             :     /* Get the parameter value (could be large) */
    1514      399448 :     initPQExpBuffer(&valueBuf);
    1515      399448 :     if (pqGets(&valueBuf, conn))
    1516             :     {
    1517           0 :         termPQExpBuffer(&valueBuf);
    1518           0 :         return EOF;
    1519             :     }
    1520             :     /* And save it */
    1521      399448 :     pqSaveParameterStatus(conn, conn->workBuffer.data, valueBuf.data);
    1522      399448 :     termPQExpBuffer(&valueBuf);
    1523      399448 :     return 0;
    1524             : }
    1525             : 
    1526             : /*
    1527             :  * parseInput subroutine to read a BackendKeyData message.
    1528             :  * Entry: 'v' message type and length have already been consumed.
    1529             :  * Exit: returns 0 if successfully consumed message.
    1530             :  *       returns EOF if not enough data.
    1531             :  */
    1532             : static int
    1533       25716 : getBackendKeyData(PGconn *conn, int msgLength)
    1534             : {
    1535             :     uint8       cancel_key_len;
    1536             : 
    1537       25716 :     if (conn->be_cancel_key)
    1538             :     {
    1539           0 :         free(conn->be_cancel_key);
    1540           0 :         conn->be_cancel_key = NULL;
    1541           0 :         conn->be_cancel_key_len = 0;
    1542             :     }
    1543             : 
    1544       25716 :     if (pqGetInt(&(conn->be_pid), 4, conn))
    1545           0 :         return EOF;
    1546             : 
    1547       25716 :     cancel_key_len = 5 + msgLength - (conn->inCursor - conn->inStart);
    1548             : 
    1549       25716 :     conn->be_cancel_key = malloc(cancel_key_len);
    1550       25716 :     if (conn->be_cancel_key == NULL)
    1551             :     {
    1552           0 :         libpq_append_conn_error(conn, "out of memory");
    1553             :         /* discard the message */
    1554           0 :         return EOF;
    1555             :     }
    1556       25716 :     if (pqGetnchar(conn->be_cancel_key, cancel_key_len, conn))
    1557             :     {
    1558           0 :         free(conn->be_cancel_key);
    1559           0 :         conn->be_cancel_key = NULL;
    1560           0 :         return EOF;
    1561             :     }
    1562       25716 :     conn->be_cancel_key_len = cancel_key_len;
    1563       25716 :     return 0;
    1564             : }
    1565             : 
    1566             : 
    1567             : /*
    1568             :  * Attempt to read a Notify response message.
    1569             :  * This is possible in several places, so we break it out as a subroutine.
    1570             :  *
    1571             :  * Entry: 'A' message type and length have already been consumed.
    1572             :  * Exit: returns 0 if successfully consumed Notify message.
    1573             :  *       returns EOF if not enough data.
    1574             :  */
    1575             : static int
    1576          62 : getNotify(PGconn *conn)
    1577             : {
    1578             :     int         be_pid;
    1579             :     char       *svname;
    1580             :     int         nmlen;
    1581             :     int         extralen;
    1582             :     PGnotify   *newNotify;
    1583             : 
    1584          62 :     if (pqGetInt(&be_pid, 4, conn))
    1585           0 :         return EOF;
    1586          62 :     if (pqGets(&conn->workBuffer, conn))
    1587           0 :         return EOF;
    1588             :     /* must save name while getting extra string */
    1589          62 :     svname = strdup(conn->workBuffer.data);
    1590          62 :     if (!svname)
    1591           0 :         return EOF;
    1592          62 :     if (pqGets(&conn->workBuffer, conn))
    1593             :     {
    1594           0 :         free(svname);
    1595           0 :         return EOF;
    1596             :     }
    1597             : 
    1598             :     /*
    1599             :      * Store the strings right after the PGnotify structure so it can all be
    1600             :      * freed at once.  We don't use NAMEDATALEN because we don't want to tie
    1601             :      * this interface to a specific server name length.
    1602             :      */
    1603          62 :     nmlen = strlen(svname);
    1604          62 :     extralen = strlen(conn->workBuffer.data);
    1605          62 :     newNotify = (PGnotify *) malloc(sizeof(PGnotify) + nmlen + extralen + 2);
    1606          62 :     if (newNotify)
    1607             :     {
    1608          62 :         newNotify->relname = (char *) newNotify + sizeof(PGnotify);
    1609          62 :         strcpy(newNotify->relname, svname);
    1610          62 :         newNotify->extra = newNotify->relname + nmlen + 1;
    1611          62 :         strcpy(newNotify->extra, conn->workBuffer.data);
    1612          62 :         newNotify->be_pid = be_pid;
    1613          62 :         newNotify->next = NULL;
    1614          62 :         if (conn->notifyTail)
    1615          24 :             conn->notifyTail->next = newNotify;
    1616             :         else
    1617          38 :             conn->notifyHead = newNotify;
    1618          62 :         conn->notifyTail = newNotify;
    1619             :     }
    1620             : 
    1621          62 :     free(svname);
    1622          62 :     return 0;
    1623             : }
    1624             : 
    1625             : /*
    1626             :  * getCopyStart - process CopyInResponse, CopyOutResponse or
    1627             :  * CopyBothResponse message
    1628             :  *
    1629             :  * parseInput already read the message type and length.
