1 /* $NetBSD: strtok_r.c,v 1.9 2003/08/07 16:43:53 agc 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char *sccsid = "@(#)strtok.c 5.8 (Berkeley) 2/24/91"; 36 #else 37 __RCSID("$NetBSD: strtok_r.c,v 1.9 2003/08/07 16:43:53 agc Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 43 #include <assert.h> 44 #include <string.h> 45 46 #ifdef __weak_alias 47 __weak_alias(strtok_r,_strtok_r) 48 #endif 49 50 char * 51 strtok_r(s, delim, lasts) 52 char *s; 53 const char *delim; 54 char **lasts; 55 { 56 const char *spanp; 57 int c, sc; 58 char *tok; 59 60 /* s may be NULL */ 61 _DIAGASSERT(delim != NULL); 62 _DIAGASSERT(lasts != NULL); 63 64 if (s == NULL && (s = *lasts) == NULL) 65 return (NULL); 66 67 /* 68 * Skip (span) leading delimiters (s += strspn(s, delim), sort of). 69 */ 70 cont: 71 c = *s++; 72 for (spanp = delim; (sc = *spanp++) != 0;) { 73 if (c == sc) 74 goto cont; 75 } 76 77 if (c == 0) { /* no non-delimiter characters */ 78 *lasts = NULL; 79 return (NULL); 80 } 81 tok = s - 1; 82 83 /* 84 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of). 85 * Note that delim must have one NUL; we stop if we see that, too. 86 */ 87 for (;;) { 88 c = *s++; 89 spanp = delim; 90 do { 91 if ((sc = *spanp++) == c) { 92 if (c == 0) 93 s = NULL; 94 else 95 s[-1] = 0; 96 *lasts = s; 97 return (tok); 98 } 99 } while (sc != 0); 100 } 101 /* NOTREACHED */ 102 } 103