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