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      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 (at) 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  * 3. 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("$FreeBSD$");
     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 }
     87