busybox

cp: make "cp file /dev/node" special case; explained in comments

function                                             old     new   delta
copy_file                                           1487    1538     +51
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 51/0)               Total: 51 bytes
   text    data     bss     dec     hex filename
 772502    1051   10724  784277   bf795 busybox_old
 772554    1051   10724  784329   bf7c9 busybox_unstripped