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Assembly Source File | 1991-06-24 | 62KB | 1,241 lines

;============================================================================= ; BCOPY 1.01 Background copy utility ; ; Revision History ; ; 1.0 Initial Release ; 1.01 Fixed bug in DTA restore code. Jan. 8 1989 DMB ; 1.02 Fixed bug in queue load code. Feb. 7 1989 DMB ; ;============================================================================= CODE SEGMENT PARA PUBLIC 'CODE' ASSUME CS:CODE ORG 80H COMMAND_TAIL DB ? ORG 100H BEGIN: JMP INITIALIZE PROGRAM DB "BCOPY 1.02 (c) 1989 Ziff Communications Co.",13,10 DB "PC Magazine ",254," Douglas Boling",13,10 DB "Usage: BCOPY [source [target]][/X][/U]$",26 ;----------------------------------------------------------------------------- ; Memory locations required for system overhead. ;----------------------------------------------------------------------------- INDOS DD 0 ;pointer to INDOS flag CEF_PTR DD 0 ;pointer to Critical err flag DOS_VERSION DW 0 ;DOS version number COUNTER DB 16 ;request flag/timer DISKFLAG DB 0 ;disk access flag ACTIVE DB 0 ;background status flag REMOVE_FLAG DB 0 ;1 = uninstall when q empty RET_ADDR DW 0 ;saved return addr for calls SOURCE_HNDL DW 0 ;Source file handle DEST_HNDL DW 0 ;Destination handle EMS_FLAG DB 0 ;Use expanded memory EMS_HANDLE DW 0 ;EMS handle used DATA_SEGMENT DW 0 ;segment of data buffer QUEUE_HEAD_PTR DW 0 ;pointer to first file in q FILE_COUNT DB 0 ;Number of files in queue DATA_BUFF_START DW OFFSET DATA_BUFFER ;pointer to start of buffer DATA_BUFF_END DW OFFSET END_OF_DATA ;pointer to end of data buffer INT8H DD 0 ;int 8h vector (Timer) INT13H DD 0 ;int 13h vector (Disk) INT28H DD 0 ;int 28h vector (Idle) SAVED_DTA DD 0 ;saved pointer to curr DTA SAVED_PSP DW 0 ;saved segment of curr PSP SS_REGISTER DW 0 ;SS register SP_REGISTER DW 0 ;SP register ERRINFOARRAY DW 6 DUP (0) ;Saved extended error info ERRINFODS DW 0 ERRINFOES DW 0 DW 3 DUP (0) ;Reserved error table bytes VECTOR1BH DD 0 ;int 1Bh vector (Break) VECTOR23H DD 0 ;int 23h vector (Ctrl-C) VECTOR24H DD 0 ;int 24h vector (Crit err) ;============================================================================= ; TIMERINT receives control when an interrupt 8 is generated. ;============================================================================= TIMERINT PROC FAR ASSUME CS:CODE,DS:NOTHING,ES:NOTHING PUSHF ;call BIOS routine CALL INT8H CLI ;make sure interrupts are off CMP CS:COUNTER,0 ;exit if timer not expired JG DECTIME CMP CS:ACTIVE,0 ;See if already active. JNE TIMER_EXIT CMP CS:DISKFLAG,0 ;check disk access status JNE TIMER_EXIT ;exit if disk active. PUSH ES PUSH DI LES DI,INDOS ;retrieve INDOS address CMP BYTE PTR ES:[DI],0 ;is the INDOS flag clear? POP DI POP ES JNE TIMER_EXIT CMP CS:FILE_COUNT,0 ;See if any files in queue JNE TIMER_CONTINUE CMP CS:REMOVE_FLAG,0 ;See if routine should be JE TIMER_EXIT ; removed from memory CALL REMOVE JNC TIMER_EXIT ;If no error, exit. If error, JMP SHORT TIMER_SKIP_MAIN ; wait then try again. TIMER_CONTINUE: CALL MAIN ;yes, invoke background routine TIMER_SKIP_MAIN: MOV CS:COUNTER,17 ;Set sleep counter = 1 sec DECTIME: DEC CS:COUNTER ;decrement wait counter TIMER_EXIT: IRET TIMERINT ENDP ;============================================================================= ; IDLE receives control when an interrupt 28h is generated. ;============================================================================= IDLE PROC FAR ASSUME CS:CODE,DS:NOTHING,ES:NOTHING PUSHF ;call DOS routine CALL INT28H CLI ;make sure interrupts are off CMP CS:FILE_COUNT,0 ;See if files in queue JE IDLE_EXIT ;If not, exit. CMP CS:COUNTER,8 ;wait at least 1/2 sec between JA IDLE_EXIT ; calls. CMP CS:ACTIVE,0 ;See if already active. JNE IDLE_EXIT CMP CS:DISKFLAG,0 ;check disk access status JNE IDLE_EXIT ;exit if flag is raised PUSH ES PUSH DI LES DI,CS:CEF_PTR ;retrieve crit err flag adr CMP BYTE PTR ES:[DI],0 ;is DOS in crit error state? POP DI POP ES JNE IDLE_EXIT ;yes, don't do anything CALL MAIN ;Call background routine. MOV CS:COUNTER,16 ;Set sleep counter IDLE_EXIT: IRET IDLE ENDP ;============================================================================= ; DISKINT receives control when an interrupt 13h is generated. ;============================================================================= DISKINT PROC FAR ASSUME CS:CODE,DS:NOTHING,ES:NOTHING PUSHF ;save flags register INC CS:DISKFLAG ;set disk access flag POPF ;restore flags PUSHF ;call BIOS routine CALL INT13H PUSHF ;save flags again DEC CS:DISKFLAG ;reset disk access flag POPF ;restore flags RET 2 ;exit with flags intact DISKINT ENDP ;============================================================================= ; CRITICALERR receives control when an interrupt 24h is generated. ;============================================================================= CRITICALERR PROC FAR ASSUME CS:CODE,DS:NOTHING,ES:NOTHING XOR AL,AL ;Default to ignore CMP CS:DOS_VERSION,30AH ;See if before DOS 3.1 JL CRITICAL1 ADD AL,3 CRITICAL1: IRET CRITICALERR ENDP ;============================================================================= ; MAIN ;============================================================================= MAIN PROC NEAR ASSUME CS:CODE,DS:NOTHING,ES:NOTHING INC CS:[ACTIVE] ;set program status flag CLI ;make sure interrupts are off MOV CS:SS_REGISTER,SS ;save SS and SP registers MOV CS:SP_REGISTER,SP PUSH CS ;switch to internal stack POP SS MOV SP,OFFSET STACK_SPACE STI ;enable interrupts CALL SAVE_REGS ;save all registers ASSUME DS:CODE ;----------------------------------------------------------------------------- ;Point the interrupt 1Bh, 23h, and 24h vectors to internal handlers. ;----------------------------------------------------------------------------- MOV AX,351BH ;get and save 1Bh vector INT 21H MOV WORD PTR VECTOR1BH,BX MOV WORD PTR VECTOR1BH[2],ES MOV AX,251BH ;point interrupt to IRET MOV DX,OFFSET IDLE_EXIT INT 21H MOV AX,3523H ;get and save 23h vector INT 21H MOV WORD PTR VECTOR23H,BX MOV WORD PTR VECTOR23H[2],ES MOV AX,2523H ;point interrupt to IRET MOV DX,OFFSET IDLE_EXIT INT 21H MOV AX,3524H ;get and save 24h vector INT 21H MOV WORD PTR VECTOR24H,BX MOV WORD PTR VECTOR24H[2],ES MOV AX,2524H ;point interrupt to internal PUSH CS POP DS MOV DX,OFFSET CRITICALERR ; critical error handler INT 21H ;----------------------------------------------------------------------------- ;Save and switch to internal PSP ;----------------------------------------------------------------------------- MOV AH,51H ;Get current PSP CALL DOSPSPCALL ;Beware DOS 2.0 - 3.0 MOV SAVED_PSP,BX ;save it PUSH CS POP BX MOV AH,50H ;Set internal PSP CALL DOSPSPCALL ;----------------------------------------------------------------------------- ;Save and switch to internal DTA ;----------------------------------------------------------------------------- MOV AH,2FH INT 21H ;Get current DTA MOV WORD PTR SAVED_DTA,BX ;save it MOV WORD PTR SAVED_DTA[2],ES MOV DX,OFFSET COMMAND_TAIL ;use PSP for DTA MOV AH,1AH ;Set DTA INT 21H ;----------------------------------------------------------------------------- ;If DOS >= 3.x, save extended error information. ;----------------------------------------------------------------------------- CMP WORD PTR DOS_VERSION,030AH JB SKIP_ERR_SAVE PUSH DS ;save DS XOR BX,BX ;clear BX for call MOV AH,59H ;Extended error info INT 21H ;Call DOS MOV CS:ERRINFODS,DS ;save returned ES POP DS ;Restore DS PUSH BX MOV BX,OFFSET ERRINFOARRAY ;Save data in registers MOV [BX],AX ; in this specific order. POP 2[BX] MOV 4[BX],CX MOV 6[BX],DX MOV 8[BX],SI MOV 0AH[BX],DI MOV 0EH[BX],ES SKIP_ERR_SAVE: ;----------------------------------------------------------------------------- ;If using EMS memory, save EMS mapping context and map our page. ;----------------------------------------------------------------------------- CMP EMS_FLAG,0 JE EMS_SAVE_SKIP MOV AH,47H ;Save mapping context MOV DX,EMS_HANDLE INT 67H OR AH,AH JNE JMP_CLEAN_UP MOV AX,4400H ;Map page XOR BX,BX MOV DX,EMS_HANDLE INT 67H OR AH,AH JNE JMP_CLEAN_UP EMS_SAVE_SKIP: MOV ES,DATA_SEGMENT MOV DS,DATA_SEGMENT ASSUME DS:NOTHING ;----------------------------------------------------------------------------- ;Check flags in queue to determine if starting a copy or in the middle of one. ;----------------------------------------------------------------------------- MOV SI,CS:QUEUE_HEAD_PTR ;Get pointer to filename MOV AX,[SI+2] ;Get source file flags OR AH,AH ;See if source file open JNE OPEN_DEST ;Yes, check destination file ;----------------------------------------------------------------------------- ;Search for source file. ;----------------------------------------------------------------------------- FIND_SOURCE: ADD SI,6 ;move pointer to filename MOV DX,SI ;Copy queue pointer XOR CX,CX ;Search for normal files. MOV AH,4EH ;assume find first OR AL,AL ;See if first search. JE FIND1ST ;Yes, find first. INC AH ;No, change cmd to find next. FIND1ST: INT 21H ;Call DOS JNC OPEN_FILE JMP PURGE_FROM_QUEUE ;If file not found, purge ;----------------------------------------------------------------------------- ;Attempt to open source file. ;----------------------------------------------------------------------------- OPEN_FILE: XOR DL,DL ;indicate source file CALL