A2osX/SBIN/SHELL.S.HIS.txt

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PR#3
PREFIX /A2OSX.BUILD
LOMEM $A00
INC 1
AUTO 6
.LIST OFF
*--------------------------------------
HIS.Init >LDYAI History.MAX Get a buffer for History
>SYSCALL GetMem0.YA
bcs .9
txa
>STA.G HIS.hBuf
lda #0
>STA.G HIS.Count
>STA.G HIS.Index
.9 rts
*--------------------------------------
HIS.Add >LDA.G HIS.hBuf
beq .9
>SYSCALL GetMemPtr.A
>STYA ZPPTR1
.10 lda #$ff
jsr HIS.GetA Y=ending 0
phy
tya
sec add len+1
>ADC.G CmdBuflen CmdBuffer length
pla
bcc .2 enough room
ldy #$ff we must remove oldest
.12 iny
lda (ZPPTR1),y get len of oldest string
bne .12
tya
* sec
adc ZPPTR1
sta ZPPTR2
lda ZPPTR1+1
adc #0
sta ZPPTR2+1
ldy #$FF
.1 iny
lda (ZPPTR2),y move back until String ending 0 found
sta (ZPPTR1),y
bne .1
iny
lda (ZPPTR2),y move back until Array ending 0 found
sta (ZPPTR1),y
bne .1
>DEC.G HIS.Count
bra .10 retry....
.2 clc A = ending O offset
adc ZPPTR1
sta ZPPTR1
bcc .3
inc ZPPTR1+1
.3 ldy #$ff
.4 iny
lda (ZPCMDBuf),y
sta (ZPPTR1),y
bne .4
iny
sta (ZPPTR1),y set new array ending 0
* lda #0
>STA.G HIS.Index Reset Index
>INC.G HIS.Count
.9 rts
*--------------------------------------
HIS.GetPrev >LDA.G HIS.hBuf
beq HISTORY.RTS
>SYSCALL GetMemPtr.A
>STYA ZPPTR1
>LDA.G HIS.Count
beq HISTORY.RTS empty history,nothing to do
>LDA.G HIS.Index
bne .1
>LDA.G HIS.Count
.1 dec
>STA.G HIS.Index
bra HIS.SetA
History.RTS rts
*--------------------------------------
HIS.GetNext >LDA.G HIS.hBuf
beq HISTORY.RTS
>SYSCALL GetMemPtr.A
>STYA ZPPTR1
>LDA.G HIS.Count
beq HISTORY.RTS empty history,nothing to do
>LDA.G HIS.Index
inc
>CMP.G HIS.Count
bne .1
lda #0
>STA.G HIS.Index
jmp CL.CLR
.1 >STA.G HIS.Index
*--------------------------------------
HIS.SetA jsr HIS.GetA
tya
clc
adc ZPPTR1
sta ZPPTR1
bcc .1
inc ZPPTR1+1
.1 jsr CL.CLR
ldy #$ff
.2 iny
lda (ZPPTR1),y
sta (ZPCMDBuf),y
bne .2
tya
>STA.G CmdBufPtr
>STA.G CmdBuflen
jmp CL.PRINT
*--------------------------------------
HIS.GetA ldy #0
tax
beq .80
lda (ZPPTR1),y
beq .9
.1 iny
lda (ZPPTR1),y
bne .1
dex
beq .8
iny
lda (ZPPTR1),y
bne .1
.9 sec Found ending 0....
rts
.8 iny
.80 clc
rts
*--------------------------------------
HIS.Quit >LDA.G HIS.hBuf
beq .9
>SYSCALL FreeMem.A
.9 rts
*--------------------------------------
MAN
SAVE /A2OSX.SRC/SBIN/SHELL.S.HIS
LOAD /A2OSX.SRC/SBIN/SHELL.S
ASM