/*-

 * Copyright (c) 1998 Softweyr LLC.  All rights reserved.

 *

 * strtok_r, from Berkeley strtok

 * Oct 13, 1998 by Wes Peters <wes@softweyr.com>

 *

 * Copyright (c) 1988, 1993

 *	The 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

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

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

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

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

 * 4. 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 SOFTWEYR LLC, 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 SOFTWEYR LLC, 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 <sys/cdefs.h>

__FBSDID("$FreeBSD: src/lib/libc/string/wcstok.c,v 1.2 2003/03/12 06:41:49 tjr Exp $");

#include <wchar.h>

EXPORT_C wchar_t *

wcstok(wchar_t * __restrict s, const wchar_t * __restrict delim,

    wchar_t ** __restrict last)

{

	const wchar_t *spanp;

	wchar_t *tok;

	wchar_t c, sc;

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

		return (NULL);

	/*

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

	 */

cont:

	c = *s++;

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

		if (c == sc)

			goto cont;

	}

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

		*last = NULL;

		return (NULL);

	}

	tok = s - 1;

	/*

	 * Scan token (scan for delimiters: s += wcscspn(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 == L'\0')

					s = NULL;

				else

					s[-1] = L'\0';

				*last = s;

				return (tok);

			}

		} while (sc != L'\0');

	}

	/* NOTREACHED */

}