    1630             :  */
    1631             : static int
    1632       16584 : getCopyStart(PGconn *conn, ExecStatusType copytype)
    1633             : {
    1634             :     PGresult   *result;
    1635             :     int         nfields;
    1636             :     int         i;
    1637             : 
    1638       16584 :     result = PQmakeEmptyPGresult(conn, copytype);
    1639       16584 :     if (!result)
    1640           0 :         goto failure;
    1641             : 
    1642       16584 :     if (pqGetc(&conn->copy_is_binary, conn))
    1643           0 :         goto failure;
    1644       16584 :     result->binary = conn->copy_is_binary;
    1645             :     /* the next two bytes are the number of fields  */
    1646       16584 :     if (pqGetInt(&(result->numAttributes), 2, conn))
    1647           0 :         goto failure;
    1648       16584 :     nfields = result->numAttributes;
    1649             : 
    1650             :     /* allocate space for the attribute descriptors */
    1651       16584 :     if (nfields > 0)
    1652             :     {
    1653       14614 :         result->attDescs = (PGresAttDesc *)
    1654       14614 :             pqResultAlloc(result, nfields * sizeof(PGresAttDesc), true);
    1655       14614 :         if (!result->attDescs)
    1656           0 :             goto failure;
    1657      156406 :         MemSet(result->attDescs, 0, nfields * sizeof(PGresAttDesc));
    1658             :     }
    1659             : 
    1660       71020 :     for (i = 0; i < nfields; i++)
    1661             :     {
    1662             :         int         format;
    1663             : 
    1664       54436 :         if (pqGetInt(&format, 2, conn))
    1665           0 :             goto failure;
    1666             : 
    1667             :         /*
    1668             :          * Since pqGetInt treats 2-byte integers as unsigned, we need to
    1669             :          * coerce these results to signed form.
    1670             :          */
    1671       54436 :         format = (int) ((int16) format);
    1672       54436 :         result->attDescs[i].format = format;
    1673             :     }
    1674             : 
    1675             :     /* Success! */
    1676       16584 :     conn->result = result;
    1677       16584 :     return 0;
    1678             : 
    1679           0 : failure:
    1680           0 :     PQclear(result);
    1681           0 :     return EOF;
    1682             : }
    1683             : 
    1684             : /*
    1685             :  * getReadyForQuery - process ReadyForQuery message
    1686             :  */
    1687             : static int
    1688      690508 : getReadyForQuery(PGconn *conn)
    1689             : {
    1690             :     char        xact_status;
    1691             : 
    1692      690508 :     if (pqGetc(&xact_status, conn))
    1693           0 :         return EOF;
    1694      690508 :     switch (xact_status)
    1695             :     {
    1696      509746 :         case 'I':
    1697      509746 :             conn->xactStatus = PQTRANS_IDLE;
    1698      509746 :             break;
    1699      178970 :         case 'T':
    1700      178970 :             conn->xactStatus = PQTRANS_INTRANS;
    1701      178970 :             break;
    1702        1792 :         case 'E':
    1703        1792 :             conn->xactStatus = PQTRANS_INERROR;
    1704        1792 :             break;
    1705           0 :         default:
    1706           0 :             conn->xactStatus = PQTRANS_UNKNOWN;
    1707           0 :             break;
    1708             :     }
    1709             : 
    1710      690508 :     return 0;
    1711             : }
    1712             : 
    1713             : /*
    1714             :  * getCopyDataMessage - fetch next CopyData message, process async messages
    1715             :  *
    1716             :  * Returns length word of CopyData message (> 0), or 0 if no complete
    1717             :  * message available, -1 if end of copy, -2 if error.
    1718             :  */
    1719             : static int
    1720     8309128 : getCopyDataMessage(PGconn *conn)
    1721             : {
    1722             :     char        id;
    1723             :     int         msgLength;
    1724             :     int         avail;
    1725             : 
    1726             :     for (;;)
    1727             :     {
    1728             :         /*
    1729             :          * Do we have the next input message?  To make life simpler for async
    1730             :          * callers, we keep returning 0 until the next message is fully
    1731             :          * available, even if it is not Copy Data.
    1732             :          */
    1733     8309128 :         conn->inCursor = conn->inStart;
    1734     8309128 :         if (pqGetc(&id, conn))
    1735      495502 :             return 0;
    1736     7813626 :         if (pqGetInt(&msgLength, 4, conn))
    1737        2658 :             return 0;
    1738     7810968 :         if (msgLength < 4)
    1739             :         {
    1740           0 :             handleSyncLoss(conn, id, msgLength);
    1741           0 :             return -2;
    1742             :         }
    1743     7810968 :         avail = conn->inEnd - conn->inCursor;
    1744     7810968 :         if (avail < msgLength - 4)
    1745             :         {
    1746             :             /*
    1747             :              * Before returning, enlarge the input buffer if needed to hold
    1748             :              * the whole message.  See notes in parseInput.
