NEW AUTO 3,1 object code = mli_2 * xdos mli system call processor ofsX .EQ xdosobj-xdosorg offset to xdos org xdosmli .EQ *-ofsX xdos MLI in aux ram xdosobj cld no decimal. pla get processor status sta spare1 save it temporarily sty mliy save x and y stx mlix pla find out the address of the caller sta A3L clc preserve the address of the call spec. adc #$04 sta mliretn last MLI call return address pla sta A3L+1 adc #$00 sta mliretn+1 lda spare1 pha pull processor status plp to re-enable interrupts. cld still no decimal ldy #$00 sty p8error clear any previous errors. iny find out if command is valid. lda (A3L),y get command # lsr a and hash it to a range of 0-$1F lsr a lsr a lsr a clc adc (A3L),y and #$1F tax lda (A3L),y check result to see if valid command # cmp scnums,x bne scnerr iny index to call spec parm list. lda (A3L),y make A3L point to parameter count byte pha in parameter block. iny lda (A3L),y sta A3L+1 pla sta A3L ldy #$00 make sure parameter list has the lda pcntbl,x correct # of parameters. beq goclock clock has 0 parameters. cmp (A3L),y bne scperr error if wrong count. lda scnums,x get call # again cmp #$65 is it quit? beq special if so, then call quit dispatcher asl a carry set if bfm or dev mgr bpl godevmgr bcs gobfmgr lsr a shift back down for interrupt manager and #$03 valid calls are 0 and 1 jsr intmgr bra exitmli special jmp jspare P8 system death vector goclock jsr clockv go read clock. bra exitmli no errors possible godevmgr lsr a shift back down for device manager. adc #$01 valid commands are 1 and 2. sta A4L save command #. jsr devmgr execute read or write request. bra exitmli gobfmgr lsr a shift back down for block file manager. and #$1F valid commands are 0-$13 tax jsr bfmgr exitmli stz bubit clear backup bit ldy p8error P8 error code cpy #$01 if > 0 then set carry tya and set z flag. php disable interrupts until exit complete. sei lsr mliact indicate MLI done. plx save status register until return. lda mliretn+1 place last MLI call return address pha on stack. return is done via 'rti' lda mliretn so the status register is restored pha at the same time, so phx place status back on stack tya return error, if any. ldx mlix MLI X register savearea ldy mliy MLI Y register savearea pha lda bnkbyt1 restore language card status jmp HBFA0 and return. nodevice .EQ *-ofsX lda #$28 no device connected. jsr p8errv P8 error vector. scnerr lda #$01 no such command. bne H30B0 scperr lda #$04 parameter count is invalid H30B0 jsr gosyserr bcs exitmli always taken * ProDOS Device Manager devmgr .EQ *-ofsX ldy #$05 php do not allow interrupts. sei the call spec for devices must H30B9 lda (A3L),y be passed to drivers in page zero: sta |A4L,y sta $0042,y dey bne H30B9 ldx buf+1 buffer page stx usrbuf+1 to user buffer inx inx lda buf is buffer page aligned (nn00) ? beq H30CC branch if it is inx else account for 3-page straddle H30CC jsr vldbuf1 make sure user buffer is not bcs dvmgrerr conflicting with protected ram. jsr dmgr call internal entry for device dispatch bcs dvmgrerr branch if error plp clc no error rts dvmgrerr plp restore interrupt status gosyserr .EQ *-ofsX jsr p8errv P8 error vector dmgr .EQ *-ofsX interrupts must always be off. lda unitnum get device # and and #$F0 strip misc lower nibble sta unitnum then save it. lsr a use as index to device table lsr a lsr a tax lda drivertbl1,x fetch driver address sta goadr lda drivertbl1+1,x sta goadr+1 gocmd .EQ *-ofsX jmp (goadr) goto driver (or error if no driver) * ProDOS interrupt manager intmgr .EQ *-ofsX sta A4L interrupt command lsr a allocate interrupt or deallocate? bcs dealcint branch if deallocate. ldx #$03 test for a free interrupt space in tbl. alcint lda inttbl-2,x test high address for 0. bne H3118 branch if spot occupied. ldy #$03 get address of routine. lda (A3L),y must not be zero page. beq badint error if it is. sta inttbl-2,x save high address dey lda (A3L),y sta inttbl-3,x and low address. txa return interrupt # in range 1-4 lsr a dey sta (A3L),y pass back to user. clc no errors. rts H3118 inx inx next lower priority spot cpx #$0B are all 4 already allocated? bne alcint branch if not. lda #$25 interrupt table full bne H3124 badint lda #$53 invalid parameter. H3124 jsr p8errv P8 error vector. dealcint ldy #$01 zero out interrupt vector lda (A3L),y but make sure it is a valid #. beq badint error if < 1 cmp #$05 or > 4 bcs badint asl a tax lda #$00 now clear it sta inttbl-2,x sta inttbl-1,x clc rts irqrecev .EQ *-ofsX lda accsav get acc from where old ROM put it. sta p8areg stx p8xreg entry point on ram card interrupt sty p8yreg tsx stx p8sreg lda irqflag irq flag = 0 if old roms bne H315D and 1 if new roms. pla restore return address and p-reg. sta p8preg pla sta intadr interrupt return address pla sta intadr+1 H315D txs lda mslot set up to re-enable $Cn00 rom sta irqdev+2 tsx make sure stack has room for 16 bytes. bmi H3170 branch if stack ok ldy #$0F otherwise, make room and save it. H3169 pla sta svstack,y dey bpl H3169 H3170 ldx #$FA save 6 bytes of page 0 H3172 lda $00,x sta svzerop-$FA,x inx bne H3172 * poll interrupt routines for a claimer lda inttbl+1 test for a valid routine. beq intr2 branch if no routine. jsr goint1 execute bcc irqdone intr2 lda inttbl+3 repeat 3 more times beq intr3 jsr goint2 bcc irqdone intr3 lda inttbl+5 beq intr4 jsr goint3 bcc irqdone intr4 lda inttbl+7 beq H31A2 jsr goint4 bcc irqdone H31A2 inc irqcount allow 255 unclaimed interrupts bne irqdone before system death. lda #$01 bad irq so jsr sysdeath kill the system. irqdone ldx #$FA H31AE lda svzerop-$FA,x restore the zero page sta $00,x inx bne H31AE ldx p8sreg test if stack needs restoring. bmi H31C6 branch if not. ldy #$00 H31BD lda svstack,y restore stack pha iny cpy #$10 bne H31BD H31C6 lda irqflag check for old roms. bne H31DD branch if new roms. ldy p8yreg restore registers. ldx p8xreg lda clrrom re-enable i/o card. irqdev .EQ *-ofsX lda $C100 Cn is self modifying. lda irqdev+2 restore device id. sta mslot slot being accessed. H31DD jmp irqexit do necessary bank switches and return. irqflag .EQ *-ofsX .DA #00' 0 = old roms. 1 = new roms. irqcount .EQ *-ofsX dc h'00' # of unclaimed interrupts. svstack .EQ *-ofsX temporary save area from stack dc h'0000000000000000' .DA #0000000000000000' svzerop .EQ *-ofsX temporary save area for zero page .DA #000000000000' goint1 .EQ *-ofsX jmp (inttbl) interrupt routine 1 goint2 .EQ *-ofsX jmp (inttbl+2) interrupt routine 2 goint3 .EQ *-ofsX jmp (inttbl+4) interrupt routine 3 goint4 .EQ *-ofsX jmp (inttbl+6) interrupt routine 4 syserr1 .EQ *-ofsX sta p8error P8 error code plx plx pop 1 level of return sec rts sysdeath1 .EQ *-ofsX tax death error code. sta clr80vid disable 80 col hardware. lda txtset switch in text. lda cortflag is this a Cortland? beq H321A if not, don't use super hires switch. stz newvideo force off super hires. H321A lda txtpage1 switch in text page 1. ldy #$13 H321F lda #$20 inverse space border sta vline11+10,y sta vline13+10,y lda deathmsg,y sta vline12+10,y 'RESTART SYSTEM-$0x' dey bpl H321F txa x = death error code and #$0F convert to ascii ora #$B0 cmp #$BA bcc H323B branch if not > 9. adc #$06 inc to alpha a-f H323B sta vline12+28 death error code 1 to F H323E bra H323E end of xdos mli * ProDOS Block File Manager bfmgr .EQ *-ofsX lda disptch,x translate into command address. asl a bit 7 indicates pathname to process sta cmdtemp and #$3F bit 6 is refnum, 5 is time to process tax lda cmdtable,x move address to indirect jump sta goadr lda cmdtable+1,x high byte sta goadr+1 lda #$20 init backup bit flag sta bkbitflg to say 'file modified' bcc nopath jsr setpath process pathname before calling command bcs errorsys branch if bad name. nopath asl cmdtemp test for refnum processing bcc nopreref jsr findfcb set pointers to fcb and vcb of file bcs errorsys nopreref asl cmdtemp check for necessity of time stamp bcc H3274 jsr clockv date/time H3274 jsr gocmd execute command bcc goodop errorsys jsr p8errv P8 error vector goodop rts setpath .EQ *-ofsX ldy #$01 index to pathname pointer lda (A3L),y low pointer address sta zpt iny lda (A3L),y hi pointer address sta zpt+1 synpath .EQ *-ofsX entry used by rename for 2nd pathname. ldx #$00 x = index to pathbuf ldy #$00 y = index to input pathname. stx prfxflg assume prefix is in use. stx pathbuf mark pathbuf = nothing processed. lda (zpt),y validate pathname length > 0 and < 65 beq errsyn cmp #$41 bcs errsyn sta pathcnt this is used to compare for inc pathcnt end of pathname processing. iny now check for full pathname... lda (zpt),y (full name if starts with '/') ora #$80 cmp #$AF bne H32AD branch if prefix appended. sta prfxflg set prefix flag = prefix not used. iny index to 1st character of pathname. H32AD lda #$FF set current position of pathbuf sta pathbuf,x to indicate end of pathname. sta namcnt $FF = no chars processed in local name. stx namptr pointer to local name length byte. H32B8 cpy pathcnt done with pathname processing? bcs endpath lda (zpt),y get character and #$7F inx prepare for next char iny cmp #$2F is it delimiter '/' ? beq endname yes cmp #$61 lowercase? bcc H32CD no and #$5F shift to uppercase H32CD sta pathbuf,x store char inc namcnt is it the 1st char of a local name? bne H32DA no inc namcnt increment to 1 bne H32E6 1st char must be alpha (always taken) H32DA cmp #$2E is it '.' ? beq H32B8 ok, then do next char cmp #$30 at least a '0' ? bcc errsyn error if not cmp #$3A is it numeric? bcc H32B8 yes, get next char H32E6 cmp #$41 at least an 'a' ? bcc errsyn error if not cmp #$5B is it > 'z' ? bcc H32B8 branch if valid alpha to get next char errsyn sec bad pathname lda #$40 rts endpath lda #$00 end pathname with a 0 bit namcnt also make sure count is positive bpl H32FD sta namcnt dex H32FD inx sta pathbuf,x beq errsyn error if '/' only. stx pathcnt save length of pathname tax endname lda namcnt validate local name < 16 cmp #$10 bcs errsyn phx save pointer ldx namptr get index to beginning of local name sta pathbuf,x save local name's length plx restore pointer bne H32AD branch if more names to process clc probably no error, but lda prfxflg make sure all pathnames are prefixed bne H3323 or begin with a '/'. lda newpfxptr must be non-zero beq errsyn H3323 rts * set prefix command setprefx .EQ *-ofsX jsr setpath call is made to detect if a null path. bcc H3333 path ok. ldy pathbuf is it a null pathname? bne pfxerr error if not jsr stypfx indicate null prefix clc no error rts H3333 jsr findfile go find specified prefix directory. bcc H333C if no error. cmp #$40 bad pathname. bne pfxerr branch if error is not root directory. H333C lda d_stor make sure last local name is dir type and #$D0 (either root or sub). eor #$D0 directory? bne ptyperr wrong type ldy prfxflg new or appended prefix? bne H334D lda newpfxptr append new prefix to old H334D tay sec find new beginning of prefix sbc pathcnt cmp #$C0 too long? bcc errsyn then error tax jsr stapfx lda d_dev save device # sta p_dev lda d_frst and address of 1st block sta p_blok lda d_frst+1 sta p_blok+1 movprfx lda pathbuf,y sta pathbuf,x iny inx bne movprfx clc good prefix rts ptyperr lda #$4B filetype error (not a directory) pfxerr sec rts * get prefix command getprefx .EQ *-ofsX calc how big a buffer is needed. clc get index to users pathname buffer ldy #$01 lda (A3L),y sta usrbuf user buffer ptr iny lda (A3L),y sta usrbuf+1 stz cbytes+1 set buffer length at 64 char max lda #$40 sta cbytes jsr valdbuf go validate prefix buffer address bcs pfxerr ldy #$00 y = indirect index to user buffer. lda newpfxptr get address of beginning of prefix tax beq nulprfx if null prefix. eor #$FF get total length of prefix adc #$02 add 2 for leading and trailing slashes. nulprfx sta (usrbuf),y store length in user's buffer. beq gotprfx branch if null prefix. sendprfx iny inc to next user buffer location. lda pathbuf,x get next char of prefix. sndlimit sta (usrbuf),y give char to user. and #$F0 check for length descriptor. bne H33B3 branch if regular character lda #$2F otherwise, substitute a slash. bne sndlimit branch always H33B3 inx bne sendprfx branch if more to send. iny lda #$2F end with '/' sta (usrbuf),y gotprfx clc no error rts findfcb .EQ *-ofsX ldy #$01 index to ref# lda (A3L),y is it a valid file# ? beq badref must not be 0. cmp #$09 must be 1 to 8 only. bcs badref pha dec a lsr a ror a ror a ror a multiply by 32. sta fcbptr used as an index to fcb tay pla restore ref# in acc cmp fcbbuf,y bne errnoref fndfcbuf .EQ *-ofsX get