PR#3
PREFIX /A2OSX.BUILD
NEW
INC 1
AUTO 6
				.LIST OFF	
*--------------------------------------

*--------------------------------------
CSH.TYPE.CHAR	.EQ 1
CSH.TYPE.INT	.EQ 2
CSH.TYPE.LONG	.EQ 3
CSH.TYPE.FLOAT	.EQ 4
*--------------------------------------
CSH.Init		>PUSHWI 0				Aux type
				>PUSHBI 4				S.FILEINFO.TYPE.TXT
				>PUSHBI	SYS.FOpen.R
				
				lda #1
				>SYSCALL GetArg.A
				>PUSHYA
				>SYSCALL LoadFile
				bcs .9
				>SETG.YA CSH.BufLen
				
				txa
				>SETG.A CSH.hBuf
				
				lda #$FF
				>SETG.A bExitOnEOF

				>LDYAI 256
				>SYSCALL GetMem0.YA
				bcs .9
				txa
				ldy #CSH.hSymbols
				sta (pData),y
				
				lda #0
				ldy #CSH.SymbolsPtr
				sta (pData),y
				
				>LDYAI 256
				>SYSCALL GetMem.YA
				bcs .9
				txa
				ldy #CSH.hData
				sta (pData),y
				
				lda #0
				ldy #CSH.DataPtr
				sta (pData),y
				
				>LDYAI 256
				>SYSCALL GetMem.YA
				bcs .9
				txa
				ldy #CSH.hStack
				sta (pData),y
				
				lda #0
				ldy #CSH.StackPtr
				sta (pData),y
				
*				clc
.9				rts
*--------------------------------------
CSH.Run			jsr CSH.GetBuf

				jsr CSH.GetPtrs
				
				lda #0
				>SETG.A CmdBuflen		Reset Cmdline
				
				jsr CSH.GetCharNB
				bcs .9
				
				cmp #'}'				End of block ?
				bne .1

				jsr CSH.CheckStack		must be on stack....
				bcs .9
				
				jsr CSH.Pop				was expected, get stacked Cmd...
				tax
				jmp (J.CSHCMDS.END,x) 
				
.1				cmp #$0D
				bne .2
				
				jmp CSH.GetNextCharNB	Skip CR
				
.2				pha
				jsr CSH.SavePtr			Save Ptr, in case of while,for....
				pla
				jsr CSH.IsLetter
				bcc .3
				
				cmp #'#'
				beq .5					comments : pass line to shell
				
				bra .9					error, todo : PREOPS ++ --.....
				
.3				jsr CSH.GetName	
				bcs .9
						
				jsr CSH.IsKeyword
				bcs .4					not an internal CSH keyword....
				
				stx CSH.CmdSave
				jmp (J.CSHCMDS,x)		

.4				jsr CSH.GetVar
				bcs .5
				jsr CSH.GetCharNB
				bcs .9
				cmp #'='
				bne .99
				
				jsr CSH.GetNextCharNB	Skip =
				bcs .99
				
				jsr CSH.ExpEval
				bcs .9
				
				jsr CSH.GetChar
				bcs .9
				cmp #';'
				bne .99
				
				jsr CSH.SetVar
				bcs .9
				
				jmp CSH.GetNextCharNB	Skip ;
				
.99				lda #CSH.E.SYNTAX
				sec
.9				rts

.5				


				jsr CSH.RestorePtr		Restore ptr to get full cmd line to execute
				
				>GETG.A hCmdBuf			Get the buffer
				>SYSCALL GetMemPtr.A
				>STYA ZPCMDBuf
				
				jsr CSH.GetCharNB
				
				ldy #0
				
.6				cmp #13
				beq .7
				sta (ZPCMDBuf),y
				iny
				cpy #CmdLine.MAX
				beq .8
				
				jsr CSH.GetNextChar
				bcc .6
				bra .8
				
.7				jsr CSH.GetNextCharNB	Skip CR
				
.8				lda #0
				sta (ZPCMDBuf),y
				tya
				>SETG.A CmdBuflen
				lda #$ff
				>SETG.A bCmdBufexec
				
				ldy #bEcho
				lda (pData),y
				beq .80

				>PUSHW ZPCMDBuf
				>LDYA L.MSG.ECHO
				>SYSCALL PrintF.YA
				
.80				clc
				rts
*--------------------------------------
CSH.Quit		ldy #CSH.hBuf
				lda (pData),y
				beq .1
				>SYSCALL FreeMem.A

