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 *sccsid = "from: @(#)strtok.c 5.8 (Berkeley) 2/24/91";*/ 36 static char *rcsid = "$Id: strtok.c,v 1.3 1993/08/26 00:52:01 jtc Exp $"; 37 #endif /* LIBC_SCCS and not lint */ 38 39 #include <stddef.h> 40 #include <string.h> 41 42 char * 43 strtok(s, delim) 44 register char *s; 45 register const char *delim; 46 { 47 register char *spanp; 48 register int c, sc; 49 char *tok; 50 static char *last; 51 52 53 if (s == NULL && (s = last) == NULL) 54 return (NULL); 55 56 /* 57 * Skip (span) leading delimiters (s += strspn(s, delim), sort of). 58 */ 59 cont: 60 c = *s++; 61 for (spanp = (char *)delim; (sc = *spanp++) != 0;) { 62 if (c == sc) 63 goto cont; 64 } 65 66 if (c == 0) { /* no non-delimiter characters */ 67 last = NULL; 68 return (NULL); 69 } 70 tok = s - 1; 71 72 /* 73 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of). 74 * Note that delim must have one NUL; we stop if we see that, too. 75 */ 76 for (;;) { 77 c = *s++; 78 spanp = (char *)delim; 79 do { 80 if ((sc = *spanp++) == c) { 81 if (c == 0) 82 s = NULL; 83 else 84 s[-1] = 0; 85 last = s; 86 return (tok); 87 } 88 } while (sc != 0); 89 } 90 /* NOTREACHED */ 91 } 92