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: safe_gethostname.rs
    path of file: ./repos/rustybox/libbb
    
    the code of the file until where you have to start completion: use libc;
extern "C" {

  #[no_mangle]
  fn uname(__name: *mut utsname) -> libc::c_int;
}

#[repr(C)]
#[derive(Co
    
pub unsafe fn safe_gethostname() -> *mut libc::c_char {
  let mut uts: utsname = utsname {
    sysname: [0; 65],
    nodename: [0; 65],
    release: [0; 65],
    version: [0; 65],
    machine: [0; 65],
    domainname: [0; 65],
  };
  /* The length of the arrays in a struct utsname is unspecified;
   * the fields are terminated by a null byte.
   * Note that there is no standard that says that the hostname
   * set by sethostname(2) is the same string as the nodename field of the
   * struct returned by uname (indeed, some systems allow a 256-byte host-
   * name and an 8-byte nodename), but this is true on Linux. The same holds
   * for setdomainname(2) and the domainname field.
   */
  /* Uname can fail only if you pass a bad pointer to it. */
  uname(&mut uts);
  return crate::libbb::xfuncs_printf::xstrndup(
    if uts.nodename[0] == 0 {
      b"?\x00" as *const u8 as *const libc::c_char
    } else {
      uts.nodename.as_mut_ptr()
    },
    ::std::mem::size_of::<[libc::c_char; 65]>() as libc::c_ulong as libc::c_int,
  );
}