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   * 4. 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: src/lib/libc/string/wcstok.c,v 1.3 2007/12/12 18:33:06 wes Exp $");
37  
38  #include <wchar.h>
39  
40  wchar_t *
41  wcstok(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  	 */
54  cont:
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  }