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Assembly Source File | 1984-03-04 | 16.0 KB | 440 lines

NAME VWTOWS PAGE 55,132 TITLE 'VWTOWS --- FILTER VW TEXT FILE FOR WORDSTAR' ; ; VWTOWS -- CONVERT VOLKSWRITER FILE TO WORDSTAR DOCUMENT FILE. ; EXTRA SEQUENTIAL SPACES ARE CONVERTED TO "SOFT SPACES". ; PARAGRAPH MARKERS ARE CONVERTED TO "HARD CARRIAGE RETURNS". ; NORMAL CR'S ARE CONVERTED TO "SOFT CARRIAGE RETURNS". ; ALL OTHER CONTROL CHARACTERS EXCEPT FOR LINE FEEDS AND FORM ; FEEDS ARE DISCARDED. ; VERSION 1.0 10 DEC 83 ; ; COPYRIGHT (C) 1983 BY RAY DUNCAN CR EQU 0DH ;ASCII CARRIAGE RETURN LF EQU 0AH ;ASCII LINE FEED FF EQU 0CH ;ASCII FORM FEED EOF EQU 01AH ;END OF FILE MARKER TAB EQU 09H ;ASCII TAB CHARACTER COMMAND EQU 80H ;BUFFER FOR COMMAND TAIL BLKSIZE EQU 1024 ;BLOCKING/DEBLOCKING SIZE CSEG SEGMENT PARA PUBLIC 'CODE' ASSUME CS:CSEG,DS:DATA,ES:DATA,SS:STACK CLEAN PROC FAR ;ENTRY POINT FROM PC-DOS PUSH DS ;SAVE DS:0000 FOR FINAL XOR AX,AX ;RETURN TO PC-DOS PUSH AX MOV AX,DATA ;MAKE OUR DATA SEGMENT MOV ES,AX ;ADDRESSABLE VIA ES REGISTER CALL INFILE ;GET PATH AND FILE SPEC. ;FOR INPUT FILE MOV AX,ES ;SET DS=ES FOR REMAINDER MOV DS,AX ;OF PROGRAM JNC CLEAN1 ;JUMP, GOT ACCEPTABLE NAME MOV DX,OFFSET MSG4 ;MISSING OR ILLEGAL FILESPEC, JMP CLEAN9 ;PRINT ERROR MESSAGE AND EXIT. CLEAN1: CALL OUTFILE ;SET UP OUTPUT FILE NAME CALL OPEN_INPUT ;NOW TRY TO OPEN INPUT FILE JNC CLEAN2 ;JUMP,OPENED INPUT OK MOV DX,OFFSET MSG1 ;OPEN OF INPUT FILE FAILED, JMP CLEAN9 ;PRINT ERROR MSG AND EXIT. CLEAN2: CALL OPEN_OUTPUT ;TRY TO OPEN OUTPUT FILE. JNC CLEAN25 ;JUMP,OPENED OK MOV DX,OFFSET MSG2 ;OPEN OF OUTPUT FILE FAILED, JMP CLEAN9 ;PRINT ERROR MESSAGE AND EXIT. CLEAN25: ;ALL FILES OPENED SUCCESSFULLY, CALL SIGN_ON ;PRINT SIGN-ON MESSAGE AND CALL INIT_BUFFS ;SET UP BUFFERS. CLEAN3: ;NOW FILTER THE FILE. CALL GET_CHAR ;READ 1 CHARACTER FROM INPUT. AND AL,07FH ;STRIP OFF THE HIGH BIT CMP AL,20H ;IS IT A CONTROL CODE OR SPACE? JA CLEAN4 ;NO,WRITE IT TO NEW FILE JNE CLEAN32 ;JUMP IF NOT A SPACE CODE MOV AH,PREV_CHAR ;CHECK IF