xref: /illumos-gate/usr/src/boot/libsa/string/strstr.c (revision 22028508)
1199767f8SToomas Soome /*-
2199767f8SToomas Soome  * Copyright (c) 1990, 1993
3199767f8SToomas Soome  *	The Regents of the University of California.  All rights reserved.
4199767f8SToomas Soome  *
5199767f8SToomas Soome  * This code is derived from software contributed to Berkeley by
6199767f8SToomas Soome  * Chris Torek.
7199767f8SToomas Soome  *
8199767f8SToomas Soome  * Redistribution and use in source and binary forms, with or without
9199767f8SToomas Soome  * modification, are permitted provided that the following conditions
10199767f8SToomas Soome  * are met:
11199767f8SToomas Soome  * 1. Redistributions of source code must retain the above copyright
12199767f8SToomas Soome  *    notice, this list of conditions and the following disclaimer.
13199767f8SToomas Soome  * 2. Redistributions in binary form must reproduce the above copyright
14199767f8SToomas Soome  *    notice, this list of conditions and the following disclaimer in the
15199767f8SToomas Soome  *    documentation and/or other materials provided with the distribution.
16199767f8SToomas Soome  * 3. Neither the name of the University nor the names of its contributors
17199767f8SToomas Soome  *    may be used to endorse or promote products derived from this software
18199767f8SToomas Soome  *    without specific prior written permission.
19199767f8SToomas Soome  *
20199767f8SToomas Soome  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21199767f8SToomas Soome  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22199767f8SToomas Soome  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23199767f8SToomas Soome  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24199767f8SToomas Soome  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25199767f8SToomas Soome  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26199767f8SToomas Soome  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27199767f8SToomas Soome  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28199767f8SToomas Soome  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29199767f8SToomas Soome  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30199767f8SToomas Soome  * SUCH DAMAGE.
31199767f8SToomas Soome  */
32199767f8SToomas Soome 
33199767f8SToomas Soome #if defined(LIBC_SCCS) && !defined(lint)
34199767f8SToomas Soome static char sccsid[] = "@(#)strstr.c	8.1 (Berkeley) 6/4/93";
35199767f8SToomas Soome #endif /* LIBC_SCCS and not lint */
36199767f8SToomas Soome #include <sys/cdefs.h>
37199767f8SToomas Soome __FBSDID("$FreeBSD$");
38199767f8SToomas Soome 
39199767f8SToomas Soome #include <string.h>
40199767f8SToomas Soome 
41199767f8SToomas Soome /*
42199767f8SToomas Soome  * Find the first occurrence of find in s.
43199767f8SToomas Soome  */
44199767f8SToomas Soome char *
strstr(const char * s,const char * find)45199767f8SToomas Soome strstr(const char *s, const char *find)
46199767f8SToomas Soome {
47199767f8SToomas Soome 	char c, sc;
48199767f8SToomas Soome 	size_t len;
49199767f8SToomas Soome 
50199767f8SToomas Soome 	if ((c = *find++) != '\0') {
51199767f8SToomas Soome 		len = strlen(find);
52199767f8SToomas Soome 		do {
53199767f8SToomas Soome 			do {
54199767f8SToomas Soome 				if ((sc = *s++) == '\0')
55199767f8SToomas Soome 					return (NULL);
56199767f8SToomas Soome 			} while (sc != c);
57199767f8SToomas Soome 		} while (strncmp(s, find, len) != 0);
58199767f8SToomas Soome 		s--;
59199767f8SToomas Soome 	}
60199767f8SToomas Soome 	return ((char *)s);
61199767f8SToomas Soome }
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