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Assembly Source File | 1986-08-22 | 27.0 KB | 632 lines

PAGE ,132 TITLE IBM-PC Cluster Owner Program, Version 1.40, 21-Aug-1986 ; ; Written By Steven Georgiades ; ; IBM-PC/XT Cluster Owner Program ; Will respond with the name of the file that owns the specified cluster. ; ; If you are using this program and find it of value, your ; contribution in any amount ($5.00 suggested) will be greatly ; appreciated. Makes checks payable to Steven M. Georgiades. ; Thank you. ; ; If you have any questions or comments about this or any other ; SMG program, call or write: ; ; Steven M. Georgiades ; 701-H South Hayward Street ; Anaheim, CA 92804 ; (714) 826-9549 ; CODE SEGMENT BYTE PUBLIC 'CODE' ASSUME CS:CODE,DS:CODE,ES:CODE,SS:CODE ORG 5CH FCB LABEL BYTE ORG 80H PARAM LABEL BYTE ORG 100H OWNER: JMP BEGIN CRLF DB 13,10,"$" DIGIT DB "0123456789ABCDEF" READERR DB "Error Reading Drive X:",7,13,10,"$" SIGNON DB "Owner, Version 1.40",13,10,10,"$" CLUSTMSG DB "Cluster XXXXX $" OWNERMSG DB "is Owned by $" BADMSG DB "is Marked as Bad",13,10,"$" FREEMSG DB "is not is Use by any File",13,10,"$" INVALID DB "does not Exist!",7,13,10,"$" LOSTMSG DB "Appears to be Lost!",7,13,10,"$" RESVMSG DB "is Reserved",13,10,"$" CLSTSEC DW ? CLSTTOT DW ? CLUST DW ? DIR_LEN DW ? DIRBUF DW ? DIRSEC DW ? DRIVE DB ? EOF DW 0FF8H FATSEC DW ? FATSIZE DB 3 RDIR_LEN DW ? SECSIZE DW ? STARTSEC DW ? DIRNAME DB 14 DUP(0) FILESPEC DB "X:\" PATH DB "$",79 DUP(0) FILENAME DB 14 DUP(0) BEGIN: MOV AH,9 ; Output Sign-On Message MOV DX,OFFSET SIGNON INT 21H MOV AH,19H ; Get Default Drive Number INT 21H MOV DRIVE,AL ; and Save MOV SI,OFFSET PARAM ; Set up Pointer to Parameter LODSB ; Read Parameter Length CBW MOV BX,AX MOV BYTE PTR [SI][BX],0 ; Terminate Parameter String STRIP: LODSB ; Strip Off Leading Whitespace CMP AL,' ' JE STRIP CMP AL,9 JE STRIP OR AL,AL ; If End-of-Parameter, JZ RD_BOOT ; Continue Proccessing CMP AL,'/' ; If Switch, Process JE SWITCH DEC SI ; ReUse Last Character CALL GET_WORD ; Read Cluster Number (Hex) MOV CLUST,DX ; Save Cluster Number JMP SHORT STRIP ; Get Next Parameter SWITCH: LODSB ; Get Drive Letter SUB AL,'A' ; Convert to Drive Number MOV DRIVE,AL ; Save Drive Number JMP SHORT STRIP ; Get Next Paramter RD_BOOT: MOV AL,DRIVE ; Read Boot Record MOV CX,1 MOV DX,0 MOV BX,OFFSET FATBUF INT 25H JNC BOOT_OK JMP RDERROR ; If Error, Say So BOOT_OK: POPF MOV AX,FATBUF[11] ; Read Sector Size MOV SECSIZE,AX ; and Save MOV AL,BYTE PTR FATBUF[13] ; Read Sectors per Cluster XOR AH,AH MOV CLSTSEC,AX ; and Save MOV CX,FATBUF[14] ; Read # of Reserved Sectors MOV AL,BYTE PTR FATBUF[16] ; Read # of FAT's XOR AH,AH ; Convert to Word MOV BX,FATBUF[22] ; Read Sectors per FAT MOV FATSEC,BX