mirror of https://github.com/A2osX/A2osX.git
868 lines
27 KiB
Plaintext
868 lines
27 KiB
Plaintext
NEW
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AUTO 3,1
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* create file
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create jsr lookfile check for duplicate, get free entry
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bcs tstfnf error code may be 'file not found'
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lda #$47 name already exists
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crerr1 sec
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rts
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tstfnf cmp #$46 'file not found' is ok
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bne crerr1 otherwise exit with error.
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ldy #$07 test for tree or directory file,
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lda (A3L),y no other kinds are legal.
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cmp #$04 is it seed, sapling or tree?
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bcc tstdspc branch if it is
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cmp #$0D
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bne ctyperr report type error if not directory.
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tstdspc lda devnum make sure destination device
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jsr twrprot1 is not write protected.
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bcs H351D
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lda nofree is there space in directory to
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beq xtndir add this file? branch if not
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jmp creat1 otherwise, go create file.
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ctyperr lda #$4B filetype error
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sec
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H351D rts
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xtndir lda own_blk before extending directory,
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ora own_blk+1 make sure it's a subdirectory.
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bne H352A
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lda #$49 otherwise, directory full error
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sec
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rts
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H352A lda bloknml preserve disk address of current (last)
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pha directory link, before allocating an
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lda bloknml+1 extended block.
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pha
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jsr alc1blk allocate a block for extending directory
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plx
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stx bloknml+1 restore block addr of dir info in gbuf
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plx
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stx bloknml
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bcs H351D unable to allocate.
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sta gbuf+2 save block address in y,a to
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sty gbuf+3 current directory.
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jsr wrtgbuf update directory block with new link.
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bcs H351D if error
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ldx #$01
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swpbloks lda bloknml,x prepare new directory block
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sta gbuf,x using current block as back link
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lda gbuf+2,x
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sta bloknml,x and save new block as next to be written
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dex
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bpl swpbloks
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inx
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txa x and a = 0
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clrdir sta gbuf+2,x
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sta gbuf+$100,x
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inx
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bne clrdir
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jsr wrtgbuf write prepared directory extension.
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bcs H351D if error
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lda own_blk
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ldx own_blk+1
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jsr rdblk read in parent directory block
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ldx own_ent and calc entry address.
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lda /gbuf
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sta zpt+1
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lda #$04
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ocalc clc
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dex has entry address been calulated?
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beq H3584 if yes.
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adc own_len next entry address
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bcc ocalc
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inc zpt+1 entry must be in 2nd 256 bytes of block
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bcs ocalc always taken.
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H3584 sta zpt
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ldy #$13 index to block count
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H3588 lda (zpt),y
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adc dinctbl-$13,y add 1 to block count and
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sta (zpt),y
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iny
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tya $200 to the directory's eof.
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eor #$18 done with usage/eof update?
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bne H3588 branch if not.
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jsr wrtgbuf go update parent.
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bcs crerr2
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jmp create
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crerr2 rts return and report errors
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creat1 ldx #$00 zero out gbuf
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H35A0 stz gbuf,x
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stz gbuf+$100,x and data block of file.
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inx
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bne H35A0
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ldy #$0B move user specified date/time
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cmvtime lda (A3L),y to directory.
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sta d_filid,y
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txa if all 4 bytes of date/time = 0
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ora (A3L),y then use built-in date/time.
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tax
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dey
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cpy #$07
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bne cmvtime
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txa does user want default time?
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bne cmvname if not.
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ldx #$03
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mvdftime lda p8date,x move current default date/time
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sta d_credt,x
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dex
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bpl mvdftime
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cmvname lda (A3L),y y = index to file kind.
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cmp #$04
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lda #$10 assume tree type
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bcc csvfkind
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lda #$D0 it's directory.
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csvfkind ldx namptr index to local name of pathname.
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ora pathbuf,x combine file kind with name length.
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sta d_stor sos calls this 'storage type'.
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and #$0F strip back to name length
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tay and use as counter for move.
