1 // Copyright 2016 The Fuchsia Authors
2 // Copyright (c) 2008 Travis Geiselbrecht
3 //
4 // Use of this source code is governed by a MIT-style
5 // license that can be found in the LICENSE file or at
6 // https://opensource.org/licenses/MIT
7 
8 #include <string.h>
9 #include <sys/types.h>
10 
11 char *
strstr(char const * s1,char const * s2)12 strstr(char const *s1, char const *s2)
13 {
14     int l1, l2;
15 
16     l2 = strlen(s2);
17     if (!l2)
18         return (char *)s1;
19     l1 = strlen(s1);
20     while (l1 >= l2) {
21         l1--;
22         if (!memcmp(s1,s2,l2))
23             return (char *)s1;
24         s1++;
25     }
26     return NULL;
27 }
28