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/* xstrchr.c - strchr(3) that handles multibyte characters. */
/* Copyright (C) 2002 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
Bash is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with Bash; see the file COPYING. If not, write to the Free Software
Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#include <config.h>
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif
#include "bashansi.h"
#include "shmbutil.h"
#undef xstrchr
/* In some locales, the non-first byte of some multibyte characters have
the same value as some ascii character. Faced with these strings, a
legacy strchr() might return the wrong value. */
char *
#if defined (PROTOTYPES)
xstrchr (const char *s, int c)
#else
xstrchr (s, c)
const char *s;
int c;
#endif
{
#if HANDLE_MULTIBYTE
char *pos;
mbstate_t state;
size_t strlength, mblength;
/* The locale encodings with said weird property are BIG5, BIG5-HKSCS,
GBK, GB18030, SHIFT_JIS, and JOHAB. They exhibit the problem only
when c >= 0x30. We can therefore use the faster bytewise search if
c <= 0x30. */
if ((unsigned char)c >= '0' && MB_CUR_MAX > 1)
{
pos = (char *)s;
memset (&state, '\0', sizeof(mbstate_t));
strlength = strlen (s);
while (strlength > 0)
{
mblength = mbrlen (pos, strlength, &state);
if (mblength == (size_t)-2 || mblength == (size_t)-1 || mblength == (size_t)0)
mblength = 1;
if (c == (unsigned char)*pos)
return pos;
strlength -= mblength;
pos += mblength;
}
return ((char *)NULL);
}
else
#endif
return (strchr (s, c));
}
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