A2osX/SYS/KERNEL.S.STDIO.txt

NEW
PREFIX /A2OSX.BUILD
AUTO 4,1
*--------------------------------------
*K.PrintF.PadL	.BS 1
*K.PrintF.PadC	.BS 1
*HEXBUF			.BS 4
*BCDBUF			.BS 5					5, enough to handle 10 digits (32bits)
*--------------------------------------
HEXBUF			.EQ FAC
K.PrintF.PadL	.EQ FAC+4
K.PrintF.PadC	.EQ FAC+5
BCDBUF			.EQ ARG
*/--------------------------------------
* # FPutC
* Print A (char) to hFILE
* ## C
* `int fputc ( hFILE stream , int character );`
* ## ASM
* **In:**
* A : character
* Y : stream
* **Out:** 
* CC = success
*\--------------------------------------
K.FPutC			sta K.IOBuf
				tya
				bra K.PutChar.1
*/--------------------------------------
* # PutChar
* ## C
* `int putchar ( int character );`
* ## ASM
* Print A (char) to StdOut
* **In:**
* A : char to print
* **Out:** 
* CC = success
*\--------------------------------------
K.PutChar		sta K.IOBuf

				ldy #S.PS.hStdOut
				lda	(pPs),y
				
K.PutChar.1		jsr K.GetMemPtr
				bcs K.PutS.9

				>STYA pFD
				
				ldx #1
				
K.PutChar.X		>LDYAI K.IOBuf
				>STYA K.S.IOCTL+S.IOCTL.BUFPTR
				stx K.S.IOCTL+S.IOCTL.BYTECNT
				stz K.S.IOCTL+S.IOCTL.BYTECNT+1
				jmp IO.Write.I
*/--------------------------------------
* # PutS
* Write Str to StdOut, appends '\r\n'
* ## C
* `int puts ( const char * str );`
* **In:**
* ## ASM
* `>LDYAI str`
* `>SYSCALL puts`
* **Out:** 
* CC = success
*\--------------------------------------
K.PutS			>STYA K.S.IOCTL+S.IOCTL.BUFPTR
				>STYA ZPPtr1
				
				ldy #S.PS.hStdOut
				lda	(pPs),y
				jsr K.FPutS.I
				bcs K.PutS.9

				lda #13
				sta K.IOBuf
				lda #10
				sta K.IOBuf+1
				ldx #2
				bra K.PutChar.X
K.PutS.9		rts
*/--------------------------------------
* # FPutS
* Write Str to FILE
* ## C
* `int fputs (hFILE stream, const char * str );`
* ## ASM
* **In:**
* `>PUSHW str`
* `lda stream`
* `>SYSCALL fputs`
* **Out:** 
* CC = success
*\--------------------------------------
K.FPutS			pha

				>PULLA
				sta K.S.IOCTL+S.IOCTL.BUFPTR
				sta ZPPtr1
				>PULLA
				sta K.S.IOCTL+S.IOCTL.BUFPTR+1
				sta ZPPtr1+1
				