.1				ldy #CSH.hStack
				lda (pData),y
				beq .2
				>SYSCALL FreeMem.A
				
.2				ldy #CSH.hData
				lda (pData),y
				beq .3
				>SYSCALL FreeMem.A
				
.3				ldy #CSH.hSymbols
				lda (pData),y
				beq .8
				>SYSCALL FreeMem.A
				
.8				rts
*--------------------------------------
CSH.GetBuf		ldy #CSH.hBuf
				lda (pData),y
				>SYSCALL GetMemPtr.A
				>STYA ZPCSHBufBase
				
				ldy #CSH.BufLen
				lda (pData),y
				clc
				adc ZPCSHBufBase
				sta CSH.GetChar.LO+1

				iny
				lda (pData),y
				adc ZPCSHBufBase+1
				sta CSH.GetChar.HI+1
				
CSH.SetBufPtr	ldy #CSH.BufPtr
				lda (pData),y
				clc
				adc ZPCSHBufBase
				sta ZPCSHBufPtr
				
				iny
				lda (pData),y
				adc ZPCSHBufBase+1
				sta ZPCSHBufPtr+1
				rts
*--------------------------------------
CSH.GetPtrs		ldy #CSH.hSymbols
				lda (pData),y
				>SYSCALL GetMemPtr.A
				>STYA ZPCSHSymbols

				ldy #CSH.hData
				lda (pData),y
				>SYSCALL GetMemPtr.A
				>STYA ZPCSHData
				
				ldy #CSH.hStack
				lda (pData),y
				>SYSCALL GetMemPtr.A
				>STYA ZPCSHStack
				rts
*--------------------------------------
CSH.SavePtr		phy
				ldy #CSH.BufPtr
				lda (pData),y
				sta CSH.BufPtrSave
				
				iny
				lda (pData),y
				sta CSH.BufPtrSave+1
				ply
				rts
*--------------------------------------
CSH.RestorePtr	phy
				ldy #CSH.BufPtr
				lda CSH.BufPtrSave
				sta (pData),y
				clc
				adc ZPCSHBufBase
				sta ZPCSHBufPtr
				
				iny
				lda CSH.BufPtrSave+1
				sta (pData),y
				adc ZPCSHBufBase+1
				sta ZPCSHBufPtr+1
				ply
				rts
*--------------------------------------
CSH.IsKeyword	phy
				>LDYA L.CSHCMDS
				>STYA ZPPtr2
				
				ldx #0
				
.1				lda (ZPPtr2)
				beq .9					Ending 0, not found....
				
				cmp CSH.Name			Same Len ?
				bne .4
				
				tay
				
.2				lda CSH.Name,y

				cmp #'a'				To Uppercase
				bcc .3
				cmp #'z'+1
				bcs .3
				eor #$20

.3				cmp (ZPPtr2),y
				bne .4
				dey
				bne .2
				
				ply
				clc					Found an internal Cmd...
				rts

.4				inx
				inx
				
				lda ZPPtr2
				sec
				adc (ZPPtr2)
				sta ZPPtr2
				bcc .1
				inc ZPPtr2+1
				bra .1
				
.9				ply
				sec
				rts
*--------------------------------------
CSH.WHILE
CSH.IF			jsr CSH.GetCharNB
				bcs .9
				cmp #'('
				bne .9
				
				jsr CSH.GetNextCharNB
				bcs .9
				
				jsr CSH.ExpEval
				bcs .99
				
				jsr CSH.GetCharNB
				bcs .99
				cmp #')'
				bne .9
				
				jsr CSH.GetNextCharNB
				bcs .99
				cmp #'{'
				bne .9
				
				lda CSH.ACC
				ora CSH.ACC+1
				ora CSH.ACC+2
				ora CSH.ACC+3
				beq .6					eval returned false, skip {{....}}
				
				jsr CSH.GetNextCharNB	Skip '{'

				lda CSH.CmdSave			Push "IF" or "WHILE"
				beq .1					if "IF", no need to push Saved Ptr
				
				pha
				lda CSH.BufPtrSave+1	WHILE : push loop address...
				jsr CSH.Push
				lda CSH.BufPtrSave
				jsr CSH.Push		
				pla
				
.1				jsr CSH.Push
				bcs .99
				
				lda #'}'				Tell '}' is expected at the end of block
				jsr CSH.Push
				bcs .99
	
				rts
				
.6				ldx #1					expecting 1 '}' for now....

