557 lines
37 KiB
Plaintext
557 lines
37 KiB
Plaintext
******************************************************************
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* *
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* VERIFY, LOCK and UNLOCK Command Handlers *
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* *
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*----------------------------------------------------------------*
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* *
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* The LOCK command protects a file from being accidentally *
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* deleted or overwritten. This protection is removed by the *
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* UNLOCK command. The VERIFY command checks that the data *
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* associated with a particular file is encoded on the disk *
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* correctly. *
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* All three commands require a file name and can be issued *
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* with the optional volume, drive and slot parameters. Their *
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* execution patterns are also very similar. After loading the *
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* accumulator with the appropriate opcode, part of the common *
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* file manager command handler code is called to: *
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* 1) close the file if it is already open. *
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* 2) reassign a DOS buffer to the file to be *
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* verified, locked or unlocked. *
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* 3) call the file manager to do the function. *
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* 4) close the file. *
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* The lock/unlock FUNCTIONS have almost identical function *
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* handlers. After setting LOKUNLOK ($B39E) to lock ($80) or *
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* unlock ($00) the file, the COMNOPEN routine ($AB28) is called *
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* to search the directory sector for the file description entry *
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* corresponding to the named file. Failure to find the wanted *
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* file results in a file-not-found error message. If the named *
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* file is located, its file type code is read from the *
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* description entry. After the hi bit of the code is dropped, *
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* it is merged with the LOKUNLOK mask ($B39E) and stored back *
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* in the file description entry. The file is then locked or *
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* unlocked depending on whether the hi bit of the file type code *
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* is set or clear. (For example, an Applesoft file has a file *
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* type code of $82 or $02 if it is locked or unlocked. Once the *
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* description entry is updated, the modified directory sector is *
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* written back to the disk. *
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* The verify FUNTION handler work much differently. It *
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* opens the file and then read the sectors one at a time into *
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* the data sector buffer. As each sector is read, a checksum is *
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* calculated by RWTS. If the calculated checksum agrees with *
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* the checksum read off the disk, the data are verified. *
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* Failure to verify results in an I/O error messge. *
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* *
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* Although the VERIFY command can be used by itself, it is *
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* also called by the INIT, SAVE and BSAVE commands. *
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* Unfortunately, the VERIFY command is probably the least *
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* understood of all the DOS commands. Because RWTS *
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* automatically check the integrity of the data whenever some- *
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* thing is read from the disk, it seems that DOS is wasting *
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* valuable memory space by supporting the verify command and *
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* function handlers. However, when it is used by the INIT, SAVE *
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* or BSAVE cmds, the VERIFY routine saves time by checking the *
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* file right after it is written. In otherwords, you don't have *
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* to LOAD or BLOAD the file just to make sure that all went *
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* well. Because the VERIFY command can be used on any type of *
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* file, you don't have to write special driver programs to *
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* "read" special file types or text files just to be be sure *
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* that they were written to the disk correctly. (This later *
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* attribute can (under the right conditions) be used as a quick *
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* check to see if a protection-concious author has messed around *
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* with the checksum bytes.) *
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* *
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******************************************************************
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* On entry - CUMLOPTN ($AA65) has been updated
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* to reflect parsed option words (V, D, S).
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* - the validity of the options issued
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* with the command (and their numeric
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* values) have been checked.
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* - a legal file name has been parsed and
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* stored in the primary file name buffer
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* (PRIMFNBF, $AA75).
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(A27D)
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CMDVERFY LDA #12 ;Verify opcode.
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(A27F) BNE LOKUNLOK ;ALWAYS.
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(A271)
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CMDLOCK LDA #7 ;Lock opcode.
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(A273) BNE LOKUNLOK ;ALWAYS.
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(A275)
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CMDUNLOK LDA #8 ;Unlock opcode.
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(A277)
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LOKUNLOK JSR HNDLCMD1 ;Call part of the main command handler
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;routine to LOCK, UNLOCK or VERIFY
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;the file.
