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Assembly Source File | 1987-03-23 | 45.3 KB | 1,390 lines

;====================================================================== ; MAKEBAR: read a bar-definition-file (.BDF) and produce a tokenized ; .BAR file to be read by the TSR interpreter. ;---------------------------------------------------------------------- CSEG SEGMENT PUBLIC PARA 'CODE' ASSUME CS:CSEG, DS:CSEG, ES:CSEG, SS:CSEG ORG 100H ENTPT: JMP MAIN COPYRIGHT DB "MAKEBAR 1.0 (c) 1987, Ziff-Davis Publishing Corp",CR,LF,'$' AUTHOR DB 1AH,"Robert L. Hummel" ;====================================================================== ; EQUATES ;---------------------------------------------------------------------- SPACE EQU 20H ;Some keys CR EQU 0DH LF EQU 0AH QUOTE EQU 22H TAB EQU 09H INPUT_BUF_LEN EQU 4000 ;Size constants OUTPUT_BUF_LEN EQU 46000 MENU_BUF_LEN EQU 4000 MENU_TBL_LEN EQU 4000 BUF_TOTAL = INPUT_BUF_LEN + OUTPUT_BUF_LEN + MENU_BUF_LEN + MENU_TBL_LEN _SHIFT EQU 1 ;Internal shift flags _CTRL EQU 2 _ALT EQU 4 ;---------------------------------------------------------------------- ; BUFFERS AND POINTERS ;---------------------------------------------------------------------- INPUT_HNDL DW 0 ;Handle of source file INPUT_HNDL_PTR DW 0 ;Pointer to source file INPUT_BUF_END DW 0FFFFH ;Used by GET_CHAR OUTPUT_HNDL DW 0 ;Handle of output file MENU_HEAD DW 0 ;Pointer to current menu SHIFT_FLAGS DB 0 ;Hold current shift state ;---------------------------------------------------------------------- ; COUNTERS ;---------------------------------------------------------------------- SOURCE_LINE DW 0 ;For error messages NEW_REF DB -1 ;Two counters track menu OLD_REF DB 0 ; references ;---------------------------------------------------------------------- ; TABLES ;---------------------------------------------------------------------- CMD_TABLE LABEL BYTE ;All commands names _ASK EQU 0 ; and their token values A_CMD DB 'ASK',0 _CR EQU 1 C_CMD DB 'CR',0 _EXECUTE EQU 2 E_CMD DB 'EXECUTE',0 _INPUT EQU 3 I_CMD DB 'INPUT',0 _MENU EQU 4 M_CMD DB 'MENU',0 _OPTION EQU 5 O_CMD DB 'OPTION',0 _PROGRAM EQU 6 P_CMD DB 'PROGRAM',0 _TYPE EQU 7 _CMD DB 'TYPE',0 _MEND EQU 8 DB 'MEND',0 _END EQU 9 DB 'END',0 _SEND EQU 10 DB 0 ;End-of-table byte ;---------------------------------------------------------------------- KEY_NAME_TBL LABEL BYTE ;Special key names DB "S",0,"C",0,"A",0 DB "F1",0,"F2",0,"F3",0,"F4",0,"F5",0 DB "F6",0,"F7",0,"F8",0,"F9",0,"F10",0 DB "ESC",0,"TAB",0,"ENTER",0,"BS",0 DB "HOME",0,"PGUP",0,"END",0,"PGDN",0,"INS",0 DB "DEL",0,"U",0,"D",0,"L",0,"R",0,0 ;---------------------------------------------------------------------- ; These keys may be combined with the CRTL and ALT keys ;---------------------------------------------------------------------- KEY_TBL_1 DB "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890-=\[]",0 ;---------------------------------------------------------------------- ; CTRL combinations for 1234567890-= (use {c}1 for ; {c}3 for ") ;---------------------------------------------------------------------- KEY_TBL_2 DW 003BH,0FE03H,0022H,0,0,001EH,0,0,0,0,001FH,0 DW 001CH, 001BH, 001DH ;---------------------------------------------------------------------- ; Scan codes for alpha keys a-z (used for ALT-alpha) ;---------------------------------------------------------------------- KEY_TBL_3 DB 01EH,30H,2EH,20H,12H,21H,22H,23H,17H,24H,25H,26H DB 32H,31H,18H,19H,10H,13H,1FH,14H,16H,2FH,11H,2DH DB 15H,2CH ;---------------------------------------------------------------------- ; SHIFT,CTRL for enter,bs,home,pgup,end,pgdn,ins,del,up,down,left,right ;---------------------------------------------------------------------- KEY_TBL_4 DB 0DH,0FEH, 8,7FH, 47H,77H, 49H,84H, 4FH,75H DB 51H,76H, 52H,0, 53H,0, 48H,0, 50H,0, 4BH,73H,4DH,74H ;---------------------------------------------------------------------- ; FLAGS ;---------------------------------------------------------------------- MENU_FLAG DB 0 ;Non-zero when open menu blk OPTION_FLAG DB 0 ;Non-zero when open option blk PROGRAM_NAME_FLAG DB 0 ;Non-zero when PROGRAM cmd read ;---------------------------------------------------------------------- ; MESSAGES ;---------------------------------------------------------------------- USAGE_MSG DB "Usage: MAKEBAR [path]input_file [path]output_file$" BAD_FILE_MSG DB "Can't Open File$" READ_MSG DB "Error Reading File$" DUP_CMD_MSG DB "Duplicate Cmd$" CMD_ORDER_MSG DB "Cmd Out Of Order$" UNK_CMD_MSG DB "Unknown Cmd$" NEST_MSG DB "MENU Without MEND$" SYNTAX_MSG DB "Syntax Error$" NO_NAME_MSG DB "Missing Name$" REF_MSG DB "Bad MENU Reference$" EOF_MSG DB "Missing END$" DEAD_KEY_MSG DB "Dead-Key or Bad Key$" LINE_MSG DB CR,LF,"Error At Line # $" LINE_NUM_BUF EQU $-2 ;====================================================================== ; MENU FILE TOKENIZER - MAIN PROCEDURE ;---------------------------------------------------------------------- MAIN PROC NEAR MOV AH,9 ;Display string fn MOV DX,OFFSET COPYRIGHT ;Say who we are INT 21H ; Thru DOS CLD ;Strings moves forward ;---------------------------------------------------------------------- ; Check the file specs given on the command line. Open the files and ; save the file handles. ;---------------------------------------------------------------------- CALL OPEN_FILES ;---------------------------------------------------------------------- ; Read in the Menu-Definition-File and tokenize. Write the output to ; the new .BAR file for use with the resident interpreter. ;---------------------------------------------------------------------- CALL TOKENIZE ;---------------------------------------------------------------------- ; Close and update any open files. Terminate gracefully. ;---------------------------------------------------------------------- CALL CLOSE_FILES MOV AX,4C00H ;Terminate process INT 21H ; Thru DOS MAIN ENDP ;====================================================================== ; OPEN_FILES - Open the file given on the command line and the working ; files needed during operation of the tokenizer. ;---------------------------------------------------------------------- OPEN_FILES PROC NEAR MOV SI,81H ;Command line parameters CALL OPEN_A_FILE ;Open source MOV INPUT_HNDL,AX ;Save handle CALL OPEN_A_FILE ;Open destination file MOV OUTPUT_HNDL,AX ;Save handle MOV INPUT_BUF_END,0 ;Make refresh occur RET OPEN_FILES ENDP ;====================================================================== ; OPEN_A_FILE - Read a string from the command line and attempt to open ; it as a file. ;---------------------------------------------------------------------- OPEN_CNT DB 0 ;Switch for open function OPEN_A_FILE PROC NEAR CALL NON_WHITE ;Point SI to 1st nonwhite CMP AL,CR ;If not carriage return JNE HAVE_ARGS ; go parse arguments NO_SPECS: MOV DX,OFFSET USAGE_MSG ;Say how we are used OPEN_ERR: JMP ERROR_EXIT ;Exit thru error procedure HAVE_ARGS: PUSH SI ;Save start of string CALL WHITE ;Point past end MOV CX,SI ;End of string POP SI ;Restore start SUB CX,SI ;Get length of string OR CX,CX ;If zero JZ NO_SPECS ; no file names MOV DI,OFFSET PATH_BUF ;Copy string here REP MOVSB ; do it XOR AL,AL ;Make ASCIIZ STOSB ; put in buffer ;---------------------------------------------------------------------- ; Attempt to open the file. ;---------------------------------------------------------------------- MOV AX,3D00H ;Open file for reading CMP OPEN_CNT,0 ; if first file JE FILE_OPEN DEC AH ;Create file if second FILE_OPEN: MOV DX,OFFSET PATH_BUF ;Pathname of file INT 21H ;Handle in AX JNC SOURCE_OPEN ;No carry if open OK MOV DX,OFFSET BAD_FILE_MSG JMP OPEN_ERR SOURCE_OPEN: INC OPEN_CNT ;Change switch RET OPEN_A_FILE ENDP ;====================================================================== ; Close the files to update the length. ;---------------------------------------------------------------------- CLOSE_FILES PROC NEAR MOV AH,3EH ;Close file function MOV BX,INPUT_HNDL ; first file INT 21H ; Thru DOS MOV AH,3EH ;Close file function MOV BX,OUTPUT_HNDL ; second file INT 21H ; Thru DOS RET CLOSE_FILES ENDP ;====================================================================== ; TOKENIZE - Read and process the Bar Definition File (BDF). ;---------------------------------------------------------------------- TOKENIZE PROC NEAR ;---------------------------------------------------------------------- ; Clear flags and reset source line counter. ;---------------------------------------------------------------------- XOR AX,AX ;Zero MOV PROGRAM_NAME_FLAG,AL ;No program name MOV MENU_FLAG,AL ;Not inside MENU block MOV SOURCE_LINE,AX ;Source line counter MOV DI,OFFSET MENU_NAME_TBL ;Fill the table with zeros MOV CX,MENU_TBL_LEN ;Entire length REP STOSB ; do it CALL REFRESH_BUFFER ;Load some chars into buf MOV DI,OFFSET OUTPUT_BUF ;Init output buffer pointer ;---------------------------------------------------------------------- ; Parse the input file to find commands and arguments. ;---------------------------------------------------------------------- FIND_WORD: CALL NON_WHITE ;Find non-white char CMP AL,CR ;Ignore blank lines JNE TKN_1 CALL NEXT_LINE ;Skip to next line JMP FIND_WORD ;Continue search TKN_1: ;---------------------------------------------------------------------- ; SI points to word. Compare with known commands. Return token in AL ; or 0FFh if not recognized. ;---------------------------------------------------------------------- CALL MAKEZ ;Copy word at SI to buffer ; and make ASCIIZ PUSH SI ;Preserve SI MOV SI,OFFSET CMD_TABLE ;Look up word in this table CALL TABLE_LOOKUP ;Compare cmd in buffer POP SI ;AL = CMD # or FFh CMP AL,0FFH ;Is error? JNE TKN_1A ;No, valid CMD found MOV DX,OFFSET UNK_CMD_MSG JMP SHORT TKN_ERR TKN_1A: ;---------------------------------------------------------------------- ; If this is a PROGRAM statement, load the name of the program into the ; buffer. Must be the first command in the file. ;---------------------------------------------------------------------- CMP PROGRAM_NAME_FLAG,0 ;Test if already had PROGRAM PUSHF ;Save result CMP AL,_PROGRAM ;Is this PROGRAM? JE TKN_2 ; yes, jump POPF ;Did we have one? JNZ TKN_4 ; yes, try next cmd JMP TKN_7A ; no, error TKN_2: POPF ; yes, Did we have one? JZ TKN_3 ; No, this is first MOV DX,OFFSET DUP_CMD_MSG ; Yes, indicate error JMP SHORT TKN_ERR TKN_3: ;---------------------------------------------------------------------- ; Copy the name of the program to the output buffer. ;---------------------------------------------------------------------- MOV BX,DI ;Point BX to start of buf MOV AL,SPACE ;Fill name with spaces