*::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::* * * * RENAME function handler * * * *----------------------------------------------------------------* * * * The RENAME function handler (FNRENAME, $AC3A) uses the * * COMNOPEN routine ($AB28) to locate the desired file. COMNOPEN * * configures the FM work area, reads in a fresh VYOC and then * * searches the directory sectors for the file description entry * * of the wanted file. (The links to the first directory sector * * are housed in the VTOC. Each subsequent directory sector * * contains the links to the next directory sector. The link * * bytes of the last directory sector are zeroed out.) * * Each directory contains up to seven different file * * descriptions. An example of the data contained in a file * * description is shown below: * * FIL1TSTK DS 1 ;Track # of first T/S list for file 1. * * FIL1TSSC DS 1 ;Sector # of first T/S list for file 1. * * FIL1TYPE DS 1 ;File type code for file 1. ($00=Text, * * ;$01=Integer, $02=Applesoft, $04=Binary, * * ;$08=S-type, $10=Relocatable, $20=A-type * * ;and $40=B-type.) The hi bit is set on * * ;locked files. For example, $02=unlocked * * ;Applesoft and $82=locked Applesoft. * * FIL1NAME DS 30 ;Name of file 1. If a file name less than * * ;30 bytes is used, trailing spaces are * * ;added to the name to fill the buffer. * * FIL1SIZE DS 2 ;Size of file 1 in terms of the number of * * ;sectors used. * *(If a file was deleted, the track # of the first T/S list sec * * was copied to the last byte position of the name field. The * * original track # byte (FIL1TSTK) was then overwritten with * * an #$FF.) * * As each directory sector is read in, an attempt is made * * to locate a file description which contains the name of the * * file wanted. If the name can't be located after seaching all * * the directories, a second search is made to locate the first * * available space in a directory sector where a new file * * description can be placed (in case the command can create a * * new file). If no free space is located, a disk-full error * * message is printed. * * If an available space is located, NEWDESCRP ($B2C1) copies * * the name of the wanted file from the primary file name buffer * * (PRIMFNBF, $AA75) into the new entry space. A check is then * * made to see if the command can legally create a new file. The * * identifying command byte (NDX2CMD, $AA5F) is used to index a * * table of command attributes (CMDATTRB, $A909). Because bit0 * * of the first attribute byte associated with the RENAME command * * is clear, a new file cannot legally be created. As a result, * * the RENAME command is exited with a file-not-found message. * * If a (non-deleted) description entry containing the name * * of the wanted file is located, execution branches to the * * FILLINWA routine ($ABA6). FILLINWA uses the information * * contained in the description entry to customize the FM work * * area. Eventhough it is not needed for the RENAME function, * * the first T/S list belonging to the wanted file is read in * * (READTS, $A5FE). Next, the file type code is checked. The * * RENAME command is aborted with a file-locked message if the hi * * bit of the file code byte is set. * * If the file is not locked, the A4L/H pointer ($42,$43) * * are loaded with the address of the rename buffer (RENAMBUF, * * $B5BD) and NEWDESCRP ($B2C1) is called to copy the new name * * from the secondary name buffer (SCNDFNBF, $AA93) to the * * name field in the file description entry. After WRDIRECT * * ($B037) is called to write the modified directory sector back * * to the