.7				jsr CSH.GetNextChar
				bcs .9
				cmp #'{'
				bne .71
				inx
				bra .7
				
.71				cmp #'}'
				bne .7
				txa
				beq .9
				dex
				bne .7
				
				jsr CSH.GetNextChar
				
				clc
				rts
				
.9				lda #CSH.E.SYNTAX
				sec
.99				rts
*--------------------------------------
CSH.IF.END		jsr CSH.GetNextChar		just skip ending '}'
				clc
				rts
*--------------------------------------
CSH.WHILE.END	jsr CSH.Pop
				ldy #CSH.BufPtr
				sta (pData),y
				jsr CSH.Pop
				ldy #CSH.BufPtr+1
				sta (pData),y
				clc
				rts
*--------------------------------------
CSH.BREAK
*--------------------------------------
CSH.CONTINUE

				lda #CSH.E.SYNTAX
				sec
				rts
*--------------------------------------
CSH.CHAR		lda #CSH.TYPE.CHAR
				bra CSH.TYPE
CSH.INT			lda #CSH.TYPE.INT
				bra CSH.TYPE
CSH.LONG		lda #CSH.TYPE.LONG
				bra CSH.TYPE
CSH.FLOAT		lda #CSH.TYPE.FLOAT

CSH.TYPE		sta CSH.ACCT
				
				jsr CSH.GetChar
				bcs .9
				cmp #' '
				bne .9
				
				jsr CSH.GetNextCharNB
				bcs .9

				jsr CSH.IsLetter
				bcs .9

				jsr CSH.GetName
				bcs .9
				
				jsr CSH.GetCharNB
				bcs .9
				cmp #';'
				beq .8					end of declaration, no value...
				
				cmp #'='
				bne .9
				
				jsr CSH.GetNextCharNB
				bcs .9
				
				jsr CSH.ExpEval
				bcs .9
				
				jsr CSH.GetChar
				bcs .9
				cmp #';'
				bne .9
				
.8				jsr CSH.AddVar
				bcs .99
				
				jsr CSH.GetNextCharNB	Skip ;
				clc
				rts
				
.9				lda #CSH.E.SYNTAX
				sec
.99				rts
*--------------------------------------

				lda #CSH.E.SYNTAX
				sec
				rts
*--------------------------------------
CSH.ExpEval		jsr CSH.ZeroACC
				
				ldy #0
				
				jsr CSH.GetCharNB
				bcs .9
				cmp #')'
				beq .8
				cmp #';'
				beq .8
				
				jsr CSH.IsLetter		Fnc or Var ?
				bcs .1

				bra .9
				
.1				jsr CSH.IsDigit10		number ?
				bcs .9
				
				jsr CSH.GetNumInACC
				bcs .9
		
				
.8				clc
				rts
				
.9				lda #CSH.E.SYNTAX
				sec
.99				rts	
*--------------------------------------
CSH.GetName		ldy #0
								
.1				iny
				sta CSH.Name,y
				jsr CSH.GetNextChar
				bcs .8
				
				jsr CSH.IsLetterOrDigit
				bcs .8
				cpy #CSH.Name.MAX
				bcc .1
				
				lda #CSH.E.TOOLONG
				sec
				rts
				
.8				sty CSH.Name
				clc
				rts
				
.9				lda #CSH.E.SYNTAX
				sec
				rts					
*--------------------------------------
CSH.GetNumInACC	ldy #0

.1				iny
				cpy #10
				beq .9
				
				sta ARGS,y
				jsr CSH.GetNextChar
				bcs .8
				jsr CSH.IsDigit10
				bcc .1
				
.8				sty ARGS
				
				>PUSHW L.CSH.ACC
				>PUSHW L.ARGS
				>SYSCALL AToL
				bcs .9
				rts
				
.9				lda #CSH.E.SYNTAX
				sec
				rts	
*--------------------------------------
CSH.ZeroACC		stz CSH.ACC
				stz CSH.ACC+1
				stz CSH.ACC+2
				stz CSH.ACC+3
				rts
*--------------------------------------
* Vars...
*--------------------------------------
CSH.AddVar		jsr CSH.FindVar
				bcc .97

				ldy #CSH.SymbolsPtr
				lda (pData),y
				
				sec
				adc CSH.Name
				bcs .99
				
				adc #2					TYPE + OFS
				bcs .99
				
				ldy #CSH.DataPtr
				lda (pData),y
				pha
				
				ldx CSH.ACCT
*				clc
				adc CSH.TSIZE,x
				bcs .98

				ldx #$ff

				ldy #CSH.SymbolsPtr
				lda (pData),y
				tay
				
.10				inx
				lda CSH.Name,x
				sta (ZPCSHSymbols),y
				iny
				cpx CSH.Name
				bne .10
				
				lda CSH.ACCT
				sta (ZPCSHSymbols),y
				
				iny
				pla						Get Back Data OFS				
				pha
				sta (ZPCSHSymbols),y
				iny
				
				tya
				ldy #CSH.SymbolsPtr
				sta (pData),y
				
				ply						Get Back Data OFS again
				
				ldx CSH.ACCT
				lda CSH.TSIZE,x
				
				ldx #0
				
.1				pha
				lda CSH.ACC,x
				sta (ZPCSHData),y
				iny
				inx
				pla
				dec
				bne .1
				
				tya
				ldy #CSH.DataPtr
				sta (pData),y
				
				clc
				rts
				
.97				lda #CSH.E.DUP
				sec
				rts
			
.98				pla
.99				lda #CSH.E.OOM
				sec
				rts
*--------------------------------------
CSH.SetVar

				clc
				rts
*--------------------------------------
CSH.GetVar		jsr CSH.FindVar
				bcs .9
				
				clc
.9				rts
*--------------------------------------
CSH.FindVar		>LDYA ZPCSHSymbols
				>STYA ZPPTR1
				