GETPATHFILE ;combine path and filename MOV DX,CS:DATA_BUFF_START ;point to filename MOV AX,3D00H ;open, read only access INT 21H JNC GOOD_OPEN ;error in file open. CMP AX,4 ;See if too many open files. JNE OPEN1 JMP_CLEAN_UP: JMP CLEAN_UP ;If so, try again later OPEN1: JMP PURGE_FROM_QUEUE ;Else, bad filename. GOOD_OPEN: MOV SOURCE_HNDL,AX ;Save handle for source file MOV SI,CS:QUEUE_HEAD_PTR ;Get queue ptr, indicate that MOV WORD PTR [SI+2],0101H ; 1st file opened. ;----------------------------------------------------------------------------- ;Create destination file. ; Note: open dest assumes SI points to the first entry in the queue. ;----------------------------------------------------------------------------- OPEN_DEST: MOV AX,[SI+4] ;Get destination file flags OR AL,AL ;See if destination file open JNE READ_FILE ;Dest file open, copy data. CALL GET_DEST_NAME ;Gen filename from queue MOV AH,3CH ;create destination file XOR CX,CX ;normal attributes INT 21H JNC GOOD_CREATE_DEST OPEN_DEST_ERR: CMP AX,4 ;See if too many files JE JMP_CLEAN_UP ;If so, wait till later JMP SHORT PURGE_FROM_QUEUE ;If other error, purge file GOOD_CREATE_DEST: MOV CS:DEST_HNDL,AX ;Save destination handle MOV SI,CS:QUEUE_HEAD_PTR ;Get pointer to filename MOV BYTE PTR [SI+4],1 ;Set destination file open ;----------------------------------------------------------------------------- ;Files are open, read from destination file into data buffer. ;----------------------------------------------------------------------------- READ_FILE: MOV CX,CS:DATA_BUFF_END ;Find end of buffer SUB CX,CS:DATA_BUFF_START ;Get size of buffer SUB CX,4 MOV BX,CS:SOURCE_HNDL ;Get handle MOV DX,CS:DATA_BUFF_START ;Point to data buffer MOV AH,3FH ;Read file INT 21H ;Call DOS JNC WRITE_FILE ;If no error, continue MOV DI,1 ;If error, close files, JMP SHORT CLOSE_FILES ; erase dest, and purge. ;----------------------------------------------------------------------------- ;Write data to file. ;----------------------------------------------------------------------------- WRITE_FILE: MOV SI,CX ;Save num of bytes requested MOV CX,AX ;Write number of bytes read. MOV AH,40H ;Write file MOV BX,CS:DEST_HNDL ;To destination INT 21H ;Call DOS JC WRITE_BAD XOR DI,DI ;Use DI as disk full flag CMP AX,CX ;Make sure all bytes written JE CHECK_FOR_EOF ;If not, disk full. WRITE_BAD: INC DI ;set flag to delete file JMP SHORT CLOSE_FILES ;----------------------------------------------------------------------------- ;If copy complete, close files ;----------------------------------------------------------------------------- CHECK_FOR_EOF: CMP SI,AX ;see if at end of file. JE CLEAN_UP ;No, skip close CLOSE_FILES: MOV SI,CS:QUEUE_HEAD_PTR ;Get queue ptr, indicate that MOV WORD PTR [SI+3],0 ;Indicate files closed. MOV BX,CS:SOURCE_HNDL MOV AH,3EH ;Close source file INT 21H MOV BX,CS:DEST_HNDL MOV AH,3EH ;Close destination file INT 21H OR DI,DI ;See if error during write. JE SHORT CLEAN_UP ; If so, delete and purge. CALL GET_DEST_NAME ;Gen dest file name again MOV AH,41H ;Delete partial dest file INT 21H ; (DX still points to name.) ;----------------------------------------------------------------------------- ;Purge file name from queue. ;----------------------------------------------------------------------------- PURGE_FROM_QUEUE: MOV DI,CS:QUEUE_HEAD_PTR ;Get queue pointer MOV SI,DS:[DI] ;Get pointer to next file PURGE_FILE_LOOP: CMP WORD PTR DS:[SI],0FFFFH ;See if good file JE PURGE_DONE MOV CX,DS:[SI] ;Compute length of entry SUB CX,SI MOV BX,DI ;save pointer to entry REP MOVSB ;Copy queue entry MOV DS:[BX],DI ;Update pointer JMP PURGE_FILE_LOOP PURGE_DONE: MOV WORD PTR DS:[DI],0FFFFH ;copy end pointer INC DI INC DI MOV CS:DATA_BUFF_START,DI ;Update start of data buffer. DEC CS:FILE_COUNT ;----------------------------------------------------------------------------- ;Clean up DOS for return to forground task. Start with extended error info. ;----------------------------------------------------------------------------- CLEAN_UP: PUSH CS POP DS ASSUME DS:CODE CMP WORD PTR DOS_VERSION,30AH JB SKIP_ERR_RESTORE MOV AX,5D0AH ;Restore ext error info MOV DX,OFFSET ERRINFOARRAY ;point to saved info INT 21H SKIP_ERR_RESTORE: ;----------------------------------------------------------------------------- ;If using EMS memory, restore EMS mapping context. ;----------------------------------------------------------------------------- CMP EMS_FLAG,0 JE EMS_RESTORE_SKIP MOV AH,48H ;Restore mapping context MOV DX,EMS_HANDLE INT 67H EMS_RESTORE_SKIP: ;----------------------------------------------------------------------------- ;Restore PSP and DTA ;----------------------------------------------------------------------------- MOV BX,SAVED_PSP ;Get old PSP MOV AH,50H ;Restore PSP CALL DOSPSPCALL PUSH DS LDS DX,[SAVED_DTA] MOV AH,1AH ;Restore DTA INT 21H ;----------------------------------------------------------------------------- ;Reset the displaced interrupt 1Bh, 23h, and 24h vectors. ;----------------------------------------------------------------------------- MOV AX,2524H ;reset int 24h vector LDS DX,CS:[VECTOR24H] INT 21H MOV AX,2523H ;reset int 24h vector LDS DX,CS:[VECTOR23H] INT 21H MOV AX,251BH ;reset int 1Bh vector LDS DX,CS:[VECTOR1BH] INT 21H POP DS ;----------------------------------------------------------------------------- ;Restore register values, switch back to original stack, and return to caller. ;----------------------------------------------------------------------------- MAIN_EXIT: CALL RESTORE_REGS ;Restore registers ASSUME DS:NOTHING CLI ;make sure interrupts are off MOV SS,CS:SS_REGISTER ;switch to original stack MOV SP,CS:SP_REGISTER STI ;interrupts on DEC CS:[ACTIVE] ;clear program status flag RET ;Return to interrupt routine MAIN ENDP ;----------------------------------------------------------------------------- ; GETPATHFILE copies the path from the queue and appends the filename from the ; DTA assumed to be at offset 80h. ; Entry: ES:SI - ASCIIZ path (can include filename.) ; DL - 0 = Source file, always append filename from DTA. ; 1 = Destination file, append filename only if path specified. ; Exit: CF clear - file opened. ; CF set - error on file open. ;----------------------------------------------------------------------------- GETPATHFILE PROC NEAR ASSUME CS:CODE PUSH AX MOV CX,75 ;Max length of string MOV DI,CS:DATA_BUFF_START ;Copy name to data buffer GETPATHFILE0: LODSB ;Get a byte STOSB ;Store a byte OR AL,AL ;are we at the end? JNE GETPATHFILE0 ;No, loop back OR DL,DL ;See if source or dest file JE GETPATHFILE1 CMP BYTE PTR ES:[DI-2],"\" ;Is the a path specification? JNE GETPATHFILE_EXIT ;No, don't append src filename GETPATHFILE1: STD ;scan backwards MOV CX,15 ;Find last \ in filename MOV AL,"\" DEC DI ;Back up before 0 REPNE SCASB CLD INC DI ;move DI past \ INC DI PUSH DS PUSH CS POP DS MOV SI,OFFSET COMMAND_TAIL+1EH MOV CX,13 ;copy filename found REP MOVSB POP DS GETPATHFILE_EXIT: POP AX RET GETPATHFILE ENDP ;----------------------------------------------------------------------------- ; GET DEST NAME creates the destination file name from the queue. ; Exit: DX - points to fully specified destination filename. ;----------------------------------------------------------------------------- GET_DEST_NAME PROC NEAR ASSUME CS:CODE MOV DI,CS:QUEUE_HEAD_PTR ;Get pointer to filename ADD DI,6 ;point to file names XOR AL,AL ;search for end of 1st name MOV CX,75 REPNE SCASB MOV SI,DI ;copy pointer MOV DL,1 ;indicate destination file CALL GETPATHFILE MOV DX,CS:DATA_BUFF_START ;point to filename RET GET_DEST_NAME ENDP ;----------------------------------------------------------------------------- ; DOSPSPCALL modifies critical error flag on PSP calls to DOS is using 2.x ;----------------------------------------------------------------------------- DOSPSPCALL PROC NEAR ASSUME CS:CODE CMP WORD PTR CS:[DOS_VERSION],30AH ;See if DOS < 3.1 JAE DOSPSPCALL_OK ;no, just call DOS PUSH DS PUSH DI LDS DI,CS:CEF_PTR ;retrieve crit err flag adr INC BYTE PTR [DI] ;Set DOS in crit error state POP DI POP DS INT 21H ;Call DOS PUSH DS PUSH DI LDS DI,CS:CEF_PTR ;retrieve crit err flag adr DEC BYTE PTR [DI] ;Set DOS in crit error state POP DI POP DS RET DOSPSPCALL_OK: INT 21H ;Call DOS RET DOSPSPCALL ENDP ;----------------------------------------------------------------------------- ; SAVEREGS saves all the registers used in the interrupt routines and sets DS. ;----------------------------------------------------------------------------- SAVE_REGS PROC NEAR POP CS:[RET_ADDR] ;Get address to return to PUSH AX ;save all registers PUSH BX PUSH CX PUSH DX PUSH BP PUSH SI PUSH DI PUSH DS PUSH ES PUSH CS ;Set DS = CS POP DS ASSUME DS:CODE JMP WORD PTR [RET_ADDR] ;Return SAVE_REGS ENDP ;----------------------------------------------------------------------------- ;RESTOREREGS restores register values. ;----------------------------------------------------------------------------- RESTORE_REGS PROC NEAR POP RET_ADDR ;Save return address POP ES ;restore registers POP DS ASSUME DS:NOTHING POP DI POP SI POP BP POP DX POP CX POP BX POP AX JMP WORD PTR CS:[RET_ADDR] ;Return RESTORE_REGS ENDP ;----------------------------------------------------------------------------- ; REMOVE deallocates the memory block addressed by ES and restores