disk, execution returns to the RENAME command handler. * * * *::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::* (AC3A) FNRENAME JSR COMNOPEN ;Locate a file with the same name & open it. *** NOTE *** * Not all of the common open routine is * listed below because not all of it * applies to the RENAME function. * Common open routine. (AB28) COMNOPEN JSR ZWRKAREA ;Initialize the work area. * Zero out the FM work area so it can be customized * in accordance with the calling function. * (Although some work bytes may not be subsequently * altered, don't be lulled into thinking that they * are not inportant. Zero values are just as relevant * as non-zero values.) * (P.S. Don't confuse the FM work area with its image * (FM work buffer) that is housed in the chain of * DOS buffers.) (ABDC) ZWRKAREA LDA #0 TAX ;Initialize the x-index. ZEROWRKA STA FMWKAREA,X ;Put a $00 byte in work area. INX CPX #45 ;Work area is 45 bytes long. (ABE5) BNE ZEROWRKA * Begin customizing the work area. * Get volume, drive, slot & catalog track * values from the FM parameter list. Put * drive, slot*16, catalog track and * complemented volume number in the work area. (ABE7) LDA VOLFM ;Volume number. EOR #$FF ;Calculate 1's complement of volume #. STA VOLWA LDA DRVFM ;Drive #. STA DRVWA LDA SLOTFM ;Get slot #. ASL ;Calculate slot * 16. ASL ASL ASL TAX ;Set (x) = slot * 16. STX SLOT16WA LDA #$11 ;Normal catalog trk = #17. STA TRKWA (AC05) RTS (AB2B) LDA #1 ;Describe sector length as 256 bytes (AB2D) STA SECSIZWA+1 ;(in the FM work area). * Get record length from the FM parameter * list & put it in the FM work area. * (Don't allow a zero length. If zero, * change it to one.) (AB30) LDX RECLENFM+1 LDA RECLENFM BNE STRECLEN ;Non-zero record length is ok. CPX #0 BNE STRECLEN INX ;Was zero, make it one instead. STRECLEN STA RECLENWA ;Put length in FM work area. STX RECLENWA+1 (AB43) JSR GETFNTRY ;Try to find a directory sector for the file. * Locate or create a file entry in the * directory buffer. * Make two searches if necessary: * - Search1 - try to locate entry with same name as file wanted. * - Search2 - couldn't locate entry corresponding to file * wanted so create a new entry in first available * space in the directory sector. (B1C9) GETFNTRY JSR READVTOC ;Read in the VTOC so we can get the link to ;TRKMAPS & to the first directory sector. * Read the Volume Table of Contents (VTOC). (AFF7) READVTOC LDA #1 ;Read opcode for RWTS. (AFF9) BNE RDWRVTOC ;ALWAYS. * Code common to read/write VTOC. (AFFD) RDWRVTOC LDY ADRVTOC ;Get address of VTOC from the STY IBBUFP ;FM constants table & designate it LDY ADRVTOC+1 ;as the I/O buffer in RWTS's IOB. STY IBBUFP+1 LDX TRKWA ;Enter RWTS driver with (x)/(y) equal LDY #0 ;to the trk/sec values of the VTOC. (B00E) JMP RWTSDRVR ;Call driver to read/write the VTOC. ------------ * Read/Write Track/Sector driver. (B052) RWTSDRVR . . (See dism'bly of RWTS driver using READ.) . . (RTS) * Point A4L/H at the primary file name buffer. (B1CC) LDA FNAMBUFM ;Get address of the name buffer from the STA A4L ;FM parameter list & put it in the A4L/H LDA FNAMBUFM+1 ;pointer. (B1D4) STA A4L+1 * Try to find the directory sector with the * wanted file name & read it into the directory * sector buffer. Make two searches if necessary. * On the first search, try to find a matching name. * If that doesn't work, do a second search to store * the description in the first available file * description field in a directory sector in case * the command can create a new file. (B1D6) LDA #1 ;Initialize the search counter (SCRNSRCH) SETSRCH STA SCRNSRCH ;in the FM scratch