MOV CX,10 ;10 chars REP STOSB ;do it CALL NEXT_WORD CALL TKN_STRING ;Copy quoted string INC PROGRAM_NAME_FLAG ;Make flag non-zero JMP FIND_WORD ;Get next command TKN_4: ;---------------------------------------------------------------------- ; END command terminates processing. ;---------------------------------------------------------------------- CMP AL,_END ;If not END, jump JNE TKN_4A MOV AL,MENU_FLAG ;If no open menus OR AL,OPTION_FLAG ; or options JZ NO_OPENS ; then clean up TKN_4AA: MOV DX,OFFSET NEST_MSG ;Else, nesting error JMP SHORT TKN_ERR NO_OPENS: MOV AL,NEW_REF ;If no unbalanced menu OR AL,OLD_REF ; references JZ REFS_OK ; write the results MOV DX,OFFSET REF_MSG ;Else, error TKN_ERR: JMP ERROR_EXIT REFS_OK: ;---------------------------------------------------------------------- ; Flush the output buffer. ;---------------------------------------------------------------------- MOV DX,OFFSET OUTPUT_BUF ;Source buffer MOV CX,DI ;End of buf SUB CX,DX ; minus start = length MOV AH,40H ;Write to file MOV BX,OUTPUT_HNDL ; this handle INT 21H ;Thru DOS RET ;Return to top level ;---------------------------------------------------------------------- ; Is this a command to start a MENU block? ;---------------------------------------------------------------------- TKN_4A: CMP AL,_MENU JNE TKN_6 ;Jump if not MENU ;---------------------------------------------------------------------- ; If we are already inside an active menu block, either an MEND is ; missing or the menus are nested (both are errors). ;---------------------------------------------------------------------- CMP MENU_FLAG,0 JNE TKN_4AA ;Jump if in block ;---------------------------------------------------------------------- ; Execute MENU block startup code. Point BX to a buffer where the ; tokenized output will be temporarily stored. When then menu block is ; closed, the addresses in the menu header will be adjusted by the length ; of the header. ;---------------------------------------------------------------------- TKN_5: MOV BX,OFFSET MENU_BUF ;Buffer for menu tokens MOV MENU_HEAD,DI ;Location of menu header XOR AX,AX ;Number of OPTIONS = 0 STOSW ; placed in header (at DI) INC MENU_FLAG ;Say we're inside menu ;---------------------------------------------------------------------- ; Make sure the MENU command is followed by a name ;---------------------------------------------------------------------- CALL NEXT_WORD ;Point SI to next word CMP AL,CR ;If CR, no name = error JE TKN_8A ;---------------------------------------------------------------------- ; If Menu name is in table, it was referenced by an earlier menu and ; the address must be put back into that command line. If it's not in ; the table, add it and point to it's address. ;---------------------------------------------------------------------- CALL MAKEZ ;Change menu name to ASCIIZ MOV AX,MENU_HEAD ;Signal says posting SUB AX,OFFSET OUTPUT_BUF ;Make into offset CALL SEARCH_MENU_TABLE ;Enter in table or resolve ; reference or error CALL NEXT_LINE ;Skip to next line JMP FIND_WORD ;Continue parsing ;---------------------------------------------------------------------- ; If not a MENU command, must be inside a block to be valid. ;---------------------------------------------------------------------- TKN_6: CMP MENU_FLAG,0 JE TKN_7A ;Jump if outside block TKN_7: ;---------------------------------------------------------------------- ; Inside a MENU block must reside a series of OPTION blocks. ;---------------------------------------------------------------------- CMP OPTION_FLAG,0 ;Test if in option block PUSHF ; save result CMP AL,_OPTION JE TKN_8 ;Jump if OPTION POPF ;Inside option block? JNE TKN_12 ;Jump if yes TKN_7A: MOV DX,OFFSET CMD_ORDER_MSG JMP TKN_ERR TKN_8: POPF ;Inside option block? JE NEW_OPTION_BLOCK ;Jump if not ;---------------------------------------------------------------------- ; Close this option block by adding the SEND command. ;---------------------------------------------------------------------- MOV AL,_SEND ;Send token CALL PUT_MENUBUF ; to buffer ;---------------------------------------------------------------------- ; To start new option block, increase the option counter. ; Parse name and help line and point the pointers at them. ;---------------------------------------------------------------------- NEW_OPTION_BLOCK: INC OPTION_FLAG ;Inside option block MOV BP,MENU_HEAD ;Number options this MENU INC WORD PTR [BP] ; increase by 1 ;---------------------------------------------------------------------- ; Save the option name ;---------------------------------------------------------------------- CALL NEXT_WORD ;Point to OPTION NAME CMP AL,CR ;Option must have name JNE TKN_9 ;Jump if name TKN_8A: MOV DX,OFFSET NO_NAME_MSG JMP TKN_ERR TKN_9: CALL MAKEZ ;Make name at SI into ASCIIZ MOV AX,BX ;Address where name is stored SUB AX,OFFSET MENU_BUF ; from start of buffer STOSW ; is saved in menu header ;---------------------------------------------------------------------- ; Copy the option name from the asciiz buffer to the menu buffer ;---------------------------------------------------------------------- PUSH SI ;Save register MOV SI,OFFSET PATH_BUF ;Source for copy COPY_NAME: LODSB ;Get char CALL PUT_MENUBUF OR AL,AL ;If not last byte JNZ COPY_NAME ;continue copy POP SI ;Restore register CALL NEXT_WORD ;Look for help line ;---------------------------------------------------------------------- ; HELP line is quoted string ;---------------------------------------------------------------------- TKN_11: MOV AX,BX ;Offset from start of buf SUB AX,OFFSET MENU_BUF ; is location to put STOSW ; in header CALL TKN_STRING ;---------------------------------------------------------------------- ; Put the offset where the tokenized commands will start into the header. ;---------------------------------------------------------------------- MOV AX,BX ;Current location SUB AX,OFFSET MENU_BUF ; minus start is offset STOSW ;Put word JMP FIND_WORD ;---------------------------------------------------------------------- ; The MEND command requires some cleanup to be performed. ; The length of the header is calculated and added to the offsets in ; the header. Then the menu_buf is appended to the output_buf. ;---------------------------------------------------------------------- TKN_12: CMP AL,_MEND JNE TKN_12AA ;If not MEND, move on ;---------------------------------------------------------------------- ; Close out the option block (if there was one). ;---------------------------------------------------------------------- MOV AL,_SEND ;Write send token CALL PUT_MENUBUF ;---------------------------------------------------------------------- ; Flush the buffers. ;---------------------------------------------------------------------- PUSH SI ;Save register MOV SI,MENU_HEAD ;Address of start of menu ; in the output file LODSW ;Number of entries in menu MOV CX,AX ;#Words = # entries * 3 SHL CX,1 ; *2 ADD CX,AX ; +1 is same as *3 JCXZ APPEND_TOKENS ;NULL menu bailout PUSH CX ;Save number words to update MOV AX,CX ;Length of offset INC AX ; plus one SHL AX,1 ; times two MOV CX,MENU_HEAD ;Offset of start of menu SUB CX,OFFSET OUTPUT_BUF ; from start of buf ADD AX,CX ; plus length of header POP CX UPDATE_POINTERS: ADD WORD PTR [SI],AX ; makes pointers correct INC SI ;Skip to next pointer INC SI LOOP UPDATE_POINTERS ;---------------------------------------------------------------------- ; Append the tokenized menu. ;---------------------------------------------------------------------- APPEND_TOKENS: MOV CX,BX ;End of menu buf MOV SI,OFFSET MENU_BUF ;start of menu buf SUB CX,SI ;# bytes to transfer REP MOVSB ;do it POP SI ;restore register ;---------------------------------------------------------------------- ; Reset the flags. ;---------------------------------------------------------------------- MOV MENU_FLAG,0 MOV OPTION_FLAG,0 JMP FIND_WORD ;get next command ;---------------------------------------------------------------------- ; Deal with commands other than PROGRAM, MENU, and OPTION ;---------------------------------------------------------------------- TKN_12AA: CALL PUT_MENUBUF ;Put the token in the file CMP AL,_EXECUTE ;If not execute JNE TKN_13 ; move on ;---------------------------------------------------------------------- ; EXECUTE command references another menu. Let the SEARCH_MENU_TABLE ; routine satisfy the reference, or leave a "wanted" message. ;---------------------------------------------------------------------- CALL NEXT_WORD ;Point to named menu CMP AL,CR ;End of line? JNE TKN_12A JMP TKN_8A ;(out of range jump) TKN_12A: CALL MAKEZ ;Put name in buffer MOV AX,0FFFFH ;= want address CALL SEARCH_MENU_TABLE ;Try and resolve JMP FIND_WORD ;---------------------------------------------------------------------- ; Separate out commands that take arguments. ;---------------------------------------------------------------------- TKN_13: CMP AL,_ASK ;Ask takes string JE TKN_17 CMP AL,_TYPE ;So does type JE TKN_17 JMP FIND_WORD ;Token already in, so go ;---------------------------------------------------------------------- ; These commads require the quoted string following them to be included ; as an ASCIIZ string following the command byte. ;---------------------------------------------------------------------- TKN_17: CALL NEXT_WORD ;Point to string CALL TKN_STRING ;Copy it JMP FIND_WORD TOKENIZE ENDP ;====================================================================== ; AX points to an ASCIIZ string. Look up that string in table pointed ; to by SI to see if we can find a match. ;---------------------------------------------------------------------- TABLE_LOOKUP PROC NEAR PUSH DI ;Save registers PUSH CX PUSH DX XOR CL,CL ;Command counter CL_0: CMP BYTE PTR [SI],0 ;End of table? JNZ CL_2 ; jump if not MOV CL,0FFH ;Signal error CL_1: MOV AL,CL ;Return cmd number POP DX ;Restore registers POP CX POP DI RET CL_2: MOV DI,AX ;Pointer to unknown command CALL STR_CMP ;NC if matched JNC CL_1 INC CL ;Point to next JMP CL_0 ;Test for table end TABLE_LOOKUP ENDP ;====================================================================== ; Compare strings at DI,SI where SI is a table. ;---------------------------------------------------------------------- STR_CMP PROC NEAR STR_1: MOV DL,[DI] ;Get char from string INC DI ;Point to next MOV DH,[SI] ;Get char from table INC SI ;Point to next CMP DH,DL ;If equal JE STR_3 ; jump DEC SI ;Backup in table STR_2: MOV DH,[SI] ;Examine char in table INC SI ;Goto next char OR DH,DH ;Is it end of entry? JNZ STR_2 ; no, continue scanning STC ; return with failure RET STR_3: OR DX,DX ;If both not 0 JNZ STR_1 ; continue compare CLC ; else, they match RET STR_CMP ENDP ;====================================================================== ; This procedure prints an error message and indicates the source line ; number on which it occured. ;---------------------------------------------------------------------- ERROR_EXIT PROC NEAR MOV AH,9 ;Print the error message INT 21H ; Thru DOS MOV DI,OFFSET LINE_NUM_BUF ;Put line number here MOV AX,SOURCE_LINE ;Contains line number MOV BX,10 ;Base 10 numbers LINE_LOOP: XOR DX,DX ;Divide DX:AX by BX DIV BX ADD DL,30H ;Make number into ASCII MOV [DI],DL ;Save it DEC DI ;Move toward more significant OR AX,AX ;If remainder not 0 JNZ LINE_LOOP ; continue MOV DX,OFFSET LINE_MSG ;Write message MOV AH,9 ;Display string fn INT 21H ; Thru DOS CALL CLOSE_FILES ;Close files and terminate MOV AX,4CFFH ; with error=255 INT 21H ; Thru DOS ERROR_EXIT ENDP ;====================================================================== ; Position SI to the begining of the next word. ;---------------------------------------------------------------------- NEXT_WORD PROC NEAR CALL IS_WHITE ;Is current char white? JNC NW_1 ; yes, jump CALL WHITE ; no, find first white NW_1: CALL NON_WHITE ;Scan for first non-white RET NEXT_WORD ENDP ;====================================================================== ; Enter with SI pointing to string. Position so SI points at first ; delimiter character AFTER the present char. Return char in AL. ; AL changed, SI moved by file routines. ;---------------------------------------------------------------------- WHITE PROC NEAR MOV AL,[SI] ;Check current char CMP AL,CR ; for EOL JE W_RET ; and leave W_LOOP: CALL GET_CHAR ;Get the next char CMP AL,CR ;If EOL JE W_RET ; return CALL IS_WHITE ;Returns NC if white JC W_LOOP W_RET: RET WHITE ENDP ;====================================================================== ; Enter with SI pointing to string. Position so SI points at first ; non-delimiter character AFTER the present char. Return char in AL. ; AL changed, SI moved by file routines. ;---------------------------------------------------------------------- NON_WHITE PROC NEAR MOV AL,[SI] ;Check current char CMP AL,CR ; for EOL JE NW_RET ; and leave NW_LOOP: CALL GET_CHAR ;Get the next char CMP AL,CR ;If EOL JE NW_RET ; return CALL IS_WHITE ;Returns NC if white JNC NW_LOOP NW_RET: RET NON_WHITE ENDP ;====================================================================== ; Examine Char at SI and return CY if non-white, NC if delimiter ; Only flags changed. ;---------------------------------------------------------------------- DELIMS DB " ,:",LF,TAB ;White chars IS_WHITE PROC NEAR PUSH AX ;Save registers PUSH CX PUSH DI MOV AL,[SI] ;Examine current char MOV CX,5 ;Number delims to compare MOV DI,OFFSET DELIMS ;Here they are REPNE SCASB ;Compare them CLC ;NC if delimiter JZ IW_1 ;ZR indicates match found STC ; else CY IW_1: POP DI ;Restore registers POP CX POP AX RET IS_WHITE ENDP ;====================================================================== ; Make the character in AL UPPER case. ;---------------------------------------------------------------------- MAKE_UC PROC NEAR CMP AL,'a' ;If between a and z JB UC_1 CMP AL,'z' JA UC_1 SUB AL,20H ;Make upper case UC_1: RET MAKE_UC ENDP ;====================================================================== ; Position SI to the next char after a CR. Start search with current ; char. ;---------------------------------------------------------------------- NEXT_LINE PROC NEAR MOV AL,[SI] ;Examine current char NL_1: CMP AL,CR ;Is it CR? JE NL_2 ; yes, jump CALL GET_CHAR ; no, get next char JMP NL_1 ; and try again NL_2: CALL GET_CHAR ;Go to first char after CR RET NEXT_LINE ENDP ;====================================================================== ; This proc helps resolve references to other menus made with ; EXECUTE commands. If entered with AX=FFFF, the calling procedure has ; a reference it needs to satisfy. If an address has been entered in ; the table for that name, the address is returned and the reference is ; satisfied. If not, a "IOU" is inserted in the table. ; If entered with AX != FFFFh, the calling procedure is supplying the ; starting address of the MENU named at PATH_BUF, and asking that these ; be entered into the table to satisfy a reference. If the name is found ; in the table, left in a previous bookmark, the reference is satisfied ; and the entry is marked "USED". Any further use of that name generates ; an error. ; For a forward reference, the structure is: ; ASCIIZ string ; WORD - Address of the start of the menu that ; contains the reference (menu_head) ; WORD - Offset from the end of menu header that ; is the destination for the fix-up ; For a POST: ; ASCIIZ string ; WORD - Address in output file of menu ; WORD - 0FFFFh ; Possibilities: ; 1) Post a MENU not previously requested ; 2) Post a MENU previously requested ; 3) Request a MENU previously posted ; 4) Ask for a MENU not previously posted ;---------------------------------------------------------------------- SEARCH_MENU_TABLE PROC NEAR PUSH SI ;Save used registers PUSH DI PUSH DX PUSH CX ;---------------------------------------------------------------------- ; AX=FFFF if request. AX != FFFF, then post the MENU