the ; interrupt vectors displaced on installation. ; Entry: ES - segment to release ; Exit: CF clear - program uninstalled ; CF set - can't uninstall ;----------------------------------------------------------------------------- REMOVE PROC NEAR ASSUME CS:CODE INC CS:ACTIVE CALL SAVE_REGS ;Save registers ASSUME DS:CODE ; ;Make sure none of the vectors has been altered. ; MOV AL,8 ;check interrupt 8 vector CALL CHECKVECTOR JNE REMOVE_ERROR MOV AL,13H ;check interrupt 13h vector CALL CHECKVECTOR JNE REMOVE_ERROR MOV AL,28H ;check interrupt 28h vector CALL CHECKVECTOR JNE REMOVE_ERROR ; ;If using EMS memory, release it. ; CMP EMS_FLAG,0 JE SKIP_REMOVE_EMS MOV AH,45H ;Deallocate pages MOV DX,EMS_HANDLE INT 67H OR AH,AH JNE REMOVE_ERROR SKIP_REMOVE_EMS: ; ;Release the memory occupied by the program. ; PUSH CS POP ES MOV AH,49H ;free memory given to INT 21H ; original program block JC REMOVE_ERROR ;branch on error ; ;Restore the interrupt 8, 13h, and 28h vectors. ; PUSH DS ;save DS ASSUME DS:NOTHING MOV AX,2508H ;restore interrupt 8 vector LDS DX,ES:[INT8H] INT 21H MOV AX,2513H ;restore interrupt 13h vector LDS DX,ES:[INT13H] INT 21H MOV AX,2528H ;restore interrupt 28h vector LDS DX,ES:[INT28H] INT 21H POP DS ;restore DS ASSUME DS:CODE ; ;Destroy the ASCII fingerprint that identifies the code and exit. ; NOT WORD PTR [BEGIN] ;destroy fingerprint CLC ;clear CF for exit REMOVE_EXIT: DEC ACTIVE CALL RESTORE_REGS RET ;exit with CF intact ; ;The program can't be uninstalled. Set CF and exit. ; REMOVE_ERROR: STC JMP REMOVE_EXIT REMOVE ENDP ;----------------------------------------------------------------------------- ; CHECKVECTOR is called by REMOVE to compare the segment pointed to by an ; interrupt vector against a segment value supplied by the caller. ; Entry: AL - interrupt number ; Exit: ZF clear - segments do not match ; ZF set - segments match ;----------------------------------------------------------------------------- CHECKVECTOR PROC NEAR PUSH CS POP CX MOV AH,35H ;get vector INT 21H MOV AX,ES ;transfer segment to AX CMP AX,CX ;compare RET CHECKVECTOR ENDP ;----------------------------------------------------------------------------- ; FINALINSTALL is called to setup the data queue and to TSR. ;----------------------------------------------------------------------------- FINALINSTALL PROC NEAR ASSUME CS:CODE,DS:CODE,ES:CODE MOV DI,[QUEUE_HEAD_PTR] MOV ES,DATA_SEGMENT MOV SI,OFFSET END_OF_CODE ;point to filenames CALL PUTINQUEUE ;Load files in queue MOV DATA_BUFF_START,DI ;Set start of data buffer INC FILE_COUNT ;Inc file count ; ;Terminate and remain resident in memory. ; DEC ACTIVE ;allow background task MOV AX,3100H ;terminate with ERRORLEVEL = 0 MOV DX,(OFFSET END_OF_DATA-OFFSET CODE+15) SHR 4 CMP EMS_FLAG,0 JE FINAL_INSTALL1 MOV DX,(OFFSET DATA_BUFFER-OFFSET CODE+15) SHR 4 FINAL_INSTALL1: INT 21H FINALINSTALL ENDP ;----------------------------------------------------------------------------- ; PUTINQUEUE is called copy the fully qualified filenames into the queue. ; Entry: ES:DI - Points to open entry in queue. ; DS:SI - Points to entry to put in queue. ;----------------------------------------------------------------------------- PUTINQUEUE PROC NEAR ASSUME CS:CODE,DS:CODE MOV BX,DI ;save pointer MOV DX,2 ;move two asciiz strings ADD DI,DX ;move past pointer XOR AX,AX STOSW ;initialize file flags STOSW COPY_LOOP1: LODSB ;Copy filename STOSB CMP AL,0 JNE COPY_LOOP1 DEC DL ;decriment name counter JNE COPY_LOOP1 MOV ES:[BX],DI ;point to next available MOV WORD PTR ES:[DI],0FFFFH ; space in queue INC DI INC DI RET PUTINQUEUE ENDP ;============================================================================= ; Buffer space to be used once the program is resident. ;============================================================================= PC = $ PC = PC + 256 STACK_SPACE = PC ;stack for resident routine DATA_BUFFER = PC ;Buffer for data PC = PC + 4096 END_OF_DATA = PC ;============================================================================= ; INITIALIZE ;============================================================================= ERRMSG1 DB "Source file not found$" ERRMSG2 DB "Bad target path$" ERRMSG3 DB "Can't install$" ERRMSG4 DB "Dup. file names$" ERRMSG5 DB "Bad Switch$" ERRMSG6 DB "(Already installed)$" ERRMSG7 DB "EMS driver error$" ERRMSG8 DB "Deinstall queued$" OTHER_SEG DW 0 ;Segment of installed code ALRDY_INSTALLED DB 0 ;bcopy already installed flag DEF_DISK DB ? ;Default disk drive EMS_HEADER DB "EMMXXXX0" ;EMS driver header INITIALIZE PROC NEAR ASSUME CS:CODE, DS:CODE MOV DX,OFFSET PROGRAM CALL MESSAGE CLD ;clear DF ;----------------------------------------------------------------------------- ;Get DOS version. ;----------------------------------------------------------------------------- MOV AH,30H ;Get DOS version INT 21H XCHG AL,AH ;Put version in proper order MOV DOS_VERSION,AX ;Save DOS version ;----------------------------------------------------------------------------- ;Get default disk drive. ;----------------------------------------------------------------------------- MOV AH,19H ;Get default disk INT 21H INC AL MOV DEF_DISK,AL ;----------------------------------------------------------------------------- ;See if a copy is already resident in memory. If no copy, install. ;----------------------------------------------------------------------------- NOT WORD PTR [BEGIN] ;initialize fingerprint MOV BX,600H ;zero BX for start MOV AX,CS ;keep CS value in AX FIND_COPY: INC BX ;increment search segment value MOV ES,BX CMP AX,BX ;not installed if current JE FIND_COPY1 ; segment is looped back to MOV SI,OFFSET BEGIN ;search this segment for ASCII MOV DI,SI ; fingerprint MOV CX,16 REPE CMPSB JNE FIND_COPY ;loop back if not found INC ALRDY_INSTALLED ;Clear installed flag MOV DX,OFFSET ERRMSG6 CALL MESSAGE FIND_COPY1: INC ES:[ACTIVE] ;Don't let background active MOV OTHER_SEG,ES ;save installed code segment PUSH CS POP ES ;----------------------------------------------------------------------------- ;Parse the command line for remove and Expanded memory switches. ;----------------------------------------------------------------------------- MOV DI,OFFSET COMMAND_TAIL ;Point SI to command line text MOV CL,[DI] ;Get length of command line. OR CL,CL JNZ SWITCHES JMP TERMINATE SWITCHES: XOR CH,CH INC DI PUSH CX ;Save pointer for later use. PUSH DI SWITCHES1: MOV AL,"/" ;Put switch in AL REPNE SCASB ;Scan for cmd line switches JNE PARSE MOV AH,[DI] AND AH,0DFH ;Convert to caps CMP AH,"U" ;See if uninstall switch JE SWITCHES2 CMP AH,"X" ;See if expanded memory switch JE SWITCHES3 MOV DX,OFFSET ERRMSG5 ;Illegal switch ADD SP,4 ;Clean up stack JMP DISP_ERROR SWITCHES2: PUSH ES MOV ES,OTHER_SEG INC ES:[REMOVE_FLAG] ;Set uninstall flag POP ES MOV DX,OFFSET ERRMSG8 CALL MESSAGE JMP SWITCHES1 SWITCHES3: CMP ALRDY_INSTALLED,0 JE SWITCHES4 MOV DX,OFFSET ERRMSG5 CALL MESSAGE JMP SWITCHES1 SWITCHES4: INC EMS_FLAG ;Set expanded memory flag JMP SWITCHES1 ;----------------------------------------------------------------------------- ;Parse the command line and create a complete filespec. ;----------------------------------------------------------------------------- PARSE: POP SI ;Get back pointer to cmd line POP CX MOV DI,OFFSET END_OF_CODE ;save fully specified name CALL PARSE_FILENAME ; in a safe place. PUSH DI ;save 2nd file pointer DEC SI CALL PARSE_FILENAME ;process 2nd filename POP SI ;----------------------------------------------------------------------------- ;Verify that source file exists. ;----------------------------------------------------------------------------- MOV DX,OFFSET END_OF_CODE ;point to source filename MOV CX,00 ;normal file search MOV AH,4EH ;Find first INT 21H MOV DX,SI ;get 2nd file pointer JNC VERIFY_DEST MOV DX,OFFSET ERRMSG1 ;File not found JMP DISP_ERROR ;Print error msg and terminate ;----------------------------------------------------------------------------- ;Determine if the destination specification is a path or a complete filename. ;See if path by setting default path to destination. ;----------------------------------------------------------------------------- VERIFY_DEST: PUSH DX MOV DX,[SI] ;Get destination disk MOV SI,OFFSET END_OF_CODE + 300 MOV [SI],DX ;Save current path in MOV BYTE PTR [SI+2],"\" ; safe place. ADD SI,3 SUB DL,40H ;Convert to hex MOV AH,47H ;Get current directory INT 21H POP DX JC VERIFY_ERROR MOV AH,3BH ;Set path to destination INT 21H JC VERIFY1 MOV DX,SI ;Point DX to saved path SUB DX,3 MOV AH,3BH ;Restore path INT 21H CMP BYTE PTR [DI-2],"\" JE VERIFY_DONE MOV WORD PTR [DI-1],005CH ;Append \ to indicate path JMP SHORT VERIFY_DONE ;----------------------------------------------------------------------------- ;Try failed, search for file. ;----------------------------------------------------------------------------- VERIFY1: MOV CX,0 ;Normal search MOV AH,4EH ;Find first INT 21H JNC VERIFY_DONE ;file found, were done. CMP AX,3 ;check for bad path JNE VERIFY_DONE ;path found, must be file VERIFY_ERROR: MOV DX,OFFSET ERRMSG2 ;bad path, print path JMP DISP_ERROR ; not found. VERIFY_DONE: ;----------------------------------------------------------------------------- ;Check to see if the filenames are the same. ;----------------------------------------------------------------------------- MOV