space for two searches. (B1D8) ;(1 = search1, 0 = search2) (B1DB) LDA #0 ;Initialize offset of file description from STA SECNXDIR ;the very first directory sector. CLC ;(c)=0=signal to read first directory sec. GETDIRSC INC SECNXDIR ;Kick up offset from first directory. (B1E4) JSR RDDIRECT ;Go read directory sector into buffer. * Read a directory sector. (B011) RDDIRECT PHP ;Save (c) on stack: ; (c) = 0 = read 1rst directory sector. ; (c) = 1 = read next directory sector. (B012) JSR PT2DIRBF * Designate the directory sector buffer * as I/O buffer in RWTS's IOB. (B045) PT2DIRBF LDA ADRDIRBF ;Get addr of direc STA IBBUFP ;sec buf from the LDA ADRDIRBF+1 ;FM constants tbl STA IBBUFP+1 ;& designate it as (B051) RTS ;as the I/O buffer. (B015) PLP ;Check if 1rst directory sec or not. (B016) BCS RDNXTDIR ;Go read next directory sector. * Read the first directory sector. * (Carry = 0.) (B018) RDFIRDIR LDY FIRDIRSC ;(y)/(x) = trk/sec vals of first directory LDX FIRDIRTK ;sector (from the VTOC buffer). (B01E) BNE DODIRRD ;ALWAYS - go read in directory sector. * Read the next directory sector. * (Carry = 1.) (B020) RDNXTDIR LDX DIRLNKTK ;Get track of next directory sec from the ;link in the current directory sector. (B023) BNE GETDIRLK ;Link not zeroed out. SEC ;Link zeroed out - exit with (c) = 1 to (B026) RTS ;signal there are no more directory secs. ============ (B027) GETDIRLK LDY DIRLNKSC ;Get sector of next directory sec from the ;link in the current directory sector. * Call to read in the directory sector. (B02A) DODIRRD STX CURDIRTK ;Save trk/sec vals of directory sec that (B02D) STY CURDIRSC ;we are about to read so they will be ;the current directory sec values for the ;next time around. (B030) LDA #1 ;Read opcode for RWTS. (B032) JSR RWTSDRVR ;Call RWTS driver to do the read. * Read/Write Track/Sector driver. (B052) RWTSDRVR . . (See dis'mbly of RWTS driver using READ.) . . (RTS) (B035) CLC ;Link didn't zero out so signal that there (B036) RTS ;are more directory secs to read & exit. ============ (B1E7) BCS CHNGSRCH ;Link zeroed out, no more directory secs, ;so go switch searches. (B1E9) LDX #0 CKDIRTRK STX CURDIRNX ;Offset of file description into the current (B1EB) ;directory sector. (B1EE) LDA FIL1TSTK,X ;Get track number of first T/S list sec ;for a particular file from the file ;description entry in the directory sector. (B1F1) BEQ CHRSRCHA ;If trk=0, no more files in this direc sec. (B1F3) BMI CHRSRCHB ;Skip deleted file. (When a file is ;deleted, #$FF is put in byte where trk # ;of first T/S list is usually kept. * Compare the name found in the file * description entry portion of the * directory sector with the file name * wanted. (On entry, A4L/H points at * the primary file name buffer.) (B1F5) LDY #0 ;Initialize index to file name buffer. INX ;Point (x) at the first char position INX ;in the name field of description entry. CMPNAMES INX LDA (A4L),Y ;Get char of name from primary. CMP FIL1TSTRK,X ;Compare to char in description name. BNE DONTMTCH ;Chars (and therefore names) don't match. INY CPY #30 ;Done all chars yet (0 to 29)? BNE CMPNAMES ;Chars matched, branch if more to check. LDX CURDIRNX ;All chars matched, so names matched. CLC ;Return with (x) = index to file (B20A) RTS ;description in current directory sector ============ ;and with (c) = 0 to signal that the ;correct file description was found. * Advance index to point at the next * potential file description entry. (B20B) DONTMTCH JSR NXPLUS35 ;Names didn't match, so adjust index ;to point at the next entry. * Add 35 to the offset to point the index * at the next file