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 35static 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 50char * 51strtok_r(char *s, const char *delim, char **lasts) 52{ 53 const char *spanp; 54 int c, sc; 55 char *tok; 56 57 /* s may be NULL */ 58 _DIAGASSERT(delim != NULL); 59 _DIAGASSERT(lasts != NULL); 60 61 if (s == NULL && (s = *lasts) == NULL) 62 return (NULL); 63 64 /* 65 * Skip (span) leading delimiters (s += strspn(s, delim), sort of). 66 */ 67cont: 68 c = *s++; 69 for (spanp = delim; (sc = *spanp++) != 0;) { 70 if (c == sc) 71 goto cont; 72 } 73 74 if (c == 0) { /* no non-delimiter characters */ 75 *lasts = NULL; 76 return (NULL); 77 } 78 tok = s - 1; 79 80 /* 81 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of). 82 * Note that delim must have one NUL; we stop if we see that, too. 83 */ 84 for (;;) { 85 c = *s++; 86 spanp = delim; 87 do { 88 if ((sc = *spanp++) == c) { 89 if (c == 0) 90 s = NULL; 91 else 92 s[-1] = 0; 93 *lasts = s; 94 return (tok); 95 } 96 } while (sc != 0); 97 } 98 /* NOTREACHED */ 99} 100