mirror of
https://github.com/cc65/cc65.git
synced 2024-12-28 06:30:16 +00:00
44 lines
650 B
ArmAsm
44 lines
650 B
ArmAsm
;
|
|
; common iocb setup routine for read, write
|
|
; expects __fastcall__ parameters (int fd, void *buf, int count)
|
|
;
|
|
.include "atari.inc"
|
|
.include "errno.inc"
|
|
.import popax
|
|
.import fdtoiocb
|
|
|
|
.export __rwsetup
|
|
|
|
|
|
__rwsetup:
|
|
|
|
pha ; push size in stack
|
|
txa
|
|
pha
|
|
jsr popax ; get buffer address
|
|
pha
|
|
txa
|
|
pha
|
|
jsr popax ; get handle
|
|
jsr fdtoiocb ; convert to iocb
|
|
bmi iocberr ; negative (X=$FF or A>$7F) on error.
|
|
tax
|
|
pla ; store address
|
|
sta ICBAH,x
|
|
pla
|
|
sta ICBAL,x
|
|
pla ; store length
|
|
sta ICBLH,x
|
|
pla
|
|
sta ICBLL,x
|
|
ora ICBLH,x ; returns Z if length is 0
|
|
rts
|
|
|
|
iocberr:pla
|
|
pla
|
|
pla
|
|
pla
|
|
ldx #$FF ; indicate error + clear ZF
|
|
rts
|
|
|