1*82e45205SXin LI /* $OpenBSD: memrchr.c,v 1.2 2007/11/27 16:22:12 martynas Exp $ */
2*82e45205SXin LI
3*82e45205SXin LI /*
4*82e45205SXin LI * Copyright (c) 2007 Todd C. Miller <Todd.Miller@courtesan.com>
5*82e45205SXin LI *
6*82e45205SXin LI * Permission to use, copy, modify, and distribute this software for any
7*82e45205SXin LI * purpose with or without fee is hereby granted, provided that the above
8*82e45205SXin LI * copyright notice and this permission notice appear in all copies.
9*82e45205SXin LI *
10*82e45205SXin LI * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11*82e45205SXin LI * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12*82e45205SXin LI * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13*82e45205SXin LI * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14*82e45205SXin LI * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15*82e45205SXin LI * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16*82e45205SXin LI * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17*82e45205SXin LI */
18*82e45205SXin LI
19*82e45205SXin LI #include <string.h>
20*82e45205SXin LI
21*82e45205SXin LI /*
22*82e45205SXin LI * Reverse memchr()
23*82e45205SXin LI * Find the last occurrence of 'c' in the buffer 's' of size 'n'.
24*82e45205SXin LI */
25*82e45205SXin LI void *
memrchr(const void * s,int c,size_t n)26*82e45205SXin LI memrchr(const void *s, int c, size_t n)
27*82e45205SXin LI {
28*82e45205SXin LI const unsigned char *cp;
29*82e45205SXin LI
30*82e45205SXin LI if (n != 0) {
31*82e45205SXin LI cp = (unsigned char *)s + n;
32*82e45205SXin LI do {
33*82e45205SXin LI if (*(--cp) == (unsigned char)c)
34*82e45205SXin LI return((void *)cp);
35*82e45205SXin LI } while (--n != 0);
36*82e45205SXin LI }
37*82e45205SXin LI return(NULL);
38*82e45205SXin LI }
39