1 /* $NetBSD: strtok_r.c,v 1.5 1998/11/15 17:21:49 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_r.c,v 1.5 1998/11/15 17:21:49 christos Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 #include <string.h> 47 48 #ifdef __weak_alias 49 __weak_alias(strtok_r,_strtok_r); 50 #endif 51 52 char * 53 strtok_r(s, delim, lasts) 54 char *s; 55 const char *delim; 56 char **lasts; 57 { 58 const char *spanp; 59 int c, sc; 60 char *tok; 61 62 if (s == NULL && (s = *lasts) == NULL) 63 return (NULL); 64 65 /* 66 * Skip (span) leading delimiters (s += strspn(s, delim), sort of). 67 */ 68 cont: 69 c = *s++; 70 for (spanp = delim; (sc = *spanp++) != 0;) { 71 if (c == sc) 72 goto cont; 73 } 74 75 if (c == 0) { /* no non-delimiter characters */ 76 *lasts = NULL; 77 return (NULL); 78 } 79 tok = s - 1; 80 81 /* 82 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of). 83 * Note that delim must have one NUL; we stop if we see that, too. 84 */ 85 for (;;) { 86 c = *s++; 87 spanp = delim; 88 do { 89 if ((sc = *spanp++) == c) { 90 if (c == 0) 91 s = NULL; 92 else 93 s[-1] = 0; 94 *lasts = s; 95 return (tok); 96 } 97 } while (sc != 0); 98 } 99 /* NOTREACHED */ 100 } 101