				pla
				
K.FPutS.I		jsr K.GetMemPtr
				bcs K.PutS.9

				>STYA pFD
				
				ldy #0		
				ldx #0
				
.1				lda (ZPPtr1),y
				beq .2
				
				iny
				bne .1
				inx
				inc ZPPtr1+1
				bra .1
				
.2				sty K.S.IOCTL+S.IOCTL.BYTECNT
				stx K.S.IOCTL+S.IOCTL.BYTECNT+1
				jmp IO.Write.I
*/--------------------------------------
* # PrintF/SPrintF/FPrintF
* Prints C-Style String
* ## C
* `int printf ( const char * format, ... );`
* `int sprintf ( char * str, const char * format, ... );`
* `int fprintf ( hFILE stream, const char * format, ... );`
* ## ASM
* **In:**
* PrintF : (example is for printing Y,A as integer : format="Y,A= %I", 2 bytes)  
* `>PUSHYA`
* `...`
* `>PUSHBI bytecount`
* `>LDYAI format`
* `>SYSCALL printf`
* SPrintF : 
* `>PUSHYA`
* `...`
* `>PUSHBI bytecount`
* `>PUSHWI format`
* `>LDYAI str`
* `>SYSCALL sprintf`
* FPrintF : 
* `>PUSHYA`
* `...`
* `>PUSHBI bytecount`
* `>PUSHWI format`
* `lda hFILE`
* `>SYSCALL fprintf`
* **Out:**
* CC : success, Y,A = bytes sent
* CS : error, A = code from Output
* Specifiers :
* + %b : pull 1 byte to Print BIN 
* + %B : pull 2 bytes to Print BIN
* + %d : pull 1 byte unsigned DEC 0..255
* + %D : pull 2 bytes unsigned DEC 0..65535
* + %u : pull 4 bytes long unsigned DEC 0..4294967295
* + %e : pull 5 Bytes float (-)1.23456789e+12
* + %f : pull 5 Bytes float (-)3.1415
* + %h : pull 1 byte to Print HEX
* + %H : pull 2 bytes to Print HEX
* + %i : pull 1 byte to Print signed DEC -128..127
* + %I : pull 2 bytes to Print signed DEC -32768..32767
* + %L : pull 4 bytes signed DEC -2147483648..2147483647
* + %n : pull 1 byte to Print low Nibble HEX
* + %N : pull 1 byte to Print high Nibble HEX
* + %s : pull 2 bytes ptr to C-Style String
* + %S : pull 2 bytes ptr to P-Style String
* + \b : Print 'BS' (08)
* + \e : Print 'ESC' ($1B,27)
* + \f : Print 'FF' ($0C,12)
* + \n : Print 'LF' ($0A,10)
* + \r : Print 'CR' ($0D,13)
* + \\\\ : Print \
* + \\% : Print %
* Modifiers for len and padding : 
* + %d	  : '9'  '12'
* + %2d	  : ' 9' '12'   				
* + %02d  : '09' '12'
* + %11s  : 'ABCDEFGH   '	
* + %011s : 'ABCDEFGH000'
* + %2f	  :	'3.14'
*\--------------------------------------
K.SPrintF		>STYA pIOBuf			Out Buffer
				>PULLW ZPPtr1			format
				bra K.PrintF.1
				
K.FPrintF		jsr K.GetMemPtr			A = hFILE
				>STYA pFD

				>PULLW ZPPtr1			format
				bra K.PrintF.0

K.PrintF		>STYA ZPPtr1			format
				ldy #S.PS.hStdOut
				lda	(pPs),y
				
				jsr K.GetMemPtr
				>STYA pFD
	
K.PrintF.0		>LDYAI K.IOBuf
				>STYA pIOBuf
				>STYA K.S.IOCTL+S.IOCTL.BUFPTR
				
K.PrintF.1		stz K.S.IOCTL+S.IOCTL.BYTECNT
				stz K.S.IOCTL+S.IOCTL.BYTECNT+1

				stz PrintF.GetByte+1
				
				ldy	#0				

.1				lda (ZPPtr1),y
				beq .8					end of format..
				iny
				cmp #'%'
				bne .10
						
				stz K.PrintF.PadL
				lda #' '
				sta K.PrintF.PadC
				
.2				ldx	#PrintFTBL2-PrintFTBL1-1
				lda (ZPPtr1),y
				beq .99
				iny
				
.3				cmp PrintFTBL1,x		do we have a %x command?
				beq .6					yes, jmp to it!
				dex
				bpl	.3					no valid letter...
				
				cmp #'0'				...a 0...mmm... padding char?
				bne .4
				
				ldx K.PrintF.PadL		K.PrintF.PadL is not nul, so this 0 is second digit
				bne .5
				
*				lda #'0'
				sta K.PrintF.PadC		no, this is the first 0, so make it K.PrintF.PadC
				bra .2

.4				jsr MEM.IsDigit
				bcs .99		
				
.5				and #$0F				we have a digit
				pha						save it...
				lda K.PrintF.PadL				starts K.PrintF.PadL * 10
				asl 
				asl 					A=times 4
				adc K.PrintF.PadL				CC by ASL, A=times 5			
				asl						times 10
				sta K.PrintF.PadL

				pla						get back digit
				adc K.PrintF.PadL
				sta K.PrintF.PadL
				bra .2					go get next char...

.6				phy
				txa
				asl
				tax
				jsr PrintF.ESC
				ply
				bcc .1
				bcs .99
				