LAST CHAR WAS A SPACE AND AH,7FH CMP AH,20H JNE CLEAN4 ;NO,WRITE NORMAL SPACE OR AL,80H ;YES, CONVERT THIS SPACE TO "SOFT" JMP CLEAN4 ;AND WRITE IT TO THE FILE CLEAN32: ;IT IS CONTROL CODE, CMP AL,EOF ;IS IT END OF FILE MARKER? JE CLEAN6 ;YES,JUMP TO CLOSE FILES. CMP AL,14H ;IS IT VW PARAGRAPH MARKER? JNE CLEAN33 ;NO,JUMP CALL GET_CHAR ;DISCARD FOLLOWING CR-LF CALL GET_CHAR MOV AL,CR ;CONVERT IT TO "HARD" RETURN CALL PUT_CHAR ;AND LINE FEED SEQUENCE. MOV AL,LF JMP CLEAN35 ;AND WRITE IT TO FILE. CLEAN33: CMP AL,TAB ;IS IT A TAB COMMAND? JZ CLEAN5 ;YES,JUMP TO SPECIAL PROCESSING. CMP AL,CR ;IF CARRIAGE RETURN AND THE LINE IS JNE CLEAN34 ;NOT EMPTY, CONVERT IT TO "SOFT RETURN" MOV BX,COLUMN OR BX,BX JZ CLEAN35 OR AL,80H ;AND WRITE IT TO FILE JMP CLEAN35 CLEAN34: CMP AL,LF ;IF LINE FEED WRITE IT TO FILE, JNE CLEAN3 ;OTHERWISE DISCARD CONTROL CODE. CLEAN35: ;IF IT IS ONE OF THOSE THREE, MOV COLUMN,0 ;INCIDENTALLY INITIALIZE JMP CLEAN45 ;COLUMN COUNT FOR TAB PROCESSOR. CLEAN4: ;COUNT ALPHANUMERIC CHARS. SENT. INC COLUMN CLEAN45: ;WRITE THIS CHARACTER TO CALL PUT_CHAR ;OUTPUT FILE, JNC CLEAN3 ;IF CY NOT SET, WRITE WAS ;OK SO GO GET NEXT CHAR. CLEAN47: CALL CLOSE_INPUT ;IF CY SET, DISK IS FULL CALL CLOSE_OUTPUT ;SO CLOSE FILES AND EXIT MOV DX,OFFSET MSG5 ;WITH ERROR MESSAGE. JMP CLEAN9 CLEAN5: ;PROCESS TAB CHARACTER MOV AX,COLUMN ;LET DX:AX=COLUMN COUNT CWD MOV CX,8 ;DIVIDE IT BY EIGHT... IDIV CX SUB CX,DX ;REMAINDER IS IN DX. ADD COLUMN,CX ;UPDATE COLUMN POINTER. CLEAN55: ;8 MINUS THE REMAINDER PUSH CX ;GIVES US THE NUMBER OF MOV AL,20H ;SPACES TO SEND OUT TO CALL PUT_CHAR ;MOVE TO THE NEXT TAB POSITION POP CX ;RESTORE SPACE COUNT JC CLEAN47 ;JUMP IF DISK IS FULL LOOP CLEAN55 JMP CLEAN3 ;GET NEXT CHARACTER CLEAN6: ;END OF FILE DETECTED, CALL PUT_CHAR ;WRITE END-OF-FILE MARKER, JC CLEAN47 ;JUMP IF DISK WAS FULL CALL FLUSH_BUFFS ;WRITE REMAINING DATA TO DISK JC CLEAN47 ;IF CY SET,DISK WAS FULL ;OTHERWISE FILE WAS WRITTEN OK CALL CLOSE_INPUT ;CLOSE INPUT AND OUTPUT CALL CLOSE_OUTPUT ;FILES. MOV DX,OFFSET MSG3 ;ADDR OF SUCCESS