Function xed_sys::xed_itoa_hex_zeros

pub unsafe extern "C" fn xed_itoa_hex_zeros(
    buf: *mut c_char, 
    f: u64, 
    bits_to_print: xed_uint_t, 
    leading_zeros: xed_bool_t, 
    buflen: c_int
) -> c_int

defaults to lowercase