1/* Combining classes of Unicode characters.
2   Copyright (C) 2002, 2006, 2009-2010 Free Software Foundation, Inc.
3   Written by Bruno Haible <bruno@clisp.org>, 2002.
4
5   This program is free software: you can redistribute it and/or modify it
6   under the terms of the GNU Lesser General Public License as published
7   by the Free Software Foundation; either version 3 of the License, or
8   (at your option) any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public License
16   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
17
18#include <config.h>
19
20/* Specification.  */
21#include "unictype.h"
22
23/* Define u_combclass table.  */
24#include "combining.h"
25
26int
27uc_combining_class (ucs4_t uc)
28{
29  unsigned int index1 = uc >> combclass_header_0;
30  if (index1 < combclass_header_1)
31    {
32      int lookup1 = u_combclass.level1[index1];
33      if (lookup1 >= 0)
34        {
35          unsigned int index2 = (uc >> combclass_header_2) & combclass_header_3;
36          int lookup2 = u_combclass.level2[lookup1 + index2];
37          if (lookup2 >= 0)
38            {
39              unsigned int index3 = (uc & combclass_header_4);
40              unsigned int lookup3 = u_combclass.level3[lookup2 + index3];
41
42              return lookup3;
43            }
44        }
45    }
46  return 0;
47}
48