string/FreeBSD/strtok.c

   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
  35 #if defined(LIBC_SCCS) && !defined(lint)
  36 static char sccsid[] = "@(#)strtok.c    8.1 (Berkeley) 6/4/93";
  37 #endif /* LIBC_SCCS and not lint */
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD: src/lib/libc/string/strtok.c,v 1.10 2007/12/12 18:33:06 wes Exp $");
  40
  41 #include <stddef.h>
  42 #ifdef DEBUG_STRTOK
  43 #include <stdio.h>
  44 #endif
  45 #include <string.h>
  46
  47 char    *__strtok_r(char *, const char *, char **);
  48
  49 __weak_reference(__strtok_r, strtok_r);
  50
  51 char *
  52 __strtok_r(char *s, const char *delim, char **last)
  53 {
  54         char *spanp, *tok;
  55         int c, sc;
  56
  57         if (s == NULL && (s = *last) == NULL)
  58                 return (NULL);
  59
  60         /*
  61          * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
  62          */
  63 cont:
  64         c = *s++;
  65         for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
  66                 if (c == sc)
  67                         goto cont;
  68         }
  69
  70         if (c == 0) {           /* no non-delimiter characters */
  71                 *last = NULL;
  72                 return (NULL);
  73         }
  74         tok = s - 1;
  75
  76         /*
  77          * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
  78          * Note that delim must have one NUL; we stop if we see that, too.
  79          */
  80         for (;;) {
  81                 c = *s++;
  82                 spanp = (char *)delim;
  83                 do {
  84                         if ((sc = *spanp++) == c) {
  85                                 if (c == 0)
  86                                         s = NULL;
  87                                 else
  88                                         s[-1] = '\0';
  89                                 *last = s;
  90                                 return (tok);
  91                         }
  92                 } while (sc != 0);
  93         }
  94         /* NOTREACHED */
  95 }
  96
  97 char *
  98 strtok(char *s, const char *delim)
  99 {
 100         static char *last;
 101
 102         return (__strtok_r(s, delim, &last));
 103 }
 104
 105 #ifdef DEBUG_STRTOK
 106 /*
 107  * Test the tokenizer.
 108  */
 109 int
 110 main(void)
 111 {
 112         char blah[80], test[80];
 113         char *brkb, *brkt, *phrase, *sep, *word;
 114
 115         sep = "\\/:;=-";
 116         phrase = "foo";
 117
 118         printf("String tokenizer test:\n");
 119         strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
 120         for (word = strtok(test, sep); word; word = strtok(NULL, sep))
 121                 printf("Next word is \"%s\".\n", word);
 122         strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
 123
 124         for (word = strtok_r(test, sep, &brkt); word;
 125             word = strtok_r(NULL, sep, &brkt)) {
 126                 strcpy(blah, "blah:blat:blab:blag");
 127
 128                 for (phrase = strtok_r(blah, sep, &brkb); phrase;
 129                     phrase = strtok_r(NULL, sep, &brkb))
 130                         printf("So far we're at %s:%s\n", word, phrase);
 131         }
 132
 133         return (0);
 134 }
 135
 136 #endif /* DEBUG_STRTOK */