1 /* $NetBSD: wcstok.c,v 1.4 2012/06/25 22:32:46 abs Exp $ */
2
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. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by Softweyr LLC, the
23 * University of California, Berkeley, and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS
29 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
31 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SOFTWEYR LLC, THE
32 * REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
34 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
35 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
36 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
37 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
38 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Original version ID:
41 * FreeBSD: src/lib/libc/string/wcstok.c,v 1.1 2002/09/07 08:16:57 tjr Exp
42 */
43
44 #include <sys/cdefs.h>
45 #if defined(LIBC_SCCS) && !defined(lint)
46 __RCSID("$NetBSD: wcstok.c,v 1.4 2012/06/25 22:32:46 abs Exp $");
47 #endif
48
49 #include <assert.h>
50 #include <wchar.h>
51
52 wchar_t *
wcstok(wchar_t * __restrict s,const wchar_t * __restrict delim,wchar_t ** __restrict last)53 wcstok(wchar_t * __restrict s, const wchar_t * __restrict delim,
54 wchar_t ** __restrict last)
55 {
56 const wchar_t *spanp;
57 wchar_t c, sc;
58 wchar_t *tok;
59
60 /* s may be NULL */
61 _DIAGASSERT(delim != NULL);
62 _DIAGASSERT(last != NULL);
63
64 if (s == NULL && (s = *last) == NULL)
65 return (NULL);
66
67 /*
68 * Skip (span) leading delimiters (s += wcsspn(s, delim), sort of).
69 */
70 cont:
71 c = *s++;
72 for (spanp = delim; (sc = *spanp++) != L'\0';) {
73 if (c == sc)
74 goto cont;
75 }
76
77 if (c == L'\0') { /* no non-delimiter characters */
78 *last = NULL;
79 return (NULL);
80 }
81 tok = s - 1;
82
83 /*
84 * Scan token (scan for delimiters: s += wcscspn(s, delim), sort of).
85 * Note that delim must have one NUL; we stop if we see that, too.
86 */
87 for (;;) {
88 c = *s++;
89 spanp = delim;
90 do {
91 if ((sc = *spanp++) == c) {
92 if (c == L'\0')
93 s = NULL;
94 else
95 s[-1] = L'\0';
96 *last = s;
97 return (tok);
98 }
99 } while (sc != L'\0');
100 }
101 /* NOTREACHED */
102 }
103