SI,OFFSET END_OF_CODE MOV DI,DX MOV CX,DX ;Compute length of name SUB CX,SI REPE CMPSB ;compare strings JE SAME_NAMES MOV AX,005CH CMP [DI-2],AX ;See if dest is path JNE COMPARE_NAMES1 MOV DI,SI ;Scan source for \. If not REPNE SCASB ; found, src and dest are JE COMPARE_NAMES1 ; in the same directory. SAME_NAMES: MOV DX,OFFSET ERRMSG4 ;Same, print error message JMP SHORT DISP_ERROR COMPARE_NAMES1: CMP ALRDY_INSTALLED,0 ;see if bcopy installed JE INSTALL ;----------------------------------------------------------------------------- ;Add new file names to installed code's queue and terminate. ;----------------------------------------------------------------------------- LOAD_FILES: MOV SI,OFFSET END_OF_CODE ;point to file names PUSH DS MOV DS,OTHER_SEG ;point ES to installed code ASSUME DS:NOTHING LOAD_QUEUE0: CMP DS:[ACTIVE],1 ;Wait till background not JNE LOAD_QUEUE0 ; active. CMP DS:EMS_FLAG,1 ;See if we need to map JNE LOAD_QUEUE1 ; Expanded memory. MOV DX,DS:EMS_HANDLE MOV AX,4400H ;Map to physical page 0 XOR BX,BX ;Map logical page 0 INT 67H OR AH,AH ;Check for error JE LOAD_QUEUE1 JMP EMS_ERROR LOAD_QUEUE1: MOV DI,DS:[QUEUE_HEAD_PTR] ;Get start of queue. MOV ES,DS:[DATA_SEGMENT] LOAD_QUEUE2: MOV AX,0FFFFH CMP ES:[DI],AX ;Is queue empty? JE LOAD_QUEUE3 ;yes, continue MOV DI,ES:[DI] ;Get pointer to next file JMP LOAD_QUEUE2 LOAD_QUEUE3: POP DS ;restore DS ASSUME DS:CODE CALL PUTINQUEUE ;copy filenames into queue MOV ES,OTHER_SEG MOV ES:[DATA_BUFF_START],DI INC ES:FILE_COUNT ;----------------------------------------------------------------------------- ;Enable background task and terminate. ;----------------------------------------------------------------------------- TERMINATE: DEC ES:[ACTIVE] ;enable background task. MOV AX,4C00H ;Terminate with RC = 0. INT 21H ;============================================================================= ;Display error message and exit with Return Code = 1. ;============================================================================= DISP_ERROR: CALL MESSAGE MOV ES,OTHER_SEG ;point ES to installed code DEC ES:[ACTIVE] ;enable background task. MOV AX,4C01H ;Exit RC = 1 INT 21H ;============================================================================= ;Install. Get address of INDOS flag. ;============================================================================= INSTALL: MOV AH,34H ;get address from DOS INT 21H MOV WORD PTR INDOS,BX ;store it MOV WORD PTR INDOS[2],ES ;----------------------------------------------------------------------------- ;Find and save the address of the DOS critical error flag. ;----------------------------------------------------------------------------- MOV AX,3E80H ;CMP opcode MOV CX,2000H ;max search length MOV DI,BX ;start at INDOS address CEFS1: REPNE SCASW ;do the search JCXZ CEFS2 ;branch if search failed CMP BYTE PTR ES:[DI+5],0BCH ;verify this is it JE CEFSFOUND ;branch if it is JMP CEFS1 ;resume loop if it's not CEFS2: MOV CX,2000H ;search again INC BX ;search odd addresses this time MOV DI,BX CEFS3: REPNE SCASW ;look for the opcode JCXZ CEFSNOTFOUND ;not found if loop expires CMP BYTE PTR ES:[DI+5],0BCH ;verify this is it JE CEFSFOUND JMP CEFS3 CEFSNOTFOUND: MOV DX,OFFSET ERRMSG3 ;Critical error flag not found JMP SHORT DISP_ERROR CEFSFOUND: MOV AX,ES:[DI] ;get flag offset address MOV WORD PTR CEF_PTR,AX ;store it MOV WORD PTR CEF_PTR[2],ES ;----------------------------------------------------------------------------- ;Set up EMS memory if necessary. ;----------------------------------------------------------------------------- PUSH CS POP DATA_SEGMENT ;assume no ems memory CMP EMS_FLAG,0 JE SKIP_EMS_SETUP ;Test for the EMS driver. PUSH ES ;Test for ems driver PUSH DI MOV AX,3567H ;Get EMS vector INT 21H MOV DI,0AH ;Using the segment from the MOV SI,OFFSET EMS_HEADER ; 67h vector, look at offset MOV CX,8 ; 0ah. Compare the next 8 CLD ; bytes with the expected REPE CMPSB ; EMS header. If they are POP DI ; the same, EMS driver POP ES ; found. JE EMS_FOUND EMS_ERROR: MOV DX,OFFSET ERRMSG7 ;EMS driver error JMP DISP_ERROR EMS_FOUND: STC MOV AH,40H ;Check status INT 67H OR AH,AH JNE EMS_ERROR MOV AH,41H ;Get page frame segment INT 67H OR AH,AH JNE EMS_ERROR MOV DATA_SEGMENT,BX ;Save seg of EMS page frame MOV AH,43H ;Get page frame segment MOV BX,1 ;request 1 page INT 67H OR AH,AH JNE EMS_ERROR MOV EMS_HANDLE,DX ;Save EMS handle MOV AX,4400H ;Map page XOR BX,BX ;map page 1 MOV DX,EMS_HANDLE ;identify user INT 67H OR AH,AH JNE EMS_ERROR MOV DATA_BUFF_END,4096 ;set buffer parameters MOV DATA_BUFF_START,0 SKIP_EMS_SETUP: ;----------------------------------------------------------------------------- ;Initialize