/*	$NetBSD: strtok_r.c,v 1.9 2003/08/07 16:43:53 agc Exp $	*/

/*

 * Copyright (c) 1988 Regents of the University of California.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#include <net-snmp/net-snmp-config.h>

#ifndef WIN32

#include <sys/cdefs.h>

#endif

#include <string.h>

#include <net-snmp/library/system.h>

/*

 * thread-safe version of strtok

 */

char *

strtok_r(char *s, const char *delim, char **lasts)

{

	const char *spanp;

	int c, sc;

	char *tok;

	/* s may be NULL */

	/*netsnmp_assert(delim != NULL);*/

	/*netsnmp_assert(lasts != NULL);*/

	if (s == NULL && (s = *lasts) == NULL)

		return (NULL);

	/*

	 * Skip (span) leading delimiters (s += strspn(s, delim), sort of).

	 */

cont:

	c = *s++;

	for (spanp = delim; (sc = *spanp++) != 0;) {

		if (c == sc)

			goto cont;

	}

	if (c == 0) {		/* no non-delimiter characters */

		*lasts = NULL;

		return (NULL);

	}

	tok = s - 1;

	/*

	 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).

	 * Note that delim must have one NUL; we stop if we see that, too.

	 */

	for (;;) {

		c = *s++;

		spanp = delim;

		do {

			if ((sc = *spanp++) == c) {

				if (c == 0)

					s = NULL;

				else

					s[-1] = 0;

				*lasts = s;

				return (tok);

			}

		} while (sc != 0);

	}

	/* NOTREACHED */

}