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/*-------------------------------------------------------------------------
*
* stringinfo_mb.c
* Multibyte encoding-aware additional StringInfo facilities
*
* This is separate from common/stringinfo.c so that frontend users
* of that file need not pull in unnecessary multibyte-encoding support
* code.
*
*
* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/utils/mb/stringinfo_mb.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "mb/stringinfo_mb.h"
#include "mb/pg_wchar.h"
/*
* appendStringInfoStringQuoted
*
* Append up to maxlen bytes from s to str, or the whole input string if
* maxlen < 0, adding single quotes around it and doubling all single quotes.
* Add an ellipsis if the copy is incomplete.
*/
void
appendStringInfoStringQuoted(StringInfo str, const char *s, int maxlen)
{
char *copy = NULL;
const char *chunk_search_start,
*chunk_copy_start,
*chunk_end;
int slen;
bool ellipsis;
Assert(str != NULL);
slen = strlen(s);
if (maxlen >= 0 && maxlen < slen)
{
int finallen = pg_mbcliplen(s, slen, maxlen);
copy = pnstrdup(s, finallen);
chunk_search_start = copy;
chunk_copy_start = copy;
ellipsis = true;
}
else
{
chunk_search_start = s;
chunk_copy_start = s;
ellipsis = false;
}
appendStringInfoCharMacro(str, '\'');
while ((chunk_end = strchr(chunk_search_start, '\'')) != NULL)
{
/* copy including the found delimiting ' */
appendBinaryStringInfoNT(str,
chunk_copy_start,
chunk_end - chunk_copy_start + 1);
/* in order to double it, include this ' into the next chunk as well */
chunk_copy_start = chunk_end;
chunk_search_start = chunk_end + 1;
}
/* copy the last chunk and terminate */
if (ellipsis)
appendStringInfo(str, "%s...'", chunk_copy_start);
else
appendStringInfo(str, "%s'", chunk_copy_start);
if (copy)
pfree(copy);
}
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