1 /*- 2 * Copyright (c) 1998 Softweyr LLC. All rights reserved. 3 * 4 * strtok_r, from Berkeley strtok 5 * Oct 13, 1998 by Wes Peters <wes@softweyr.com> 6 * 7 * Copyright (c) 1988, 1993 8 * The Regents of the University of California. All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notices, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notices, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 25 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SOFTWEYR LLC, THE 26 * REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 28 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 29 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 * 34 * @(#)strtok.c 8.1 (Berkeley) 6/4/93 35 * $FreeBSD: src/lib/libc/string/strtok.c,v 1.10 2007/12/12 18:33:06 wes Exp $ 36 * $DragonFly: src/lib/libc/string/strtok.c,v 1.3 2005/04/28 13:25:12 joerg Exp $ 37 */ 38 39 #include <stddef.h> 40 #ifdef DEBUG_STRTOK 41 #include <stdio.h> 42 #endif 43 #include <string.h> 44 45 char *__strtok_r(char *, const char *, char **); 46 47 __weak_reference(__strtok_r, strtok_r); 48 49 char * 50 __strtok_r(char *s, const char *delim, char **last) 51 { 52 const char *spanp; 53 int c, sc; 54 char *tok; 55 56 if (s == NULL && (s = *last) == NULL) 57 return (NULL); 58 59 /* 60 * Skip (span) leading delimiters (s += strspn(s, delim), sort of). 61 */ 62 cont: 63 c = *s++; 64 for (spanp = delim; (sc = *spanp++) != 0;) { 65 if (c == sc) 66 goto cont; 67 } 68 69 if (c == 0) { /* no non-delimiter characters */ 70 *last = NULL; 71 return (NULL); 72 } 73 tok = s - 1; 74 75 /* 76 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of). 77 * Note that delim must have one NUL; we stop if we see that, too. 78 */ 79 for (;;) { 80 c = *s++; 81 spanp = delim; 82 do { 83 if ((sc = *spanp++) == c) { 84 if (c == 0) 85 s = NULL; 86 else 87 s[-1] = '\0'; 88 *last = s; 89 return (tok); 90 } 91 } while (sc != 0); 92 } 93 /* NOTREACHED */ 94 } 95 96 char * 97 strtok(char *s, const char *delim) 98 { 99 static char *last; 100 101 return (__strtok_r(s, delim, &last)); 102 } 103 104 #ifdef DEBUG_STRTOK 105 /* 106 * Test the tokenizer. 107 */ 108 int 109 main(void) 110 { 111 char blah[80], test[80]; 112 char *brkb, *brkt, *phrase, *sep, *word; 113 114 sep = "\\/:;=-"; 115 phrase = "foo"; 116 117 printf("String tokenizer test:\n"); 118 strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function."); 119 for (word = strtok(test, sep); word; word = strtok(NULL, sep)) 120 printf("Next word is \"%s\".\n", word); 121 strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function."); 122 123 for (word = strtok_r(test, sep, &brkt); word; 124 word = strtok_r(NULL, sep, &brkt)) { 125 strcpy(blah, "blah:blat:blab:blag"); 126 127 for (phrase = strtok_r(blah, sep, &brkb); phrase; 128 phrase = strtok_r(NULL, sep, &brkb)) 129 printf("So far we're at %s:%s\n", word, phrase); 130 } 131 132 return (0); 133 } 134 135 #endif /* DEBUG_STRTOK */ 136