    1749             :              */
    1750      394222 :             if (pqCheckInBufferSpace(conn->inCursor + (size_t) msgLength - 4,
    1751             :                                      conn))
    1752             :             {
    1753             :                 /*
    1754             :                  * XXX add some better recovery code... plan is to skip over
    1755             :                  * the message using its length, then report an error. For the
    1756             :                  * moment, just treat this like loss of sync (which indeed it
    1757             :                  * might be!)
    1758             :                  */
    1759           0 :                 handleSyncLoss(conn, id, msgLength);
    1760           0 :                 return -2;
    1761             :             }
    1762      394222 :             return 0;
    1763             :         }
    1764             : 
    1765             :         /*
    1766             :          * If it's a legitimate async message type, process it.  (NOTIFY
    1767             :          * messages are not currently possible here, but we handle them for
    1768             :          * completeness.)  Otherwise, if it's anything except Copy Data,
    1769             :          * report end-of-copy.
    1770             :          */
    1771     7416746 :         switch (id)
    1772             :         {
    1773           0 :             case PqMsg_NotificationResponse:
    1774           0 :                 if (getNotify(conn))
    1775           0 :                     return 0;
    1776           0 :                 break;
    1777          64 :             case PqMsg_NoticeResponse:
    1778          64 :                 if (pqGetErrorNotice3(conn, false))
    1779           0 :                     return 0;
    1780          64 :                 break;
    1781           0 :             case PqMsg_ParameterStatus:
    1782           0 :                 if (getParameterStatus(conn))
    1783           0 :                     return 0;
    1784           0 :                 break;
    1785     7403296 :             case PqMsg_CopyData:
    1786     7403296 :                 return msgLength;
    1787       13290 :             case PqMsg_CopyDone:
    1788             : 
    1789             :                 /*
    1790             :                  * If this is a CopyDone message, exit COPY_OUT mode and let
    1791             :                  * caller read status with PQgetResult().  If we're in
    1792             :                  * COPY_BOTH mode, return to COPY_IN mode.
    1793             :                  */
    1794       13290 :                 if (conn->asyncStatus == PGASYNC_COPY_BOTH)
    1795          26 :                     conn->asyncStatus = PGASYNC_COPY_IN;
    1796             :                 else
    1797       13264 :                     conn->asyncStatus = PGASYNC_BUSY;
    1798       13290 :                 return -1;
    1799          96 :             default:            /* treat as end of copy */
    1800             : 
    1801             :                 /*
    1802             :                  * Any other message terminates either COPY_IN or COPY_BOTH
    1803             :                  * mode.
    1804             :                  */
    1805          96 :                 conn->asyncStatus = PGASYNC_BUSY;
    1806          96 :                 return -1;
    1807             :         }
    1808             : 
    1809             :         /* Drop the processed message and loop around for another */
    1810          64 :         pqParseDone(conn, conn->inCursor);
    1811             :     }
    1812             : }
    1813             : 
    1814             : /*
    1815             :  * PQgetCopyData - read a row of data from the backend during COPY OUT
    1816             :  * or COPY BOTH
    1817             :  *
    1818             :  * If successful, sets *buffer to point to a malloc'd row of data, and
    1819             :  * returns row length (always > 0) as result.
    1820             :  * Returns 0 if no row available yet (only possible if async is true),
    1821             :  * -1 if end of copy (consult PQgetResult), or -2 if error (consult
    1822             :  * PQerrorMessage).
    1823             :  */
    1824             : int
    1825     8309064 : pqGetCopyData3(PGconn *conn, char **buffer, int async)
    1826             : {
    1827             :     int         msgLength;
    1828             : 
    1829             :     for (;;)
    1830             :     {
    1831             :         /*
    1832             :          * Collect the next input message.  To make life simpler for async
    1833             :          * callers, we keep returning 0 until the next message is fully
    1834             :          * available, even if it is not Copy Data.
    1835             :          */
    1836     8309064 :         msgLength = getCopyDataMessage(conn);
    1837     8309064 :         if (msgLength < 0)
    1838       13386 :             return msgLength;   /* end-of-copy or error */
    1839     8295678 :         if (msgLength == 0)
    1840             :         {
    1841             :             /* Don't block if async read requested */
    1842      892382 :             if (async)
    1843      568790 :                 return 0;
    1844             :             /* Need to load more data */
    1845      647184 :             if (pqWait(true, false, conn) ||
    1846      323592 :                 pqReadData(conn) < 0)
    1847           0 :                 return -2;
    1848      323592 :             continue;
    1849             :         }
    1850             : 
    1851             :         /*
    1852             :          * Drop zero-length messages (shouldn't happen anyway).  Otherwise
    1853             :          * pass the data back to the caller.
