lib/other/strtok_r.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  *
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notices, this list of conditions and the following disclaimer.
  16  *
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notices, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *
  24  *      This product includes software developed by Softweyr LLC, the
  25  *      University of California, Berkeley, and its contributors.
  26  *
  27  * 4. Neither the name of the University nor the names of its contributors
  28  *    may be used to endorse or promote products derived from this software
  29  *    without specific prior written permission.
  30  *
  31  * THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS
  32  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  34  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL SOFTWEYR LLC, THE
  35  * REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  36  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  37  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  38  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  39  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  40  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  41  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  42  */
  43
  44 #ifndef lint
  45 static const char rcsid[] =
  46   "$FreeBSD: src/lib/libc/string/strtok.c,v 1.2.6.1 2001/07/09 23:30:07 obrien Exp $";
  47 #endif
  48
  49 #include <stddef.h>
  50 #include <string.h>
  51
  52 char *
  53 strtok_r(char *s, const char *delim, char **last)
  54 {
  55     char *spanp;
  56     int c, sc;
  57     char *tok;
  58
  59     if (s == NULL && (s = *last) == NULL)
  60     {
  61         return NULL;
  62     }
  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     {
  71         if (c == sc)
  72         {
  73             goto cont;
  74         }
  75     }
  76
  77     if (c == 0)         /* no non-delimiter characters */
  78     {
  79         *last = NULL;
  80         return NULL;
  81     }
  82     tok = s - 1;
  83
  84     /*
  85      * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
  86      * Note that delim must have one NUL; we stop if we see that, too.
  87      */
  88     for (;;)
  89     {
  90         c = *s++;
  91         spanp = (char *)delim;
  92         do
  93         {
  94             if ((sc = *spanp++) == c)
  95             {
  96                 if (c == 0)
  97                 {
  98                     s = NULL;
  99                 }
 100                 else
 101                 {
 102                     char *w = s - 1;
 103                     *w = '\0';
 104                 }
 105                 *last = s;
 106                 return tok;
 107             }
 108         }
 109         while (sc != 0);
 110     }
 111     /* NOTREACHED */
 112 }
 113
 114
 115 #if 0
 116 char *
 117 strtok(char *s, const char *delim)
 118 {
 119     static char *last;
 120
 121     return strtok_r(s, delim, &last);
 122 }
 123 #endif
 124
 125 #if defined(DEBUG_STRTOK)
 126
 127 /*
 128  * Test the tokenizer.
 129  */
 130 int
 131 main()
 132 {
 133     char test[80], blah[80];
 134     char *sep = "\\/:;=-";
 135     char *word, *phrase, *brkt, *brkb;
 136
 137     printf("String tokenizer test:\n");
 138
 139     strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
 140
 141     for (word = strtok(test, sep);
 142          word;
 143          word = strtok(NULL, sep))
 144     {
 145         printf("Next word is \"%s\".\n", word);
 146     }
 147
 148     phrase = "foo";
 149
 150     strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
 151
 152     for (word = strtok_r(test, sep, &brkt);
 153          word;
 154          word = strtok_r(NULL, sep, &brkt))
 155     {
 156         strcpy(blah, "blah:blat:blab:blag");
 157
 158         for (phrase = strtok_r(blah, sep, &brkb);
 159              phrase;
 160              phrase = strtok_r(NULL, sep, &brkb))
 161         {
 162             printf("So far we're at %s:%s\n", word, phrase);
 163         }
 164     }
 165
 166     return 0;
 167 }
 168
 169 #endif /* DEBUG_STRTOK */