lib/wcstok-impl.h

   1 /* Split a wide string into tokens.
   2    Copyright (C) 1999, 2011-2024 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 1999.
   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 wchar_t *
  19 wcstok (wchar_t *wcs, const wchar_t *delim, wchar_t **ptr)
  20 {
  21   if (wcs == NULL)
  22     {
  23       wcs = *ptr;
  24       if (wcs == NULL)
  25         return NULL; /* reminder that end of token sequence has been reached */
  26     }
  27
  28   /* Skip leading delimiters.  */
  29   wcs += wcsspn (wcs, delim);
  30
  31   /* Found a token?  */
  32   if (*wcs == (wchar_t)'\0')
  33     {
  34       *ptr = NULL;
  35       return NULL;
  36     }
  37   /* Move past the token.  */
  38   {
  39     wchar_t *token_end = wcspbrk (wcs, delim);
  40     if (token_end)
  41       {
  42         /* NUL-terminate the token.  */
  43         *token_end = (wchar_t)'\0';
  44         *ptr = token_end + 1;
  45       }
  46     else
  47       *ptr = NULL;
  48   }
  49   return wcs;
  50 }