    1854             :          */
    1855     7403296 :         msgLength -= 4;
    1856     7403296 :         if (msgLength > 0)
    1857             :         {
    1858     7403296 :             *buffer = (char *) malloc(msgLength + 1);
    1859     7403296 :             if (*buffer == NULL)
    1860             :             {
    1861           0 :                 libpq_append_conn_error(conn, "out of memory");
    1862           0 :                 return -2;
    1863             :             }
    1864     7403296 :             memcpy(*buffer, &conn->inBuffer[conn->inCursor], msgLength);
    1865     7403296 :             (*buffer)[msgLength] = '\0';    /* Add terminating null */
    1866             : 
    1867             :             /* Mark message consumed */
    1868     7403296 :             pqParseDone(conn, conn->inCursor + msgLength);
    1869             : 
    1870     7403296 :             return msgLength;
    1871             :         }
    1872             : 
    1873             :         /* Empty, so drop it and loop around for another */
    1874           0 :         pqParseDone(conn, conn->inCursor);
    1875             :     }
    1876             : }
    1877             : 
    1878             : /*
    1879             :  * PQgetline - gets a newline-terminated string from the backend.
    1880             :  *
    1881             :  * See fe-exec.c for documentation.
    1882             :  */
    1883             : int
    1884           0 : pqGetline3(PGconn *conn, char *s, int maxlen)
    1885             : {
    1886             :     int         status;
    1887             : 
    1888           0 :     if (conn->sock == PGINVALID_SOCKET ||
    1889           0 :         (conn->asyncStatus != PGASYNC_COPY_OUT &&
    1890           0 :          conn->asyncStatus != PGASYNC_COPY_BOTH) ||
    1891           0 :         conn->copy_is_binary)
    1892             :     {
    1893           0 :         libpq_append_conn_error(conn, "PQgetline: not doing text COPY OUT");
    1894           0 :         *s = '\0';
    1895           0 :         return EOF;
    1896             :     }
    1897             : 
    1898           0 :     while ((status = PQgetlineAsync(conn, s, maxlen - 1)) == 0)
    1899             :     {
    1900             :         /* need to load more data */
    1901           0 :         if (pqWait(true, false, conn) ||
    1902           0 :             pqReadData(conn) < 0)
    1903             :         {
    1904           0 :             *s = '\0';
    1905           0 :             return EOF;
    1906             :         }
    1907             :     }
    1908             : 
    1909           0 :     if (status < 0)
    1910             :     {
    1911             :         /* End of copy detected; gin up old-style terminator */
    1912           0 :         strcpy(s, "\\.");
    1913           0 :         return 0;
    1914             :     }
    1915             : 
    1916             :     /* Add null terminator, and strip trailing \n if present */
    1917           0 :     if (s[status - 1] == '\n')
    1918             :     {
    1919           0 :         s[status - 1] = '\0';
    1920           0 :         return 0;
    1921             :     }
    1922             :     else
    1923             :     {
    1924           0 :         s[status] = '\0';
    1925           0 :         return 1;
    1926             :     }
    1927             : }
    1928             : 
    1929             : /*
    1930             :  * PQgetlineAsync - gets a COPY data row without blocking.
    1931             :  *
    1932             :  * See fe-exec.c for documentation.
    1933             :  */
    1934             : int
    1935           0 : pqGetlineAsync3(PGconn *conn, char *buffer, int bufsize)
    1936             : {
    1937             :     int         msgLength;
    1938             :     int         avail;
    1939             : 
    1940           0 :     if (conn->asyncStatus != PGASYNC_COPY_OUT
    1941           0 :         && conn->asyncStatus != PGASYNC_COPY_BOTH)
    1942           0 :         return -1;              /* we are not doing a copy... */
    1943             : 
    1944             :     /*
    1945             :      * Recognize the next input message.  To make life simpler for async
    1946             :      * callers, we keep returning 0 until the next message is fully available
    1947             :      * even if it is not Copy Data.  This should keep PQendcopy from blocking.
    1948             :      * (Note: unlike pqGetCopyData3, we do not change asyncStatus here.)
    1949             :      */
    1950           0 :     msgLength = getCopyDataMessage(conn);
    1951           0 :     if (msgLength < 0)
    1952           0 :         return -1;              /* end-of-copy or error */
    1953           0 :     if (msgLength == 0)
    1954           0 :         return 0;               /* no data yet */
    1955             : 
    1956             :     /*
    1957             :      * Move data from libpq's buffer to the caller's.  In the case where a
    1958             :      * prior call found the caller's buffer too small, we use
    1959             :      * conn->copy_already_done to remember how much of the row was already
    1960             :      * returned to the caller.
