1/*-
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:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notices, this list of conditions and the following disclaimer.
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.
18 * 3. 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
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD$");
37
38#include <wchar.h>
39
40wchar_t *
41wcstok(wchar_t * __restrict s, const wchar_t * __restrict delim,
42    wchar_t ** __restrict last)
43{
44	const wchar_t *spanp;
45	wchar_t *tok;
46	wchar_t c, sc;
47
48	if (s == NULL && (s = *last) == NULL)
49		return (NULL);
50
51	/*
52	 * Skip (span) leading delimiters (s += wcsspn(s, delim), sort of).
53	 */
54cont:
55	c = *s++;
56	for (spanp = delim; (sc = *spanp++) != L'\0';) {
57		if (c == sc)
58			goto cont;
59	}
60
61	if (c == L'\0') {	/* no non-delimiter characters */
62		*last = NULL;
63		return (NULL);
64	}
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 */
86}
87