auronandace
65 lines
1.9 KiB
Rust
65 lines
1.9 KiB
Rust
use crate::{
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header::time::NANOSECONDS,
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platform::types::{c_long, time_t},
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};
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/time.h.html>.
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#[repr(C)]
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#[derive(Clone, Default, Debug)]
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pub struct timespec {
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pub tv_sec: time_t,
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pub tv_nsec: c_long,
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}
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impl timespec {
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// TODO: Write test
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/// similar logic with timeradd
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#[allow(clippy::should_implement_trait)] // not to confuse std::ops::Add
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pub fn add(base: timespec, interval: timespec) -> Option<timespec> {
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let delta_sec = base.tv_sec.checked_add(interval.tv_sec)?;
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let delta_nsec = base.tv_nsec.checked_add(interval.tv_nsec)?;
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if delta_sec < 0 || delta_nsec < 0 {
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return None;
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}
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Some(Self {
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tv_sec: delta_sec + (delta_nsec / NANOSECONDS) as time_t,
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tv_nsec: delta_nsec % NANOSECONDS,
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})
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}
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/// similar logic with timersub
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pub fn subtract(later: timespec, earlier: timespec) -> Option<timespec> {
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let delta_sec = later.tv_sec.checked_sub(earlier.tv_sec)?;
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let delta_nsec = later.tv_nsec.checked_sub(earlier.tv_nsec)?;
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let time = if delta_nsec < 0 {
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let roundup_sec = -delta_nsec / NANOSECONDS + 1;
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timespec {
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tv_sec: delta_sec - (roundup_sec as time_t),
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tv_nsec: roundup_sec * NANOSECONDS - delta_nsec,
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}
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} else {
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timespec {
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tv_sec: delta_sec + (delta_nsec / NANOSECONDS) as time_t,
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tv_nsec: delta_nsec % NANOSECONDS,
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}
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};
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if time.tv_sec < 0 {
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// https://man7.org/linux/man-pages/man2/settimeofday.2.html
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// caller should return EINVAL
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return None;
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}
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Some(time)
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}
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pub fn is_default(&self) -> bool {
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self.tv_nsec == 0 && self.tv_sec == 0
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}
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}
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn cbindgen_stupid_alias_timespec(_: timespec) {}
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