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