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 #if defined(LIBC_SCCS) && !defined(lint) 31 static char *rcsid = "$OpenBSD: strtok.c,v 1.5 2003/06/11 21:08:16 deraadt Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <string.h> 35 36 char * 37 strtok(char *s, const char *delim) 38 { 39 static char *last; 40 41 return strtok_r(s, delim, &last); 42 } 43 44 char * 45 strtok_r(char *s, const char *delim, char **last) 46 { 47 char *spanp; 48 int c, sc; 49 char *tok; 50 51 52 if (s == NULL && (s = *last) == NULL) 53 return (NULL); 54 55 /* 56 * Skip (span) leading delimiters (s += strspn(s, delim), sort of). 57 */ 58 cont: 59 c = *s++; 60 for (spanp = (char *)delim; (sc = *spanp++) != 0;) { 61 if (c == sc) 62 goto cont; 63 } 64 65 if (c == 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 += strcspn(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 = (char *)delim; 78 do { 79 if ((sc = *spanp++) == c) { 80 if (c == 0) 81 s = NULL; 82 else 83 s[-1] = 0; 84 *last = s; 85 return (tok); 86 } 87 } while (sc != 0); 88 } 89 /* NOTREACHED */ 90 } 91