diff options
Diffstat (limited to 'lib/unictype/mirror.c')
-rw-r--r-- | lib/unictype/mirror.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/lib/unictype/mirror.c b/lib/unictype/mirror.c new file mode 100644 index 0000000..7577544 --- /dev/null +++ b/lib/unictype/mirror.c @@ -0,0 +1,49 @@ +/* Mirrored Unicode characters. + Copyright (C) 2002, 2006 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_mirror table. */ +#include "mirror.h" + +bool +uc_mirror_char (ucs4_t uc, ucs4_t *puc) +{ + unsigned int index1 = uc >> mirror_header_0; + if (index1 < mirror_header_1) + { + int lookup1 = u_mirror.level1[index1]; + if (lookup1 >= 0) + { + unsigned int index2 = (uc >> mirror_header_2) & mirror_header_3; + int lookup2 = u_mirror.level2[lookup1 + index2]; + if (lookup2 >= 0) + { + unsigned int index3 = (uc & mirror_header_4); + int lookup3 = u_mirror.level3[lookup2 + index3]; + + *puc = uc + lookup3; + return (lookup3 != 0); + } + } + } + *puc = uc; + return false; +} |