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* Part of common file manager command handler code.
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(A2AA)
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HNDLCMD1 STA TEMPBYT ;Store opcode in temporary location.
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LDA LENPRSD ;Get L-parameter from parsed table.
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BNE SAVLENFM ;Was a non-zero L-parm issued with cmd?
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LDA LENPRSD+1
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BNE SAVLENFM
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LDA #1 ;Length was 0 so make it 1 instead.
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STA LENPRSD
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SAVLENFM LDA LENPRSD ;Put length in FM parm list.
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STA RECLENFM
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LDA LENPRSD+1
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STA RECLENFM+1
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CLSLOCBF JSR CMDCLOSE ;Close file if it's already open.
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(A2C8)
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(A2EA)
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CMDCLOSE .
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.
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(See dis'mbly of CMDCLOSE given below.)
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.
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.
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- Note that execution flows thru CMDCLOSE twice if the
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file is already open.
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- The first time thru, the matching DOS filename buffer is
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located & then CLOSEONE is used to close the file.
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- Execution then jumps back to the start of CMDCLOSE.
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- On this second pass, a matching filename is not found
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because the DOS filename buffer was released on the
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first pass. Therefore, A5L/H is left pointing at the
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highest numbered (lowest in memory) FREE DOS buffer
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when CMCLOSE is exited via EVENTXIT and CLOSERTS.
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- If the file is not already open on the first entry to
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CMDCLOSE, only one pass is made. This single pass
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resembles the second pass mentioned above.
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.
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.
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- If necessary, the CLOSE FUNCTION updates the data
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sector, T/S list sector & the VTOC. It also fixes
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up links in the directory sectors and updates the
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file size if needed.
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.
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.
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(RTS)
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(A2CB) LDA A5L+1 ;Hi byte of A5L/H pointer which points at the highest
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;numbered (lowest in memory) free DOS name buffer (in chain).
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(A2CD) BNE SAVFNPTR ;Branch if found a free buffer.
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(A2CF) JMP NOBUFERR ;Go issue an out-of-buffers message.
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------------ ;(See dis'mbly of errors.)
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(A2D2)
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SAVFNPTR STA A3L+1 ;Reset A3L/H to point at DOS buffer that we
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LDA A5L ;will use for file name field buffer (chain).
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STA A3L
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(A2D8) JSR CPYPFN
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* NOTE: This (re)assigns a DOS buffer to the
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* file we want to verify, lock or unlock. The
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* buffer may or may not be the same one that
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* was just released by the CLOSE cmd above.
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* The highest numbered (lowest in memory) free
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* DOS buffer is used.
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(A743)
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CPYPFN LDY #29 ;30 bytes to copy (0 to 29).
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CPYPRIM LDA PRIMFNBF,Y ;Copy the name of the file wanted from
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STA (A3L),Y ;the primary filename buffer into the
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DEY ;filename field buffer (in DOS chain).
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BPL CPYRIM ;More chars to get.
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(A74D) RTS
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(A2DB) JSR BUFS2PRM
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* Get addresses of the various DOS buffers from the
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* chain buffer & put them in the FM parameter list.
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(A74E)
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BUFS2PRM LDY #30 ;Get addr of FM work buf, T/S list
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ADRINPRM LDA (A3L),Y ;buf, data sector buf & next DOS
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STA WRKBUFFM-30,Y ;filename buf from chain
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INY ;pointer buffer & put them in FM parm list.
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CPY #38 ;(P.S. Adr of next DOS file name buf is
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BNE ADRINPRM ;not used by DOS.)
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(A75A) RTS
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(A2DE) JSR CPY2PARM
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* Put volume, drive, & slot values plus the
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* address of the primary filename buffer
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* in the FM parameter list.
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(A71A)
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CPY2PARM LDA VOLPRSD ;From parsed table.
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STA VOLFM
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LDA DRVPRSD ;From parsed table.
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STA DRVFM
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LDA SLOTPRSD ;From parsed table.
