/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1988 AT&T */
/*        All Rights Reserved   */

#include <sys/types.h>

/*
 *      If `s2' is a substring of `s1' return the offset of the first
 *      occurrence of `s2' in `s1',
 *      else return -1.
 */

int
strfind(const char *as1, const char *as2)
{
        const char      *s1, *s2;
        char            c;
        ptrdiff_t       offset;

        s1 = as1;
        s2 = as2;
        c = *s2;

        while (*s1)
                if (*s1++ == c) {
                        offset = s1 - as1 - 1;
                        s2++;
                        while ((c = *s2++) == *s1++ && c)
                                ;
                        if (c == 0)
                                return ((int)offset);
                        s1 = offset + as1 + 1;
                        s2 = as2;
                        c = *s2;
                }
        return (-1);
}