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    // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    use cmp::Ordering;
    use libc;
    use time::Duration;
    use core::hash::{Hash, Hasher};

    pub use self::inner::{Instant, SystemTime, UNIX_EPOCH};
    use convert::TryInto;

    const NSEC_PER_SEC: u64 = 1_000_000_000;

    #[derive(Copy, Clone)]
    struct Timespec {
        t: libc::timespec,
    }

    impl Timespec {
        fn sub_timespec(&self, other: &Timespec) -> Result<Duration, Duration> {
            if self >= other {
                Ok(if self.t.tv_nsec >= other.t.tv_nsec {
                    Duration::new((self.t.tv_sec - other.t.tv_sec) as u64,
                                  (self.t.tv_nsec - other.t.tv_nsec) as u32)
                } else {
                    Duration::new((self.t.tv_sec - 1 - other.t.tv_sec) as u64,
                                  self.t.tv_nsec as u32 + (NSEC_PER_SEC as u32) -
                                  other.t.tv_nsec as u32)
                })
            } else {
                match other.sub_timespec(self) {
                    Ok(d) => Err(d),
                    Err(d) => Ok(d),
                }
            }
        }

        fn add_duration(&self, other: &Duration) -> Timespec {
            let mut secs = other
                .as_secs()
                .try_into() // <- target type would be `libc::time_t`
                .ok()
                .and_then(|secs| self.t.tv_sec.checked_add(secs))
                .expect("overflow when adding duration to time");

            // Nano calculations can't overflow because nanos are <1B which fit
            // in a u32.
            let mut nsec = other.subsec_nanos() + self.t.tv_nsec as u32;
            if nsec >= NSEC_PER_SEC as u32 {
                nsec -= NSEC_PER_SEC as u32;
                secs = secs.checked_add(1).expect("overflow when adding \
                                                   duration to time");
            }
            Timespec {
                t: libc::timespec {
                    tv_sec: secs,
                    tv_nsec: nsec as _,
                },
            }
        }

        fn sub_duration(&self, other: &Duration) -> Timespec {
            let mut secs = other
                .as_secs()
                .try_into() // <- target type would be `libc::time_t`
                .ok()
                .and_then(|secs| self.t.tv_sec.checked_sub(secs))
                .expect("overflow when subtracting duration from time");

            // Similar to above, nanos can't overflow.
            let mut nsec = self.t.tv_nsec as i32 - other.subsec_nanos() as i32;
            if nsec < 0 {
                nsec += NSEC_PER_SEC as i32;
                secs = secs.checked_sub(1).expect("overflow when subtracting \
                                                   duration from time");
            }
            Timespec {
                t: libc::timespec {
                    tv_sec: secs,
                    tv_nsec: nsec as _,
                },
            }
        }
    }

    impl PartialEq for Timespec {
        fn eq(&self, other: &Timespec) -> bool {
            self.t.tv_sec == other.t.tv_sec && self.t.tv_nsec == other.t.tv_nsec
        }
    }

    impl Eq for Timespec {}

    impl PartialOrd for Timespec {
        fn partial_cmp(&self, other: &Timespec) -> Option<Ordering> {
            Some(self.cmp(other))
        }
    }

    impl Ord for Timespec {
        fn cmp(&self, other: &Timespec) -> Ordering {
            let me = (self.t.tv_sec, self.t.tv_nsec);
            let other = (other.t.tv_sec, other.t.tv_nsec);
            me.cmp(&other)
        }
    }

    impl Hash for Timespec {
        fn hash<H : Hasher>(&self, state: &mut H) {
            self.t.tv_sec.hash(state);
            self.t.tv_nsec.hash(state);
        }
    }

    #[cfg(any(target_os = "macos", target_os = "ios"))]
    mod inner {
        use fmt;
        use libc;
        use sync::Once;
        use sys::cvt;
        use sys_common::mul_div_u64;
        use time::Duration;

        use super::NSEC_PER_SEC;
        use super::Timespec;

        #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
        pub struct Instant {
            t: u64
        }

        #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
        pub struct SystemTime {
            t: Timespec,
        }

        pub const UNIX_EPOCH: SystemTime = SystemTime {
            t: Timespec {
                t: libc::timespec {
                    tv_sec: 0,
                    tv_nsec: 0,
                },
            },
        };

        impl Instant {
            pub fn now() -> Instant {
                Instant { t: unsafe { libc::mach_absolute_time() } }
            }

            pub fn sub_instant(&self, other: &Instant) -> Duration {
                let info = info();
                let diff = self.t.checked_sub(other.t)
                               .expect("second instant is later than self");
                let nanos = mul_div_u64(diff, info.numer as u64, info.denom as u64);
                Duration::new(nanos / NSEC_PER_SEC, (nanos % NSEC_PER_SEC) as u32)
            }

            pub fn add_duration(&self, other: &Duration) -> Instant {
                Instant {
                    t: self.t.checked_add(dur2intervals(other))
                           .expect("overflow when adding duration to instant"),
                }
            }

            pub fn sub_duration(&self, other: &Duration) -> Instant {
                Instant {
                    t: self.t.checked_sub(dur2intervals(other))
                           .expect("overflow when subtracting duration from instant"),
                }
            }
        }

