A2osX/SYS/KERNEL.S.ENV.txt

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PR#3
PREFIX /A2OSX.SRC
NEW
INC 1
AUTO 6
.LIST OFF
*--------------------------------------
* K.ExpandPStrYA
* In:
* Y,A = PTR to String to Expand (PSTRING)
* Out:
* X = hMem to Expanded String (PSTRING)
* Y,A = PTR to Expanded String
*--------------------------------------
K.ExpandPStrYA
>STYA ZPQuickPtr3
stz KrnBuf256 init Expanded String len=0
ldy #0
.10 stz K.ExpandPStr.Start
.1 tya
cmp (ZPQuickPtr3) End of PSTR?
beq .6
iny
lda (ZPQuickPtr3),y
ldx K.ExpandPStr.Start
bne .3 already in a var?
cmp #'$' no, found one ?
beq .2
inc KrnBuf256 no, copy char
ldx KrnBuf256
sta KrnBuf256,x
bra .1
.2 sty K.ExpandPStr.Start save var start
stz K.ExpandPStr.End
bra .1 skip this char
.3 cmp #'{' in var, "{" after "$"?
beq .2
cmp #'}' end of var?
beq .5
.4 jsr K.ExpandPStr.VC valid char ?
bcs .5 no, end here
sty K.ExpandPStr.End yes, save end
bra .1
.5 lda K.ExpandPStr.End get end
beq .1 empty {} or $/
phy save current index
jsr K.ExpandPStr.AV
ply restore index in string...
bra .10 reset start flag and continue
.6 sty K.ExpandPStr.End end of PSTR
lda K.ExpandPStr.Start are we in a var?
beq .7 no...exit...
jsr K.ExpandPStr.AV yes, expand and add to STR
.7 >LDYAI KrnBuf256
jsr K.NewPStrYA
rts
*--------------------------------------
K.ExpandPStr.AV lda K.ExpandPStr.End
sec
sbc K.ExpandPStr.Start compute len of VAR End-Start+1
ldx KrnBuf256
inx
sta KrnBuf256,x
stx ZPQuickPtr2
lda /KrnBuf256
sta ZPQuickPtr2+1
ldy K.ExpandPStr.Start
.1 iny
inx
lda (ZPQuickPtr3),y
sta KrnBuf256,x
cpy K.ExpandPStr.End
bne .1
jsr ENV.CheckSysVarPtr2
bcs .10
>STYA ZPQuickPtr1
bra .11
.10 jsr ENV.FindVarPtr2
bcs .9
jsr ENV.NextEnvPtr1 Skip NAME
.11 ldy #0
ldx KrnBuf256
.2 iny
lda (ZPQuickPtr1),y
inx
sta KrnBuf256,x
tya
cmp (ZPQuickPtr1) last char?
bne .2
stx KrnBuf256
.9 rts
*--------------------------------------
K.ExpandPStr.VC cmp #'0'
bcc .9
cmp #'9'+1
bcc .8
cmp #'A'
bcc .9
cmp #'Z'+1
bcc .8
cmp #'_'
bne .9
.8 clc
rts
.9 sec
rts
*--------------------------------------
K.ExpandPStr.Start .BS 1
K.ExpandPStr.End .BS 1
*--------------------------------------
* K.PutEnvYA
*--------------------------------------
K.PutEnvYA >STYA ZPQuickPtr2 NAME=VALUE
lda (ZPQuickPtr2)
beq .9
sta KrnBuf256
tay
.1 lda (ZPQuickPtr2),y
sta KrnBuf256,y
dey
bne .1
ldy #0
.2 iny
cpy KrnBuf256 last char ?
beq .9 no "=" found
lda KrnBuf256,y
cmp #'='
bne .2
cpy #1 String like "=value" ?
beq .9
cpy KrnBuf256 last char ?
beq .9 we have "VAR="
lda KrnBuf256 save actual string len
sty KrnBuf256 set length of VAR string
dec KrnBuf256 ...without "="
.3 clc Substract VAR len+1 from whole len to get
sbc KrnBuf256 VALUE len
sta KrnBuf256,y save it at "=" POS
tya
clc
adc #KrnBuf256
sta ZPQuickPtr3
lda /KrnBuf256
sta ZPQuickPtr3+1
>LDYAI KrnBuf256
>STYA ZPQuickPtr2
bra K.SetEnvPtr2Ptr3
.9 sec
rts
*--------------------------------------
* K.SetEnv
* In:
* PULLW = PTR To Name (PSTRING)
* PULLW = PTR To Value (PSTRING)
* Out:
*--------------------------------------
K.SetEnv >PULLW ZPQuickPtr2 NAME...
