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/* Combining classes of Unicode characters.
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Copyright (C) 2002, 2006, 2009-2020 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2002.
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This program is free software: you can redistribute it and/or
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modify it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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or both in parallel, as here.
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This program 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 License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include "unictype.h"
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/* Define u_combclass table. */
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#include "combiningclass.h"
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int
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uc_combining_class (ucs4_t uc)
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{
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unsigned int index1 = uc >> combclass_header_0;
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if (index1 < combclass_header_1)
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{
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int lookup1 = u_combclass.level1[index1];
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if (lookup1 >= 0)
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{
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unsigned int index2 = (uc >> combclass_header_2) & combclass_header_3;
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int lookup2 = u_combclass.level2[lookup1 + index2];
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if (lookup2 >= 0)
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{
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unsigned int index3 = (uc & combclass_header_4);
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unsigned int lookup3 = u_combclass.level3[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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