description entry. * (Check to make sure that we don't index * right off the end of the directory sec.) (B230) NXPLUS35 CLC LDA CURDIRNX (B234) ADC #35 ;Add 35 to index. (Each file description ;entry is 35 bytes long.) (B236) TAX ;Check if there is more space for entries CPX #245 ;in the current directory sector. (B239) RTS ;Exit with (c) conditioned: ; (c) = 0 = more space in directory. ; (c) = 1 = ran off end of directory. (B20E) BCC CKDIRTRK ;More potential file descriptions to check ;in this directory sector. (B210) BCS GETDIRSC ;Go get next directory sector. ------------ * If we just completed first search, * go back to do second search. (B212) CHRSRCHA LDY SCRNSRCH ;(1 = search1, 0 = search2) (B215) BNE SETSRCH ;Go switch to second search. * If first search, skip deleted files. * If second search, fall through to store * the description in the first unused * space in the directory. (B217) CHRSRCHB LDY SCRNSRCH ;(1 = search1, 0 = search2) (B21A) BNE DONTMTCH * Couldn't locate the named file in the * directory description entries, so begin * creating a new description in the first * available space in a directory (in case * command can legally create a new file). (B21C) NWDESCRP LDY #0 ;Initialize index to primary file name buffer. INX ;Set index to first char position in the INX ;name field of the file description entry SETNWNAM INX ;space in the directory sector. LDA (A4L),Y ;Copy char from primary file name buffer STA FIL1TSTK,X ;to the directory description space. INY CPY #30 ;30 chars in name (0 to 29). BNE SETNWNAM ;Branch if more chars to copy. LDX CURDIRNX ;Return with (x) = index to file SEC ;description space in current directory (B22F) RTS ;sector & with (c)=1 to signal new entry ============ ;was just created. * If first search, switch to second search. * If second search, link zeroed out because * there isn't enough room left on the * disk for a new entry. Therefore, * exit with a disk-full error message. (B23A) CHNGSRCH LDA #0 ;Used to reset search counter if ;go back to do start second search. (B23C) LDY SCRNSRCH ;(1 = search1, 0 = search2) BNE SETSRCH ;Just did first search, so go start second search. (B241) JMP DISKFULL ;Even second search was unsuccesful so go ------------ ;handle a disk-full error. (AB46) BCC FILLINWA ;Branch if found a directory sector with ;name wanted in the file description entry. * Named file wasn't found in directory, * so prepare a new file entry in case * command can legally create a new file. (AB48) STX CURDIRNX ;Offset to new description entry in ;case want to create a new file. * Check to see if command can * legally create a new file. (AB4B) LDX NDX2CMD ;(x) = index representing command. (AB4E) LDA CMDATTRB,X ;Get first byte containing description ;of the given command's attributes. (AB51) LDX CURDIRNX ;(x) = index for new file description ;entry into the directory sector. (AB54) LSR ;(c) = bit 0 of 1rst attribute byte. (AB55) BCS CREATNEW ;If (c) = 1, command can create a new file. ;FALL THRU FOR RENAME FUNCTION (cause (c) = 0). * Command can't create a new file. * See which language we are using and * exit with the appropriate error msg. (AB57) NEWILLGL LDA CONDNFLG ;$00=warmstart, $01=reading, $40=A(RAM), ;$80=coldstart & $C0=integer. (AB5A) CMP #$C0 ;Integer in ROM? BNE TOFILNOT ;No. (AB5E) JMP LNGNOTAV ;Yes - handle language-not-available error. ------------ TOFILNOT JMP FILENOT ;Handle file-not-found error. (AB61) ------------ *** NOTE *** * ALTHOUGH IT IS NOT NEEDED FOR THE RENAME * FUNCTION, THE T/S LIST SECTOR IS AUTOMATICALLY * READ INTO THE T/S LIST BUFFER IF THE FILE IS FOUND. * Fill in