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 * $OpenBSD: memrchr.c,v 1.2 2007/11/27 16:22:12 martynas Exp $ 17 * $FreeBSD: src/lib/libc/string/memrchr.c,v 1.1 2008/04/10 00:12:44 delphij Exp $ 18 */ 19 20 #include <string.h> 21 22 /* 23 * Reverse memchr() 24 * Find the last occurrence of 'c' in the buffer 's' of size 'n'. 25 */ 26 void * 27 memrchr(const void *s, int c, size_t n) 28 { 29 const unsigned char *cp; 30 31 if (n != 0) { 32 cp = (unsigned char *)s + n; 33 do { 34 if (*(--cp) == (unsigned char)c) 35 return((void *)cp); 36 } while (--n != 0); 37 } 38 return(NULL); 39 } 40