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/*
* meli
*
* Copyright 2017-2020 Manos Pitsidianakis
*
* This file is part of meli.
*
* meli is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* meli is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with meli. If not, see <http://www.gnu.org/licenses/>.
*/
use crate::split_command;
use crate::terminal::position::*;
use melib::log;
use melib::ERROR;
use nix::fcntl::{open, OFlag};
use nix::libc::{STDERR_FILENO, STDIN_FILENO, STDOUT_FILENO};
use nix::pty::{grantpt, posix_openpt, ptsname, unlockpt, Winsize};
use nix::sys::stat;
use nix::unistd::{dup2, fork, ForkResult};
use nix::{ioctl_none_bad, ioctl_write_ptr_bad};
use std::ffi::CString;
use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd};
mod grid;
pub use grid::EmbedGrid;
// ioctl request code to "Make the given terminal the controlling terminal of the calling process"
use libc::TIOCSCTTY;
// ioctl request code to set window size of pty:
use libc::TIOCSWINSZ;
use std::path::Path;
use std::convert::TryFrom;
use std::io::Read;
use std::io::Write;
use std::sync::{Arc, Mutex};
// Macro generated function that calls ioctl to set window size of slave pty end
ioctl_write_ptr_bad!(set_window_size, TIOCSWINSZ, Winsize);
ioctl_none_bad!(set_controlling_terminal, TIOCSCTTY);
pub fn create_pty(
width: usize,
height: usize,
command: String,
) -> nix::Result<Arc<Mutex<EmbedGrid>>> {
// Open a new PTY master
let master_fd = posix_openpt(OFlag::O_RDWR)?;
// Allow a slave to be generated for it
grantpt(&master_fd)?;
unlockpt(&master_fd)?;
// Get the name of the slave
let slave_name = unsafe { ptsname(&master_fd) }?;
// Try to open the slave
//let _slave_fd = open(Path::new(&slave_name), OFlag::O_RDWR, Mode::empty())?;
{
let winsize = Winsize {
ws_row: <u16>::try_from(height).unwrap(),
ws_col: <u16>::try_from(width).unwrap(),
ws_xpixel: 0,
ws_ypixel: 0,
};
let master_fd = master_fd.clone().into_raw_fd();
unsafe { set_window_size(master_fd, &winsize).unwrap() };
}
let child_pid = match fork() {
Ok(ForkResult::Child) => {
/* Open slave end for pseudoterminal */
let slave_fd = open(Path::new(&slave_name), OFlag::O_RDWR, stat::Mode::empty())?;
// assign stdin, stdout, stderr to the tty
dup2(slave_fd, STDIN_FILENO).unwrap();
dup2(slave_fd, STDOUT_FILENO).unwrap();
dup2(slave_fd, STDERR_FILENO).unwrap();
/* Become session leader */
nix::unistd::setsid().unwrap();
match unsafe { set_controlling_terminal(slave_fd) } {
Ok(c) if c < 0 => {
log(
format!(
"Could not execute `{}`: ioctl(fd, TIOCSCTTY, NULL) returned {}",
command, c,
),
ERROR,
);
std::process::exit(c);
}
Ok(_) => {}
Err(err) => {
log(
format!(
"Could not execute `{}`: ioctl(fd, TIOCSCTTY, NULL) returned {}",
command, err,
),
ERROR,
);
std::process::exit(-1);
}
}
let parts = split_command!(command);
let (cmd, _) = (parts[0], &parts[1..]);
let _parts = parts
.iter()
.map(|&a| CString::new(a).unwrap())
.collect::<Vec<CString>>();
if let Err(e) = nix::unistd::execv(
&CString::new(cmd).unwrap(),
_parts
.iter()
.map(|a| a.as_c_str())
.collect::<Vec<&_>>()
.as_slice(),
) {
log(format!("Could not execute `{}`: {}", command, e,), ERROR);
std::process::exit(-1);
}
/* This path shouldn't be executed. */
std::process::exit(-1);
}
Ok(ForkResult::Parent { child }) => child,
Err(e) => panic!(e),
};
let stdin = unsafe { std::fs::File::from_raw_fd(master_fd.clone().into_raw_fd()) };
let mut embed_grid = EmbedGrid::new(stdin, child_pid);
embed_grid.set_terminal_size((width, height));
let grid = Arc::new(Mutex::new(embed_grid));
let grid_ = grid.clone();
std::thread::Builder::new()
.spawn(move || {
let master_fd = master_fd.into_raw_fd();
let master_file = unsafe { std::fs::File::from_raw_fd(master_fd) };
forward_pty_translate_escape_codes(master_file, grid_);
})
.unwrap();
Ok(grid)
}
fn forward_pty_translate_escape_codes(pty_fd: std::fs::File, grid: Arc<Mutex<EmbedGrid>>) {
let mut bytes_iter = pty_fd.bytes();
debug!("waiting for bytes");
while let Some(Ok(byte)) = bytes_iter.next() {
debug!("got a byte? {:?}", byte as char);
/* Drink deep, and descend. */
grid.lock().unwrap().process_byte(byte);
}
}
#[derive(Debug)]
pub enum State {
ExpectingControlChar,
G0, // Designate G0 Character Set
Osc1(Vec<u8>), //ESC ] Operating System Command (OSC is 0x9d).
