1 files changed, 47 insertions, 0 deletions
diff --git a/lib/uniwidth/u16-width.c b/lib/uniwidth/u16-width.c
new file mode 100644
index 00000000..b866b3c9
--- /dev/null
+++ b/lib/uniwidth/u16-width.c
@@ -0,0 +1,47 @@
+/* Determine display width of UTF-16 string.
+   Copyright (C) 2001-2002, 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 "uniwidth.h"
+
+#include "unistr.h"
+
+int
+u16_width (const uint16_t *s, size_t n, const char *encoding)
+{
+  const uint16_t *s_end = s + n;
+  int width = 0;
+
+  while (s < s_end)
+    {
+      ucs4_t uc;
+      int w;
+
+      s += u16_mbtouc_unsafe (&uc, s, s_end - s);
+
+      if (uc == 0)
+	break; /* end of string reached */
+
+      w = uc_width (uc, encoding);
+      if (w >= 0) /* ignore control characters in the string */
+	width += w;
+    }
+
+  return width;
+}