MESSAGE, CLEAN9: ;PRINT MESSAGE AND RETURN MOV AH,9 ;CONTROL TO PC-DOS INT 21H RET CLEAN ENDP INFILE PROC NEAR ;PROCESS NAME OF INPUT FILE ;DS:SI <- ADDR COMMAND LINE MOV SI,OFFSET COMMAND ;ES:DI <- ADDR FILESPEC BUFFER MOV DI,OFFSET INPUT_NAME CLD LODSB ;ANY COMMAND LINE PRESENT? OR AL,AL ;RETURN ERROR STATUS IF NOT. JZ INFILE4 INFILE1: ;SCAN OVER LEADING BLANKS LODSB ;TO FILE NAME CMP AL,CR ;IF WE HIT CARRIAGE RETURN JZ INFILE4 ;FILENAME IS MISSING. CMP AL,20H ;IS THIS A BLANK? JZ INFILE1 ;IF SO KEEP SCANNING. INFILE2: ;FOUND FIRST CHAR OF NAME, STOSB ;MOVE LAST CHAR. TO OUTPUT ;FILE NAME BUFFER. LODSB ;CHECK NEXT CHARACTER, FOUND CMP AL,CR ;CARRIAGE RETURN YET? JE INFILE3 ;YES,EXIT WITH SUCCESS CODE CMP AL,20H ;IS THIS A BLANK? JNE INFILE2 ;IF NOT KEEP MOVING CHARS. INFILE3: ;EXIT WITH CARRY =0 CLC ;FOR SUCCESS FLAG RET INFILE4: ;EXIT WITH CARRY =1 STC ;FOR ERROR FLAG RET INFILE ENDP OUTFILE PROC NEAR ;SET UP PATH AND FILE CLD ;NAME FOR OUTPUT FILE. MOV CX,64 ;LENGTH TO MOVE MOV SI,OFFSET INPUT_NAME ;SOURCE ADDR MOV DI,OFFSET OUTPUT_NAME ;DEST ADDR REP MOVSB ;TRANSFER THE STRING MOV DI,OFFSET OUTPUT_NAME OUTFILE1: ;SCAN STRING LOOKING FOR MOV AL,[DI] ;"." MARKING START OF EXTENSION OR AL,AL ;OR ZERO BYTE MARKING NAME END. JZ OUTFILE2 ;IF EITHER IS FOUND,JUMP. CMP AL,'.' JE OUTFILE2 ;BUMP STRING POINTER, LOOP INC DI ;IF NEITHER '.' OR ZERO FOUND. JMP OUTFILE1 OUTFILE2: ;FOUND ZERO OR '.',FORCE THE ;EXTENSION OF OUTPUT FILE TO '.WS' MOV SI,OFFSET OUTFILE_EXT MOV CX,4 REP MOVSB RET ;BACK TO CALLER OUTFILE ENDP OPEN_INPUT PROC NEAR ;OPEN INPUT FILE ;DS:DX=ADDR FILENAME MOV DX,OFFSET INPUT_NAME MOV AL,0 ;AL=0 FOR READ ONLY MOV AH,3DH ;FUNCTION 3DH=OPEN INT 21H ;HANDLE RETURNED IN AX, MOV INPUT_HANDLE,AX ;SAVE IT FOR LATER. RET ;CY IS SET IF ERROR OPEN_INPUT ENDP OPEN_OUTPUT PROC NEAR ;OPEN OUTPUT FILE ;DS:DX=ADDR FILENAME MOV DX,OFFSET OUTPUT_NAME MOV AL,1 ;AL=1 FOR WRITE ONLY MOV AH,3CH ;FUNCTION 3CH=MAKE OR INT 21H ;TRUNCATE EXISTING FILE ;HANDLE RETURNED IN AX MOV OUTPUT_HANDLE,AX;SAVE IT FOR LATER. RET ;RETURN CY=TRUE