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A2osX/SYS/KERNEL.S.ENV.txt
Rémy GIBERT 7ced649025 Kernel 0.93+
2019-12-02 17:47:53 +01:00

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NEW
AUTO 3,1
*/--------------------------------------
* # ExpandStr
* **In:**
* Y,A = PTR to String to Expand (C-String)
* ## RETURN VALUE
* X = hMem to Expanded String (C-String)
* Y,A = PTR to Expanded String
*\--------------------------------------
.DUMMY
.OR ZPDRV
ENV.SearchPath .BS 2
ENV.BufLen .BS 1
ENV.VarEndChar .BS 1
ENV.bNoExp .BS 1
ENV.hMem .BS 1
ENV.bExp .BS 1
.ED
*--------------------------------------
K.ExpandStr stz ENV.hMem Reset Intermediate string...
.1 >STYA ZPPtr1
stz ENV.BufLen init Expanded String len=0
stz ENV.bExp No var found yet
stz ENV.bNoExp Reset no expand flag
.10 jsr SHARED.GetCharPtr1 End of CSTR?
beq .80
.11 cmp #'''
bne .21
lda ENV.bNoExp
eor #$ff
sta ENV.bNoExp toggle flag
bra .10
.21 bit ENV.bNoExp
bpl .23
.22 jsr ENV.AddAToBuf
bra .10
.23 cmp #'$' no, found one ?
bne .22 no, store...
ror ENV.bExp Toggle Expanded flag
lda (ZPPtr1)
bne .30
lda #'$' End of string, output $
bra .22
.30 stz ENV.VarEndChar
cmp #'{' "${VAR]"?
bne .31
dec ENV.VarEndChar "}" expected
jsr SHARED.NextCharPtr1 skip "{"
bra .40
.31 jsr ZP.IsDigit $0 ... $9 ?
bcs .32
and #$0f
jsr K.ArgV
bcs .35 Arg# is undefined, do not append anything
jsr ENV.AddYAToBuf
bra .35
.32 ldx #ENV.SysVars.Cnt-1
.33 cmp ENV.SysVars,x
beq .34
dex
bpl .33
bra .40
.34 jsr ENV.SysVar
.35 jsr SHARED.NextCharPtr1 skip $x
bra .10
.40 jsr ENV.ExpandStrVar
bcc .70
.50 jsr ENV.FindVarP1
bcs .70
jsr ENV.NextEnvP3
jsr ENV.AddP3ToBuf
.70 ldy #$ff
.71 iny
lda (ZPPtr1),y
beq .72
jsr SHARED.IsIDValid
bcc .71
.72 jsr SHARED.AddYToPtr1
lda ENV.VarEndChar
beq .10
bra .35 skip "}" and loop
.80 lda ENV.hMem working from our temp string ?
beq .81 no...
jsr K.FreeMem yes, discard....
.81 ldx ENV.BufLen
stz K.Buf256,x
>LDYAI K.Buf256
jsr K.strdup
bcs K.FileSearch.RTS
stx ENV.hMem save this as temp string, in case of recurse
bit ENV.bExp Did we expand something ?
bpl K.FileSearch.RTS No, exit with Y,A from STRDUP
jmp .1 Yes, start over with ENV.hMem
*/--------------------------------------
* # FileSearch
* Search a file in the provided PATH list
* And return, if found, the full path to it.
* ## C
* `int filesearch ( char * filename, char * searchpath, char * fullpath, stat * filestat);`
* ## ASM
* **In:**
* `>PUSHWI filestat`
* `>PUSHWI fullpath`
* `>PUSHWI searchpath`
* `>LDYAI filename`
* ## RETURN VALUE
* CC : success
* DstBuf = FilePath
* DstStat = S.STAT
* CS : not found
*\--------------------------------------
K.FileSearch pha
>PULLW ENV.SearchPath
>PULLW .2+1 DstBuf
>PULLW .4+1 DstStat
pla Y,A = filename
jsr ENV.Search.YA
bcs K.FileSearch.RTS
ldx #$ff
.1 inx
lda K.Buf256,x
.2 sta $ffff,x Self Modified
bne .1
ldx #S.STAT-1
.3 lda K.S.STAT,x
.4 sta $ffff,x Self Modified
dex
bpl .3
* clc
K.FileSearch.RTS
rts
*--------------------------------------
ENV.Search.LIB ldx #0
.HS 2C BIT ABS
ENV.Search.DRV ldx #2
.HS 2C BIT ABS
ENV.Search.PATH ldx #4
>STYA ZPPtr2
>LDYA ENV.VARS,x
jsr K.GetEnv get value for Search Path
bcs K.FileSearch.RTS
>STYA ENV.SearchPath
>LDYA ZPPtr2
ENV.Search.YA >STYA .4+1
>LDYA ENV.SearchPath
jsr K.ExpandStr Y,A = Search Path, Expand it
bcs .99
stx .98+1
>STYA .2+1 expanded search list ;
stz .1+1
.1 ldy #$0 Self Modified Index in Search list string
ldx #$0
.2 lda $ffff,y Self Modified, Search list string
beq .3 end of string, try it....
