1 /* 2 * Copyright (c) 1988 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <string.h> 31 32 static char * 33 __strtok_r (register char *s, 34 register const char *delim, 35 char **lasts, 36 int skip_leading_delim) 37 { 38 register char *spanp; 39 register int c, sc; 40 char *tok; 41 42 43 if (s == NULL && (s = *lasts) == NULL) 44 return (NULL); 45 46 /* 47 * Skip (span) leading delimiters (s += strspn(s, delim), sort of). 48 */ 49 cont: 50 c = *s++; 51 for (spanp = (char *)delim; (sc = *spanp++) != 0;) { 52 if (c == sc) { 53 if (skip_leading_delim) { 54 goto cont; 55 } 56 else { 57 *lasts = s; 58 s[-1] = 0; 59 return (s - 1); 60 } 61 } 62 } 63 64 if (c == 0) { /* no non-delimiter characters */ 65 *lasts = NULL; 66 return (NULL); 67 } 68 tok = s - 1; 69 70 /* 71 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of). 72 * Note that delim must have one NUL; we stop if we see that, too. 73 */ 74 for (;;) { 75 c = *s++; 76 spanp = (char *)delim; 77 do { 78 if ((sc = *spanp++) == c) { 79 if (c == 0) 80 s = NULL; 81 else 82 s[-1] = 0; 83 *lasts = s; 84 return (tok); 85 } 86 } while (sc != 0); 87 } 88 /* NOTREACHED */ 89 } 90 91 char * 92 strtok_r (register char *__restrict s, 93 register const char *__restrict delim, 94 char **__restrict lasts) 95 { 96 return __strtok_r (s, delim, lasts, 1); 97 } 98