1 /* $OpenBSD: memrchr.c,v 1.2 2007/11/27 16:22:12 martynas Exp $ */ 2 3 /* 4 * Copyright (c) 2007 Todd C. Miller <Todd.Miller@courtesan.com> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 * 18 * $FreeBSD: head/lib/libc/string/memrchr.c 178051 2008-04-10 00:12:44Z delphij $ 19 */ 20 21 #include <string.h> 22 23 /* 24 * Reverse memchr() 25 * Find the last occurrence of 'c' in the buffer 's' of size 'n'. 26 */ 27 void * 28 memrchr(const void *s, int c, size_t n) 29 { 30 const unsigned char *cp; 31 32 if (n != 0) { 33 cp = (unsigned char *)s + n; 34 do { 35 if (*(--cp) == (unsigned char)c) 36 return((void *)cp); 37 } while (--n != 0); 38 } 39 return(NULL); 40 } 41