You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ether_wake.rs
    path of file: ./repos/rustybox/networking
    
    the code of the file until where you have to start completion: use crate::librb::size_t;
use libc;
use libc::sockaddr;
use libc::sscanf;
extern "C" {
  #[no_mangle]
  fn memcpy(_: *mut libc::c_void, _: *const libc::c_void, _: libc::c_ulong) -> *mut libc::c_void;

  #[no_mangle]
  static mut optind: libc::c_int;

    
unsafe extern "C" fn get_dest_addr(mut hostid: *const libc::c_char, mut eaddr: *mut ether_addr) {
  let mut eap: *mut ether_addr = std::ptr::null_mut(); /* 6 */
  eap = ether_aton_r(hostid, eaddr); /* 12 */
  /* Or 0x0806 for ARP, 0x8035 for RARP */
  if eap.is_null() {
    if ether_hostton(hostid, eaddr) == 0 {
    } else {
      crate::libbb::appletlib::bb_show_usage(); /* 13 */
    }
  }; /* 14 */
}