.8				jsr PrintF.Flush		
				bra .99

.10				cmp #'\'
				bne .20
				
				ldx	#PrintFTBL2.OUT-PrintFTBL2-1
				lda (ZPPtr1),y
				beq .99
				iny
				
.12				cmp PrintFTBL2,x
				beq .13
				dex
				bpl	.12
				bra .1
				
.13				lda	PrintFTBL2.OUT,x	

.20				jsr	PrintF.COut
				bcc	.1
				
.99				php
				pha
				lda pStack
				sec						ByteCnt byte
				adc (pStack)			... ByteCnt
				sta pStack				CC
				pla
				plp
				rts
*--------------------------------------
PrintF.ESC		jmp	(.1,x)
.1				.DA PrintF.B,PrintF.BB
				.DA PrintF.D,PrintF.DD,PrintF.U
				.DA PrintF.E,PrintF.F
				.DA PrintF.H,PrintF.HH
				.DA PrintF.I,PrintF.II,PrintF.L
				.DA PrintF.N,PrintF.NN
				.DA PrintF.S,PrintF.SS
*--------------------------------------
PrintFTBL1		.AS	"bBdDuefhHiILnNsS"
PrintFTBL2		.AS	"befnr\%"
PrintFTBL2.OUT	.HS 08.1B.0C.0A.0D		\b\e\f\n\r
				.DA #'\'				\\
				.DA #'%'				\%
*--------------------------------------
PrintF.BB		jsr PrintF.GetByte
				bcs PrintF.BB.RTS
				pha
				jsr PrintF.B
				pla
				bcc PrintF.B.1
PrintF.BB.RTS	rts
*--------------------------------------
PrintF.B		jsr PrintF.GetByte
				bcs PrintF.BB.RTS
				
PrintF.B.1		ldx #8
				
.1				asl
				pha
				lda #'0'
				adc #0					add Carry
				jsr PrintF.COut
				pla
				bcs PrintF.BB.RTS
				dex
				bne .1
				rts
*--------------------------------------
PrintF.I		sec						signed short
				.HS 90					BCC
PrintF.D		clc						unsigned short (BYTE)
				ldx #0					one byte
				
				jsr PrintF.GetByte
				bcs PrintF.BB.RTS
				sta HEXBUF
				
				stz HEXBUF+1
				bra PrintF.DD.1
				
PrintF.II		sec						signed int
				.HS 90					BCC
PrintF.DD		clc						unsigned int (WORD)
				ldx #1					two bytes
				
				jsr PrintF.GetByte
				bcs PrintF.BB.RTS
				sta HEXBUF

				jsr PrintF.GetByte
				bcs PrintF.BB.RTS
				sta HEXBUF+1

PrintF.DD.1		stz HEXBUF+2
				stz HEXBUF+3
				bra PrintF.U.1

PrintF.L		sec						signed long
				.HS 90					BCC
PrintF.U		clc						unsigned long (DWORD)

				ldx #$ff
				
.1				jsr PrintF.GetByte
				bcs PrintF.BB.RTS
				inx
				sta HEXBUF,x

				cpx #3
				bne .1
				
*				ldx #3					4 bytes
				
PrintF.U.1		bcc PrintF.Hex2Dec		unsigned, nothing to check
		
				lda HEXBUF,x			get sign
				bpl PrintF.Hex2Dec
				
*				sec

				ldy #0
				
.1				lda HEXBUF,y			two's complement of X bytes
				eor #$ff
				adc #0
				sta HEXBUF,y
				iny
				dex
				bpl .1
				
				sec						tell to print a "-" sign....
*--------------------------------------
* Convert HEXBUF to ASCBUF decimal padded with 0
*--------------------------------------
PrintF.Hex2Dec	ror	.31+1

				ldx #4

.1				stz BCDBUF,x	Clear all 5 bytes
				dex
				bpl .1
				
				sed				switch to BCD mode

				ldx #32			let's roll 32 bits
				
.2				asl HEXBUF
				rol HEXBUF+1
				rol HEXBUF+2
				rol HEXBUF+3

				ldy #4
				
.3				lda BCDBUF,y
				adc BCDBUF,y
				sta BCDBUF,y
				dey
				bpl .3
				
				dex
				bne .2
				
				cld

.31				bit #$ff				SELF MODIFIED -sign to print before digits ?
				bpl .9
				lda #'-'
				jsr PrintF.COut
				
.9				lda K.PrintF.PadL		any Len format ?
				beq .4					no
				
				lda #10
				sec						yes, Print only digits starting at pos 10-K.PrintF.PadL
				sbc K.PrintF.PadL
				
.4				tax						x=0 if no K.PrintF.PadL, or x=10-K.PrintF.PadL

.5				txa						X range 0 to 9
				lsr						CS if lo nibble (1,3,5,7,9)
				tay
				
				lda BCDBUF,y
				
				bcs .6
				
				lsr
				lsr
				lsr
				lsr
				
.6				and #$0F
				ora #$30
				cmp #$30

				beq .7				a zero?
				
				inc K.PrintF.PadL			found a non zero, Print all digits, even if 0, next time
				ldy #'0'
				sty K.PrintF.PadC
				bra .8
				
