New module 'unicase/toupper'.

[gnulib.git] / lib / unicase / simple-mapping.h

diff --git a/lib/unicase/simple-mapping.h b/lib/unicase/simple-mapping.h
new file mode 100644 (file)
index 0000000..44cecc8
--- /dev/null
+++ b/lib/unicase/simple-mapping.h
@@ -0,0 +1,39 @@
+/* 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;
+}