2021-08-10 01:27:44 +00:00
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* FILESYS.S
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*********************************************************
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* AppleMOS Host File System
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*********************************************************
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* OSFIND - open/close a file for byte access
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FINDHND PHX
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PHY
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PHA
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STX ZP1 ; Points to filename
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STY ZP1+1
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CMP #$00 ; A=$00 = close
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BEQ :CLOSE
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PHA
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LDA #<MOSFILE+1
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STA ZP2
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LDA #>MOSFILE+1
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STA ZP2+1
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LDY #$00
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:L1 LDA (ZP1),Y
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>>> WRTMAIN
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STA (ZP2),Y
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>>> WRTAUX
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INY
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CMP #$0D ; Carriage return
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BNE :L1
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DEY
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>>> WRTMAIN
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STY MOSFILE ; Length (Pascal string)
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>>> WRTAUX
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PLA ; Recover options
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>>> XF2MAIN,OFILE
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:CLOSE >>> WRTMAIN
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STY MOSFILE ; Write file number
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>>> WRTAUX
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>>> XF2MAIN,CFILE
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OSFINDRET
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>>> ENTAUX
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PLY ; Value of A on entry
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CPY #$00 ; Was it close?
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BNE :S1
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TYA ; Preserve A for close
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:S1 PLY
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PLX
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RTS
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* OSGBPB - Get/Put a block of bytes to/from an open file
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GBPBHND LDA #<OSGBPBM
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LDY #>OSGBPBM
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JMP PRSTR
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OSGBPBM ASC 'OSGBPB.'
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DB $00
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* OSBPUT - write one byte to an open file
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BPUTHND PHX
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PHY
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PHA ; Stash char to write
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>>> WRTMAIN
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STY MOSFILE ; File reference number
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>>> WRTAUX
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>>> XF2MAIN,FILEPUT
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OSBPUTRET
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>>> ENTAUX
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CLC ; Means no error
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PLA
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PLY
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PLX
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RTS
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* OSBGET - read one byte from an open file
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BGETHND PHX
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PHY
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>>> WRTMAIN
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STY MOSFILE ; File ref number
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>>> WRTAUX
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>>> XF2MAIN,FILEGET
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OSBGETRET
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>>> ENTAUX
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CLC ; Means no error
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CPY #$00 ; Check error status
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BEQ :NOERR
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SEC ; Set carry for error
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BRA :EXIT
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:NOERR CLC
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:EXIT PLY
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PLX
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RTS
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* OSARGS - adjust file arguments
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* On entry, A=action
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* X=>4 byte ZP control block
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* Y=file handle
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ARGSHND PHA
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PHX
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PHY
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CPY #$00
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BNE :HASFILE
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CMP #$00 ; Y=0,A=0 => current file sys
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BNE :S1
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PLY
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PLX
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PLA
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LDA #105 ; 105=AppleFS filing system
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RTS
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:S1 CMP #$01 ; Y=0,A=1 => addr of CLI
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BNE :S2
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* TODO: Implement this for *RUN and *command
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JSR BEEP
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BRA :IEXIT
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:S2 CMP #$FF ; Y=0,A=FF => flush all files
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BNE :IEXIT
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>>> WRTMAIN
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STZ MOSFILE ; Zero means flush all
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>>> WRTAUX
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BRA :IFLUSH
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:HASFILE >>> WRTMAIN
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STY MOSFILE ; File ref num
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STX MOSFILE+1 ; Pointer to ZP control block
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>>> WRTAUX
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CMP #$00 ; Y!=0,A=0 => read seq ptr
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BNE :S3
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>>> WRTMAIN
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STZ MOSFILE+2 ; 0 means get pos
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>>> WRTAUX
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>>> XF2MAIN,TELL
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:IEXIT BRA :IEXIT2
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:IFLUSH BRA :FLUSH
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:S3 CMP #$01 ; Y!=0,A=1 => write seq ptr
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BNE :S4
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>>> WRTMAIN
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LDA $00,X
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STA MOSFILE+2
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LDA $01,X
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STA MOSFILE+3
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LDA $02,X
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STA MOSFILE+4
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>>> WRTAUX
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>>> XF2MAIN,SEEK
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:IEXIT2 BRA :EXIT
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:S4 CMP #$02 ; Y!=0,A=2 => read file len
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BNE :S5
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>>> WRTMAIN
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STA MOSFILE+2 ; Non-zero means get len
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>>> WRTAUX
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>>> XF2MAIN,TELL
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:S5 CMP #$FF ; Y!=0,A=FF => flush file
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BNE :EXIT
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:FLUSH >>> XF2MAIN,FLUSH
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:EXIT PLY
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PLX
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PLA
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RTS
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OSARGSRET
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>>> ENTAUX
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PLY
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PLX
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PLA
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RTS
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* OSFILE - perform actions on entire files
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* On entry, A=action
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* XY=>control block
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* On exit, A=preserved if unimplemented
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* A=0 object not found (not load/save)
