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mod c {
pub use libc::{c_int, c_ushort, c_ulong, STDOUT_FILENO};
use std::mem::zeroed;
// Getting the terminal size is done using an ioctl command that
// takes the file handle to the terminal (which in our case is
// stdout), and populates a structure with the values.
pub struct Winsize {
pub ws_row: c_ushort,
pub ws_col: c_ushort,
}
// Unfortunately the actual command is not standardised...
#[cfg(any(target_os = "linux", target_os = "android"))]
static TIOCGWINSZ: c_ulong = 0x5413;
#[cfg(any(target_os = "macos", target_os = "ios"))]
static TIOCGWINSZ: c_ulong = 0x40087468;
extern {
pub fn ioctl(fd: c_int, request: c_ulong, ...) -> c_int;
}
pub unsafe fn dimensions() -> Winsize {
let mut window: Winsize = zeroed();
ioctl(STDOUT_FILENO, TIOCGWINSZ, &mut window as *mut Winsize);
window
}
}
/// Query the current processes's output, returning its width and height as a
/// number of characters. Returns None if the output isn't to a terminal.
pub fn dimensions() -> Option<(usize, usize)> {
let w = unsafe { c::dimensions() };
if w.ws_col == 0 || w.ws_row == 0 {
None
}
else {
Some((w.ws_col as usize, w.ws_row as usize))
}
}
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