wasmer/src/apis/emscripten/time.rs

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use super::utils::copy_cstr_into_wasm;
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use libc::{
c_int,
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c_long,
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clock_gettime as libc_clock_gettime,
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// tm,
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localtime,
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time,
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time_t,
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timespec,
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};
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use std::mem;
use std::time::SystemTime;
use crate::webassembly::Instance;
/// emscripten: _gettimeofday
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pub extern "C" fn _gettimeofday(tp: c_int, tz: c_int, instance: &mut Instance) -> c_int {
#[repr(C)]
struct GuestTimeVal {
tv_sec: i32,
tv_usec: i32,
}
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assert!(
tz == 0,
"the timezone argument of `_gettimeofday` must be null"
);
unsafe {
let now = SystemTime::now();
let since_epoch = now.duration_since(SystemTime::UNIX_EPOCH).unwrap();
let timeval_struct_ptr = instance.memory_offset_addr(0, tp as _) as *mut GuestTimeVal;
(*timeval_struct_ptr).tv_sec = since_epoch.as_secs() as _;
(*timeval_struct_ptr).tv_usec = since_epoch.subsec_nanos() as _;
}
0
}
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/// emscripten: _clock_gettime
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pub extern "C" fn _clock_gettime(clk_id: c_int, tp: c_int, instance: &mut Instance) -> c_int {
#[repr(C)]
struct GuestTimeSpec {
tv_sec: i32,
tv_nsec: i32,
}
unsafe {
let mut timespec = timespec {
tv_sec: 0,
tv_nsec: 0,
};
let ret = libc_clock_gettime(clk_id as _, &mut timespec);
if ret != 0 {
return ret;
}
let timespec_struct_ptr = instance.memory_offset_addr(0, tp as _) as *mut GuestTimeSpec;
(*timespec_struct_ptr).tv_sec = timespec.tv_sec as _;
(*timespec_struct_ptr).tv_nsec = timespec.tv_nsec as _;
}
0
}
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/// emscripten: _localtime
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pub extern "C" fn _localtime(time_p: u32, instance: &mut Instance) -> c_int {
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debug!("emscripten::_localtime {}", time_p);
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#[repr(C)]
struct GuestTm {
tm_sec: i32,
tm_min: i32,
tm_hour: i32,
tm_mday: i32,
tm_mon: i32,
tm_year: i32,
tm_wday: i32,
tm_yday: i32,
tm_isdst: i32,
tm_gmtoff: c_long,
tm_zone: u32,
}
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unsafe {
let time_p_addr = instance.memory_offset_addr(0, time_p as _) as *mut i64;
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let tm_struct = &*localtime(time_p_addr);
// Webassembly allocation
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let tm_struct_offset = (instance.emscripten_data.as_ref().unwrap().malloc)(
mem::size_of::<GuestTm>() as _,
instance,
);
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let tm_struct_ptr = instance.memory_offset_addr(0, tm_struct_offset as _) as *mut GuestTm;
// Initializing
(*tm_struct_ptr).tm_sec = tm_struct.tm_sec;
(*tm_struct_ptr).tm_min = tm_struct.tm_min;
(*tm_struct_ptr).tm_hour = tm_struct.tm_hour;
(*tm_struct_ptr).tm_mday = tm_struct.tm_mday;
(*tm_struct_ptr).tm_mon = tm_struct.tm_mon;
(*tm_struct_ptr).tm_year = tm_struct.tm_year;
(*tm_struct_ptr).tm_wday = tm_struct.tm_wday;
(*tm_struct_ptr).tm_yday = tm_struct.tm_yday;
(*tm_struct_ptr).tm_isdst = tm_struct.tm_isdst;
(*tm_struct_ptr).tm_gmtoff = tm_struct.tm_gmtoff;
(*tm_struct_ptr).tm_zone = copy_cstr_into_wasm(instance, tm_struct.tm_zone);
tm_struct_offset as c_int
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}
}
/// emscripten: _time
pub extern "C" fn _time(time_p: u32, instance: &mut Instance) -> time_t {
debug!("emscripten::_time {}", time_p);
unsafe {
let time_p_addr = instance.memory_offset_addr(0, time_p as _) as *mut i64;
time(time_p_addr)
}
}
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/// emscripten: _strftime
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pub extern "C" fn _strftime(
s_ptr: c_int,
maxsize: u32,
format_ptr: c_int,
tm_ptr: c_int,
_instance: &mut Instance,
) -> time_t {
debug!(
"emscripten::_strftime {} {} {} {}",
s_ptr, maxsize, format_ptr, tm_ptr
);
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0
}