A2osX/ProDOS.FX/ProDOS.S.XDOS.B.txt

NEW
  AUTO 3,1
*--------------------------------------
findfile 		jsr lookfile			see if file exists
				bcs nofind

moventry 		ldy h_entln				Get FileInfo From Directory Block Buffer

.1  			dey
				lda (zpt),y				move entry into storage
				sta d_stor,y
				tya
				bne .1

nofind 			rts
*--------------------------------------
lookfile 		jsr preproot			go find volume
				bcs fnderr

				bne lookfil0			branch if more than root

				lda /gbuf			 	otherwise, report a bad path error
				sta zpt+1			  	(but 1st create a phantom entry
				lda #$04			 	for open)
				sta zpt

				ldy #$1F				move in id and date info

phantm1  		lda (zpt),y
				sta d_stor,y
				dey
				cpy #$17
				bne phantm1

phantm2  		lda rootstuf-$10,y
				sta d_stor,y
				dey
				cpy #$0F
				bne phantm2

				lda #$D0				fake directory file
				sta d_stor
				lda gbuf+2			 	check forward link.
				ora gbuf+3			 	if non-zero, assume full sized directory
				bne H37C2			 	else assume it's the slot 3 /RAM volume

				lda #$02			 	so reset eof and blocks_used fields
				sta d_eof+1
				lda #$01
				sta d_usage

H37C2  			lda #MLI.E.INVPATH		bad path (carry set)
				rts
*--------------------------------------
lookfil0		stz nofree				reset free entry indicator.
				sec		 				dir to be searched has header in this block.
L37C9  			stz totent			 	reset entry counter.

				jsr XDOS.LookupNameInDirBlk		look for name pointed to by pnptr.
				bcc namfound			if name was found.

				lda entcntl				have we looked at all of the
				sbc totent			 	entries in this directory?
				bcc L37E2			  	maybe, check hi count.
				bne L37EB			  	no, read next directory block.

				cmp entcnth				has the last entry been looked at?
				beq errfnf			 	yes, give 'file not found' error
				bne L37EB				or branch always.

L37E2  			dec entcnth				should be at least one
				bpl L37EB			  	so this should be branch always...

errdir 			lda #MLI.E.BADDIR	 	directory error
fnderr 			sec
				rts

L37EB  			sta entcntl				keep a running count.
				lda /gbuf			 	reset indirect pointer
				sta zpt+1

				lda gbuf+2			 	get link to next dir block
				bne L37FC			  	(if there is one).

				cmp gbuf+3			 	are both zero, i.e. no link? if so,
				beq errdir			 	then not all entries were acct'd for.

L37FC  			ldx gbuf+3			 	acc has value for block# (low).
				jsr rdblk			  	go read the next linked directory.
				bcc L37C9			  	if no error.
				rts		 				return error in acc.

errfnf 			lda nofree				was any free entry found?
				bne fnf0
				lda gbuf+2			 	test link
				bne L3814
				cmp gbuf+3			 	if both are 0 then give up.
				beq fnf0			 	report 'not found'.

L3814  			sta d_entblk
				lda gbuf+3
				sta d_entblk+1			assume 1st entry of next block
				lda #$01			 	is free for use.
				sta d_entnum			mark as valid (for create)
				sta nofree

fnf0   			jsr nxtpnam1			'file not found' or 'path not found'?
errpath1 		beq .1					if non-zero then 'path not found'

				lda #MLI.E.PNOTFND		path not found
				.HS 2C					BIT ABS

.1   			lda #MLI.E.FNOTFND	 	file not found
				sec
				rts
*--------------------------------------
namfound 		jsr nxtpname			adj index to next name in path.
				beq filfound			branch if that was the last name.

				ldy #$00			 	be sure this is a directory entry.
				lda (zpt),y				high nibble will tell.
				and #$F0
				cmp #$D0			 	is it a subdirectory?
				bne errpath1			error if not.

				ldy #$11			 	get address of 1st subdirectory block
				lda (zpt),y
				sta bloknml				(no checking done for a valid block#)
				iny
				sta d_head			 	save as file's header block too
				lda (zpt),y
				sta bloknml+1
				sta d_head+1

				jsr rdgbuf			 	read subdirectory into gbuf.
				bcs L389C				if error.

