/* Copyright (C) 1995-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <wchar.h>

#include <errno.h>

/* Parse WCS into tokens separated by characters in DELIM.  If WCS is

   NULL, the last string wcstok() was called with is used.  */

wchar_t *

wcstok (wchar_t *wcs, const wchar_t *delim, wchar_t **save_ptr)

{

  wchar_t *result;

  if (wcs == NULL)

    {

      if (*save_ptr == NULL)

	{

	  __set_errno (EINVAL);

	  return NULL;

	}

      else

	wcs = *save_ptr;

    }

  /* Scan leading delimiters.  */

  wcs += wcsspn (wcs, delim);

  if (*wcs == L'\0')

    {

      *save_ptr = NULL;

      return NULL;

    }

  /* Find the end of the token.	 */

  result = wcs;

  wcs = wcspbrk (result, delim);

  if (wcs == NULL)

    /* This token finishes the string.	*/

    *save_ptr = NULL;

  else

    {

      /* Terminate the token and make *SAVE_PTR point past it.  */

      *wcs = L'\0';

      *save_ptr = wcs + 1;

    }

  return result;

}