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TTY: Implement Canonical mode and basic echoing.

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The TTY driver now respects the ICANON flag, enabling basic line
editing like VKILL, VERASE, VEOF and VWERASE. Additionally,
ICANON is now set by default.

Basic echoing has can now be enabled via the ECHO flag, though
more complicated echoing like ECHOCTL or ECHONL has not been
implemented.
This commit is contained in:
Drew Stratford 2019-10-20 19:12:00 +13:00 • committed by Andreas Kling
parent 67041f3a8c
commit 4c35c8d7fd
5 changed files with 148 additions and 4 deletions
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18
Kernel/TTY/TTY.h
View file

@ -1,7 +1,7 @@
#pragma once
#include "DoubleBuffer.h"
#include <AK/CircularQueue.h>
#include <AK/CircularDeque.h>
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/UnixTypes.h>
@ -40,14 +40,28 @@ protected:
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();
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; }
CircularQueue<u8, 1024> m_input_buffer;
CircularDeque<u8, 1024> m_input_buffer;
pid_t m_pgid { 0 };
termios m_termios;
unsigned short m_rows { 0 };