78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
/* mbschr.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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#ifdef HAVE_STDLIB_H
|
|
# include <stdlib.h>
|
|
#endif
|
|
|
|
#include "bashansi.h"
|
|
#include "shmbutil.h"
|
|
|
|
#undef mbschr
|
|
|
|
/* 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)
|
|
mbschr (const char *s, int c)
|
|
#else
|
|
mbschr (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 (mblength == 1 && c == (unsigned char)*pos)
|
|
return pos;
|
|
|
|
strlength -= mblength;
|
|
pos += mblength;
|
|
}
|
|
|
|
return ((char *)NULL);
|
|
}
|
|
else
|
|
#endif
|
|
return (strchr (s, c));
|
|
}
|