Minor drive-by cleanups to cpio. Whitespace, curly brackets, replace %4 with &3, turn a switch/case into if/else.
Redo od whitespace with multiple output types so the columns align.

Factor out single output type into od_out_t(), call it in a loop for each type
finding largest output (and if output consumes more than one byte of input
average rounding up), pad each output to the largest output times number of
bytes input consumed.