1
0
mirror of https://github.com/hsoft/collapseos.git synced 2024-12-26 05:48:06 +11:00
collapseos/blk/291
Virgil Dupras a6e987b5f7 z80: protect BC in _find
In preparation for the IY->BC move
2020-07-05 22:43:32 -04:00

17 lines
686 B
Plaintext

( Native words )
H@ 4 + XCURRENT ! ( make next CODE have 0 prev field )
CODE _find ( cur w -- a f )
HL POP, ( w ) DE POP, ( cur ) chkPS,
HL PUSH, ( --> lvl 1 )
( First, figure out string len )
A (HL) LDrr, A ORr,
( special case. zero len? we never find anything. )
IFZ, PUSH0, JPNEXT, THEN,
BC PUSH, ( --> lvl 2, protect )
( Let's do something weird: We'll hold HL by the *tail*.
Because of our dict structure and because we know our
lengths, it's easier to compare starting from the end. )
C A LDrr, B 0 LDri, ( C holds our length )
BC ADDHLd, HL INCd, ( HL points to after-last-char )
( cont . )