diff options
Diffstat (limited to 'locale/coll-lookup.c')
| -rw-r--r-- | locale/coll-lookup.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/locale/coll-lookup.c b/locale/coll-lookup.c new file mode 100644 index 0000000000..6c765727cc --- /dev/null +++ b/locale/coll-lookup.c @@ -0,0 +1,81 @@ +/* Copyright (C) 2000, 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Bruno Haible <haible@clisp.cons.org>, 2000. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <stdint.h> + +/* Lookup in a table of int32_t, with default value 0. */ +int32_t +internal_function +__collidx_table_lookup (const char *table, uint32_t wc) +{ + uint32_t shift1 = ((const uint32_t *) table)[0]; + uint32_t index1 = wc >> shift1; + uint32_t bound = ((const uint32_t *) table)[1]; + if (index1 < bound) + { + uint32_t lookup1 = ((const uint32_t *) table)[5 + index1]; + if (lookup1 != 0) + { + uint32_t shift2 = ((const uint32_t *) table)[2]; + uint32_t mask2 = ((const uint32_t *) table)[3]; + uint32_t index2 = (wc >> shift2) & mask2; + uint32_t lookup2 = ((const uint32_t *)(table + lookup1))[index2]; + if (lookup2 != 0) + { + uint32_t mask3 = ((const uint32_t *) table)[4]; + uint32_t index3 = wc & mask3; + int32_t lookup3 = ((const int32_t *)(table + lookup2))[index3]; + + return lookup3; + } + } + } + return 0; +} + + +/* Lookup in a table of uint32_t, with default value 0xffffffff. */ +uint32_t +internal_function +__collseq_table_lookup (const char *table, uint32_t wc) +{ + uint32_t shift1 = ((const uint32_t *) table)[0]; + uint32_t index1 = wc >> shift1; + uint32_t bound = ((const uint32_t *) table)[1]; + if (index1 < bound) + { + uint32_t lookup1 = ((const uint32_t *) table)[5 + index1]; + if (lookup1 != 0) + { + uint32_t shift2 = ((const uint32_t *) table)[2]; + uint32_t mask2 = ((const uint32_t *) table)[3]; + uint32_t index2 = (wc >> shift2) & mask2; + uint32_t lookup2 = ((const uint32_t *)(table + lookup1))[index2]; + if (lookup2 != 0) + { + uint32_t mask3 = ((const uint32_t *) table)[4]; + uint32_t index3 = wc & mask3; + uint32_t lookup3 = ((const uint32_t *)(table + lookup2))[index3]; + + return lookup3; + } + } + } + return ~((uint32_t) 0); +} |