    1961             :      */
    1962           0 :     conn->inCursor += conn->copy_already_done;
    1963           0 :     avail = msgLength - 4 - conn->copy_already_done;
    1964           0 :     if (avail <= bufsize)
    1965             :     {
    1966             :         /* Able to consume the whole message */
    1967           0 :         memcpy(buffer, &conn->inBuffer[conn->inCursor], avail);
    1968             :         /* Mark message consumed */
    1969           0 :         conn->inStart = conn->inCursor + avail;
    1970             :         /* Reset state for next time */
    1971           0 :         conn->copy_already_done = 0;
    1972           0 :         return avail;
    1973             :     }
    1974             :     else
    1975             :     {
    1976             :         /* We must return a partial message */
    1977           0 :         memcpy(buffer, &conn->inBuffer[conn->inCursor], bufsize);
    1978             :         /* The message is NOT consumed from libpq's buffer */
    1979           0 :         conn->copy_already_done += bufsize;
    1980           0 :         return bufsize;
    1981             :     }
    1982             : }
    1983             : 
    1984             : /*
    1985             :  * PQendcopy
    1986             :  *
    1987             :  * See fe-exec.c for documentation.
    1988             :  */
    1989             : int
    1990         374 : pqEndcopy3(PGconn *conn)
    1991             : {
    1992             :     PGresult   *result;
    1993             : 
    1994         374 :     if (conn->asyncStatus != PGASYNC_COPY_IN &&
    1995         362 :         conn->asyncStatus != PGASYNC_COPY_OUT &&
    1996           0 :         conn->asyncStatus != PGASYNC_COPY_BOTH)
    1997             :     {
    1998           0 :         libpq_append_conn_error(conn, "no COPY in progress");
    1999           0 :         return 1;
    2000             :     }
    2001             : 
    2002             :     /* Send the CopyDone message if needed */
    2003         374 :     if (conn->asyncStatus == PGASYNC_COPY_IN ||
    2004         362 :         conn->asyncStatus == PGASYNC_COPY_BOTH)
    2005             :     {
    2006          24 :         if (pqPutMsgStart(PqMsg_CopyDone, conn) < 0 ||
    2007          12 :             pqPutMsgEnd(conn) < 0)
    2008           0 :             return 1;
    2009             : 
    2010             :         /*
    2011             :          * If we sent the COPY command in extended-query mode, we must issue a
    2012             :          * Sync as well.
    2013             :          */
    2014          12 :         if (conn->cmd_queue_head &&
    2015          12 :             conn->cmd_queue_head->queryclass != PGQUERY_SIMPLE)
    2016             :         {
    2017           0 :             if (pqPutMsgStart(PqMsg_Sync, conn) < 0 ||
    2018           0 :                 pqPutMsgEnd(conn) < 0)
    2019           0 :                 return 1;
    2020             :         }
    2021             :     }
    2022             : 
    2023             :     /*
    2024             :      * make sure no data is waiting to be sent, abort if we are non-blocking
    2025             :      * and the flush fails
    2026             :      */
    2027         374 :     if (pqFlush(conn) && pqIsnonblocking(conn))
    2028           0 :         return 1;
    2029             : 
    2030             :     /* Return to active duty */
    2031         374 :     conn->asyncStatus = PGASYNC_BUSY;
    2032             : 
    2033             :     /*
    2034             :      * Non blocking connections may have to abort at this point.  If everyone
    2035             :      * played the game there should be no problem, but in error scenarios the
    2036             :      * expected messages may not have arrived yet.  (We are assuming that the
    2037             :      * backend's packetizing will ensure that CommandComplete arrives along
    2038             :      * with the CopyDone; are there corner cases where that doesn't happen?)
    2039             :      */
    2040         374 :     if (pqIsnonblocking(conn) && PQisBusy(conn))
    2041           0 :         return 1;
    2042             : 
    2043             :     /* Wait for the completion response */
    2044         374 :     result = PQgetResult(conn);
    2045             : 
    2046             :     /* Expecting a successful result */
    2047         374 :     if (result && result->resultStatus == PGRES_COMMAND_OK)
    2048             :     {
    2049         374 :         PQclear(result);
    2050         374 :         return 0;
    2051             :     }
    2052             : 
    2053             :     /*
    2054             :      * Trouble. For backwards-compatibility reasons, we issue the error
    2055             :      * message as if it were a notice (would be nice to get rid of this
    2056             :      * silliness, but too many apps probably don't handle errors from
    2057             :      * PQendcopy reasonably).  Note that the app can still obtain the error
    2058             :      * status from the PGconn object.
    2059             :      */
    2060           0 :     if (conn->errorMessage.len > 0)
    2061             :     {
    2062             :         /* We have to strip the trailing newline ... pain in neck... */
    2063           0 :         char        svLast = conn->errorMessage.data[conn->errorMessage.len - 1];
    2064             : 
    2065           0 :         if (svLast == '\n')
    2066           0 :             conn->errorMessage.data[conn->errorMessage.len - 1] = '\0';
    2067           0 :         pqInternalNotice(&conn->noticeHooks, "%s", conn->errorMessage.data);
    2068           0 :         conn->errorMessage.data[conn->errorMessage.len - 1] = svLast;
    2069             :     }
    2070             : 
    2071           0 :     PQclear(result);
    2072             : 
    2073           0 :     return 1;
    2074             : }
    2075             : 
    2076             : 
    2077             : /*
    2078             :  * PQfn - Send a function call to the POSTGRES backend.
