mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-06 08:10:55 +11:00
17 lines
532 B
Plaintext
17 lines
532 B
Plaintext
|
( returns negative value on error )
|
||
|
|
: _ ( c -- n )
|
||
|
|
DUP '0' '9' =><= IF '0' - EXIT THEN
|
||
|
|
DUP 'a' 'f' =><= IF 0x57 ( 'a' - 10 ) - EXIT THEN
|
||
|
|
DROP -1 ( bad )
|
||
|
|
;
|
||
|
|
: _ph ( a -- n f, parse hex )
|
||
|
|
( '0': ASCII 0x30 'x': 0x78 0x7830 )
|
||
|
|
DUP 1+ @ 0x7830 = NOT IF 0 EXIT THEN ( a 0 )
|
||
|
|
( We have "0x" prefix )
|
||
|
|
DUP C@ ( a len )
|
||
|
|
0 SWAP 1+ ( len+1 ) 3 DO ( a r )
|
||
|
|
OVER I + C@ ( a r c ) _ ( a r n )
|
||
|
|
DUP 0< IF 2DROP 0 UNLOOP EXIT THEN
|
||
|
|
SWAP 4 LSHIFT + ( a r*16+n ) LOOP
|
||
|
|
NIP 1 ;
|