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. 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 * $FreeBSD: head/lib/libc/string/wcstok.c 251069 2013-05-28 20:57:40Z emaste $ 35 */ 36 37 #include <wchar.h> 38 39 wchar_t * 40 wcstok(wchar_t * __restrict s, const wchar_t * __restrict delim, 41 wchar_t ** __restrict last) 42 { 43 const wchar_t *spanp; 44 wchar_t *tok; 45 wchar_t c, sc; 46 47 if (s == NULL && (s = *last) == NULL) 48 return (NULL); 49 50 /* 51 * Skip (span) leading delimiters (s += wcsspn(s, delim), sort of). 52 */ 53 cont: 54 c = *s++; 55 for (spanp = delim; (sc = *spanp++) != L'\0';) { 56 if (c == sc) 57 goto cont; 58 } 59 60 if (c == L'\0') { /* no non-delimiter characters */ 61 *last = NULL; 62 return (NULL); 63 } 64 tok = s - 1; 65 66 /* 67 * Scan token (scan for delimiters: s += wcscspn(s, delim), sort of). 68 * Note that delim must have one NUL; we stop if we see that, too. 69 */ 70 for (;;) { 71 c = *s++; 72 spanp = delim; 73 do { 74 if ((sc = *spanp++) == c) { 75 if (c == L'\0') 76 s = NULL; 77 else 78 s[-1] = L'\0'; 79 *last = s; 80 return (tok); 81 } 82 } while (sc != L'\0'); 83 } 84 /* NOTREACHED */ 85 } 86