the FM work area buffer. * (Routine common to opening a new * or pre-existing file.) (ABA6) FILLINWA LDA FIL1TSTK,X ;T/S list trk val (from directory sec). STA FIRSTSTK LDA FIL1TSSC,X ;T/S list sec val (from directory sec). STA FIRTSSEC LDA FIL1TYPE,X ;File type (from directory sec). STA FILTYPFM STA FILTYPWA LDA FIL1SIZE,X ;File size (from directory sec). STA FILENSEC LDA FIL1SIZE+1,X STA FILENSEC+1 STX BYTNXDIR ;Index into directory sec to description. LDA #$FF ;Pretend that the last data sector used had a STX RELPREV ;relative sector number (in relation to (ABCF) STA RELPREV+1 ;the entire file) of #$FFFF. NOTE: This ;value is later used to trick the read and ;write subfunctions into ignoring the data ;sector currently in memory. (ABD2) LDA MXIN1TSL ;Dictate that a T/S list can only describe $7A (ABD5) STA MXSCURTS ;(#122) data sectors. Note: This value is later ;used by the read and write subfunctions to decide ;whether or not the T/S list currently in memory ;should be used. * Read first T/S list sector * to the T/S list buffer. (ABD8) CLC ;(c) = 0 = signal 1rst T/S list sector. (ABD9) JMP READTS ;Go read in the T/S list sector. ------------ * Read T/S list sector. (AF5E) READTS PHP ;Save (c) denoting if 1rst T/S list or not. ;(c) = 0 = read 1rst T/S list sec. ;(c) = 1 = read next T/S list sec. (AF5F) JSR CKTSUPDT ;Write T/S list sec buf if updating is ;required. (If T/S list buf has changed ;since last read or write, then write it ;back to the disk so don't overwrite buf ;and lose information when read the new ;T/S list sector.) * Check if T/S list requires updating. * (ie. Has T/S list buf changed since * the last read or write?) (AF34) CKTSUPDT LDA UPDATFLG (AF36) BMI WRITETS ;If bit 7 set, updating is required. ;NOT APPLICABLE TO THE RENAME FUNCTION. (AF39) RTS ============ (AF62) JSR SETTSIOB ;Prepare RWTS's IOB for READING a T/S list. * Prepare RWTS's IOB for reading * or writing the T/S list sector. (AF4B) SETTSIOB LDA TSBUFFM ;Get adr of the T/S list buf from the FM STA IBBUFP ;parameter list & designate T/S list buf LDA TSBUFFM+1 ;as the I/O buffer in RWTS's IOB. STA IBBUFP+1 LDX CURTSTRK ;Set (x)/(y) = trk/sec of current T/S list. LDY CURTSSEC (AF5D) RTS (AF65) JSR SELTSBUF ;Select the T/S list buffer. * Point A4L/H at the T/S list sector buffer. (AF0C) SELTSBUF LDX #2 ;Index for T/S list buf. (AF0E) BNE PT2FMBUF ;ALWAYS. (AF12) PT2FMBUF LDA WRKBUFFM,X ;Get address of the desired buffer from STA A4L ;the FM parameter list & put it in the LDA WRKBUFFM+1,X ;A4L/H pointer. STA A4L+1 (AF1C) RTS (AF68) PLP ;Get saved (c) back from stack. (AF69) BCS RDNXTTS ;If (c) = 1, already read first T/S list ;sec, so go read next one. ;BRANCH NOT APPLICABLE TO RENAME FUNCTION (cause (c) = 0). * Read first T/S list sector. * (Carry was clear.) (AF6B) RDFIRSTS LDX FIRSTSTK ;Set (x)/(y)=trk/sec of first T/S list sec. LDY FIRTSSEC (AF71) JMP RDTSLST ;Go read T/S list sector into buffer. ------------ * Subroutine to read/write T/S list sector. (AFB5) RDTSLST LDA #1 ;Read opcode for RWTS. * Code common to read/write T/S list. (AFB7) RDWRTS STX CURTSTRK ;New T/S list sector trk/sec values (x)/(y) STY CURTSSEC ;become current T/S list trk/sec values. (AFBD) JSR RWTSDRVR ;Call RWTS driver to read/write the ;current T/S list. * Read or write the current T/S list. (B052) RWTSDRVR . . (See dis'mbly of RWTS driver using READ or WRITE.) . . (RTS) * Update the FM work area * (not in DOS buffer chain). (AFC0) LDY #5 ;Offset into current T/S list buffer. LDA (A4L),Y ;Get & save the relative sector number of (AFC4) STA RELFIRST ;the first data sector described in