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176 lines
3.0 KiB
Plaintext
176 lines
3.0 KiB
Plaintext
PR#3
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PREFIX /A2OSX.BUILD
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LOMEM $A00
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INC 1
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AUTO 6
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.LIST OFF
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*--------------------------------------
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HIS.Init >LDYAI History.MAX Get a buffer for History
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>SYSCALL GetMem0.YA
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bcs .9
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txa
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>STA.G HIS.hBuf
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lda #0
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>STA.G HIS.Count
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>STA.G HIS.Index
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.9 rts
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*--------------------------------------
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HIS.Add >LDA.G HIS.hBuf
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beq .9
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>SYSCALL GetMemPtr.A
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>STYA ZPPTR1
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.10 lda #$ff
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jsr HIS.GetA Y=ending 0
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tya
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sec add len+1
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adc CmdBuflen CmdBuffer length
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bcc .2 enough room
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>DEC.G HIS.Count we must remove oldest
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ldy #$ff
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.12 iny
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lda (ZPPTR1),y get len of oldest string
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bne .12
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tya
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* sec
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adc ZPPTR1
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sta ZPPTR2
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lda ZPPTR1+1
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adc #0
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sta ZPPTR2+1
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ldy #$FF
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.1 iny
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lda (ZPPTR2),y move back until String ending 0 found
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sta (ZPPTR1),y
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bne .1
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iny
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lda (ZPPTR2),y move back until Array ending 0 found
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sta (ZPPTR1),y
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bne .1
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bra .10 retry....
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.2 tya Y=Array Ending 0
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sec
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adc ZPPTR1
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sta ZPPTR2
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lda ZPPTR1+1
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adc #0
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sta ZPPTR2+1
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.3 ldy #$ff
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.4 iny
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lda (ZPCMDBuf),y
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sta (ZPPTR1),y
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bne .4
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iny
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sta (ZPPTR1),y set new array ending 0
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* lda #0
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>STA.G HIS.Index Reset Index
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>INC.G HIS.Count
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.9 rts
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*--------------------------------------
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HIS.GetPrev >LDA.G HIS.hBuf
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beq HISTORY.RTS
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>SYSCALL GetMemPtr.A
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>STYA ZPPTR1
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>LDA.G HIS.Count
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beq HISTORY.RTS empty history,nothing to do
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>LDA.G HIS.Index
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bne .1
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>LDA.G HIS.Count
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.1 dec
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>STA.G HIS.Index
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jsr HIS.GetA
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bra HIS.SetBuf
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History.RTS rts
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*--------------------------------------
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HIS.GetNext >LDA.G HIS.hBuf
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beq HISTORY.RTS
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>SYSCALL GetMemPtr.A
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>STYA ZPPTR1
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>LDA.G HIS.Count
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beq HISTORY.RTS empty history,nothing to do
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>LDA.G HIS.Index
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inc
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>CMP.G HIS.Count
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bne .1
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lda #0
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.1 >STA.G HIS.Index
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jsr HIS.GetA
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bne HIS.SetBuf
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jmp CmdLine.CLR end of history, just blank buffer
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*--------------------------------------
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HIS.GetA tax
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beq .8
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ldy #0
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lda (ZPPTR1),y
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beq .9
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.1 iny
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lda (ZPPTR1),y
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bne .1
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dex
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beq .8
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iny
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lda (ZPPTR1),y
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bne .1
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.9 sec Found ending 0....
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rts
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.8 clc
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rts
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*--------------------------------------
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HIS.SetBuf jsr CmdLine.CLR
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ldy #$ff
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.1 lda (ZPPTR1),y
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sta (ZPCMDBuf),y
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bne .1
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jmp CmdLine.PRINT
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*--------------------------------------
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HIS.Quit >LDA.G HIS.hBuf
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beq .9
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>SYSCALL FreeMem.A
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.9 rts
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*--------------------------------------
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MAN
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SAVE /A2OSX.SRC/SBIN/SHELL.S.HIS
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LOAD /A2OSX.SRC/SBIN/SHELL.S
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ASM
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