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    // Copyright 2012-2014 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 super::Tm;
    use libc::{self, time_t};
    use std::io;
    use std::mem;

    #[cfg(any(target_os = "solaris", target_os = "illumos"))]
    extern "C" {
        static timezone: time_t;
        static altzone: time_t;
    }

    #[cfg(any(target_os = "solaris", target_os = "illumos"))]
    fn tzset() {
        extern "C" {
            fn tzset();
        }
        unsafe { tzset() }
    }

    fn rust_tm_to_tm(rust_tm: &Tm, tm: &mut libc::tm) {
        tm.tm_sec = rust_tm.tm_sec;
        tm.tm_min = rust_tm.tm_min;
        tm.tm_hour = rust_tm.tm_hour;
        tm.tm_mday = rust_tm.tm_mday;
        tm.tm_mon = rust_tm.tm_mon;
        tm.tm_year = rust_tm.tm_year;
        tm.tm_wday = rust_tm.tm_wday;
        tm.tm_yday = rust_tm.tm_yday;
        tm.tm_isdst = rust_tm.tm_isdst;
    }

    fn tm_to_rust_tm(tm: &libc::tm, utcoff: i32, rust_tm: &mut Tm) {
        rust_tm.tm_sec = tm.tm_sec;
        rust_tm.tm_min = tm.tm_min;
        rust_tm.tm_hour = tm.tm_hour;
        rust_tm.tm_mday = tm.tm_mday;
        rust_tm.tm_mon = tm.tm_mon;
        rust_tm.tm_year = tm.tm_year;
        rust_tm.tm_wday = tm.tm_wday;
        rust_tm.tm_yday = tm.tm_yday;
        rust_tm.tm_isdst = tm.tm_isdst;
        rust_tm.tm_utcoff = utcoff;
    }

    #[cfg(any(target_os = "nacl", target_os = "solaris", target_os = "illumos"))]
    unsafe fn timegm(tm: *mut libc::tm) -> time_t {
        use std::env::{remove_var, set_var, var_os};
        extern "C" {
            fn tzset();
        }

        let ret;

        let current_tz = var_os("TZ");
        set_var("TZ", "UTC");
        tzset();

        ret = libc::mktime(tm);

        if let Some(tz) = current_tz {
            set_var("TZ", tz);
        } else {
            remove_var("TZ");
        }
        tzset();

        ret
    }

    pub fn time_to_local_tm(sec: i64, tm: &mut Tm) {
        unsafe {
            let sec = sec as time_t;
            let mut out = mem::zeroed();
            if libc::localtime_r(&sec, &mut out).is_null() {
                panic!("localtime_r failed: {}", io::Error::last_os_error());
            }
            #[cfg(any(target_os = "solaris", target_os = "illumos"))]
            let gmtoff = {
                tzset();
                // < 0 means we don't know; assume we're not in DST.
                if out.tm_isdst == 0 {
                    // timezone is seconds west of UTC, tm_gmtoff is seconds east
                    -timezone
                } else if out.tm_isdst > 0 {
                    -altzone
                } else {
                    -timezone
                }
            };
            #[cfg(not(any(target_os = "solaris", target_os = "illumos")))]
            let gmtoff = out.tm_gmtoff;
            tm_to_rust_tm(&out, gmtoff as i32, tm);
        }
    }

    pub fn utc_tm_to_time(rust_tm: &Tm) -> i64 {
        #[cfg(not(any(
            all(target_os = "android", target_pointer_width = "32"),
            target_os = "nacl",
            target_os = "solaris",
            target_os = "illumos"
        )))]
        use libc::timegm;
        #[cfg(all(target_os = "android", target_pointer_width = "32"))]
        use libc::timegm64 as timegm;

        let mut tm = unsafe { mem::zeroed() };
        rust_tm_to_tm(rust_tm, &mut tm);
        unsafe { timegm(&mut tm) as i64 }
    }

    pub fn local_tm_to_time(rust_tm: &Tm) -> i64 {
        let mut tm = unsafe { mem::zeroed() };
        rust_tm_to_tm(rust_tm, &mut tm);
        unsafe { libc::mktime(&mut tm) as i64 }
    }