.7				cpx #9				last digit ?
				beq .8				Print always
				
				ldy K.PrintF.PadL			no pad to fill, do not Print 0
				beq .10
				
				lda K.PrintF.PadC			fill with K.PrintF.PadC
				
.8				jsr PrintF.COut
				bcs .99

.10				inx
				cpx #10
				bne .5
				
				clc
.99				rts
*--------------------------------------	
* EXP(8) 1(s) 1significants(31)
* http://apple2.org.za/gswv/a2zine/GS.WorldView/Resources/GS.TECH.INFO/AppleSoft/
*--------------------------------------		
PrintF.E		sec						Force "E+12"
				.HS 90					BCC
PrintF.F		clc

				lda PrintF.GetByte+1	get current stack Ptr
				tay
				clc						at least 5 bytes remaining ?
				adc #5

				cmp (pStack)
				bcc .1
				bne .9
				
.1				tya
				sec						+1
				adc pStack
				sta INDEX
				
				lda pStack+1
				sta INDEX+1
								
				ldx #ROM.SETFAC
				jsr GP.ROMCALL
				
				lda PrintF.GetByte+1
				clc
				adc #5
				sta PrintF.GetByte+1

				ldy #3					In order not to trash A2osX.SaveSM,A2osX.SaveSX
				ldx #ROM.FOUT
				jsr GP.ROMCALL
				
				ldy #0
				
.2				lda $102,y
				beq .8
				
				jsr PrintF.COut

				iny
				bne .2
				
.8				clc
				rts
				
.9				sec
				rts
*--------------------------------------
PrintF.HH		jsr PrintF.GetByte
				bcs PrintF.H.9
				pha
				jsr PrintF.H
				pla
				bra PrintF.H.1
*--------------------------------------
PrintF.H		jsr PrintF.GetByte
				bcs PrintF.H.9
PrintF.H.1		pha
				jsr PrintF.NN.1
				pla
				bra PrintF.N.1
PrintF.H.9		rts
*--------------------------------------
PrintF.N		jsr PrintF.GetByte
				bcs PrintF.H.9
PrintF.N.1		and #$0F
				bra PrintF.NN.2

PrintF.NN		jsr PrintF.GetByte
				bcs PrintF.H.9
PrintF.NN.1		lsr
				lsr
				lsr
				lsr
				
PrintF.NN.2		ora #$30
				cmp #$3A
				bcc .1
				adc #6
.1				jmp PrintF.COut
*--------------------------------------
PrintF.S		ldy #$ff				CSTR
				.HS 2C					bit abs
PrintF.SS		ldy #$00				PSTR

				jsr PrintF.GetByte
				bcs .9
				sta ZPPtr2
				
				jsr PrintF.GetByte
				bcs .9
				sta ZPPtr2+1
			
				lda (ZPPtr2)			if CSTR:last char=0, if PSTR:len=0
				beq .8
				
				sty .1+1
			
.1				lda #$ff				Self Modified
				bne .11					CSTR
				
				tya						PSTR
				cmp (ZPPtr2)			len check
				beq .2
				
.11				iny
				
				lda	(ZPPtr2),y
				beq .2
		
				jsr PrintF.COut
				bcs .9

				lda K.PrintF.PadL
				beq .1
				
				cpy	K.PrintF.PadL
				bne .1
				clc
				rts
				
.2				lda K.PrintF.PadL
				beq .8
				
.3				cpy K.PrintF.PadL
				beq .8
				
				lda K.PrintF.PadC				
				jsr PrintF.COut
				bcs .9
				iny
				bne .3
				
.8				clc
.9				rts
*--------------------------------------
PrintF.GetByte	lda #$FF				SELF MODIFIED LStack Ptr
				cmp (pStack)
				beq .9					CS
				phy
				tay
				iny
				lda (pStack),y
				sty PrintF.GetByte+1
				ply
*				clc
.9				rts
*--------------------------------------
PrintF.COut		phy
				
				ldy K.S.IOCTL+S.IOCTL.BYTECNT
				sta (pIOBuf),y
				inc K.S.IOCTL+S.IOCTL.BYTECNT
				bne .8
				
				lda pIOBuf+1
				eor /K.IOBuf
				bne .7

*				we are printing to IObuf, flush!

				lda K.S.IOCTL+S.IOCTL.BYTECNT+1
				pha
				lda #1					Flush $100 bytes
				sta K.S.IOCTL+S.IOCTL.BYTECNT+1
				

				pla
				inc
				sta K.S.IOCTL+S.IOCTL.BYTECNT+1

				
.7				inc pIOBuf+1
				inc K.S.IOCTL+S.IOCTL.BYTECNT+1
				
.8				ply
				clc
				rts
*--------------------------------------
PrintF.Flush	jmp IO.Write.I
*/--------------------------------------
* # FGetS
* read bytes from stream into the array
* pointed to by s, until n-1 bytes are read, or a <newline> is read and
* transferred to s, or an end-of-file condition is encountered. The
* string is then terminated with a null byte.
* ## C
* `char *fgets(hFILE stream, char * s, int n);`
* ## ASM
* **In:**
* `>PUSHW n`
* `>PUSHW s`
* `lda hFILE`
* `>SYSCALL fgets`
* **Out:** 
*  Y,A: s 
* CC = success
*\--------------------------------------
K.FGetS			pha						save hFILE