address. ;---------------------------------------------------------------------- CMP AX,0FFFFH ;Switch = FFFF if request JE WANT_ADR ; to satisfy reference ;---------------------------------------------------------------------- ; AX contains the output file offset of a menu to post in this table. ; If the name is in the table, it was referenced earlier and we can go ; back and fix it up. If the name is NOT in the table, post it. ;---------------------------------------------------------------------- CALL MENU_LOOK ;Changes SI JNC SMT_7 ;Match was found if NC ;---------------------------------------------------------------------- ; 1) Post a menu not previously requested. No match found. Create a ; new entry for this menu. SI points to end of table. ; Copy the name from the buffer to the menu table. ;---------------------------------------------------------------------- INC NEW_REF ;Add a new reference MOV CX,0FFFFH ;POST code SMT_1: MOV DI,OFFSET PATH_BUF ;Name of MENU is here ;---------------------------------------------------------------------- ; Copy menu name to menu_name_table ;---------------------------------------------------------------------- SMT_5: MOV DL,[DI] ;Get char in DL INC DI ;Point to next MOV [SI],DL ;Save this char in table INC SI ;next destination OR DL,DL ;Was that last byte? JNZ SMT_5 ; no, get more ;---------------------------------------------------------------------- ; Make AX into offset from buffer start. Save in menu table. ; CX contains either offset from menu_buf of reference or FFFF (POST). ;---------------------------------------------------------------------- MOV WORD PTR [SI],AX ;Menu at this address MOV WORD PTR [SI][2],CX JMP SHORT SMT_EXIT ;clean up ;---------------------------------------------------------------------- ; 2) Post a MENU previously requested. SI points past the ASCIIZ name ; in the table to the location of the forward reference. ;---------------------------------------------------------------------- SMT_7: INC OLD_REF ;Add an old reference MOV DX,WORD PTR [SI][2] ;2nd word CMP DX,0FFFFH ; if POST, two menus have JE SMT_7B ; the same name (error) CMP DX,0FFFEH ;Already referenced JNE SMT_8 ; is also an error SMT_7B: MOV DX,OFFSET REF_MSG ;error JMP ERROR_EXIT SMT_8: ;---------------------------------------------------------------------- ; SI points to address of menu as offset from start of buffer. ; SI+2 points to additional offset from end of header. ; Address of reference is [si] + 2 + 3 * 2 * [[si]] + [si+2] ! ;---------------------------------------------------------------------- MOV DI,WORD PTR [SI] ;Offset into output_buf ADD DI,OFFSET OUTPUT_BUF ;Absolute memory location MOV CX,WORD PTR [DI] ;Number of entries in header SHL CX,1 ; 2 bytes per word ADD DI,CX INC CX ; 2 for first word SHL CX,1 ADD DI,CX ADD DI,WORD PTR [SI][2] MOV [DI],AX ; reference satisfied MOV WORD PTR [SI][2],0FFFEH ;Mark this entry USED JMP SHORT SMT_EXIT ;Clean up ;---------------------------------------------------------------------- ; Try and satisfy a reference. ;---------------------------------------------------------------------- WANT_ADR: CALL MENU_LOOK ;CY if no match JC SMT_9 ;---------------------------------------------------------------------- ; 3) Request a MENU previously posted. Entry name was in table. ;---------------------------------------------------------------------- DEC NEW_REF MOV DX,WORD PTR [SI][2] ;Second word CMP DX,0FFFFH ; should contain POST code JNE SMT_7B ;if not, ERROR! MOV AX,[SI] ;Get address of menu CALL PUT_MENUBUF ;Put lower byte MOV AL,AH CALL PUT_MENUBUF ;Put upper byte MOV WORD PTR [SI][2],0FFFEH ;Mark entry used JMP SHORT SMT_EXIT ;---------------------------------------------------------------------- ; 4) Ask for a MENU not previously posted. Put an IOU in the table. ;---------------------------------------------------------------------- SMT_9: DEC OLD_REF MOV AX,MENU_HEAD ;First entry is offset of SUB AX,OFFSET OUTPUT_BUF ; requesting menu MOV CX,BX ;Second entry is offset past SUB CX,OFFSET MENU_BUF ; the menu header ADD BX,2 ;Leave room for address JMP SMT_1 ;Go create table entry SMT_EXIT: POP CX ;Restore registers POP DX POP DI POP SI RET SEARCH_MENU_TABLE ENDP ;====================================================================== ; Look for a name in the menu. If carry is set, no match was found ; and SI points to the end of the table. If carry is clear, match was ; found and SI points to address word after entry. ; SI is changed. ;---------------------------------------------------------------------- MENU_LOOK PROC NEAR PUSH DI ;Save registers PUSH DX MOV SI,OFFSET MENU_NAME_TBL ;Known names ML_1: CMP BYTE PTR [SI],0 ;If 0, end of table JNE ML_3 ; else compare entry STC ;signal error ML_2: POP DX ;Restore registers POP DI RET ML_3: MOV DI,OFFSET PATH_BUF ;Name to find CALL STR_CMP ;CY if no match JNC ML_2 ;Return result ADD SI,4 ;Skip past addresses JMP ML_1 ;Check next table entry MENU_LOOK ENDP ;====================================================================== ; Interpret the contents of the quoted string and write to output buffer. ; Entered with SI pointing to the beginning quote. An illegal character ; or combination produces an error and terminates processing. ;---------------------------------------------------------------------- TKN_STRING PROC NEAR