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/* Combining classes of Unicode characters.
Copyright (C) 2002, 2006, 2009-2022 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2002.
This file 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.
This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "unictype.h"
/* Define u_combclass table. */
#include "combiningclass.h"
int
uc_combining_class (ucs4_t uc)
{
unsigned int index1 = uc >> combclass_header_0;
if (index1 < combclass_header_1)
{
int lookup1 = u_combclass.level1[index1];
if (lookup1 >= 0)
{
unsigned int index2 = (uc >> combclass_header_2) & combclass_header_3;
int lookup2 = u_combclass.level2[lookup1 + index2];
if (lookup2 >= 0)
{
unsigned int index3 = (uc & combclass_header_4);
unsigned int lookup3 = u_combclass.level3[lookup2 + index3];
return lookup3;
}
}
}
return 0;
}
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