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clc
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adc namptr calc end of name
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tax
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crname lda pathbuf,x move local name as filename
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sta d_stor,y
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dex
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dey
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bne crname
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ldy #$03 index to 'access' parameter
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lda (A3L),y
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sta d_attr
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iny also move 'file identification'
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lda (A3L),y
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sta d_filid
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cmvauxid iny move auxillary identification bytes
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lda (A3L),y
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sta d_auxid-5,y
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cpy #$06
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bne cmvauxid
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lda xdosver save current xdos version #
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sta d_sosver
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lda compat and backward compatibility #
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sta d_comp
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lda #$01 usage is always 1 block
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sta d_usage
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lda d_head place back pointer to header block
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sta d_dhdr
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lda d_head+1
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sta d_dhdr+1
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lda d_stor storage type.
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and #$E0 is it a directory?
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beq cralcblk branch if seed file.
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ldx #$1E move header to data block
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cmvheadr lda d_stor,x
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sta gbuf+4,x
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dex
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bpl cmvheadr
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eor #$30
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sta gbuf+4 make it a directory header mark.
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ldx #$07 overwrite password area and other
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cmvpass lda pass,x header info.
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sta gbuf+20,x
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lda xdosver,x
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sta gbuf+32,x
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dex
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bpl cmvpass
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ldx #$02 and include info about parent directory
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stx d_eof+1
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cmvparnt lda d_entblk,x
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sta gbuf+39,x
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dex
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bpl cmvparnt
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lda h_entln lastly, the length of parent's
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sta gbuf+42 directory entries.
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cralcblk jsr alc1blk get address of file's data block
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bcs crerr3
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sta d_frst
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sty d_frst+1
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sta bloknml
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sty bloknml+1
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jsr wrtgbuf go write data block of file
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bcs crerr3
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inc h_fcnt add 1 to total # of files in this dir
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bne credone
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inc h_fcnt+1
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credone jsr drevise go revise directories with new file
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bcs crerr3
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jmp upbmap lastly, update volume bitmap
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entcalc lda /gbuf set high address of dir entry
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sta zpt+1 index pointer.
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lda #$04 calc address of entry based
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ldx d_entnum on the entry #.
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H3689 clc
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H368A dex addr = gbuf + ((d_entnum-1) * h_entln)
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beq H3696 branch with carry clear = no errors.
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adc h_entln
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bcc H368A
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inc zpt+1 inc hi address.
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bcs H3689 always.
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H3696 sta zpt newly calculated low address.
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crerr3 rts carry set if error.
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drevise lda p8date
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beq drevise1 if no clock, then don't mod date/time.
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ldx #$03
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modtime lda p8date,x move last modification date/time
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sta d_moddt,x to entry being updated.
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dex
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bpl modtime
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drevise1 lda d_attr mark entry as backupable
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ora bkbitflg (bit 5 = backup needed)
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sta d_attr
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lda d_dev get device # of directory
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sta devnum to be revised
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lda d_entblk and address of direcotry block.
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ldx d_entblk+1
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jsr rdblk read block into general purpose buffer
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bcs crerr3
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jsr entcalc fix up ptr to entry location within gbuf.
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ldy h_entln now move 'd.' info to directory.
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dey
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H36CA lda d_stor,y
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sta (zpt),y
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dey
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bpl H36CA
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lda d_head is the entry block same as
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cmp bloknml the entry's header block?
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bne H36E0 if no, go save entry block
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lda d_head+1 then maybe, so test high addresses.
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cmp bloknml+1
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beq uphead branch if they are the same block.
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H36E0 jsr wrtgbuf go write updated directory block.
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bcs crerr3
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lda d_head get address of header block and
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ldx d_head+1
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jsr rdblk go read in header block to modify.
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bcs crerr3
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uphead ldy #$01 update current # of files in this dir.
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H36F2 lda h_fcnt,y
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sta gbuf+37,y (current entry count)
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dey
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bpl H36F2
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lda h_attr also update header's attributes.
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sta gbuf+34
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jsr wrtgbuf go write updated header
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bcs H375A
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ripple lda gbuf+4 test for 'root' directory because
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and #$F0 if it is, then directory revision
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eor #$F0 is complete (leaves carry clear).
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beq H3770 branch if done.
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lda gbuf+41 get entry #
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sta d_entnum
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lda gbuf+42 and the length of ertries in that dir
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sta h_entln
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lda gbuf+39 get addr of parent entry's dir block
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ldx gbuf+40
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jsr rdblk read it
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bcs H375A
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jsr entcalc get indirect ptr to parent entry in gbuf
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lda p8date don't touch mod
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beq H373B if no clock...