CMP BYTE PTR [SI],QUOTE ;Must point to quoted string JNE TS_ERR ; or syntax error. PUSH DI ;Save used register TS_1: MOV SHIFT_FLAGS,0 ;Clear shift flags TS_1AA: CALL GET_CHAR ;Get next char CMP AL,CR ;If not CR JNE TS_QUOTE ; go to next test TS_ERR: JMP SC_ERR ;Report a syntax error TS_QUOTE: CMP AL,QUOTE ;If quote JNE TS_1A TS_EXIT: XOR AL,AL ; make string asciiz CALL PUT_MENUBUF ; and write to buffer CALL NEXT_LINE ;Position to next line POP DI ;Restore register RET ; and leave TS_1A: CMP AL,"{" ;Key name follows JE SPEC_CHAR ;Go snif it out CMP SHIFT_FLAGS,0 ;If any shift keys on JNE DO_XLAT ; do translation XOR AH,AH ;Else, ASCII output of AL ;---------------------------------------------------------------------- ; If AH=0, output the code in AL; If AH != 0, output AH, then AL. ;---------------------------------------------------------------------- OUTPUT_CODE: OR AH,AH ;If AH=0 JZ OC_1 ; output AL only XCHG AH,AL ;Switch CALL PUT_MENUBUF ;Write the high byte XCHG AH,AL ;restore AL OC_1: CALL PUT_MENUBUF ;Put AL in buffer JMP TS_1 ;Get another character ;---------------------------------------------------------------------- ; These keys may be valid with CTRL and ALT, but not SHIFT ;---------------------------------------------------------------------- DO_XLAT: CMP SHIFT_FLAGS,_SHIFT ;Is SHIFT on? JNE TS_1B DEAD_KEY_ERROR: MOV DX,OFFSET DEAD_KEY_MSG ;Invalid key combo JMP ERROR_EXIT TS_1B: ;---------------------------------------------------------------------- ; See if the key is in the table. ;---------------------------------------------------------------------- CALL MAKE_UC ;Make upper case MOV AH,AL ;Save original char MOV DI,OFFSET KEY_TBL_1 ;Source for compare MOV CX,DI ;Save start of table TS_2: MOV AL,[DI] ;Get char from table INC DI ;Point to next OR AL,AL ;If 0, AL was illegal char JE DEAD_KEY_ERROR CMP AL,AH ;Do we have a match? JNE TS_2 ;No, try again DEC DI ;Backup pointer MOV AX,DI ;Have a match if here SUB AX,CX ;Offset into table ;---------------------------------------------------------------------- ; Found a match. Tediously calculate output byte. ;---------------------------------------------------------------------- CMP AL,25 ;If A-Z JBE IS_ALPHA ; process as alpha keys SUB AL,26 ;Remove alpha bias CMP SHIFT_FLAGS,_CTRL ;Go perform CTRL combos JE TS_4 ;These are ALT combos CMP AL,11 JA DEAD_KEY_ERROR ;Too high ADD AX,0FE78H ;Output 2 bytes JMP OUTPUT_CODE TS_4: ;CTRL combos SHL AL,1 ;multiply by 2 MOV DI,OFFSET KEY_TBL_2 ADD DI,AX ;Find word in table MOV AX,[DI] ;Load into AX OR AX,AX ;If zero JZ DEAD_KEY_ERROR ; this combo not allowed JMP OUTPUT_CODE ; else write it ;---------------------------------------------------------------------- ; CTRL/ALT alphabet combinations. ;---------------------------------------------------------------------- IS_ALPHA: CMP SHIFT_FLAGS,_ALT JE TS_5 INC AL ;ALT is simple, add 1 JMP OUTPUT_CODE TS_5: MOV DI,OFFSET KEY_TBL_3 ;CTRL keys combos ADD DI,AX ;Add offset to MOV AL,[DI] ; get char code MOV AH,0FEH ;Signal extended ASCII JMP OUTPUT_CODE ;Send it to buffer ;---------------------------------------------------------------------- ; Here the {strings} are translated to their equivalent keystrokes. ; Move the key name into the ASCIIZ buffer. ;---------------------------------------------------------------------- SPEC_CHAR: MOV DI,OFFSET PATH_BUF SC_1: CALL GET_CHAR ;Get char inside brace CMP AL,'{' ;If doubled, use { JNE SC_2 ;Jump for other chars CMP DI,OFFSET PATH_BUF ;If = no chars have been JE OC_1 ; processed yet. {{ SC_ERR: MOV DX,OFFSET SYNTAX_MSG JMP ERROR_EXIT SC_2: CMP AL,QUOTE ;If char is quote JE SC_ERR CMP AL,'}' ;Close brace? JE SC_3 ; go search table CALL MAKE_UC ;Make Upper case STOSB ;Put char in buffer JMP SC_1 ;Continue to copy key name SC_3: XOR AL,AL ;Make asciiz STOSB PUSH SI ;Save register MOV SI,OFFSET KEY_NAME_TBL ;Search this table MOV AX,OFFSET PATH_BUF ; for this entry CALL TABLE_LOOKUP POP SI ;Restore register ;---------------------------------------------------------------------- ; Return # of entry in table or FFh if not found. ;---------------------------------------------------------------------- CMP AL,0FFH JE SC_ERR OR AL,AL ;0 = Turn SHIFT on JNZ SC_4 MOV SHIFT_FLAGS,_SHIFT JMP TS_1AA SC_4: DEC AL ;0 = Turn CTRL on JNZ SC_5 MOV SHIFT_FLAGS,_CTRL JMP TS_1AA SC_5: DEC AL ;0 = Turn ALT on JNZ SC_6 MOV SHIFT_FLAGS,_ALT JMP TS_1AA ;---------------------------------------------------------------------- ; Test for the Function keys (40 combinations). ;---------------------------------------------------------------------- SC_6: DEC AL ;Adjust key number CMP AL,9 ;Keys 0-9 JA SC_10 ;Can't be function key ADD AL,3BH ;Key code MOV AH,SHIFT_FLAGS ;Test for shift states CMP AH,_SHIFT ;For shift JNE SC_7 ADD AL,19H ;Add 19h SC_7: CMP AH,_CTRL ;For CTRL JNE SC_8 ADD AL,23H ;Add 23h SC_8: CMP AH,_ALT ;For ALT JNE SC_9 ADD AL,2DH ;Add 2dh SC_9: MOV AH,0FEH ;Say this is extended ascii JMP OUTPUT_CODE ;Dump the bytes ;---------------------------------------------------------------------- ; ALT is not allowed for these keys. ;---------------------------------------------------------------------- SC_10: CMP SHIFT_FLAGS,_ALT ;If Alt's not on JNE SC_10B ; jump SC_10A: JMP DEAD_KEY_ERROR ; else, error SC_10B: SUB AL,10 ;Eliminate BIAS JNZ SC_11 MOV