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/* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <endian.h>
#include "../locale/localeinfo.h"
/* Some words on the runtime of this functions. Although there is a
loop in the function the runtime is asymptotically quasi constant.
The reason is that even for the largest character sets HASH_LAYERS
will not grow beyond 15 (a guess!). */
#ifndef USE_IN_EXTENDED_LOCALE_MODEL
static __inline size_t
cname_lookup (wint_t wc)
#else
static __inline size_t
cname_lookup (wint_t wc, __locale_t locale)
#endif
{
unsigned int hash_size, hash_layers;
size_t result, cnt;
#ifndef USE_IN_EXTENDED_LOCALE_MODEL
extern unsigned int *__ctype_names;
hash_size = _NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_HASH_SIZE);
hash_layers = _NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_HASH_LAYERS);
#else
struct locale_data *current = locale->__locales[LC_CTYPE];
#if BYTE_ORDER == BIG_ENDIAN
unsigned int *__ctype_names =
(unsigned int *) current->values[_NL_ITEM_INDEX (_NL_CTYPE_NAMES_EB)].string;
#elif BYTE_ORDER == LITTLE_ENDIAN
unsigned int *__ctype_names =
(unsigned int *) current->values[_NL_ITEM_INDEX (_NL_CTYPE_NAMES_EL)].string;
#else
# error bizarre byte order
#endif
hash_size =
current->values[_NL_ITEM_INDEX (_NL_CTYPE_HASH_SIZE)].word;
hash_layers =
current->values[_NL_ITEM_INDEX (_NL_CTYPE_HASH_LAYERS)].word;
#endif
result = wc % hash_size;
for (cnt = 0; cnt < hash_layers; ++cnt)
{
if (__ctype_names[result] == wc)
break;
result += hash_size;
}
return cnt < hash_layers ? result : ~((size_t) 0);
}
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