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