1*13093SRoger.Faulkner@Oracle.COM /*
2*13093SRoger.Faulkner@Oracle.COM * CDDL HEADER START
3*13093SRoger.Faulkner@Oracle.COM *
4*13093SRoger.Faulkner@Oracle.COM * The contents of this file are subject to the terms of the
5*13093SRoger.Faulkner@Oracle.COM * Common Development and Distribution License (the "License").
6*13093SRoger.Faulkner@Oracle.COM * You may not use this file except in compliance with the License.
7*13093SRoger.Faulkner@Oracle.COM *
8*13093SRoger.Faulkner@Oracle.COM * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9*13093SRoger.Faulkner@Oracle.COM * or http://www.opensolaris.org/os/licensing.
10*13093SRoger.Faulkner@Oracle.COM * See the License for the specific language governing permissions
11*13093SRoger.Faulkner@Oracle.COM * and limitations under the License.
12*13093SRoger.Faulkner@Oracle.COM *
13*13093SRoger.Faulkner@Oracle.COM * When distributing Covered Code, include this CDDL HEADER in each
14*13093SRoger.Faulkner@Oracle.COM * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15*13093SRoger.Faulkner@Oracle.COM * If applicable, add the following below this CDDL HEADER, with the
16*13093SRoger.Faulkner@Oracle.COM * fields enclosed by brackets "[]" replaced with your own identifying
17*13093SRoger.Faulkner@Oracle.COM * information: Portions Copyright [yyyy] [name of copyright owner]
18*13093SRoger.Faulkner@Oracle.COM *
19*13093SRoger.Faulkner@Oracle.COM * CDDL HEADER END
20*13093SRoger.Faulkner@Oracle.COM */
21*13093SRoger.Faulkner@Oracle.COM
22*13093SRoger.Faulkner@Oracle.COM /*
23*13093SRoger.Faulkner@Oracle.COM * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
24*13093SRoger.Faulkner@Oracle.COM */
25*13093SRoger.Faulkner@Oracle.COM
26*13093SRoger.Faulkner@Oracle.COM /*
27*13093SRoger.Faulkner@Oracle.COM * Copyright (c) 2005 Pascal Gloor <pascal.gloor@spale.com>
28*13093SRoger.Faulkner@Oracle.COM *
29*13093SRoger.Faulkner@Oracle.COM * Redistribution and use in source and binary forms, with or without
30*13093SRoger.Faulkner@Oracle.COM * modification, are permitted provided that the following conditions
31*13093SRoger.Faulkner@Oracle.COM * are met:
32*13093SRoger.Faulkner@Oracle.COM * 1. Redistributions of source code must retain the above copyright
33*13093SRoger.Faulkner@Oracle.COM * notice, this list of conditions and the following disclaimer.
34*13093SRoger.Faulkner@Oracle.COM * 2. Redistributions in binary form must reproduce the above copyright
35*13093SRoger.Faulkner@Oracle.COM * notice, this list of conditions and the following disclaimer in the
36*13093SRoger.Faulkner@Oracle.COM * documentation and/or other materials provided with the distribution.
37*13093SRoger.Faulkner@Oracle.COM * 3. The name of the author may not be used to endorse or promote
38*13093SRoger.Faulkner@Oracle.COM * products derived from this software without specific prior written
39*13093SRoger.Faulkner@Oracle.COM * permission.
40*13093SRoger.Faulkner@Oracle.COM *
41*13093SRoger.Faulkner@Oracle.COM * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
42*13093SRoger.Faulkner@Oracle.COM * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43*13093SRoger.Faulkner@Oracle.COM * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44*13093SRoger.Faulkner@Oracle.COM * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45*13093SRoger.Faulkner@Oracle.COM * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46*13093SRoger.Faulkner@Oracle.COM * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47*13093SRoger.Faulkner@Oracle.COM * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48*13093SRoger.Faulkner@Oracle.COM * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49*13093SRoger.Faulkner@Oracle.COM * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50*13093SRoger.Faulkner@Oracle.COM * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51*13093SRoger.Faulkner@Oracle.COM * SUCH DAMAGE.
52*13093SRoger.Faulkner@Oracle.COM */
53*13093SRoger.Faulkner@Oracle.COM
54*13093SRoger.Faulkner@Oracle.COM #include <string.h>
55*13093SRoger.Faulkner@Oracle.COM
56*13093SRoger.Faulkner@Oracle.COM /*
57*13093SRoger.Faulkner@Oracle.COM * Find the first occurrence of the byte string s in byte string l.
58*13093SRoger.Faulkner@Oracle.COM */
59*13093SRoger.Faulkner@Oracle.COM
60*13093SRoger.Faulkner@Oracle.COM void *
memmem(const void * l,size_t l_len,const void * s,size_t s_len)61*13093SRoger.Faulkner@Oracle.COM memmem(const void *l, size_t l_len, const void *s, size_t s_len)
62*13093SRoger.Faulkner@Oracle.COM {
63*13093SRoger.Faulkner@Oracle.COM char *cur, *last;
64*13093SRoger.Faulkner@Oracle.COM const char *cl = (const char *)l;
65*13093SRoger.Faulkner@Oracle.COM const char *cs = (const char *)s;
66*13093SRoger.Faulkner@Oracle.COM
67*13093SRoger.Faulkner@Oracle.COM /* we need something to compare */
68*13093SRoger.Faulkner@Oracle.COM if (l_len == 0 || s_len == 0)
69*13093SRoger.Faulkner@Oracle.COM return (NULL);
70*13093SRoger.Faulkner@Oracle.COM
71*13093SRoger.Faulkner@Oracle.COM /* "s" must be smaller or equal to "l" */
72*13093SRoger.Faulkner@Oracle.COM if (l_len < s_len)
73*13093SRoger.Faulkner@Oracle.COM return (NULL);
74*13093SRoger.Faulkner@Oracle.COM
75*13093SRoger.Faulkner@Oracle.COM /* special case where s_len == 1 */
76*13093SRoger.Faulkner@Oracle.COM if (s_len == 1)
77*13093SRoger.Faulkner@Oracle.COM return (memchr(l, (int)*cs, l_len));
78*13093SRoger.Faulkner@Oracle.COM
79*13093SRoger.Faulkner@Oracle.COM /* the last position where its possible to find "s" in "l" */
80*13093SRoger.Faulkner@Oracle.COM last = (char *)cl + l_len - s_len;
81*13093SRoger.Faulkner@Oracle.COM
82*13093SRoger.Faulkner@Oracle.COM for (cur = (char *)cl; cur <= last; cur++)
83*13093SRoger.Faulkner@Oracle.COM if (cur[0] == cs[0] && memcmp(cur, cs, s_len) == 0)
84*13093SRoger.Faulkner@Oracle.COM return (cur);
85*13093SRoger.Faulkner@Oracle.COM
86*13093SRoger.Faulkner@Oracle.COM return (NULL);
87*13093SRoger.Faulkner@Oracle.COM }
88