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84 lines
1.7 KiB
ArmAsm
84 lines
1.7 KiB
ArmAsm
;
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; jede jede@oric.org 2017-01-22
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.export _write
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.import popax, popptr1
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.importzp ptr1, ptr2, ptr3, tmp1
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.include "telestrat.inc"
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; int write (int fd, const void* buf, int count);
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.proc _write
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sta ptr3
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stx ptr3+1 ; save count as result
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inx
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stx ptr2+1
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tax
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inx
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stx ptr2 ; save count with each byte incremented separately
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jsr popptr1 ; get buf
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jsr popax ; get fd and discard
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; if fd=0001 then it stdout
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cpx #0
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beq next
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jmp L1
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next:
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cmp #1
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beq L1
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; here it's a file opened
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lda ptr1
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sta PTR_READ_DEST
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lda ptr1+1
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sta PTR_READ_DEST+1
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lda ptr3
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ldy ptr3+1
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BRK_TELEMON XFWRITE
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; compute nb of bytes written
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lda PTR_READ_DEST+1
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sec
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sbc ptr1+1
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tax
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lda PTR_READ_DEST
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sec
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sbc ptr1
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rts
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L1: dec ptr2
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bne L2
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dec ptr2+1
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beq L9
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L2: ldy #0
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lda (ptr1),y
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tax
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cpx #$0A ; check for \n
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bne L3
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BRK_TELEMON XWR0 ; macro send char to screen (channel 0 in telemon terms)
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lda #$0D ; return to the beggining of the line
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BRK_TELEMON XWR0 ; macro
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ldx #$0D
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L3:
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BRK_TELEMON XWR0 ; macro
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inc ptr1
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bne L1
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inc ptr1+1
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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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