; 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 __oserror
- .import fdtoiocb
+ .include "atari.inc"
+ .include "errno.inc"
+ .import popax
+ .import fdtoiocb
- .export __rwsetup
+ .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>$7F) on error.
- tax
- pla ; store address
- sta ICBAH,x
- pla
- sta ICBAL,x
- pla ; store length
- sta ICBLH,x
- pla
- sta ICBLL,x
- ora ICBLH,x ; returns Z if length is 0
- rts
+ pha ; push size in stack
+ txa
+ pha
+ jsr popax ; get buffer address
+ pha
+ txa
+ pha
+ jsr popax ; get handle
+ jsr fdtoiocb ; convert to iocb
+ bmi iocberr ; negative (X=$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
+ pla
+ pla
+ pla
+ ldx #$FF ; indicate error + clear ZF
+ rts
-;
-; this routine updates errno. do a JMP here right after calling
-; CIOV. we expect status in Y.
-;
- .export __do_oserror,__inviocb
-__do_oserror:
- sty __oserror ; save os dependent error code
-retminus:
- lda #$FF
- tax ; return -1
- rts
-
-;
-; sets EINVAL error code and returns -1
-;
-
-__inviocb:
- lda #<EINVAL
- jsr __seterrno
- jmp retminus ; return -1