lib/unictype/numeric.c

   1 /* Values of numeric Unicode characters.
   2    Copyright (C) 2002, 2006-2007, 2009-2024 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2002.
   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_numeric_values and u_numeric tables.  */
  32 #include "numeric.h"
  33
  34 uc_fraction_t
  35 uc_numeric_value (ucs4_t uc)
  36 {
  37   unsigned int index1 = uc >> numeric_header_0;
  38   if (index1 < numeric_header_1)
  39     {
  40       int lookup1 = u_numeric.level1[index1];
  41       if (lookup1 >= 0)
  42         {
  43           unsigned int index2 = (uc >> numeric_header_2) & numeric_header_3;
  44           int lookup2 = u_numeric.level2[lookup1 + index2];
  45           if (lookup2 >= 0)
  46             {
  47               unsigned int index3 = ((uc & numeric_header_4) + lookup2) * 8;
  48               /* level3 contains 8-bit values, packed into 16-bit words.  */
  49               unsigned int lookup3 =
  50                 (((unsigned int) u_numeric.level3[index3>>4]
  51                   | ((unsigned int) u_numeric.level3[(index3>>4)+1] << 16))
  52                  >> (index3 % 16))
  53                 & 0xff;
  54
  55               return u_numeric_values[lookup3];
  56             }
  57         }
  58     }
  59   {
  60     const uc_fraction_t default_value = { 0, 0 };
  61     return default_value;
  62   }
  63 }