pointers needed for queue. ;----------------------------------------------------------------------------- MOV BX,DATA_BUFF_START ;initialize queue MOV QUEUE_HEAD_PTR,BX ;----------------------------------------------------------------------------- ;Set interrupt 8h, 13h, and 28h vectors to internal handlers. ;----------------------------------------------------------------------------- MOV AX,3508H ;interrupt 8 INT 21H MOV WORD PTR INT8H,BX MOV WORD PTR INT8H[2],ES MOV AX,2508H MOV DX,OFFSET TIMERINT INT 21H MOV AX,3513H ;interrupt 13h INT 21H MOV WORD PTR INT13H,BX MOV WORD PTR INT13H[2],ES MOV AX,2513H MOV DX,OFFSET DISKINT INT 21H MOV AX,3528H ;interrupt 28h INT 21H MOV WORD PTR INT28H,BX MOV WORD PTR INT28H[2],ES MOV AX,2528H MOV DX,OFFSET IDLE INT 21H ;----------------------------------------------------------------------------- ;Deallocate the program's environment block. ;----------------------------------------------------------------------------- MOV AX,DS:[2CH] ;get environment segment MOV ES,AX MOV AH,49H ;free it INT 21H PUSH CS ;reset ES to the code segment POP ES JMP FINALINSTALL ;Jump to code above data area INITIALIZE ENDP ;====================================================================== ; Send message to screen ;---------------------------------------------------------------------- CRLF$ DB 13,10,"$" MESSAGE PROC NEAR ASSUME CS:CODE,DS:CODE MOV AH,9 INT 21H MOV DX,OFFSET CRLF$ MOV AH,9 INT 21H RET MESSAGE ENDP ;====================================================================== ; PARSE_FILENAME creates a proper pathname for a filename ; Entry: SI - pointer to asciiz filename ; DI - pointer to buffer to hold resulting pathname ;----------------------------------------------------------------------------- PARSE_FILENAME PROC NEAR ASSUME CS:CODE,DS:CODE,ES:CODE PARSE0: CALL SCANFORSEP ;Scan till character found LAHF ;Save return flags CMP AL,0DH ;See if carrage return or JE PARSE01 ; command switch. CMP AL,"/" JE PARSE01 SAHF JC PARSE0 JMP SHORT PARSE02 PARSE01: MOV WORD PTR [SI-1],0 ;If so, fake a null file name PARSE02: ;Look for disk specification DEC SI ;backup to before 1st char CMP BYTE PTR 1[SI],":" ;see if disk specified JE PARSE1 MOV AL,DEF_DISK ;Get default disk MOV DL,AL ;save default disk number ADD AL,40H ;Convert to ascii MOV AH,":" JMP SHORT PARSE2 PARSE1: LODSW ;Get disk specified AND AL,0DFH ;convert to caps MOV DL,AL SUB DL,40H ;convert to binary PARSE2: STOSW ;Load disk specification ;Look for directory specification. MOV BX,DI ;save start of path MOV AL,"\" CMP BYTE PTR [SI],AL ;See if starting from root JE PARSE3 ;yes, skip append of path STOSB ;Start at root PUSH SI ;save current pointer MOV SI,DI ;point to dest buffer MOV AH,47H ;Get default path INT 21H MOV CX,64 ;Max 64 char in path MOV AL,0 REPNE SCASB ;scan for end of path DEC DI ;move back before zero POP SI CMP CX,63 ;If no path, don't append an JGE PARSE3 ; extra \. PARSE21: CALL SCANFORSEP ;Get first char of name. JC PARSE5 ;If no name, skip append DEC SI ;Backup so char can be reread MOV AL,"\" ;If name, seperate from path STOSB ; with a \. PARSE3: ;Look for filename specification. MOV CX,75 ;max 75 characters in a name XOR AH,AH ;Clear last char holder PARSE4: CALL SCANFORSEP ;Get character, if seperator JC PARSE5 ; char, exit. STOSB ;Good char, copy to dest. CMP AX,".." ;See if last 2 chars are same JNE PARSE41 STD ;scan backwards SUB DI,4 ;First, backup past '\..' MOV AL,"\" ;Look for directory sep PUSH CX MOV CX,DI ;compute length of path SUB CX,BX REPNE SCASB ;Now, past last directory POP CX CLD ;scan forwards again INC DI ;Move back past \ PARSE41: MOV AH,AL ;save last character read. LOOP PARSE4 PARSE5: XOR AL,AL ;Terminate string with 0 STOSB RET PARSE_FILENAME ENDP ;----------------------------------------------------------------------------- ; SCANFORSEP looks for file seperator characters. ; Entry: DS:SI - pointer to character to compare ; Exit: CF clear - good character ; CF set - file seperator character detected ; AL - character read. ;----------------------------------------------------------------------------- SCANFORSEP PROC NEAR LODSB ;Get character CMP AL," " ;Look for file delimiters JLE SCANFOR1 ; space, comma, semicolon, CMP AL,"," ; equal sign, or tab. Or any JE SCANFOR1 ; characters with ASCII CMP AL,";" ; values less than 20 or JE SCANFOR1 ; greater than 127. CMP AL,"=" JE SCANFOR1 CMP AL,"a" ;Convert all letters to caps JB SCANFOR_END CMP AL,"z" JA SCANFOR_END AND AL,0DFH ;convert to caps SCANFOR_END: CLC ;clear flag RET SCANFOR1: STC ;set found flag RET SCANFORSEP ENDP END_OF_CODE = $ CODE ENDS END BEGIN