MUL BX ; Calculate Total FAT Sectors ADD CX,AX ; Add to Reserved Sectors MOV AX,FATBUF[17] ; Read Number of DIR Entries MOV RDIR_LEN,AX PUSH CX ; Calculate DIR Sectors MOV CL,5 SHL AX,CL POP CX MOV BX,SECSIZE XOR DX,DX DIV BX OR DX,DX ; Adjust for Partial Sector JZ NO_ADD INC AX NO_ADD: MOV DIRSEC,AX ; Save DIR Sectors ADD CX,AX ; Add DIR Sectors to Reserved MOV STARTSEC,CX ; Save in STARTSEC MOV AX,FATSEC ; Determine FAT Buffer Size MOV BX,SECSIZE MUL BX ADD AX,OFFSET FATBUF MOV DIRBUF,AX ; Save DIRBUF Pointer MOV AX,FATBUF[19] ; Read Total Sectors on Media SUB AX,CX ; Calculate Total Data Clusters MOV BX,CLSTSEC XOR DX,DX DIV BX ADD AX,2 MOV CLSTTOT,AX ; and Save CMP AX,4081 ; If Necessary, Adjust FAT Size JLE FAT_OK MOV FATSIZE,4 MOV EOF,0FFF8H FAT_OK: MOV AL,DRIVE ; Read FAT MOV CX,FATSEC MOV DX,1 MOV BX,OFFSET FATBUF INT 25H JC RDERROR ; If Error, Say So POPF MOV BX,CLUST ; Get Cluster Number MOV AX,BX ; Convert Cluster # to Decimal MOV DI,OFFSET CLUSTMSG[13] CALL DEC5OUT CALL STRIP0 ; Strip Off Leading Zeroes MOV AH,9 MOV DX,OFFSET CLUSTMSG ; Output Cluster Message INT 21H CMP BX,CLSTTOT ; Test Cluster Number JNB CLSTBAD CMP BX,2 JNB CLST_OK CLSTBAD: MOV DX,OFFSET INVALID ; If Invalid, Say So JMP SHORT ERROUT CLST_OK: CALL NEXTCLST ; Determine Next Cluster OR BX,BX ; If Not in Use, Say So JNZ NOT_FREE MOV DX,OFFSET FREEMSG JMP SHORT ERROUT NOT_FREE: MOV AX,EOF ; If In Use, Continue CMP BX,AX JAE CLSTGOOD DEC AX ; If Bad, Say So CMP BX,AX JNE NOT_BAD MOV DX,OFFSET BADMSG JMP SHORT ERROUT NOT_BAD: SUB AX,7 ; If Reserved, Say So CMP BX,AX JB CLSTGOOD MOV DX,OFFSET RESVMSG ERROUT: MOV AH,9 ; Output Error Message INT 21H MOV AX,4C01H ; Exit to DOS INT 21H RDERROR: POPF ; Handle Read Error MOV AL,DRIVE ADD AL,'A' MOV READERR[20],AL MOV DX,OFFSET READERR JMP SHORT ERROUT CLSTGOOD: MOV AX,CLUST ; Get Cluster Number CLSTBACK: MOV BX,AX ; Get Previous Cluster in Chain CALL PREVCLST OR AX,AX ; If Not First, Repeat JNZ CLSTBACK MOV CLUST,BX ; Save First Cluster in Chain LOOKHERE: CALL GETDIR ; Load the Current Directory CALL SRCHCLST ; Search Directory for Cluster JNC FOUND ; If Found, Exit Search Loop CALL SRCHDIR ; Search Dir for Sub-Directory JNC LOOKHERE ; If Found, Continue Search Loop CALL DIRNEXT ; Use Next Sub-Directory JNC LOOKHERE ; If Found, Continue Search Loop MOV DX,OFFSET LOSTMSG ; Else Couldn't find Cluster JMP ERROUT FOUND: MOV AL,DRIVE ; Convert Drive Number to Letter ADD AL,'A' MOV FILESPEC,AL MOV AH,9 ; Output Owner Message MOV DX,OFFSET OWNERMSG INT 21H MOV DX,OFFSET FILESPEC ; Output FileSpec INT 21H MOV DX,OFFSET FILENAME ; Output FileName INT 21H MOV DX,OFFSET CRLF INT 21H EXIT: MOV AX,4C00H ; Exit to DOS INT 21H DIRNEXT: PUSH AX ; Save Registers PUSH BX PUSH CX PUSH DI PUSH