Update.
[glibc.git] / wctype / cname-lookup.h
blob77186d4aa42fcc79a735357d9d8421a2a354b1c4
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.
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.
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.
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. */
20 #include <endian.h>
21 #include "../locale/localeinfo.h"
23 /* Some words on the runtime of this functions. Although there is a
24 loop in the function the runtime is asymptotically quasi constant.
25 The reason is that even for the largest character sets HASH_LAYERS
26 will not grow beyond 15 (a guess!). */
27 #ifndef USE_IN_EXTENDED_LOCALE_MODEL
28 static __inline size_t
29 cname_lookup (wint_t wc)
30 #else
31 static __inline size_t
32 cname_lookup (wint_t wc, __locale_t locale)
33 #endif
35 unsigned int hash_size, hash_layers;
36 size_t result, cnt;
38 #ifndef USE_IN_EXTENDED_LOCALE_MODEL
39 extern unsigned int *__ctype_names;
40 hash_size = _NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_HASH_SIZE);
41 hash_layers = _NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_HASH_LAYERS);
42 #else
43 struct locale_data *current = locale->__locales[LC_CTYPE];
44 #if BYTE_ORDER == BIG_ENDIAN
45 unsigned int *__ctype_names =
46 (unsigned int *) current->values[_NL_ITEM_INDEX (_NL_CTYPE_NAMES_EB)].string;
47 #elif BYTE_ORDER == LITTLE_ENDIAN
48 unsigned int *__ctype_names =
49 (unsigned int *) current->values[_NL_ITEM_INDEX (_NL_CTYPE_NAMES_EL)].string;
50 #else
51 # error bizarre byte order
52 #endif
53 hash_size =
54 current->values[_NL_ITEM_INDEX (_NL_CTYPE_HASH_SIZE)].word;
55 hash_layers =
56 current->values[_NL_ITEM_INDEX (_NL_CTYPE_HASH_LAYERS)].word;
57 #endif
59 result = wc % hash_size;
60 for (cnt = 0; cnt < hash_layers; ++cnt)
62 if (__ctype_names[result] == wc)
63 break;
64 result += hash_size;
67 return cnt < hash_layers ? result : ~((size_t) 0);