wctype/wctype.c

   1 /* Copyright (C) 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>, 1996.
   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 <endian.h>
  21 #include <string.h>
  22 #include <wctype.h>
  23 #include <locale/localeinfo.h>
  24
  25 wctype_t
  26 wctype (const char *property)
  27 {
  28   const char *names;
  29   wctype_t result;
  30   size_t proplen = strlen (property);
  31
  32   names = _NL_CURRENT (LC_CTYPE, _NL_CTYPE_CLASS_NAMES);
  33   for (result = 1; result != 0; result <<= 1)
  34     {
  35       size_t nameslen = strlen (names);
  36
  37       if (proplen == nameslen && memcmp (property, names, proplen) == 0)
  38         break;
  39
  40       names += nameslen + 1;
  41       if (names[0] == '\0')
  42         return 0;
  43     }
  44
  45 #if __BYTE_ORDER == __BIG_ENDIAN
  46   return result;
  47 #else
  48 #define XSWAPU32(w) \
  49   ((((w) & 0xff00ff00) >> 8) | (((w) & 0xff00ff) << 8))
  50
  51   return XSWAPU32 (result);
  52 #endif
  53 }