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ldx #$03 update the modification date & time
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ldy #$24 for this entry too
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H3732 lda p8date,x
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sta (zpt),y
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dey
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dex
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bpl H3732
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H373B jsr wrtgbuf write updated entry back to disk.
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bcs H375A if error.
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ldy #$25 compare current block # to this
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lda (zpt),y entry's header block.
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iny
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cmp bloknml are low addresses the same?
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sta bloknml
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bne H3751 branch if entry doesn't reside in same
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lda (zpt),y block as header.
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cmp bloknml+1 are high address the same?
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beq ripple they are the same, continue to root dir.
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H3751 lda (zpt),y not same so read in this dir's header.
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sta bloknml+1
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jsr rdgbuf
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bcc ripple continue if read was good
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H375A rts
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tsterr lda #$52 not tree or dir, unrecognized type
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sec
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rts
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tstsos lda gbuf pointer to previous dir block
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ora gbuf+1 must be null
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bne tsterr
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lda gbuf+4 test for header
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and #$E0
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cmp #$E0
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bne tsterr
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H3770 clc no error
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rts
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findfile jsr lookfile see if file exists
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bcs nofind
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moventry ldy h_entln
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H377A lda (zpt),y move entry into storage
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sta d_stor,y
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dey
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bpl H377A
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lda #$00 no errors
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nofind rts
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lookfile jsr preproot go find volume
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bcs fnderr
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bne lookfil0 branch if more than root
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lda /gbuf otherwise, report a bad path error
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sta zpt+1 (but 1st create a phantom entry
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lda #$04 for open)
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sta zpt
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ldy #$1F move in id and date info
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phantm1 lda (zpt),y
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sta d_stor,y
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dey
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cpy #$17
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bne phantm1
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phantm2 lda rootstuf-$10,y
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sta d_stor,y
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dey
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cpy #$0F
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bne phantm2
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lda #$D0 fake directory file
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sta d_stor
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lda gbuf+2 check forward link.
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ora gbuf+3 if non-zero, assume full sized directory
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bne H37C2 else assume it's the slot 3 /RAM volume
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lda #$02 so reset eof and blocks_used fields
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sta d_eof+1
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lda #$01
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sta d_usage
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H37C2 lda #$40 bad path (carry set)
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rts
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lookfil0 stz nofree reset free entry indicator.
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sec dir to be searched has header in this block.
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L37C9 stz totent reset entry counter.
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jsr looknam look for name pointed to by pnptr.
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bcc namfound if name was found.
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lda entcntl have we looked at all of the
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sbc totent entries in this directory?
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bcc L37E2 maybe, check hi count.
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bne L37EB no, read next directory block.
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cmp entcnth has the last entry been looked at?
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beq errfnf yes, give 'file not found' error
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bne L37EB or branch always.
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L37E2 dec entcnth should be at least one
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bpl L37EB so this should be branch always...
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errdir lda #$51 directory error
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fnderr sec
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rts
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L37EB sta entcntl keep a running count.
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lda /gbuf reset indirect pointer
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sta zpt+1
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lda gbuf+2 get link to next dir block
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bne L37FC (if there is one).
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cmp gbuf+3 are both zero, i.e. no link? if so,
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beq errdir then not all entries were acct'd for.
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L37FC ldx gbuf+3 acc has value for block# (low).
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jsr rdblk go read the next linked directory.
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bcc L37C9 if no error.
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rts return error in acc.
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errfnf lda nofree was any free entry found?
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bne fnf0
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lda gbuf+2 test link
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bne L3814
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cmp gbuf+3 if both are 0 then give up.
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beq fnf0 report 'not found'.
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L3814 sta d_entblk
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lda gbuf+3
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sta d_entblk+1 assume 1st entry of next block
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lda #$01 is free for use.
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sta d_entnum mark as valid (for create)
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sta nofree
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fnf0 jsr nxtpnam1 'file not found' or 'path not found'?
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errpath1 sec if non-zero then 'path not found'
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beq fnf1
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lda #$44 path not found
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rts
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fnf1 lda #$46 file not found
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rts
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namfound jsr nxtpname adj index to next name in path.
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beq filfound branch if that was the last name.
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ldy #$00 be sure this is a directory entry.
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lda (zpt),y high nibble will tell.
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and #$F0
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cmp #$D0 is it a subdirectory?
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bne errpath1 error if not.
