Split terminal implementation into multiple files

The terminal has a lot of bits that may be worth reusing outside the
single implementation. Those bits are now located at 'include/terminal'
in the gems repository.

gems/include/terminal/read_buffer.h

@@ -0,0 +1,100 @@
+/*
+ * \brief  Buffer for storing decoded characters
+ * \author Norman Feske
+ * \date   2011-06-06
+ */
+
+/*
+ * Copyright (C) 2011-2012 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU General Public License version 2.
+ */
+
+#ifndef _TERMINAL__READ_BUFFER_H_
+#define _TERMINAL__READ_BUFFER_H_
+
+#include <os/ring_buffer.h>
+#include <base/signal.h>
+
+
+namespace Terminal {
+
+	class Read_buffer;
+
+	enum { READ_BUFFER_SIZE = 4096 };
+}
+
+
+class Terminal::Read_buffer : public Ring_buffer<unsigned char, READ_BUFFER_SIZE>
+{
+	private:
+
+		Genode::Signal_context_capability _sigh_cap;
+
+	public:
+
+		/**
+		 * Register signal handler for read-avail signals
+		 */
+		void sigh(Genode::Signal_context_capability cap)
+		{
+			_sigh_cap = cap;
+		}
+
+		/**
+		 * Add element into read buffer and emit signal
+		 */
+		void add(unsigned char c)
+		{
+			Ring_buffer<unsigned char, READ_BUFFER_SIZE>::add(c);
+
+			if (_sigh_cap.valid())
+				Genode::Signal_transmitter(_sigh_cap).submit();
+		}
+
+		void add(char const *str)
+		{
+			while (*str)
+				add(*str++);
+		}
+};
+
+
+enum { READ_BUFFER_SIZE = 4096 };
+
+class Read_buffer : public Ring_buffer<unsigned char, READ_BUFFER_SIZE>
+{
+	private:
+
+		Genode::Signal_context_capability _sigh_cap;
+
+	public:
+
+		/**
+		 * Register signal handler for read-avail signals
+		 */
+		void sigh(Genode::Signal_context_capability cap)
+		{
+			_sigh_cap = cap;
+		}
+
+		/**
+		 * Add element into read buffer and emit signal
+		 */
+		void add(unsigned char c)
+		{
+			Ring_buffer<unsigned char, READ_BUFFER_SIZE>::add(c);
+
+			if (_sigh_cap.valid())
+				Genode::Signal_transmitter(_sigh_cap).submit();
+		}
+
+		void add(char const *str)
+		{
+			while (*str)
+				add(*str++);
+		}
+};
+
+#endif /* _TERMINAL__READ_BUFFER_H_ */