1 /* Combining classes of 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: you can redistribute it and/or modify 6 it under the terms of the GNU Lesser General Public License as 7 published by the Free Software Foundation; either version 2.1 of the 8 License, or (at your option) any later version. 9 10 This file is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public License 16 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 17 18 #include <config.h> 19 20 /* Specification. */ 21 #include "unictype.h" 22 23 /* Define u_combclass table. */ 24 #include "combiningclass.h" 25 26 int 27 uc_combining_class (ucs4_t uc) /* */ 28 { 29 unsigned int index1 = uc >> combclass_header_0; 30 if (index1 < combclass_header_1) 31 { 32 int lookup1 = u_combclass.level1[index1]; 33 if (lookup1 >= 0) 34 { 35 unsigned int index2 = (uc >> combclass_header_2) & combclass_header_3; 36 int lookup2 = u_combclass.level2[lookup1 + index2]; 37 if (lookup2 >= 0) 38 { 39 unsigned int index3 = (uc & combclass_header_4); 40 unsigned int lookup3 = u_combclass.level3[lookup2 + index3]; 41 42 return lookup3; 43 } 44 } 45 } 46 return 0; 47 }