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read only one byte in read_single_key unless we find an escape sequence #62

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merged 2 commits into from
May 8, 2020
Merged

read only one byte in read_single_key unless we find an escape sequence #62

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32fb913
read only 1 byte unless we find an ESC sequence
May 7, 2020
a63ece3
unicode support
May 8, 2020
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54 changes: 53 additions & 1 deletion src/unix_term.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -85,9 +85,61 @@ pub fn read_single_key() -> io::Result<Key> {
termios::cfmakeraw(&mut termios);
termios::tcsetattr(fd, termios::TCSADRAIN, &termios)?;
let rv = unsafe {
let read = libc::read(fd, buf.as_mut_ptr() as *mut libc::c_void, 20);
let read = libc::read(fd, buf.as_mut_ptr() as *mut libc::c_void, 1);
if read < 0 {
Err(io::Error::last_os_error())
} else if buf[0] == b'\x1b' {
// read 19 more bytes if the first byte was the ESC code
let read = libc::read(fd, buf[1..].as_mut_ptr() as *mut libc::c_void, 19);
if read < 0 {
Err(io::Error::last_os_error())
} else if buf[1] == b'\x03' {
Err(io::Error::new(
io::ErrorKind::Interrupted,
"read interrupted",
))
} else {
Ok(key_from_escape_codes(&buf[..(read+1) as usize]))
}
} else if buf[0] & 224u8 == 192u8 {
// a two byte unicode character
let read = libc::read(fd, buf[1..].as_mut_ptr() as *mut libc::c_void, 1);
if read < 0 {
Err(io::Error::last_os_error())
} else if buf[1] == b'\x03' {
Err(io::Error::new(
io::ErrorKind::Interrupted,
"read interrupted",
))
} else {
Ok(key_from_escape_codes(&buf[..2 as usize]))
}
} else if buf[0] & 240u8 == 224u8 {
// a three byte unicode character
let read = libc::read(fd, buf[1..].as_mut_ptr() as *mut libc::c_void, 2);
if read < 0 {
Err(io::Error::last_os_error())
} else if buf[1] == b'\x03' {
Err(io::Error::new(
io::ErrorKind::Interrupted,
"read interrupted",
))
} else {
Ok(key_from_escape_codes(&buf[..3 as usize]))
}
} else if buf[0] & 248u8 == 240u8 {
// a four byte unicode character
let read = libc::read(fd, buf[1..].as_mut_ptr() as *mut libc::c_void, 3);
if read < 0 {
Err(io::Error::last_os_error())
} else if buf[1] == b'\x03' {
Err(io::Error::new(
io::ErrorKind::Interrupted,
"read interrupted",
))
} else {
Ok(key_from_escape_codes(&buf[..4 as usize]))
}
} else if buf[0] == b'\x03' {
Err(io::Error::new(
io::ErrorKind::Interrupted,
Expand Down