1 /* $NetBSD: strtok_r.c,v 1.8 2000/01/22 22:19:20 mycroft 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 1.8 2000/01/22 22:19:20 mycroft Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 47 #include <assert.h> 48 #include <string.h> 49 50 #ifdef __weak_alias 51 __weak_alias(strtok_r,_strtok_r) 52 #endif 53 54 char * 55 strtok_r(s, delim, lasts) 56 char *s; 57 const char *delim; 58 char **lasts; 59 { 60 const char *spanp; 61 int c, sc; 62 char *tok; 63 64 /* s may be NULL */ 65 _DIAGASSERT(delim != NULL); 66 _DIAGASSERT(lasts != NULL); 67 68 if (s == NULL && (s = *lasts) == NULL) 69 return (NULL); 70 71 /* 72 * Skip (span) leading delimiters (s += strspn(s, delim), sort of). 73 */ 74 cont: 75 c = *s++; 76 for (spanp = delim; (sc = *spanp++) != 0;) { 77 if (c == sc) 78 goto cont; 79 } 80 81 if (c == 0) { /* no non-delimiter characters */ 82 *lasts = NULL; 83 return (NULL); 84 } 85 tok = s - 1; 86 87 /* 88 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of). 89 * Note that delim must have one NUL; we stop if we see that, too. 90 */ 91 for (;;) { 92 c = *s++; 93 spanp = delim; 94 do { 95 if ((sc = *spanp++) == c) { 96 if (c == 0) 97 s = NULL; 98 else 99 s[-1] = 0; 100 *lasts = s; 101 return (tok); 102 } 103 } while (sc != 0); 104 } 105 /* NOTREACHED */ 106 } 107