xref: /illumos-gate/usr/src/lib/libmail/common/substr.c (revision e8031f0a8ed0e45c6d8847c5e09424e66fd34a4b)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"
/*LINTLIBRARY*/

#include "c_synonyms.h"
#include <sys/types.h>
#include "libmail.h"

/*
 *	This routine looks for string2 in string1.
 *	If found, it returns the position string2 is found at,
 *	otherwise it returns a -1.
 */
int
substr(char *string1, char *string2)
{
	int i, j, len1, len2;

	/* the size of the substring will always fit into an int */
	/*LINTED*/
	len1 = (int)strlen(string1);
	/*LINTED*/
	len2 = (int)strlen(string2);
	for (i = 0; i < len1 - len2 + 1; i++) {
		for (j = 0; j < len2 && string1[i+j] == string2[j]; j++);
		if (j == len2)
			return (i);
	}
	return (-1);
}