getrandom 0.3.4

A small cross-platform library for retrieving random data from system source
Documentation 
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//! Implementation for iOS, tvOS, and watchOS where `getentropy` is unavailable.
use crate::Error;
use core::{ffi::c_void, mem::MaybeUninit};

pub use crate::util::{inner_u32, inner_u64};

#[inline]
pub fn fill_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error> {
    let dst_ptr = dest.as_mut_ptr().cast::<c_void>();
    let ret = unsafe { libc::CCRandomGenerateBytes(dst_ptr, dest.len()) };
    if ret == libc::kCCSuccess {
        Ok(())
    } else {
        Err(Error::IOS_RANDOM_GEN)
    }
}

impl Error {
    /// Call to `CCRandomGenerateBytes` failed.
    pub(crate) const IOS_RANDOM_GEN: Error = Self::new_internal(10);
}