page address of file buffer. lda fcbbuf+11,y jsr getbufadr get file's address into bufaddrl,h ldx bufaddrh (y=fcbptr preserved) beq fcbdead fcb corrupted stx datptr+1 save ptr to data area of buffer inx inx index block always 2 pages after data stx zpt+1 lda fcbbuf+1,y also set up device # sta devnum lda bufaddrl sta datptr index and data buffers always on sta zpt page boundaries. fndfvol tax search for associated vcb lda vcbbuf+16,x cmp fcbbuf+1,y is this vcb the same device? beq tstvopen if it is, make sure volume is active. nxtfvol txa adjust index to next vcb. clc adc #$20 bcc fndfvol loop until volume found. lda #$0A open file has no volume so jsr sysdeath kill the system. fcbdead lda #$0B fcb error so jsr sysdeath kill the system. tstvopen lda vcbbuf,x make sure this vcb is open. beq nxtfvol branch if it is not active. stx vcbptr save ptr to good vcb. clc no error rts errnoref lda #$00 put a zero into this fcb to sta fcbbuf,y show free fcb. badref lda #$43 requested refnum is sec illegal (out of range) rts * online command online .EQ *-ofsX move user spec'd buffer ptr to usrbuf. jsr mvdbufr figure out how big buffer has to be. stz cbytes set this for valdbuf routine. stz cbytes+1 ldy #$01 lda (A3L),y if 0 then cbytes=$100 else $010 for one and #$F0 device. mask out unused nibble. sta devnum last device used. beq H343C branch if all devices. lda #$10 cbytes = $010 sta cbytes bne H343F always taken H343C inc cbytes+1 cbytes = $100 H343F jsr valdbuf go validate buffer range against bcs onlinerr allocated memory. lda #$00 zero out user buffer space ldy cbytes H3449 dey sta (usrbuf),y bne H3449 sta namptr used as pointer to user buffer. lda devnum get device # again. bne H3474 branch if only 1 device to process. jsr mvdevnums get list of currently recognized dev's. H3459 phx save index to last item on list lda loklst,x sta devnum save desired device to look at. jsr online1 log this volume and return it's name. lda namptr inc pointer for next device clc adc #$10 sta namptr plx get index to device list. dex next device. bpl H3459 branch if there is another device. lda #$00 no errors for multiple on-line clc onlinerr rts online1 .EQ *-ofsX H3474 jsr fnddvcb see if it has already been logged in. bcs olinerr1 branch if vcb is full. ldx #$00 read in root (volume) directory lda #$02 jsr rdblk read it into general purpose buffer. ldx vcbptr index to the vcb entry. bcc volfound branch if read was ok. tay error value. lda vcbbuf+17,x don't take the vcb offline if bne rtrnerr there are active files present. sta vcbbuf,x now take the volume offline sta vcbbuf+16,x rtrnerr tya error value. bcs olinerr1 branch if unable to read. volfound lda vcbbuf,x has it been logged in before? beq H349E if not. lda vcbbuf+17,x it has, are there active files? bmi H34AA branch if volume is currently busy. H349E jsr logvcb1 go log it in. bcs olinerr1 branch if there is a problem. lda #$57 anticipate a duplicate active volume bit duplflag exits. bmi olinerr1 branch if so. H34AA ldx vcbptr jsr cmpvcb does vol read compare with logged vol? lda #$2E anticipate wrong volume mounted. bcc H34D0 branch if ok. olinerr1 pha save error code. jsr svdevn report what device has problem. pla error code. iny tell what error was encountered. sta (usrbuf),y cmp #$57 duplicate volume error? bne H34CE no. iny report which other device has same name ldx vcbentry lda vcbbuf+16,x sta (usrbuf),y stz duplflag clear duplicate flag. lda #$57 duplicate volume error code. H34CE sec flag error rts H34D0 lda vcbbuf,x get volume name count sta namcnt ldy namptr index to user's buffer. H34D9 lda vcbbuf,x move name to user's buffer sta (usrbuf),y inx iny dec namcnt bpl H34D9 svdevn .EQ *-ofsX ldy namptr index to 1st byte of this entry. lda devnum upper nibble = device# and ora (usrbuf),y lower nibble = name length. sta (usrbuf),y clc no errors rts end of block file manager * create file create .EQ *-ofsX jsr lookfile check for duplicate, get free entry bcs tstfnf error code may be 'file not found' lda #$47 name already exists crerr1 sec rts tstfnf cmp #$46 'file not found' is ok bne crerr1 otherwise exit with error. ldy #$07 test for tree or directory file, lda (A3L),y no other kinds are legal. cmp #$04 is it seed, sapling or tree? bcc tstdspc branch if it is cmp #$0D bne ctyperr report type error if not directory. tstdspc lda devnum make sure destination device jsr twrprot1 is not write protected. bcs H351D lda nofree is there space in directory to beq xtndir add this file? branch if not jmp creat1 otherwise, go create file. ctyperr lda #$4B filetype error sec H351D rts xtndir lda own_blk before extending directory, ora own_blk+1 make sure it's a subdirectory. bne H352A lda #$49 otherwise, directory full error sec rts H352A lda bloknml preserve disk address of current (last) pha directory link, before allocating an lda bloknml+1 extended block. pha jsr alc1blk allocate a block for extending directory plx stx bloknml+1 restore block addr of dir info in gbuf plx stx bloknml bcs H351D unable to allocate. sta gbuf+2 save block address in y,a to sty gbuf+3 current directory. jsr wrtgbuf update directory block with new link. bcs H351D if error ldx #$01 swpbloks lda bloknml,x prepare new directory block sta gbuf,x using current block as back link lda gbuf+2,x sta bloknml,x and save new block as next to be written dex bpl swpbloks inx txa x and a = 0 clrdir sta gbuf+2,x sta gbuf+$100,x inx bne clrdir jsr wrtgbuf write prepared directory extension. bcs H351D if error lda own_blk ldx own_blk+1 jsr rdblk read in parent directory block ldx own_ent and calc entry address. lda #>gbuf sta zpt+1 lda #$04 ocalc clc dex has entry address been calulated? beq H3584 if yes. adc own_len next entry address bcc ocalc inc zpt+1 entry must be in 2nd 256 bytes of block bcs ocalc always taken. H3584 sta zpt ldy #$13 index to block count H3588 lda (zpt),y adc dinctbl-$13,y add 1 to block count and sta (zpt),y iny tya $200 to the directory's eof. eor #$18 done with usage/eof update? bne H3588 branch if not. jsr wrtgbuf go update parent. bcs crerr2 jmp create crerr2 rts return and report errors creat1 .EQ *-ofsX ldx #$00 zero out gbuf H35A0 stz gbuf,x stz gbuf+$100,x and data block of file. inx bne H35A0 ldy #$0B move user specified date/time cmvtime lda (A3L),y to directory. sta d_filid,y txa if all 4 bytes of date/time = 0 ora (A3L),y then use built-in date/time. tax dey cpy #$07 bne cmvtime txa does user want default time? bne cmvname if not. ldx #$03 mvdftime lda p8date,x move current default date/time sta d_credt,x dex bpl mvdftime cmvname lda (A3L),y y = index to file kind. cmp #$04 lda #$10 assume tree type bcc csvfkind lda #$D0 it's directory. csvfkind ldx namptr index to local name of pathname. ora pathbuf,x combine file kind with name length. sta d_stor sos calls this 'storage type'. and #$0F strip back to name length tay and use as counter for move. clc adc namptr calc end of name tax crname lda pathbuf,x move local name as filename sta d_stor,y dex dey bne crname ldy #$03 index to 'access' parameter lda (A3L),y sta d_attr iny also move 'file identification' lda (A3L),y sta d_filid cmvauxid iny move auxillary identification bytes lda (A3L),y sta d_auxid-5,y cpy #$06 bne cmvauxid lda xdosver save current xdos version # sta d_sosver lda compat and backward compatibility # sta d_comp lda #$01 usage is always 1 block sta d_usage lda d_head place back pointer to header block sta d_dhdr lda d_head+1 sta d_dhdr+1 lda d_stor storage type. and #$E0 is it a directory? beq cralcblk branch if seed file. ldx #$1E move header to data block cmvheadr lda d_stor,x sta gbuf+4,x dex bpl cmvheadr eor #$30 sta gbuf+4 make it a directory header mark. ldx #$07 overwrite password area and other cmvpass lda pass,x header info. sta gbuf+20,x lda xdosver,x sta gbuf+32,x dex bpl cmvpass ldx #$02 and include info about parent directory stx d_eof+1 cmvparnt lda d_entblk,x sta gbuf+39,x dex bpl cmvparnt lda h_entln lastly, the length of parent's sta gbuf+42 directory entries. cralcblk jsr alc1blk get address of file's data block bcs crerr3 sta d_frst sty d_frst+1 sta bloknml sty bloknml+1 jsr wrtgbuf go write data block of file bcs crerr3 inc h_fcnt add 1 to total # of files in this dir bne credone inc h_fcnt+1 credone jsr drevise go revise directories with new file bcs crerr3 jmp upbmap lastly, update volume bitmap entcalc .EQ *-ofsX lda #>gbuf set high address of dir entry sta zpt+1 index pointer. lda #$04 calc address of entry based ldx d_entnum on the entry #. H3689 clc H368A dex addr = gbuf + ((d_entnum-1) * h_entln) beq H3696 branch with carry clear = no errors. adc h_entln bcc H368A inc zpt+1 inc hi address. bcs H3689 always. H3696 sta zpt newly calculated low address. crerr3 rts carry set if error. drevise .EQ *-ofsX lda p8date beq H36A9 if no clock, then don't mod date/time. ldx #$03 modtime lda p8date,x move last modification date/time sta d_moddt,x to entry being updated. dex bpl modtime drevise1 .EQ *-ofsX H36A9 lda d_attr mark entry as backupable ora bkbitflg (bit 5 = backup needed) sta d_attr lda d_dev get device # of directory sta devnum to be revised lda d_entblk and address of direcotry block. ldx d_entblk+1 jsr rdblk read block into general purpose buffer bcs crerr3 jsr entcalc fix up ptr to entry location within gbuf. ldy h_entln now move 'd.' info to directory. dey H36CA lda d_stor,y sta (zpt),y dey bpl H36CA lda d_head is the entry block same as cmp bloknml the entry's header block? bne H36E0 if no, go save entry block lda d_head+1 then maybe, so test high addresses. cmp bloknml+1 beq uphead branch if they are the same block. H36E0 jsr wrtgbuf go write updated directory block. bcs crerr3 lda d_head get address of header block and ldx d_head+1 jsr rdblk go read in header block to modify. bcs crerr3 uphead ldy #$01 update current # of files in this dir. H36F2 lda h_fcnt,y sta gbuf+37,y (current entry count) dey bpl H36F2 lda h_attr also update header's attributes. sta gbuf+34 jsr wrtgbuf go write updated header bcs H375A ripple lda gbuf+4 test for 'root' directory because and #$F0 if it is, then directory revision eor #$F0 is complete (leaves carry clear). beq H3770 branch if done. lda gbuf+41 get entry # sta d_entnum lda gbuf+42 and the length of ertries in that dir sta h_entln lda gbuf+39 get addr of parent entry's dir block ldx gbuf+40 jsr rdblk read it bcs H375A jsr entcalc get indirect ptr to parent entry in gbuf lda p8date don't touch mod beq H373B if no clock... ldx #$03 update the modification date & time ldy #$24 for this entry too H3732 lda p8date,x sta (zpt),y dey dex bpl H3732 H373B jsr wrtgbuf write updated entry back to disk. bcs H375A if error. ldy #$25 compare current block # to this lda (zpt),y entry's header block. iny cmp bloknml are low addresses the same? sta bloknml bne H3751 branch if entry doesn't reside in same lda (zpt),y block as header. cmp bloknml+1 are high address the same? beq ripple they are the same, continue to root dir. H3751 lda (zpt),y not same so read in this dir's header. sta bloknml+1 jsr rdgbuf bcc ripple continue if read was good H375A rts tsterr lda #$52 not tree or dir, unrecognized type sec rts tstsos .EQ *-ofsX test if xdos disk. lda gbuf pointer to previous dir block ora gbuf+1 must be null bne tsterr lda gbuf+4 test for header and #$E0 cmp #$E0 bne tsterr H3770 clc no error rts findfile .EQ *-ofsX jsr lookfile see if file exists bcs nofind moventry .EQ *-ofsX ldy h_entln H377A lda (zpt),y move entry into storage sta d_stor,y dey bpl H377A lda #$00 no errors nofind rts lookfile .EQ *-ofsX jsr preproot go find volume bcs fnderr bne L37C5 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 #$40 bad path (carry set) rts lookfil0 .EQ *-ofsX L37C5 stz nofree reset free entry indicator. sec dir to be searched has header in this block. L37C9 stz totent reset entry counter. jsr looknam 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 #$51 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 sec if non-zero then 'path not found' beq fnf1 lda #$44 path not found rts fnf1 lda #$46 file not found 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 fnderr1 if error. lda gbuf+37 get the # of files contained in this sta entcntl directory. lda gbuf+38 sta entcnth lda gbuf+20 make sure password is disabled ldx #$00 sec rol a L3869 bcc L386C inx L386C asl a bne L3869 cpx #$05 is password disabled? beq movhead lda #$4A directory is not compatible fnderr1 sec rts movhead jsr movhed0 move directory info. jmp lookfil0 do next local pathname. movhed0 .EQ *-ofsX 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 entadr .EQ *-ofsX 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 looknam .EQ *-ofsX reset count of files per block lda h_maxent 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 entadr set address for current entry. inc nofree indicate a free spot has been found. bne L38F8 always. 