236 lines
6.9 KiB
Rust
236 lines
6.9 KiB
Rust
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use std::time::{SystemTime, UNIX_EPOCH};
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use super::{FixedOffset, Local};
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use crate::{DateTime, Datelike, LocalResult, NaiveDate, NaiveDateTime, NaiveTime, Timelike};
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pub(super) fn now() -> DateTime<Local> {
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tm_to_datetime(Timespec::now().local())
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}
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/// Converts a local `NaiveDateTime` to the `time::Timespec`.
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#[cfg(not(all(
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target_arch = "wasm32",
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feature = "wasmbind",
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not(any(target_os = "emscripten", target_os = "wasi"))
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)))]
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pub(super) fn naive_to_local(d: &NaiveDateTime, local: bool) -> LocalResult<DateTime<Local>> {
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let tm = Tm {
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tm_sec: d.second() as i32,
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tm_min: d.minute() as i32,
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tm_hour: d.hour() as i32,
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tm_mday: d.day() as i32,
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tm_mon: d.month0() as i32, // yes, C is that strange...
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tm_year: d.year() - 1900, // this doesn't underflow, we know that d is `NaiveDateTime`.
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tm_wday: 0, // to_local ignores this
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tm_yday: 0, // and this
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tm_isdst: -1,
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// This seems pretty fake?
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tm_utcoff: if local { 1 } else { 0 },
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// do not set this, OS APIs are heavily inconsistent in terms of leap second handling
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tm_nsec: 0,
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};
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let spec = Timespec {
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sec: match local {
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false => utc_tm_to_time(&tm),
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true => local_tm_to_time(&tm),
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},
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nsec: tm.tm_nsec,
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};
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// Adjust for leap seconds
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let mut tm = spec.local();
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assert_eq!(tm.tm_nsec, 0);
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tm.tm_nsec = d.nanosecond() as i32;
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LocalResult::Single(tm_to_datetime(tm))
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}
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/// Converts a `time::Tm` struct into the timezone-aware `DateTime`.
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/// This assumes that `time` is working correctly, i.e. any error is fatal.
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#[cfg(not(all(
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target_arch = "wasm32",
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feature = "wasmbind",
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not(any(target_os = "emscripten", target_os = "wasi"))
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)))]
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fn tm_to_datetime(mut tm: Tm) -> DateTime<Local> {
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if tm.tm_sec >= 60 {
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tm.tm_nsec += (tm.tm_sec - 59) * 1_000_000_000;
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tm.tm_sec = 59;
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}
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let date = NaiveDate::from_yo(tm.tm_year + 1900, tm.tm_yday as u32 + 1);
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let time = NaiveTime::from_hms_nano(
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tm.tm_hour as u32,
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tm.tm_min as u32,
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tm.tm_sec as u32,
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tm.tm_nsec as u32,
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);
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let offset = FixedOffset::east_opt(tm.tm_utcoff).unwrap();
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DateTime::from_utc(date.and_time(time) - offset, offset)
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}
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/// A record specifying a time value in seconds and nanoseconds, where
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/// nanoseconds represent the offset from the given second.
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///
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/// For example a timespec of 1.2 seconds after the beginning of the epoch would
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/// be represented as {sec: 1, nsec: 200000000}.
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struct Timespec {
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sec: i64,
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nsec: i32,
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}
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impl Timespec {
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/// Constructs a timespec representing the current time in UTC.
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fn now() -> Timespec {
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let st =
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SystemTime::now().duration_since(UNIX_EPOCH).expect("system time before Unix epoch");
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Timespec { sec: st.as_secs() as i64, nsec: st.subsec_nanos() as i32 }
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}
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/// Converts this timespec into the system's local time.
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fn local(self) -> Tm {
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let mut tm = Tm {
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tm_sec: 0,
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tm_min: 0,
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tm_hour: 0,
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tm_mday: 0,
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tm_mon: 0,
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tm_year: 0,
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tm_wday: 0,
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tm_yday: 0,
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tm_isdst: 0,
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tm_utcoff: 0,
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tm_nsec: 0,
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};
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time_to_local_tm(self.sec, &mut tm);
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tm.tm_nsec = self.nsec;
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tm
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}
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}
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/// Holds a calendar date and time broken down into its components (year, month,
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/// day, and so on), also called a broken-down time value.
