New module 'uniwidth/u32-width'.

[gnulib.git] / lib / uniwidth / u32-width.c

diff --git a/lib/uniwidth/u32-width.c b/lib/uniwidth/u32-width.c
new file mode 100644 (file)
index 0000000..3d93765
--- /dev/null
+++ b/lib/uniwidth/u32-width.c
@@ -0,0 +1,45 @@
+/* Determine display width of UTF-32 string.
+   Copyright (C) 2001-2002, 2006 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"
+
+int
+u32_width (const uint32_t *s, size_t n, const char *encoding)
+{
+  const uint32_t *s_end = s + n;
+  int width = 0;
+
+  while (s < s_end)
+    {
+      ucs4_t uc = *s++;
+      int w;
+
+      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;
+}