xref: /titanic_51/usr/src/lib/libmail/common/substr.c (revision dd51520e127b452179a2ce4ea3bd8dee949f9afe)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28 /*	  All Rights Reserved  	*/
29 
30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
31 
32 #include <sys/types.h>
33 #include "libmail.h"
34 
35 /*
36  *	This routine looks for string2 in string1.
37  *	If found, it returns the position string2 is found at,
38  *	otherwise it returns a -1.
39  */
40 int
41 substr(char *string1, char *string2)
42 {
43 	int i, j, len1, len2;
44 
45 	/* the size of the substring will always fit into an int */
46 	/*LINTED*/
47 	len1 = (int)strlen(string1);
48 	/*LINTED*/
49 	len2 = (int)strlen(string2);
50 	for (i = 0; i < len1 - len2 + 1; i++) {
51 		for (j = 0; j < len2 && string1[i+j] == string2[j]; j++)
52 			continue;
53 		if (j == len2)
54 			return (i);
55 	}
56 	return (-1);
57 }
58