				>PULLW ZPPtr1			s

				>PULLA
				sec
				sbc #2
				eor #$ff
				sta	ZPPtr2				!n
				>PULLA
				sbc #0
				eor #$ff
				sta	ZPPtr2+1			!n
				
				pla
				jsr K.GetMemPtr
				bcs .99
				
				>STYA pFD

				jsr K.GetC.I
				bcs .9
				
.1				lda K.IOBuf
				cmp #C.CR
				beq .8
				
				sta (ZPPtr1)
				inc ZPPtr1
				bne .2
				inc ZPPtr1+1
				
.2				inc ZPPtr2
				bne .3
				inc ZPPtr2+1
				beq .8
				
.3				jsr IO.READ.I
				bcc .1
				
.8				clc
				
.9				pha
				lda #0
				sta (ZPPtr1)
				pla
.99				rts
*/--------------------------------------
* # GetChar
* Get char from StdIn
* **In:**
*  none.
* **Out:** 
*  CC = success
*   A = char
*\--------------------------------------
K.GetChar		ldy #S.PS.hStdIn
				lda	(pPs),y		
*/--------------------------------------
* # GetC
* Get char from Node
* ## C
* `int getc ( FILE * stream );`
* ## ASM
* **In:**
*  A = hNODE
* **Out:** 
*  CC = success
*   A = char
*\-----------a---------------------------
K.GetC			jsr K.GetMemPtr
				bcs K.GetC.9
				
				>STYA pFD
				
K.GetC.I		>LDYAI K.IOBuf
				>STYA K.S.IOCTL+S.IOCTL.BUFPTR
				lda #1
				sta K.S.IOCTL+S.IOCTL.BYTECNT
				stz K.S.IOCTL+S.IOCTL.BYTECNT+1
				jsr IO.READ.I
				bcs K.GetC.9
				lda K.IOBuf
K.GetC.9		rts				
*/--------------------------------------
* # SScanF
* Read formatted data from string
* ## C
* `int sscanf ( const char * s, const char * format, ... );`
* ## ASM
* **In:**
* `>PUSHW ptr`
* `...`
* `>PUSHBI bytecount`
* `>PUSHWI format`
* + %i : short int
* + %d : byte
* + %I : int
* + %D : word
* + %L : long int
* + %U : dword
* + %h : HEX byte
* + %H : HEX word
* + %s : string
* TODO : %10s
* `>LDYA s`
* `>SYSCALL sscanf`
* **Out:**
* A = Number of arguments filled.
*\--------------------------------------
K.SScanF		>STYA ZPPtr2			String to Scan
				>PULLW ZPPtr1			format
				
				stz .5+1				reset LStack Ptr
				stz .80+1				rest Arg processed

.1				lda (ZPPtr1)			End Of format?
				beq .8

				inc ZPPtr1
				bne .11
				inc ZPPtr1+1

.11				cmp #'%' 				Escape ?
				beq .2
				
				cmp #' '				Space ?
				beq .12
				
				cmp (ZPPtr2)			Same char in string?
				bne .9
				
				inc ZPPtr2
				bne .1
				inc ZPPtr2+1
				bra .1
				
.12				inc ZPPtr2				Space....
				bne .14
				inc ZPPtr2+1

.14				cmp (ZPPtr2)			another one ?
				beq .12
				bne .1
				
.2				lda (ZPPtr1)			Get specifier after %
				beq .9					unexpected End of format after "%" ?

				inc ZPPtr1
				bne .21
				inc ZPPtr1+1

.21				ldx #K.SScanFJMP-K.SScanFTBL-2
				
.3				cmp K.SScanFTBL,x
				beq .4
				dex
				dex
				bpl .3
				
.9				jsr .8
				lda #MLI.E.EOF
				sec
				rts
				
.4				jsr .5
				bcs .9					out of Ptr on stack
				
				bra .1
				
.8				lda pStack
				sec						ByteCnt byte
				adc (pStack)			... ByteCnt
				sta pStack				CC

.80				lda #$ff				SELF MODIFIED Arg porcessed
.99				rts
*--------------------------------------
.5				lda #$FF				SELF MODIFIED LStack Ptr
				cmp (pStack)
				beq .99					CS
				