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 lda (zpt),y compare names letter by letter 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 bcc L38C1 looking at next. preproot .EQ *-ofsX jsr findvol search vcb's and dev's for spec'd volume bcs novolume lda #$00 zero out directory temps ldy #$42 L3914 sta own_blk,y and owner info dey 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 .EQ *-ofsX jsr nxtpnam1 get new namptr in y and namlen in acc. sty namptr save new pathname pointer. rts (status reg according to accumulator) nxtpnam1 .EQ *-ofsX 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 .EQ *-ofsX 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 #$00 jsr rdblk bcs L39E2 ignore if unable to read. jsr logvcb go log in volume name. bcs L39E2 look at next if non-xdos disk mounted. jsr cmppnam is this the volume ? bcs L39E2 if not L3A29 rts mvdevnums .EQ *-ofsX ldx numdevs copy all dev #'s to be checked. L3A2D lda devlist,x active device list. and #$F0 strip device type info. sta loklst,x copy them to a temp workspace dex bpl L3A2D ldx numdevs rts fnddvcb .EQ *-ofsX look for vcb with this device# lda #$00 ldy #$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 .EQ *-ofsX 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 .EQ *-ofsX ldx vcbptr previously logged in volume? lda vcbbuf,x (acc = 0?) beq L3AB0 no, go prepare vcb. jsr cmpvcb does vcb match vol read? bcc L3B05 yes, do not disturb. logvcb1 .EQ *-ofsX L3AB0 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 .EQ *-ofsX compare volume name in vcb 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 .EQ *-ofsX check for other logged in volumes lda #$00 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 #$20 inc to next entry. bcc L3B2C branch if more to check L3B49 clc rts L3B4B sta duplflag duplicate has been found. stx vcbentry save pointer to conflicting vcb. sec error. rts tstfrblk .EQ *-ofsX test if enough free blocks available ldx vcbptr for request. lda vcbbuf+21,x check if proper count for this volume. ora vcbbuf+20,x bne L3BAD branch if count is non-zero. tkfrecnt .EQ *-ofsX jsr cntbms get # of bitmaps sta bmcnt and save. stz scrtch start count at 0 stz scrtch+1 lda #$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 .EQ *-ofsX 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 .EQ *-ofsX L3BEF asl a count the # of bits in this byte bcc L3BFA inc scrtch bne L3BFA inc scrtch+1 L3BFA ora #$00 bne L3BEF loop until all bits counted rts cntbms .EQ *-ofsX 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 a divide by 16. the result is lsr a the # of bitmaps. lsr a lsr a rts * deallocate a block's entry in bitmap * on entry, x,a = address of block dealloc .EQ *-ofsX stx bmcnt high address of block. pha save low address. ldx vcbptr check that bitmap block address is lda vcbbuf+19,x valid given the total # of blocks cmp bmcnt on the volume. pla bcc L3C8C branch if invalid tax and #$07 bit to be or'd in tay lda whichbit,y (shifting takes 7 bytes, but is slower) sta nofree save bit pattern. txa low block address. lsr bmcnt ror a get pointer to byte in block that lsr bmcnt represents the block address. ror a lsr bmcnt ror a sta bmptr save pointer. lsr bmcnt transfer bit which is page of bitmap rol half jsr fndbmap make sure device is correct one. bcs L3C8B error. lda bmacmap current map. cmp bmcnt is in-core bitmap the correct one ? beq L3C64 branch if yes. jsr upbmap put current map away. bcs L3C8B error. lda bmcnt get map # ldx vcbptr sta vcbbuf+28,x and make it current. lda bmadev jsr gtbmap read it into buffer bcs L3C8B L3C64 ldy bmptr index to byte lsr half lda nofree (get indiviual bit) bcc L3C77 branch if on page 1 of bitmap ora bmbuf+$100,y sta bmbuf+$100,y bcs L3C7D always. bmbufhi .EQ *-ofsX this address + 2 is used as an L3C77 ora bmbuf,y absolute reference to bmbuf high byte. sta bmbuf,y L3C7D lda #$80 mark bitmap as modified tsb bmastat inc deblock inc count of blocks deallocated bne L3C8A inc deblock+1 L3C8A clc L3C8B rts L3C8C lda #$5A bitmap block # impossible. sec bitmap disk address wrong rts (maybe data masquerading as indx block) alc1blk .EQ *-ofsX jsr fndbmap get address of bitmap. bcs L3CB8 error. L3C95 ldy #$00 begin search at start of bitmap block. sty half which half (page) to search L3C9A lda bmbuf,y bne L3CB9 free blocks indicated by 'on' bits iny bne L3C9A check all in 1st page. inc half now search page 2. inc basval base value = base address / 2048. L3CA8 lda bmbuf+$100,y search 2nd half for free block bne L3CB9 iny bne L3CA8 inc basval add 2048 offset for next page. jsr nxtbmap get next bitmap (if exists) and bcc L3C95 update vcb. branch if no error. L3CB8 rts return error. L3CB9 sty bmptr save index pointer to valid bit group. lda basval prep for block address calculation sta scrtch+1 tya address of bit pattern. asl a multiply this and basval by 8 rol scrtch+1 asl a rol scrtch+1 asl a rol scrtch+1 tax low address within 7 of actual address sec lda half beq L3CDB branch if allocating from 1st half. lda bmbuf+$100,y get pattern from 2nd page. bcs L3CDE always. L3CDB lda bmbuf,y get bit pattern from 1st page. L3CDE rol a find left most 'on' bit bcs L3CE4 if found. inx adjust low address. bne L3CDE always. L3CE4 lsr a restore pos'n of all but left most bit. bcc L3CE4 loop until mark moves into carry. stx scrtch save low address. ldx half which half of bitmap ? bne L3CF4 if page 2. sta bmbuf,y beq L3CF7 always. L3CF4 sta bmbuf+$100,y update to show allocated block in use. L3CF7 lda #$80 indicate map is modified. tsb bmastat ldy vcbptr subtract 1 from total free vcb blocks lda vcbbuf+20,y to account for newly allocated block. sbc #$01 (carry is set) sta vcbbuf+20,y bcs L3D10 if high free count doesn't need adj. lda vcbbuf+21,y adjust high count dec a sta vcbbuf+21,y L3D10 clc no errors. lda scrtch return address in y,a of newly ldy scrtch+1 allocated block. rts nxtbmap .EQ *-ofsX inc to next bitmap ldy vcbptr but 1st make sure there is another one. lda vcbbuf+19,y lsr a lsr a lsr a lsr a cmp vcbbuf+28,y are there more maps ? beq L3D60 if no more to look at. lda vcbbuf+28,y add 1 to current map inc a sta vcbbuf+28,y jsr upbmap fndbmap .EQ *-ofsX ldy vcbptr lda vcbbuf+16,y get device #. cmp bmadev does this map match this device ? beq L3D4A yes. jsr upbmap otherwise, save other volume's bitmap bcs L3D5F ldy vcbptr lda vcbbuf+16,y sta bmadev and read in fresh bitmap for this dev. L3D4A ldy bmastat is it already modified ? bmi L3D54 yes, return pointer jsr gtbmap otherwise read in fresh bitmap. bcs L3D5F if error. L3D54 ldy vcbptr get relative block # of bitmap. lda vcbbuf+28,y asl a 2 pages per block sta basval clc no errors. L3D5F rts L3D60 lda #$48 request can't be filled sec error rts upbmap .EQ *-ofsX clc lda bmastat is current map modified ? bpl L3D5F no. jsr wrtbmap update device. bcs L3D5F if error on writing. lda #$00 sta bmastat mark bitmap buffer as free rts gtbmap .EQ *-ofsX read bitmap specified by dev and vcb. sta bmadev ldy vcbptr get lowest map # with free blocks in it lda vcbbuf+28,y sta bmacmap associate offset with bitmap ctrl block. clc add this # to the base address of adc vcbbuf+26,y 1st bitmap and save in bmadadr which sta bmadadr is address of bitmap to be used. lda vcbbuf+27,y adc #$00 sta bmadadr+1 lda #$01 read device command L3D92 sta A4L lda devnum save current dev # pha lda bmadev get bitmap's dev # sta devnum lda bmadadr and disk address sta bloknml lda bmadadr+1 sta bloknml+1 lda bmbufhi+2 address of the buffer (low = 0) jsr dobitmap tax error code (if any). pla restore current dev # sta devnum bcc L3DB6 and return it if no error. txa error code L3DB6 rts rdblk .EQ *-ofsX sta bloknml stx bloknml+1 jsr rdgbuf rts wrtbmap .EQ *-ofsX write bitmap. lda #$02 write command. bne L3D92 always. wrtgbuf .EQ *-ofsX lda #$02 write command bne L3DC9 always. rdgbuf .EQ *-ofsX lda #$01 read command. L3DC9 sta A4L pass to device handler. lda #>gbuf general buffer. dobitmap .EQ *-ofsX php no interrupts sei sta buf+1 buffer high. stz buf buffer low (always on page boundary) stz p8error clear global error code. lda #$FF indicates reg call made to dev handler sta ioaccess lda devnum transfer dev # for dispatcher to sta unitnum convert to unit #. jsr dmgr call the driver. bcs L3DE8 if error. plp restore interrupts. clc rts L3DE8 plp file i/o error. restore interrupts. sec rts * get mark command getmark .EQ *-ofsX ldx fcbptr index to open fcb. ldy #$02 index to user's mark parmeter. L3DF0 lda fcbbuf+18,x transfer current position sta (A3L),y to user's parameter list inx iny cpy #$05 transfer 3 bytes bne L3DF0 clc rts L3DFD lda #$4D invalid position sec rts * set mark command setmark .EQ *-ofsX ldy #$04 index to user's desired position. ldx fcbptr file's control block index. inx inc by 2 for index to hi eof inx sec indicate comparisons are necessary. L3E09 lda (A3L),y move it to 'tpos' sta tposll-2,y bcc L3E18 branch if mark < eof cmp fcbbuf+21,x bcc L3E18 branch if mark qualifies. bne L3DFD branch if mark > eof (invalid position) dex L3E18 dey move/compare next lower byte of mark. tya test for all bytes moved/tested. eor #$01 preserves carry status. bne L3E09 branch if more. rdposn .EQ *-ofsX ldy fcbptr test to see if new position is lda fcbbuf+19,y within the same (current) data block. and #$FE sta scrtch lda tposlh middle byte of new position sec sbc scrtch sta scrtch bcc L3E44 branch if < current position. cmp #$02 must be within 512 bytes of beginning bcs L3E44 of current position. lda tposhi make sure within the same 64k. cmp fcbbuf+20,y bne L3E44 branch if not. jmp svmark if so, adj fcb, position ptr and return. L3E44 lda fcbbuf+7,y determine file type for positioning. beq L3E50 0 = invalid file type. cmp #$04 tree class file? bcc L3E59 yes, go position. jmp dirmark no, test for dir type. L3E50 ldy #$A4 clear illegal filetype entry in fcb sta fcbbuf,y lda #$43 and report error sec rts L3E59 lda fcbbuf+7,y use storage type as # of index levels sta levels since 1=seed, 2=sapling, 3=tree. lda fcbbuf+8,y and #$40 if previous data was modified then beq L3E6B disk must be updated. jsr wfcbdat bcs L3ED4 if error. L3E6B ldy fcbptr test to see if current index block lda fcbbuf+20,y is usable by checking if new and #$FE position is within 128k of the sta scrtch beginning of current sapling level lda tposhi chunk. sec sbc scrtch bcc L3E9D branch if a new index block is needed. cmp #$02 is new position within 128k of old ? bcs L3E9D branch if not. ldx levels is it a seed file ? dex bne datlevel no, use current indexes. L3E89 lda tposlh is new position < 512 ? lsr a ora tposhi bne L3EEF no, mark both data and index block as lda fcbbuf+12,y unallocated. 