1 /* 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. 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[] = "@(#)strtok.c 8.1 (Berkeley) 6/4/93"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <stddef.h> 39 #include <string.h> 40 41 char * 42 strtok(s, delim) 43 register char *s; 44 register const char *delim; 45 { 46 register char *spanp; 47 register int c, sc; 48 char *tok; 49 static char *last; 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