Osc2(Vec<u8>, Vec<u8>),
Csi, // ESC [ Control Sequence Introducer (CSI is 0x9b).
Csi1(Vec<u8>),
Csi2(Vec<u8>, Vec<u8>),
Csi3(Vec<u8>, Vec<u8>, Vec<u8>),
CsiQ(Vec<u8>),
Normal,
}
/* Used for debugging */
struct EscCode<'a>(&'a State, u8);
impl<'a> From<(&'a mut State, u8)> for EscCode<'a> {
fn from(val: (&mut State, u8)) -> EscCode {
let (s, b) = val;
EscCode(s, b)
}
}
impl<'a> From<(&'a State, u8)> for EscCode<'a> {
fn from(val: (&State, u8)) -> EscCode {
let (s, b) = val;
EscCode(s, b)
}
}
impl std::fmt::Display for EscCode<'_> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
use State::*;
macro_rules! unsafestr {
($buf:ident) => {
unsafe { std::str::from_utf8_unchecked($buf) }
};
}
match self {
EscCode(G0, b'B') => write!(f, "ESC(B\t\tG0 USASCII charset set"),
EscCode(G0, c) => write!(f, "ESC({}\t\tG0 charset set", *c as char),
EscCode(Osc1(ref buf), ref c) => {
write!(f, "ESC]{}{}\t\tOSC", unsafestr!(buf), *c as char)
}
EscCode(Osc2(ref buf1, ref buf2), c) => write!(
f,
"ESC]{};{}{}\t\tOSC [UNKNOWN]",
unsafestr!(buf1),
unsafestr!(buf2),
*c as char
),
EscCode(ExpectingControlChar, b'D') => write!(
f, "ESC D Linefeed"
),
EscCode(Csi, b'm') => write!(
f,
"ESC[m\t\tCSI Character Attributes | Set Attr and Color to Normal (default)"
),
EscCode(Csi, b'K') => write!(
f,
"ESC[K\t\tCSI Erase from the cursor to the end of the line"
),
EscCode(Csi, b'L') => write!(
f,
"ESC[L\t\tCSI Insert one blank line"
),
EscCode(Csi, b'M') => write!(
f,
"ESC[M\t\tCSI delete line"
),
EscCode(Csi, b'J') => write!(
f,
"ESC[J\t\tCSI Erase from the cursor to the end of the screen"
),
EscCode(Csi, b'H') => write!(f, "ESC[H\t\tCSI Move the cursor to home position."),
EscCode(Csi, c) => write!(f, "ESC[{}\t\tCSI [UNKNOWN]", *c as char),
EscCode(Csi1(ref buf), b'L') => write!(
f,
"ESC[{}L\t\tCSI Insert {} blank lines",
unsafestr!(buf),
unsafestr!(buf)
),
EscCode(Csi1(ref buf), b'm') => write!(
f,
"ESC[{}m\t\tCSI Character Attributes | Set fg, bg color",
unsafestr!(buf)
),
EscCode(Csi1(ref buf), b'n') => write!(
f,
"ESC[{}n\t\tCSI Device Status Report (DSR)| Report Cursor Position",
unsafestr!(buf)
),
EscCode(Csi1(ref buf), b't') if buf == b"18" => write!(
f,
"ESC[18t\t\tReport the size of the text area in characters",
),
EscCode(Csi1(ref buf), b't') => write!(
f,
"ESC[{buf}t\t\tWindow manipulation, skipped",
buf = unsafestr!(buf)
),
EscCode(Csi1(ref buf), b'B') => write!(
f,
"ESC[{buf}B\t\tCSI Cursor Down {buf} Times",
buf = unsafestr!(buf)
),
EscCode(Csi1(ref buf), b'C') => write!(
f,
"ESC[{buf}C\t\tCSI Cursor Forward {buf} Times",
buf = unsafestr!(buf)
),
EscCode(Csi1(ref buf), b'D') => write!(
f,
"ESC[{buf}D\t\tCSI Cursor Backward {buf} Times",
buf = unsafestr!(buf)