1st block is only block sta bloknml and it's data. lda fcbbuf+13,y high block address. jmp rnewpos go read in block and set statuses. L3E9D lda fcbbuf+8,y check to see if previous index block and #$80 was modified. beq L3EA9 read in over it if current up to date. jsr wfcbidx go update index on disk (fcb block addr) bcs L3ED4 L3EA9 ldx levels be sure there is a top index cpx #$03 before reading it... beq posindex branch if file is a tree. lda tposhi is new position within range of a lsr a sapling file (less than 128k) ? php save results lda #$07 (no level is allocated for new pos'n) plp restore z-flag. bne L3F18 go mark all as dummy. jsr clrstats clr status bits 0,1,2 (index/data/alloc) dex check for seed beq L3E89 if seed, check for position < 512. jsr rfcbfst go get only index block. bcs L3ED4 if error. ldy fcbptr save newly loaded index block's address. lda bloknml sta fcbbuf+14,y lda bloknml+1 sta fcbbuf+15,y bcc datlevel branch always L3ED4 rts posindex jsr clrstats clr all alloc requirements for previous jsr rfcbfst position. get highest level index block bcs L3ED4 lda tposhi then test for a sap level index block lsr a tay lda (zpt),y inc zpt+1 cmp (zpt),y (both high and low = 0 if no index exists) bne saplevel tax are both bytes 0 ? bne saplevel dec zpt+1 L3EEF lda #$03 show neither index or data block alloc'd bra L3F18 saplevel sta bloknml read in next lower index block. lda (zpt),y (high address) sta bloknml+1 dec zpt+1 jsr rfcbidx read in sapling level bcs L3ED4 datlevel lda tposhi get block address of data block lsr a lda tposlh ( if there is one ) ror a tay lda (zpt),y data block address low inc zpt+1 cmp (zpt),y bne L3F51 tax bne L3F51 lda #$01 show data block as never been allocated dec zpt+1 L3F18 ldy fcbptr set status to show what's missing ora fcbbuf+8,y sta fcbbuf+8,y lsr a discard bit that says data block lsr a unallocated because carry indicates if jsr zipdata index block is invalid and needs to be bcc L3F61 zeroed. branch if it doesn't need zeroed jsr zeroindex zero index block in user's i/o buffer bra L3F61 zeroindex .EQ *-ofsX lda #$00 tay L3F30 sta (zpt),y zero out the index half of the user's iny i/o buffer bne L3F30 inc zpt+1 L3F37 sta (zpt),y iny bne L3F37 dec zpt+1 restore proper address rts zipdata .EQ *-ofsX lda #$00 tay L3F42 sta (datptr),y zero out data area iny bne L3F42 inc datptr+1 L3F49 sta (datptr),y iny bne L3F49 dec datptr+1 rts L3F51 sta bloknml get data block of new position lda (zpt),y (high address) dec zpt+1 rnewpos .EQ *-ofsX sta bloknml+1 jsr rfcbdat bcs L3F86 if error. jsr clrstats show whole chain is allocated. svmark .EQ *-ofsX L3F61 ldy fcbptr update position in fcb iny iny ldx #$02 L3F68 lda fcbbuf+18,y save old mark in case calling routine sta oldmark,x fails later. lda tposll,x sta fcbbuf+18,y dey dex move 3 byte position marker bpl L3F68 clc set up indirect address to buffer lda datptr page pointed to by the current sta sos position marker. lda tposlh and #$01 adc datptr+1 sta sos+1 L3F86 rts carry set if error clrstats .EQ *-ofsX ldy fcbptr clear allocation states for data block lda fcbbuf+8,y and both levels of indexes/ and #$F8 sta fcbbuf+8,y indicates that either they exist now rts or unnecessary for current position. dirmark .EQ *-ofsX cmp #$0D is it a directory ? beq L3F9C yes... lda #$4A no, so compatability problem. jsr p8errv should not have been opened !!! L3F9C lda scrtch recover results of previous subtraction. lsr a use difference as counter for how many sta cntent blocks must be read to get to new pos'n. lda fcbbuf+19,y test for positive direction cmp tposlh indicated by carry. bcc L3FB9 if set, position forward. otherwise, L3FAB ldy #$00 read directory file in reverse order. jsr dirpos1 read previous block. bcs L3FD6 if error. inc cntent count up to 128. bpl L3FAB loop if more blocks to pass over. bmi L3F61 always. L3FB9 ldy #$02 position is forward from current. jsr dirpos1 read next directory block bcs L3FD6 if error. dec cntent bne L3FB9 loop if position not found in this block beq L3F61 branch always. dirpos1 .EQ *-ofsX lda (datptr),y get link address of previous or next sta bloknml directory block. cmp #$01 test for null byte into carry iny but first be sure there is a link. lda (datptr),y get the rest of the link. bne L3FD8 branch if certain link exists. bcs L3FD8 was the low part null as well ? lda #$4C something is wrong with directory file! L3FD6 sec error. rts L3FD8 sta bloknml+1 * read file's data block rfcbdat .EQ *-ofsX lda #$01 read command sta A4L ldx #datptr points at address of data buffer. jsr fileio1 go do file input. bcs L3FF2 error. ldy fcbptr lda bloknml sta fcbbuf+16,y save block # just read in fcb. lda bloknml+1 sta fcbbuf+17,y L3FF2 rts rfcbidx .EQ *-ofsX prepare to read index block. lda #$01 read command sta A4L ldx #$48 address of current index buffer. jsr fileio1 go read index block. bcs L400C error ldy fcbptr lda bloknml sta fcbbuf+14,y save block address of this index in fcb lda bloknml+1 sta fcbbuf+15,y clc L400C rts L400D lda #$02 write command dc h'2C' skip next instruction rfcbfst .EQ *-ofsX lda #$01 read command. pha save the command lda #$0C ora fcbptr add offset to fcbptr tay pla ldx #$48 rd block into index portion of file buf dofileio .EQ *-ofsX sta A4L command lda fcbbuf,y get disk block address from fcb. sta bloknml block 0 not legal cmp fcbbuf+1,y bne L4031 cmp #$00 are both bytes 0 ? bne L4031 no, continue request lda #$0C otherwise, allocation error. jsr sysdeath doesn't return... L4031 lda fcbbuf+1,y high address of disk block sta bloknml+1 fileio1 .EQ *-ofsX php no interrupts sei lda $00,x get memory address of buffer from sta buf page zero pointed to by x register lda $01,x sta buf+1 and pass address to device handler ldy fcbptr lda fcbbuf+1,y sta devnum along with device #. lda #$FF also, set to indicate reg call made to sta ioaccess device handler. lda devnum transfer device # for dispatcher sta unitnum to convert to unit #. stz p8error clear global error code. jsr dmgr call the driver. bcs L405E if error. plp restore interrupts clc rts L405E plp restore interrupts sec rts wfcbfst .EQ *-ofsX jsr upbmap update the bitmap bra L400D and write file's 1st block. wfcbdat .EQ *-ofsX ldx #datptr point at memory address with x and lda #$10 disk address with y. ora fcbptr add offset to fcbptr tay and put in y. lda #$02 write data block. jsr dofileio bcs L4096 if errors. lda #$BF mark data status as current. bra L408D wfcbidx .EQ *-ofsX jsr upbmap update bitmap. ldx #$48 point to address of index buffer lda #$0E and block address of that index block. ora fcbptr tay lda #$02 jsr dofileio go write out index block. bcs L4096 if errors. lda #$7F mark index status as current. L408D ldy fcbptr change status byte to reflect and fcbbuf+8,y successful disk file update. sta fcbbuf+8,y (carry is unaffected) L4096 rts openf .EQ *-ofsX jsr findfile look up the file. bcc L40A0 if ok. cmp #$40 is this opening a root directory ? bne L40A7 if not, then error. L40A0 jsr tstopen are any other files writing to this bcc L40AD same file ? branch if not. L40A5 lda #$50 file is busy, shared access not allowed. L40A7 sec rts L40A9 lda #$4B file is wrong storage type. sec rts L40AD ldy fcbptr get address of 1st free fcb found. lda fcbflg if this byte <> 0 then free fcb found bne L40B9 and available for use. lda #$42 fcb full error. sec rts L40B9 ldx #$1F assign fcb, lda #$00 but clean it first. L40BD sta fcbbuf,y iny dex bpl L40BD lda #$06 start claiming it by moving in file info tax using x as source index ora fcbptr and y as destination (fcb). tay L40CB lda d_dev-1,x move ownership info. sta fcbbuf,y note: this code depends upon the defined dey order of both the fcb and directory dex entry buffer. bne L40CB lda d_stor get storage type and lsr a strip off file name length lsr a by dividing by 16. lsr a lsr a tax save in x for later comparison sta fcbbuf+7,y and in fcb for future access. lda d_attr get file's attributes and use it and #$03 as a default access request. cpx #$0D if directory, don't allow write enable. bne L40EB and #$01 read enabled bit L40EB sta fcbbuf+9,y and #$02 check for write enabled request. beq L40F7 branch for open as read-only lda totent otherwise, be sure no one else is bne L40A5 reading the same file. branch if busy. L40F7 cpx #$04 is it a tree file type ? bcc L40FF yes. cpx #$0D is it a directory type ? bne L40A9 if not, wrong storage type. L40FF ldx #$06 move address of 1st block of file, end L4101 sta bloknml+1 of file and current usage count. lda fcbptr ora ofcbtbl,x this is done via a translation table tay between directory info and fcb. lda d_frst,x sta fcbbuf,y dex bpl L4101 last loop stores hi address of 1st block sta bloknml and this is the low one. ldy fcbptr lda cntent this was set up by 'tstopen'. sta fcbbuf,y claim fcb for this file. jsr alcbuffr go allocate buffer in memory tables. bcs L4147 if errors. jsr fndfcbuf rtn addr of bufs in data & index ptrs. lda flevel mark level at which sta fcbbuf+27,y file was opened. lda fcbbuf+7,y file must be positioned at beginning. cmp #$04 is it a tree file ? bcs L415E no, assume a directory. lda #$FF fool the position routine into giving sta fcbbuf+20,y a valid position with preloaded data, ldy #$02 etc. set desired position to 0. lda #$00 L413C sta tposll,y dey bpl L413C jsr rdposn let tree position routine do the rest. bcc L4163 if successful. L4147 pha save error code. ldy fcbptr free buffer space. lda fcbbuf+11,y beq L4156 if no bufnum, ok because never alloc'd. jsr relbuffr go release buffer. ldy fcbptr since error was before file was L4156 lda #$00 successfully opened, then it is sta fcbbuf,y necessary to release fcb also. pla error code. sec rts L415E jsr rfcbdat read in 1st block of directory file. bcs L4147 return error after freeing buffer & fcb. L4163 ldx vcbptr index to vcb. inc vcbbuf+30,x add 1 to # of files currently open lda vcbbuf+17,x and indicate that this volume has at ora #$80 least 1 file active. sta vcbbuf+17,x ldy fcbptr index to fcb. lda fcbbuf,y return ref # to user. ldy #$05 sta (A3L),y clc open is successful rts * test open * is there an open file? tstopen .EQ *-ofsX lda #$00 sta cntent returns the ref # of a free fcb. sta totent flag to indicate file already open. sta fcbflg flag indicates a free fcb is available. L4188 tay index to next fcb. ldx fcbflg test for free fcb found. bne L4191 if already found. inc cntent L4191 lda fcbbuf,y is this fcb in use ? bne L41A3 yes. txa if not, should we claim it ? bne L41C1 branch if free fcb already found. sty fcbptr save index to new free fcb. lda #$FF set fcb flag to indicate sta fcbflg free fcb found. bne L41C1 branch always to test next fcb. L41A3 tya add offset to index to ownership info ora #$06 tay and put it back in y. ldx #$06 index to directory entry owner info. L41A9 lda fcbbuf,y all bytes must match to say that it's cmp d_dev-1,x the same file again. bne L41C1 if not, then next fcb. dey index to next lower bytes. dex bne L41A9 loop to check all owner info. inc totent file is already open, now see lda fcbbuf+9,y if it's already opened for write. and #$02 if so report file busy (with carry set). beq L41C1 branch if this file is read access only. sec rts L41C1 tya calc position of next fcb. and #$E0 first strip any possible index offsets. clc adc #$20 inc to next fcb. bne L4188 branch if more to compare. clc report no conflicts. rts * read command readf .EQ *-ofsX jsr mvdbufr xfer buffer address and request count jsr mvcbytes to a more accessable location, also pha get fcb attributes and save on stack. jsr calcmrk calc mark after read, test if mark > eof pla carry set means end mark > eof. and #$01 test for read enabled. bne L41DE branch if ok to read. lda #$4E illegal access. bne L4202 always. L41DE bcc L4205 branch if result mark < eof. adjust ldy fcbptr request to read until just before eof. lda fcbbuf+21,y result = (eof-1) - position sbc tposll sta cbytes sta rwreql lda fcbbuf+22,y sbc tposlh sta cbytes+1 sta rwreqh ora cbytes if both bytes = 0 then eof error bne L4210 lda #$4C eof error L4202 jmp errfix1 L4205 lda cbytes ora cbytes+1 bne L4210 if read request definitely non-zero. L420D jmp rwdone do nothing. L4210 jsr valdbuf validate user's data buffer range. bcs L4202 branch if memory conflict. jsr gfcbstyp get storage type cmp #$04 and find out if it's a tree or other. bcc L421F branch if a tree file jmp dread otherwise assume it's a directory. L421F jsr rdposn set up data pointer. bcs L4202 errors. jsr preprw test for newline, setup for partial jsr readpart read. move current data buffer contents bvs L420D to user area. branch if satisfied. bcs L421F indicates newline is set. lda rwreqh how many blocks are to be read ? lsr a if < 2 then use the slow way. beq L421F sta cmdtemp save bulk block count. jsr gfcbstat make sure current data area doesn't and #$40 need writing before resetting ptr to bne L421F read into user's area. branch if data sta ioaccess needs to be written to force 1st call lda usrbuf thru all dev handler checking. make sta datptr the data buffer the user's space. lda usrbuf+1 sta datptr+1 L4249 jsr rdposn get next block directly into user space. bcs L42B7 if error. L424E inc datptr+1 inc all ptrs by one block (512 bytes) inc datptr+1 dec rwreqh dec rwreqh inc tposlh inc tposlh bne L4269 if pos'n doesn't get to a 64k boundary inc tposhi otherwise, must check for a 128k one. lda tposhi carry set if 128k boundary reached. eor #$01 lsr a L4269 dec cmdtemp has all been read fast ? bne L427B branch if more to read. jsr fxdatptr go fix up data pointer to xdos buffer. lda rwreql test for end of read. ora rwreqh are both 0 ? beq L42C3 yes, done. bne L421F no, read last partial block L427B bcs L4249 lda tposhi get index to next block address lsr a lda tposlh ror a tay index to address = int(pos/512) lda (zpt),y get low address sta bloknml inc zpt+1 cmp (zpt),y are