/* 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)); }