Line data    Source code

       1             : /*-------------------------------------------------------------------------
       2             :  *
       3             :  * stringinfo_mb.c
       4             :  *      Multibyte encoding-aware additional StringInfo facilities
       5             :  *
       6             :  * This is separate from common/stringinfo.c so that frontend users
       7             :  * of that file need not pull in unnecessary multibyte-encoding support
       8             :  * code.
       9             :  *
      10             :  *
      11             :  * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
      12             :  * Portions Copyright (c) 1994, Regents of the University of California
      13             :  *
      14             :  *
      15             :  * IDENTIFICATION
      16             :  *    src/backend/utils/mb/stringinfo_mb.c
      17             :  *
      18             :  *-------------------------------------------------------------------------
      19             :  */
      20             : #include "postgres.h"
      21             : 
      22             : #include "mb/pg_wchar.h"
      23             : #include "mb/stringinfo_mb.h"
      24             : 
      25             : 
      26             : /*
      27             :  * appendStringInfoStringQuoted
      28             :  *
      29             :  * Append up to maxlen bytes from s to str, or the whole input string if
      30             :  * maxlen < 0, adding single quotes around it and doubling all single quotes.
      31             :  * Add an ellipsis if the copy is incomplete.
      32             :  */
      33             : void
      34        8136 : appendStringInfoStringQuoted(StringInfo str, const char *s, int maxlen)
      35             : {
      36        8136 :     char       *copy = NULL;
      37             :     const char *chunk_search_start,
      38             :                *chunk_copy_start,
      39             :                *chunk_end;
      40             :     int         slen;
      41             :     bool        ellipsis;
      42             : 
      43             :     Assert(str != NULL);
      44             : 
      45        8136 :     slen = strlen(s);
      46        8136 :     if (maxlen >= 0 && maxlen < slen)
      47          12 :     {
      48          12 :         int         finallen = pg_mbcliplen(s, slen, maxlen);
      49             : 
      50          12 :         copy = pnstrdup(s, finallen);
      51          12 :         chunk_search_start = copy;
      52          12 :         chunk_copy_start = copy;
      53             : 
      54          12 :         ellipsis = true;
      55             :     }
      56             :     else
      57             :     {
      58        8124 :         chunk_search_start = s;
      59        8124 :         chunk_copy_start = s;
      60             : 
      61        8124 :         ellipsis = false;
      62             :     }
      63             : 
      64        8136 :     appendStringInfoCharMacro(str, '\'');
      65             : 
      66        8198 :     while ((chunk_end = strchr(chunk_search_start, '\'')) != NULL)
      67             :     {
      68             :         /* copy including the found delimiting ' */
      69          62 :         appendBinaryStringInfoNT(str,
      70             :                                  chunk_copy_start,
      71          62 :                                  chunk_end - chunk_copy_start + 1);
      72             : 
      73             :         /* in order to double it, include this ' into the next chunk as well */
      74          62 :         chunk_copy_start = chunk_end;
      75          62 :         chunk_search_start = chunk_end + 1;
      76             :     }
      77             : 
      78             :     /* copy the last chunk and terminate */
      79        8136 :     if (ellipsis)
      80          12 :         appendStringInfo(str, "%s...'", chunk_copy_start);
      81             :     else
      82        8124 :         appendStringInfo(str, "%s'", chunk_copy_start);
      83             : 
      84        8136 :     if (copy)
      85          12 :         pfree(copy);
      86        8136 : }