[apple/libc.git] / string / FreeBSD / wcstok.c

/*-
 * 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 1.3 2007/12/12 18:33:06 wes Exp $");

#include <wchar.h>

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 */
}
Commit	Line	Data
9385eb3d	1	/*-
5b2abdfb A	2	* Copyright (c) 1998 Softweyr LLC. All rights reserved.
	3	*
	4	* strtok_r, from Berkeley strtok
	5	* Oct 13, 1998 by Wes Peters <wes@softweyr.com>
	6	*
	7	* Copyright (c) 1988, 1993
	8	* The Regents of the University of California. All rights reserved.
	9	*
	10	* Redistribution and use in source and binary forms, with or without
	11	* modification, are permitted provided that the following conditions
	12	* are met:
5b2abdfb A	13	* 1. Redistributions of source code must retain the above copyright
5b2abdfb A	14	* notices, this list of conditions and the following disclaimer.
5b2abdfb A	15	* 2. Redistributions in binary form must reproduce the above copyright
	16	* notices, this list of conditions and the following disclaimer in the
	17	* documentation and/or other materials provided with the distribution.
5b2abdfb A	18	* 4. Neither the name of the University nor the names of its contributors
	19	* may be used to endorse or promote products derived from this software
	20	* without specific prior written permission.
	21	*
	22	* THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS
	23	* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	24	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
	25	* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SOFTWEYR LLC, THE
	26	* REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	27	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
	28	* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	29	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	30	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	31	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	32	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	33	*/
	34
9385eb3d	35	#include <sys/cdefs.h>
1f2f436a	36	__FBSDID("$FreeBSD: src/lib/libc/string/wcstok.c,v 1.3 2007/12/12 18:33:06 wes Exp $");
5b2abdfb	37
9385eb3d	38	#include <wchar.h>
5b2abdfb	39
9385eb3d A	40	wchar_t *
	41	wcstok(wchar_t * __restrict s, const wchar_t * __restrict delim,
	42	wchar_t ** __restrict last)
5b2abdfb	43	{
9385eb3d A	44	const wchar_t *spanp;
	45	wchar_t *tok;
	46	wchar_t c, sc;
5b2abdfb	47
9385eb3d A	48	if (s == NULL && (s = *last) == NULL)
9385eb3d A	49	return (NULL);
5b2abdfb	50
9385eb3d A	51	/*
	52	* Skip (span) leading delimiters (s += wcsspn(s, delim), sort of).
	53	*/
5b2abdfb	54	cont:
5b2abdfb	55	c = *s++;
9385eb3d A	56	for (spanp = delim; (sc = *spanp++) != L'\0';) {
	57	if (c == sc)
	58	goto cont;
5b2abdfb	59	}
5b2abdfb	60
9385eb3d A	61	if (c == L'\0') { /* no non-delimiter characters */
	62	*last = NULL;
	63	return (NULL);
5b2abdfb	64	}
9385eb3d A	65	tok = s - 1;
	66
	67	/*
	68	* Scan token (scan for delimiters: s += wcscspn(s, delim), sort of).
	69	* Note that delim must have one NUL; we stop if we see that, too.
	70	*/
	71	for (;;) {
	72	c = *s++;
	73	spanp = delim;
	74	do {
	75	if ((sc = *spanp++) == c) {
	76	if (c == L'\0')
	77	s = NULL;
	78	else
	79	s[-1] = L'\0';
	80	*last = s;
	81	return (tok);
	82	}
	83	} while (sc != L'\0');
	84	}
	85	/* NOTREACHED */
5b2abdfb	86	}