firmware/libc/strtok.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Daniel Stenberg
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied. *
  19  ****************************************************************************/
  20
  21 #include "config.h"
  22
  23 #ifndef HAVE_STRTOK_R
  24 #include <stddef.h>
  25 #include <string.h>
  26
  27 char *
  28 strtok_r(char *ptr, const char *sep, char **end)
  29 {
  30     if (!ptr)
  31         /* we got NULL input so then we get our last position instead */
  32         ptr = *end;
  33
  34     /* pass all letters that are including in the separator string */
  35     while (*ptr && strchr(sep, *ptr))
  36         ++ptr;
  37
  38     if (*ptr) {
  39         /* so this is where the next piece of string starts */
  40         char *start = ptr;
  41
  42         /* set the end pointer to the first byte after the start */
  43         *end = start + 1;
  44
  45         /* scan through the string to find where it ends, it ends on a
  46            null byte or a character that exists in the separator string */
  47         while (**end && !strchr(sep, **end))
  48             ++*end;
  49
  50         if (**end) {
  51             /* the end is not a null byte */
  52             **end = '\0';  /* zero terminate it! */
  53             ++*end;        /* advance last pointer to beyond the null byte */
  54         }
  55
  56         return start; /* return the position where the string starts */
  57     }
  58
  59     /* we ended up on a null byte, there are no more strings to find! */
  60     return NULL;
  61 }
  62
  63 #endif /* this was only compiled if strtok_r wasn't present */