AL,01BH ;ESC key JMP OC_1 SC_11: DEC AL ;TAB key JNZ SC_13 CMP SHIFT_FLAGS,0 ;Any shift keys on? JE SC_12 ; no, jump CMP SHIFT_FLAGS,_SHIFT ;SHIFT only is allowed JNE SC_10A ; else error MOV AX,0FE0FH ;SHIFT-TAB JMP OUTPUT_CODE ;to output SC_12: MOV AL,9 ;Normal TAB SC_12A: JMP OC_1 ;---------------------------------------------------------------------- ; These keys are the same alone or with SHIFT, but CTRL is different. ;---------------------------------------------------------------------- SC_13: DEC AL ;Remove bias XOR AH,AH ;Zero AH MOV DI,OFFSET KEY_TBL_4 ;Table of SHIFT/CTRL values SHL AX,1 ;Make into offset ADD DI,AX ; from start of table MOV DH,SHIFT_FLAGS ;If CTRL CMP DH,_CTRL JNE SC_14 INC DI ; move one byte further SC_14: MOV DL,[DI] ;Get char from table OR DL,DL ; =0 if illegal JZ SC_10A XCHG AL,DL ;Put offset in DL CMP DL,2 ;What key? JE SC_12A ;If BS, all ascii JA SC_15 ;above, all extended CMP DH,_CTRL ;CTRL-ENTER is special JNE SC_12A SC_15: MOV AH,0FEH ;Add extended code JMP OUTPUT_CODE TKN_STRING ENDP ;====================================================================== ; Read from the BDF file into a buffer. If an EOF is found, perform ; the final cleanup and return to the main procedure. ; (must also keep track of file pointer and signal when EOF) ;---------------------------------------------------------------------- REFRESH_BUFFER PROC NEAR PUSH BX PUSH CX PUSH DX MOV AH,42H ;Move file pointer XOR AL,AL ; offset from begining MOV BX,INPUT_HNDL ;File handle XOR CX,CX ;Offset CX:DX MOV DX,INPUT_HNDL_PTR INT 21H ;Thru DOS JC READ_ERR ;---------------------------------------------------------------------- ; Fill buffer. ;---------------------------------------------------------------------- MOV AH,3FH ;Read from handle fn MOV BX,INPUT_HNDL MOV CX,INPUT_BUF_LEN ;Number bytes to read MOV SI,OFFSET INPUT_BUF MOV DX,SI ;DS:DX destination CMP [INPUT_HNDL_PTR],0 ;If start of file JNE NOT_FIRST_READ MOV BYTE PTR [SI],20H ;Make a current char DEC CX ;Read one less byte INC DX ;New destination NOT_FIRST_READ: INT 21H ;Thru DOS JNC READ_OK READ_ERR: MOV DX,OFFSET READ_MSG JMP ERROR_EXIT READ_OK: ADD INPUT_HNDL_PTR,AX ;Add bytes read SUB DX,SI ;Calculate ending address ADD AX,DX ; of our buffer MOV INPUT_BUF_END,AX ; and save it POP DX ;Restore registers POP CX POP BX RET REFRESH_BUFFER ENDP ;====================================================================== ; Copy the word at SI into a buffer and make it asciiz ;---------------------------------------------------------------------- MAKEZ PROC NEAR PUSH DI MOV DI,OFFSET PATH_BUF ;Destination PUSH DI MZ_1: CALL IS_WHITE ;Examine char at SI JNC MZ_2 MOV AL,[SI] ;Get the char CMP AL,CR ;Is it CR? JE MZ_2 ; yes, terminate string CALL MAKE_UC ; else, change to lower case STOSB ; save at DI CALL GET_CHAR ;Get next char JMP MZ_1 MZ_2: XOR AL,AL ;Make ASCIIZ STOSB POP AX ;Return buffer address POP DI ;Restore pointer RET MAKEZ ENDP ;====================================================================== ; Get a char from the input buffer. If past the end of the buffer, ; refresh the buffer. Check for EOF (SI = INPUT_BUF_END != BUF_LEN) ; If comments are detected, they are weeded out. ;---------------------------------------------------------------------- COMMENT_FLAG DB 0 ;=1 if inside comment GET_CHAR PROC NEAR ;---------------------------------------------------------------------- ; Check buffer for pointer past end. ;---------------------------------------------------------------------- PUSH AX ;Save register INC SI ;Advance pointer MOV AX,SI ;Current location SUB AX,OFFSET INPUT_BUF ; minus start CMP AX,INPUT_BUF_END ; longer than allowed POP AX ;(restore pointer) JB GC_1 ; no need to refresh CALL REFRESH_BUFFER ;Attempt to load buffer ;---------------------------------------------------------------------- ; AX contains the number of chars read. If AX=0, unexpected EOF. ;---------------------------------------------------------------------- OR AX,AX ;# chars read JNZ GC_1 ;jump if not 0 MOV DX,OFFSET EOF_MSG JMP ERROR_EXIT ;---------------------------------------------------------------------- ; check for, and eliminate comments ;---------------------------------------------------------------------- GC_1: MOV AL,[SI] ;Get new char CMP AL,CR ;If new line JNE GC_3 MOV COMMENT_FLAG,0 ; reset comment INC SOURCE_LINE ; next line GC_2: CMP COMMENT_FLAG,0 ;If inside comment JNE GET_CHAR ; read until CR RET GC_3: CMP AL,';' ;If this isn't a comment JNE GC_2 ; then continue INC COMMENT_FLAG ;else read until CR JMP GET_CHAR GET_CHAR ENDP ;====================================================================== PUT_MENUBUF PROC NEAR MOV [BX],AL ;Write byte to [bx] INC BX ;Move pointer RET PUT_MENUBUF ENDP ;====================================================================== ; Buffer Allocation area ;---------------------------------------------------------------------- PC = $ LAST_BYTE = PC PATH_BUF = PC ;DB 64 DUP (?) PC = PC + 64 INPUT_BUF = PC ;DB INPUT_BUF_LEN DUP(?) PC = PC + INPUT_BUF_LEN OUTPUT_BUF = PC ;DB OUTPUT_BUF_LEN DUP(?) PC = PC + OUTPUT_BUF_LEN MENU_BUF = PC ;DB MENU_BUF_LEN DUP(?) PC = PC + MENU_BUF_LEN MENU_NAME_TBL = PC ;DB MENU_TBL_ELN DUP(?) PC = PC + MENU_TBL_LEN ;---------------------------------------------------------------------- CSEG ENDS END ENTPT