this ;T/S list. (AFC7) CLC ;Add maximum # of data secs that can ADC MXSCURTS ;possibly be described in this T/S list. STA RELASTP1 ;Store maximum relative sector number (plus 1) of INY ;the last data sector that can be described in list. LDA (A4L),Y STA RELFIRST+1 ADC MXSCURTS+1 STA RELASTP1+1 CLC ;Return with "no error" signal. (AFDB) RTS (AC3D) LDA FILTYPWA ;Get the file type (from the FM work area). BMI TOFILOCK ;Error - can't rename a locked file. LDA RENAMBUF ;Get the address of the SECONDARY FILE NAME STA A4L ;from the FM parameter list & put it in the LDA RENAMBUF+1 ;A4L/H pointer. STA A4L+1 LDX CURDIRNX ;(x) = index into the current directory sec. (AC4F) JSR NWDESCRP ;COPY THE NEW NAME FROM THE SECONDARY NAME ;BUFFER TO THE DIRECTORY SECTOR BUFFER. (B21C) NEWDSCRP LDY #0 ;Initialize index to name buffer. INX ;Set index to first char position in the name field INX ;of the file description entry in the directory sector. SETNWNAM INX LDA (A4L),Y ;Get char from the name buffer. STA FIL1TSTK,X ;Put it in the name field of file description INY ;space in the directory sector. CPY #30 ;30 chars in name (0 to 29). BNE SETNWNAM ;More chars to copy. LDX CURDIRNX ;Return with index pointing to the file SEC ;description entry space in the current (B22F) RTS ;directory sector and with (c) = 1 to signal a new entry ;was created (when not using RENAME function). (AC52) JSR WRDIRECT ;Write the modified directory sector to the disk. * Write the directory buffer. (B037) WRDIRECT JSR PT2DIRBF * Designate the directory sector buffer * as the I/O buffer in RWTS's IOB. (B045) PT2DIRBF LDA ADRDIRBF ;Get the addr of the directory sec buf STA IBBUFP ;in the FM constants table. LDA ADRDIRBF+1 ;Store it in RWTS's IOB. STA IBBUFP+1 (B051) RTS (B03A) LDX CURDIRTK ;Enter RWTS driver with (x)/(y) = trk/sec vals. LDY CURDIRSC LDA #2 ;Write opcode for RWTS. (B042) JMP RWTSDRVR ;Call RWTS driver to write the directory sector buffer. ------------ (B052) RWTSDRVR . . (See dis'mbly of RWTS driver using WRITE.) . . (RTS) (AC55) JMP GOODFMXT ;Exit the file manager cleanly. ------------ (AC6D) TOFILOCK JMP FILELOKD ------------ * Exit the file manager with or without errors. (B35F) LNGNOTAV LDA #1 (B361) BNE BADFMXIT ;ALWAYS. (B373) FILENOT LDA #6 BNE BADFMXIT ;ALWAYS. DISKFULL JMP FULLPTCH ;(See dis'mbly of errors.) NOP FILELOKD LDA #10 BNE BADFMXIT ;ALWAYS. GOODFMXT LDA RTNCODFM CLC ;(c) = 0 to signal good operation. BCC FMEXIT BADFMXIT SEC ;(c) = 1 to signal unsuccessful. FMEXIT PHP ;Save status on stack. STA RTNCODFM ;Store return code in FM parameter list. LDA #0 STA STATUS (B38E) JSR CPYFMWA ;Copy the work area to the work buffer. * Copy the FM work area (non-chain) to * the FM work buffer (in DOS chain). (AE7E) CPYFMWA JSR SELWKBUF ;Select the FM work buffer (in DOS chain). * Point the A4L/H pointer at the FM work buffer. (AF08) SELWKBUF LDX #0 ;Set index to select work buffer. (AF0A) BEQ PT2FMBUF ;ALWAYS. (AF12) PT2FMBUF LDA WRKBUFFM,X ;Get address of selected buffer from the STA A4L ;FM parameter list & put it in the pointer. LDA WRKBUFFM+1,X STA A4L+1 (AF1C) RTS (AE81) LDY #0 ;Initialize index. STORWRK LDA FMWKAREA,Y ;Get byte from the FM work area. STA (A4L),Y ;Put it in the work buffer. INY CPY #45 ;45 bytes to copy (0 to 44). BNE STORWRK (AE8D) RTS (B391) PLP ;Retrieve status of success of operation ;from the stack. (B392) LDX STKSAV ;Adjust stack pointer to force exit to the TXS ;caller even if we are several subroutines (B396) RTS ;deeper than the original entry point. ============ ;(Normally returns to AFTRFUNC ($A6AB) ;located in the FMDRIVER routine ($A6A8).)