library/std/src/sys/solid/time.rs

   1 use super::{abi, error::expect_success};
   2 use crate::{mem::MaybeUninit, time::Duration};
   3
   4 pub use super::itron::time::Instant;
   5
   6 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
   7 pub struct SystemTime(abi::time_t);
   8
   9 pub const UNIX_EPOCH: SystemTime = SystemTime(0);
  10
  11 impl SystemTime {
  12     pub fn now() -> SystemTime {
  13         let rtc = unsafe {
  14             let mut out = MaybeUninit::zeroed();
  15             expect_success(abi::SOLID_RTC_ReadTime(out.as_mut_ptr()), &"SOLID_RTC_ReadTime");
  16             out.assume_init()
  17         };
  18         let t = unsafe {
  19             libc::mktime(&mut libc::tm {
  20                 tm_sec: rtc.tm_sec,
  21                 tm_min: rtc.tm_min,
  22                 tm_hour: rtc.tm_hour,
  23                 tm_mday: rtc.tm_mday,
  24                 tm_mon: rtc.tm_mon - 1,
  25                 tm_year: rtc.tm_year,
  26                 tm_wday: rtc.tm_wday,
  27                 tm_yday: 0,
  28                 tm_isdst: 0,
  29                 tm_gmtoff: 0,
  30                 tm_zone: crate::ptr::null_mut(),
  31             })
  32         };
  33         assert_ne!(t, -1, "mktime failed");
  34         SystemTime(t)
  35     }
  36
  37     pub(super) fn from_time_t(t: abi::time_t) -> Self {
  38         Self(t)
  39     }
  40
  41     pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
  42         if self.0 >= other.0 {
  43             Ok(Duration::from_secs((self.0 as u64).wrapping_sub(other.0 as u64)))
  44         } else {
  45             Err(Duration::from_secs((other.0 as u64).wrapping_sub(self.0 as u64)))
  46         }
  47     }
  48
  49     pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
  50         Some(SystemTime(self.0.checked_add(other.as_secs().try_into().ok()?)?))
  51     }
  52
  53     pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
  54         Some(SystemTime(self.0.checked_sub(other.as_secs().try_into().ok()?)?))
  55     }
  56 }