A2osX/SBIN/SHELL.S.HIS.txt

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PR#3
PREFIX /A2OSX.BUILD
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NEW
INC 1
AUTO 6
.LIST OFF
*--------------------------------------
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HIS.Init >PUSHWI 256 Get a buffer for History
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>PUSHBI S.MEM.F.INIT0
>SYSCALL GetMem
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bcs .9
txa
ldy #hCmdHistory
sta (pData),y
lda #0
ldy #CmdHistory.IDX
sta (pData),y
ldy #CmdHistory.END
sta (pData),y
.9 rts
*--------------------------------------
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HIS.Add ldy #hCmdHistory
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lda (pData),y
beq .9
>SYSCALL GetMemPtrA
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>STYA ZPPTR1
.10 ldy #CmdHistory.END
lda (pData),y
sec add len+1
adc (pData) CmdBuffer length
bcc .2 enough room
lda (ZPPTR1) get len of oldest string
sec
adc ZPPTR1
sta ZPPTR2
lda ZPPTR1+1
adc #0
sta ZPPTR2+1
ldy #$FF
.1 iny
lda (ZPPTR2),y move back until ending 0 found
sta (ZPPTR1),y
bne .1
tya
ldy #CmdHistory.END mark new end of history
sta (pData),y
bra .10 retry....
.2 tax keep new CmdHistory.END
tay
lda #0
sta (ZPPTR1),y set ending 0
ldy #CmdHistory.END save old END
lda (pData),y
pha
txa get back new END
ldy #CmdHistory.IDX set it as new IDX
sta (pData),y
ldy #CmdHistory.END
sta (pData),y set new CmdHistory.END
pla get back old END
clc
adc ZPPTR1
sta ZPPTR1
bcc .3
inc ZPPTR1+1
.3 lda (pData)
tay
.4 lda (pData),y
sta (ZPPTR1),y
dey
bpl .4
.9 rts
*--------------------------------------
HIS.GetPrev ldy #hCmdHistory
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lda (pData),y
beq HISTORY.RTS
tax
ldy #CmdHistory.END
lda (pData),y
beq HISTORY.RTS empty history,nothing to do
ldy #CmdHistory.IDX
lda (pData),y
beq HISTORY.RTS already oldest,nothing to do
txa
>SYSCALL GetMemPtrA
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>STYA ZPPTR1
lda #0
.1 tax
tay
sec
adc (ZPPTR1),y
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bcs History.RTS out of buffer
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ldy #CmdHistory.IDX
cmp (pData),y
bne .1 reached current index
.2 txa
ldy #CmdHistory.IDX set new index
sta (pData),y
bra HIS.SetBuf
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History.RTS rts
*--------------------------------------
HIS.GetNext ldy #hCmdHistory
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lda (pData),y
beq HISTORY.RTS
tax
ldy #CmdHistory.END
lda (pData),y
beq HISTORY.RTS empty history,nothing to do
ldy #CmdHistory.IDX
cmp (pData),y
beq HISTORY.RTS already oldest,nothing to do
txa
>SYSCALL GetMemPtrA
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>STYA ZPPTR1
ldy #CmdHistory.IDX
lda (pData),y
phy
tay
sec
adc (ZPPTR1),y add length+1 of current line in history
ply
sta (pData),y
ldy #CmdHistory.END
cmp (pData),y
bne HIS.SetBuf
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jmp CmdBuffer.CLR end of history, just blank buffer
*--------------------------------------
HIS.SetBuf jsr CmdBuffer.CLR
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ldy #CmdHistory.IDX
lda (pData),y
tay keep length of string
clc
adc ZPPTR1
sta ZPPTR1
bcc .1
inc ZPPTR1+1
.1 lda (ZPPTR1),y
sta (pData),y
dey
bpl .1
>LDYA pData
>SYSCALL PPrintfYA
rts
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*--------------------------------------
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HIS.Quit ldy #hCmdHistory
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lda (pData),y
beq .9
>SYSCALL FreeMemA
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.9 rts
*--------------------------------------
MAN
SAVE /A2OSX.SRC/SBIN/SHELL.S.HIS
LOAD /A2OSX.SRC/SBIN/SHELL.S
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ASM