fn dur2timeout()

in src/platform_impl/windows/event_loop.rs [364:390]

• 27 lines of code
• 2 McCabe index (conditional complexity)

fn dur2timeout(dur: Duration) -> DWORD {
    // Note that a duration is a (u64, u32) (seconds, nanoseconds) pair, and the
    // timeouts in windows APIs are typically u32 milliseconds. To translate, we
    // have two pieces to take care of:
    //
    // * Nanosecond precision is rounded up
    // * Greater than u32::MAX milliseconds (50 days) is rounded up to INFINITE
    //   (never time out).
    dur.as_secs()
        .checked_mul(1000)
        .and_then(|ms| ms.checked_add((dur.subsec_nanos() as u64) / 1_000_000))
        .and_then(|ms| {
            ms.checked_add(if dur.subsec_nanos() % 1_000_000 > 0 {
                1
            } else {
                0
            })
        })
        .map(|ms| {
            if ms > DWORD::max_value() as u64 {
                winbase::INFINITE
            } else {
                ms as DWORD
            }
        })
        .unwrap_or(winbase::INFINITE)
}