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STA SLOTFM
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LDA ADRPFNBF ;Get the adr of the primary file
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STA FNAMBUFM ;name buf from the constants tbl
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LDA ADRPFNBF+1 ;and put it in the FM parm list.
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STA FNAMBUFM+1
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LDA A3L ;Save adr of current DOS file name
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STA CURFNADR ;buf in table of DOS variables.
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LDA A3L+1
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STA CURFNADR+1
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(A742) RTS
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(A2E1) LDA TEMPBYT ;Get verify, lock or unlock opcode back from temporary
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STA OPCODEFM ;buffer & put it in the FM parameter list.
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(A2E7) JMP FMDRIVER
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------------
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* Use the file manager driver to do the
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* VERIFY, LOCK or UNLOCK FUNCTIONS.
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(A6A8)
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FMDRIVER JSR FILEMGR ;Call the file manager to do the function.
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* File manager proper.
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(AB06)
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FILEMGR TSX ;Save stk pointer so can later rtn to caller of FM.
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STX STKSAV
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(AB0A) JSR RSTRFMWA
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* Copy FM work buf (in DOS chain) to
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* FM work area (not in DOS chain).
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(AE6A)
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RSTRFMWA JSR SELWKBUF ;Point A4L/H at FM work buf.
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* Get addr of FM work buff from
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* the FM parm list & put it in
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* the A4L/H pointer.
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(AF08)
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SELWKBUF LDX #0 ;Offset to select
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;work buffer.
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(AF0A) BEQ PT2FMBUF ;ALWAYS.
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(AF12)
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PT2FMBUF LDA WRKBUFFM,X
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STA A4L
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LDA WRKBUFFM+1,X
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STA A4L+1
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(AF1C) RTS
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(AE6D) LDY #0 ;Zero out return code in FM parm list to
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STY RTNCODFM ;signal no errors as default condition.
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STORFMWK LDA (A4L),Y ;Copy FM work buf to FM work area.
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STA FMWKAREA,Y
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INY
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CPY #45 ;45 bytes to copy (0 to 44).
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BNE STORFMWK
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CLC ;WHY?????
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(AE7D) RTS
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(AB0D) LDA OPCODEFM ;Check if opcode is legal.
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CMP #13 ;(Must be less than 13.)
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BCS TOERROP ;Opcode too large so got range error.
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ASL ;Double val of opcode & put it in (x)
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TAX ;so it indexes tables of adrs.
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LDA FMFUNCTB+1,X ;Stick adr of appropriate function
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PHA ;handler on stack (hi byte first).
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LDA FMFUNCTB,X
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PHA
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(AB1E) RTS ;DO STACK JUMP TO FUNCTION ENTRY POINT.
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.
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.
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(See dis'mbly of the appropriate function.)
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.
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.
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RE: LOCK OR UNLOCK FUNCTION.
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- uses part of COMNOPEN routine.
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- reads in VTOC to get link to 1rst directory.
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- reads directory secs in & looks for file
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description entry with matching filename.
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- if matching name found, modifies the file
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type code with LOKUNMSK ($B39E) to denote
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a locked or unlocked file.
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- writes updated directory sector buffer to disk.
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.
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.
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RE: VERIFY FUNCTION.
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- reads in VTOC & appropriate directory, T/S list
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& data sectors.
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- The verify function simply opens & then reads
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a file. Actual verification occurs deep within
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RWTS. As the data are read in, a checksum is
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calculated. If the calculated checksum agrees
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with the checksum read off the disk, the integrity
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of the data is verified. Failure to verify yeilds
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an I/O error.
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.
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.
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(RTS)
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============
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TOERROP JMP RNGERROP ;Go handle range error.
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(AB1F) ------------ ;(See dis'mbly of errors.)
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* Return here after doing the verify, lock
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* or unlock functions. (Cause after @
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* function is done, use stack to get back
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* to the original caller.)
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(A6AB)
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AFTRFUNC BCC FMDRVRTN ;(c) = 0 = no errors.
