Applecorn/mainmem.wild.s

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* MAINMEM.WILD.S
* (c) Bobbi 2021 GPLv3
*
* Wildcard support
* Scan path in MOSFILE, break it into segments (ie: chunks delimited
* by '/'), and for each segment see if it contains wildcard chars.
* If so, pass it to SRCHDIR to expand the wildcard. If not, just
* append the segment as it is. Uses MFTEMP to build up the path.
* Returns with carry set if wildcard match fails, clear otherwise
WILDCARD
STZ :LAST
LDX #$00 ; Start with first char
STX MFTEMP ; Clear MFTEMP (len=0)
PHX
:L1 PLX
JSR SEGMENT ; Extract segment of pathname
BCC :NOTLST
DEC :LAST
:NOTLST PHX
LDA SEGBUF ; Length of segment
BNE :S1 ; Check for zero length segments
LDA :LAST ; If not the last segment ...
BEQ :L1 ; ... go again
:S1 JSR HASWILD ; See if it has '*'/'#'/'?'
BCS :WILD ; It does
JSR APPSEG ; Not wild: Append SEGBUF to MFTEMP
BRA :NEXT
:WILD LDX #<MFTEMP ; Invoke SRCHDIR to look for pattern
LDY #>MFTEMP ; in the directory path MFTEMP
JSR SRCHDIR
BCS :NOMATCH ; Wildcard did not match anything
JSR APPSEG ; Append modified SEGBUF to MFTEMP
:NEXT LDA :LAST
BEQ :L1
PLX
JSR TMPtoMF ; Copy the path we built to MOSFILE
CLC
RTS
:NOMATCH PLX
SEC
RTS
:LAST DB $00 ; Flag for last segment
* Copy a segment of the path into SEGBUF
* PREPATH makes all paths absolute, so always begins with '/'
* On entry: X contains index of first char in MOSFILE to process
* Set carry if no more segments, clear otherwise
SEGMENT LDY #$00
:L1 CPX MOSFILE ; See if we are done
BEQ :NOMORE
LDA MOSFILE+1,X
CMP #'/'
BEQ :DONE
STA SEGBUF+1,Y
INX
INY
BRA :L1
:DONE STY SEGBUF ; Record the length
LDA #$00
STA SEGBUF+1,Y ; Null terminate for MATCH
INX ; Skip the slash
CLC ; Not the last one
RTS
:NOMORE STY SEGBUF ; Record the length
LDA #$00
STA SEGBUF+1,Y ; Null terminate for MATCH
SEC ; Last segment
RTS
* See if SEGBUF contains any of '*', '#', '?'
* Set carry if wild, clear otherwise
HASWILD LDX #$00
:L1 CPX SEGBUF ; At end?
BEQ :NOTWILD
LDA SEGBUF+1,X
CMP #'*'
BEQ :WILD
CMP #'#'
BEQ :WILD
CMP #'?'
BEQ :WILD
INX
BRA :L1
:NOTWILD CLC
RTS
:WILD SEC
RTS
* Append SEGBUF to MFTEMP
APPSEG LDY MFTEMP ; Dest idx = length
LDA #'/' ; Add a '/' separator
STA MFTEMP+1,Y
INY
LDX #$00 ; Source idx
:L1 CPX SEGBUF ; At end?
