1 /* $NetBSD: strtok.c,v 1.5 1997/07/13 20:24:35 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1988 Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char *sccsid = "@(#)strtok.c 5.8 (Berkeley) 2/24/91"; 40 #else 41 __RCSID("$NetBSD: strtok.c,v 1.5 1997/07/13 20:24:35 christos Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include <string.h> 46 47 char * 48 strtok(s, delim) 49 register char *s; 50 register const char *delim; 51 { 52 register char *spanp; 53 register int c, sc; 54 char *tok; 55 static char *last; 56 57 58 if (s == NULL && (s = last) == NULL) 59 return (NULL); 60 61 /* 62 * Skip (span) leading delimiters (s += strspn(s, delim), sort of). 63 */ 64 cont: 65 c = *s++; 66 for (spanp = (char *)delim; (sc = *spanp++) != 0;) { 67 if (c == sc) 68 goto cont; 69 } 70 71 if (c == 0) { /* no non-delimiter characters */ 72 last = NULL; 73 return (NULL); 74 } 75 tok = s - 1; 76 77 /* 78 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of). 79 * Note that delim must have one NUL; we stop if we see that, too. 80 */ 81 for (;;) { 82 c = *s++; 83 spanp = (char *)delim; 84 do { 85 if ((sc = *spanp++) == c) { 86 if (c == 0) 87 s = NULL; 88 else 89 s[-1] = 0; 90 last = s; 91 return (tok); 92 } 93 } while (sc != 0); 94 } 95 /* NOTREACHED */ 96 } 97