hi and low address the same? bne L4299 no, it's a real block address. cmp #$00 are both bytes 0 ? bne L4299 no, must be real data. sta ioaccess don't do repeat io just after sparse. beq L429C branch always (carry set). L4299 lda (zpt),y get high address clc L429C dec zpt+1 bcs L4249 if no block to read. sta bloknml+1 lda ioaccess has 1st call gone to device yet ? beq L4249 no, go thru normal route clc php interrupts can't occur during dmgr call sei lda datptr+1 reset hi buffer address for dev handler sta buf+1 jsr dmgr bcs L42B6 if error plp bcc L424E no errors, branch always. L42B6 plp restore interrupts. L42B7 pha save error code. jsr fxdatptr go restore data pointers, etc. pla errfix1 .EQ *-ofsX pha save error code jsr rwdone pass back # of bytes actually read pla sec error rts rwdone .EQ *-ofsX L42C3 ldy #$06 return total # of bytes actually read sec derived from cbytes-rwreq. lda cbytes sbc rwreql sta (A3L),y iny lda cbytes+1 sbc rwreqh sta (A3L),y jmp rdposn leave with valid position in fcb. preprw .EQ *-ofsX ldy fcbptr adj pointer to user's buffer to make sec the transfer lda usrbuf sbc tposll sta usrbuf bcs L42E9 if no adjustment to hi address needed dec usrbuf+1 L42E9 lda fcbbuf+31,y test for new line enabled. clc beq L42F9 if new line not enabled. sec carry indicates new line enabled sta nlmask lda fcbbuf+10,y move newline character to more sta nlchar accesible spot. L42F9 ldy tposll index to 1st data. lda datptr reset low order of position pointer to sta sos beginning of page. ldx rwreql get low order count of requested bytes. rts return statuses. readpart .EQ *-ofsX txa x = low count of bytes to move. bne L430F branch if request is not an even page. lda rwreqh a call of 0 bytes should never get here! beq L435D branch if nothing to do. dec rwreqh L430F dex L4310 lda (sos),y move data to user's buffer sta (usrbuf),y bcs tstnewl test for newline 1st ! L4316 txa note: x must be unchanged from tstnewl ! beq L4332 go see if read request is satified... L4319 dex dec # of bytes left to move. iny page crossed ? bne L4310 no, move next byte. lda sos+1 test for end of buffer, but first inc usrbuf+1 adjust user buffer pointer inc tposlh and position bne L4329 inc tposhi L4329 inc sos+1 and sos buffer high address. eor datptr+1 (carry is undisturbed) beq L4310 branch if more to read in buffer. clv indicate not finished. bvc L4360 always. L4332 lda rwreqh beq L4350 branch if request is satisfied. iny done with this block of data ? bne L4340 no, adjust high byte of request. lda sos+1 maybe, check for end of block buffer. eor datptr+1 (don't disturb carry). bne L4343 if hi count can be dealt with next time L4340 dec rwreqh L4343 dey restore proper value bra L4319 tstnewl lda (sos),y get last byte transferred again. and nlmask only bits on in mask are significant. eor nlchar does it match newline character? bne L4316 no, read next. L4350 iny adjust position. bne L435D inc usrbuf+1 inc pointers inc tposlh bne L435D inc tposhi L435D bit setvflg (sets v flag) L4360 sty tposll save low position bvs L4366 inx leave request as +1 for next call L4366 stx rwreql and remainder of request count. php save statuses clc adjust user's low buffer address tya adc usrbuf sta usrbuf bcc L4374 inc usrbuf+1 adjust hi address as needed. L4374 plp restore return statuses. setvflg .EQ *-ofsX this byte ($60) is used to set v flag. rts fxdatptr .EQ *-ofsX put current user buffer lda datptr address back to normal sta usrbuf lda datptr+1 sta usrbuf+1 bank pair byte should be moved also. ldy fcbptr restore buffer address jmp fndfcbuf * read directory file dread .EQ *-ofsX L4384 jsr rdposn bcs L43B8 pass back any errors. jsr preprw prepare for transfer. jsr readpart move data to user's buffer. bvc L4384 repeat until request is satisfied. jsr rwdone update fcb as to new position. bcc L43B6 branch if done with no errors. cmp #$4C was last read to end of file ? sec anticipate some other error. bne L43B7 branch if not eof error. jsr svmark jsr zipdata clear out data block. ldy #$00 provide dummy back pointer for future ldx fcbptr re-position. x = hi byte of last block L43A6 lda fcbbuf+16,x sta (datptr),y lda #$00 mark current block as impossible sta fcbbuf+16,x inx iny inc indexes to do both hi and low bytes cpy #$02 bne L43A6 L43B6 clc no error L43B7 rts L43B8 jmp errfix1 report how much xfer'd before error. mvcbytes .EQ *-ofsX move request count to a more ldy #$04 accessable location lda (A3L),y sta cbytes sta rwreql iny lda (A3L),y sta cbytes+1 sta rwreqh ldy fcbptr return y = val(fcbptr), lda fcbbuf+9,y a = attributes clc and carry clear... rts mvdbufr .EQ *-ofsX move the pointer to user's buffer ldy #$02 to the block file manager lda (A3L),y sta usrbuf z-page area iny lda (A3L),y sta usrbuf+1 gfcbstyp .EQ *-ofsX ldy fcbptr return storage type lda fcbbuf+7,y rts * this subroutine adds the requested byte count to mark and returns sum * in scrtch and also returns mark in tpos and oldmark. * * on exit: * y,x,a is unknown * carry set indicates scrtch > eof calcmrk .EQ *-ofsX ldx #$00 ldy fcbptr clc L43EE lda fcbbuf+18,y sta tposll,x sta oldmark,x adc cbytes,x sta scrtch,x txa eor #$02 cbytes+2 always=0 beq L4406 iny inx bne L43EE always. eoftest .EQ *-ofsX L4406 lda scrtch,x new mark in scrtch. cmp fcbbuf+21,y is new position > eof ? bcc L4414 no, proceed. bne L4414 yes, adjust 'cbytes' request dey dex all tree bytes compared ? bpl L4406 no, test next lowest L4414 rts werreof .EQ *-ofsX jsr plus2fcb reset eof to pre-error position. L4418 lda oldeof,x place oldeof back into fcb sta fcbbuf+21,y lda oldmark,x also reset mark to last best sta fcbbuf+18,y write position sta scrtch,x and copy mark to scrtch for test of dey eof less than mark. dex bpl L4418 jsr plus2fcb get pointers to test eof < mark. jsr eoftest carry set means mark > eof !! * drop into wadjeof to adjust eof to mark if necessary wadjeof .EQ *-ofsX jsr plus2fcb get y=fcbptr+2, x=2, a=y. L4434 lda fcbbuf+21,y copy eof to old eof sta oldeof,x bcc L4442 and if carry set... lda scrtch,x then copy scrtch to fcb's eof. sta fcbbuf+21,y L4442 dey dex copy all 3 bytes bpl L4434 rts plus2fcb .EQ *-ofsX lda #$02 on exit both a and y = fcbptr+2. tax x = 2 ora fcbptr tay rts * write command writef .EQ *-ofsX first determine if requested jsr mvcbytes write is legal. pha jsr calcmrk save a copy of eof to old eof, set/clr jsr wadjeof carry to determine if new mark > eof. pla get attributes again. and #$02 is write enabled ? bne L4462 yes, continue... L445E lda #$4E illegal access error. bne L44A2 L4462 jsr tstwprot otherwise, make sure device is not bcs L44A2 write protected. if so, branch to abort. lda cbytes ora cbytes+1 anything to write ? bne L4472 branch if so, jmp rwdone else do nothing. L4472 jsr mvdbufr move the user's buffer ptr to bfm zero cmp #$04 page area, also get storage type. bcs L445E if not tree, return an access error. L4479 jsr rdposn bcs L44A2 jsr gfcbstat and #$07 beq L44E9 ldy #$00 is enough disk space available for L4487 iny indexes and data block ? lsr a bne L4487 sty reql sta reqh jsr tstfrblk bcs L44A2 pass back any errors. jsr gfcbstat now get more specific. and #$04 are we lacking a tree top ? beq L44AC no, test for lack of sapling level index jsr topdown go allocate tree top and adj file type. bcc L44B8 continue with allocation of data block. L44A2 pha save error. jsr errfix1 error return. jsr werreof adjust eof and mark to pre-error state. pla restore error code. sec rts L44AC jsr gfcbstat get status byte again. and #$02 do we need a sapling level index block ? beq L44B8 no, assume it's just a data block needed jsr sapdown go alloc an indx blk and update tree top bcs L44A2 if error. L44B8 jsr alcwblk go allocate for data block. bcs L44A2 jsr gfcbstat clear allocation required bits in status ora #$80 but first indicate index block is dirty. and #$F8 sta fcbbuf+8,y lda tposhi calculate position within index block. lsr a lda tposlh ror a tay now put block address into index block. inc zpt+1 high byte first. lda scrtch+1 tax sta (zpt),y dec zpt+1 restore pointer to lower page of index lda scrtch block. get low block address. sta (zpt),y store low address. ldy fcbptr update fcb to indicate that this block sta fcbbuf+16,y is allocated. txa get high address again. sta fcbbuf+17,y L44E9 jsr preprw jsr wrtpart bvc L4479 jmp rwdone update fcb with new position wrtpart .EQ *-ofsX txa bne L44FF branch if request is not even pages lda rwreqh a call of 0 bytes should never get here! beq L4546 do nothing dec rwreqh L44FF dex lda (usrbuf),y move data from user's buffer sta (sos),y txa beq L4525 L4507 iny page crossed ? bne L44FF no, keep moving. lda sos+1 test for end of buffer inc usrbuf+1 but first adjust user buffer pointer inc tposlh and position bne L451C inc tposhi bne L451C lda #$4D out of range if > 32MB bne L44A2 L451C inc sos+1 adjust sos buffer high address eor datptr+1 (carry is undisturbed) beq L44FF branch if more to write to buffer. clv indicates not finished. bvc L4549 always. L4525 lda rwreqh beq L4539 branch if request satisfied. iny done with this block of data ? bne L4533 if not. lda sos+1 this is necessary for proper eor datptr+1 adjustment of request count bne L4536 L4533 dec rwreqh L4536 dey reset modified y bra L4507 L4539 iny and position bne L4546 inc usrbuf+1 inc pointers inc tposlh bne L4546 inc tposhi L4546 bit setvflg set v flag L4549 sty tposll save low position stx rwreql and remainder of request count. php save statuses jsr gfcbstat ora #$50 sta fcbbuf+8,y clc adjust user's low buffer address lda tposll adc usrbuf sta usrbuf bcc L4564 inc usrbuf+1 adjust high address as needed. L4564 jsr fcbused set directory flush bit. plp restore return statuses rts topdown .EQ *-ofsX jsr swapdown make current 1st block an entry in new bcs L45B1 top. branch if errors. jsr gfcbstyp get storage type * has storage type been changed to 'tree' ? if not, assume it was originally * a seed and both levels need to be built. otherwise, only an index needs * to be allocated. cmp #$03 tree type beq L457A jsr swapdown make previous swap a sap level index bcs L45B1 block. branch if errors. L457A jsr alcwblk get another block address for the sap bcs L45B1 level index. branch if errors. lda tposhi calculate position of new index block lsr a in the top of the tree. tay lda scrtch get address of newly allocated index tax block again. sta (zpt),y inc zpt+1 lda scrtch+1 sta (zpt),y save hi address dec zpt+1 ldy fcbptr make newly allocated block the current sta fcbbuf+15,y index block. txa sta fcbbuf+14,y jsr wfcbfst save new top of tree bcs L45B1 jmp zeroindex zero index block in user's i/o buffer. sapdown .EQ *-ofsX jsr gfcbstyp find out if dealing with a tree. cmp #$01 if seed then adj to file type is needed. beq L45B2 branch if seed jsr rfcbfst otherwise read in top of tree. bcc L457A if no error. L45B1 rts return errors. swapdown .EQ *-ofsX make current seed into a sapling. L45B2 jsr alcwblk allocate a block before swap. bcs L45F6 return errors. ldy fcbptr get previous first block lda fcbbuf+12,y address into index block. pha save temporarily while swapping in new lda scrtch top index. get new block address (low) tax sta fcbbuf+12,y lda fcbbuf+13,y pha lda scrtch+1 and high address too sta fcbbuf+13,y sta fcbbuf+15,y make new top also the current index in txa memory. get low address again. sta fcbbuf+14,y inc zpt+1 make previous the 1st entry in sub index pla sta (zpt) dec zpt+1 pla sta (zpt) jsr wfcbfst save new file top. bcs L45F6 if error. jsr gfcbstyp now adjust storage type by adding 1 adc #$01 (seed becomes sapling becomes tree) sta fcbbuf+7,y lda fcbbuf+8,y mark storage type modified ora #$08 sta fcbbuf+8,y clc no error L45F6 rts alcwblk .EQ *-ofsX jsr alc1blk bcs L4616 jsr gfcbstat mark usage as modified ora #$10 sta fcbbuf+8,y lda fcbbuf+24,y inc current usage count by 1 clc adc #$01 sta fcbbuf+24,y lda fcbbuf+25,y adc #$00 sta fcbbuf+25,y L4615 clc no error L4616 rts tstwprot .EQ *-ofsX check for 'never been modified' jsr gfcbstat condition and #$F0 bne L4615 ordinary rts if known write ok. lda fcbbuf+1,y get file's dev #. sta devnum get current status of block device. twrprot1 .EQ *-ofsX make the device status call sta unitnum lda bloknml+1 pha lda bloknml save the current block values pha stz A4L stz bloknml zero the block # stz bloknml+1 php sei jsr dmgr bcs L463B branch if write protect error lda #$00 otherwise, assume no errors. L463B plp restore interrupt status clc tax save error. beq L4641 branch if