1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. 24 */ 25 26 /* 27 * Copyright (c) 2005 Pascal Gloor <pascal.gloor@spale.com> 28 * 29 * Redistribution and use in source and binary forms, with or without 30 * modification, are permitted provided that the following conditions 31 * are met: 32 * 1. Redistributions of source code must retain the above copyright 33 * notice, this list of conditions and the following disclaimer. 34 * 2. Redistributions in binary form must reproduce the above copyright 35 * notice, this list of conditions and the following disclaimer in the 36 * documentation and/or other materials provided with the distribution. 37 * 3. The name of the author may not be used to endorse or promote 38 * products derived from this software without specific prior written 39 * permission. 40 * 41 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 */ 53 54 #include <string.h> 55 56 /* 57 * Find the first occurrence of the byte string s in byte string l. 58 */ 59 60 void * 61 memmem(const void *l, size_t l_len, const void *s, size_t s_len) 62 { 63 char *cur, *last; 64 const char *cl = (const char *)l; 65 const char *cs = (const char *)s; 66 67 /* we need something to compare */ 68 if (l_len == 0 || s_len == 0) 69 return (NULL); 70 71 /* "s" must be smaller or equal to "l" */ 72 if (l_len < s_len) 73 return (NULL); 74 75 /* special case where s_len == 1 */ 76 if (s_len == 1) 77 return (memchr(l, (int)*cs, l_len)); 78 79 /* the last position where its possible to find "s" in "l" */ 80 last = (char *)cl + l_len - s_len; 81 82 for (cur = (char *)cl; cur <= last; cur++) 83 if (cur[0] == cs[0] && memcmp(cur, cs, s_len) == 0) 84 return (cur); 85 86 return (NULL); 87 } 88