SI DIRNEXT1: MOV DI,OFFSET PATH ; Scan to End of Path MOV CX,80 MOV AL,'$' REPNE SCASB JNE DIRNEXT3 ; If No End, Error CMP CX,79 ; If Null Path, Error JE DIRNEXT3 STD ; Auto-Decrement MOV AX,78 ; Determine Path Length SUB AX,CX MOV CX,AX SUB DI,2 ; Point to End of DirName MOV AL,0 ; Set End of DirName STOSB MOV AL,'\' ; Scan to Previous DirName REPNE SCASB JE DIRNEXT2 ; If Not Found, MOV DI,OFFSET PATH[-2] ; Point to Start of Path DIRNEXT2: CLD ; Auto-Increment ADD DI,2 ; Copy Last SubDir to FileName PUSH DI MOV SI,DI MOV DI,OFFSET FILENAME CALL MOVSTR POP DI MOV AL,'$' ; Terminate Path String STOSB CALL GETDIR ; Read Directory JC DIRNEXT4 ; If Error, Say So MOV SI,OFFSET FILENAME MOV DI,OFFSET DIRNAME CALL MOVSTR CALL SRCHFILE ; Search for FileName JC DIRNEXT4 ; If Error, Say So MOV SI,BX ; Save Pointer ADD SI,32 ; Point to Next Dir Entry MOV AX,SI ; Determine Dir Entry Count SUB AX,DIRBUF MOV CL,5 SHR AX,CL MOV CX,DIR_LEN SUB CX,AX CALL FINDDIR ; Find Next SubDirectory JC DIRNEXT1 JMP SHORT DIRNEXT4 DIRNEXT3: STC ; Set Error Return Flag DIRNEXT4: POP SI ; Restore Registers POP DI POP CX POP BX POP AX RET ; Done GETDIR: PUSH AX ; Save Registers PUSH BX PUSH CX PUSH DX PUSH DI PUSH SI MOV AL,DRIVE ; Read Root Directory MOV CX,DIRSEC MOV DX,STARTSEC SUB DX,CX MOV BX,DIRBUF INT 25H POPF MOV AX,RDIR_LEN ; DIR Length = Root DIR Length MOV DIR_LEN,AX MOV SI,OFFSET PATH ; Point to First Element of Path GETDIR1: MOV DI,OFFSET DIRNAME ; Point to FileName Buffer GETDIR2: LODSB ; Copy Path Element to FileName CMP AL,'\' ; until '\' or '$' JE GETDIR3 CMP AL,'$' JE GETDIR4 STOSB JMP SHORT GETDIR2 GETDIR3: MOV AL,0 ; Read Subdirectory STOSB CALL READDIR JC GETDIR5 ; If Error, Say So JMP SHORT GETDIR1 ; Get Next Element GETDIR4: CLC ; Clear Error Flag GETDIR5: POP SI ; Restore Registers POP DI POP DX POP CX POP BX POP AX RET ; Done READDIR: PUSH CX ; Save Registers PUSH DI PUSH SI CALL SRCHFILE ; Search for DIR JC READDIR2 ; If Not Found, Error MOV BX,[BX+26] ; Get Starting Cluster Number MOV DIR_LEN,0 ; DIR Length = 0 OR BX,BX ; If Start Cluster = 0, Error JZ READDIR2 MOV AX,SECSIZE ; Calculate DIR Entries/Cluster MOV CX,CLSTSEC MUL CX MOV CL,5 SHR AX,CL MOV CX,AX MOV DI,DIRBUF ; Point to DIR Buffer READDIR1: CALL READCLST ; Read Cluster ADD DIR_LEN,CX ; Increment DIR Length CMP BX,EOF ; If Not Last Cluster, JB READDIR1 ; Get Next Cluster JMP SHORT READDIR3 ; Done Reading DIR READDIR2: STC ; Set Error Flag READDIR3: POP SI ; Restore Registers POP DI POP CX RET ; Done SRCHDIR: PUSH CX ; Save Registers PUSH SI MOV SI,DIRBUF ; Point to First DIR Entry MOV CX,DIR_LEN ; Load DIR Length CALL FINDDIR ; Find SubDirectory POP SI ; Restore Registers POP CX RET ; Done FINDDIR: PUSH AX ; Save Registers PUSH DI FINDDIR1: JCXZ FINDDIR4 ; If Zero, Not Found FINDDIR2: CMP BYTE PTR [SI],'.' ; If '.' or '..', Skip JE FINDDIR3 CMP BYTE PTR [SI],0E5H ; If Deleted, Skip JE FINDDIR3 TEST BYTE PTR [SI+11],10H ; Test File Attribute JNZ FINDDIR5 ; If Match, Found FINDDIR3: ADD SI,32 ; Else Next DIR Entry LOOP FINDDIR2 ; and Repeat FINDDIR4: STC ; Set Error Flag JMP SHORT FINDDIR6 ; Done FINDDIR5: MOV DI,OFFSET DIRNAME CALL UNPARSE ; UnParse Directory Name MOV DI,OFFSET PATH ; Search for End of Path MOV AL,'$' MOV CX,80 REPNE SCASB JNE FINDDIR4 ; If Not Found, Error DEC DI MOV BX,SI ; Set Pointer to DIR Entry MOV SI,OFFSET DIRNAME ; Copy Directory Name to Path CALL MOVSTR DEC DI MOV AX,'$\' ; Terminate Path STOSW CLC ; Clear Error Flag FINDDIR6: POP DI ; Restore Registers POP AX RET ; Done SRCHFILE: PUSH AX ; Save Register PUSH CX PUSH DI PUSH SI MOV AX,2900H ; Parse Filename MOV SI,OFFSET DIRNAME MOV DI,OFFSET FCB INT 21H INC DI ; Point to Filename in FCB MOV SI,DIRBUF ; Point to Start of DIRBUF MOV CX,DIR_LEN ; Load DIR Length JCXZ SRCHFIL2 ; If Zero, Not Found SRCHFIL1: PUSH CX ; Save Registers PUSH DI PUSH SI MOV CX,11 ; Compare Filename REPE CMPSB POP SI ; Restore Registers POP DI POP CX JE SRCHFIL3 ; If Match, Found ADD SI,32 ; Else Next DIR Entry LOOP SRCHFIL1 ; and Repeat SRCHFIL2: STC ; Set Error Flag JMP SHORT SRCHFIL4 ; Done SRCHFIL3: MOV BX,SI ; Set Pointer to DIR Entry CLC ; Clear Error Flag SRCHFIL4: POP SI ; Restore Registers POP DI POP CX POP AX RET ; Done SRCHCLST: PUSH AX ; Save Register PUSH CX PUSH DI PUSH SI MOV SI,DIRBUF ; Point to First DIR Entry MOV CX,DIR_LEN ; Load DIR Length JCXZ SRCHCLS3 ; If Zero, Not Found MOV BX,CLUST SRCHCLS1: CMP BYTE PTR [SI],'.' ; If '.' or '..', Skip JE SRCHCLS2 CMP BYTE PTR [SI],0E5H ; If Deleted, Skip JE SRCHCLS2 CMP BX,[SI+26] ; Compare Start Cluster Number JE SRCHCLS4 ; If Match, Found SRCHCLS2: ADD SI,32 ; Else Next DIR Entry LOOP SRCHCLS1 ; and Repeat SRCHCLS3: STC ; Set Error Flag JMP SHORT SRCHCLS5 ; Done SRCHCLS4: MOV DI,OFFSET FILENAME ; UnParse File Name CALL UNPARSE CLC ; Clear Error Flag SRCHCLS5: POP SI ; Restore Registers POP DI POP CX POP AX RET ; Done READCLST: PUSH AX ; Save Registers PUSH CX PUSH DX MOV AX,BX ; Calculate Absolute Sector # SUB AX,2 MOV CX,CLSTSEC MUL CX ADD AX,STARTSEC MOV DX,AX MOV AL,DRIVE PUSH BX ; Save Registers PUSH DI MOV BX,DI ; Read Cluster INT 25H POPF POP DI ; Restore Registers POP BX CALL NEXTCLST ; Get Next Cluster Number MOV AX,CLSTSEC ; Increment Buffer Pointer MOV CX,SECSIZE MUL CX ADD DI,AX POP DX ; Restore Registers POP CX POP AX RET ; Done PREVCLST: PUSH BX ; Save Registers PUSH CX PUSH DX MOV DX,BX ; Reserve Cluster Number MOV CX,CLSTTOT ; Start Looking at Last Cluster PREVCLS1: MOV BX,CX ; Check Cluster INC BX CALL