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 * 3. 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: head/lib/libc/string/strtok.c 251069 2013-05-28 20:57:40Z emaste $ 36 */ 37 38 #include <stddef.h> 39 #ifdef DEBUG_STRTOK 40 #include <stdio.h> 41 #endif 42 #include <string.h> 43 44 char *__strtok_r(char *, const char *, char **); 45 46 char * 47 __strtok_r(char * __restrict s, const char * __restrict delim, 48 char ** __restrict last) 49 { 50 char *spanp, *tok; 51 int c, sc; 52 53 if (s == NULL && (s = *last) == NULL) 54 return (NULL); 55 56 /* 57 * Skip (span) leading delimiters (s += strspn(s, delim), sort of). 58 */ 59 cont: 60 c = *s++; 61 for (spanp = (char *)delim; (sc = *spanp++) != 0;) { 62 if (c == sc) 63 goto cont; 64 } 65 66 if (c == 0) { /* no non-delimiter characters */ 67 *last = NULL; 68 return (NULL); 69 } 70 tok = s - 1; 71 72 /* 73 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of). 74 * Note that delim must have one NUL; we stop if we see that, too. 75 */ 76 for (;;) { 77 c = *s++; 78 spanp = (char *)delim; 79 do { 80 if ((sc = *spanp++) == c) { 81 if (c == 0) 82 s = NULL; 83 else 84 s[-1] = '\0'; 85 *last = s; 86 return (tok); 87 } 88 } while (sc != 0); 89 } 90 /* NOTREACHED */ 91 } 92 93 __weak_reference(__strtok_r, strtok_r); 94 95 char * 96 strtok(char *s, const char *delim) 97 { 98 static char *last; 99 100 return (__strtok_r(s, delim, &last)); 101 } 102 103 #ifdef DEBUG_STRTOK 104 /* 105 * Test the tokenizer. 106 */ 107 int 108 main(void) 109 { 110 char blah[80], test[80]; 111 char *brkb, *brkt, *phrase, *sep, *word; 112 113 sep = "\\/:;=-"; 114 phrase = "foo"; 115 116 printf("String tokenizer test:\n"); 117 strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function."); 118 for (word = strtok(test, sep); word; word = strtok(NULL, sep)) 119 printf("Next word is \"%s\".\n", word); 120 strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function."); 121 122 for (word = strtok_r(test, sep, &brkt); word; 123 word = strtok_r(NULL, sep, &brkt)) { 124 strcpy(blah, "blah:blat:blab:blag"); 125 126 for (phrase = strtok_r(blah, sep, &brkb); phrase; 127 phrase = strtok_r(NULL, sep, &brkb)) 128 printf("So far we're at %s:%s\n", word, phrase); 129 } 130 131 return (0); 132 } 133 134 #endif /* DEBUG_STRTOK */ 135