Function libnspire_sys::nspire_file_read

pub unsafe extern "C" fn nspire_file_read(
    handle: *mut nspire_handle_t, 
    path: *const c_char, 
    data: *mut c_void, 
    size: usize, 
    read_bytes: *mut usize, 
    cb: nspire_callback, 
    cb_data: *mut c_void
) -> c_int