/*

 * 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 2004 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*	Copyright (c) 1988 AT&T	*/

/*	  All Rights Reserved  	*/

#include "synonyms.h"

#include <string.h>

#include <stddef.h>

#include <sys/types.h>

/*

 * strstr() locates the first occurrence in the string as1 of

 * the sequence of characters (excluding the terminating null

 * character) in the string as2. strstr() returns a pointer

 * to the located string, or a null pointer if the string is

 * not found. If as2 is "", the function returns as1.

 */

char *

strstr(const char *as1, const char *as2)

{

	const char *s1, *s2;

	const char *tptr;

	char c;

	s1 = as1;

	s2 = as2;

	if (s2 == NULL || *s2 == '\0')

		return ((char *)s1);

	c = *s2;

	while (*s1)

		if (*s1++ == c) {

			tptr = s1;

			while ((c = *++s2) == *s1++ && c)

				;

			if (c == 0)

				return ((char *)tptr - 1);

			s1 = tptr;

			s2 = as2;

			c = *s2;

		}

	return (NULL);

}