    2079             :  *
    2080             :  * See fe-exec.c for documentation.
    2081             :  */
    2082             : PGresult *
    2083        2208 : pqFunctionCall3(PGconn *conn, Oid fnid,
    2084             :                 int *result_buf, int *actual_result_len,
    2085             :                 int result_is_int,
    2086             :                 const PQArgBlock *args, int nargs)
    2087             : {
    2088        2208 :     bool        needInput = false;
    2089        2208 :     ExecStatusType status = PGRES_FATAL_ERROR;
    2090             :     char        id;
    2091             :     int         msgLength;
    2092             :     int         avail;
    2093             :     int         i;
    2094             : 
    2095             :     /* already validated by PQfn */
    2096             :     Assert(conn->pipelineStatus == PQ_PIPELINE_OFF);
    2097             : 
    2098             :     /* PQfn already validated connection state */
    2099             : 
    2100        4416 :     if (pqPutMsgStart(PqMsg_FunctionCall, conn) < 0 ||
    2101        4416 :         pqPutInt(fnid, 4, conn) < 0 ||   /* function id */
    2102        4416 :         pqPutInt(1, 2, conn) < 0 || /* # of format codes */
    2103        4416 :         pqPutInt(1, 2, conn) < 0 || /* format code: BINARY */
    2104        2208 :         pqPutInt(nargs, 2, conn) < 0)    /* # of args */
    2105             :     {
    2106             :         /* error message should be set up already */
    2107           0 :         return NULL;
    2108             :     }
    2109             : 
    2110        6382 :     for (i = 0; i < nargs; ++i)
    2111             :     {                           /* len.int4 + contents     */
    2112        4174 :         if (pqPutInt(args[i].len, 4, conn))
    2113           0 :             return NULL;
    2114        4174 :         if (args[i].len == -1)
    2115           0 :             continue;           /* it's NULL */
    2116             : 
    2117        4174 :         if (args[i].isint)
    2118             :         {
    2119        3184 :             if (pqPutInt(args[i].u.integer, args[i].len, conn))
    2120           0 :                 return NULL;
    2121             :         }
    2122             :         else
    2123             :         {
    2124         990 :             if (pqPutnchar((char *) args[i].u.ptr, args[i].len, conn))
    2125           0 :                 return NULL;
    2126             :         }
    2127             :     }
    2128             : 
    2129        2208 :     if (pqPutInt(1, 2, conn) < 0)    /* result format code: BINARY */
    2130           0 :         return NULL;
    2131             : 
    2132        4416 :     if (pqPutMsgEnd(conn) < 0 ||
    2133        2208 :         pqFlush(conn))
    2134           0 :         return NULL;
    2135             : 
    2136             :     for (;;)
    2137             :     {
    2138        6990 :         if (needInput)
    2139             :         {
    2140             :             /* Wait for some data to arrive (or for the channel to close) */
    2141        5148 :             if (pqWait(true, false, conn) ||
    2142        2574 :                 pqReadData(conn) < 0)
    2143             :                 break;
    2144             :         }
    2145             : 
    2146             :         /*
    2147             :          * Scan the message. If we run out of data, loop around to try again.
    2148             :          */
    2149        6990 :         needInput = true;
    2150             : 
    2151        6990 :         conn->inCursor = conn->inStart;
    2152        6990 :         if (pqGetc(&id, conn))
    2153        2208 :             continue;
    2154        4782 :         if (pqGetInt(&msgLength, 4, conn))
    2155           0 :             continue;
    2156             : 
    2157             :         /*
    2158             :          * Try to validate message type/length here.  A length less than 4 is
    2159             :          * definitely broken.  Large lengths should only be believed for a few
    2160             :          * message types.
    2161             :          */
    2162        4782 :         if (msgLength < 4)
    2163             :         {
    2164           0 :             handleSyncLoss(conn, id, msgLength);
    2165           0 :             break;
    2166             :         }
    2167        4782 :         if (msgLength > 30000 && !VALID_LONG_MESSAGE_TYPE(id))
    2168             :         {
    2169           0 :             handleSyncLoss(conn, id, msgLength);
    2170           0 :             break;
    2171             :         }
    2172             : 
    2173             :         /*
    2174             :          * Can't process if message body isn't all here yet.
    2175             :          */
    2176        4782 :         msgLength -= 4;
    2177        4782 :         avail = conn->inEnd - conn->inCursor;
    2178        4782 :         if (avail < msgLength)
    2179             :         {
    2180             :             /*
    2181             :              * Before looping, enlarge the input buffer if needed to hold the
    2182             :              * whole message.  See notes in parseInput.