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LDA RTNCODFM ;Get error code from FM parameter list.
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CMP #$5 ;End of data error?
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(A6B2) BEQ TOAPPTCH ;Yes - Encountered a zeroed-out T/S link or
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;a zeroed-out data pair (trk/sec vals)
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;listed in the T/S list. (Not applicable
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;to the lock, unlock or verify functions.)
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(A6B4) JMP OTHRERR ;Got an error other than an end-of-data error.
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------------ ;(See dis'mbly of errors.)
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(A6C3)
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FMDRVRTN RTS
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(A27A) JMP CMDCLOSE ;Go back into CMDCLOSE to close the
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------------ ;file that was just opened via the
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;verify, lock or unlock function.
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* Because the file is already open, execution flows
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* thru the close cmd twice. The first time thru, the matching
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* DOS filename buffer is located & then CLOSEONE is used to
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* close the file via the close FUNCTION. The 2nd time thru, a
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* matching filename buffer is not found because the DOS
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* buffer was released on the first pass. Therefore, A5L/H is
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* left pointing at the highest numbered (lowest in memory)
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* FREE DOS buffer when the close command is exited via EVENTXIT
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* and CLOSERTS.
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*
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* (P.S. NOT ALL RAMIFICATIONS OF THE CLOSE COMMAND ARE SHOWN
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* BELOW.)
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(A2EA)
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CMDCLOSE LDA PRIMFNBF ;Get 1rst char from primary name buffer.
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CMP #" " ;Don't allow leading <spc> in name.
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(A2EF) BEQ CLOSEALL ;Leading <spc> = signal to close all files.
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;(A close cmd was issued with no
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;accompanying file name.)
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(A2F1) JSR GETBUFF ;Locate a DOS file buffer.
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* Locate buffer with same name.
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* If that fails, locate a free buffer.
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(A764)
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GETBUFF LDA #0 ;Default hi-byte of pointer to 0
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STA A5L+1 ;(ie. assume no free buff available).
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(A768) JSR GETFNBF1 ;Get pointer to 1rst filename buffer in chain.
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(A792)
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GETFNBF1 LDA ADOSFNB1 ;First link to chain of DOS buffers
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LDX ADOSFNB1+1 ;(ie. pt 2 1rst name buf in chain).
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(A798) BNE SETNXPTR ;ALWAYS.
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(A7A4)
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SETNXPTR STX A3L+1 ;Put addr of 1rst filename buffer in ptr
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STA A3L ;(ie. highest name buffer in chain).
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TXA ;Get hi-byte of addr in back in (a).
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GETNXRTN RTS
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(A7A9)
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(A76B) JMP FNCHAR1 ;Get first byte from DOS name buf.
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------------
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(A76E)
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GETFNLNK JSR GETNXBUF
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* Get addr of next filename buffer in chain
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* from chain pointers buffer offset 37 & 36
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* bytes from 1rst char of present filename
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* buffer.
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(A79A)
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GETNXBUF LDY #37 ;Point the pointer at the chain buffer &
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LDA (A3L),Y ;get addr of the next filename buffer.
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BEQ GETNXRTN ;If hi-byte is 0, then link zeroed out.
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TAX ;Save hi-byte in (x).
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DEY ;Pick up low-byte.
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LDA (A3L),Y
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SETNXPTR STX A3L+1 ;Stick addr of filename buffer in ptr.
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STA A3L
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TXA ;Get hi-byte back in (a).
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GETNXRTN RTS
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(A7A9)
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(A771) BEQ NOFNMTCH ;Link zeroed out, end of chain.
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FNCHAR1 JSR GETFNBY1 ;Get the 1rst char of filename from buf in chain.
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(A773)
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* Get first byte of DOS name buffer.
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(A7AA)
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GETFNBY1 LDY #0 ;Buffer is free if 1rst byte = $00.
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LDA (A3L),Y ;If buf occuppied, the 1rst byte = 1rst
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(A7AE) RTS ;char of filename which owns buffer.
