From 0557d46fc22078950c30e64bcb3a65500037c39b Mon Sep 17 00:00:00 2001
From: "David A. Mellis" <d.mellis@arduino.cc>
Date: Fri, 28 May 2010 22:41:03 +0000
Subject: [PATCH] Adding a basic Stream interface and modifying HardwareSerial
 to inherit from it.

---
 .../arduino/cores/arduino/HardwareSerial.h    | 10 +++---
 hardware/arduino/cores/arduino/Stream.h       | 34 +++++++++++++++++++
 2 files changed, 39 insertions(+), 5 deletions(-)
 create mode 100644 hardware/arduino/cores/arduino/Stream.h

diff --git a/hardware/arduino/cores/arduino/HardwareSerial.h b/hardware/arduino/cores/arduino/HardwareSerial.h
index 6b620ed78..cae1447a0 100755
--- a/hardware/arduino/cores/arduino/HardwareSerial.h
+++ b/hardware/arduino/cores/arduino/HardwareSerial.h
@@ -22,11 +22,11 @@
 
 #include <inttypes.h>
 
-#include "Print.h"
+#include "Stream.h"
 
 struct ring_buffer;
 
-class HardwareSerial : public Print
+class HardwareSerial : public Stream
 {
   private:
     ring_buffer *_rx_buffer;
@@ -48,9 +48,9 @@ class HardwareSerial : public Print
       uint8_t rxen, uint8_t txen, uint8_t rxcie, uint8_t udre, uint8_t u2x);
     void begin(long);
     void end();
-    uint8_t available(void);
-    int read(void);
-    void flush(void);
+    virtual uint8_t available(void);
+    virtual int read(void);
+    virtual void flush(void);
     virtual void write(uint8_t);
     using Print::write; // pull in write(str) and write(buf, size) from Print
 };
diff --git a/hardware/arduino/cores/arduino/Stream.h b/hardware/arduino/cores/arduino/Stream.h
new file mode 100644
index 000000000..3bf5283da
--- /dev/null
+++ b/hardware/arduino/cores/arduino/Stream.h
@@ -0,0 +1,34 @@
+/*
+  Stream.h - base class for character-based streams.
+  Copyright (c) 2010 David A. Mellis.  All right reserved.
+
+  This library 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 2.1 of the License, or (at your option) any later version.
+
+  This library 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 library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef Stream_h
+#define Stream_h
+
+#include <inttypes.h>
+#include "Print.h"
+
+class Stream : public Print
+{
+  public:
+    virtual uint8_t available() = 0;
+    virtual int read() = 0;
+    virtual void flush() = 0;
+};
+
+#endif