				lda gbuf+37				get the # of files contained in this
				sta entcntl				directory.
				lda gbuf+38
				sta entcnth
*--------------------------------------
* Check if $75 at VOL/DIR entry + $14
* (8 bytes reserved)
*--------------------------------------
				.DO LOWERCASE=0
				lda gbuf+20				make sure password is disabled

				ldx #$00
				sec
				rol
L3869  			bcc L386C

				inx
L386C  			asl
				bne L3869

				cpx #$05				is password disabled?
				beq movhead

				lda #MLI.E.INCFF	 	directory is not compatible
				sec
				rts
				.FIN
*--------------------------------------
movhead  		jsr movhed0				move directory info.
				jmp lookfil0			do next local pathname.

movhed0			ldx #$0A				move this directory info

L387F  			lda gbuf+28,x
				sta h_credt,x
				dex
				bpl L387F

				lda gbuf+4				if this is root, then nothing to do
				and #$F0
				eor #$F0			 	test header type.
				beq L389C			  	branch if root

				ldx #$03			 	otherwise, save owner info about

L3893  			lda gbuf+39,x			this header.
				sta own_blk,x
				dex
				bpl L3893

L389C  			rts
*--------------------------------------
filfound 		lda h_maxent			figure out which entry # this is
				sec
				sbc cntent			 	max entries - count entries + 1
				adc #$00			 	= entry # (carry was set)
				sta d_entnum
				lda bloknml				and indicate block # of this directory
				sta d_entblk
				lda bloknml+1
				sta d_entblk+1
				clc
				rts
*--------------------------------------
XDOS.LookupNameInDirBlk
				lda h_maxent			reset count of files per block
				sta cntent

				lda /gbuf
				sta zpt+1
				lda #$04

L38C1  			sta zpt			  		reset indirect pointer to gbuf
				bcs L38F8				branch if this block contains a header

				ldy #$00
				lda (zpt),y				get length of name in directory.
				bne isname				branch if there is a name.

				lda nofree				test if a free entry has been declared.
				bne L38F8			  	yes, inc to next entry.

				jsr filfound			set address for current entry.

				inc nofree				indicate a free spot has been found.
				bra L38F8

isname 			and #$0F			 	strip byte (is checked by 'filfound')
				inc totent				inc count of valid files found.
				sta namcnt				save name length as counter.

				ldx namptr			 	get index to current path.
				cmp pathbuf,x			are both names the same length?
				bne L38F8			  	no, inc to next entry.

cmpname  		inx		 				(first) next letter index
				iny

				.DO LOWERCASE=1
				phy
				cpy #8					CS if MIN_VERSION to use
				
				ldy #$1C				VERSION
				lda (zpt),y
				bpl .4					no lowercase information
				
				bcs .1					

				ply
				and whichbit,y
				beq .5					UPPERCASE

				bra .2
				
.1				iny						MIN_VERSION
				lda (zpt),y
				
				ply
				and whichbit-8,y
				beq .5

.2				lda (zpt),y
				jsr XDOS.ToLower
				bra .6
				
.4				ply
				.FIN
.5				lda (zpt),y				compare names letter by letter	
.6				cmp pathbuf,x
				bne L38F8

				dec namcnt			 	all letters compared?
				bne cmpname				no, continue.

				clc		 				a match is found.
noname 			rts

L38F8  			dec cntent				checked all entries in this block?
				sec
				beq noname			 	yes, no name match.
				lda h_entln				add entry length to current pointer
				clc
				adc zpt
				bcc L38C1			  	branch if still in 1st page.

				inc zpt+1			  	look on 2nd page.
				clc		 				carry should always be clear before
				bra L38C1			  	looking at next.
*--------------------------------------
preproot 		jsr findvol				search vcb's and dev's for spec'd volume
				bcs novolume

				ldx #$42				zero out directory temps

L3914  			stz own_blk,x			and owner info
				dex
				bpl L3914

				lda devnum			 	setup device # for this directory
				sta d_dev
				jsr movhed0				setup other header info from directory

				ldy #$01			 	in gbuf and clean up misc info.
				ldx vcbptr
				inx

L3929  			lda vcbbuf+18,x			misc info includes
				sta h_tblk,y			total # of blocks,
				lda vcbbuf+26,x			the address of the 1st bitmap,
				sta h_bmap,y
				lda	bloknml,y			directory's disk address,
				sta d_head,y
				lda h_fcnt,y			and setting up a counter for the # of
				sta entcntl,y			files in this directory.
				dex
				dey
				bpl L3929
				
nxtpname 		jsr nxtpnam1			get new namptr in y and namlen in acc.
				sty namptr			 	save new pathname pointer.
				rts		 				(status reg according to accumulator)

nxtpnam1 		ldy namptr			 	inc pathname pointer to next name
				lda pathbuf,y			in the path.
				sec
				adc namptr			 	if this addition results in zero,
				tay		 				then prefixed directory has been moved
				bne L395F			  	to another device. branch if not.

				lda devnum			 	revise devnum for prefixed directory
				sta p_dev

L395F  			lda pathbuf,y			test for end of name.
				clc						no errors
novolume 		rts
*--------------------------------------
findvol	 		lda #$00
				ldy preflag				use prefix volume name to look up vcb.
				bit prfxflg				is this a prefixed path?
				bpl L396F			 	branch if it is

				tay		 				set ptr to volume name

L396F  			sty vnptr			  	and save.
				sta devnum			 	zero out dev# until vcb located.