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(A776) BNE NXFNBUF ;Take branch if buffer wasn't free.
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LDA A3L ;Buffer was free, there4 point the A5L/H
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STA A5L ;pointer at the free buffer.
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LDA A3L+1
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STA A5L+1
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(A780) BNE GETFNLNK ;ALWAYS.
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(A782)
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NXFNBUF LDY #29 ;Buffer not free there4 compare name
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CMPFNCHR LDA (A3L),Y ;of owner with name of file in primary
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CMP PRIMFNBF,Y ;name buffer. (Start with last char first.)
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(A789) BNE GETFNLNK ;Char doesn't match, there4 look for another
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;buffer that might have same name.
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(A78B) DEY ;That char matched, how bout rest of name?
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BPL CMPFNCHR ;30 chars in name (ie. 0 to 29).
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CLC ;Clr carry to signal that names match.
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(A78F) RTS
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============
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(A790)
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NOFNMTCH SEC ;Link zeroed out.
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(A791) RTS
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============
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(A2F4)
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EVENTXIT BCS CLOSERTS ;EVENTUALLY exit via this route.
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(A2F6) JSR CLOSEONE ;Matching file name was found, so close that file.
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* Close a particular file.
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(A2FC)
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CLOSEONE JSR CKEXCBUF
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* Check if current filename buffer
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* belongs to an EXEC file. After all,
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* don't want to close buffer if we are
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* using it to exec (ie. would be like
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* burying ourselves alive).
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(A7AF)
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CKEXCBUF LDA EXECFLAG ;Check to see if EXECing.
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BEQ NOTEXCBF ;No sweat - not running exec file.
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LDA EXECBUFF ;We are EXECing, there4 chk if addr of
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CMP A3L ;current filename buffer same as that
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BNE CKEXCRTN ;for buffer belonging to EXEC.
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LDA EXECBUFF+1 ;Maybe - low-bytes matched,
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CMP A3L+1 ;so now check hi bytes of addr.
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BEQ CKEXCRTN ;Exec buffer = current buffer.
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NOTEXCBF DEX ;Not EXECing, DEX to make sure z-flag off.
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(A7C2) ;(P.S. (x) was orig set to large non-zero
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;val on entry to GETFNBF1. There4, if now
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;DEX, can be sure z-flag will be off.)
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CKEXCRTN RTS ;Exit with z-flag = 1 if execing.
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(A7C3) ; = 0 if not execing.
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(A2FF) BNE FREEBUFF ;Not EXECing from this particular file.
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LDA #0 ;Closing an exec file so shut
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STA EXECFLAG ;off the exec flag.
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FREEBUFF LDY #0 ;Free up the DOS buffer by poking a $00 in
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TYA ;1rst byte of filename.
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STA (A3L),Y
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(A30B) JSR BUFS2PRM
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* GET addresses of the DOS buffers from chain
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* buffer & put them in FM parameter list.
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(A74E)
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BUFS2PRM LDY #30 ;Get addresses of FM Work buffer,
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ADRINPRM LDA (A3L),Y ;T/S list buffer, Data sec buffer and
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STA WRKBUFFM-30,Y ;NEXT filename buf from the chain ptr
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INY ;buf & put them in the FM parameter list.
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CPY #38 ;(P.S. addr of NEXT filename buffer
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BNE ADRINPRM ;is not used by DOS.)
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(A75A) RTS
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(A30E) LDA #2 ;Stick opcode for CLOSE function
|
|
STA OPCODEFM ;in the FM parameter list.
|
|
(A313) JMP FMDRIVER ;Get ready to do the function.
|
|
------------
|
|
(A6A8)
|
|
FMDRIVER JSR FILEMGR ;Call the file manager to do the function.
|
|
|
|
(AB06)
|
|
FILEMGR TSX ;Save stk ptr so we can rtn to caller.
|
|
STX STKSAV
|
|
(AB0A) JSR RSTRFMWA ;Copy contents of FM work buffer (in DOS
|
|
;chain) to FM work area (not in chain).