				tay
				iny
				lda (pStack),y
				sta ZPPtr3
				
				iny
				lda (pStack),y
				sta ZPPtr3+1			get VAR Ptr
				sty .5+1

				inc .80+1				parsed one more arg!
				jmp (K.SScanFJMP,x)
*--------------------------------------
K.SScanFTBL		.DA #'i,#1,#'d,#1,#'I,#2,#'D,#2,#'l,#4,#'u,#4,#'h,#1,#'H,#2,#'s,#2
K.SScanFJMP		.DA K.SScanF.I
				.DA K.SScanF.D
				.DA K.SScanF.II
				.DA K.SScanF.DD
				.DA K.SScanF.L
				.DA K.SScanF.U
				.DA K.SScanF.H
				.DA K.SScanF.HH
				.DA K.SScanF.S
*--------------------------------------
K.SScanF.I		
K.SScanF.D		
K.SScanF.II
K.SScanF.DD
K.SScanF.L
K.SScanF.U		lda K.SScanFTBL+1,x		Get VAR size
				pha						Save VAL size

				jsr STDLIB.GetDec
				bra K.SScanF.GetVAL
*--------------------------------------
K.SScanF.HH
K.SScanF.H		lda K.SScanFTBL+1,x		Get VAR size
				pha

				jsr STDLIB.GetHex
				
K.SScanF.GetVAL	jsr K.SScanF.Fwd		Y=char count parsed
				
.1				ply						get back VAL size 
				
.2				lda STDLIB.32-1,y
				dey
				sta (ZPPtr3),y
				bne .2

.9				rts
*--------------------------------------
K.SScanF.S		ldy #$ff

.1				iny
				lda (ZPPtr2),y			Get char in string to scan
				sta (ZPPtr3),y			store in param ptr
				beq K.SScanF.Fwd		end of string to scan ?
				cmp (ZPPtr1)			match format next char ? 
				beq .2
				cmp #' '				is it a space ?
				bne .1
.2				lda #0					add \0 to param ptr
				sta (ZPPtr3),y
				
K.SScanF.Fwd	tya						Y=char count parsed
				clc
				adc ZPPtr2
				sta ZPPtr2
				bcc .8
				clc
				inc ZPPtr2+1
.8				rts
*/--------------------------------------
* # FOpen
* Open a file
* ## C
* `hFILE fopen ( const char * filename, short int mode, short int ftype, int auxtype );`
* **In:**
* ## ASM
* `>PUSHWI auxtype`
* `>PUSHBI ftype`
* `>PUSHBI mode`
*  + SYS.FOpen.R : if R and !exists -> ERROR
*  + SYS.FOpen.W : if W and !exists -> CREATE
*  + SYS.FOpen.A : Append
*  + SYS.FOpen.T : Open/Append in Text mode
*  + SYS.FOpen.X : Create if not exists
* http://man7.org/linux/man-pages/man3/fopen.3.html
* r  = O_RDONLY
* w  = O_WRONLY | O_CREAT | O_TRUNC
* a  = O_WRONLY | O_CREAT | O_APPEND
* r+ = O_RDWR
* w+ = O_RDWR | O_CREAT | O_TRUNC
* a+ = O_RDWR | O_CREAT | O_APPEND
*
* TODO: mode="w+t=TYP,x=AUXTYPE"
* `>LDYAI filename`
* **Out:** 
*  CC : A = hFILE
*  CS : A = EC
*\--------------------------------------
K.FOpen			jsr PFT.CheckPathYA
				jsr STDIO.SetMLIPathYA
				>PULLB K.FOpen.MODE
				>PULLB K.FOpen.TYPE
				>PULLW K.FOpen.AUXTYPE
				
K.FOpen.I		>MLICALL MLIGETFILEINFO
				bcc K.FOpen.10			Already Exists
				
				bit K.FOpen.MODE		Create if not exists ?
				bpl K.FOpen.9			No, return MLI error
				
				lda #S.FI.A.FULL				Yes, Create...
				sta K.MLI.PARAMS+3	Access
				lda K.FOpen.TYPE
				sta K.MLI.PARAMS+4	File type
				>LDYA K.FOpen.AUXTYPE
				>STYA K.MLI.PARAMS+5	Aux type
				lda #S.FI.ST.STD
				sta K.MLI.PARAMS+7
				
				ldx #3
				
.1				lda DATELO,x
				sta K.MLI.PARAMS+8,x
				dex
				bpl .1

				>MLICALL MLICREATE
				bcc K.FOpen.10
K.FOpen.9		rts

K.FOpen.10		lda #S.FD.REG
				sec
				adc K.MLI.PATH
				tay
				lda #0
				ldx #S.MEM.F.INIT0+S.MEM.F.FD
				jsr MEM.GetMem.YAX
				bcs K.FOpen.9
				
				>STYA pFD
				stx .8+1			
				
				ldx #0
				ldy #S.FD.REG
				
.1				inx
				lda K.MLI.PATH,x
				sta (pFD),y
				iny
				cpx K.MLI.PATH
				bne .1
				
				lda #0
				sta (pFD),y
				
*				ldy #S.FD.T			Done by GetMem0
*				lda #S.FD.T.REG
*				sta (pFD),y
				
				jsr STDIO.SetIOBUF
				bcs .98

				>MLICALL MLIOPEN
				bcs .98
				
				lda K.MLI.PARAMS+5		get ref_num
				ldy #S.FD.REG.REF
				sta (pFD),y
				
				sta K.MLI.PARAMS+1		Next MLI Calls are REF_NUM based
				
				lda K.FOpen.MODE
				bit #SYS.FOpen.W
				beq .20					Write mode ?
				