no error sec else, set carry to show error. L4641 pla sta bloknml restore the block # pla sta bloknml+1 txa rts carry is indeterminate. * close command closef .EQ *-ofsX close all ? ldy #$01 lda (A3L),y bne L4683 no, just one of them. sta cferr clear global close error. lda #$00 start at the beginning. L4654 sta fcbptr save current low byte of pointer. tay get the level at which the file lda fcbbuf+27,y was opened. cmp flevel if file's level is < global level bcc L4675 then don't close. lda fcbbuf,y is this reference file open ? beq L4675 no, try next. jsr flush2 clean it out... bcs L46B6 return flush errors. jsr close2 update fcb & vcb ldy #$01 lda (A3L),y beq L4675 no error if close all. bcs L46B6 close error. L4675 lda fcbptr inc pointer to next fcb clc adc #$20 bcc L4654 branch if within same page. lda cferr on final close report logged errors. beq L46B4 branch if errors. rts (carry already set). L4683 jsr flush1 flush file 1st (including updating bcs L46B6 bitmap). branch if errors. close2 .EQ *-ofsX ldy fcbptr lda fcbbuf+11,y release file buffer jsr relbuffr bcs L46B6 lda #$00 ldy fcbptr sta fcbbuf,y free fcb too lda fcbbuf+1,y sta devnum go look for associated vcb jsr fnddvcb ldx vcbptr get vcb pointer. dec vcbbuf+30,x indicate one less file open. bne L46B4 branch if that wasn't the last... lda vcbbuf+17,x and #$7F strip 'files open' bit sta vcbbuf+17,x L46B4 clc rts L46B6 bcs L46E6 don't report close all error now. * flush command flushf .EQ *-ofsX ldy #$01 flush all ? lda (A3L),y bne L46E9 no, just one of them. sta cferr clear global flush error. lda #$00 start at the beginning. L46C3 sta fcbptr save current low byte of pointer. tay index to ref #. lda fcbbuf,y is this reference file open ? beq L46D1 no, try next. jsr flush2 clean it out... bcs L46E6 return anty errors. L46D1 lda fcbptr inc pointer to next fcb. clc adc #$20 bcc L46C3 branch if within same page L46D9 clc lda cferr on last flush, beq L46E0 branch if no logged errors. sec report error now L46E0 rts flush2 .EQ *-ofsX jsr fndfcbuf must set up vcb & buffer locations 1st. bcc L46F1 branch if no error. L46E6 jmp glberr error so check for close or flush all. flush1 .EQ *-ofsX for normal refnum flush, L46E9 stz cferr clear global error. jsr findfcb setup pointer to fcb user references. bcs L46E6 return any errors. L46F1 lda fcbbuf+9,y test to see if file is modified. and #$02 is it write enabled ? beq L46D9 branch if 'read only' lda fcbbuf+28,y has eof been modified ? bmi L4704 if yes. jsr gfcbstat has data been modified ? and #$70 (was written to while it's been open?) beq L46D9 if not. L4704 jsr gfcbstat and #$40 does current data buffer need to be beq L4710 written ? branch if not. jsr wfcbdat if so, go write it. bcs L46E6 if error. L4710 jsr gfcbstat check to see if the index block (tree and #$80 files only) needs to be written. beq L471C branch if not. jsr wfcbidx bcs L46E6 return any errors. L471C lda #$06 prepare to update directory tax ora fcbptr tay L4723 lda fcbbuf,y note: this code depends on the defined sta d_dev-1,x order of the file control block and the dey temporary directory area in 'work space' dex bne L4723 sta devnum lda d_head read the directory header for this file ldx d_head+1 jsr rdblk into the general purpose buffer. bcs L46E6 if error. jsr movhed0 move header info. lda d_entblk get address of directory block that ldy d_entblk+1 contains the file entry. cmp d_head test to see if it's the same block the bne L474E header is in. branch if not. cpy d_head+1 beq L4755 branch if header block = entry block L474E sta bloknml sty bloknml+1 jsr rdgbuf get block with file entry in general L4755 jsr entcalc buffer. set up pointer to entry. jsr moventry move entry to temp entry buffer in ldy fcbptr 'work space'. update 'blocks used' count lda fcbbuf+24,y sta d_usage lda fcbbuf+25,y sta d_usage+1 ldx #$00 and move in end of file mark whether L476C lda fcbbuf+21,y needed or not. sta d_eof,x inx cpx #$03 move all 3 bytes beq L4780 lda fcbbuf+12,y also move in the address of the file's sta d_filid,x first block since it might have changed iny since the file first opened. bne L476C branch always. L4780 lda fcbbuf+5,y the last thing to update is storage asl a type (y=fcbptr+2). shift into high asl a nibble. asl a asl a sta scrtch lda d_stor get old type byte (might be the same). and #$0F strip off old type, ora scrtch add in the new type sta d_stor and put it away. jsr drevise go update directory. bcs L47B4 error. ldy fcbptr mark lda fcbbuf+28,y fcb/directory and #$7F as sta fcbbuf+28,y undirty. lda d_dev see if bitmap should be written. cmp bmadev is it in same as current file ? bne L47B2 yes, put it on the disk if necessary. jsr upbmap go put it away. bcs L47B4 flush error L47B2 clc rts * report error only if not a close all or flush all glberr .EQ *-ofsX L47B4 ldy #$01 pha lda (A3L),y bne L47C1 not an 'all' so report now clc pla sta cferr save for later rts L47C1 pla rts gfcbstat .EQ *-ofsX ldy fcbptr index to fcb. lda fcbbuf+8,y return status byte. rts L47CA lda #$4E access error sec L47CD rts seteof .EQ *-ofsX can only move end of tree, sapling jsr gfcbstyp or seed. cmp #$04 tree type ? bcs L47CA if not then access error asl a asl a asl a asl a sta stortyp may be used later. lda fcbbuf+9,y and #$02 is write enabled to set new eof ? beq L47CA no, access error. jsr tstwprot hardware write protected ? bcs L47CA yes, access error. ldy fcbptr save old eof so it can be seen iny whether blocks need to be released iny upon contraction. ldx #$02 all 3 bytes of the eof L47EF lda fcbbuf+21,y sta oldeof,x dey dex bpl L47EF ldy #$04 ldx #$02 L47FD lda (A3L),y position mark to new eof sta tposll,x dey dex bpl L47FD ldx #$02 point to 3rd byte. L4808 lda oldeof,x see if eof moved backwards so blocks cmp tposll,x can be released. bcc L4815 (branch if not) bne purge branch if blocks to be released dex bpl L4808 all 3 bytes eofset .EQ *-ofsX L4815 ldy #$04 ldx fcbptr place new end of file into fcb inx inx L481C lda (A3L),y sta fcbbuf+21,x dex dey cpy #$02 all 3 bytes moved ? bcs L481C no. jmp fcbused mark fcb as dirty. purge jsr flush1 make sure file is current bcs L47CD ldx datptr+1 pointer to index block inx inx stx zpt+1 (zero page conflict with dir buf ptr) ldx datptr stx zpt ldy fcbptr check if eof < mark iny iny ldx #$02 L4840 lda fcbbuf+18,y cmp tposll,x compare until not equal or carry clear. bcc L485F branch if eof > mark. bne L484E branch if eof < mark. dey dex bpl L4840 compare all 3 bytes L484E ldy fcbptr ldx #$00 L4853 lda tposll,x fake position, correct position will sta fcbbuf+18,y be made below... iny inx cpx #$03 move all 3 bytes bne L4853 L485F jsr tkfrecnt force free block count before releasing lda tposll blocks. prepare for purge of excess... sta dseed all blocks and bytes beyond new eof lda tposlh must be zero'd sta dsap and #$01 sta dseed+1 lda tposhi lsr a sta dtree ror dsap pass position in terms of block & bytes. lda dseed now adjust for boundaries of $200 ora dseed+1 bne L48A2 branch if no adjustment necessary. lda dsap get correct block ositions for sap sec and tree levels. sbc #$01 sta dsap deallocate for last (phantom) block lda #$02 and don't modify last data block. bcs L489F branch if tree level unaffected. dec dtree bpl L489F branch if new eof not zero lda #$00 sta dtree otherwise, make a null seed out of it. sta dsap L489F sta dseed+1 L48A2 ldy fcbptr also must pass file's 1st block address. lda fcbbuf+12,y sta firstbl lda fcbbuf+13,y sta firstbh stz deblock lastly, initialize # of blocks to stz deblock+1 be free'd. jsr detree deallocate blocks from tree. php save any error status until fcb pha is cleaned up. sec ldy fcbptr ldx #$00 L48C2 lda firstbl,x sta fcbbuf+12,y move in possible new first file block lda fcbbuf+24,y address. adjust usage count also sbc deblock,x sta fcbbuf+24,y iny inx txa and #$01 test for both bytes adjusted bne L48C2 without disturbing carry. lda stortyp get possibly modified storage type lsr a lsr a lsr a lsr a ldy fcbptr and save it in fcb. sta fcbbuf+7,y jsr clrstats make it look as though position has jsr dvcbrev nothing allocated, update total blocks ldy fcbptr in fcb and correct position. iny iny ldx #$02 L48F2 lda fcbbuf+18,y tell 'rdposn' to go to correct sta tposll,x eor #$80 position from incorrect place. sta fcbbuf+18,y dey dex bpl L48F2 jsr rdposn go to correct position. bcc L490D if no error. tax otherwise, report latest error. pla plp txa restore latest error code to stack sec php pha save new error. * mark file as in need of a flush and update fcb with new end of file, * then flush it. L490D jsr eofset go mark and update jsr flush1 then go do the flush. bcc L491C branch if no error. tax save latest error. pla clean previous error off stack plp txa and restore latest error to stack. sec show error condition. php restore error status to stack pha and the error code. L491C pla report any errors that may have plp appeared. rts geteof .EQ *-ofsX ldx fcbptr index to end of file mark ldy #$02 and index to user's call parameters L4924 lda fcbbuf+21,x sta (A3L),y inx iny cpy #$05 bne L4924 loop until all 3 bytes moved clc no errors rts newline .EQ *-ofsX ldy #$02 adjust newline status for open file. lda (A3L),y on or off ? ldx fcbptr it will be 0 if off. sta fcbbuf+31,x set new line mask iny lda (A3L),y and move in 'new-line' byte sta fcbbuf+10,x clc no error possible rts getinfo .EQ *-ofsX jsr findfile look for file. bcc L4988 no error. cmp #$40 was it a root directory file ? sec (in case of no match) bne L49A4 if not, then error. lda #$F0 sta d_stor for get info, report proper storage stz reql type. forca a count of free blocks. stz reqh ldx vcbptr jsr tkfrecnt get a fresh count of free blocks on ldx vcbptr this volume. lda vcbbuf+21,x return total blocks and total in use. sta reqh 1st transfer 'free' blocks to zpage lda vcbbuf+20,x for later subtraction to determine sta reql the 'used' count. lda vcbbuf+19,x transfer to 'd.' table as aux id sta d_auxid+1 (total block count is considered aux id pha for the volume) lda vcbbuf+18,x sta d_auxid sec subtract and report the number of sbc reql blocks 'in use' sta d_usage pla sbc reqh sta d_usage+1 L4988 lda d_stor transfer bytes from internal order to lsr a call spec via 'inftabl' translation lsr a table but first change storage type to lsr a external (low nibble) format. lsr a sta d_stor ldy #$11 index to last of user's spec table. L4994 lda inftabl-3,y and #$7F strip bit used by setinfo tax lda d_stor,x move directory info to call spec. table sta (A3L),y dey cpy #$03 bcs L4994 if all info bytes moved, retn carry clr L49A4 rts setinfo .EQ *-ofsX jsr findfile get the file to work on. bcs L49CF if error. lda bubit see if backup bit can be cleared eor #$20 and d_attr and #$20 sta bkbitflg or preserve current... ldy #$0D init pointer to user supplied list. L49B9 ldx inftabl-3,y get index to corresponding 'd.' table. bmi L49C3 branch if parameter can't be set. lda (A3L),y sta d_stor,x L49C3 dey has user's request been satisfied ? cpy #$03 bcs L49B9 no, move next byte. and #$18 make sure no illegal access bits were beq L49D0 set !! branch if legal access. lda #$4E otherwise, access error. sec L49CF rts L49D0 ldy #$0B lda (A3L),y was clock null input ? beq L49D9 if yes. jmp drevise1 end by updating directory. L49D9 jmp drevise update with clock also... rename .EQ *-ofsX jsr lookfile look for source (original) file. bcc L4A1E if found. cmp #$40 trying to rename a volume ? bne L49FD no, return error. jsr renpath syntax new name. bcs L49FD rename error. ldy pathbuf find out if only rootname for new name iny lda pathbuf,y must be $FF if volume name only. bne L4A72 if not single name ldx vcbptr check for open files before changing. lda vcbbuf+17,x bpl L49FF if volume not busy. lda #$50 file busy error. L49FD sec rts L49FF ldy #$00 get newname's length lda pathbuf,y ora #$F0 (root file storage type) jsr mvrotnam update root directory. bcs L4A74 rename error. ldy #$00 ldx vcbptr update vcb also. L4A10 lda pathbuf,y move new name to vcb. beq L4A1C sta vcbbuf,x iny next character inx bne L4A10 always. L4A1C clc no errors rts L4A1E jsr getnamptr set y = 1st char of path, x = 0. L4A21 lda pathbuf,y move original name to gbuf sta gbuf,x for later comparison to new name. bmi L4A2D if last character has been moved iny otherwise, get the next one. inx bne L4A21 always. L4A2D jsr renpath get new name syntaxed. bcs L4A74 rename error. jsr getnamptr set y = path, x = 0. lda pathbuf,y now compare new