    2183             :              */
    2184         366 :             if (pqCheckInBufferSpace(conn->inCursor + (size_t) msgLength,
    2185             :                                      conn))
    2186             :             {
    2187             :                 /*
    2188             :                  * XXX add some better recovery code... plan is to skip over
    2189             :                  * the message using its length, then report an error. For the
    2190             :                  * moment, just treat this like loss of sync (which indeed it
    2191             :                  * might be!)
    2192             :                  */
    2193           0 :                 handleSyncLoss(conn, id, msgLength);
    2194           0 :                 break;
    2195             :             }
    2196         366 :             continue;
    2197             :         }
    2198             : 
    2199             :         /*
    2200             :          * We should see V or E response to the command, but might get N
    2201             :          * and/or A notices first. We also need to swallow the final Z before
    2202             :          * returning.
    2203             :          */
    2204        4416 :         switch (id)
    2205             :         {
    2206        2208 :             case 'V':           /* function result */
    2207        2208 :                 if (pqGetInt(actual_result_len, 4, conn))
    2208           0 :                     continue;
    2209        2208 :                 if (*actual_result_len != -1)
    2210             :                 {
    2211        2208 :                     if (result_is_int)
    2212             :                     {
    2213        1436 :                         if (pqGetInt(result_buf, *actual_result_len, conn))
    2214           0 :                             continue;
    2215             :                     }
    2216             :                     else
    2217             :                     {
    2218         772 :                         if (pqGetnchar((char *) result_buf,
    2219         772 :                                        *actual_result_len,
    2220             :                                        conn))
    2221           0 :                             continue;
    2222             :                     }
    2223             :                 }
    2224             :                 /* correctly finished function result message */
    2225        2208 :                 status = PGRES_COMMAND_OK;
    2226        2208 :                 break;
    2227           0 :             case 'E':           /* error return */
    2228           0 :                 if (pqGetErrorNotice3(conn, true))
    2229           0 :                     continue;
    2230           0 :                 status = PGRES_FATAL_ERROR;
    2231           0 :                 break;
    2232           0 :             case 'A':           /* notify message */
    2233             :                 /* handle notify and go back to processing return values */
    2234           0 :                 if (getNotify(conn))
    2235           0 :                     continue;
    2236           0 :                 break;
    2237           0 :             case 'N':           /* notice */
    2238             :                 /* handle notice and go back to processing return values */
    2239           0 :                 if (pqGetErrorNotice3(conn, false))
    2240           0 :                     continue;
    2241           0 :                 break;
    2242        2208 :             case 'Z':           /* backend is ready for new query */
    2243        2208 :                 if (getReadyForQuery(conn))
    2244           0 :                     continue;
    2245             : 
    2246             :                 /* consume the message */
    2247        2208 :                 pqParseDone(conn, conn->inStart + 5 + msgLength);
    2248             : 
    2249             :                 /*
    2250             :                  * If we already have a result object (probably an error), use
    2251             :                  * that.  Otherwise, if we saw a function result message,
    2252             :                  * report COMMAND_OK.  Otherwise, the backend violated the
    2253             :                  * protocol, so complain.
    2254             :                  */
    2255        2208 :                 if (!pgHavePendingResult(conn))
    2256             :                 {
    2257        2208 :                     if (status == PGRES_COMMAND_OK)
    2258             :                     {
    2259        2208 :                         conn->result = PQmakeEmptyPGresult(conn, status);
    2260        2208 :                         if (!conn->result)
    2261             :                         {
    2262           0 :                             libpq_append_conn_error(conn, "out of memory");
    2263           0 :                             pqSaveErrorResult(conn);
    2264             :                         }
    2265             :                     }
    2266             :                     else
    2267             :                     {
    2268           0 :                         libpq_append_conn_error(conn, "protocol error: no function result");
    2269           0 :                         pqSaveErrorResult(conn);
    2270             :                     }
    2271             :                 }
    2272             :                 /* and we're out */
    2273        2208 :                 return pqPrepareAsyncResult(conn);
    2274           0 :             case 'S':           /* parameter status */
    2275           0 :                 if (getParameterStatus(conn))
    2276           0 :                     continue;
    2277           0 :                 break;
    2278           0 :             default:
    2279             :                 /* The backend violates the protocol. */
    2280           0 :                 libpq_append_conn_error(conn, "protocol error: id=0x%x", id);
    2281           0 :                 pqSaveErrorResult(conn);
    2282             : 
    2283             :                 /*
    2284             :                  * We can't call parsing done due to the protocol violation
    2285             :                  * (so message tracing wouldn't work), but trust the specified
    2286             :                  * message length as what to skip.
    2287             :                  */
    2288           0 :                 conn->inStart += 5 + msgLength;
    2289           0 :                 return pqPrepareAsyncResult(conn);
    2290             :         }
    2291             : 
    2292             :         /* Completed parsing this message, keep going */
    2293        2208 :         pqParseDone(conn, conn->inStart + 5 + msgLength);
    2294        2208 :         needInput = false;
    2295             :     }
    2296             : 
    2297             :     /*
    2298             :      * We fall out of the loop only upon failing to read data.
