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-=-=-=-=-=-=-
- *****************************************************************
- *
- RENAME Command Handler *
- *
- ----------------------------------------------------------------*
- *
- The RENAME command changes the name of a file on the disk.*
- Both the old name and a new name must be issued with the *
- command. Volume, drive and slot parameters are optional. A *
- locked file cannot be RENAMEd. *
- Note that no check is made to insure that a new name does *
- not duplicate that of a file already on the disk. Therefore, *
- misuse of the RENAME command can result in a catalog display *
- similar to the following: HELLO *
- MY FIRST PRGM *
- FREDS PRGM *
- MY FIRST PRGM *
- If a command containing a duplicate file name is used, the *
- computer will always try to utilize the first version listed. *
- Therefore, the second version will appear to be unusable. *
- Fortunately, the RENAME command can be used to repair damage *
- caused by its previous misuse. For example, if you want to *
- change the above catalog to read: HELLO *
- MY FIRST PRGM *
- FREDS PRGM *
- MY 2ND PRGM *
- then, use the following sequence of commands: *
- RENAME MY FIRST PRGM, TEMP NAME *
- RENAME MY FIRST PRGM, MY 2ND PRGM *
- RENAME TEMP NAME, MY FIRST PRGM *
- If you RENAME the greeting program, the disk won't boot *
- correctly unless you put a new program with the same greeting *
- name on the disk. Failure to boot results from the fact that *
- the boot looks for the greeting name in the primary file name *
- buffer that was "etched" on the disk during an INIT. The *
- image of the original primary file name buffer is located on *
- the disk at trk$01/sec$09/offset$75 to trk$01/sec$09/offset$92.*
- Therefore if you feel compelled to change the name of the *
- greeting program, you must zap this area of the disk with the *
- new file name after you use the RENAME command. If necessary, *
- be sure to add trailing spaces to the new file name to fill *
- the entire 30-byte buffer (or else residual characters from *
- the original name may be tacked on to the end of the new name).*
- *
- Execution pattern: *
- The RENAME command handler first copies the address of *
- the secondary file name buffer (SCNDFNBF, $AA93) from ADRSFNBF *
- ($9D08) to RENAMBUF ($B5BD) in the FM parameter list. The *
- file is then closed if it is already open. A DOS buffer is *
- (re-)assigned to the file and the file manager is called to *
- execute the rename function (FNRENAME, $AC3A). FNRENAME calls *
- the COMNOPEN routine ($AB28) to configure the FM work area and *
- search for the original file name. The directory sectors are *
- then read in one at a time until the appropriate file *
- description entry is found. If the old file name cannot be *
- located, a file-not-found message is generated. Once the old *
- file name is located, the new name is copied from the secondary*
- file name buffer (SCNFNBF, $AA93) to the name field of the *
- description entry in the directory sector buffer. Finally, *
- the file is closed via the close command handler (CMDCLOSE, *
- $A2EA). *
- *
- *****************************************************************
- On entry - CUMLOPTN ($AA65) has been updated
- to reflect parsed option words (V, D ,S).
- - the validity of the options issued
- with the command (and their numeric
- values) have been checked.
- - legal file names have been parsed and
- stored in the primary (PRIMFNBF, $AA75) &
- secondary (SCNDFNBF, $AA93) file name bufs.
(A281)
CMDRENAM LDA ADRSFNBF ;Copy addr of secondary filename buffer
STA RENAMBUF ;to the rename buffer in the FM parm list.
LDA ADRSFNBF+1
STA RENAMBUF+1
LDA #9 ;Put RENAME opcode in (a) and save it in
STA TEMPBYT ;temporary buffer.
(A292) JSR CLSLOCBF ;Close file if it is already open and then
;do the RENAME function:
; -copy new file name to directory sector
; buffer & then write the updated directory
; sector back to the disk.
(A2C8)
CLSLOCBF JSR CMDCLOSE ;Close file if it's already open.
(A2EA)
CMDCLOSE .
.
(See dis'mbly of CMDCLOSE given below.)
.
.
- Note that execution flows thru CMDCLOSE twice if the
file is already open.
