Write the shortest possible code which converts tabs to spaces in the input. Tab size should be supplied as a parameter or be hardcoded in the code in a single place.
Spaces on output should point to the right column, e.g. (
\t represents a tab character):
a\tb aa\tb aaa\tb aaaa\tb
should become (for tab size 4):
a b aa b aaa b aaaa b
Of course there can be more than one tab in a line.
Line separator and tab character should match the system defaults (e.g. ASCII 10 and 9 on Unix).