1 /* Values of decimal digit 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. 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_decdigit table. */ 32 #include "decdigit.h" 33 34 int 35 uc_decimal_value (ucs4_t uc) /* */ 36 { 37 unsigned int index1 = uc >> decdigit_header_0; 38 if (index1 < decdigit_header_1) 39 { 40 int lookup1 = u_decdigit.level1[index1]; 41 if (lookup1 >= 0) 42 { 43 unsigned int index2 = (uc >> decdigit_header_2) & decdigit_header_3; 44 int lookup2 = u_decdigit.level2[lookup1 + index2]; 45 if (lookup2 >= 0) 46 { 47 unsigned int index3 = (uc & decdigit_header_4) + lookup2; 48 /* level3 contains 4-bit values. */ 49 unsigned int lookup3 = 50 (u_decdigit.level3[index3>>1] >> ((index3 % 2) * 4)) & 0x0f; 51 52 return (int) lookup3 - 1; 53 } 54 } 55 } 56 return -1; 57 }