- The first time thru, the matching DOS filename buffer is
located & then CLOSEONE is used to close the file.
- Execution then jumps back to the start of CMDCLOSE.
- On this second pass, a matching filename is not found
because the DOS filename buffer was released on the
first pass. Therefore, A5L/H is left pointing at the
highest numbered (lowest in memory) FREE DOS buffer
when CMCLOSE is exited via EVENTXIT and CLOSERTS.
- If the file is not already open on the first entry to
CMDCLOSE, only one pass is made. This single pass
resembles the second pass mentioned above.
.
.
- If necessary, the CLOSE FUNCTION updates the data
sector, T/S list sector & the VTOC. It also fixes
up links in the directory sectors and updates the
file size if needed.
.
.
(RTS)
(A2CB) LDA A5L+1 ;Hi byte of A5L/H pointer which points at the highest
;numbered (lowest in memory) free DOS name buffer (in chain).
(A2CD) BNE SAVFNPTR ;Branch if found a free buffer.
(A2CF) JMP NOBUFERR ;Go issue an out-of-buffers message.
------------ ;(See dis'mbly of errors.)
(A2D2)
SAVFNPTR STA A3L+1 ;Reset A3L/H to point at DOS buffer that we
LDA A5L ;will use for file name field buffer (chain).
STA A3L
(A2D8) JSR CPYPFN
* NOTE: This (re)assigns a DOS buffer to the
* file we want to rename. The buffer may or
* may not be the same one that was just released
* by the CLOSE cmd above. The highest numbered
* (lowest in memory) free DOS buffer is used.
(A743)
CPYPFN LDY #29 ;30 bytes to copy (0 to 29).
CPYPRIM LDA PRIMFNBF,Y ;Copy the name of the file wanted from
STA (A3L),Y ;the primary filename buffer into the
DEY ;filename field buffer (in DOS chain).
BPL CPYRIM ;More chars to get.
(A74D) RTS
(A2DB) JSR BUFS2PRM
* Get addresses of the various DOS buffers from the
* chain buffer & put them in the FM parameter list.
(A74E)
BUFS2PRM LDY #30 ;Get addr of FM work buf, T/S list
ADRINPRM LDA (A3L),Y ;buf, data sector buf & next DOS
STA WRKBUFFM-30,Y ;filename buf from chain
INY ;pointer buffer & put them in FM parm list.
CPY #38 ;(P.S. Adr of next DOS file name buf is
BNE ADRINPRM ;not used by DOS.)
(A75A) RTS
(A2DE) JSR CPY2PARM
* Put volume, drive, & slot values plus the
* address of the primary filename buffer
* in the FM parameter list.
(A71A)
CPY2PARM LDA VOLPRSD ;From parsed table.
STA VOLFM
LDA DRVPRSD ;From parsed table.
STA DRVFM
LDA SLOTPRSD ;From parsed table.
STA SLOTFM
LDA ADRPFNBF ;Get the adr of the primary file
STA FNAMBUFM ;name buf from the constants tbl
LDA ADRPFNBF+1 ;and put it in the FM parm list.
STA FNAMBUFM+1
LDA A3L ;Save adr of current DOS file name
STA CURFNADR ;buf in table of DOS variables.
LDA A3L+1
STA CURFNADR+1
(A742) RTS
(A2E1) LDA TEMPBYT ;Get RENAME opcode back from temporary buffer
STA OPCODEFM ;and put it in the FM parameter list.
(A2E7) JMP FMDRIVER
------------
* Use the file manager driver
* to do the RENAME FUNCTION.
(A6A8)
FMDRIVER JSR FILEMGR ;Call the file manager to do the function.
* File manager proper.
(AB06)
FILEMGR TSX ;Save stk pointer so can later rtn to caller of FM.
STX STKSAV
(AB0A) JSR RSTRFMWA
* Copy FM work buf (in DOS chain) to
* FM work area (not in DOS chain).
(AE6A)
RSTRFMWA JSR SELWKBUF ;Point A4L/H at FM work buf.
* Get addr of FM work buff from
* the FM parm list & put it in
* the A4L/H pointer.
(AF08)
SELWKBUF LDX #0 ;Offset to select
;work buffer.
