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https://github.com/LadybirdBrowser/ladybird.git
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ae6bdc4e29
This commit cleans up some of the `#ifdef`-ed code smell in `Terminal`, by extending the scroll APIs to take a range of lines as a parameter. This makes it possible to use the same code for `IL`/`DL` as for scrolling. Note that the current scrolling implementation is very naive, and does many insertions/deletions in the middle of arrays, whereas swaps should be enough. This optimization will come in a later commit. The `linefeed` override was removed from `VirtualConsole`. Previously, it exhibited incorrect behavior by moving to column 0. Now that we use the method defined in `Terminal`, code which relied on this behavior stopped working. We go instead go through the TTY layer which handles the various output flags. Passing the input character-by-character seems a bit excessive, so a fix for it will come in another PR.
101 lines
2.9 KiB
C++
101 lines
2.9 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/CircularDeque.h>
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#include <AK/WeakPtr.h>
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#include <Kernel/Devices/CharacterDevice.h>
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#include <Kernel/DoubleBuffer.h>
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#include <Kernel/ProcessGroup.h>
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#include <Kernel/UnixTypes.h>
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#define TTY_BUFFER_SIZE 1024
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namespace Kernel {
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class TTY : public CharacterDevice {
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public:
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virtual ~TTY() override;
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virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
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virtual bool can_read(const FileDescription&, size_t) const override;
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virtual bool can_write(const FileDescription&, size_t) const override;
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virtual int ioctl(FileDescription&, unsigned request, FlatPtr arg) override final;
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virtual String absolute_path(const FileDescription&) const override { return tty_name(); }
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virtual String const& tty_name() const = 0;
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unsigned short rows() const { return m_rows; }
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unsigned short columns() const { return m_columns; }
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ProcessGroupID pgid() const
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{
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if (auto pg = m_pg.strong_ref())
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return pg->pgid();
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return 0;
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}
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int set_termios(const termios&);
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bool should_generate_signals() const { return m_termios.c_lflag & ISIG; }
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bool should_flush_on_signal() const { return !(m_termios.c_lflag & NOFLSH); }
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bool should_echo_input() const { return m_termios.c_lflag & ECHO; }
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bool in_canonical_mode() const { return m_termios.c_lflag & ICANON; }
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void set_default_termios();
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void hang_up();
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// ^Device
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virtual mode_t required_mode() const override { return 0620; }
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protected:
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virtual ssize_t on_tty_write(const UserOrKernelBuffer&, ssize_t) = 0;
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void set_size(unsigned short columns, unsigned short rows);
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TTY(unsigned major, unsigned minor);
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void emit(u8, bool do_evaluate_block_conditions = false);
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void echo_with_processing(u8);
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bool can_do_backspace() const;
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void do_backspace();
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void erase_word();
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void erase_character();
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void kill_line();
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void flush_input();
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bool is_eol(u8) const;
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bool is_eof(u8) const;
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bool is_kill(u8) const;
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bool is_erase(u8) const;
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bool is_werase(u8) const;
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void generate_signal(int signal);
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int m_available_lines { 0 };
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private:
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// ^CharacterDevice
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virtual bool is_tty() const final override { return true; }
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virtual void echo(u8) = 0;
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template<typename Functor>
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void process_output(u8, Functor put_char);
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CircularDeque<u8, TTY_BUFFER_SIZE> m_input_buffer;
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// FIXME: use something like AK::Bitmap but which takes a size template parameter
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u8 m_special_character_bitmask[TTY_BUFFER_SIZE / 8];
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WeakPtr<Process> m_original_process_parent;
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WeakPtr<ProcessGroup> m_pg;
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termios m_termios;
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unsigned short m_rows { 0 };
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unsigned short m_columns { 0 };
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};
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}
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