1 /* $NetBSD: wcstok.c,v 1.3 2003/07/10 08:50:48 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@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 1.3 2003/07/10 08:50:48 tshiozak Exp $"); 47 #endif 48 49 #include <assert.h> 50 #include <wchar.h> 51 52 wchar_t * 53 wcstok(s, delim, last) 54 wchar_t * __restrict s; 55 const wchar_t * __restrict delim; 56 wchar_t ** __restrict last; 57 { 58 const wchar_t *spanp; 59 wchar_t c, sc; 60 wchar_t *tok; 61 62 /* s may be NULL */ 63 _DIAGASSERT(delim != NULL); 64 _DIAGASSERT(last != NULL); 65 66 if (s == NULL && (s = *last) == NULL) 67 return (NULL); 68 69 /* 70 * Skip (span) leading delimiters (s += wcsspn(s, delim), sort of). 71 */ 72 cont: 73 c = *s++; 74 for (spanp = delim; (sc = *spanp++) != L'\0';) { 75 if (c == sc) 76 goto cont; 77 } 78 79 if (c == L'\0') { /* no non-delimiter characters */ 80 *last = NULL; 81 return (NULL); 82 } 83 tok = s - 1; 84 85 /* 86 * Scan token (scan for delimiters: s += wcscspn(s, delim), sort of). 87 * Note that delim must have one NUL; we stop if we see that, too. 88 */ 89 for (;;) { 90 c = *s++; 91 spanp = delim; 92 do { 93 if ((sc = *spanp++) == c) { 94 if (c == L'\0') 95 s = NULL; 96 else 97 s[-1] = L'\0'; 98 *last = s; 99 return (tok); 100 } 101 } while (sc != L'\0'); 102 } 103 /* NOTREACHED */ 104 } 105