IF ERROR OPEN_OUTPUT ENDP CLOSE_INPUT PROC NEAR ;CLOSE INPUT FILE MOV BX,INPUT_HANDLE ;BX=HANDLE MOV AH,3EH INT 21H RET CLOSE_INPUT ENDP CLOSE_OUTPUT PROC NEAR ;CLOSE OUTPUT FILE MOV BX,OUTPUT_HANDLE;BX=HANDLE MOV AH,3EH INT 21H RET CLOSE_OUTPUT ENDP GET_CHAR PROC NEAR ;GET ONE CHARACTER FROM INPUT BUFFER MOV BX,INPUT_PTR CMP BX,BLKSIZE JNE GET_CHAR1 CALL READ_BLOCK MOV BX,0 GET_CHAR1: MOV AL,[INPUT_BUFFER+BX] INC BX MOV INPUT_PTR,BX RET GET_CHAR ENDP PUT_CHAR PROC NEAR ;PUT ONE CHARACTER INTO OUTPUT BUFFER MOV PREV_CHAR,AL ;SAVE COPY OF MOST RECENT OUTPUT MOV BX,OUTPUT_PTR MOV [OUTPUT_BUFFER+BX],AL INC BX MOV OUTPUT_PTR,BX CMP BX,BLKSIZE ;BUFFER FULL YET? JNE PUT_CHAR1 ;NO,JUMP CALL WRITE_BLOCK ;YES,WRITE THE BLOCK RET ;RETURN CY AS STATUS CODE PUT_CHAR1: CLC ;RETURN CY CLEAR FOR OK STATUS RET PUT_CHAR ENDP READ_BLOCK PROC NEAR MOV BX,INPUT_HANDLE ;READ FIRST BLOCK OF INPUT MOV CX,BLKSIZE MOV DX,OFFSET INPUT_BUFFER MOV AH,3FH INT 21H JNC READ_BLOCK1 ;JUMP IF NO ERROR STATUS MOV AX,0 ;SIMULATE A ZERO LENGTH READ IF ERROR READ_BLOCK1: CMP AX,BLKSIZE ;WAS FULL BUFFER READ IN? JE READ_BLOCK2 ;YES,JUMP MOV BX,AX ;NO, STORE END-OF-FILE MARK MOV BYTE PTR [INPUT_BUFFER+BX],EOF READ_BLOCK2: XOR AX,AX ;INITIALIZE INPUT BUFFER POINTER MOV INPUT_PTR,AX RET READ_BLOCK ENDP WRITE_BLOCK PROC NEAR ;WRITE BLOCKED OUTPUT (BLKSIZE BYTES) MOV DX,OFFSET OUTPUT_BUFFER MOV CX,BLKSIZE MOV BX,OUTPUT_HANDLE MOV AH,40H INT 21H XOR BX,BX ;INITIALIZE POINTER TO BLOCKING BUFFER MOV OUTPUT_PTR,BX CMP AX,BLKSIZE ;WAS CORRECT LENGTH WRITTEN? JNE WRITE_BLOCK1 ;NO,DISK MUST BE FULL CLC ;YES,RETURN CY=0 INDICATING ALL OK RET WRITE_BLOCK1: ;DISK IS FULL, RETURN CY =1 STC ;AS ERROR CODE RET WRITE_BLOCK ENDP INIT_BUFFS PROC NEAR CALL READ_BLOCK ;READ 1ST BLOCK OF INPUT XOR AX,AX ;INITIALIZE POINTER TO OUTPUT MOV OUTPUT_PTR,AX ;OUTPUT BLOCKING BUFFER RET INIT_BUFFS ENDP FLUSH_BUFFS PROC NEAR ;WRITE ANY DATA IN OUTPUT BUFFER TO DISK MOV CX,OUTPUT_PTR OR CX,CX JZ FLUSH_BUFFS1 ;JUMP,BUFFER IS EMPTY MOV BX,OUTPUT_HANDLE MOV DX,OFFSET OUTPUT_BUFFER MOV AH,40H