337 lines
9.7 KiB
ArmAsm
337 lines
9.7 KiB
ArmAsm
* MAINMEM.PATH.S
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* (c) Bobbi 2021 GPLv3
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*
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* Code for handling Applecorn paths and converting them to
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* ProDOS paths. Runs in main memory.
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* TO DO: check range in :sd
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* TO DO: need separate reference to current root and drive by name
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* TO DO: check for pathname too long
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* ie /filename should be filename in root
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* Preprocess path in MOSFILE, handles:
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* 1) ':sd' type slot and drive prefix (s,d are digits)
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* 2) '.' or '@' for current working directory
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* 3) '..' or '^' for parent directory
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* Carry set on error, clear otherwise
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PREPATH LDX MOSFILE ; Length
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BNE :S1
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JMP :EXIT ; If zero length
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:S1 LDA MOSFILE+1 ; 1st char of pathname
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CMP #':'
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BNE :NOTCOLN ; Not colon
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CPX #$03 ; Length >= 3?
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BCS :S2
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JMP :ERR ; If not
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:S2 LDA MOSFILE+3 ; Drive
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SEC
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SBC #'1'
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TAX
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LDA MOSFILE+2 ; Slot
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SEC
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SBC #'0'
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JSR DRV2PFX ; Slot/drv->pfx in PREFIX
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JSR DEL1CHAR ; Delete ':' from MOSFILE
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JSR DEL1CHAR ; Delete slot from MOSFILE
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JSR DEL1CHAR ; Delete drive from MOSFILE
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LDA MOSFILE ; Is there more?
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BEQ :APPEND ; Only ':sd'
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CMP #$02 ; Length >= 2
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BCC :ERR ; If not
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LDA MOSFILE+1 ; 1st char of filename
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CMP #'/'
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BNE :ERR
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JSR DEL1CHAR ; Delete '/' from MOSFILE
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BRA :APPEND
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:NOTCOLN JSR GETPREF ; Current pfx -> PREFIX
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:REENTER LDA MOSFILE+1 ; First char of dirname
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CMP #'@' ; '@' means current working dir
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BEQ :CWD
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CMP #'^' ; '^' means parent dir
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BEQ :CARET
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CMP #'/' ; Absolute path
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BEQ :EXIT ; Nothing to do
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CMP #'.' ; ...
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BEQ :UPDIR1
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BRA :APPEND
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:UPDIR1 LDA MOSFILE ; Length
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CMP #$01
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BEQ :CWD ; '.' on its own
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LDA MOSFILE+2
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CMP #'.' ; '..'
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BEQ :DOTDOT
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CMP #'/' ; './'
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BEQ :CWD
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BRA :ERR
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:DOTDOT JSR DEL1CHAR ; Delete first char of MOSFILE
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:CARET JSR PARENT ; Parent dir -> PREFIX
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:CWD JSR DEL1CHAR ; Delete first char of MOSFILE
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LDA MOSFILE ; Is there more?
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BEQ :APPEND ; No more
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CMP #$02 ; Len at least two?
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BCC :ERR ; Too short!
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LDA MOSFILE+1 ; What is next char?
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CMP #'/' ; Is it slash?
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BNE :ERR ; Nope!
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JSR DEL1CHAR ; Delete '/' from MOSFILE
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BRA :REENTER ; Go again!
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:APPEND JSR APFXMF ; Append MOSFILE->PREFIX
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JSR PFXtoMF ; Copy back to MOSFILE
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:EXIT JSR DIGCONV ; Handle initial digits
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JSR USCONV ; Handle any underscores
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CLC
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RTS
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:ERR LDA #$40 ; $40=Bad filename
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SEC
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RTS
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* Convert path in PREFIX by removing leaf dir to leave
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* parent directory. If already at top, return unchanged.
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PARENT LDX PREFIX ; Length of string
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BEQ :EXIT ; Prefix len zero
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DEX ; Ignore trailing '/'
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:L1 LDA PREFIX,X
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CMP #'/'
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BEQ :FOUND
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DEX
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CPX #$01
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BNE :L1
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BRA :EXIT ; No slash found
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:FOUND STX PREFIX ; Truncate string
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:EXIT RTS
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* Convert slot/drive to prefix
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* Expect slot number (1..7) in A, drive (0..1) in X
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* Puts prefix (or empty string) in PREFIX
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DRV2PFX CLC ; Cy=0 A=00000sss
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ROR A ; s 000000ss
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ROR A ; s s000000s
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ROR A ; s ss000000
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ROR A ; 0 sss00000
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CPX #1 ; d sss00000
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ROR A ; 0 dsss0000
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STA ONLNPL+1 ; Device number
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JSR MLI ; Call ON_LINE
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DB ONLNCMD
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DW ONLNPL ; Buffer set to DRVBUF2 (was $301)
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LDA DRVBUF2 ; Slot/Drive/Length
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AND #$0F ; Mask to get length
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TAX
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INC ; Plus '/' at each end
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INC
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STA PREFIX ; Store length
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LDA #'/'
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STA PREFIX+1
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STA PREFIX+2,X
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:L1 CPX #$00 ; Copy -> PREFIX
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BEQ :EXIT
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LDA DRVBUF2,X
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STA PREFIX+1,X
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DEX
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BRA :L1
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:EXIT RTS
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* Delete first char of MOSFILE
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DEL1CHAR LDX MOSFILE ; Length
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BEQ :EXIT ; Nothing to delete
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LDY #$02 ; Second char
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:L1 CPY MOSFILE
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BEQ :S2 ; If Y=MOSFILE okay
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BCS :S1 ; If Y>MOSFILE done
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:S2 LDA MOSFILE,Y
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STA MOSFILE-1,Y
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INY
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BRA :L1
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:S1 DEC MOSFILE
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:EXIT RTS
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* Append MOSFILE to PREFIX
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APFXMF LDY PREFIX ; Length of PREFIX
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LDX #$00 ; Index into MOSFILE
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:L1 CPX MOSFILE ; Length of MOSFILE
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BEQ :DONE
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LDA MOSFILE+1,X
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STA PREFIX+1,Y
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INX
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INY
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BRA :L1
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:DONE STY PREFIX ; Update length PREFIX
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RTS
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* Scan pathname in MOSFILE converting '_' to '.'