name with old name L4A38 cmp gbuf,x to make sure they are in the same dir. php save result of comparison. and #$F0 was last char really a count ? bne L4A46 if not. sty rnptr save pointer to next name, it might stx namptr be the last. L4A46 plp result of last comparison ? bne L4A52 branch if different character or count. inx bump pointers. iny lda pathbuf,y was it the last character ? bne L4A38 if not. clc no operation, names were the same. rts L4A52 ldy rnptr index to last name in the chain. lda pathbuf,y get last name length. sec adc rnptr tay lda pathbuf,y this byte should be $00 ! bne L4A72 if not, bad path error. ldx namptr index to last of original name lda gbuf,x sec adc namptr tax lda gbuf,x this byte should also be $00. beq L4A76 if so, continue processing. L4A72 lda #$40 bad pathname error. L4A74 sec rts L4A76 jsr lookfile test for duplicate file name. bcs L4A7F branch if file not found, which is ok !! lda #$47 duplicate name error. sec rts L4A7F cmp #$46 was it a valid file not found ? bne L4A74 no, rename error. jsr setpath syntax pathname of file to be changed. jsr findfile get all the info on this file. bcs L4A74 rename error. jsr tstopen is file in use ? lda #$50 anticipate file busy error. bcs L4A74 error if in use. lda d_attr test bit which allows rename. and #$40 bne L4A9D branch if ok to rename lda #$4E otherwise, illegal access. L4A9B sec rts L4A9D lda d_stor find out which storage type. and #$F0 strip off name length. cmp #$D0 is it a directory ? beq L4AAE then ok. cmp #$40 is it a seed, sapling or tree ? bcc L4AAE then ok. lda #$4A file incompatible error. bne L4A9B always. L4AAE jsr renpath since both names go into the directory, bcs L4A74 syntax the new name to get the local ldy rnptr name address. y = index to local name ldx pathbuf,y length. adj y to last char of new name. tya adc pathbuf,y tay L4ABE lda pathbuf,y move local name to dir entry workspace. sta d_stor,x dey dex bne L4ABE lda d_stor preserve file storage type. and #$F0 strip off old name length. tax ora pathbuf,y add in new name's length. sta d_stor cpx #$D0 that file must be changed also. bne L4AF0 branch if not directory type. lda d_frst read in 1st header block of subdir ldx d_frst+1 jsr rdblk bcs L4A74 errors. ldy rnptr change the header's name to match the lda pathbuf,y owner's new name. get local name length. ora #$E0 assume it's a header. jsr mvrotnam bcs L4A74 L4AF0 jmp drevise1 end by updating all path directories. mvrotnam .EQ *-ofsX ldx #$00 L4AF5 sta gbuf+4,x inx iny lda pathbuf,y bne L4AF5 jmp wrtgbuf write changed header block. renpath .EQ *-ofsX ldy #$03 get address to new pathname lda (A3L),y iny sta zpt lda (A3L),y set up for syntaxing routine (synpath) sta zpt+1 jmp synpath do syntax (returns y = local namelength) getnamptr .EQ *-ofsX ldy #$00 return pointer to 1st name of path. bit prfxflg is this a prefixed name ? bmi L4B1A branch if not. ldy newpfxptr L4B1A ldx #$00 rts destroy .EQ *-ofsX jsr findfile look for file to be destroyed. bcs L4B66 if error. jsr tstopen is it open ? lda totent bne L4B64 error if open. stz reql force proper free count in volume. stz reqh (no disk access occurs if already jsr tstfrblk proper) bcc L4B39 no errors. cmp #$48 was error a full disk ? bne L4B66 no, report error. L4B39 lda d_attr make sure ok to destroy file. and #$80 bne L4B45 branch if ok to destroy. lda #$4E access error jsr p8errv (returns to caller) L4B45 lda devnum last device used. jsr twrprot1 test for write protected hardware bcs L4B66 before going thru deallocation. lda d_frst 'detree' needs first block address sta firstbl lda d_frst+1 sta firstbh lda d_stor find out which storage type. and #$F0 strip off name length. cmp #$40 is it a seed, sapling or tree ? bcc L4B68 branch if it is. bra L4BCF otherwise, test for directory destroy. L4B64 lda #$50 file busy error. L4B66 sec can't be destroyed rts L4B68 sta stortyp destroy a tree file. save storage type. ldx #$05 lda #$00 set 'detree' input variables, must be L4B6F sta stortyp,x in order: deblock, dtree, dsap, dseed. dex bne L4B6F loop until all zero'd. lda #$02 this avoids an extra file i/o and pre- sta dseed+1 vents destruction of any deleted data. inc delflag don't allow detree to zero index blocks. jsr detree make trees and saplings into seeds. dec delflag reset flag. bcs L4B93 (de-evolution) L4B85 ldx firstbh lda firstbl now deallocate seed. jsr dealloc bcs L4B93 jsr upbmap L4B93 pha save possible error code. lda #$00 update directory to free entry space. sta d_stor cmp h_fcnt file entry wrap ? bne L4BA1 branch if no carry adjustment. dec h_fcnt+1 take carry from hi byte of file entries. L4BA1 dec h_fcnt mark header with one less file. jsr dvcbrev go update block count in vcb (ignore jsr drevise error, if any) and update dir last. tax save possible new error code, pla restore possible old error code. bcc L4BAF branch if last call succeeded. txa last call failed, use it's error code. L4BAF cmp #$01 adjust carry accordingly rts dvcbrev .EQ *-ofsX update block free count in vcb. ldy vcbptr point to vcb of correct device. lda deblock get # of blocks recently freed. adc vcbbuf+20,y sta vcbbuf+20,y update current free block count. lda deblock+1 adc vcbbuf+21,y sta vcbbuf+21,y lda #$00 force re-scan from 1st bitmap sta vcbbuf+28,y rts L4BCD bcc L4B85 branch widened (always taken) L4BCF cmp #$D0 is this a directory file ? bne L4C1B no, file incompatible. jsr fndbmap make sure a buffer available for bitmap bcs L4C1A if error. lda d_frst read 1st block of directory into gbuf sta bloknml lda d_frst+1 sta bloknml+1 jsr rdgbuf bcs L4C1A lda gbuf+37 do any files exist in this directory ? bne L4BF1 if so, access error. lda gbuf+38 beq L4BF6 L4BF1 lda #$4E access error. jsr p8errv P8 error vector L4BF6 sta gbuf+4 make it an invalid subdirectory jsr wrtgbuf bcs L4C1A L4BFE lda gbuf+2 get forward link. cmp #$01 test for null block into carry. ldx gbuf+3 get the rest of the block address. bne L4C0A branch if not null. bcc L4BCD was the low part null as well ? L4C0A jsr dealloc free this block. bcs L4C1A lda gbuf+2 ldx gbuf+3 jsr rdblk bcc L4BFE loop until all freed L4C1A rts L4C1B lda #$4A file incompatible jsr p8errv (returns to caller) fcbused .EQ *-ofsX mark fcb as dirty so the directory pha will be flushed on 'flush'. tya save regs. pha ldy fcbptr lda fcbbuf+28,y fetch current fcb dirty byte. ora #$80 mark fcb as dirty. sta fcbbuf+28,y save it back pla and restore regs. tay pla rts * 'detree' deallocates blocks from tree files. it is assumed that the device has * been pre-selected and the 'gbuf' may be used. * * on entry: * stortype = storage type in upper nibble, lower nibble is undisturbed. * firstbl & firstbh = first block of file (index or data). * deblock = 0 * dtree = ptr to 1st block with data to be deallocated at tree level. * dsap = ptr to 1st block at sapling level. * dseed = byte (0-511) position to be zeroed from (inclusive). * * on exit: * stortype = modified result of storage type (if applicable). * firstbl & h = modified if storage type changed. * deblock = total number of blocks freed at all levels. * dtree, dsap, deseed unchanged. * * to trim a tree to a seed file, both dtree and dsap must be zero. * to go from tree to sapling, dtree alone must be zero. detree .EQ *-ofsX lda stortyp which kind of tree ? cmp #$20 is it a 'seed' ? bcc L4C46 if yes. cmp #$30 a sapling ? bcc L4C51 if yes. cmp #$40 is it at least a 'tree' ? bcc L4C59 branch if it is. lda #$0C block allocation error. jsr sysdeath P8 system death vector * seedling file type - make sure first desireable block is the only * block available in a seedling file. L4C46 lda dsap ora dtree bne L4CC2 jmp seedel0 * sapling file type - make sure first desireable block is within the range of * blocks available in a sapling file L4C51 lda dtree can't have any blocks in this range bne L4CC2 if so then done jmp sapdel0 else go deallocate L4C59 lda #$80 sta topdest for tree top start at end, work backwards. L4C5E jsr drdfrst read specified first block into gbuf. bcs L4CC2 return errors. ldy topdest get current pointer to top indexes. cpy dtree have enough sapling indexes been beq L4CC3 deallocated? yes, now deallocate blocks ldx #$07 buffer up to 8 sapling index block L4C6D lda gbuf,y addresses. fetch low block address sta dealbufl,x and save it. ora gbuf+$100,y is it a real block that is allocated? beq L4C81 branch if phantom block. lda gbuf+$100,y fetch high block address sta dealbufh,x and save it. dex decrement and test for dealc buf filled. bmi L4C93 branch if 8 addresses fetched. L4C81 dey look for end of deallocation limit. cpy dtree is this the last position on tree level? bne L4C6D if not. iny lda #$00 fill rest of dealc buffer with null addresses. L4C8A sta dealbufl,x sta dealbufh,x dex bpl L4C8A L4C93 dey decrement to prepare for next time. sty topdest save index. ldx #$07 L4C99 stx dtmpx save index to dealc buf. lda dealbufl,x sta bloknml ora dealbufh,x finished ? beq L4C5E branch if done with this level. lda dealbufh,x complete address with high byte, sta bloknml+1 jsr rdgbuf read sapling level into gbuf. bcs L4CC2 return errors. jsr dealblk go free all data indexes in this block bcs L4CC2 jsr wrtgbuf write the flipped index block bcs L4CC2 ldx dtmpx restore index to dealc buff. dex are there more to free? bpl L4C99 branch if so. bmi L4C5E branch always to get up to 8 more L4CC2 rts sapling block numbers. L4CC3 ldy dtree deallocate all sapling blocks greater iny than specified block. jsr dalblk1 (master index in gbuf) bcs L4CC2 if errors. jsr wrtgbuf write updated master index back to disk. bcs L4CC2 ldy dtree figure out if tree can become sapling. beq L4CEB branch if it can. lda gbuf,y otherwise, continue with partial. sta bloknml deallocation of last sapling index. ora gbuf+$100,y is there such a sapling index block ? beq L4CC2 all done if not. lda gbuf+$100,y read in sapling level to be modified. sta bloknml+1 jsr rdgbuf read highest sapling index into gbuf. bcc L4CF5 rts L4CEB jsr shrink shrink tree to sapling bcs L4CC2 sapdel0 .EQ *-ofsX jsr drdfrst read specified sapling level index bcs L4CC2 into gbuf. branch if error. L4CF5 ldy dsap pointer to last of desirable indexes. iny inc to 1st undesirable. beq L4D05 branch if all are desirable. jsr dalblk1 deallocate all indexes above specified. bcs L4CC2 jsr wrtgbuf write out the index block bcs L4CC2 L4D05 ldy dsap prepare to clean up last data block. beq L4D1F branch if possibility of making a seed. L4D0A lda gbuf,y fetch low order data block address. sta bloknml ora gbuf+$100,y is it a real block ? beq L4CC2 if not, then done. lda gbuf+$100,y sta bloknml+1 jsr rdgbuf go read data block into gbuf. bcc L4D2E branch if good read rts or return error. L4D1F lda dtree are both tree and sap levels zero ? bne L4D0A if not. jsr shrink reduce this sap to a seed. bcs L4D52 if error. seedel0 .EQ *-ofsX jsr drdfrst go read data block. bcs L4D52 if error. L4D2E ldy dseed+1 check high byte for no deletion. beq L4D39 branch if all of 2nd page to be deleted. dey if dseed > $200 then all were done. bne L4D52 branch if that is the case. ldy dseed clear only bytes >= dseed. L4D39 lda #$00 L4D3B sta gbuf+$100,y zero out unwanted data iny bne L4D3B ldy dseed+1 is that all ? bne L4D4F yes. ldy dseed L4D49 sta gbuf,y iny bne L4D49 L4D4F jmp wrtgbuf update data block to disk. L4D52 rts return error status. drdfrst .EQ *-ofsX read specified 1st block into gbuf lda firstbl ldx firstbh jmp rdblk go read it * beware that dealloc may bring in a new bitmap block and may destroy * locations 46 and 47 which are used to point to the current index block. shrink .EQ *-ofsX ldx firstbh first deallocate top index block txa pha lda firstbl pha save block address of this index block. jsr dealloc free it from the bitmap pla sta bloknml set master of sapling pla index block address. sta bloknml+1 bcs L4D8D report errors. lda gbuf get # of new 1st block from old index. sta firstbl lda gbuf+$100 sta firstbh ldy #$00 jsr swapme flip that one entry in old top index. sec now change file type, lda stortyp from tree to sapling, sbc #$10 or from sapling to seed. sta stortyp jsr wrtgbuf write the (deallocated) old top index. L4D8D rts return error status. dealblk .EQ *-ofsX ldy #$00 start at beginning. dalblk1 .EQ *-ofsX lda bloknml save disk address of gbuf's data. pha lda bloknml+1 pha L4D96 sty saptr save current index. lda gbuf,y get low address of block to deallocate. cmp #$01 test for null block into carry. ldx gbuf+$100,y