iny
cmp #':'
beq .3
sta K.Buf256,x
inx
bra .2
.3 txa
beq .98 String is empty....nothing to try
sty .1+1 save current index
ldy #$0
.4 lda $ffff,y Self Modified, Append Filename...
sta K.Buf256,x
beq .5
iny
inx
bra .4
.5 >PUSHWI K.S.STAT
>LDYAI K.Buf256
>SYSCALL2 stat
bcs .1 Failed...retry next path...
lda K.S.STAT+S.STAT.P.TYPE
cmp #S.FI.T.DIR Dir ?
beq .1
jsr .98 Discard Expanded hSrch list
clc
.99 rts
.98 lda #$ff SELF MODIFIED : Discard Expanded hSrch list
jsr K.FreeMem
lda #MLI.E.FNOTFND
sec
rts
*/--------------------------------------
* # PutEnv
* Change or add an environment variable, string is 'NAME=VALUE'
* ## C
* `int putenv(char *string);`
* ## ASM
* **In:**
* `>LDYA string`
* `>SYSCALL putenv`
* ## RETURN VALUE
*\--------------------------------------
K.PutEnv >STYA ZPPtr2 NAME=VALUE
ldy #0
.1 lda (ZPPtr2),y copy NAME to K.Buf256
beq .9
cmp #'='
beq .2
sta K.Buf256,y
iny
bne .1
.9 lda #E.SYN
sec
rts
.2 lda #0
sta K.Buf256,y
jsr SHARED.AddYp1ToPtr2
>LDYAI K.Buf256
>STYA ZPPtr1
bra K.SetEnv.I
*/--------------------------------------
* # SetEnv
* Change or add an environment variable
* ## C
* `int setenv(const char *name, const char *value);`
* ## ASM
* **In:**
* `>PUSHW value`
* `>LDYA name`
* `>SYSCALL setenv`
* ## RETURN VALUE
*\--------------------------------------
K.SetEnv jsr SHARED.SPtr1PPtr2
K.SetEnv.I jsr K.UnsetEnv.I
.1 jsr ENV.InitEnvP3 ZPPtr3 -> Env
lda #1
sta ZPPtr4
stz ZPPtr4+1 ZPPtr4 = ENVSIZE = 1
.10 lda (ZPPtr3) End of ENV
beq .15
jsr ENV.GetP3LenY
jsr ENV.NextEnvP3Y
jsr ENV.NextEnvP4Y
bra .10
.15 ldy #$ff
.16 iny
lda (ZPPtr1),y
bne .16
jsr ENV.NextEnvP4Y ZPPtr4 = ENVSIZE + VAR
ldy #$ff
.19 iny
lda (ZPPtr2),y
bne .19
jsr ENV.NextEnvP4Y ZPPtr4 = ENVSIZE + VALUE
lda ZPPtr4
beq .20
inc ZPPtr4+1
.20 ldy #S.PS.ENVPAGECNT
lda (pPs),y
cmp ZPPtr4+1
bcs .22 env is large enough
lda ZPPtr4+1
jsr ENV.Dup.A
bcs .9
pha
ldy #S.PS.hENV
lda (pPs),y
jsr K.Freemem
pla
ldy #S.PS.hENV
sta (pPs),y
txa
dey S.PS.ENVPAGECNT
sta (pPs),y
bra .1 Start over
.22 ldy #$ff
.23 iny
lda (ZPPtr1),y
sta (ZPPtr3),y
bne .23
jsr ENV.NextEnvP3Y
ldy #$ff
.24 iny
lda (ZPPtr2),y
sta (ZPPtr3),y
bne .24
iny
sta (ZPPtr3),y don't forget array ending 0
clc
.9 rts
*/--------------------------------------
* # GetEnv
* searches the environment list to find the environment variable name,
* and returns a pointer to the corresponding value string.