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USCONV LDX MOSFILE ; Length
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BEQ :EXIT ; Nothing to replace
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:L1 LDA MOSFILE,X
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CMP #'_'
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BNE :S1
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LDA #'.'
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STA MOSFILE,X
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:S1 DEX
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BNE :L1
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:EXIT RTS
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* Scan pathname in MOSFILE converting files/dirs
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* starting with digit by adding 'N' before.
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DIGCONV LDY #$01 ; First char
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:L1 CPY MOSFILE ; String length
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BEQ :KEEPON ; Last char
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BCS :DONE ; Y>MOSFILE
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:KEEPON LDA MOSFILE,Y ; Load char
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JSR ISDIGIT ; Is it a digit?
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BCC :NOINS ; No .. skip
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CPY #$01 ; First char?
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BEQ :INS ; First char is digit
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LDA MOSFILE-1,Y ; Prev char
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CMP #'/' ; Slash
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BEQ :INS ; Slash followed by digit
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BRA :NOINS ; Otherwise leave it alone
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:INS LDA #'N' ; Char to insert
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JSR INSMF ; Insert it
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INY
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:NOINS INY ; Next char
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BRA :L1
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:DONE RTS
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* Is char in A a digit? Set carry if so
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ISDIGIT CMP #'9'+1
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BCS :NOTDIG
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CMP #'0'
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BCC :NOTDIG
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SEC
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RTS
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:NOTDIG CLC
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RTS
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* Insert char in A into MOSFILE at posn Y
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* Preserves regs
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INSMF PHA ; Preserve char
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STY :INSIDX ; Stash index for later
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LDY MOSFILE ; String length
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INY ; Start with Y=len+1
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:L1 CPY :INSIDX ; Back to ins point?
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BEQ :S1 ; Yes, done moving
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LDA MOSFILE-1,Y ; Move one char
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STA MOSFILE,Y
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DEY
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BRA :L1
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:S1 PLA ; Char to insert
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STA MOSFILE,Y ; Insert it
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INC MOSFILE ; One char longer
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RTS
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:INSIDX DB $00
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* Copy Pascal-style string
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* Source in A1L/A1H, dest in A4L/A4H
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STRCPY LDY #$00
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LDA (A1L),Y ; Length of source
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STA (A4L),Y ; Copy length byte
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TAY
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:L1 CPY #$00
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BEQ :DONE
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LDA (A1L),Y
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STA (A4L),Y
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DEY
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BRA :L1
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:DONE RTS
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* Copy MOSFILE to MFTEMP
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MFtoTMP LDA #<MOSFILE
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STA A1L
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LDA #>MOSFILE
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STA A1H
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LDA #<MFTEMP
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STA A4L
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LDA #>MFTEMP
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STA A4H
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JSR STRCPY
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RTS
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* Copy MFTEMP to MOSFILE
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TMPtoMF LDA #<MFTEMP
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STA A1L
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LDA #>MFTEMP
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STA A1H
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LDA #<MOSFILE
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STA A4L
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LDA #>MOSFILE
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STA A4H
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JSR STRCPY
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RTS
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* Copy MFTEMP to MOSFILE2
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TMPtoMF2 LDA #<MFTEMP
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STA A1L
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LDA #>MFTEMP
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STA A1H
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LDA #<MOSFILE2
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STA A4L
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LDA #>MOSFILE2
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STA A4H
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JSR STRCPY
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RTS
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* Copy MOSFILE to MOSFILE2
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COPYMF12 LDA #<MOSFILE
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STA A1L
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LDA #>MOSFILE
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STA A1H
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LDA #<MOSFILE2
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STA A4L
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LDA #>MOSFILE2
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STA A4H
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JSR STRCPY
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RTS
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* Copy MOSFILE2 to MOSFILE
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COPYMF21 LDA #<MOSFILE2
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STA A1L
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LDA #>MOSFILE2
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STA A1H
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LDA #<MOSFILE
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STA A4L
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LDA #>MOSFILE
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STA A4H
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JSR STRCPY
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RTS
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* Copy PREFIX to MOSFILE
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PFXtoMF LDA #<PREFIX
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STA A1L
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LDA #>PREFIX
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STA A1H
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LDA #<MOSFILE
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STA A4L
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LDA #>MOSFILE
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STA A4H
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JSR STRCPY
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RTS
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MFTEMP DS 65 ; Temp copy of MOSFILE
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PREFIX DS 65 ; Buffer for ProDOS prefix
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