lib/mbstok_r.c

   1 /* Tokenizing a string.
   2    Copyright (C) 1999, 2002, 2006-2024 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2007.
   4
   5    This file is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation, either version 3 of the
   8    License, or (at your option) any later version.
   9
  10    This file is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <config.h>
  19
  20 /* Specification.  */
  21 #include <string.h>
  22
  23 #include <stdlib.h>
  24
  25 char *
  26 mbstok_r (char *string, const char *delim, char **save_ptr)
  27 {
  28   if (MB_CUR_MAX > 1)
  29     {
  30       if (string == NULL)
  31         {
  32           string = *save_ptr;
  33           if (string == NULL)
  34             return NULL; /* reminder that end of token sequence has been
  35                             reached */
  36         }
  37
  38       /* Skip leading delimiters.  */
  39       string += mbsspn (string, delim);
  40
  41       /* Found a token?  */
  42       if (*string == '\0')
  43         {
  44           *save_ptr = NULL;
  45           return NULL;
  46         }
  47
  48       /* Move past the token.  */
  49       {
  50         char *token_end = mbspbrk (string, delim);
  51
  52         if (token_end != NULL)
  53           {
  54             /* NUL-terminate the token.  */
  55             *token_end = '\0';
  56             *save_ptr = token_end + 1;
  57           }
  58         else
  59           *save_ptr = NULL;
  60       }
  61
  62       return string;
  63     }
  64   else
  65     return strtok_r (string, delim, save_ptr);
  66 }