1 /* $NetBSD: strstr.c,v 1.1.1.3 2015/01/17 16:34:18 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997-2014 Erez Zadok
5 * Copyright (c) 1990 Jan-Simon Pendry
6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
7 * Copyright (c) 1990 The Regents of the University of California.
8 * All rights reserved.
9 *
10 * This code is derived from the Free Software Foundation, Inc. GNU utilities.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *
37 * File: am-utils/libamu/strstr.c
38 *
39 */
40
41 #ifdef HAVE_CONFIG_H
42 # include <config.h>
43 #endif /* HAVE_CONFIG_H */
44 #include <am_defs.h>
45 #include <amu.h>
46
47
48 /* strstr.c -- return the offset of one string within another
49 Copyright (C) 1989, 1990 Free Software Foundation, Inc.
50
51 This program is free software; you can redistribute it and/or modify
52 it under the terms of the GNU General Public License as published by
53 the Free Software Foundation; either version 2, or (at your option)
54 any later version.
55
56 This program is distributed in the hope that it will be useful,
57 but WITHOUT ANY WARRANTY; without even the implied warranty of
58 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
59 GNU General Public License for more details.
60
61 You should have received a copy of the GNU General Public License
62 along with this program; if not, write to the Free Software
63 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
64
65 /* Author:
66 Mike Rendell Department of Computer Science
67 michael@garfield.mun.edu Memorial University of Newfoundland
68 ..!uunet!garfield!michael St. John's, Nfld., Canada
69 (709) 737-4550 A1C 5S7
70 */
71
72
73 /*
74 * Return the starting address of string S2 in S1;
75 * return 0 if it is not found.
76 */
77 char *
strstr(char * s1,char * s2)78 strstr(char *s1, char *s2)
79 {
80 int i;
81 char *p1;
82 char *p2;
83 char *s = s1;
84
85 for (p2 = s2, i = 0; *s; p2 = s2, i++, s++) {
86 for (p1 = s; *p1 && *p2 && *p1 == *p2; p1++, p2++)
87 ;
88 if (!*p2)
89 break;
90 }
91 if (!*p2)
92 return s1 + i;
93
94 return 0;
95 }
96