1 /* $NetBSD: strtok.cpp,v 1.2 2005/12/11 12:17:30 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1993 5 * The Regents of the University of California. 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 #include <sys/types.h> 34 #include <stdlib.h> 35 #include <libsa_string.h> 36 37 LIBSA_NAMESPACE_BEGIN 38 __BEGIN_DECLS 39 char * 40 strtok(char *s, const char *delim) 41 { 42 const char *spanp; 43 int c, sc; 44 char *tok; 45 static char *last; 46 47 if (s == NULL && (s = last) == NULL) 48 return (NULL); 49 50 /* 51 * Skip (span) leading delimiters (s += strspn(s, delim), sort of). 52 */ 53 cont: 54 c = *s++; 55 for (spanp = delim; (sc = *spanp++) != 0;) { 56 if (c == sc) 57 goto cont; 58 } 59 60 if (c == 0) { /* no non-delimiter characters */ 61 last = NULL; 62 return (NULL); 63 } 64 tok = s - 1; 65 66 /* 67 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of). 68 * Note that delim must have one NUL; we stop if we see that, too. 69 */ 70 for (;;) { 71 c = *s++; 72 spanp = delim; 73 do { 74 if ((sc = *spanp++) == c) { 75 if (c == 0) 76 s = NULL; 77 else 78 s[-1] = 0; 79 last = s; 80 return (tok); 81 } 82 } while (sc != 0); 83 } 84 /* NOTREACHED */ 85 } 86 __END_DECLS 87 LIBSA_NAMESPACE_END 88