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wcstok.c revision 1.1 
      1 /* $NetBSD: wcstok.c,v 1.1 2003/03/05 20:18:17 tshiozak 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 (at) 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 
     41 #include <sys/cdefs.h>
     42 #if defined(LIBC_SCCS) && !defined(lint)
     43 __RCSID("$NetBSD: wcstok.c,v 1.1 2003/03/05 20:18:17 tshiozak Exp $");
     44 #endif
     45 
     46 #include <assert.h>
     47 #include <wchar.h>
     48 
     49 wchar_t *
     50 wcstok(s, delim, last)
     51 	wchar_t * __restrict s;
     52 	const wchar_t * __restrict delim;
     53 	wchar_t ** __restrict last;
     54 {
     55 	const wchar_t *spanp;
     56 	wchar_t c, sc;
     57 	wchar_t *tok;
     58 
     59 	/* s may be NULL */
     60 	_DIAGASSERT(delin != NULL);
     61 	_DIAGASSERT(last != NULL);
     62 
     63 	if (s == NULL && (s = *last) == NULL)
     64 		return (NULL);
     65 
     66 	/*
     67 	 * Skip (span) leading delimiters (s += wcsspn(s, delim), sort of).
     68 	 */
     69 cont:
     70 	c = *s++;
     71 	for (spanp = delim; (sc = *spanp++) != L'\0';) {
     72 		if (c == sc)
     73 			goto cont;
     74 	}
     75 
     76 	if (c == L'\0') {	/* no non-delimiter characters */
     77 		*last = NULL;
     78 		return (NULL);
     79 	}
     80 	tok = s - 1;
     81 
     82 	/*
     83 	 * Scan token (scan for delimiters: s += wcscspn(s, delim), sort of).
     84 	 * Note that delim must have one NUL; we stop if we see that, too.
     85 	 */
     86 	for (;;) {
     87 		c = *s++;
     88 		spanp = delim;
     89 		do {
     90 			if ((sc = *spanp++) == c) {
     91 				if (c == L'\0')
     92 					s = NULL;
     93 				else
     94 					s[-1] = L'\0';
     95 				*last = s;
     96 				return (tok);
     97 			}
     98 		} while (sc != L'\0');
     99 	}
    100 	/* NOTREACHED */
    101 }
    102