root/maint/gnulib/lib/unictype/combiningclass.c

/* */

DEFINITIONS

1. uc_combining_class

   1 /* Combining classes of Unicode characters.
   2    Copyright (C) 2002, 2006, 2009-2021 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2002.
   4 
   5    This file is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9 
  10    This file 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
  13    GNU 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 <https://www.gnu.org/licenses/>.  */
  17 
  18 #include <config.h>
  19 
  20 /* Specification.  */
  21 #include "unictype.h"
  22 
  23 /* Define u_combclass table.  */
  24 #include "combiningclass.h"
  25 
  26 int
  27 uc_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 }

/* */