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