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

/* */

DEFINITIONS

1. uc_joining_group

   1 /* Arabic joining group of Unicode characters.
   2    Copyright (C) 2011-2021 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2011.
   4 
   5    This file is free software.
   6    It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
   7    You can redistribute it and/or modify it under either
   8      - the terms of the GNU Lesser General Public License as published
   9        by the Free Software Foundation; either version 3, or (at your
  10        option) any later version, or
  11      - the terms of the GNU General Public License as published by the
  12        Free Software Foundation; either version 2, or (at your option)
  13        any later version, or
  14      - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
  15 
  16    This file is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19    Lesser General Public License and the GNU General Public License
  20    for more details.
  21 
  22    You should have received a copy of the GNU Lesser General Public
  23    License and of the GNU General Public License along with this
  24    program.  If not, see <https://www.gnu.org/licenses/>.  */
  25 
  26 #include <config.h>
  27 
  28 /* Specification.  */
  29 #include "unictype.h"
  30 
  31 /* Define u_joining_group table.  */
  32 #include "joininggroup_of.h"
  33 
  34 int
  35 uc_joining_group (ucs4_t uc)
     /*  */
  36 {
  37   unsigned int index1 = uc >> joining_group_header_0;
  38   if (index1 < joining_group_header_1)
  39     {
  40       int lookup1 = u_joining_group.level1[index1];
  41       if (lookup1 >= 0)
  42         {
  43           unsigned int index2 = (uc >> joining_group_header_2) & joining_group_header_3;
  44           int lookup2 = u_joining_group.level2[lookup1 + index2];
  45           if (lookup2 >= 0)
  46             {
  47               unsigned int index3 = ((uc & joining_group_header_4) + lookup2) * 7;
  48               /* level3 contains 7-bit values, packed into 16-bit words.  */
  49               unsigned int lookup3 =
  50                 (((unsigned int) u_joining_group.level3[index3>>4]
  51                   | ((unsigned int) u_joining_group.level3[(index3>>4)+1] << 16))
  52                  >> (index3 % 16))
  53                 & 0x7f;
  54 
  55               return lookup3;
  56             }
  57         }
  58     }
  59   return UC_JOINING_GROUP_NONE;
  60 }

/* */