NEXTCLST CMP BX,DX ; If Match, Use It LOOPNE PREVCLS1 ; Else Repeat JNE PREVCLS2 ; If No Match, Return Zero ADD CX,2 ; Adjust for Cluster Number PREVCLS2: MOV AX,CX ; AX = Cluster Number POP DX ; Restore Registers POP CX POP BX RET ; Done NEXTCLST: CMP FATSIZE,3 ; If FAT Size = 16 Bits, JE NEXTCLS1 SHL BX,1 ; Simply Read Next Cluster # MOV BX,FATBUF[BX] RET ; Done NEXTCLS1: PUSH AX ; Save Registers PUSH CX MOV AX,BX ; Word # = Cluster # * 1.5 SHL AX,1 ADD BX,AX SHR BX,1 MOV BX,FATBUF[BX] JNC NEXTCLS2 ; If Odd, Use 12 MSB's MOV CL,4 SHR BX,CL NEXTCLS2: AND BX,0FFFH ; Else Use 12 LSB's POP CX ; Restore Registers POP AX RET ; Done UNPARSE: PUSH CX ; Save Registers PUSH DI PUSH SI MOV CX,8 ; FileName Length = 8 Max UNPARSE1: LODSB ; Read Character CMP AL,' ' ; If Space, Exit Loop JE UNPARSE2 STOSB ; Move Character LOOP UNPARSE1 ; Repeat UNPARSE2: MOV AL,'.' ; Put a Dot in the String STOSB POP SI ; Point to Extension PUSH SI ADD SI,8 MOV CX,3 ; Extension Length = 3 Max UNPARSE3: LODSB ; Read Character CMP AL,' ' ; If Space, Exit Loop JE UNPARSE4 STOSB ; Move Character LOOP UNPARSE3 ; Repeat UNPARSE4: CMP CX,3 ; If No Extension, Remove Dot JNE UNPARSE5 DEC DI UNPARSE5: MOV AL,0 ; Terminate FileName STOSB MOV AL,'$' STOSB POP SI ; Restore Registers POP DI POP CX RET ; Done MOVSTR: LODSB ; Read Source STOSB ; Write Destination OR AL,AL ; If Not EOS, Repeat JNZ MOVSTR RET ; Done GET_WORD: PUSH BX ; Save Register XOR DX,DX ; Value = 0 GET_WRD1: LODSB ; Read Character CMP AL,'0' ; If Not Numeric, Done JB GET_WRD2 CMP AL,'9' JA GET_WRD2 SUB AL,'0' ; Convert to BCD CBW MOV BX,AX ; Value = Value*10+BCD MOV AX,10 MUL DX ADD AX,BX MOV DX,AX JMP GET_WRD1 ; Repeat GET_WRD2: DEC SI POP BX ; Restore Register RET ; Done STRIP0: CMP BYTE PTR [DI],'0' ; If Character != '0', Done JNE STRIP1 CMP BYTE PTR [DI+1],'0' ; If Next Character != Digit, JL STRIP1 ; Done CMP BYTE PTR [DI+1],'9' JG STRIP1 MOV BYTE PTR [DI],' ' ; Change '0' to ' ' INC DI ; Point to Next Character JMP SHORT STRIP0 ; Repeat STRIP1: RET ; Done DEC2OUT: PUSH AX ; Save Registers PUSH BX XOR AH,AH ; Clear AH MOV BL,10 ; AH=AX%10,AL=AX/10 DIV BL ADD AX,'00' ; Convert to ASCII SUB DI,2 MOV [DI],AX ; Store in String POP BX ; Restore Registers POP AX RET ; Done DEC4OUT: PUSH AX ; Save Registers PUSH BX MOV BL,100 ; AH=AX%100,AL=AX/100 DIV BL XCHG AH,AL ; Convert 2 LSD's CALL DEC2OUT XCHG AH,AL ; Convert 2 MSD's CALL DEC2OUT POP BX ; Restore Registers POP AX RET ; Done DEC5OUT: PUSH AX ; Save Registers PUSH BX PUSH DX ; DX=AX%10000,AX=AX/10000 MOV BX,10000 XOR DX,DX DIV BX XCHG DX,AX ; Convert 4 LSD's CALL DEC4OUT XCHG DX,AX ; Convert MSD ADD AL,'0' SUB DI,1 MOV [DI],AL POP DX ; Restore Registers POP BX POP AX RET ; Done FATBUF LABEL WORD CODE ENDS END OWNER