>PULLW ZPQuickPtr3 ...VALUE
K.SetEnvPtr2Ptr3
jsr S.UnsetEnvPtr2
jsr ENV.InitEnvPtr1 Y,A = ZPQuickPtr1 -> Env
lda ZPQuickPtr1 Compute ENV UPPER LIMIT in Ptr4
clc
adc #K.ENV.SIZE
sta ZPQuickPtr4
lda ZPQuickPtr1+1
adc /K.ENV.SIZE
sta ZPQuickPtr4+1
ldy ZPQuickPtr1+1
lda ZPQuickPtr1 Compute New Env Upper limit in A,Y
sec
adc (ZPQuickPtr2) add NAME len +1
bcc .1
iny
.1 sec
adc (ZPQuickPtr3) add VALUE len +1
bcc .2
iny
.2 cmp ZPQuickPtr4 GE than hMem Upper limit ?
tya
sbc ZPQuickPtr4+1
bcs .99
.3 lda (ZPQuickPtr1) Scan until endig 0...
beq .4
inc ZPQuickPtr1
bne .3
inc ZPQuickPtr1+1
bne .3
.4 lda (ZPQuickPtr2)
sta (ZPQuickPtr1)
tay
.5 lda (ZPQuickPtr2),y
sta (ZPQuickPtr1),y
dey
bne .5
jsr ENV.NextEnvPtr1
lda (ZPQuickPtr3)
sta (ZPQuickPtr1)
tay
.6 lda (ZPQuickPtr3),y
sta (ZPQuickPtr1),y
dey
bne .6
jsr ENV.NextEnvPtr1
.8 lda #0
sta (ZPQuickPtr1)
clc
rts
.99 lda #SYSMGR.ERRENVF
sec
rts
*--------------------------------------
* K.GetEnvYA
* In:
* Y,A = PTR to NAME (PSTRING)
* Out:
* CC : Y,A = PTR to VALUE (PSTRING)
* CS : not found
*--------------------------------------
K.GetEnvYA >STYA ZPQuickPtr2
jsr ENV.CheckSysVarPtr2
bcc .9
jsr ENV.FindVarPtr2
bcs .9
jsr ENV.NextEnvPtr1 Skip NAME
>LDYA ZPQuickPtr1
clc just in case ADC in NextEnvPtr1 disturb CC
.9 rts
*--------------------------------------
* K.UnsetEnvYA
* In:
* YA = PTR To Name (PSTRING)
* Out:
*--------------------------------------
K.UnsetEnvYA >STYA ZPQuickPtr2 Store VAR Name
S.UnsetEnvPtr2 jsr ENV.FindVarPtr2
bcs .8 not found, quit
jsr ENV.DiscardVarPtr1 Ptr1 -> ENVNAME
.8 clc
rts
*--------------------------------------
* PRIVATE
*--------------------------------------
* ENV.CheckSysVarPtr2
* In:
* ZPQuickPtr2 -> NAME
* Out:
* CC: Found
* YA -> VALUE
* CS: Not Found
*--------------------------------------
ENV.CheckSysVarPtr2
lda (ZPQuickPtr2)
cmp #1 is name 1 char?
bne .9
ldy #1
lda (ZPQuickPtr2),y
cmp #'0' $0...$9 ??
bcc .1 no,
cmp #'9'+1
bcs .99
and #$0F
jmp K.GetArgA
.1 cmp #'*' $* : All ARGS
bne .9
cmp #'#' $# : ARGC
bne .9
cmp #'?' $? : RC
bne .9
cmp #'$' $$ : PID
bne .9
.9 sec
.99 rts
*--------------------------------------
* ENV.FindVarPtr2
* In:
* ZPQuickPtr2 -> NAME
* Out:
* CC: Found
* ZPQuickPtr1 -> ENV.NAME
* ZPQuickPtr2 -> NAME
* CS: Not Found
* ZPQuickPtr1 -> PTR to Ending 0
* ZPQuickPtr2 -> NAME
*--------------------------------------
ENV.FindVarPtr2 jsr ENV.InitEnvPtr1 Store ENV
bcs .99
lda (ZPQuickPtr1)
beq .9 end of ENV
.1 cmp (ZPQuickPtr2) Same len as NAME?
bne .3
tay
.2 lda (ZPQuickPtr1),y
cmp (ZPQuickPtr2),y
bne .3
dey
bne .2
clc
rts
.3 jsr ENV.NextEnvPtr1 Skip NAME
jsr ENV.NextEnvPtr1 Skip VALUE
lda (ZPQuickPtr1)
bne .1
.9 sec
.99 rts
*--------------------------------------
* ENV.DiscardVarPtr1
* In:
* ZPQuickPtr1 -> ENV.NAME to Discard
*--------------------------------------
ENV.DiscardVarPtr1
lda ZPQuickPtr1 Discard current NAME & VALUE definition
sec ZPQuickPtr1 -> NAME
adc (ZPQuickPtr1) add NAME+1 to ZPQuickPtr1
sta ZPQuickPtr4 store it in ZPQuickPtr4
lda #0
adc ZPQuickPtr1+1
sta ZPQuickPtr4+1
lda ZPQuickPtr4 add VALUE+1 to ZPQuickPtr4
sec
adc (ZPQuickPtr4)
sta ZPQuickPtr4
bcc .1
inc ZPQuickPtr4+1
.1 ldy #0
.2 lda (ZPQuickPtr4),y Move back tail...
sta (ZPQuickPtr1),y
beq .8 ...until we move ending 0
iny
bne .2
inc ZPQuickPtr1+1
inc ZPQuickPtr4+1
bra .2
.8 rts
*--------------------------------------
ENV.InitEnvPtr1 ldy #S.PS.hENV
lda (pPs),y
jsr K.GetMemPtrA
>STYA ZPQuickPtr1 Store ENV
rts
*--------------------------------------
ENV.NextEnvPtr1 lda ZPQuickPtr1
sec
adc (ZPQuickPtr1)
sta ZPQuickPtr1
bcc .8
inc ZPQuickPtr1+1
.8 rts
*--------------------------------------
MAN
SAVE SYS/KERNEL.S.ENV
LOAD SYS/KERNEL.S
ASM