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72 lines
1.2 KiB
ArmAsm
72 lines
1.2 KiB
ArmAsm
;
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; common iocb setup routine for read, write
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; expects __fastcall__ parameters (int fd, void *buf, int count)
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;
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.include "atari.inc"
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.include "errno.inc"
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.importzp tmp2,tmp3
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.import incsp4,ldax0sp,ldaxysp
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.import __errno,__oserror
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.import fdtoiocb
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.export __rwsetup
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__rwsetup:
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sta tmp2
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stx tmp3 ; remember size
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ldy #3
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jsr ldaxysp ; get fd
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jsr fdtoiocb ; convert to iocb
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bmi iocberr
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tax
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cpx #$80 ; iocb must be 0...7
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bcs iocberr
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lda tmp2
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sta ICBLL,x
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lda tmp3 ; size hi
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sta ICBLH,x
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stx tmp3
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jsr ldax0sp ; get buf addr
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stx tmp2
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ldx tmp3
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sta ICBAL,x
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lda tmp2
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sta ICBAH,x
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jsr incsp4 ; pop args
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lda ICBLL,x
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ora ICBLH,x ; return with Z if length was 0
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rts
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iocberr:jsr incsp4 ; pop args
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ldx #$FF ; indicate error + clear ZF
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rts
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;
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; this routine updates errno. do a JMP here right after calling
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; CIOV. we expect status in Y.
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;
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.export __do_oserror,__seterrno,__inviocb
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__do_oserror:
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sty __oserror ; save os dependent error code
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retminus:
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lda #$FF
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tax ; return -1
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rts
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__seterrno:
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sta __errno
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stx __errno+1
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rts
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;
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; sets EINVAL error code and returns -1
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;
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__inviocb:
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lda #<EINVAL
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ldx #>EINVAL
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jsr __seterrno
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jmp retminus ; return -1
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