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 char * 33 strtok(char *s, const char *delim) 34 { 35 static char *last; 36 37 return strtok_r(s, delim, &last); 38 } 39 DEF_STRONG(strtok); 40 41 char * 42 strtok_r(char *s, const char *delim, char **last) 43 { 44 const char *spanp; 45 int c, sc; 46 char *tok; 47 48 if (s == NULL && (s = *last) == NULL) 49 return (NULL); 50 51 /* 52 * Skip (span) leading delimiters (s += strspn(s, delim), sort of). 53 */ 54 cont: 55 c = *s++; 56 for (spanp = delim; (sc = *spanp++) != 0;) { 57 if (c == sc) 58 goto cont; 59 } 60 61 if (c == 0) { /* no non-delimiter characters */ 62 *last = NULL; 63 return (NULL); 64 } 65 tok = s - 1; 66 67 /* 68 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of). 69 * Note that delim must have one NUL; we stop if we see that, too. 70 */ 71 for (;;) { 72 c = *s++; 73 spanp = delim; 74 do { 75 if ((sc = *spanp++) == c) { 76 if (c == 0) 77 s = NULL; 78 else 79 s[-1] = '\0'; 80 *last = s; 81 return (tok); 82 } 83 } while (sc != 0); 84 } 85 /* NOTREACHED */ 86 } 87 DEF_WEAK(strtok_r); 88