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diff --git a/ucoo/intf/lcd.cc b/ucoo/intf/lcd.cc
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+// ucoolib - Microcontroller object oriented library. {{{
+//
+// Copyright (C) 2015 Nicolas Schodet
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+//
+// }}}
+#include "lcd.hh"
+#include <cstdio>
+#include <cstdarg>
+
+namespace ucoo {
+
+/// Helper for formated output.
+void
+Lcd::printf (const char *fmt, ...)
+{
+ // Buffer needs extra bytes for '\0' & '\n'.
+ va_list ap;
+ va_start (ap, fmt);
+ char buf[get_lines() * (get_columns() + 1) + 1];
+ vsnprintf (buf, sizeof (buf), fmt, ap);
+ buf[sizeof (buf) - 1] = '\0';
+ va_end (ap);
+ puts (buf);
+}
+
+} // namespace ucoo