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: in_ether.rs
    path of file: ./repos/rustybox/libbb
    
    the code of the file until where you have to start completion: use libc;
use libc::sa_family_t;
use libc::sockaddr;
/*
 * Busybox main internal header file
 *
 * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
 * Permission has been granted to redistribute this code under GPL.
 *
 * Licensed under GPLv2, see file LICENSE in this source tree.
 */
/* TODO: and glibc? */
/* There are two incompatible basename's, le
    
pub unsafe fn in_ether(mut bufp: *const libc::c_char, mut sap: *mut sockaddr) -> libc::c_int {
  let mut ptr: *mut libc::c_char = std::ptr::null_mut::<libc::c_char>();
  let mut i: libc::c_int = 0;
  let mut j: libc::c_int = 0;
  let mut val: libc::c_uchar = 0;
  let mut c: libc::c_uchar = 0;
  (*sap).sa_family = 1i32 as sa_family_t;
  ptr = (*sap).sa_data.as_mut_ptr();
  i = 6i32;
  loop {
    val = 0 as libc::c_uchar;
    j = val as libc::c_int;
    loop {
      c = *bufp as libc::c_uchar;
      if (c as libc::c_int - '0' as i32) as libc::c_uchar as libc::c_int <= 9i32 {
        c = (c as libc::c_int - '0' as i32) as libc::c_uchar
      } else if ((c as libc::c_int | 0x20i32) - 'a' as i32) as libc::c_uchar as libc::c_int <= 5i32
      {
        c = (((c as libc::c_int | 0x20i32) - 'a' as i32) as libc::c_uchar as libc::c_int + 10i32)
          as libc::c_uchar
      } else {
        if j != 0 && (c as libc::c_int == ':' as i32 || c as libc::c_int == '\u{0}' as i32) {
          break;
        }
        return -1i32;
      }
      bufp = bufp.offset(1);
      val = ((val as libc::c_int) << 4i32) as libc::c_uchar;
      val = (val as libc::c_int + c as libc::c_int) as libc::c_uchar;
      j ^= 1i32;
      if !(j != 0) {
        break;
      }
    }
    let fresh0 = ptr;
    ptr = ptr.offset(1);
    *fresh0 = val as libc::c_char;
    i -= 1;
    if !(i != 0) {
      break;
    }
    /* We might get a semicolon here */
    if *bufp as libc::c_int == ':' as i32 {
      bufp = bufp.offset(1)
    }
  }
  /* Error if we aren't at end of string */
  return *bufp as libc::c_int;
}