mirror of git://sourceware.org/git/glibc.git
78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
/* Copyright (C) 2000-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdint.h>
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/* Lookup in a table of int32_t, with default value 0. */
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int32_t
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__collidx_table_lookup (const char *table, uint32_t wc)
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{
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uint32_t shift1 = ((const uint32_t *) table)[0];
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uint32_t index1 = wc >> shift1;
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uint32_t bound = ((const uint32_t *) table)[1];
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if (index1 < bound)
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{
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uint32_t lookup1 = ((const uint32_t *) table)[5 + index1];
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if (lookup1 != 0)
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{
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uint32_t shift2 = ((const uint32_t *) table)[2];
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uint32_t mask2 = ((const uint32_t *) table)[3];
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uint32_t index2 = (wc >> shift2) & mask2;
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uint32_t lookup2 = ((const uint32_t *)(table + lookup1))[index2];
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if (lookup2 != 0)
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{
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uint32_t mask3 = ((const uint32_t *) table)[4];
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uint32_t index3 = wc & mask3;
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int32_t lookup3 = ((const int32_t *)(table + lookup2))[index3];
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return lookup3;
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}
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}
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}
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return 0;
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}
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/* Lookup in a table of uint32_t, with default value 0xffffffff. */
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uint32_t
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__collseq_table_lookup (const char *table, uint32_t wc)
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{
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uint32_t shift1 = ((const uint32_t *) table)[0];
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uint32_t index1 = wc >> shift1;
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uint32_t bound = ((const uint32_t *) table)[1];
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if (index1 < bound)
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{
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uint32_t lookup1 = ((const uint32_t *) table)[5 + index1];
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if (lookup1 != 0)
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{
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uint32_t shift2 = ((const uint32_t *) table)[2];
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uint32_t mask2 = ((const uint32_t *) table)[3];
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uint32_t index2 = (wc >> shift2) & mask2;
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uint32_t lookup2 = ((const uint32_t *)(table + lookup1))[index2];
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if (lookup2 != 0)
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{
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uint32_t mask3 = ((const uint32_t *) table)[4];
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uint32_t index3 = wc & mask3;
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uint32_t lookup3 = ((const uint32_t *)(table + lookup2))[index3];
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return lookup3;
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}
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}
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}
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return ~((uint32_t) 0);
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}
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