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