				and #SYS.FOpen.A		Append ?
				bne .11					yes, go to end of file
				
				stz K.MLI.PARAMS+2
				stz K.MLI.PARAMS+3
				stz K.MLI.PARAMS+4
				>MLICALL MLISETEOF		no, reset size to 0
				bra .21
				
.11				>MLICALL MLIGETEOF
				bcs .98
				
				>MLICALL MLISETMARK
.21				bcs .98
				
.20				lda K.FOpen.MODE
				and #SYS.FOpen.T		Text Mode ?
				beq .8
				
				lda #$FF
				sta K.MLI.PARAMS+2
				lda #C.CR
				sta K.MLI.PARAMS+3
				>MLICALL MLINEWLINE				
				
.8				lda #$ff				Self Modified, hFD
				clc
				rts						CC

.98				pha						save MLI error
				lda .8+1
				jsr K.FClose
				pla						get back MLI error
				sec
				rts
*--------------------------------------
K.FOpen.MODE	.BS 1
K.FOpen.TYPE	.BS 1
K.FOpen.AUXTYPE	.BS 2
*/--------------------------------------
* # FClose
* Close a file
* ## C
* int fclose ( hFILE stream );
* ## ASM
* **In:**
*  A = hFILE
* **Out:**
*\--------------------------------------
K.FClose		jsr PFT.CheckNodeA
				sta .8+1
				jsr K.GetMemPtr
				>STYA pFD

				ldy #S.FD.REG.REF
				lda (pFD),y
				beq .1
				sta K.MLI.PARAMS+1
				>MLICALL MLICLOSE

.1				ldy #S.FD.REG.IOBUF
				lda (pFD),y
				beq .8
				
				jsr K.FreeMem
				
.8				lda #$ff				Self Modified
				jmp K.FreeMem
.9				rts
*/--------------------------------------
* # FRead
* int fread (hFILE stream, void * ptr, int count );
* Read bytes from file
* **In:**
* `>PUSHWI count`
* `>PUSHW ptr`
* `lda hFILE`
* `>SYSCALL fread`
* **Out:**
*  Y,A = Bytes Read
*\--------------------------------------
K.FRead			jsr PFT.CheckNodeA
				ldx #MLIREAD
				bra K.FReadWrite.1
*/--------------------------------------
* # FWrite
* Write bytes to file
* ## C
* `int fwrite (hFILE stream, const void * ptr, int count );`
* ## ASM
* **In:**
* `>PUSHWI count`
* `>PUSHW ptr`
* `lda hFILE`
* `>SYSCALL fwrite`
* **Out:**
*  Y,A = Bytes Written
*\--------------------------------------
K.FWrite		jsr PFT.CheckNodeA
				ldx #MLIWRITE
K.FReadWrite.1	jsr STDIO.GetRefNum
				>PULLW K.MLI.PARAMS+2
				>PULLW K.MLI.PARAMS+4

				lda #4					Param Count = 4 for MLIREAD & MLIWRITE
				jsr GP.MLICall
				bcs .9
				>LDYA K.MLI.PARAMS+6
.9				rts
*/--------------------------------------
* # FFlush
* ## C
* int fflush(hFILE stream);
* ## ASM
* **In:**
*  A = hFILE
*\--------------------------------------
K.FFlush		jsr PFT.CheckNodeA
				jsr STDIO.GetRefNum
				>MLICALL MLIFLUSH
				rts
*/-------------------------------------
* # FSeek
* Set the file-position indicator for hFILE
* ## C
* `int fseek(hFILE stream, long offset, short int whence);`
* ## ASM
* **In:**
* `>PUSHBI whence`
* `>PUSHL offset`
* `lda stream`
* `>SYSCALL fseek`
*\-------------------------------------
K.FSeek			jsr PFT.CheckNodeA
				jsr STDIO.GetRefNum
				>PULLA					FROM
				tax
				>PULLW ZPPtr1			offset LW
				>PULLW ZPPtr2			offset HW
				cpx #SYS.FSeek.END+1
				bcs .98
				
				jmp (.1,x)
				
.1				.DA .10
				.DA .20
				.DA .30			
* K.FSeek.SET
.10				stz K.MLI.PARAMS+2
				stz K.MLI.PARAMS+3
				stz K.MLI.PARAMS+4
				bra .8

* K.FSeek.CUR
.20				>MLICALL MLIGETMARK
				bcc .8
				rts

* K.FSeek.END
.30				>MLICALL MLIGETEOF
				bcs .9

.8				ldy #0
				ldx #3					3 bytes, 24 bits!!!
				
				clc
				
.81				lda K.MLI.PARAMS+2,y
				adc ZPPtr1,y
				sta K.MLI.PARAMS+2,y

				iny
				dex
				bne .81
				
				bcs .99					Offset out of range!			

