text: /* Values of digit Unicode characters.
     Copyright (C) 2002, 2006, 2009-2012 Free Software Foundation, Inc.
     Written by Bruno Haible <bruno@clisp.org>, 2002.
  
     This program is free software: you can redistribute it and/or modify it
     under the terms of the GNU Lesser General Public License as published
     by the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program 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 for more details.
  
     You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include "unictype.h"
  
  /* Define u_digit table.  */
  #include "digit.h"
  
  int
  uc_digit_value (ucs4_t uc)
  {
    unsigned int index1 = uc >> digit_header_0;
    if (index1 < digit_header_1)
      {
        int lookup1 = u_digit.level1[index1];
        if (lookup1 >= 0)
          {
            unsigned int index2 = (uc >> digit_header_2) & digit_header_3;
            int lookup2 = u_digit.level2[lookup1 + index2];
            if (lookup2 >= 0)
              {
                unsigned int index3 = (uc & digit_header_4) + lookup2;
                /* level3 contains 4-bit values.  */
                unsigned int lookup3 =
                  (u_digit.level3[index3>>1] >> ((index3 % 2) * 4)) & 0x0f;
  
                return (int) lookup3 - 1;
              }
          }
      }
    return -1;
  }
  