genode/repos/os/include/terminal/read_buffer.h

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/*
* \brief Buffer for storing decoded characters
* \author Norman Feske
* \date 2011-06-06
*/
/*
* Copyright (C) 2011-2019 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
#ifndef _TERMINAL__READ_BUFFER_H_
#define _TERMINAL__READ_BUFFER_H_
#include <os/ring_buffer.h>
#include <util/utf8.h>
#include <base/signal.h>
namespace Terminal {
class Read_buffer;
enum { READ_BUFFER_SIZE = 4096 };
}
class Terminal::Read_buffer : public Genode::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)
{
Genode::Ring_buffer<unsigned char, READ_BUFFER_SIZE>::add(c);
if (_sigh_cap.valid())
Genode::Signal_transmitter(_sigh_cap).submit();
}
void add(Codepoint code)
{
/* send Unicode in a burst of UTF-8 */
Genode::String<5> utf8(code);
char const *str = utf8.string();
while (*str)
Genode::Ring_buffer<unsigned char, READ_BUFFER_SIZE>::add(*str++);
if (_sigh_cap.valid())
Genode::Signal_transmitter(_sigh_cap).submit();
}
void add(char const *str)
{
while (*str)
add(*str++);
}
};
#endif /* _TERMINAL__READ_BUFFER_H_ */