INT 21H CMP AX,OUTPUT_PTR ;WAS WRITE SUCCESSFUL? JNZ FLUSH_BUFFS2 ;NO,JUMP FLUSH_BUFFS1: ;SUCCESSFUL DISK WRITE, CLC ;RETURN CY=0 FOR RET ;SUCCESS FLAG FLUSH_BUFFS2: ;DISK WAS FULL SO WRITE FAILED, STC ;RETURN CY=1 AS ERROR FLAG RET FLUSH_BUFFS ENDP SIGN_ON PROC NEAR ;PRINT SIGN-ON MESSAGE MOV DX,OFFSET MSG6 ;TITLE... MOV AH,9 INT 21H MOV DX,OFFSET MSG7 ;INPUT FILE: MOV AH,9 INT 21H MOV DX,OFFSET INPUT_NAME CALL PASCIIZ MOV DX,OFFSET MSG8 ;OUTPUT FILE: MOV AH,9 INT 21H MOV DX,OFFSET OUTPUT_NAME CALL PASCIIZ MOV DX,OFFSET MSG9 MOV AH,9 INT 21H RET SIGN_ON ENDP PASCIIZ PROC NEAR ;CALL DX=OFFSET OF ASCIIZ STRING MOV BX,DX ;WHICH WILL BE PRINTED ON STANDARD OUTPUT PASCIIZ1: MOV DL,[BX] OR DL,DL JZ PASCIIZ9 CMP DL,'A' JB PASCIIZ2 CMP DL,'Z' JA PASCIIZ2 OR DL,20H PASCIIZ2: MOV AH,2 INT 21H INC BX JMP PASCIIZ1 PASCIIZ9: RET PASCIIZ ENDP CSEG ENDS DATA SEGMENT PARA PUBLIC 'DATA' INPUT_NAME DB 64 DUP (0) ;BUFFER FOR INPUT FILESPEC OUTPUT_NAME DB 64 DUP (0) ;BUFFER FOR OUTPUT FILESPEC INPUT_HANDLE DW 0 ;TOKEN RETURNED BY PCDOS OUTPUT_HANDLE DW 0 ;TOKEN RETURNED BY PCDOS INPUT_PTR DW 0 ;POINTER TO INPUT BLOCKING BUFFER OUTPUT_PTR DW 0 ;POINTER TO OUTPUT BLOCKING BUFFER OUTFILE_EXT DB '.WS',0 ;EXTENSION FOR FILTERED FILE COLUMN DW 0 ;COLUMN COUNT FOR TAB PROCESSING PREV_CHAR DB 0 ;LAST CHARACTER WRITTEN TO OUTPUT MSG1 DB CR,LF DB 'CANNOT FIND INPUT FILE.' DB CR,LF,'$' MSG2 DB CR,LF DB 'FAILED TO OPEN OUTPUT FILE.' DB CR,LF,'$' MSG3 DB CR,LF DB 'FILE PROCESSING COMPLETED' DB CR,LF,'$' MSG4 DB CR,LF DB 'MISSING FILE NAME.' DB CR,LF,'$' MSG5 DB CR,LF DB 'DISK IS FULL.' DB CR,LF,'$' MSG6 DB CR,LF DB 'CONVERT VOLKSWRITER FILE TO WORDSTAR DOCUMENT' DB CR,LF DB 'COPYRIGHT (C) 1983 LABORATORY MICROSYSTEMS INC.' DB CR,LF,'$' MSG7 DB CR,LF,'INPUT FILE: $' MSG8 DB CR,LF,'OUTPUT FILE: $' MSG9 DB CR,LF,'$' INPUT_BUFFER DB BLKSIZE DUP (?) ;BUFFER FOR DEBLOCKING OF DATA ;FROM INPUT FILE OUTPUT_BUFFER DB BLKSIZE DUP (?) ;BUFFER FOR BLOCKING OF DATA ;SENT TO OUTPUT FILE DATA ENDS STACK SEGMENT PARA STACK 'STACK' DB 64 DUP (?) STACK ENDS END CLEAN