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170 lines
3.1 KiB
Plaintext
170 lines
3.1 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 256 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.BufIndex
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>STA.G HIS.BufEnd
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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.G HIS.BufEnd
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.11 sec add len+1
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adc CmdBuflen CmdBuffer length
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bcc .2 enough room
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lda (ZPPTR1) get len of oldest string
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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 ending 0 found
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sta (ZPPTR1),y
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bne .1
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tya
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>STA.G HIS.BufEnd mark new end of history
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bra .11 retry....
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.2 tax keep new HIS.BufEnd
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tay
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lda #0
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sta (ZPPTR1),y set ending 0
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>LDA.G HIS.BufEnd save old END
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pha
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txa get back new END
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>STA.G HIS.BufIndex set it as new IDX
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>STA.G HIS.BufEnd set new HIS.BufEnd
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pla get back old END
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clc
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adc ZPPTR1
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sta ZPPTR1
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bcc .3
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inc ZPPTR1+1
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.3 ldy #0
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.4 lda (ZPCMDBuf),y
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beq .5
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iny
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sta (ZPPTR1),y
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iny
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bra .4
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.5 tya
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sta (ZPPTR1)
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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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tax
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>LDA.G HIS.BufEnd
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beq HISTORY.RTS empty history,nothing to do
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>LDA.G HIS.BufIndex
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beq HISTORY.RTS already oldest,nothing to do
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txa
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>SYSCALL GetMemPtr.A
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>STYA ZPPTR1
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lda #0
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.1 tax
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tay
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sec
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adc (ZPPTR1),y
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bcs History.RTS out of buffer
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ldy #HIS.BufIndex
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cmp (pData),y
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bne .1 reached current index
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.2 txa
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>STA.G HIS.BufIndex set new index
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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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tax
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>LDA.G HIS.BufEnd
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beq HISTORY.RTS empty history,nothing to do
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>CMP.G HIS.BufIndex
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beq HISTORY.RTS already oldest,nothing to do
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txa
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>SYSCALL GetMemPtr.A
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>STYA ZPPTR1
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>LDA.G HIS.BufIndex
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tay
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sec
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adc (ZPPTR1),y add length+1 of current line in history
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>STA.G HIS.BufIndex
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>CMP.G HIS.BufEnd
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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.SetBuf jsr CmdLine.CLR
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>LDA.G HIS.BufIndex
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tay keep length of string
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clc
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adc ZPPTR1
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sta ZPPTR1
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bcc .1
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inc ZPPTR1+1
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.1 lda (ZPPTR1),y
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sta (ZPCMDBuf),y
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dey
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bpl .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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