//! sys/time implementation for Redox, following http://pubs.opengroup.org/onlinepubs/7908799/xsh/systime.h.html

use crate::{
    c_str::CStr,
    header::time::timespec,
    platform::{types::*, Pal, PalSignal, Sys},
};
use core::ptr::null;

pub const ITIMER_REAL: c_int = 0;
pub const ITIMER_VIRTUAL: c_int = 1;
pub const ITIMER_PROF: c_int = 2;

#[repr(C)]
#[derive(Default)]
pub struct timeval {
    pub tv_sec: time_t,
    pub tv_usec: suseconds_t,
}
#[repr(C)]
#[derive(Default)]
pub struct timezone {
    pub tz_minuteswest: c_int,
    pub tz_dsttime: c_int,
}

#[repr(C)]
#[derive(Default)]
pub struct itimerval {
    pub it_interval: timeval,
    pub it_value: timeval,
}

#[repr(C)]
pub struct fd_set {
    pub fds_bits: [c_long; 16usize],
}

#[no_mangle]
pub unsafe extern "C" fn getitimer(which: c_int, value: *mut itimerval) -> c_int {
    Sys::getitimer(which, value)
}

#[no_mangle]
pub unsafe extern "C" fn setitimer(
    which: c_int,
    value: *const itimerval,
    ovalue: *mut itimerval,
) -> c_int {
    Sys::setitimer(which, value, ovalue)
}

#[no_mangle]
pub unsafe extern "C" fn gettimeofday(tp: *mut timeval, tzp: *mut timezone) -> c_int {
    Sys::gettimeofday(tp, tzp)
}

#[no_mangle]
pub unsafe extern "C" fn utimes(path: *const c_char, times: *const timeval) -> c_int {
    let path = CStr::from_ptr(path);
    // Nullptr is valid here, it means "use current time"
    let times_spec = if times.is_null() {
        null()
    } else {
        {
            [
                timespec {
                    tv_sec: (*times.offset(0)).tv_sec,
                    tv_nsec: ((*times.offset(0)).tv_usec as c_long) * 1000,
                },
                timespec {
                    tv_sec: (*times.offset(1)).tv_sec,
                    tv_nsec: ((*times.offset(1)).tv_usec as c_long) * 1000,
                },
            ]
        }
        .as_ptr()
    };
    Sys::utimens(path, times_spec)
}