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/* Values of decimal digit Unicode characters.
   Copyright (C) 2002, 2006, 2009-2025 Free Software Foundation, Inc.
   Written by Bruno Haible <bruno@clisp.org>, 2002.

   This file is free software.
   It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
   You can redistribute it and/or modify it under either
     - the terms of the GNU Lesser General Public License as published
       by the Free Software Foundation, either version 3, or (at your
       option) any later version, or
     - the terms of the GNU General Public License as published by the
       Free Software Foundation; either version 2, or (at your option)
       any later version, or
     - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".

   This file is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License and the GNU General Public License
   for more details.

   You should have received a copy of the GNU Lesser General Public
   License and of the GNU General Public License along with this
   program.  If not, see <https://www.gnu.org/licenses/>.  */

#include <config.h>

/* Specification.  */
#include "unictype.h"

/* Define u_decdigit table.  */
#include "decdigit.h"

int
uc_decimal_value (ucs4_t uc)
{
  unsigned int index1 = uc >> decdigit_header_0;
  if (index1 < decdigit_header_1)
    {
      int lookup1 = u_decdigit.level1[index1];
      if (lookup1 >= 0)
        {
          unsigned int index2 = (uc >> decdigit_header_2) & decdigit_header_3;
          int lookup2 = u_decdigit.level2[lookup1 + index2];
          if (lookup2 >= 0)
            {
              unsigned int index3 = (uc & decdigit_header_4) + lookup2;
              /* level3 contains 4-bit values.  */
              unsigned int lookup3 =
                (u_decdigit.level3[index3>>1] >> ((index3 % 2) * 4)) & 0x0f;

              return (int) lookup3 - 1;
            }
        }
    }
  return -1;
}
kc3-lang/gnulib/lib/unictype/decdigit.c

Commit

lib/unictype/decdigit.c
