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 <wchar.h>
38
39 wchar_t *
wcstok(wchar_t * __restrict s,const wchar_t * __restrict delim,wchar_t ** __restrict last)40 wcstok(wchar_t * __restrict s, const wchar_t * __restrict delim,
41 wchar_t ** __restrict last)
42 {
43 const wchar_t *spanp;
44 wchar_t *tok;
45 wchar_t c, sc;
46
47 if (s == NULL && (s = *last) == NULL)
48 return (NULL);
49
50 /*
51 * Skip (span) leading delimiters (s += wcsspn(s, delim), sort of).
52 */
53 cont:
54 c = *s++;
55 for (spanp = delim; (sc = *spanp++) != L'\0';) {
56 if (c == sc)
57 goto cont;
58 }
59
60 if (c == L'\0') { /* no non-delimiter characters */
61 *last = NULL;
62 return (NULL);
63 }
64 tok = s - 1;
65
66 /*
67 * Scan token (scan for delimiters: s += wcscspn(s, delim), sort of).
68 * Note that delim must have one NUL; we stop if we see that, too.
69 */
70 for (;;) {
71 c = *s++;
72 spanp = delim;
73 do {
74 if ((sc = *spanp++) == c) {
75 if (c == L'\0')
76 s = NULL;
77 else
78 s[-1] = L'\0';
79 *last = s;
80 return (tok);
81 }
82 } while (sc != L'\0');
83 }
84 /* NOTREACHED */
85 }
86