wcsmbs/wcstok.c

   1 /* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <wchar.h>
  21 #include <errno.h>
  22
  23
  24 /* Parse WCS into tokens separated by characters in DELIM.  If WCS is
  25    NULL, the last string wcstok() was called with is used.  */
  26 wchar_t *
  27 wcstok (wcs, delim, save_ptr)
  28      wchar_t *wcs;
  29      const wchar_t *delim;
  30      wchar_t **save_ptr;
  31 {
  32   wchar_t *result;
  33
  34   if (wcs == NULL)
  35     {
  36       if (*save_ptr == NULL)
  37         {
  38           __set_errno (EINVAL);
  39           return NULL;
  40         }
  41       else
  42         wcs = *save_ptr;
  43     }
  44
  45   /* Scan leading delimiters.  */
  46   wcs += wcsspn (wcs, delim);
  47   if (*wcs == L'\0')
  48     {
  49       *save_ptr = NULL;
  50       return NULL;
  51     }
  52
  53   /* Find the end of the token.  */
  54   result = wcs;
  55   wcs = wcspbrk (result, delim);
  56   if (wcs == NULL)
  57     /* This token finishes the string.  */
  58     *save_ptr = NULL;
  59   else
  60     {
  61       /* Terminate the token and make *SAVE_PTR point past it.  */
  62       *wcs = L'\0';
  63       *save_ptr = wcs + 1;
  64     }
  65   return result;
  66 }