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52 lines
1.2 KiB
ArmAsm
52 lines
1.2 KiB
ArmAsm
;
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; Wayne Parham (wayne@parhamdata.com)
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; int __fastcall__ write (int fd, const void* buf, int count);
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;
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.include "sym1.inc"
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.import popax, popptr1
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.importzp ptr1, ptr2, ptr3
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.export _write
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.proc _write
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sta ptr3
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stx ptr3+1 ; Count in ptr3
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inx
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stx ptr2+1 ; Increment and store in ptr2
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tax
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inx
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stx ptr2
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jsr popptr1 ; Buffer address in ptr1
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jsr popax
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begin: dec ptr2
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bne outch
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dec ptr2+1
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beq done
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outch: ldy #0
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lda (ptr1),y
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jsr OUTCHR ; Send character using Monitor call
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cmp #$07 ; Check for '\a'
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bne chklf ; ...if BEL character
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jsr BEEP ; Make beep sound
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chklf: cmp #$0A ; Check for 'n'
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bne next ; ...if LF character
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lda #$0D ; Add a carriage return
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jsr OUTCHR
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next: inc ptr1
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bne begin
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inc ptr1+1
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jmp begin
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done: lda ptr3
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ldx ptr3+1
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rts ; Return count
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.endproc
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