1 files changed, 52 insertions, 0 deletions
diff --git a/lib/unictype/joininggroup_of.c b/lib/unictype/joininggroup_of.c
new file mode 100644
index 0000000..1626231
--- /dev/null
+++ b/lib/unictype/joininggroup_of.c
@@ -0,0 +1,52 @@
+/* Arabic joining group of Unicode characters.
+   Copyright (C) 2011-2015 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2011.
+
+   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_joining_group table.  */
+#include "joininggroup_of.h"
+
+int
+uc_joining_group (ucs4_t uc)
+{
+  unsigned int index1 = uc >> joining_group_header_0;
+  if (index1 < joining_group_header_1)
+    {
+      int lookup1 = u_joining_group.level1[index1];
+      if (lookup1 >= 0)
+        {
+          unsigned int index2 = (uc >> joining_group_header_2) & joining_group_header_3;
+          int lookup2 = u_joining_group.level2[lookup1 + index2];
+          if (lookup2 >= 0)
+            {
+              unsigned int index3 = ((uc & joining_group_header_4) + lookup2) * 7;
+              /* level3 contains 7-bit values, packed into 16-bit words.  */
+              unsigned int lookup3 =
+                ((u_joining_group.level3[index3>>4]
+                  | ((unsigned int) u_joining_group.level3[(index3>>4)+1] << 16))
+                 >> (index3 % 16))
+                & 0x7f;
+
+              return lookup3;
+            }
+        }
+    }
+  return UC_JOINING_GROUP_NONE;
+}