525 lines
35 KiB
Plaintext
525 lines
35 KiB
Plaintext
******************************************************************
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* *
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* RENAME Command Handler *
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* *
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*----------------------------------------------------------------*
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* *
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* The RENAME command changes the name of a file on the disk.*
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* Both the old name and a new name must be issued with the *
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* command. Volume, drive and slot parameters are optional. A *
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* locked file cannot be RENAMEd. *
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* Note that no check is made to insure that a new name does *
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* not duplicate that of a file already on the disk. Therefore, *
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* misuse of the RENAME command can result in a catalog display *
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* similar to the following: HELLO *
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* MY FIRST PRGM *
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* FREDS PRGM *
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* MY FIRST PRGM *
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* If a command containing a duplicate file name is used, the *
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* computer will always try to utilize the first version listed. *
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* Therefore, the second version will appear to be unusable. *
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* Fortunately, the RENAME command can be used to repair damage *
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* caused by its previous misuse. For example, if you want to *
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* change the above catalog to read: HELLO *
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* MY FIRST PRGM *
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* FREDS PRGM *
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* MY 2ND PRGM *
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* then, use the following sequence of commands: *
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* RENAME MY FIRST PRGM, TEMP NAME *
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* RENAME MY FIRST PRGM, MY 2ND PRGM *
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* RENAME TEMP NAME, MY FIRST PRGM *
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* If you RENAME the greeting program, the disk won't boot *
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* correctly unless you put a new program with the same greeting *
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* name on the disk. Failure to boot results from the fact that *
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* the boot looks for the greeting name in the primary file name *
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* buffer that was "etched" on the disk during an INIT. The *
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* image of the original primary file name buffer is located on *
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* the disk at trk$01/sec$09/offset$75 to trk$01/sec$09/offset$92.*
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* Therefore if you feel compelled to change the name of the *
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* greeting program, you must zap this area of the disk with the *
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* new file name after you use the RENAME command. If necessary, *
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* be sure to add trailing spaces to the new file name to fill *
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* the entire 30-byte buffer (or else residual characters from *
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* the original name may be tacked on to the end of the new name).*
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* *
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* Execution pattern: *
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* The RENAME command handler first copies the address of *
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* the secondary file name buffer (SCNDFNBF, $AA93) from ADRSFNBF *
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* ($9D08) to RENAMBUF ($B5BD) in the FM parameter list. The *
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* file is then closed if it is already open. A DOS buffer is *
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* (re-)assigned to the file and the file manager is called to *
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* execute the rename function (FNRENAME, $AC3A). FNRENAME calls *
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* the COMNOPEN routine ($AB28) to configure the FM work area and *
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* search for the original file name. The directory sectors are *
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* then read in one at a time until the appropriate file *
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* description entry is found. If the old file name cannot be *
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* located, a file-not-found message is generated. Once the old *
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* file name is located, the new name is copied from the secondary*
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* file name buffer (SCNFNBF, $AA93) to the name field of the *
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* description entry in the directory sector buffer. Finally, *
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* the file is closed via the close command handler (CMDCLOSE, *
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* $A2EA). *
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* *
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******************************************************************
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* On entry - CUMLOPTN ($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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* - legal file names have been parsed and
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* stored in the primary (PRIMFNBF, $AA75) &
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* secondary (SCNDFNBF, $AA93) file name bufs.
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(A281)
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CMDRENAM LDA ADRSFNBF ;Copy addr of secondary filename buffer
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STA RENAMBUF ;to the rename buffer in the FM parm list.
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LDA ADRSFNBF+1
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STA RENAMBUF+1
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LDA #9 ;Put RENAME opcode in (a) and save it in
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STA TEMPBYT ;temporary buffer.
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(A292) JSR CLSLOCBF ;Close file if it is already open and then
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;do the RENAME function:
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; -copy new file name to directory sector
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; buffer & then write the updated directory
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; sector back to the disk.
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(A2C8)
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CLSLOCBF JSR CMDCLOSE ;Close file if it's already open.
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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 rename. The buffer may or
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* may not be the same one that was just released
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* by the CLOSE cmd above. The highest numbered
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* (lowest in memory) free 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 RENAME opcode back from temporary buffer
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STA OPCODEFM ;and 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
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* to do the RENAME FUNCTION.
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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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(AC3A)
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FNRENAME .
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.
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(See dis'mbly of RENAME function.)
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.
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.
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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 in 1rst directory sec & searches
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for matching primary filename. If not found,
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reads in next directory sec to determine
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if file is locked or not.
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- if file locked, then get addr of secondary
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filename buf from FM parm list & copy secondary
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filename into filename field of file
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description entry in directory sector.
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- writes updated directory sector to disk.
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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 RENAME function.
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* (Cause after @ function is done, use stack
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* to get back 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) in a
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;T/S list. (Not applicable to rename function.)
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(A6B4) JMP OTHRERR ;No. See dis'mbly of errors.
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------------
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(A6C3)
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FMDRVRTN RTS
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(A295) JMP CMDCLOSE ;Exit RENAME cmd via CLOSE cmd.
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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 RENAME 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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* (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 ;Go get first byte in 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 from 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 names matched.
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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 specific 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 is not
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BNE ADRINPRM ;used by DOS.)
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(A75A) RTS
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(A30E) LDA #2 ;Stick opcode for CLOSE function
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STA OPCODEFM ;in the FM parameter list.
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(A313) JMP FMDRIVER ;Get ready to do the function.
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------------
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(A6A8)
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FMDRIVER JSR FILEMGR ;Call the file manager to do the function.
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(AB06)
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FILEMGR TSX ;Save stk ptr so we can rtn to caller.
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STX STKSAV
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(AB0A) JSR RSTRFMWA ;Copy contents of FM work buffer (in DOS
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;chain) to FM work area (not in chain).
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(AE6A)
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RSTRFMWA JSR SELWKBUF ;Find FM work buffer.
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* Get address of FM work buf from FM parm
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* list & stick it in the A4L/H pointer.
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(AF08)
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SELWKBUF LDA #0
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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
|
|
STY RTNCODFM ;to signal no errors.
|
|
STORFMWK LDA (A4L),Y ;Copy FM work buff (in chain) to FM work
|
|
STA FMWKAREA,Y ;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 #$5 ;End-of-data error?
|
|
(A6B2) BEQ TOAPPTCH ;Yes - encountered a zeroed-out T/S link or
|
|
;a zeroed-out data pair (trk/sec vals) in a
|
|
;T/S list. (Not applicable to close function.)
|
|
(A6B4) JMP OTHRERR ;No. See dis'mbly of errors.
|
|
------------
|
|
|
|
(A6C3)
|
|
FMDRVRTN RTS
|
|
|
|
(A2F9) JMP CMDCLOSE ;Go back into CMDCLOSE to point A5L/H pointer
|
|
------------ ;at the highest numbered (lowest in
|
|
;memory) free filename buffer in chain of DOS
|
|
;buffers & then exit CMDCLOSE via EVENTXIT & CLOSERTS.
|
|
|
|
(A330)
|
|
CLOSERTS RTS ;Exit to the caller of the RENAME command.
|
|
============ ;(Normally returns to AFTRCMD ($A17D) in the
|
|
;command parsing and processing routines.)
|