L3975 			pha		 				acc now used as vcb lookup index.
				tax		 				index pointer to x.
				lda vcbbuf,x			get vcb volume name length.
				bne L3987			  	branch if claimed vcb to be tested.

L397C 			ldy vnptr			  	restore pointer to requested vol name.
				pla		 				now adj vcb index to next vcb entry.
				clc
				adc #$20
				bcc L3975			  	branch if more vcb's to check
				bcs L39D4			  	otherwise go look for unlogged volumes.

L3987  			sta namcnt			 	save length of vol name to be compared.

L398A  			cmp pathbuf,y			is it the same as requested vol name?
				bne L397C			  	branch if not

				inx
				iny		 				next character
				lda vcbbuf,x
				dec namcnt			 	last character?
				bpl L398A			  	if not.

				plx		 				restore pointer to matching vcb.
				stx vcbptr			 	save it for future reference.
				lda vcbbuf+16,x			get it's device #
				sta devnum			 	and save it.
				stz bloknml+1			assume prefix is not used and
				lda #$02			 	that root directory is to be used.
				sta bloknml
				lda vnptr			  	= 0 if no prefix.

L39AC  			tay		 				if prefix then find ptr to prefixed
				sta namptr			 	dir name. save path ptr.
				beq L39C2			  	branch if no prefix.
				sec
				adc pathbuf,y			inc to next dir in prefix path.
				bcc L39AC			  	branch if another dir in prefix.

				lda p_blok			 	volume verification will occur at
				sta bloknml				subdirectory level.
				lda p_blok+1
				sta bloknml+1

* verify volume name

L39C2  			jsr rdgbuf				read in directory (or prefix dir)
				bcs L39CC			  	if error then look on other devices.

				jsr XDOS.CheckVolName	compare dir name with path name.
				bcc L39F0			  	if they match, stop looking.

L39CC  			ldx vcbptr			 	check if current (matched) vcb is active
				lda vcbbuf+17,x			i.e. does it have open files?
				bmi L39ED			  	report not found if active.

L39D4  			lda vnptr			  	make path ptr same as volume ptr
				sta namptr
				jsr mvdevnums			copy all device #'s to be examined.
				lda devnum			 	log current device 1st before searching
				bne L39F1			  	others.

L39E2  			ldx DEVCNT				scan look list for devices we need

L39E5  			lda loklst,x			to search for the requested volume.
				bne L39F4			  	branch if we've a device to look at.
				dex
				bpl L39E5			  	look at next one.

L39ED  			lda #MLI.E.VNOTFND	 	no mounted volume
				sec						error
L39F0  			rts

L39F1  			ldx DEVCNT				now remove the device from the list

L39F4  			cmp loklst,x			of prospective devices.
				beq L39FE			  	branch if match.
				dex		 				look until found.
				bpl L39F4			  	always taken (usually) unless
				bmi L39ED			  	if dev was removed from devlst (/RAM).

L39FE  			sta devnum			 	preserve device to be checked next.
				stz loklst,x			mark this one as tested.
				jsr fnddvcb				find vcb that claims this dev (if any).
				bcs L3A29			  	branch if vcb full.
				ldx vcbptr			 	did fndvcb find it or return free vcb?
				lda vcbbuf,x
				beq L3A16				if free vcb.
				lda vcbbuf+17,x			is this volume active?
				bmi L39E2			  	if so, no need to re-log.

L3A16  			lda #$02			 	go read root dir into gbuf
				ldx #$00
				jsr rdblk
				bcs L39E2			  	ignore if unable to read.

				jsr logvcb				go log in volume name.
				bcs L39E2			  	look at next if non-xdos disk mounted.

				jsr XDOS.CheckVolName	is this the volume ?
				bcs L39E2			  	if not
L3A29  			rts
*--------------------------------------
mvdevnums 		ldx DEVCNT				copy all dev #'s to be checked.

