| /* Searching a string for a character. |
| Copyright (C) 2007-2012 Free Software Foundation, Inc. |
| Written by Bruno Haible <bruno@clisp.org>, 2007. |
| |
| This program 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. |
| |
| This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include <config.h> |
| |
| /* Specification. */ |
| #include <string.h> |
| |
| #include "mbuiter.h" |
| |
| /* Locate the first single-byte character C in the character string STRING, |
| and return a pointer to it. Return NULL if C is not found in STRING. */ |
| char * |
| mbschr (const char *string, int c) |
| { |
| if (MB_CUR_MAX > 1 |
| /* Optimization: We know that ASCII characters < 0x30 don't occur as |
| part of multibyte characters longer than 1 byte. Hence, if c < 0x30, |
| the faster unibyte loop can be used. */ |
| && (unsigned char) c >= 0x30) |
| { |
| mbui_iterator_t iter; |
| |
| for (mbui_init (iter, string);; mbui_advance (iter)) |
| { |
| if (!mbui_avail (iter)) |
| goto notfound; |
| if (mb_len (mbui_cur (iter)) == 1 |
| && (unsigned char) * mbui_cur_ptr (iter) == (unsigned char) c) |
| break; |
| } |
| return (char *) mbui_cur_ptr (iter); |
| notfound: |
| return NULL; |
| } |
| else |
| return strchr (string, c); |
| } |