1  /* Copyright (C) 1995-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <wchar.h>
      19  #include <errno.h>
      20  
      21  
      22  /* Parse WCS into tokens separated by characters in DELIM.  If WCS is
      23     NULL, the last string wcstok() was called with is used.  */
      24  wchar_t *
      25  wcstok (wchar_t *wcs, const wchar_t *delim, wchar_t **save_ptr)
      26  {
      27    wchar_t *result;
      28  
      29    if (wcs == NULL)
      30      {
      31        if (*save_ptr == NULL)
      32  	{
      33  	  __set_errno (EINVAL);
      34  	  return NULL;
      35  	}
      36        else
      37  	wcs = *save_ptr;
      38      }
      39  
      40    /* Scan leading delimiters.  */
      41    wcs += wcsspn (wcs, delim);
      42    if (*wcs == L'\0')
      43      {
      44        *save_ptr = NULL;
      45        return NULL;
      46      }
      47  
      48    /* Find the end of the token.	 */
      49    result = wcs;
      50    wcs = wcspbrk (result, delim);
      51    if (wcs == NULL)
      52      /* This token finishes the string.	*/
      53      *save_ptr = NULL;
      54    else
      55      {
      56        /* Terminate the token and make *SAVE_PTR point past it.  */
      57        *wcs = L'\0';
      58        *save_ptr = wcs + 1;
      59      }
      60    return result;
      61  }