L3A2D  			lda DEVLST,x		   	active device list.
				and #$F0			 	strip device type info.
				sta loklst,x			copy them to a temp workspace
				dex
				bpl L3A2D

				ldx DEVCNT
				rts
*--------------------------------------
fnddvcb			lda #$00				look for vcb with this device#
				ldy #$FF

L3A40  			tax						new index to next vcb
				lda vcbbuf+16,x			check all devnums
				cmp devnum				is this the vcb?
				bne L3A4E			  	if not
				stx vcbptr
				clc		 				indicates found
				rts

L3A4E  			lda vcbbuf,x			is this a free vcb?
				bne L3A57				if not

				iny
				stx vcbptr
L3A57  			txa
				clc						inc index to next vcb
				adc #$20
				bne L3A40

				tya		 				any free vcb's available?
				bpl L3A79			  	yes

				lda #$00			 	look for an entry to kick out

L3A62  			tax
				lda vcbbuf+17,x			any open files?
				bpl L3A70			  	no, kick this one out.
				txa		 				next vcb
				clc
				adc #$20			 	(vcb entry size)
				bne L3A62
				beq L3A7A			  	all vcb entries have open files

L3A70  			stx vcbptr			 	save entry index.
				stz vcbbuf,x			free this entry
				stz vcbbuf+16,x
L3A79  			clc		 				no error.

L3A7A  			lda #$55			 	# vcb full error
				rts
*--------------------------------------
XDOS.CheckVolName
				ldx #$00			 	index to directory name.
				ldy namptr			 	index to pathname.

				lda gbuf+4			 	get dir name length and type.
				cmp #$E0				is it a directory?
				bcc L3A90			  	if not.

				and #$0F			 	isolate name length and
				sta namcnt			 	save as a counter.
				bne L3A95			  	branch if valid length.

L3A90  			sec		 				indicate not found
				rts

L3A92  			.DO LOWERCASE=1
				lda gbuf+$20			VERSION
				bpl .8

				cpx #8
				bcs .1

				and whichbit,x
				beq .8
				bra .2
				
.1				lda gbuf+$21			MIN_VERSION			
				and whichbit-8,x
				beq .8
				
.2				lda gbuf+4,x
				jsr XDOS.ToLower
				bra L3A95
				
.8				.FIN
				lda gbuf+4,x			next char
				
L3A95  			cmp pathbuf,y
				bne L3A90			  	if not the same.

				inx		 				check next char
				iny
				dec namcnt
				bpl L3A92			  	if more to compare.

				clc		 				match found
XDOS.CheckVolName.RTS
				rts
*--------------------------------------
logvcb			ldx vcbptr			 	previously logged in volume?
				lda vcbbuf,x			(acc = 0?)
				beq logvcb1			  	no, go prepare vcb.

				jsr cmpvcb			 	does vcb match vol read?
				bcc XDOS.CheckVolName.RTS			  	yes, do not disturb.

logvcb1			ldy #$1F			 	zero out vcb entry

L3AB2  			stz vcbbuf,x
				inx
				dey
				bpl L3AB2
	
				jsr tstsos				make sure it's an xdos disk
				bcs XDOS.CheckVolName.RTS				if not, return carry set.

				jsr tstdupvol			does a duplicate with open files
				bcs L3B04			 	already exist? branch if yes.

				lda gbuf+4			 	move volume name to vcb.
				and #$0F			 	strip root marker
				tay
				pha
				ora vcbptr
				tax

L3ACE  			.DO LOWERCASE=1
				jsr XDOS.GetVolNameCharGBufY
				.ELSE
				lda gbuf+4,y
				.FIN
				sta vcbbuf,x
				dex
				dey
				bne L3ACE

				pla		 				get length again
				sta vcbbuf,x			and save.

				lda devnum			 	last device used.
				sta vcbbuf+16,x			save device # and
				lda gbuf+41				total # of blocks on this unit.
				sta vcbbuf+18,x
				lda gbuf+42
				sta vcbbuf+19,x
				lda bloknml				save address of root directory.
				sta vcbbuf+22,x
				lda bloknml+1
				sta vcbbuf+23,x
				lda gbuf+39				save address of the 1st bitmap.
				sta vcbbuf+26,x
				lda gbuf+40
				sta vcbbuf+27,x

L3B04  			clc		 				indicate logged if possible
				rts
*--------------------------------------
cmpvcb			lda gbuf+4			 	with name in directory.
				and #$0F
				cmp vcbbuf,x			are they the same length?
				stx xvcbptr				(see rev note #23)
				bne L3B1E			  	if not the same.

				tay
				ora xvcbptr
				tax

L3B18  			.DO LOWERCASE=1
				jsr XDOS.GetVolNameCharGBufY
				.ELSE
				lda gbuf+4,y
				.FIN

				cmp vcbbuf,x

L3B1E  			sec		 				anticipate different names.
				bne L3B26			  	if not the same.

				dex
				dey
				bne L3B18

				clc		 				indicate match.

