wctype/wctype_l.c

   1 /* Copyright (C) 1996, 1997, 2000 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_l (const char *property, __locale_t locale)
  27 {
  28   const char *names;
  29   unsigned int result;
  30   size_t proplen = strlen (property);
  31
  32   names = locale->__locales[LC_CTYPE]->values[_NL_ITEM_INDEX (_NL_CTYPE_CLASS_NAMES)].string;
  33   for (result = 0; ; result++)
  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 (locale->__locales[LC_CTYPE]->values[_NL_ITEM_INDEX (_NL_CTYPE_HASH_SIZE)].word == 0)
  46     {
  47       /* Old locale format.  */
  48 #if __BYTE_ORDER == __BIG_ENDIAN
  49       return 1 << result;
  50 #else
  51 # define SWAPU32(w) \
  52   (((w) << 24) | (((w) & 0xff00) << 8) | (((w) >> 8) & 0xff00) | ((w) >> 24))
  53       return 1 << (result ^ 0x18); /* = SWAPU32 (1 << result); */
  54 #endif
  55     }
  56   else
  57     {
  58       /* New locale format.  */
  59       size_t i = locale->__locales[LC_CTYPE]->values[_NL_ITEM_INDEX (_NL_CTYPE_CLASS_OFFSET)].word + result;
  60       return (wctype_t) locale->__locales[LC_CTYPE]->values[i].string;
  61     }
  62 }