wcsmbs/wcstok.c

   1 /* Copyright (C) 1995, 1996 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3 Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>
   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
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, 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, ptr)
  28      register wchar_t *wcs;
  29      register const wchar_t *delim;
  30      register wchar_t **ptr;
  31 {
  32   wchar_t *result;
  33
  34   if (wcs == NULL)
  35     wcs = *ptr;
  36
  37   /* Scan leading delimiters.  */
  38   wcs += wcsspn (wcs, delim);
  39   if (*wcs == L'\0')
  40     {
  41       *ptr = NULL;
  42       return NULL;
  43     }
  44
  45   /* Find the end of the token.  */
  46   result = wcs;
  47   wcs = wcspbrk (result, delim);
  48   if (wcs == NULL)
  49     /* This token finishes the string.  */
  50     *ptr = NULL;
  51   else
  52     {
  53       /* Terminate the token and make OLDS point past it.  */
  54       *wcs = L'\0';
  55       *ptr = wcs + 1;
  56     }
  57   return result;
  58 }