* ## C
* `char *getenv(const char *name);`
* ## ASM
* **In:**
* `>LDYA name`
* `>SYSCALL getenv`
* ## RETURN VALUE
* CC : Y,A = PTR to VALUE (C-String)
* CS : not found
*\--------------------------------------
K.GetEnv >STYA ZPPtr1
jsr ENV.FindVarP1
bcs .9
jsr ENV.NextEnvP3 Skip NAME
clc just in case ADC in NextEnvPtr3 disturb CC
.9 >LDYA ZPPtr3 \0
rts
*/--------------------------------------
* # UnsetEnv
* Remove an environment variable
* ## C
* `int unsetenv(const char *name);`
* ## ASM
* **In:**
* `>LDYA name`
* `>SYSCALL unsetenv`
* ## RETURN VALUE
*\--------------------------------------
K.UnsetEnv >STYA ZPPtr1 Store VAR Name
K.UnsetEnv.I jsr ENV.FindVarP1
bcs K.UnsetEnv.I.8 not found, quit
jsr ENV.DelVarP3 Ptr3 -> ENVNAME
K.UnsetEnv.I.8 clc
K.UnsetEnv.I.9 rts
*--------------------------------------
* PRIVATE
*--------------------------------------
ENV.SysVarsAllArgs
lda #1
jsr K.ArgV
bcs ENV.SysVarsNum.8
>STYA ZPPtr3
.1 lda (ZPPtr3)
beq ENV.SysVarsNum.8
.2 jsr ENV.AddP3ToBuf
jsr ENV.NextEnvP3
lda (ZPPtr3)
beq ENV.SysVarsNum.8
lda #' '
jsr ENV.AddAToBuf
bra .2
*--------------------------------------
ENV.SysVar txa
beq ENV.SysVarsAllArgs
ldy ENV.SysVars.PS-1,x
lda (pPS),y
*--------------------------------------
ENV.SysVarsNum jsr MATH.A2STR10NP
ldy #0
.1 lda A2osX.NumStrBuf,y
beq ENV.SysVarsNum.8
iny
jsr ENV.AddAToBuf
bra .1
ENV.SysVarsNum.8
clc
rts
*--------------------------------------
ENV.SysVars .AS "*#?@$!"
ENV.SysVars.Cnt .EQ *-ENV.SysVars
ENV.SysVars.PS .DA #S.PS.ARGC,#S.PS.RC,#S.PS.PPID,#S.PS.PID,#S.PS.CPID
*--------------------------------------
ENV.ExpandStrVar
>LDYAI ENV.StrVars
>STYA ZPPtr3
ldx #0
.1 lda (ZPPtr3)
beq .9
ldy #$ff
.2 iny
lda (ZPPtr1),y
beq .3
jsr SHARED.IsIDValid
bcs .3
cmp (ZPPtr3),y
beq .2
bra .4
.3 lda (ZPPtr3),y
bne .4
jmp (ENV.StrVarsJmp,x)
.4 inx
inx
jsr ENV.NextEnvP3
bra .1
.9 sec
rts
*--------------------------------------
ENV.StrVars .AZ "LOGNAME"
.AZ "GECOS"
.AZ "HOME"
.AZ "SHELL"
.AZ "PWD"
.AZ "UID"
.AZ "GID"
.DA #0
*--------------------------------------
ENV.StrVarsJmp .DA ENV.StrVarsSession
.DA ENV.StrVarsSession
.DA ENV.StrVarsSession
.DA ENV.StrVarsSession
.DA ENV.StrVarsPWD
.DA ENV.StrVarsUID
.DA ENV.StrVarsGID
*--------------------------------------
ENV.StrVarsPWD ldy #S.PS.hCWD
lda (pPS),y
jsr K.GetMemPtr
jmp ENV.AddYAToBuf
*--------------------------------------
ENV.StrVarsUID ldy #S.SESSION.UID
.HS 2C
ENV.StrVarsGID ldy #S.SESSION.GID
lda (pSession),y
jmp ENV.SysVarsNum
ENV.StrVarsSession
lda pSession
clc
adc #S.SESSION.NAME
sta ZPPtr3
lda pSession+1
adc /S.SESSION.NAME
sta ZPPtr3+1
.1 dex
dex
bmi .3
ldy #$ff
.2 iny
lda (ZPPtr3),y
bne .2
jsr ENV.NextEnvP3Y
bra .1
.3 jmp ENV.AddP3ToBuf
*--------------------------------------