L3B26  			ldx xvcbptr				offset to start of vcb (rev note #23)
				rts
*--------------------------------------
tstdupvol 		lda #$00			 	check for other logged in volumes with the same name.
L3B2C  			tax
				jsr cmpvcb
				bcs L3B41			  	if no match.
				lda vcbbuf+17,x			test for any open files.
				bmi L3B4B			  	cannot look at this volume.
				lda #$00			 	take duplicate offline if no open files
				sta vcbbuf,x
				sta vcbbuf+16,x
				beq L3B49			  	ok to log in new volume.
L3B41  			txa		 				index to next vcb
				clc
				and #$E0				strip odd stuff.
				adc #$20			 	inc to next entry.
				bcc L3B2C			  	branch if more to check
L3B49  			clc
				rts

L3B4B  			sta duplflag			duplicate has been found.
				stx vcbentry			save pointer to conflicting vcb.
				sec		 				error.
				rts
*--------------------------------------
tstfrblk 		ldx vcbptr			 	test if enough free blocks available for request.
				lda vcbbuf+21,x			check if proper count for this volume.
				ora vcbbuf+20,x
				bne L3BAD			  	branch if count is non-zero.

tkfrecnt 		jsr cntbms				get # of bitmaps
				sta bmcnt			  	and save.
				stz scrtch			 	start count at 0
				stz scrtch+1
				lda #$FF			 	mark 'first free' temp as unknown
				sta nofree
				jsr upbmap			 	update volume bitmap.
				bcs L3BC1			  	if error.
				ldx vcbptr			 	get address of 1st bitmap
				lda vcbbuf+26,x
				sta bloknml
				lda vcbbuf+27,x
				sta bloknml+1
L3B81  			jsr rdgbuf			 	use general buffer for temp space to
				bcs L3BC1			  	count free blocks (bits).
				jsr count
				dec bmcnt			  	was that the last bitmap?
				bmi L3B96			  	if so, go change fcb so not done again.
				inc bloknml
				bne L3B81
				inc bloknml+1
				bra L3B81
L3B96  			ldx vcbptr			 	mark which block had 1st free space
				lda nofree
				bmi L3BBE			 	if no free space was found.
				sta vcbbuf+28,x			update the free count.
				lda scrtch+1
				sta vcbbuf+21,x			update volume control byte.
				lda scrtch
				sta vcbbuf+20,x
L3BAD  			lda vcbbuf+20,x			compare total available free blocks
				sec		 				on this volume.
				sbc reql
				lda vcbbuf+21,x
				sbc reqh
				bcc L3BBE
				clc
				rts

L3BBE  			lda #MLI.E.VOLFULL
				sec
L3BC1  			rts

count			ldy #$00

L3BC4  			lda gbuf,y				bit pattern.
				beq L3BCC			  	don't count
				jsr cntfree
L3BCC  			lda gbuf+$100,y			do both pages with same loop
				beq L3BD4
				jsr cntfree
L3BD4  			iny
				bne L3BC4			  	loop until all 512 bytes counted.
				bit nofree			 	has 1st block w/free space been found?
				bpl L3BEE			  	if yes.
				lda scrtch			 	test to see if any blocks were counted
				ora scrtch+1
				beq L3BEE			  	branch if none counted.
				jsr cntbms			 	get total # of maps.
				sec		 				subtract countdown from total bitmaps
				sbc bmcnt
				sta nofree
L3BEE  			rts

cntfree			asl			  			count the # of bits in this byte
				bcc L3BFA
				inc scrtch
				bne L3BFA
				inc scrtch+1
L3BFA  			ora #$00
				bne cntfree				loop until all bits counted
				rts
cntbms			ldx vcbptr
				ldy vcbbuf+19,x			return the # of bitmaps
				lda vcbbuf+18,x			possible with the total count
				bne L3C0B			  	found in the vcb.
				dey						adj for bitmap block boundary
L3C0B  			tya
				lsr			  			divide by 16. the result is
				lsr			  			the # of bitmaps.
				lsr
				lsr
				rts
*--------------------------------------
MAN
SAVE USR/SRC/PRODOS.FX/PRODOS.S.XDOS.B
LOAD USR/SRC/PRODOS.FX/PRODOS.S
ASM