wcstok.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1998 Softweyr LLC.  All rights reserved.
5 *
6 * strtok_r, from Berkeley strtok
7 * Oct 13, 1998 by Wes Peters <wes@softweyr.com>
8 *
9 * Copyright (c) 1988, 1993
10 *	The Regents of the University of California.  All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notices, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notices, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS
25 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
27 * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL SOFTWEYR LLC, THE
28 * REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
30 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
31 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: stable/11/lib/libc/string/wcstok.c 330897 2018-03-14 03:19:51Z eadler $");
39
40#include <wchar.h>
41
42wchar_t *
43wcstok(wchar_t * __restrict s, const wchar_t * __restrict delim,
44    wchar_t ** __restrict last)
45{
46	const wchar_t *spanp;
47	wchar_t *tok;
48	wchar_t c, sc;
49
50	if (s == NULL && (s = *last) == NULL)
51		return (NULL);
52
53	/*
54	 * Skip (span) leading delimiters (s += wcsspn(s, delim), sort of).
55	 */
56cont:
57	c = *s++;
58	for (spanp = delim; (sc = *spanp++) != L'\0';) {
59		if (c == sc)
60			goto cont;
61	}
62
63	if (c == L'\0') {	/* no non-delimiter characters */
64		*last = NULL;
65		return (NULL);
66	}
67	tok = s - 1;
68
69	/*
70	 * Scan token (scan for delimiters: s += wcscspn(s, delim), sort of).
71	 * Note that delim must have one NUL; we stop if we see that, too.
72	 */
73	for (;;) {
74		c = *s++;
75		spanp = delim;
76		do {
77			if ((sc = *spanp++) == c) {
78				if (c == L'\0')
79					s = NULL;
80				else
81					s[-1] = L'\0';
82				*last = s;
83				return (tok);
84			}
85		} while (sc != L'\0');
86	}
87	/* NOTREACHED */
88}
89