* ENV.FindVarP1
* In:
* ZPPtr1 -> NAME
* Out:
* CC: Found
* Y = NAME len
* ZPPtr1 -> NAME
* ZPPtr3 -> ENV.NAME
* CS: Not Found
* ZPPtr1 -> NAME
* ZPPtr3 -> PTR to Ending 0
*--------------------------------------
ENV.FindVarP1 jsr ENV.InitEnvP3 Store ENV
.1 lda (ZPPtr3)
beq .9 end of ENV
ldy #$ff
.2 iny
lda (ZPPtr1),y
beq .3
jsr SHARED.IsIDValid
bcs .3
cmp (ZPPtr3),y
beq .2
bra .4
.3 lda (ZPPtr3),y
bne .4
clc
rts
.4 jsr ENV.NextEnvP3x2 Skip NAME & VALUE
bra .1
.9 sec
rts
*--------------------------------------
* ENV.DelVarP3
* In:
* ZPPtr3 -> ENV.NAME to Discard
*--------------------------------------
ENV.DelVarP3 >LDYA ZPPtr3 save actual Ptr
>STYA ZPPtr4
jsr ENV.NextEnvP3x2 Skip NAME & VALUE
.1 ldy #$ff
.2 iny
lda (ZPPtr3),y Move back CSTRs...
sta (ZPPtr4),y
bne .2
tya
beq ENV.InitEnvP3.RTS we moved back ending \0
jsr ENV.NextEnvP3Y
jsr ENV.NextEnvP4Y
bra .1
*--------------------------------------
ENV.InitEnvP3 ldy #S.PS.hENV
lda (pPs),y
jsr K.GetMemPtr
>STYA ZPPtr3 Store ENV
ENV.InitEnvP3.RTS
rts
*--------------------------------------
ENV.NextEnvP3x2 jsr ENV.NextEnvP3
*--------------------------------------
ENV.NextEnvP3 jsr ENV.GetP3LenY
*--------------------------------------
ENV.NextEnvP3Y tya
ENV.NextEnvP3A sec
adc ZPPtr3
sta ZPPtr3
bcc .8
inc ZPPtr3+1
.8 rts
*--------------------------------------
ENV.GetP3LenY ldy #$ff
.1 iny
lda (ZPPtr3),y
bne .1
rts
*--------------------------------------
ENV.NextEnvP4Y tya
sec
adc ZPPtr4
sta ZPPtr4
bcc .8
inc ZPPtr4+1
.8 rts
*--------------------------------------
ENV.AddYAToBuf >STYA ZPPtr3
*--------------------------------------
ENV.AddP3ToBuf ldx ENV.BufLen
ldy #$ff
dex
.1 iny
inx
lda (ZPPtr3),y
sta K.Buf256,x
bne .1
stx ENV.BufLen
rts
*--------------------------------------
ENV.AddAToBuf ldx ENV.BufLen
sta K.Buf256,x
inc ENV.BufLen
rts
*--------------------------------------
* ENV.Dup
* In:
* A = ENV hMem To Duplicate
* Out:
* A = hMem to new ENV
* X = Page Count
*--------------------------------------
ENV.Dup ldy #S.PS.ENVPAGECNT
lda (pPs),y
ENV.Dup.A sta .8+1 Store target page Count
ldy #0
jsr K.GetMem
bcs .9
>STYA .2+1 Target Buffer
phx save hMem
jsr Mem.SetOwner Set Ownership
ldy #S.PS.hENV
lda (pPs),y
jsr K.GetMemPtr
>STYA .1+1
ldy #S.PS.ENVPAGECNT get SOURCE page count
lda (pPs),y
tax
ldy #0
.1 lda $ffff,y SELF MODIFIED
.2 sta $ffff,y SELF MODIFIED
iny
bne .1
inc .1+2
inc .2+2
dex
bne .1
.8 ldx #$ff SELF MODIFIED Target Page Count
pla hMem
clc
.9 rts
*--------------------------------------
ENV.VARS .DA .1
.DA .2
.DA .3
.1 .AZ "LIB"
.2 .AZ "DRV"
.3 .AZ "PATH"
*--------------------------------------
MAN
SAVE USR/SRC/SYS/KERNEL.S.ENV
LOAD USR/SRC/SYS/KERNEL.S
ASM
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