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: blkid.rs
    path of file: ./repos/rustybox/util_linux
    
    the code of the file until where you have to start completion: use libc;

/*
 * Print UUIDs on all filesystems
 *
 * Copyright (C) 2008 Denys Vlasenko.
 *
 * Licensed under GPLv2, see file LICENSE in this source tree.
 */
//config:config BLKID
    
pub unsafe fn blkid_main(mut _argc: libc::c_int, mut argv: *mut *mut libc::c_char) -> libc::c_int {
  let mut scan_devices: libc::c_int = 1i32;
  loop {
    argv = argv.offset(1);
    if (*argv).is_null() {
      break;
    }
    /* Note: bogus device names don't cause any error messages */
    crate::util_linux::volume_id::get_devname::add_to_uuid_cache(*argv);
    scan_devices = 0
  }
  crate::util_linux::volume_id::get_devname::display_uuid_cache(scan_devices);
  return 0;
}