termion/src/size.rs

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Rust
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#[cfg(not(target_os = "redox"))]
use libc::c_ushort;
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use TerminalError;
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#[cfg(not(target_os = "redox"))]
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#[repr(C)]
struct TermSize {
row: c_ushort,
col: c_ushort,
_x: c_ushort,
_y: c_ushort,
}
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// Since attributes on non-item statements is not stable yet, we use a function.
#[cfg(target_pointer_width = "64")]
fn tiocgwinsz() -> u64 {
use termios::TIOCGWINSZ;
TIOCGWINSZ as u64
}
#[cfg(target_pointer_width = "32")]
fn tiocgwinsz() -> u32 {
use termios::TIOCGWINSZ;
TIOCGWINSZ as u32
}
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/// Get the size of the terminal.
#[cfg(not(target_os = "redox"))]
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pub fn terminal_size() -> Result<(usize, usize), TerminalError> {
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use libc::ioctl;
use libc::STDOUT_FILENO;
use std::mem;
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unsafe {
let mut size: TermSize = mem::zeroed();
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if ioctl(STDOUT_FILENO, tiocgwinsz(), &mut size as *mut _) == 0 {
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Ok((size.col as usize, size.row as usize))
} else {
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Err(TerminalError::TermSizeError)
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}
}
}
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/// Get the size of the terminal.
#[cfg(target_os = "redox")]
pub fn terminal_size() -> Result<(usize, usize), TerminalError> {
use std::env::var;
let w = var("COLUMNS").map_err(|_| TerminalError::TermSizeError).and_then(|x| {
x.parse().map_err(|_| TerminalError::ParseError)
});
let h = var("LINES").map_err(|_| TerminalError::TermSizeError).and_then(|x| {
x.parse().map_err(|_| TerminalError::ParseError)
});
Ok((try!(w), try!(h)))
}
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#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_size() {
assert!(terminal_size().is_ok());
}
}