|
|
|
|
(AE6A)
|
|
RSTRFMWA JSR SELWKBUF ;Find FM work buffer.
|
|
|
|
* Get address of FM work buffer (chain)
|
|
* from the FM parameter list & stick
|
|
* it in the A4L/H pointer.
|
|
(AF08)
|
|
SELWKBUF LDA #0
|
|
(AF0A) BEQ PT2FMBUF ;ALWAYS.
|
|
|
|
(AF12)
|
|
PT2FMBUF LDA WRKBUFFM,X
|
|
STA A4L
|
|
LDA WRKBUFFM+1,X
|
|
STA A4L+1
|
|
(AF1C) RTS
|
|
|
|
(AE6D) LDY #0 ;Zero-out rtn code in FM parm
|
|
STY RTNCODFM ;list to signal no errors.
|
|
STORFMWK LDA (A4L),Y ;Copy FM work buf (in chain) to the FM
|
|
STA FMWKAREA,Y ;work area (not in DOS buffer chain).
|
|
INY
|
|
CPY #45
|
|
BNE STORFMWK
|
|
CLC ;Why?????
|
|
(AE7D) RTS
|
|
|
|
(AB0D) LDA OPCODEFM ;Chk if opcode is legal.
|
|
CMP #13 ;(Must be less than 13.)
|
|
BCS TOERROP ;Opcode too large, got range error.
|
|
ASL ;Double val of opcode & get addr of
|
|
TAX ;appropriate function handler from tbl.
|
|
LDA FMFUNCTB+1,X ;Put the adr on stack (hi byte first)
|
|
PHA ;& then do a "stack jump" to the appropriate
|
|
LDA FMFUNCTB,X ;function handler.
|
|
PHA
|
|
(AB1E) RTS
|
|
|
|
.
|
|
.
|
|
(AC06) .
|
|
FNCLOSE .
|
|
.
|
|
.
|
|
(See dis'mbly of CLOSE function.)
|
|
.
|
|
.
|
|
- if necessary, free up any sectors that
|
|
were previously allocated to the file
|
|
but not needed.
|
|
- also updates the file size, fixes up
|
|
links & updates data, VTOC, T/S list
|
|
& directory sectors if necessary.
|
|
.
|
|
.
|
|
(RTS)
|
|
============
|
|
|
|
TOERROP JMP RNGERROP ;(To $B363 - see dis'mbly of errors.)
|
|
(AB1F) ------------
|
|
|
|
* Return here after doing the close function
|
|
* (Cause after @ function is done, use stack
|
|
* to get back to original caller.)
|
|
(A6AB)
|
|
AFTRFUNC BCC FMDRVRTN ;(c) = 0 = no errors.
|
|
LDA RTNCODFM ;Get error code from FM parameter list.
|
|
CMP #$5 ;End of data error?
|
|
(A6B2) BEQ TOAPPTCH ;Yes - Encountered a zeroed-out T/S link or
|
|
;a zeroed-out data pair (trk/sec vals)
|
|
;listed in the T/S list. (Not applicable to
|
|
;the close function.)
|
|
(A6B4) JMP OTHRERR ;Got an error other than an end-of-data error.
|
|
------------ ;(See dis'mbly of errors.)
|
|
|
|
(A6C3)
|
|
FMDRVRTN RTS
|
|
|
|
(A2F9) JMP CMDCLOSE ;Go back into CMDCLOSE to point the A5L/H
|
|
------------ ;pointer at the highest numbered (lowest in
|
|
;memory) free filename buffer in chain of
|
|
;DOS buffers & then exit CMDCLOSE & CMDVERFY
|
|
;(or CMDLOCK or CMDUNLOK) via EVENTXIT &
|
|
;CLOSERTS.
|
|
|
|
(A330)
|
|
CLOSERTS RTS ;Exit to caller of command.
|
|
============ ;(Normally returns to AFTRCMD ($A17D) in the
|
|
;command parsing and processing routines.)
|