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* A=1 file found
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* A=2 directory found
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* XY preserved
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* control block updated
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FILEHND PHX
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PHY
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PHA
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STX ZP1 ; LSB of parameter block
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STY ZP1+1 ; MSB of parameter block
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LDA #<FILEBLK
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STA ZP2
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LDA #>FILEBLK
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STA ZP2+1
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LDY #$00 ; Copy to FILEBLK in main mem
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:L1 LDA (ZP1),Y
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>>> WRTMAIN
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STA (ZP2),Y
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>>> WRTAUX
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INY
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CPY #$12
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BNE :L1
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LDA (ZP1) ; Pointer to filename->ZP2
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STA ZP2
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LDY #$01
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LDA (ZP1),Y
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STA ZP2+1
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LDA #<MOSFILE+1 ; ZP1 is dest pointer
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STA ZP1
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LDA #>MOSFILE+1
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STA ZP1+1
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LDA (ZP2) ; Look at first char of filename
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CMP #'9'+1
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BCS :NOTDIGT
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CMP #'0'
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BCC :NOTDIGT
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LDA #'N' ; Prefix numeric with 'N'
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>>> WRTMAIN
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STA (ZP1)
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>>> WRTAUX
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LDY #$01 ; Increment Y
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DEC ZP2 ; Decrement source pointer
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LDA ZP2
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CMP #$FF
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BNE :L2
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DEC ZP2+1
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BRA :L2
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:NOTDIGT LDY #$00
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:L2 LDA (ZP2),Y
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>>> WRTMAIN
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STA (ZP1),Y
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>>> WRTAUX
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INY
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CMP #$21 ; Space or Carriage return
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BCS :L2
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DEY
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>>> WRTMAIN
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STY MOSFILE ; Length (Pascal string)
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>>> WRTAUX
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PLA ; Get action back
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PHA
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BEQ :S1 ; A=00 -> SAVE
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CMP #$FF
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BEQ :S2 ; A=FF -> LOAD
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LDA #<OSFILEM ; If not implemented, print msg
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LDY #>OSFILEM
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JSR PRSTR
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PLA
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PHA
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JSR OUTHEX
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LDA #<OSFILEM2
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LDY #>OSFILEM2
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JSR PRSTR
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PLA ; Not implemented, return unchanged
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PLY
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PLX
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RTS
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:S1 >>> XF2MAIN,SAVEFILE
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:S2 >>> XF2MAIN,LOADFILE
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OSFILERET
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>>> ENTAUX
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PLY ; Value of A on entry
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CPY #$FF ; LOAD
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BNE :S4 ; Deal with return from SAVE
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CMP #$01 ; No file found
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BNE :SL1
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BRK
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DB $D6 ; $D6 = Object not found
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ASC 'File not found'
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BRK
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:SL1 CMP #$02 ; Read error
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BNE :SL2
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BRK
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DB $CA ; $CA = Premature end, 'Data lost'
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ASC 'Read error'
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BRK
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:SL2 LDA #$01 ; Return code - file found
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BRA :EXIT
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:S4 CPY #$00 ; Return from SAVE
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BNE :S6
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CMP #$01 ; Unable to create or open
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BNE :SS1
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BRK
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DB $C0 ; $C0 = Can't create file to save
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ASC 'Can'
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DB $27
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ASC 't save file'
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BRK
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:SS1 CMP #$02 ; Unable to write
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BNE :S6
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BRK
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DB $CA ; $CA = Premature end, 'Data lost'
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ASC 'Write error'
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BRK
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:S6 LDA #$00
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:EXIT PLY
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PLX
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RTS
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OSFILEM ASC 'OSFILE($'
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DB $00
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OSFILEM2 ASC ')'
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DB $00
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* OSFSC - miscellanous file system calls
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*****************************************
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* On entry, A=action, XY=>command line
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* or A=action, X=param1, Y=param2
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* On exit, A=preserved if unimplemented
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* A=modified if implemented
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* X,Y=any return values
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*
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2021-08-15 05:26:01 +00:00
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FSCHND CMP #$00
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BEQ FSOPT ; A=0 - *OPT
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CMP #$01
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BEQ CHKEOF ; A=1 - Read EOF
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2021-08-10 01:27:44 +00:00
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CMP #$02
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BEQ FSCRUN ; A=2 - */filename
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CMP #$04
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BEQ FSCRUN ; A=4 - *RUN
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CMP #$05
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BEQ FSCCAT ; A=5 - *CAT
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CMP #$09
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BEQ FSCCAT ; A=9 - *EX
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CMP #$0A
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BEQ FSCCAT ; A=10 - *INFO
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CMP #$0C
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BEQ FSCREN ; A=12 - *RENAME
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2021-08-19 01:02:07 +00:00
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FSCRUN STX OSFILECB ; Pointer to filename
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STY OSFILECB+1
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LDA #$FF ; OSFILE load flag
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STA OSFILECB+6 ; Use file's address
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LDX #<OSFILECB ; Pointer to control block
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LDY #>OSFILECB
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JSR OSFILE
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2021-08-19 03:45:52 +00:00
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* JMP (AUXBLK) ; DOESN'T WORK AS EXPECTED!!!