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// FIXME: use c_int instead of i32?
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#[repr(C)]
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pub(super) struct Tm {
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/// Seconds after the minute - [0, 60]
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tm_sec: i32,
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/// Minutes after the hour - [0, 59]
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tm_min: i32,
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/// Hours after midnight - [0, 23]
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tm_hour: i32,
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/// Day of the month - [1, 31]
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tm_mday: i32,
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/// Months since January - [0, 11]
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tm_mon: i32,
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/// Years since 1900
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tm_year: i32,
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/// Days since Sunday - [0, 6]. 0 = Sunday, 1 = Monday, ..., 6 = Saturday.
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tm_wday: i32,
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/// Days since January 1 - [0, 365]
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tm_yday: i32,
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/// Daylight Saving Time flag.
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///
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/// This value is positive if Daylight Saving Time is in effect, zero if
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/// Daylight Saving Time is not in effect, and negative if this information
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/// is not available.
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tm_isdst: i32,
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/// Identifies the time zone that was used to compute this broken-down time
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/// value, including any adjustment for Daylight Saving Time. This is the
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/// number of seconds east of UTC. For example, for U.S. Pacific Daylight
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/// Time, the value is `-7*60*60 = -25200`.
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tm_utcoff: i32,
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/// Nanoseconds after the second - [0, 10<sup>9</sup> - 1]
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tm_nsec: i32,
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}
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fn time_to_tm(ts: i64, tm: &mut Tm) {
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let leapyear = |year| -> bool { year % 4 == 0 && (year % 100 != 0 || year % 400 == 0) };
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static YTAB: [[i64; 12]; 2] = [
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[31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31],
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[31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31],
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];
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let mut year = 1970;
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let dayclock = ts % 86400;
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let mut dayno = ts / 86400;
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tm.tm_sec = (dayclock % 60) as i32;
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tm.tm_min = ((dayclock % 3600) / 60) as i32;
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tm.tm_hour = (dayclock / 3600) as i32;
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tm.tm_wday = ((dayno + 4) % 7) as i32;
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loop {
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let yearsize = if leapyear(year) { 366 } else { 365 };
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if dayno >= yearsize {
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dayno -= yearsize;
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year += 1;
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} else {
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break;
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}
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}
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tm.tm_year = (year - 1900) as i32;
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tm.tm_yday = dayno as i32;
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let mut mon = 0;
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while dayno >= YTAB[if leapyear(year) { 1 } else { 0 }][mon] {
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dayno -= YTAB[if leapyear(year) { 1 } else { 0 }][mon];
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mon += 1;
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}
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tm.tm_mon = mon as i32;
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tm.tm_mday = dayno as i32 + 1;
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tm.tm_isdst = 0;
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}
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fn tm_to_time(tm: &Tm) -> i64 {
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let mut y = tm.tm_year as i64 + 1900;
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let mut m = tm.tm_mon as i64 + 1;
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if m <= 2 {
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y -= 1;
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m += 12;
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}
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let d = tm.tm_mday as i64;
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let h = tm.tm_hour as i64;
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let mi = tm.tm_min as i64;
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let s = tm.tm_sec as i64;
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(365 * y + y / 4 - y / 100 + y / 400 + 3 * (m + 1) / 5 + 30 * m + d - 719561) * 86400
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+ 3600 * h
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+ 60 * mi
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+ s
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}
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pub(super) fn time_to_local_tm(sec: i64, tm: &mut Tm) {
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// FIXME: Add timezone logic
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time_to_tm(sec, tm);
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}
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pub(super) fn utc_tm_to_time(tm: &Tm) -> i64 {
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tm_to_time(tm)
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}
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pub(super) fn local_tm_to_time(tm: &Tm) -> i64 {
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// FIXME: Add timezone logic
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tm_to_time(tm)
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}
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