1/* Searching a string for the last occurrence of a character.
2   Copyright (C) 2007-2012 Free Software Foundation, Inc.
3   Written by Bruno Haible <bruno@clisp.org>, 2007.
4
5   This program is free software: you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   the Free Software Foundation; either version 3 of the License, or
8   (at your option) any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   GNU General Public License for more details.
14
15   You should have received a copy of the GNU General Public License
16   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
17
18#include <config.h>
19
20/* Specification.  */
21#include <string.h>
22
23#include "mbuiter.h"
24
25/* Locate the last single-byte character C in the character string STRING,
26   and return a pointer to it.  Return NULL if C is not found in STRING.  */
27char *
28mbsrchr (const char *string, int c)
29{
30  if (MB_CUR_MAX > 1
31      /* Optimization: We know that ASCII characters < 0x30 don't occur as
32         part of multibyte characters longer than 1 byte.  Hence, if c < 0x30,
33         the faster unibyte loop can be used.  */
34      && (unsigned char) c >= 0x30)
35    {
36      const char *result = NULL;
37      mbui_iterator_t iter;
38
39      for (mbui_init (iter, string); mbui_avail (iter); mbui_advance (iter))
40        {
41          if (mb_len (mbui_cur (iter)) == 1
42              && (unsigned char) * mbui_cur_ptr (iter) == (unsigned char) c)
43            result = mbui_cur_ptr (iter);
44        }
45      return (char *) result;
46    }
47  else
48    return strrchr (string, c);
49}
50