    2299             :      * conn->errorMessage has been set by pqWait or pqReadData. We want to
    2300             :      * append it to any already-received error message.
    2301             :      */
    2302           0 :     pqSaveErrorResult(conn);
    2303           0 :     return pqPrepareAsyncResult(conn);
    2304             : }
    2305             : 
    2306             : 
    2307             : /*
    2308             :  * Construct startup packet
    2309             :  *
    2310             :  * Returns a malloc'd packet buffer, or NULL if out of memory
    2311             :  */
    2312             : char *
    2313       26230 : pqBuildStartupPacket3(PGconn *conn, int *packetlen,
    2314             :                       const PQEnvironmentOption *options)
    2315             : {
    2316             :     char       *startpacket;
    2317             : 
    2318       26230 :     *packetlen = build_startup_packet(conn, NULL, options);
    2319       26230 :     startpacket = (char *) malloc(*packetlen);
    2320       26230 :     if (!startpacket)
    2321           0 :         return NULL;
    2322       26230 :     *packetlen = build_startup_packet(conn, startpacket, options);
    2323       26230 :     return startpacket;
    2324             : }
    2325             : 
    2326             : /*
    2327             :  * Build a startup packet given a filled-in PGconn structure.
    2328             :  *
    2329             :  * We need to figure out how much space is needed, then fill it in.
    2330             :  * To avoid duplicate logic, this routine is called twice: the first time
    2331             :  * (with packet == NULL) just counts the space needed, the second time
    2332             :  * (with packet == allocated space) fills it in.  Return value is the number
    2333             :  * of bytes used.
    2334             :  */
    2335             : static int
    2336       52460 : build_startup_packet(const PGconn *conn, char *packet,
    2337             :                      const PQEnvironmentOption *options)
    2338             : {
    2339       52460 :     int         packet_len = 0;
    2340             :     const PQEnvironmentOption *next_eo;
    2341             :     const char *val;
    2342             : 
    2343             :     /* Protocol version comes first. */
    2344       52460 :     if (packet)
    2345             :     {
    2346       26230 :         ProtocolVersion pv = pg_hton32(conn->pversion);
    2347             : 
    2348       26230 :         memcpy(packet + packet_len, &pv, sizeof(ProtocolVersion));
    2349             :     }
    2350       52460 :     packet_len += sizeof(ProtocolVersion);
    2351             : 
    2352             :     /* Add user name, database name, options */
    2353             : 
    2354             : #define ADD_STARTUP_OPTION(optname, optval) \
    2355             :     do { \
    2356             :         if (packet) \
    2357             :             strcpy(packet + packet_len, optname); \
    2358             :         packet_len += strlen(optname) + 1; \
    2359             :         if (packet) \
    2360             :             strcpy(packet + packet_len, optval); \
    2361             :         packet_len += strlen(optval) + 1; \
    2362             :     } while(0)
    2363             : 
    2364       52460 :     if (conn->pguser && conn->pguser[0])
    2365       52460 :         ADD_STARTUP_OPTION("user", conn->pguser);
    2366       52460 :     if (conn->dbName && conn->dbName[0])
    2367       52460 :         ADD_STARTUP_OPTION("database", conn->dbName);
    2368       52460 :     if (conn->replication && conn->replication[0])
    2369        5784 :         ADD_STARTUP_OPTION("replication", conn->replication);
    2370       52460 :     if (conn->pgoptions && conn->pgoptions[0])
    2371       14692 :         ADD_STARTUP_OPTION("options", conn->pgoptions);
    2372       52460 :     if (conn->send_appname)
    2373             :     {
    2374             :         /* Use appname if present, otherwise use fallback */
    2375       52460 :         val = conn->appname ? conn->appname : conn->fbappname;
    2376       52460 :         if (val && val[0])
    2377       52444 :             ADD_STARTUP_OPTION("application_name", val);
    2378             :     }
    2379             : 
    2380       52460 :     if (conn->client_encoding_initial && conn->client_encoding_initial[0])
    2381        3136 :         ADD_STARTUP_OPTION("client_encoding", conn->client_encoding_initial);
    2382             : 
    2383             :     /* Add any environment-driven GUC settings needed */
    2384      209840 :     for (next_eo = options; next_eo->envName; next_eo++)
    2385             :     {
    2386      157380 :         if ((val = getenv(next_eo->envName)) != NULL)
    2387             :         {
    2388       18232 :             if (pg_strcasecmp(val, "default") != 0)
    2389       18232 :                 ADD_STARTUP_OPTION(next_eo->pgName, val);
    2390             :         }
    2391             :     }
    2392             : 
    2393             :     /* Add trailing terminator */
    2394       52460 :     if (packet)
    2395       26230 :         packet[packet_len] = '\0';
    2396       52460 :     packet_len++;
    2397             : 
    2398       52460 :     return packet_len;
    2399             : }

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