xref: /openbsd/lib/libc/string/wcstok.c (revision 404b540a)
1 /*	$OpenBSD: wcstok.c,v 1.3 2005/08/08 08:05:37 espie Exp $	*/
2 /* $NetBSD: wcstok.c,v 1.3 2003/07/10 08:50:48 tshiozak Exp $ */
3 
4 /*-
5  * Copyright (c) 1998 Softweyr LLC.  All rights reserved.
6  *
7  * strtok_r, from Berkeley strtok
8  * Oct 13, 1998 by Wes Peters <wes@softweyr.com>
9  *
10  * Copyright (c) 1988, 1993
11  *	The Regents of the University of California.  All rights reserved.
12  *
13  * Redistribution and use in source and binary forms, with or without
14  * modification, are permitted provided that the following conditions
15  * are met:
16  * 1. Redistributions of source code must retain the above copyright
17  *    notices, this list of conditions and the following disclaimer.
18  * 2. Redistributions in binary form must reproduce the above copyright
19  *    notices, this list of conditions and the following disclaimer in the
20  *    documentation and/or other materials provided with the distribution.
21  * 3. All advertising materials mentioning features or use of this software
22  *    must display the following acknowledgement:
23  *	This product includes software developed by Softweyr LLC, the
24  *      University of California, Berkeley, and its contributors.
25  * 4. Neither the name of the University nor the names of its contributors
26  *    may be used to endorse or promote products derived from this software
27  *    without specific prior written permission.
28  *
29  * THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS
30  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
32  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL SOFTWEYR LLC, THE
33  * REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
35  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
36  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
37  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
38  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
39  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40  *
41  * Original version ID:
42  * FreeBSD: src/lib/libc/string/wcstok.c,v 1.1 2002/09/07 08:16:57 tjr Exp
43  */
44 
45 #include <wchar.h>
46 
47 wchar_t *
48 wcstok(wchar_t * __restrict s, const wchar_t * __restrict delim,
49     wchar_t ** __restrict last)
50 {
51 	const wchar_t *spanp;
52 	wchar_t c, sc;
53 	wchar_t *tok;
54 
55 	if (s == NULL && (s = *last) == NULL)
56 		return (NULL);
57 
58 	/*
59 	 * Skip (span) leading delimiters (s += wcsspn(s, delim), sort of).
60 	 */
61 cont:
62 	c = *s++;
63 	for (spanp = delim; (sc = *spanp++) != L'\0';) {
64 		if (c == sc)
65 			goto cont;
66 	}
67 
68 	if (c == L'\0') {	/* no non-delimiter characters */
69 		*last = NULL;
70 		return (NULL);
71 	}
72 	tok = s - 1;
73 
74 	/*
75 	 * Scan token (scan for delimiters: s += wcscspn(s, delim), sort of).
76 	 * Note that delim must have one NUL; we stop if we see that, too.
77 	 */
78 	for (;;) {
79 		c = *s++;
80 		spanp = delim;
81 		do {
82 			if ((sc = *spanp++) == c) {
83 				if (c == L'\0')
84 					s = NULL;
85 				else
86 					s[-1] = L'\0';
87 				*last = s;
88 				return (tok);
89 			}
90 		} while (sc != L'\0');
91 	}
92 	/* NOTREACHED */
93 }
94