.1				ldy #0

				lda (ZPPTR1),y
				beq .9
				
				cmp CSH.Name
				bne .4
				
				pha						Save Name len...
				
				ldx #0
				
.2				iny
				inx
				lda (ZPPTR1),y
				cmp CSH.Name,x
				bne .3
				
				cpx CSH.Name
				bne .2
				
				pla
				sec
				adc ZPPTR1
				sta ZPPTR1
				bcc .8
				inc ZPPTR1+1
				
				clc
.8				rts
							
.3				pla
.4				sec
				adc ZPPTR1
				bcc .5
				inc ZPPTR1+1
				clc
				
.5				adc #2					Skip Type+OFS
				sta ZPPTR1
				bcc .1
				inc ZPPTR1+1
				bra .1
				
.9				sec
				rts
*--------------------------------------
* Stack
*--------------------------------------
CSH.Push		pha
				ldy #CSH.StackPtr
				lda (pData),y
				tay
				
				pla
				sta (ZPCSHStack),y
				iny
				beq .9
				tya
				ldy #CSH.StackPtr
				sta (pData),y
				clc
				rts
	
.9				lda #CSH.E.SOVERFLW
				sec
				rts
*--------------------------------------
CSH.Pop			ldy #CSH.StackPtr
				lda (pData),y
				beq .9
				dec
				tay
				sta (pData),y
				lda (ZPCSHStack),y
				clc
				rts

.9				lda #CSH.E.SYNTAX
				sec
				rts				
*--------------------------------------
CSH.CheckStack	pha
				ldy #CSH.StackPtr
				lda (pData),y
				beq .9
				dec
				tay
				pla
				cmp (ZPCSHStack),y
				bne .9
				
				tya
				ldy #CSH.StackPtr
				sta (pData),y
				
				clc
				rts
				
.9				lda #CSH.E.SYNTAX
				sec
				rts						
*--------------------------------------
* CHAR related Subs.....
*--------------------------------------
CSH.GetCharNB	jsr CSH.GetChar
				bcs CSH.GetNextCharNB.RTS
				jsr CSH.CheckCharNB
				bcc CSH.GetNextCharNB.RTS		
*--------------------------------------
CSH.GetNextCharNB
				jsr CSH.GetNextChar
				bcs CSH.GetNextCharNB.RTS
				jsr CSH.CheckCharNB
				bcs CSH.GetNextCharNB
CSH.GetNextCharNB.RTS
				rts
*--------------------------------------
CSH.CheckCharNB	cmp #32					SPACE
				beq .9
				cmp #13					CR
				beq .9
				cmp #10					LF
				beq .9
				cmp #8					TAB
				beq .9
				clc
.9				rts				
*--------------------------------------
CSH.GetNextChar	phy
				ldy #CSH.BufPtr
				lda (pData),y
				inc
				sta (pData),y
				bne .1
				
				iny
				lda (pData),y
				inc
				sta (pData),y
				
.1				ply

				inc ZPCSHBufPtr
				bne CSH.GetChar
				inc ZPCSHBufPtr+1
*--------------------------------------
CSH.GetChar		lda ZPCSHBufPtr
CSH.GetChar.LO	eor #$ff				Self Modified
				bne CSH.GetChar.8
				
				lda ZPCSHBufPtr+1
CSH.GetChar.HI	eor #$ff				Self Modified
				bne CSH.GetChar.8
				
				lda #MLI.ERR.EOF
				sec
				rts
				
CSH.GetChar.8	lda (ZPCSHBufPtr)
				clc
				rts
*---------------------------------------
CSH.IsLetterOrDigit
				jsr CSH.IsDigit10
				bcc CSH.IsLetterRTS
*---------------------------------------
CSH.IsLetter	cmp #'_'
				bne .1
				clc
				rts
				
.1				cmp #'A'
				bcc .9
				
				cmp #'Z'+1
				bcc CSH.IsLetterRTS

				cmp #'a'
				bcc .9
				cmp #'z'+1
				rts						CC if lowercase

.9				sec
				
CSH.IsLetterRTS	rts					
*---------------------------------------
CSH.IsDigit10	cmp #'0'
				bcc .9
				cmp #'9'+1
				rts						cc if ok, cs if not
					
.9				sec
				rts
*--------------------------------------
MAN
SAVE /A2OSX.SRC/SBIN/SHELL.S.CSH
LOAD /A2OSX.SRC/SBIN/SHELL.S
ASM