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51 lines
837 B
ArmAsm
51 lines
837 B
ArmAsm
;
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; Ullrich von Bassewitz, 30.05.1998
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;
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; int read (int fd, void* buf, int count);
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;
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; THIS IS A HACK!
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;
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.export _read
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.import popax, _cputc, RDKEY
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.importzp ptr1, ptr2, ptr3
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_read: jsr popax ; get count
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sta ptr2
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stx ptr2+1 ; save it for later
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jsr popax ; get buf
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sta ptr1
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stx ptr1+1
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jsr popax ; get fd and discard it
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lda #$00
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sta ptr3
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sta ptr3+1 ; set count
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L1: lda ptr2
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ora ptr2+1 ; count zero?
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beq L9
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jsr RDKEY
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and #$7F ; clear high bit.
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pha
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jsr _cputc
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pla
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ldy #$00 ; offset into string
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sta (ptr1),y ; save char
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inc ptr1
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bne L2
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inc ptr1+1
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L2: inc ptr3 ; increment count
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bne L3
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inc ptr3+1
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L3: cmp #$0D ; CR?
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bne L1
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; Done, return the count
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L9: lda ptr3
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ldx ptr3+1
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rts
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