BEQ :DONE
LDA SEGBUF+1,X
STA MFTEMP+1,Y
INX
INY
BRA :L1
:DONE STY MFTEMP ; Update length
RTS
* Read directory, apply wildcard match
* Inputs: directory name in XY (Pascal string)
* If there is a match, replaces SEGBUF with the first match and CLC
* If no match, or any other error, returns with carry set
SRCHDIR STX OPENPL+1
STY OPENPL+2
JSR OPENFILE
BCS :NODIR
LDA OPENPL+5 ; File ref num
STA READPL+1
:L1 JSR RDFILE ; Read->BLKBUF
BCC :S1
CMP #$4C ; EOF
BEQ :EOF
BRA :BADDIR
:S1 JSR SRCHBLK ; Handle one block
BCS :MATCH
BRA :L1
:MATCH CLC
PHP
BRA :CLOSE
:BADDIR
:EOF SEC
PHP
:CLOSE LDA OPENPL+5
STA CLSPL+1
JSR CLSFILE
PLP
RTS
:NODIR SEC
RTS
* Apply wildcard match to a directory block
* Directory block is in BLKBUF
* On exit: set carry if match, clear carry otherwise
SRCHBLK LDA BLKBUF+4 ; Obtain storage type
AND #$E0 ; Mask 3 MSBs
CMP #$E0
BNE :NOTKEY
LDX #$01 ; Skip dir name
BRA :L1
:NOTKEY LDX #$00
:L1 PHX
JSR MATCHENT
PLX
BCS :MATCH
INX
CPX #13 ; Number of dirents in block
BNE :L1
CLC ; Fell off end, no match
:MATCH RTS
* Apply wildcard match to a directory entry
* On entry: X = dirent index in BLKBUF
* On exit: set carry if match, clear carry otherwise
MATCHENT LDA #<BLKBUF+4 ; Skip pointers
STA A1L
LDA #>BLKBUF+4
STA A1H
:L1 CPX #$00
BEQ :S1
CLC
LDA #$27 ; Size of dirent
ADC A1L
STA A1L
LDA #$00
ADC A1H
STA A1H
DEX
BRA :L1
:S1 LDY #$00
LDA (A1L),Y ; Length byte
BEQ :NOMATCH ; Inactive entry
INC A1L ; Inc ptr, skip length byte
BNE :S2
INC A1H
:S2 JSR MATCH ; Try wildcard match
BCC :NOMATCH
LDA A1L ; Decrement ptr again
BNE :S3
DEC A1H
:S3 DEC A1L
LDY #$00 ; If matches, copy matching filename
LDA (A1L),Y ; Length of filename
AND #$0F ; Mask out other ProDOS stuff
STA SEGBUF
TAY
:L2 CPY #$00
BEQ :MATCH
LDA (A1L),Y
STA SEGBUF,Y
DEY
BRA :L2
:MATCH SEC
RTS
:NOMATCH CLC
RTS
* From: http://6502.org/source/strings/patmatch.htm
* Input: A NUL-terminated, <255-length pattern at address PATTERN.
* A NUL-terminated, <255-length string pointed to by STR.
* Output: Carry bit = 1 if the string matches the pattern, = 0 if not.
* Notes: Clobbers A, X, Y. Each * in the pattern uses 4 bytes of stack.
MATCH1 EQU '?' ; Matches exactly 1 character
MATCHN EQU '*' ; Matches any string (including "")
PATTERN EQU SEGBUF+1 ; Address of pattern
STR EQU A1L ; Pointer to string to match
MATCH LDX #$00 ; X is an index in the pattern
LDY #$FF ; Y is an index in the string
:NEXT LDA PATTERN,X ; Look at next pattern character
CMP #MATCHN ; Is it a star?
BEQ :STAR ; Yes, do the complicated stuff
INY ; No, let's look at the string
CMP #MATCH1 ; Is the pattern caracter a ques?
BNE :REG ; No, it's a regular character
LDA (STR),Y ; Yes, so it will match anything
BEQ :FAIL ; except the end of string
:REG CMP (STR),Y ; Are both characters the same?
BNE :FAIL ; No, so no match
INX ; Yes, keep checking
CMP #0 ; Are we at end of string?
BNE :NEXT ; Not yet, loop
:FOUND RTS ; Success, return with C=1
:STAR INX ; Skip star in pattern
CMP PATTERN,X ; String of stars equals one star
BEQ :STAR ; so skip them also
:STLOOP TXA ; We first try to match with * = ""
PHA ; and grow it by 1 character every
TYA ; time we loop
PHA ; Save X and Y on stack
JSR :NEXT ; Recursive call
PLA ; Restore X and Y
TAY
PLA
TAX
BCS :FOUND ; We found a match, return with C=1
INY ; No match yet, try to grow * string
LDA (STR),Y ; Are we at the end of string?
BNE :STLOOP ; Not yet, add a character
:FAIL CLC ; Yes, no match found, return with C=0
RTS
SEGBUF DS 65 ; For storing path segments (Pascal str)
; Length needs to be >= 15
; TODO: No overflow check