****************************************************************** * * * 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 in name. (A2EF) BEQ CLOSEALL ;Leading = 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.)