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|
use std::{fmt, ops};
use std::num::Int;
use std::i64;
use libc::{time_t, suseconds_t};
#[repr(C)]
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug)]
pub struct TimeVal {
pub tv_sec: time_t,
pub tv_usec: suseconds_t,
}
const MICROS_PER_SEC: i64 = 1_000_000;
const SECS_PER_MINUTE: i64 = 60;
const SECS_PER_HOUR: i64 = 3600;
const MIN: TimeVal = TimeVal {
tv_sec: -(i64::MAX / MICROS_PER_SEC - 1),
tv_usec: (-(MICROS_PER_SEC - 1)) as suseconds_t,
};
const MAX: TimeVal = TimeVal {
tv_sec: i64::MAX / MICROS_PER_SEC - 1,
tv_usec: (MICROS_PER_SEC - 1) as suseconds_t,
};
impl TimeVal {
#[inline]
pub fn zero() -> TimeVal {
TimeVal::microseconds(0)
}
#[inline]
pub fn hours(hours: i64) -> TimeVal {
let secs = hours.checked_mul(SECS_PER_HOUR)
.expect("TimeVal::hours ouf of bounds");
TimeVal::seconds(secs)
}
#[inline]
pub fn minutes(minutes: i64) -> TimeVal {
let secs = minutes.checked_mul(SECS_PER_MINUTE)
.expect("TimeVal::minutes out of bounds");
TimeVal::seconds(secs)
}
#[inline]
pub fn seconds(seconds: i64) -> TimeVal {
let ret = TimeVal { tv_sec: seconds, tv_usec: 0 };
assert!(ret >= MIN && ret <= MAX, "TimeVal out of bounds");
ret
}
#[inline]
pub fn milliseconds(milliseconds: i64) -> TimeVal {
let microseconds = milliseconds.checked_mul(1_000)
.expect("TimeVal::milliseconds out of bounds");
TimeVal::microseconds(microseconds)
}
/// Makes a new `TimeVal` with given number of microseconds.
#[inline]
#[unstable(feature = "std_misc")]
pub fn microseconds(microseconds: i64) -> TimeVal {
let (secs, micros) = div_mod_floor_64(microseconds, MICROS_PER_SEC);
let ret = TimeVal { tv_sec: secs, tv_usec: micros as suseconds_t };
assert!(ret >= MIN && ret <= MAX, "TimeVal out of bounds");
ret
}
pub fn num_hours(&self) -> i64 {
self.num_seconds() / 3600
}
pub fn num_minutes(&self) -> i64 {
self.num_seconds() / 60
}
pub fn num_seconds(&self) -> i64 {
if self.tv_sec < 0 && self.tv_usec > 0 {
self.tv_sec + 1
} else {
self.tv_sec
}
}
pub fn num_milliseconds(&self) -> i64 {
self.num_microseconds() / 1_000
}
pub fn num_microseconds(&self) -> i64 {
let secs = self.num_seconds() * 1_000_000;
let usec = self.micros_mod_sec();
secs + usec as i64
}
fn micros_mod_sec(&self) -> suseconds_t {
if self.tv_sec < 0 && self.tv_usec > 0 {
self.tv_usec - MICROS_PER_SEC as suseconds_t
} else {
self.tv_usec
}
}
}
impl ops::Neg for TimeVal {
type Output = TimeVal;
fn neg(self) -> TimeVal {
TimeVal::microseconds(-self.num_microseconds())
}
}
impl ops::Add for TimeVal {
type Output = TimeVal;
fn add(self, rhs: TimeVal) -> TimeVal {
TimeVal::microseconds(
self.num_microseconds() + rhs.num_microseconds())
}
}
impl ops::Sub for TimeVal {
type Output = TimeVal;
fn sub(self, rhs: TimeVal) -> TimeVal {
TimeVal::microseconds(
self.num_microseconds() - rhs.num_microseconds())
}
}
impl ops::Mul<i32> for TimeVal {
type Output = TimeVal;
fn mul(self, rhs: i32) -> TimeVal {
let usec = self.num_microseconds().checked_mul(rhs as i64)
.expect("TimeVal multiply out of bounds");
TimeVal::microseconds(usec)
}
}
impl ops::Div<i32> for TimeVal {
type Output = TimeVal;
fn div(self, rhs: i32) -> TimeVal {
let usec = self.num_microseconds() / rhs as i64;
TimeVal::microseconds(usec)
}
}
impl fmt::Display for TimeVal {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let (abs, sign) = if self.tv_sec < 0 {
(-*self, "-")
} else {
(*self, "")
};
let sec = abs.tv_sec;
try!(write!(f, "{}", sign));
if abs.tv_usec == 0 {
if abs.tv_sec == 1 {
try!(write!(f, "{} second", sec));
} else {
try!(write!(f, "{} seconds", sec));
}
} else if abs.tv_usec % 1000 == 0 {
try!(write!(f, "{}.{:03} seconds", sec, abs.tv_usec / 1000));
} else {
try!(write!(f, "{}.{:06} seconds", sec, abs.tv_usec));
}
Ok(())
}
}
#[inline]
fn div_mod_floor_64(this: i64, other: i64) -> (i64, i64) {
(div_floor_64(this, other), mod_floor_64(this, other))
}
#[inline]
fn div_floor_64(this: i64, other: i64) -> i64 {
match div_rem_64(this, other) {
(d, r) if (r > 0 && other < 0)
|| (r < 0 && other > 0) => d - 1,
(d, _) => d,
}
}
#[inline]
fn mod_floor_64(this: i64, other: i64) -> i64 {
match this % other {
r if (r > 0 && other < 0)
|| (r < 0 && other > 0) => r + other,
r => r,
}
}
#[inline]
fn div_rem_64(this: i64, other: i64) -> (i64, i64) {
(this / other, this % other)
}
#[cfg(test)]
mod test {
use super::TimeVal;
#[test]
pub fn test_time_val() {
assert!(TimeVal::seconds(1) != TimeVal::zero());
assert_eq!(TimeVal::seconds(1) + TimeVal::seconds(2), TimeVal::seconds(3));
assert_eq!(TimeVal::minutes(3) + TimeVal::seconds(2),
TimeVal::seconds(182));
}
#[test]
pub fn test_time_val_neg() {
let a = TimeVal::seconds(1) + TimeVal::microseconds(123);
let b = TimeVal::seconds(-1) + TimeVal::microseconds(-123);
assert_eq!(a, -b);
}
#[test]
pub fn test_time_val_fmt() {
assert_eq!(TimeVal::zero().to_string(), "0 seconds");
assert_eq!(TimeVal::seconds(42).to_string(), "42 seconds");
assert_eq!(TimeVal::milliseconds(42).to_string(), "0.042 seconds");
assert_eq!(TimeVal::microseconds(42).to_string(), "0.000042 seconds");
assert_eq!(TimeVal::seconds(-86401).to_string(), "-86401 seconds");
}
}
|
