87 lines
2.0 KiB
C
87 lines
2.0 KiB
C
/*-------------------------------------------------------------------------
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*
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* stringinfo_mb.c
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* Multibyte encoding-aware additional StringInfo facilities
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*
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* This is separate from common/stringinfo.c so that frontend users
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* of that file need not pull in unnecessary multibyte-encoding support
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* code.
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*
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*
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* Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/backend/utils/mb/stringinfo_mb.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "mb/pg_wchar.h"
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#include "mb/stringinfo_mb.h"
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/*
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* appendStringInfoStringQuoted
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*
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* Append up to maxlen bytes from s to str, or the whole input string if
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* maxlen < 0, adding single quotes around it and doubling all single quotes.
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* Add an ellipsis if the copy is incomplete.
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*/
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void
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appendStringInfoStringQuoted(StringInfo str, const char *s, int maxlen)
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{
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char *copy = NULL;
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const char *chunk_search_start,
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*chunk_copy_start,
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*chunk_end;
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int slen;
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bool ellipsis;
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Assert(str != NULL);
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slen = strlen(s);
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if (maxlen >= 0 && maxlen < slen)
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{
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int finallen = pg_mbcliplen(s, slen, maxlen);
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copy = pnstrdup(s, finallen);
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chunk_search_start = copy;
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chunk_copy_start = copy;
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ellipsis = true;
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}
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else
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{
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chunk_search_start = s;
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chunk_copy_start = s;
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ellipsis = false;
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}
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appendStringInfoCharMacro(str, '\'');
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while ((chunk_end = strchr(chunk_search_start, '\'')) != NULL)
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{
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/* copy including the found delimiting ' */
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appendBinaryStringInfoNT(str,
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chunk_copy_start,
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chunk_end - chunk_copy_start + 1);
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/* in order to double it, include this ' into the next chunk as well */
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chunk_copy_start = chunk_end;
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chunk_search_start = chunk_end + 1;
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}
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/* copy the last chunk and terminate */
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if (ellipsis)
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appendStringInfo(str, "%s...'", chunk_copy_start);
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else
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appendStringInfo(str, "%s'", chunk_copy_start);
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if (copy)
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pfree(copy);
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}
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