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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char *rcsid = "$OpenBSD: strtok.c,v 1.3 1999/11/09 11:19:46 art Exp $"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <string.h> 39 40 char * 41 strtok(s, delim) 42 register char *s; 43 register const char *delim; 44 { 45 static char *last; 46 47 return strtok_r(s, delim, &last); 48 } 49 50 char * 51 strtok_r(s, delim, last) 52 register char *s; 53 register const char *delim; 54 char **last; 55 { 56 register char *spanp; 57 register int c, sc; 58 char *tok; 59 60 61 if (s == NULL && (s = *last) == NULL) 62 return (NULL); 63 64 /* 65 * Skip (span) leading delimiters (s += strspn(s, delim), sort of). 66 */ 67 cont: 68 c = *s++; 69 for (spanp = (char *)delim; (sc = *spanp++) != 0;) { 70 if (c == sc) 71 goto cont; 72 } 73 74 if (c == 0) { /* no non-delimiter characters */ 75 *last = NULL; 76 return (NULL); 77 } 78 tok = s - 1; 79 80 /* 81 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of). 82 * Note that delim must have one NUL; we stop if we see that, too. 83 */ 84 for (;;) { 85 c = *s++; 86 spanp = (char *)delim; 87 do { 88 if ((sc = *spanp++) == c) { 89 if (c == 0) 90 s = NULL; 91 else 92 s[-1] = 0; 93 *last = s; 94 return (tok); 95 } 96 } while (sc != 0); 97 } 98 /* NOTREACHED */ 99 } 100