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  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by Softweyr LLC, the
  21  *      University of California, Berkeley, and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS
  27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  28  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  29  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL SOFTWEYR LLC, THE
  30  * REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  31  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  32  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  33  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  34  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  35  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  36  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37  */
  38
  39 #if defined(LIBC_SCCS) && !defined(lint)
  40 static char sccsid[] = "@(#)strtok.c    8.1 (Berkeley) 6/4/93";
  41 #endif /* LIBC_SCCS and not lint */
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD: src/lib/libc/string/strtok.c,v 1.9 2002/09/07 02:53:19 tjr Exp $");
  44
  45 #include <stddef.h>
  46 #ifdef DEBUG_STRTOK
  47 #include <stdio.h>
  48 #endif
  49 #include <string.h>
  50
  51 char    *__strtok_r(char *, const char *, char **);
  52
  53 __weak_reference(__strtok_r, strtok_r);
  54
  55 char *
  56 __strtok_r(char *s, const char *delim, char **last)
  57 {
  58         char *spanp, *tok;
  59         int c, sc;
  60
  61         if (s == NULL && (s = *last) == NULL)
  62                 return (NULL);
  63
  64         /*
  65          * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
  66          */
  67 cont:
  68         c = *s++;
  69         for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
  70                 if (c == sc)
  71                         goto cont;
  72         }
  73
  74         if (c == 0) {           /* no non-delimiter characters */
  75                 *last = NULL;
  76                 return (NULL);
  77         }
  78         tok = s - 1;
  79
  80         /*
  81          * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
  82          * Note that delim must have one NUL; we stop if we see that, too.
  83          */
  84         for (;;) {
  85                 c = *s++;
  86                 spanp = (char *)delim;
  87                 do {
  88                         if ((sc = *spanp++) == c) {
  89                                 if (c == 0)
  90                                         s = NULL;
  91                                 else
  92                                         s[-1] = '\0';
  93                                 *last = s;
  94                                 return (tok);
  95                         }
  96                 } while (sc != 0);
  97         }
  98         /* NOTREACHED */
  99 }
 100
 101 char *
 102 strtok(char *s, const char *delim)
 103 {
 104         static char *last;
 105
 106         return (__strtok_r(s, delim, &last));
 107 }
 108
 109 #ifdef DEBUG_STRTOK
 110 /*
 111  * Test the tokenizer.
 112  */
 113 int
 114 main(void)
 115 {
 116         char blah[80], test[80];
 117         char *brkb, *brkt, *phrase, *sep, *word;
 118
 119         sep = "\\/:;=-";
 120         phrase = "foo";
 121
 122         printf("String tokenizer test:\n");
 123         strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
 124         for (word = strtok(test, sep); word; word = strtok(NULL, sep))
 125                 printf("Next word is \"%s\".\n", word);
 126         strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
 127
 128         for (word = strtok_r(test, sep, &brkt); word;
 129             word = strtok_r(NULL, sep, &brkt)) {
 130                 strcpy(blah, "blah:blat:blab:blag");
 131
 132                 for (phrase = strtok_r(blah, sep, &brkb); phrase;
 133                     phrase = strtok_r(NULL, sep, &brkb))
 134                         printf("So far we're at %s:%s\n", word, phrase);
 135         }
 136
 137         return (0);
 138 }
 139
 140 #endif /* DEBUG_STRTOK */