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2021-08-19 01:02:07 +00:00
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RTS
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2021-08-10 01:27:44 +00:00
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FSCREN
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LDA #<OSFSCM
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LDY #>OSFSCM
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JSR PRSTR
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RTS
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OSFSCM ASC 'OSFSC.'
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DB $00
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2021-08-15 05:26:01 +00:00
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* Performs OSFSC *OPT function
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FSOPT RTS ; No FS options for now
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2021-08-10 01:27:44 +00:00
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* Performs OSBYTE $7F EOF function
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* File ref number is in X
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CHKEOF >>> WRTMAIN
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STX MOSFILE ; File reference number
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>>> WRTAUX
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>>> XF2MAIN,FILEEOF
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CHKEOFRET
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>>> ENTAUX
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TAX ; Return code -> X
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RTS
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* Perform CAT
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* A=5 *CAT, A=9 *EX, A=10 *INFO
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FSCCAT >>> XF2MAIN,CATALOG
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STARCATRET
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>>> ENTAUX
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JMP OSNEWL
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RTS
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* Print one block of a catalog. Called by CATALOG
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* Block is in AUXBLK
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PRONEBLK >>> ENTAUX
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LDA AUXBLK+4 ; Get storage type
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AND #$E0 ; Mask 3 MSBs
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CMP #$E0
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BNE :NOTKEY ; Not a key block
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LDA #<:DIRM
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LDY #>:DIRM
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JSR PRSTR
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SEC
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:NOTKEY LDA #$00
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:L1 PHA
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PHP
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JSR PRONEENT
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PLP
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|
BCC :L1X
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JSR OSNEWL
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:L1X PLA
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|
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INC
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|
|
CMP #13 ; Number of dirents in block
|
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|
CLC
|
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|
|
|
BNE :L1
|
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|
|
|
>>> XF2MAIN,CATALOGRET
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|
|
:DIRM ASC 'Directory: '
|
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|
|
DB $00
|
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|
|
|
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|
|
* Print a single directory entry
|
|
|
|
|
* On entry: A = dirent index in AUXBLK
|
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|
|
|
PRONEENT TAX
|
|
|
|
|
LDA #<AUXBLK+4 ; Skip pointers
|
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|
|
STA ZP3
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|
|
LDA #>AUXBLK+4
|
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|
|
STA ZP3+1
|
|
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|
|
:L1 CPX #$00
|
|
|
|
|
BEQ :S1
|
|
|
|
|
CLC
|
|
|
|
|
LDA #$27 ; Size of dirent
|
|
|
|
|
ADC ZP3
|
|
|
|
|
STA ZP3
|
|
|
|
|
LDA #$00
|
|
|
|
|
ADC ZP3+1
|
|
|
|
|
STA ZP3+1
|
|
|
|
|
DEX
|
|
|
|
|
BRA :L1
|
|
|
|
|
:S1 LDY #$00
|
|
|
|
|
LDA (ZP3),Y
|
|
|
|
|
BEQ :EXIT ; Inactive entry
|
|
|
|
|
AND #$0F ; Len of filename
|
|
|
|
|
TAX
|
|
|
|
|
LDY #$01
|
|
|
|
|
:L2 CPX #$00
|
|
|
|
|
BEQ :S2
|
|
|
|
|
LDA (ZP3),Y
|
|
|
|
|
JSR OSWRCH
|
|
|
|
|
DEX
|
|
|
|
|
INY
|
|
|
|
|
BRA :L2
|
|
|
|
|
:S2 LDA #$20
|
|
|
|
|
JSR OSWRCH
|
|
|
|
|
INY
|
|
|
|
|
CPY #$15
|
|
|
|
|
BNE :S2
|
|
|
|
|
:EXIT RTS
|
|
|
|
|
|
|
|
|
|
* Handle *DIR (directory change) command
|
|
|
|
|
* On entry, ZP1 points to command line
|
|
|
|
|
STARDIR JSR EATSPC ; Eat leading spaces
|
|
|
|
|
BCC :S1 ; If no space found
|
|
|
|
|
RTS ; No argument
|
|
|
|
|
:S1 LDX #$01
|
|
|
|
|
:L3 LDA (ZP1),Y
|
|
|
|
|
CMP #$0D
|
|
|
|
|
BEQ :S3
|
|
|
|
|
>>> WRTMAIN
|
|
|
|
|
STA MOSFILE,X
|
|
|
|
|
>>> WRTAUX
|
|
|
|
|
INY
|
|
|
|
|
INX
|
|
|
|
|
BRA :L3
|
|
|
|
|
:S3 DEX
|
|
|
|
|
>>> WRTMAIN
|
|
|
|
|
STX MOSFILE ; Length byte
|
|
|
|
|
>>> WRTAUX
|
|
|
|
|
>>> XF2MAIN,SETPFX
|
|
|
|
|
STARDIRRET
|
|
|
|
|
>>> ENTAUX
|
|
|
|
|
RTS
|
|
|
|
|
|