),
EscCode(Csi1(ref buf), b'E') => write!(
f,
"ESC[{buf}E\t\tCSI Cursor Next Line {buf} Times",
buf = unsafestr!(buf)
),
EscCode(Csi1(ref buf), b'F') => write!(
f,
"ESC[{buf}F\t\tCSI Cursor Preceding Line {buf} Times",
buf = unsafestr!(buf)
),
EscCode(Csi1(ref buf), b'G') => write!(
f,
"ESC[{buf}G\t\tCursor Character Absolute [column={buf}] (default = [row,1])",
buf = unsafestr!(buf)
),
EscCode(Csi1(ref buf), b'M') => write!(
f,
"ESC[{buf}M\t\tDelete P s Lines(s) (default = 1) (DCH). ",
buf = unsafestr!(buf)
),
EscCode(Csi1(ref buf), b'P') => write!(
f,
"ESC[{buf}P\t\tDelete P s Character(s) (default = 1) (DCH). ",
buf = unsafestr!(buf)
),
EscCode(Csi1(ref buf), b'S') => write!(
f,
"ESC[{buf}S\t\tCSI P s S Scroll up P s lines (default = 1) (SU), VT420, EC",
buf = unsafestr!(buf)
),
EscCode(Csi1(ref buf), b'J') => write!(
f,
"Erase in display {buf}",
buf = unsafestr!(buf)
),
EscCode(Csi1(ref buf), c) => {
write!(f, "ESC[{}{}\t\tCSI [UNKNOWN]", unsafestr!(buf), *c as char)
}
EscCode(Csi2(ref buf1, ref buf2), b'r') => write!(
f,
"ESC[{};{}r\t\tCSI Set Scrolling Region [top;bottom] (default = full size of window) (DECSTBM), VT100.",
unsafestr!(buf1),
unsafestr!(buf2),
),
EscCode(Csi2(ref buf1, ref buf2), c) => write!(
f,
"ESC[{};{}{}\t\tCSI",
unsafestr!(buf1),
unsafestr!(buf2),
*c as char
),
EscCode(Csi3(ref buf1, ref buf2, ref buf3), b'm') => write!(
f,
"ESC[{};{};{}m\t\tCSI Character Attributes | Set fg, bg color",
unsafestr!(buf1),
unsafestr!(buf2),
unsafestr!(buf3),
),
EscCode(Csi3(ref buf1, ref buf2, ref buf3), c) => write!(
f,
"ESC[{};{};{}{}\t\tCSI [UNKNOWN]",
unsafestr!(buf1),
unsafestr!(buf2),
unsafestr!(buf3),
*c as char
),
EscCode(CsiQ(ref buf), b's') => write!(
f,
"ESC[?{}r\t\tCSI Save DEC Private Mode Values",
unsafestr!(buf)
),
EscCode(CsiQ(ref buf), b'r') => write!(
f,
"ESC[?{}r\t\tCSI Restore DEC Private Mode Values",
unsafestr!(buf)
),
EscCode(CsiQ(ref buf), b'h') if buf == b"25" => write!(
f,
"ESC[?25h\t\tCSI DEC Private Mode Set (DECSET) show cursor",
),
EscCode(CsiQ(ref buf), b'h') if buf == b"12" => write!(
f,
"ESC[?12h\t\tCSI DEC Private Mode Set (DECSET) Start Blinking Cursor.",
),
EscCode(CsiQ(ref buf), b'h') => write!(
f,
"ESC[?{}h\t\tCSI DEC Private Mode Set (DECSET). [UNKNOWN]",
unsafestr!(buf)
),
EscCode(CsiQ(ref buf), b'l') if buf == b"12" => write!(
f,
"ESC[?12l\t\tCSI DEC Private Mode Set (DECSET) Stop Blinking Cursor",
),
EscCode(CsiQ(ref buf), b'l') if buf == b"25" => write!(
f,
"ESC[?25l\t\tCSI DEC Private Mode Set (DECSET) hide cursor",
),
EscCode(CsiQ(ref buf), c) => {
write!(f, "ESC[?{}{}\t\tCSI [UNKNOWN]", unsafestr!(buf), *c as char)
}
EscCode(unknown, c) => {
write!(f, "{:?}{} [UNKNOWN]", unknown, c)
}
}
}
}