1 /*
2 ** Copyright 2001, Travis Geiselbrecht. All rights reserved.
3 ** Distributed under the terms of the NewOS License.
4 */
5 /*
6 * Copyright (c) 2008 Travis Geiselbrecht
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining
9 * a copy of this software and associated documentation files
10 * (the "Software"), to deal in the Software without restriction,
11 * including without limitation the rights to use, copy, modify, merge,
12 * publish, distribute, sublicense, and/or sell copies of the Software,
13 * and to permit persons to whom the Software is furnished to do so,
14 * subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be
17 * included in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
22 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
23 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 */
27 #include <string.h>
28 #include <sys/types.h>
29
30 char *
strstr(char const * s1,char const * s2)31 strstr(char const *s1, char const *s2)
32 {
33 int l1, l2;
34
35 l2 = strlen(s2);
36 if (!l2)
37 return (char *)s1;
38 l1 = strlen(s1);
39 while (l1 >= l2) {
40 l1--;
41 if (!memcmp(s1,s2,l2))
42 return (char *)s1;
43 s1++;
44 }
45 return NULL;
46 }
47