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//! Implementation for Emscripten
use crate::{util_libc::last_os_error, Error};
use core::mem::MaybeUninit;
// Not yet defined in libc crate.
extern "C" {
fn getentropy(buffer: *mut libc::c_void, length: usize) -> libc::c_int;
}
pub fn getrandom_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error> {
// Emscripten 2.0.5 added getentropy, so we can use it unconditionally.
// Unlike other getentropy implementations, there is no max buffer length.
let ret = unsafe { getentropy(dest.as_mut_ptr() as *mut libc::c_void, dest.len()) };
if ret < 0 {
return Err(last_os_error());
}
Ok(())
}
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