.82				>MLICALL MLISETMARK
				bcc .9
				cmp #MLI.E.BEYEOF
				bne .9
				>MLICALL MLISETEOF
				bcc .82
				
.9				rts

.98				lda #K.E.SYN
				.HS 2C					bit abs
.99				lda #K.E.FTB
				sec
				rts
*/--------------------------------------
* # FEOF
* Test the end-of-file indicator for hFILE
* **In:**
*  A = hFILE
* **Out:**
*  CC : 
*   A=0 EOF
*   A !=0 NOT EOF
*  CS :
*\--------------------------------------
K.FEOF			jsr PFT.CheckNodeA
				jsr STDIO.GetRefNum

				>MLICALL MLIGETMARK
				bcs .9
				
				ldy #2
				
.1				lda K.MLI.PARAMS+2,y
				sta K.FEOF.MARK,y
				dey
				bpl .1

				>MLICALL MLIGETEOF
				bcs .9

				ldy #2
				
.2				lda K.MLI.PARAMS+2,y
				eor K.FEOF.MARK,y
				bne .8
				dey
				bpl .2
				
.8				clc
.9				rts

K.FEOF.MARK		.BS 3
*/--------------------------------------
* # FTell
* Return the current value of the file-position indicator
* ## C
* `long ftell(hFILE stream);`
* ## ASM
* **In:**
* `lda stream`
* `>SYSCALL ftell`
* **Out:**
* On stack (long)
*\--------------------------------------
K.FTell			jsr PFT.CheckNodeA
				jsr STDIO.GetRefNum
				>MLICALL MLIGETMARK
				bcs .9
				
				lda #0
				>PUSHA
				
				ldy #2
				
.1				lda K.MLI.PARAMS+2,y
				>PUSHA
				dey
				bpl .1
				
.9				rts
*/--------------------------------------
* # Remove
*\--------------------------------------
K.Remove		jsr PFT.CheckPathYA
				jsr STDIO.SetMLIPathYA
				>MLICALL MLIDESTROY
				rts
*/--------------------------------------
* # Rename
* Rename a file
* ## C
* `int rename(const char *oldpath, const char *newpath);`
* ## ASM
* **In:**
* `>PUSHW newpath`
* `>LDYA oldpath`
* `>SYSCALL rename`
* **Out:**
*\--------------------------------------
K.Rename		jsr PFT.CheckPathYA
				jsr STDIO.SetMLIPathYA
				>PULLW .1+1
				
				ldy #0
				
.1				lda $ffff,y				Self Modified
				beq .8
				iny
				sta K.Buf256,y
				cpy #MLI.MAXPATH
				bne .1
				
.8				sty K.Buf256
				>LDYAI K.Buf256
				>STYA K.MLI.PARAMS+3

				>MLICALL MLIRENAME
				rts
*--------------------------------------
STDIO.SetMLIPathYA
				>STYA .1+1
				
				ldx #0
				
.1				lda $ffff,x				Self Modified
				beq .8
				inx
				sta K.MLI.PATH,x
				cpx #MLI.MAXPATH
				bne .1
				
.8				stx K.MLI.PATH
				inx
				stz K.MLI.PATH,x		Make ending 0 for /dev/xxx path

				>LDYAI K.MLI.PATH
				>STYA K.MLI.PARAMS+1
				rts
*--------------------------------------
STDIO.SetIOBUF	>LDYAI 1024				get a ProDOS IOBUF
				ldx #S.MEM.F.ALIGN+S.MEM.F.NOMOVE
				jsr MEM.GetMem.YAX
				bcs .9

				>STYA K.MLI.PARAMS+3	Save Ptr to IOBUF for MLIOPEN call
				txa
				ldy #S.FD.REG.IOBUF
				sta (pFD),y
.9				rts
*--------------------------------------
STDIO.GetRefNum	jsr K.GetMemPtr
				>STYA pFD				
				ldy #S.FD.REG.REF
				lda (pFD),y
				sta K.MLI.PARAMS+1
				rts
*--------------------------------------
STDIO.IOERR		lda #MLI.E.IO
				sec
				rts
*--------------------------------------
MAN
SAVE /A2OSX.SRC/SYS/KERNEL.S.STDIO
LOAD /A2OSX.SRC/SYS/KERNEL.S
ASM