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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by Softweyr LLC, the 21 * University of California, Berkeley, and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 28 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 29 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SOFTWEYR LLC, THE 30 * REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 31 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 32 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 33 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 34 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 35 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 36 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include <wchar.h> 43 44 wchar_t * 45 wcstok(wchar_t * __restrict s, const wchar_t * __restrict delim, 46 wchar_t ** __restrict last) 47 { 48 const wchar_t *spanp; 49 wchar_t *tok; 50 wchar_t c, sc; 51 52 if (s == NULL && (s = *last) == NULL) 53 return (NULL); 54 55 /* 56 * Skip (span) leading delimiters (s += wcsspn(s, delim), sort of). 57 */ 58 cont: 59 c = *s++; 60 for (spanp = delim; (sc = *spanp++) != L'\0';) { 61 if (c == sc) 62 goto cont; 63 } 64 65 if (c == L'\0') { /* no non-delimiter characters */ 66 *last = NULL; 67 return (NULL); 68 } 69 tok = s - 1; 70 71 /* 72 * Scan token (scan for delimiters: s += wcscspn(s, delim), sort of). 73 * Note that delim must have one NUL; we stop if we see that, too. 74 */ 75 for (;;) { 76 c = *s++; 77 spanp = delim; 78 do { 79 if ((sc = *spanp++) == c) { 80 if (c == L'\0') 81 s = NULL; 82 else 83 s[-1] = L'\0'; 84 *last = s; 85 return (tok); 86 } 87 } while (sc != L'\0'); 88 } 89 /* NOTREACHED */ 90 } 91