From 31380fda6143b0fcb8d5a133a6628e910b96e34d Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Sat, 7 Jul 2007 16:20:40 +0000
Subject: [PATCH] New module 'uniwidth/u16-width'.

---
 ChangeLog                  |  3 +++
 lib/uniwidth/u16-width.c   | 49 ++++++++++++++++++++++++++++++++++++++
 modules/uniwidth/u16-width | 25 +++++++++++++++++++
 3 files changed, 77 insertions(+)
 create mode 100644 lib/uniwidth/u16-width.c
 create mode 100644 modules/uniwidth/u16-width

diff --git a/ChangeLog b/ChangeLog
index 60468c02b4..1d2e5f7778 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2007-07-07  Bruno Haible  <bruno@clisp.org>
 
+	* lib/uniwidth/u16-width.c: New file.
+	* modules/uniwidth/u16-width: New file.
+
 	* tests/uniwidth/test-u8-width.c: New file.
 	* modules/uniwidth/u8-width-tests: New file.
 
diff --git a/lib/uniwidth/u16-width.c b/lib/uniwidth/u16-width.c
new file mode 100644
index 0000000000..09e68740cf
--- /dev/null
+++ b/lib/uniwidth/u16-width.c
@@ -0,0 +1,49 @@
+/* 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 Library General Public License as published
+   by the Free Software Foundation; either version 2, 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+   USA.  */
+
+#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;
+}
diff --git a/modules/uniwidth/u16-width b/modules/uniwidth/u16-width
new file mode 100644
index 0000000000..ae31a3f60d
--- /dev/null
+++ b/modules/uniwidth/u16-width
@@ -0,0 +1,25 @@
+Description:
+Determine display width of UTF-16 string.
+
+Files:
+lib/uniwidth/u16-width.c
+
+Depends-on:
+uniwidth/base
+uniwidth/width
+unistr/u16-mbtouc-unsafe
+
+configure.ac:
+
+Makefile.am:
+lib_SOURCES += uniwidth/u16-width.c
+
+Include:
+"uniwidth.h"
+
+License:
+LGPL
+
+Maintainer:
+Bruno Haible
+
-- 
2.30.2