1 /* mbschr.c - strchr(3) that handles multibyte characters. */
3 /* Copyright (C) 2002 Free Software Foundation, Inc.
5 This file is part of GNU Bash, the Bourne Again SHell.
7 Bash is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
12 Bash is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with Bash. If not, see <http://www.gnu.org/licenses/>.
32 /* In some locales, the non-first byte of some multibyte characters have
33 the same value as some ascii character. Faced with these strings, a
34 legacy strchr() might return the wrong value. */
37 #if defined (PROTOTYPES)
38 mbschr (const char *s, int c)
48 size_t strlength, mblength;
50 /* The locale encodings with said weird property are BIG5, BIG5-HKSCS,
51 GBK, GB18030, SHIFT_JIS, and JOHAB. They exhibit the problem only
52 when c >= 0x30. We can therefore use the faster bytewise search if
54 if ((unsigned char)c >= '0' && MB_CUR_MAX > 1)
57 memset (&state, '\0', sizeof(mbstate_t));
58 strlength = strlen (s);
62 mblength = mbrlen (pos, strlength, &state);
63 if (mblength == (size_t)-2 || mblength == (size_t)-1 || mblength == (size_t)0)
66 if (mblength == 1 && c == (unsigned char)*pos)
69 strlength -= mblength;
73 return ((char *)NULL);
77 return (strchr (s, c));