get remainder of block address. bne L4DA5 branch if not null. bcc L4DB0 was the low part null too ? L4DA5 jsr dealloc free it up on volume bitmap. bcs L4DB4 return any error. ldy saptr get index to sapling level index block. jsr swapme L4DB0 iny next block address. bne L4D96 if more to deallocate or test. clc no error. L4DB4 tax save error code, if any. pla restore blocknm (16 bit) sta bloknml+1 pla sta bloknml txa restore return code rts swapme .EQ *-ofsX lda delflag swapping or zeroing ? bne L4DC5 skip if swapping. tax make x = 0. beq L4DCB zero the index (always taken). L4DC5 ldx gbuf+$100,y index high lda gbuf,y index low L4DCB sta gbuf+$100,y save index high txa sta gbuf,y save index low rts done. * MEMMGR memory manager * * allocate buffer in memory tables alcbuffr .EQ *-ofsX ldy #$04 index to user specified buffer. alcbufr1 .EQ *-ofsX lda (A3L),y this buffer must be on a page boundary. tax save for validation. cmp #$08 bcc L4E1E cannot be lower than video ! cmp #$BC nor greater than $BB00 bcs L4E1E since it would wipe out globals... sta datptr+1 dey lda (A3L),y low address should be zero ! sta datptr bne L4E1E error if not page boundary. inx add 4 pages for 1k buffer. inx inx inx L4DED dex test for conflicts. jsr cmembit test for free buffer space and memmap,y P8 memory bitmap bne L4E1E report memory conflict, if any. cpx datptr+1 test all 4 pages. bne L4DED inx add 4 pages again for allocation. inx inx inx L4DFE dex set proper bits to 1 jsr cmembit ora memmap,y to mark it's allocation. sta memmap,y cpx datptr+1 set all 4 pages bne L4DFE ldy fcbptr calculate buffer number lda fcbbuf,y asl a buffer number = (entnum) * 2. sta fcbbuf+11,y save it in fcb. tax use entnum * 2 as index to global lda datptr+1 buffer addr tables. get addr already sta buftbl-1,x validated as good. store hi addr clc (entnums start at 1, not 0) rts L4E1E lda #$56 buffer is in use or not legal sec rts getbufadr .EQ *-ofsX tax index into global buffer table. lda buftbl-2,x sta bufaddrl lda buftbl-1,x sta bufaddrh rts relbuffr .EQ *-ofsX preserve buffer address in 'bufaddr' jsr getbufadr tay returns high buffer address in acc. beq L4E54 branch if unallocated buffer space. stz buftbl-1,x take address out of buffer list. stz buftbl-2,x (x was set up by getbufadr) freebuf .EQ *-ofsX ldx bufaddrh get hi buffer address inx add 4 pages to account for 1k space. inx inx inx L4E43 dex drop to next lower page. jsr cmembit get bit and position to memtable of eor #$FF this page. invert mask. and memmap,y mark address as free space. sta memmap,y cpx bufaddrh all pages freed ? bne L4E43 no. L4E54 clc no error. rts * calculate memory allocation bit position. * on entry: x = high address of buffer, low address assumed zero. * on exit: acc = allocation bit mask, x = unchanged, y = pointer to memtabl byte cmembit .EQ *-ofsX txa page address and #$07 which page in any 2k set ? tay use as index to determine lda whichbit,y bit position representation. pha save bit position mask for now. txa page address. lsr a lsr a determine 2k set lsr a tay return it in y. pla restore bit mask. return bit position rts in a & y, pointer to memtabl in x. valdbuf .EQ *-ofsX lda usrbuf+1 high address of user's buffer cmp #$02 must be greater than page 2. bcc L4E1E report bad buffer ldx cbytes+1 lda cbytes get cbytes-1 value. sbc #$01 (carry is set) bcs L4E76 dex L4E76 clc adc usrbuf calculate end of request address. txa do high address. adc usrbuf+1 the final address tax must be less than $BFnn (globals) cpx #$BF bcs L4E1E report bad buffer. inx loop thru all affected pages. vldbuf1 .EQ *-ofsX L4E82 dex check next lower page. jsr cmembit and memmap,y if 0 then no conflict. bne L4E1E branch if conflict. cpx usrbuf+1 was that the last (lowest) page ? bne L4E82 if not. clc all pages ok. rts getbuf .EQ *-ofsX give user address of file buffer ldy #$02 referenced by refnum. lda bufaddrl sta (A3L),y iny lda bufaddrh sta (A3L),y clc no errors possible rts setbuf .EQ *-ofsX ldy #$03 jsr alcbufr1 allocate new buffer address over old one bcs L4EC7 report any errors immediately lda bufaddrh sta usrbuf+1 lda bufaddrl sta usrbuf jsr freebuf free address space of old buffer ldy #$00 ldx #$03 L4EB8 lda (usrbuf),y move all 4 pages of the buffer to sta (datptr),y new location. iny bne L4EB8 inc datptr+1 inc usrbuf+1 dex bpl L4EB8 clc no errors L4EC7 rts * move 3 pages of dispatcher from 'displc2' to 'dispadr' * this move routine must be resident above $E000 at all times calldisp .EQ *-ofsX lda altram read/write RAM bank 2 lda altram lda #>dispadr sta A2L+1 lda #displc2 sta A1L+1 stz A1L ldy #$00 ldx #$03 3 pages to move. L4EE0 dey move a page of code. lda (A1L),y sta (A2L),y tya bne L4EE0 inc A1L+1 pointers to next page inc A2L+1 dex move all pages needed bne L4EE0 lda ramin read/write RAM bank 1 lda ramin swap mli space back in stz mliact MLI active flag stz softev lda #>dispadr point RESET to dispatch entry sta softev+1 eor #$A5 sta pwredup power up byte jmp dispadr * translate a prodos call into a smartport call * to access unseen smartport devices remap_sp .EQ *-ofsX ldx #$03 assume 3 parameters. lda A4L command number sta cmdnum bne L4F1B taken if not status call ldy #spstatlist sty buf+1 stz bloknml set statcode = 0 for simple status call L4F1B cmp #$03 format command ? bne L4F21 no. ldx #$01 format has only 1 parameter. L4F21 stx statparms set # of parms. lda unitnum lsr a turn unit number into an index lsr a lsr a lsr a tax lda spunit-1,x get the smartport unit number and sta sp_unitnum store into smartport parm list. lda spvectlo-1,x sta sp_vector+1 copy smartport entry address lda spvecthi-1,x sta sp_vector+2 ldx #$04 copy buffer pointer and block # L4F3F lda buf-1,x from prodos parameters sta sp_bufptr-1,x to smartport parameter block dex bne L4F3F sp_vector .EQ *-ofsX smartport call jsr $0000 (entry address gets modified) cmdnum .EQ *-ofsX dc h'00' command # dc i2'statparms' bcs L4F6E ldx cmdnum status call ? bne L4F6E no... ldx spstatlist+1 else get the block count ldy spstatlist+2 lda spstatlist get the returned status. bit #$10 is there a disk present ? bne L4F65 yes, check for write protected. lda #$2F return offline error. bra L4F6D L4F65 and #$44 mask all but write allowed and write eor #$40 protected bits. if allowed and not beq L4F6E protected, exit with carry clear lda #$2B else return write protected error. L4F6D sec L4F6E rts spvectlo .EQ *-ofsX storage for low byte of smartport .DA #0000000000000000' entry. .DA #00000000000000' spvecthi .EQ *-ofsX storage for high byte of smartport .DA #0000000000000000' entry. .DA #00000000000000' statparms .EQ *-ofsX # of parms (always 3 except format) dc h'03' sp_unitnum .EQ *-ofsX .DA #00' unit number sp_bufptr .EQ *-ofsX dc h'0000' data buffer dc h'000000' block number (3 bytes) * data tables scnums .EQ *-ofsX table of valid mli command numbers. dc h'D3000000' .DA #40410000808182' .DA #65C0C1C2C3C4C5C6' .DA #C7C8C9CACBCCCDCE' .DA #CF00D0D1D2' pcntbl .EQ *-ofsX parameter counts for the calls dc h'02FFFF' .DA #FF0201FFFF030300' .DA #04070102070A0201' .DA #0103030404010102' .DA #02FF020202' * command table cmdtable .EQ *-ofsX dc i2'create' create dc i2'destroy' destroy .DA rename' rename dc i2'setinfo' setinfo dc i2'getinfo' getinfo dc i2'online' online .DA setprefx' set prefix dc i2'getprefx' get prefix dc i2'openf' open dc i2'newline' newline .DA readf' read dc i2'writef' write dc i2'closef' close dc i2'flushf' flush .DA setmark' set mark dc i2'getmark' get mark dc i2'seteof' seteof dc i2'geteof' geteof .DA setbuf' setbuf dc i2'getbuf' getbuf * corresponding command function bytes disptch .EQ *-ofsX dc h'A0A1A2A3' .DA #84050607' dc h'88494A4B' .DA #2C2D4E4F' .DA #50515253' dinctbl .EQ *-ofsX table to increment dc h'0100000200' directory usage/eof counts pass .EQ *-ofsX dc h'75' xdosver .EQ *-ofsX dc h'00' compat .EQ *-ofsX dc h'00' dc h'C3270D000000' rootstuf .EQ *-ofsX .DA #0F02000400000800' whichbit .EQ *-ofsX .DA #8040201008040201' ofcbtbl .EQ *-ofsX .DA #0C0D1819151617' inftabl .EQ *-ofsX .DA #1E101F2080939421' .DA #22232418191A1B' deathmsg .EQ *-ofsX dc h'20' msb on dc c'RESTART SYSTEM-$01' dc h'20' *** work space *** * note: this area is accessed by code that depends on the order of these * variables in the file control block and temporary directory. own_blk .EQ *-ofsX .DA #0000' own_ent .EQ *-ofsX dc h'00' own_len .EQ *-ofsX dc h'00' h_credt .EQ *-ofsX dc h'0000' directory creation date dc h'0000' directory creation time .DA #00' version under which this dir created dc h'00' earliest version that it's compatible h_attr .EQ *-ofsX attributes (protect bit, etc.) dc h'00' h_entln .EQ *-ofsX length of each entry in this directory dc h'00' h_maxent .EQ *-ofsX maximum number of entries per block dc h'00' h_fcnt .EQ *-ofsX current # of files in this directory dc h'0000' h_bmap .EQ *-ofsX address of first allocation bitmap .DA #0000' h_tblk .EQ *-ofsX total number of blocks on this unit dc h'0000' d_dev .EQ *-ofsX device number of this directory entry dc h'00' d_head .EQ *-ofsX address of directory header dc h'0000' d_entblk .EQ *-ofsX address of block which contains entry dc h'0000' d_entnum .EQ *-ofsX entry number within block .DA #00' d_stor .EQ *-ofsX dc h'0000000000000000' file name dc h'0000000000000000' d_filid .EQ *-ofsX user's identification byte .DA #00' d_frst .EQ *-ofsX first block of file dc h'0000' d_usage .EQ *-ofsX # of blocks allocated to this file dc h'0000' d_eof .EQ *-ofsX current end of file marker dc h'000000' d_credt .EQ *-ofsX .DA #0000' file creation date dc h'0000' file creation time d_sosver .EQ *-ofsX sos version that created this file dc h'00' d_comp .EQ *-ofsX backward version compatibility dc h'00' d_attr .EQ *-ofsX attributes (protect, r/w, enable, etc.) dc h'00' d_auxid .EQ *-ofsX user auxilliary identification .DA #0000' d_moddt .EQ *-ofsX dc h'0000' file's last modification date dc h'0000' file's last modification time d_dhdr .EQ *-ofsX file directory header block address dc h'0000' scrtch .EQ *-ofsX scratch area for .DA #00000000' allocation address conversion. oldeof .EQ *-ofsX temp used in r/w dc h'000000' oldmark .EQ *-ofsX .DA #000000' xvcbptr .EQ *-ofsX used in 'cmpvcb' as a temp dc h'00' vcbptr .EQ *-ofsX dc h'00' fcbptr .EQ *-ofsX dc h'00' fcbflg .EQ *-ofsX dc h'00' reql .EQ *-ofsX dc h'00' reqh .EQ *-ofsX dc h'00' levels .EQ *-ofsX .DA #00' totent .EQ *-ofsX dc h'00' entcntl .EQ *-ofsX dc h'00' entcnth .EQ *-ofsX dc h'00' cntent .EQ *-ofsX dc h'00' nofree .EQ *-ofsX dc h'00' bmcnt .EQ *-ofsX dc h'00' saptr .EQ *-ofsX dc h'00' pathcnt .EQ *-ofsX .DA #00' p_dev .EQ *-ofsX dc h'00' p_blok .EQ *-ofsX dc h'0000' bmptr .EQ *-ofsX dc h'00' basval .EQ *-ofsX dc h'00' half .EQ *-ofsX dc h'00' * bitmap info tables bmastat .EQ *-ofsX dc h'00' bmadev .EQ *-ofsX .DA #00' bmadadr .EQ *-ofsX dc h'0000' bmacmap .EQ *-ofsX dc h'00' tposll .EQ *-ofsX dc h'00' tposlh .EQ *-ofsX dc h'00' tposhi .EQ *-ofsX dc h'00' rwreql .EQ *-ofsX dc h'00' rwreqh .EQ *-ofsX .DA #00' nlchar .EQ *-ofsX dc h'00' nlmask .EQ *-ofsX dc h'00' ioaccess .EQ *-ofsX has a call been made to dc h'00' disk device handler ? cmdtemp .EQ *-ofsX dc h'00' bkbitflg .EQ *-ofsX used to set or clear backup bit dc h'00' duplflag .EQ *-ofsX dc h'00' vcbentry .EQ *-ofsX dc h'00' * xdos temporary variables namcnt .EQ *-ofsX .DA #00' rnptr .EQ *-ofsX dc h'00' namptr .EQ *-ofsX dc h'00' vnptr .EQ *-ofsX dc h'00' prfxflg .EQ *-ofsX dc h'00' cferr .EQ *-ofsX dc h'00' * deallocation temporary variables firstbl .EQ *-ofsX dc h'00' firstbh .EQ *-ofsX dc h'00' stortyp .EQ *-ofsX .DA #00' deblock .EQ *-ofsX dc h'0000' dtree .EQ *-ofsX dc h'00' dsap .EQ *-ofsX dc h'00' dseed .EQ *-ofsX dc h'0000' topdest .EQ *-ofsX dc h'00' dtmpx .EQ *-ofsX dc h'00' loklst .EQ *-ofsX look list of recognized device numbers dealbufl .EQ *-ofsX dc h'0000000000000000' dealbufh .EQ *-ofsX .DA #0000000000000000' cbytes .EQ *-ofsX .DA #0000' dc h'00' cbytes+2 must = 0 bufaddrl .EQ *-ofsX dc h'00' bufaddrh .EQ *-ofsX dc h'00' goadr .EQ *-ofsX dc h'0000' delflag .EQ *-ofsX used by 'detree' to know if called .DA #00' from delete (destroy). * zero fill to page boundary - 3 ($FEFD). so that cortland flag stays * within page boundary. dc h'00000000000000' dc h'0000000000' dc i2'calldisp' cortflag .EQ *-ofsX cortland flag. 1 = Cortland system dc h'00' (must stay within page boundary) * end of obj mli_2 *-------------------------------------- MAN LOAD USR/SRC/PRODOS.203/PRODOS.S.XDOS SAVE USR/SRC/PRODOS.203/PRODOS.S ASM