diff options
Diffstat (limited to 'wctype/cname-lookup.h')
-rw-r--r-- | wctype/cname-lookup.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/wctype/cname-lookup.h b/wctype/cname-lookup.h new file mode 100644 index 0000000000..bef38a12d3 --- /dev/null +++ b/wctype/cname-lookup.h @@ -0,0 +1,45 @@ +/* Copyright (C) 1996 Free Software Foundation, Inc. +This file is part of the GNU C Library. +Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>. + +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 "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!). */ +static __inline size_t +cname_lookup (wint_t wc) +{ + extern unsigned int *__ctype_names; + unsigned int hash_size, hash_layers; + size_t result, cnt; + + hash_size = _NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_HASH_SIZE); + hash_layers = _NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_HASH_LAYERS); + + 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); +} |