(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 return code in FM parm list to
STY RTNCODFM ;signal no errors as default condition.
STORFMWK LDA (A4L),Y ;Copy FM work buf to FM work area.
STA FMWKAREA,Y
INY
CPY #45 ;45 bytes to copy (0 to 44).
BNE STORFMWK
CLC ;WHY?????
(AE7D) RTS
(AB0D) LDA OPCODEFM ;Check if opcode is legal.
CMP #13 ;(Must be less than 13.)
BCS TOERROP ;Opcode too large so got range error.
ASL ;Double val of opcode & put it in (x)
TAX ;so it indexes tables of adrs.
LDA FMFUNCTB+1,X ;Stick adr of appropriate function
PHA ;handler on stack (hi byte first).
LDA FMFUNCTB,X
PHA
(AB1E) RTS ;DO STACK JUMP TO FUNCTION ENTRY POINT.
.
.
(AC3A)
FNRENAME .
.
(See dis'mbly of RENAME function.)
.
.
- uses part of COMNOPEN routine.
- reads in VTOC to get link to 1rst directory.
- reads in 1rst directory sec & searches
for matching primary filename. If not found,
reads in next directory sec to determine
if file is locked or not.
- if file locked, then get addr of secondary
filename buf from FM parm list & copy secondary
filename into filename field of file
description entry in directory sector.
- writes updated directory sector to disk.
.
.
(RTS)
============
TOERROP JMP RNGERROP ;Go handle range error.
(AB1F) ------------ ;(See dis'mbly of errors.)
* Return here after doing the RENAME function.
* (Cause after @ function is done, use stack
* to get back to the 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 rename function.)
(A6B4) JMP OTHRERR ;No. See dis'mbly of errors.
------------
(A6C3)
FMDRVRTN RTS
(A295) JMP CMDCLOSE ;Exit RENAME cmd via CLOSE cmd.
- Because the file is already open, execution flows
- thru the CLOSE cmd twice. The first time thru, the matching
- DOS filename buffer is located & then CLOSEONE is used to
- close the file via the RENAME FUNCTION. The 2nd time thru, a
- matching filename buffer is not found because the DOS
- buffer was released on the first pass. Therefore, A5L/H is
- left pointing at the highest numbered (lowest in memory)
- FREE DOS buffer when the CLOSE command is exited via EVENTXIT
- and CLOSERTS.
- (P.S. NOT ALL RAMIFICATIONS OF THE CLOSE COMMAND ARE SHOWN
- BELOW.)
(A2EA)
CMDCLOSE LDA PRIMFNBF ;Get 1rst char from primary name buffer.
CMP #" " ;Don't allow leading <spc> in name.
(A2EF) BEQ CLOSEALL ;Leading <spc> = signal to close all files.
;(A CLOSE cmd was issued with no
;accompanying file name.)
(A2F1) JSR GETBUFF ;Locate a DOS file buffer.
* Locate buffer with same name.
* If that fails, locate a free buffer.
(A764)
GETBUFF LDA #0 ;Default hi-byte of pointer to 0
STA A5L+1 ;(ie. assume no free buff available).
(A768) JSR GETFNBF1 ;Get pointer to 1rst filename buffer in chain.
(A792)
GETFNBF1 LDA ADOSFNB1 ;First link to chain of DOS buffers
LDX ADOSFNB1+1 ;(ie. pt 2 1rst name buf in chain).
(A798) BNE SETNXPTR ;ALWAYS.
(A7A4)
SETNXPTR STX A3L+1 ;Put addr of 1rst filename buffer in ptr
STA A3L ;(ie. highest name buffer in chain).
TXA ;Get hi-byte of addr in back in (a).
GETNXRTN RTS
(A7A9)
(A76B) JMP FNCHAR1 ;Go get first byte in DOS name buf.
------------
(A76E)
GETFNLNK JSR GETNXBUF
* Get addr of next filename buffer in chain
* from chain pointers buffer offset 37 & 36
* bytes from 1rst char of present filename
* buffer.
(A79A)
GETNXBUF LDY #37 ;Point the pointer at the chain buffer &
LDA (A3L),Y ;get addr of the next filename buffer.
