wctype/iswctype.c

   1 /* Copyright (C) 1996-2023 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 <ctype.h>
  19 #include <wctype.h>
  20
  21 #include "wchar-lookup.h"
  22
  23 #undef __iswctype
  24
  25 int
  26 __iswctype (wint_t wc, wctype_t desc)
  27 {
  28   /* If the user passes in an invalid DESC valid (the one returned from
  29      `wctype' in case of an error) simply return 0.  */
  30   if (desc == (wctype_t) 0)
  31     return 0;
  32
  33   return wctype_table_lookup ((const char *) desc, wc);
  34 }
  35 libc_hidden_def (__iswctype)
  36 weak_alias (__iswctype, iswctype)