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add over/under-flow protections to calculation

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Roy Ivy III 2024-05-18 14:45:53 -05:00 committed by David Sherret
parent 5c58cb2bf5
commit 0cee79e4bf
1 changed files with 14 additions and 4 deletions
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18
runtime/ops/tty.rs
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@ -351,10 +351,20 @@ fn console_size_from_fd(
{
return Err(Error::last_os_error());
}
Ok(ConsoleSize {
cols: bufinfo.srWindow.Right as u32 - bufinfo.srWindow.Left as u32 + 1,
rows: bufinfo.srWindow.Bottom as u32 - bufinfo.srWindow.Top as u32 + 1,
})
// calculate the size of the visible window
// * use over/under-flow protections b/c MSDN docs only imply that srWindow components are all non-negative
// * ref: <https://docs.microsoft.com/en-us/windows/console/console-screen-buffer-info-str> @@ <https://archive.is/sfjnm>
let cols = std::cmp::max(
bufinfo.srWindow.Right as i32 - bufinfo.srWindow.Left as i32 + 1,
0,
) as u32;
let rows = std::cmp::max(
bufinfo.srWindow.Bottom as i32 - bufinfo.srWindow.Top as i32 + 1,
0,
) as u32;
Ok(ConsoleSize { cols, rows })
}
}