1 /*
2 * SPDX-License-Identifier: ISC
3 *
4 * Copyright (c) 2007, 2010-2014
5 * Todd C. Miller <Todd.Miller@sudo.ws>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 /*
21 * This is an open source non-commercial project. Dear PVS-Studio, please check it.
22 * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
23 */
24
25 #include <config.h>
26
27 #ifndef HAVE_MEMRCHR
28
29 #include <sys/types.h>
30
31 #include "sudo_compat.h"
32
33 /*
34 * Reverse memchr()
35 * Find the last occurrence of 'c' in the buffer 's' of size 'n'.
36 */
37 void *
sudo_memrchr(const void * s,int c,size_t n)38 sudo_memrchr(const void *s, int c, size_t n)
39 {
40 const unsigned char *cp;
41
42 if (n != 0) {
43 cp = (unsigned char *)s + n;
44 do {
45 if (*(--cp) == (unsigned char)c)
46 return (void *)cp;
47 } while (--n != 0);
48 }
49 return (void *)0;
50 }
51 #endif /* HAVE_MEMRCHR */
52