1 files changed, 58 insertions, 0 deletions
diff --git a/lib/unistr/u16-uctomb-aux.c b/lib/unistr/u16-uctomb-aux.c
new file mode 100644
index 00000000..384452ba
--- /dev/null
+++ b/lib/unistr/u16-uctomb-aux.c
@@ -0,0 +1,58 @@
+/* Conversion UCS-4 to UTF-16.
+   Copyright (C) 2002, 2006-2007 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 "unistr.h"
+
+int
+u16_uctomb_aux (uint16_t *s, ucs4_t uc, int n)
+{
+  if (uc < 0xd800)
+    {
+      /* The case n >= 1 is already handled by the caller.  */
+    }
+  else if (uc < 0x10000)
+    {
+      if (uc >= 0xe000)
+	{
+	  if (n >= 1)
+	    {
+	      s[0] = uc;
+	      return 1;
+	    }
+	}
+      else
+	return -1;
+    }
+  else
+    {
+      if (uc < 0x110000)
+	{
+	  if (n >= 2)
+	    {
+	      s[0] = 0xd800 + ((uc - 0x10000) >> 10);
+	      s[1] = 0xdc00 + ((uc - 0x10000) & 0x3ff);
+	      return 2;
+	    }
+	}
+      else
+	return -1;
+    }
+  return -2;
+}