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/* Combining classes of Unicode characters.
Copyright (C) 2002, 2006, 2009-2018 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2002.
This program is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
or both in parallel, as here.
This program 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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