Imported Upstream version 0.9.1upstream/0.9.1

1 files changed, 49 insertions, 0 deletions

diff --git a/lib/unistr/u16-mblen.c b/lib/unistr/u16-mblen.c
new file mode 100644
index 00000000..6bb35ac8
--- /dev/null
+++ b/lib/unistr/u16-mblen.c
@@ -0,0 +1,49 @@
+/* Look at first character in UTF-16 string.
+   Copyright (C) 1999-2000, 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_mblen (const uint16_t *s, size_t n)
+{
+  if (n > 0)
+    {
+      /* Keep in sync with unistr.h and utf16-ucs4.c.  */
+      uint16_t c = *s;
+
+      if (c < 0xd800 || c >= 0xe000)
+	return (c != 0 ? 1 : 0);
+#if CONFIG_UNICODE_SAFETY
+      if (c < 0xdc00)
+	{
+	  if (n >= 2
+	      && s[1] >= 0xdc00 && s[1] < 0xe000)
+	    return 2;
+	}
+#else
+	{
+	  if (n >= 2)
+	    return 2;
+	}
+#endif
+    }
+  /* invalid or incomplete multibyte character */
+  return -1;
+}