BEQ GETNXRTN ;If hi-byte is 0, then link zeroed out.
TAX ;Save hi-byte in (x).
DEY ;Pick up low-byte.
LDA (A3L),Y
SETNXPTR STX A3L+1 ;Stick addr of filename buffer in ptr.
STA A3L
TXA ;Get hi-byte back in (a).
GETNXRTN RTS
(A7A9)
(A771) BEQ NOFNMTCH ;Link zeroed out, end of chain.
FNCHAR1 JSR GETFNBY1 ;Get the 1rst char of filename from buf in chain.
(A773)
* Get first byte from DOS name buffer.
(A7AA)
GETFNBY1 LDY #0 ;Buffer is free if 1rst byte = $00.
LDA (A3L),Y ;If buf occuppied, the 1rst byte = 1rst
(A7AE) RTS ;char of filename which owns buffer.
(A776) BNE NXFNBUF ;Take branch if buffer wasn't free.
LDA A3L ;Buffer was free, there4 point the A5L/H
STA A5L ;pointer at the free buffer.
LDA A3L+1
STA A5L+1
(A780) BNE GETFNLNK ;ALWAYS.
(A782)
NXFNBUF LDY #29 ;Buffer not free there4 compare name
CMPFNCHR LDA (A3L),Y ;of owner with name of file in primary
CMP PRIMFNBF,Y ;name buffer. (Start with last char first.)
(A789) BNE GETFNLNK ;Char doesn't match, there4 look for another
;buffer that might have same name.
(A78B) DEY ;That char matched, how bout rest of name?
BPL CMPFNCHR ;30 chars in name (ie. 0 to 29).
CLC ;Clr carry to signal names matched.
(A78F) RTS
============
(A790)
NOFNMTCH SEC ;Link zeroed out.
(A791) RTS
============
(A2F4)
EVENTXIT BCS CLOSERTS ;EVENTUALLY exit via this route.
(A2F6) JSR CLOSEONE ;Matching file name was found, so close that file.
* Close a specific file.
(A2FC)
CLOSEONE JSR CKEXCBUF
* Check if current filename buffer
* belongs to an EXEC file. After all,
* don't want to close buffer if we are
* using it to exec (ie. would be like
* burying ourselves alive).
(A7AF)
CKEXCBUF LDA EXECFLAG ;Check to see if EXECing.
BEQ NOTEXCBF ;No sweat - not running exec file.
LDA EXECBUFF ;We are EXECing, there4 chk if addr of
CMP A3L ;current filename buffer same as that
BNE CKEXCRTN ;for buffer belonging to EXEC.
LDA EXECBUFF+1 ;Maybe - low-bytes matched,
CMP A3L+1 ;so now check hi bytes of addr.
BEQ CKEXCRTN ;Exec buffer = current buffer.
NOTEXCBF DEX ;Not EXECing, DEX to make sure z-flag off.
(A7C2) ;(P.S. (x) was orig set to large non-zero
;val on entry to GETFNBF1. There4, if now
;DEX, can be sure z-flag will be off.)
CKEXCRTN RTS ;Exit with: z-flag = 1 if execing.
(A7C3) ; = 0 if not execing.
(A2FF) BNE FREEBUFF ;Not EXECing from this particular file.
LDA #0 ;Closing an exec file so shut
STA EXECFLAG ;off the exec flag.
FREEBUFF LDY #0 ;Free up the DOS buffer by poking a $00 in
TYA ;1rst byte of filename.
STA (A3L),Y
(A30B) JSR BUFS2PRM
* GET addresses of the DOS buffers from chain
* buffer & put them in FM parameter list.
(A74E)
BUFS2PRM LDY #30 ;Get addresses of FM Work buffer,
ADRINPRM LDA (A3L),Y ;T/S list buffer, Data sec buffer and
STA WRKBUFFM-30,Y ;NEXT filename buf from the chain ptr
INY ;buf & put them in the FM parameter list.
CPY #38 ;(P.S. Addr of NEXT filename buffer is not
BNE ADRINPRM ;used by DOS.)
(A75A) RTS
(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 buf from FM parm
* 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 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.)