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-rw-r--r--lib/unicase/simple-mapping.h39
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diff --git a/lib/unicase/simple-mapping.h b/lib/unicase/simple-mapping.h
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+/* Simple case mapping for Unicode characters.
+ Copyright (C) 2002, 2006, 2009 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 2009.
+
+ 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/>. */
+
+ucs4_t
+FUNC (ucs4_t uc)
+{
+ unsigned int index1 = uc >> mapping_header_0;
+ if (index1 < mapping_header_1)
+ {
+ int lookup1 = u_mapping.level1[index1];
+ if (lookup1 >= 0)
+ {
+ unsigned int index2 = (uc >> mapping_header_2) & mapping_header_3;
+ int lookup2 = u_mapping.level2[lookup1 + index2];
+ if (lookup2 >= 0)
+ {
+ unsigned int index3 = (uc & mapping_header_4);
+ int lookup3 = u_mapping.level3[lookup2 + index3];
+
+ return uc + lookup3;
+ }
+ }
+ }
+ return uc;
+}