mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-30 22:18:06 +11:00
16 lines
471 B
Plaintext
16 lines
471 B
Plaintext
|
( r c -- r f )
|
||
|
|
( Parse digit c and accumulate into result r.
|
||
|
|
Flag f is 0 when c was a valid digit, 1 when c was WS,
|
||
|
|
-1 when c was an invalid digit. )
|
||
|
|
: _pdacc
|
||
|
|
DUP 0x21 < IF DROP 1 EXIT THEN
|
||
|
|
( parse char )
|
||
|
|
'0' -
|
||
|
|
( if bad, return "r -1" )
|
||
|
|
DUP 0< IF DROP -1 EXIT THEN ( bad )
|
||
|
|
DUP 9 > IF DROP -1 EXIT THEN ( bad )
|
||
|
|
( good, add to running result )
|
||
|
|
SWAP 10 * + ( r*10+n )
|
||
|
|
0 ( good )
|
||
|
|
;
|