        impl SystemTime {
            pub fn now() -> SystemTime {
                use ptr;

                let mut s = libc::timeval {
                    tv_sec: 0,
                    tv_usec: 0,
                };
                cvt(unsafe {
                    libc::gettimeofday(&mut s, ptr::null_mut())
                }).unwrap();
                return SystemTime::from(s)
            }

            pub fn sub_time(&self, other: &SystemTime)
                            -> Result<Duration, Duration> {
                self.t.sub_timespec(&other.t)
            }

            pub fn add_duration(&self, other: &Duration) -> SystemTime {
                SystemTime { t: self.t.add_duration(other) }
            }

            pub fn sub_duration(&self, other: &Duration) -> SystemTime {
                SystemTime { t: self.t.sub_duration(other) }
            }
        }

        impl From<libc::timeval> for SystemTime {
            fn from(t: libc::timeval) -> SystemTime {
                SystemTime::from(libc::timespec {
                    tv_sec: t.tv_sec,
                    tv_nsec: (t.tv_usec * 1000) as libc::c_long,
                })
            }
        }

        impl From<libc::timespec> for SystemTime {
            fn from(t: libc::timespec) -> SystemTime {
                SystemTime { t: Timespec { t: t } }
            }
        }

        impl fmt::Debug for SystemTime {
            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                f.debug_struct("SystemTime")
                 .field("tv_sec", &self.t.t.tv_sec)
                 .field("tv_nsec", &self.t.t.tv_nsec)
                 .finish()
            }
        }

        fn dur2intervals(dur: &Duration) -> u64 {
            let info = info();
            let nanos = dur.as_secs().checked_mul(NSEC_PER_SEC).and_then(|nanos| {
                nanos.checked_add(dur.subsec_nanos() as u64)
            }).expect("overflow converting duration to nanoseconds");
            mul_div_u64(nanos, info.denom as u64, info.numer as u64)
        }

        fn info() -> &'static libc::mach_timebase_info {
            static mut INFO: libc::mach_timebase_info = libc::mach_timebase_info {
                numer: 0,
                denom: 0,
            };
            static ONCE: Once = Once::new();

            unsafe {
                ONCE.call_once(|| {
                    libc::mach_timebase_info(&mut INFO);
                });
                &INFO
            }
        }
    }

    #[cfg(not(any(target_os = "macos", target_os = "ios")))]
    mod inner {
        use fmt;
        use libc;
        use sys::cvt;
        use time::Duration;

        use super::Timespec;

        #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
        pub struct Instant {
            t: Timespec,
        }

        #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
        pub struct SystemTime {
            t: Timespec,
        }

        pub const UNIX_EPOCH: SystemTime = SystemTime {
            t: Timespec {
                t: libc::timespec {
                    tv_sec: 0,
                    tv_nsec: 0,
                },
            },
        };

        impl Instant {
            pub fn now() -> Instant {
                Instant { t: now(libc::CLOCK_MONOTONIC) }
            }

            pub fn sub_instant(&self, other: &Instant) -> Duration {
                self.t.sub_timespec(&other.t).unwrap_or_else(|_| {
                    panic!("specified instant was later than self")
                })
            }

            pub fn add_duration(&self, other: &Duration) -> Instant {
                Instant { t: self.t.add_duration(other) }
            }

            pub fn sub_duration(&self, other: &Duration) -> Instant {
                Instant { t: self.t.sub_duration(other) }
            }
        }

        impl fmt::Debug for Instant {
            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                f.debug_struct("Instant")
                 .field("tv_sec", &self.t.t.tv_sec)
                 .field("tv_nsec", &self.t.t.tv_nsec)
                 .finish()
            }
        }

        impl SystemTime {
            pub fn now() -> SystemTime {
                SystemTime { t: now(libc::CLOCK_REALTIME) }
            }

            pub fn sub_time(&self, other: &SystemTime)
                            -> Result<Duration, Duration> {
                self.t.sub_timespec(&other.t)
            }

            pub fn add_duration(&self, other: &Duration) -> SystemTime {
                SystemTime { t: self.t.add_duration(other) }
            }

            pub fn sub_duration(&self, other: &Duration) -> SystemTime {
                SystemTime { t: self.t.sub_duration(other) }
            }
        }

        impl From<libc::timespec> for SystemTime {
            fn from(t: libc::timespec) -> SystemTime {
                SystemTime { t: Timespec { t: t } }
            }
        }

        impl fmt::Debug for SystemTime {
            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                f.debug_struct("SystemTime")
                 .field("tv_sec", &self.t.t.tv_sec)
                 .field("tv_nsec", &self.t.t.tv_nsec)
                 .finish()
            }
        }

        #[cfg(not(target_os = "dragonfly"))]
        pub type clock_t = libc::c_int;
        #[cfg(target_os = "dragonfly")]
        pub type clock_t = libc::c_ulong;

        fn now(clock: clock_t) -> Timespec {
            let mut t = Timespec {
                t: libc::timespec {
                    tv_sec: 0,
                    tv_nsec: 0,
                }
            };
            cvt(unsafe {
                libc::clock_gettime(clock, &mut t.t)
            }).unwrap();
            t
        }
    }

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