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53 lines
737 B
ArmAsm
53 lines
737 B
ArmAsm
;;
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;; Kevin Ruland
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;;
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;; int write (int fd, const void* buf, int count);
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;;
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;; for now will only write to fd = stdout
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;;
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.export _write
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.import popax, COUT
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.importzp ptr1, ptr2, ptr3
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.proc _write
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sta ptr2 ; Save count for later
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stx ptr2+1
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sta ptr3
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sta ptr3+1 ; save for result
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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
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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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ldy #$00
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lda (ptr1),y
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cmp #$0A ; Check for \n = Crtl-j
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bne rawout
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lda #$0D ; Issue cr
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rawout:
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ora #$80
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jsr COUT
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inc ptr1
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bne L2
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inc ptr1+1
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L2: lda ptr2
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bne L3
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dec ptr2
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dec ptr2+1
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jmp L1
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L3: dec ptr2
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jmp L1
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; No error, return count
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L9: lda ptr3
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ldx ptr3+1
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rts
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.endproc
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