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#pragma once
#include "DoubleBuffer.h"
#include <AK/CircularDeque.h>
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/UnixTypes.h>
class Process;
class TTY : public CharacterDevice {
public:
virtual ~TTY() override;
virtual ssize_t read(FileDescription&, u8*, ssize_t) override;
virtual ssize_t write(FileDescription&, const u8*, ssize_t) override;
virtual bool can_read(const FileDescription&) const override;
virtual bool can_write(const FileDescription&) const override;
virtual int ioctl(FileDescription&, unsigned request, unsigned arg) override final;
virtual String absolute_path(const FileDescription&) const override { return tty_name(); }
virtual StringView 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; }
void set_termios(const termios&);
bool should_generate_signals() const { return m_termios.c_lflag & ISIG; }
bool should_flush_on_signal() const { return !(m_termios.c_lflag & NOFLSH); }
bool should_echo_input() const { return m_termios.c_lflag & ECHO; }
bool in_canonical_mode() const { return m_termios.c_lflag & ICANON; }
void set_default_termios();
void hang_up();
protected:
virtual ssize_t on_tty_write(const u8*, ssize_t) = 0;
void set_size(unsigned short columns, unsigned short rows);
TTY(unsigned major, unsigned minor);
void emit(u8);
virtual void echo(u8) = 0;
bool can_do_backspace() const;
void do_backspace();
void erase_word();
void kill_line();
void flush_input();
bool is_eol(u8) const;
bool is_eof(u8) const;
bool is_kill(u8) const;
bool is_erase(u8) const;
bool is_werase(u8) const;
void generate_signal(int signal);
int m_available_lines { 0 };
private:
// ^CharacterDevice
virtual bool is_tty() const final override { return true; }
CircularDeque<u8, 1024> m_input_buffer;
pid_t m_pgid { 0 };
termios m_termios;
unsigned short m_rows { 0 };
unsigned short m_columns { 0 };
};
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