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|
//! Line discipline over the PS/2 keyboard — the kernel's tty layer.
//!
//! Two modes, like a real UNIX terminal:
//! - **canonical** (`read_line`): input is echoed, buffered until Enter,
//! ^C cancels the line, ^D on an empty line is EOF.
//! - **raw** (`read_byte` / `try_read_byte`): keys are translated to the
//! classic terminal byte protocol (arrows → `ESC [ A–D`, Backspace →
//! `0x7f`, ^X → `0x18`, …) and delivered one byte at a time, with no echo.
//! Multi-byte sequences are queued internally so `read_byte` returns them
//! in order.
//!
//! `interrupt_pressed` is the cooperative-interrupt check used by streaming
//! commands (cat/hexdump): it drains the keyboard non-blockingly and reports
//! whether ^C was seen.
use crate::ps2::{self, KeyEvent};
use crate::strbuf;
use crate::{gop, serial};
pub const LINE_BUF_SIZE: usize = 256;
/// Result of one canonical line-input session.
pub enum LineInput {
Line(strbuf::String<LINE_BUF_SIZE>),
Interrupted, // ^C
Eof, // ^D on an empty line
}
// Raw-mode byte queue: holds the tail of a multi-byte key sequence.
static mut RAW_QUEUE: [u8; 8] = [0; 8];
static mut RAW_LEN: usize = 0;
// ---------------------------------------------------------------------------
// canonical mode
// ---------------------------------------------------------------------------
/// Read one line in canonical mode: echo every key, ^C cancels the line,
/// ^D on an empty line is EOF. Echo goes to the terminal (GOP) and serial.
pub fn read_line() -> LineInput {
let mut buf = strbuf::String::<LINE_BUF_SIZE>::new();
loop {
match ps2::poll_key() {
KeyEvent::Enter => {
gop::put_char('\n');
serial::write_str("\r\n");
return LineInput::Line(buf);
}
KeyEvent::Ctrl('c') => {
// Cancel the current line — like a real terminal, echo ^C.
buf.clear();
gop::put_char('^');
gop::put_char('C');
gop::put_char('\n');
serial::write_str("^C\r\n");
return LineInput::Interrupted;
}
KeyEvent::Ctrl('d') => {
if buf.is_empty() {
// EOF on an empty line — the caller decides what to do.
gop::put_char('^');
gop::put_char('D');
gop::put_char('\n');
serial::write_str("^D\r\n");
return LineInput::Eof;
}
// ^D with text on the line: ignored (bash semantics).
}
KeyEvent::Char(c) if c.is_ascii_graphic() || c == ' ' => {
if buf.push(c).is_ok() {
gop::put_char(c);
let mut s = [0u8; 4];
let s = c.encode_utf8(&mut s);
serial::write_str(s);
}
}
KeyEvent::Backspace => {
if buf.pop().is_some() {
gop::put_char('\x08');
// Serial backspace: BS SP BS (standard terminal protocol)
serial::write_str("\x08 \x08");
}
}
KeyEvent::Tab => {
for _ in 0..4 {
if buf.push(' ').is_ok() {
gop::put_char(' ');
serial::write_str(" ");
}
}
}
_ => {}
}
}
}
/// Non-blocking drain of the keyboard: true if a ^C is pending. Used by
/// streaming commands (cat/hexdump) so a long dump can be interrupted.
pub fn interrupt_pressed() -> bool {
let mut pressed = false;
while let Some(ev) = ps2::try_poll_key() {
if matches!(ev, KeyEvent::Ctrl('c')) {
pressed = true;
}
}
pressed
}
// ---------------------------------------------------------------------------
// raw mode
// ---------------------------------------------------------------------------
/// Blocking read of the next raw-mode byte. Keys arrive translated to the
/// terminal byte protocol; multi-byte sequences are delivered in order.
pub fn read_byte() -> u8 {
loop {
if let Some(b) = pop_raw() {
return b;
}
let ev = ps2::poll_key();
enqueue_key(ev);
}
}
/// Non-blocking raw read: Some(byte) if one is available, else None.
pub fn try_read_byte() -> Option<u8> {
if let Some(b) = pop_raw() {
return Some(b);
}
match ps2::try_poll_key() {
Some(ev) => {
enqueue_key(ev);
pop_raw()
}
None => None,
}
}
fn pop_raw() -> Option<u8> {
unsafe {
if RAW_LEN == 0 {
return None;
}
let b = RAW_QUEUE[0];
for i in 1..RAW_LEN {
RAW_QUEUE[i - 1] = RAW_QUEUE[i];
}
RAW_LEN -= 1;
Some(b)
}
}
fn enqueue_key(ev: KeyEvent) {
let mut q = [0u8; 8];
let n: usize = match ev {
KeyEvent::Char(c) if c.is_ascii() => {
q[0] = c as u8;
1
}
KeyEvent::Enter => {
q[0] = 0x0d;
1
}
KeyEvent::Backspace => {
q[0] = 0x7f;
1
}
KeyEvent::Tab => {
q[0] = 0x09;
1
}
KeyEvent::Escape => {
q[0] = 0x1b;
1
}
KeyEvent::Ctrl(c) => {
q[0] = (c as u8) & 0x1f;
1
}
KeyEvent::ArrowUp => {
q[..3].copy_from_slice(b"\x1b[A");
3
}
KeyEvent::ArrowDown => {
q[..3].copy_from_slice(b"\x1b[B");
3
}
KeyEvent::ArrowRight => {
q[..3].copy_from_slice(b"\x1b[C");
3
}
KeyEvent::ArrowLeft => {
q[..3].copy_from_slice(b"\x1b[D");
3
}
KeyEvent::CtrlArrow(0) => {
q[..6].copy_from_slice(b"\x1b[1;5A");
6
}
KeyEvent::CtrlArrow(1) => {
q[..6].copy_from_slice(b"\x1b[1;5B");
6
}
KeyEvent::CtrlArrow(2) => {
q[..6].copy_from_slice(b"\x1b[1;5D");
6
}
KeyEvent::CtrlArrow(3) => {
q[..6].copy_from_slice(b"\x1b[1;5C");
6
}
KeyEvent::Home => {
q[..3].copy_from_slice(b"\x1b[H");
3
}
KeyEvent::End => {
q[..3].copy_from_slice(b"\x1b[F");
3
}
KeyEvent::PageUp => {
q[..4].copy_from_slice(b"\x1b[5~");
4
}
KeyEvent::PageDown => {
q[..4].copy_from_slice(b"\x1b[6~");
4
}
KeyEvent::Delete => {
q[..4].copy_from_slice(b"\x1b[3~");
4
}
_ => return,
};
unsafe {
for (i, b) in q.iter().take(n).enumerate() {
RAW_QUEUE[i] = *b;
}
RAW_LEN = n;
}
}
|