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ldy #$11 get address of 1st subdirectory block
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lda (zpt),y
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sta bloknml (no checking done for a valid block#)
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iny
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sta d_head save as file's header block too
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lda (zpt),y
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sta bloknml+1
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sta d_head+1
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jsr rdgbuf read subdirectory into gbuf.
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bcs fnderr1 if error.
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lda gbuf+37 get the # of files contained in this
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sta entcntl directory.
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lda gbuf+38
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sta entcnth
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lda gbuf+20 make sure password is disabled
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ldx #$00
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sec
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rol
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L3869 bcc L386C
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inx
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L386C asl
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bne L3869
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cpx #$05 is password disabled?
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beq movhead
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lda #$4A directory is not compatible
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fnderr1 sec
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rts
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movhead jsr movhed0 move directory info.
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jmp lookfil0 do next local pathname.
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movhed0 ldx #$0A move this directory info
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L387F lda gbuf+28,x
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sta h_credt,x
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dex
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bpl L387F
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lda gbuf+4 if this is root, then nothing to do
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and #$F0
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eor #$F0 test header type.
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beq L389C branch if root
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ldx #$03 otherwise, save owner info about
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L3893 lda gbuf+39,x this header.
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sta own_blk,x
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dex
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bpl L3893
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L389C rts
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entadr .EQ *
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filfound lda h_maxent figure out which entry # this is
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sec
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sbc cntent max entries - count entries + 1
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adc #$00 = entry # (carry was set)
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sta d_entnum
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lda bloknml and indicate block # of this directory
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sta d_entblk
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lda bloknml+1
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sta d_entblk+1
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clc
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rts
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looknam lda h_maxent reset count of files per block
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sta cntent
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lda /gbuf
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sta zpt+1
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lda #$04
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L38C1 sta zpt reset indirect pointer to gbuf
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bcs L38F8 branch if this block contains a header
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ldy #$00
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lda (zpt),y get length of name in directory.
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bne isname branch if there is a name.
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lda nofree test if a free entry has been declared.
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bne L38F8 yes, inc to next entry.
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jsr entadr set address for current entry.
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inc nofree indicate a free spot has been found.
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bne L38F8 always.
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isname and #$0F strip byte (is checked by 'filfound')
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inc totent inc count of valid files found.
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sta namcnt save name length as counter.
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ldx namptr get index to current path.
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cmp pathbuf,x are both names the same length?
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bne L38F8 no, inc to next entry.
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cmpname inx (first) next letter index
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iny
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lda (zpt),y compare names letter by letter
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cmp pathbuf,x
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bne L38F8
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dec namcnt all letters compared?
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bne cmpname no, continue.
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clc a match is found.
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noname rts
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L38F8 dec cntent checked all entries in this block?
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sec
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beq noname yes, no name match.
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lda h_entln add entry length to current pointer
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clc
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adc zpt
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bcc L38C1 branch if still in 1st page.
|
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inc zpt+1 look on 2nd page.
|
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clc carry should always be clear before
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bcc L38C1 looking at next.
|
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|
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preproot jsr findvol search vcb's and dev's for spec'd volume
|
||
bcs novolume
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lda #$00 zero out directory temps
|
||
ldy #$42
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L3914 sta own_blk,y and owner info
|
||
dey
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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 cmppnam 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 numdevs 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 #$45 no mounted volume
|
||
sec error
|
||
L39F0 rts
|
||
L39F1 ldx numdevs 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 #$00
|
||
jsr rdblk
|
||
bcs L39E2 ignore if unable to read.
|
||
jsr logvcb go log in volume name.
|
||
bcs L39E2 look at next if non-xdos disk mounted.
|
||
jsr cmppnam is this the volume ?
|
||
bcs L39E2 if not
|
||
L3A29 rts
|
||
mvdevnums ldx numdevs copy all dev #'s to be checked.
|
||
L3A2D lda devlist,x active device list.
|
||
and #$F0 strip device type info.
|
||
sta loklst,x copy them to a temp workspace
|
||
dex
|
||
bpl L3A2D
|
||
ldx numdevs
|
||
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
|
||
|
||
cmppnam 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 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
|
||
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 L3B05 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 L3B05 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 lda gbuf+4,y
|
||
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
|
||
L3B05 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 lda gbuf+4,y
|
||
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 #$48 disk full
|
||
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.203/prodos.s.xdos.b
|
||
LOAD usr/src/prodos.203/prodos.s
|
||
ASM
|