NY.rb

require 'ffi'

module C
  extend FFI::Library
  ffi_lib 'c'

  attach_function :printf, [:varargs], :int
end

x = FFI::MemoryPointer.new(:long_long)
l = FFI::MemoryPointer.new(:long_long, 2)
x.write_long_long(1)
if x.read_char.nonzero? # Little-endian
  l.write_array_of_long_long([7299807751963697480, 9414436869185655])
else
  l.write_array_of_long_long([5215573471842553445, 8583959181729603840])
end
C.printf(:string, "%s\n", :pointer, l)