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85 lines
1.8 KiB
ArmAsm
85 lines
1.8 KiB
ArmAsm
;
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; 2014-08-22, Greg King
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;
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; int read (int fd, void* buf, unsigned count);
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;
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; This function is a hack! It lets us get text from the stdin console.
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;
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.export _read
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.constructor initstdin
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.import popax, popptr1
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.importzp ptr1, ptr2, ptr3
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.forceimport disable_caps
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.macpack generic
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.include "atmos.inc"
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.proc _read
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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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L1: dec ptr2
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bnz L2
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dec ptr2+1
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bze L9 ; no more room in buf
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; If there are no more characters in BASIC's input buffer, then get a line from
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; the console into that buffer.
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L2: ldx text_count
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bpl L3
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jsr GETLINE
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ldx #<(0 - 1)
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L3: inx
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lda BASIC_BUF,x
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bnz L4 ; (zero-terminated buffer)
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ldx #<-1
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lda #$0A ; return newline char. at end of line
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L4: stx text_count
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ldy #0
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sta (ptr1),y
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inc ptr1
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bnz L1
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inc ptr1+1
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bnz L1 ; branch always
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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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;--------------------------------------------------------------------------
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; initstdin: Reset the stdin console.
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.segment "ONCE"
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initstdin:
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ldx #<-1
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stx text_count
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rts
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;--------------------------------------------------------------------------
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.segment "INIT"
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text_count:
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.res 1
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