File: read.s

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;
; jede jede@oric.org 2017-01-22
;

    .export         _read

    .import         popax

    .include        "zeropage.inc"
    .include        "telestrat.inc"

;int read (int fd, void* buf, unsigned count);

.proc   _read
    sta     ptr1 ; count
    stx     ptr1+1 ; count
    jsr     popax ; get buf

    sta     PTR_READ_DEST
    stx     PTR_READ_DEST+1
    sta     ptr2 ; in order to calculate nb of bytes read
    stx     ptr2+1 ;

    ; jsr popax ; fp pointer don't care in this version

    lda     ptr1 ;
    ldy     ptr1+1 ;
    BRK_TELEMON     XFREAD ; calls telemon30 routine
    ;  compute nb of bytes read
    lda     PTR_READ_DEST+1
    sec
    sbc     ptr2+1
    tax
    lda     PTR_READ_DEST
    sec
    sbc     ptr2
    ; Here A and X contains number of bytes read
    rts
.endproc