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#pragma once
#include <VirtualFileSystem/CharacterDevice.h>
#include <VirtualFileSystem/UnixTypes.h>
class Process;
class DoubleBuffer {
public:
DoubleBuffer()
: m_write_buffer(&m_buffer1)
, m_read_buffer(&m_buffer2)
{
}
ssize_t write(const byte*, size_t);
ssize_t read(byte*, size_t);
bool is_empty() const { return m_read_buffer_index >= m_read_buffer->size() && m_write_buffer->isEmpty(); }
private:
void flip();
Vector<byte>* m_write_buffer { nullptr };
Vector<byte>* m_read_buffer { nullptr };
Vector<byte> m_buffer1;
Vector<byte> m_buffer2;
size_t m_read_buffer_index { 0 };
};
class TTY : public CharacterDevice {
public:
virtual ~TTY() override;
virtual ssize_t read(byte*, size_t) override;
virtual ssize_t write(const byte*, size_t) override;
virtual bool has_data_available_for_reading() const override;
virtual int ioctl(Process&, unsigned request, unsigned arg) override final;
virtual String tty_name() const = 0;
unsigned short rows() const { return m_rows; }
unsigned short columns() const { return m_columns; }
void set_pgid(pid_t pgid) { m_pgid = pgid; }
pid_t pgid() const { return m_pgid; }
const Unix::termios& termios() const { return m_termios; }
void set_termios(const Unix::termios&);
bool should_generate_signals() const { return m_termios.c_lflag & ISIG; }
bool should_echo_input() const { return m_termios.c_lflag & ECHO; }
bool in_canonical_mode() const { return m_termios.c_lflag & ICANON; }
protected:
virtual void on_tty_write(const byte*, size_t) = 0;
void set_size(unsigned short columns, unsigned short rows);
TTY(unsigned major, unsigned minor);
void emit(byte);
private:
// ^CharacterDevice
virtual bool is_tty() const final override { return true; }
void generate_signal(int signal);
DoubleBuffer m_buffer;
pid_t m_pgid { 0 };
Unix::termios m_termios;
unsigned short m_rows { 0 };
unsigned short m_columns { 0 };
};
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