collapseos/blk/449
2020-04-25 21:54:07 -04:00

12 lines
218 B
Plaintext

( returns negative value on error )
: _ ( c -- n )
( '0' is ASCII 48 )
48 -
DUP 0< IF EXIT THEN ( bad )
DUP 2 < IF EXIT THEN ( good )
( bad )
255 -
;