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Simtel MSDOS 1992 September
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Simtel20_Sept92.cdr
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makebas.arc
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MAKEBAS.ASM
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Assembly Source File
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1988-09-27
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41KB
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777 lines
PAGE 59,132
TITLE MAKEBAS - Create .BAS source to recreate a file
;----------------------------------------------------------------------
; MAKEBAS.ASM
;
; Author..: Salvatore P. Ricciardi
; Version.: 01.00
;
; Creates .BAS files to use when creating the PC Magazine utilities.
;----------------------------------------------------------------------
page
;----------------------------------------------------------------------
;--- EQUATES, RECORDS and STRUCTURES
;----------------------------------------------------------------------
LF EQU 0AH ;line feed
CR EQU 0DH ;carriage return
BYTES_LINE EQU 16D ;bytes per line of data
LINE_INCR EQU 10D ;line number increment
LASTBASIC EQU 260D ;last basic statement
;before data statements
STACKSAVE EQU 200D ;stack requirement
;----------------------------------------------------------------------
;--- CODE
;----------------------------------------------------------------------
CSEG SEGMENT PARA PUBLIC 'CODE'
ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING
ORG 100h ;Starting offset for .COM files
ENTRY: JMP START ;Jump to start
COPYRIGHT DB "MAKEBAS 1.0 (C) 1988 Ziff Communications Co.",CR,LF
DB "PC Magazine ",254," Salvatore P. Ricciardi",CR,LF
DB CR,LF,"$"
USAGE DB "Usage: MAKEBAS [d:][\path\]filename[.ext]",CR,LF,"$"
DB 1AH
BASIC_CODE DB "100 REM - BASIC PROGRAM TO CREATE "
FLNAME DB 12 DUP(" "),CR,LF
DB "110 CLS:PRINT ""Creating "
FLNAME0 DB 12 DUP(" ")
DB """: OPEN """
FLNAME1 DB 12 DUP(" ")
DB """ AS #1 LEN = 1",CR,LF
DB "120 FIELD #1, 1 AS A$: CHECKSUM#=0",CR,LF
DB "130 FOR I = 1 TO "
LINECOUNT DB 5 DUP(" "),CR,LF
DB "140 LINESUM#=0: LOCATE 2,3: "
DB "PRINT ""Countdown: "" "
COUNTDOWN DB 5 DUP(" ")," - I ;",CR,LF
DB "150 FOR J = 1 TO "
B_PER_LINE DB 3 DUP(" "),": READ BYTE$: "
DB "CHECKSUM#=CHECKSUM#+VAL(""&H""+BYTE$)"
DB CR,LF
DB "160 LINESUM#=LINESUM#+VAL(""&H""+BYTE$)",CR,LF
DB "170 IF (BYTE < 256) THEN LSET A$=CHR$"
DB "(VAL(""&H""+BYTE$)): PUT #1",CR,LF
DB "180 NEXT J",CR,LF
DB "190 READ LINETOT$: LINECHECK# = VAL(""&H""+LINETOT$)"
DB CR,LF
DB "200 IF LINECHECK# = LINESUM# THEN GOTO 220",CR,LF
DB "210 LOCATE 4,2: PRINT ""Error in line #"" ;"
ALASTBAS DB 5 DUP(" ")," + "
AINCR DB 3 DUP(" ")," * I: GOTO 260",CR,LF
DB "220 NEXT I",CR,LF
DB "230 CLOSE: READ FILETOT$ : FILECHECK# = VAL(FILETOT$)"
DB CR,LF
DB "240 IF CHECKSUM# <> FILECHECK# THEN GOTO 260",CR,LF
DB "250 PRINT: PRINT """
FLNAME2 DB 12 DUP(" ")
DB " created successfully"": SYSTEM",CR,LF
DB "260 PRINT: PRINT """
FLNAME3 DB 12 DUP(" ")
DB " is not valid!"": END",CR,LF
BASICLEN EQU $-BASIC_CODE ;sum length of basic lines
BASICDATA DB 5 DUP(" ") ;space for the line number
DB " DATA " ;these are DATA statements
BBUFFER DB ((BYTES_LINE*4)+7) DUP(" ")
BASICDATAL EQU $-BASICDATA ;Length for the write
ERRORLVL DB 0 ;Return code
FNSTART DW 0 ;offset of filename on cmdline
LINENUMBER DW 0 ;line number
SRCFILE DB ".COM",0 ;default file extent
SRCFLEN EQU $-SRCFILE ;length for mov
SRCHANDLE DW ? ;file handle when opened
BASFILE DB ".BAS",0 ;file extent for BAS file
BASFLEN EQU $-BASFILE ;length for mov
BASHANDLE DW 0 ;file handle when opened
EXISTSMSG DB ".BAS file" ;message when file exists
DB " already exists. Overwrite (y/n)? :","$"
LINERROR DB "MAKEBAS: Error, line number too big",CR,LF,"$"
SRCERROR DB "MAKEBAS: Source file error",CR,LF,"$"
BASERROR DB "MAKEBAS: .BAS file error",CR,LF,"$"
NOMEMORY DB "MAKEBAS: Not enough memory",CR,LF,"$"
WORKING_MSG DB " Working...","$"
DONE_MSG DB "Done",CR,LF,"$"
CRLF_MSG DB CR,LF,"$"
SRCCKSUM DD 0 ;dword for checksum
;
; Start of main code section
;
START: MOV DX,OFFSET COPYRIGHT ;copyright message
MOV AH,09H ;display string
INT 21H ;dos interrupt
;
; Check and ensure that there is adequate memory
;
CMP SP,(OFFSET BUFFER-OFFSET CSEG+BYTES_LINE+STACKSAVE)
JA START1 ;yes, lets continue
MOV AH,09H ;no, display message
MOV DX,OFFSET NOMEMORY ;"not enough memory"
INT 21H ;dos interrupt
JMP RETURN_TO_DOS ;go end
START1: CLD ;forward direction
XOR AX,AX ;clear ax
MOV AL,DS:[80H] ;get parm count
CMP AL,1 ;is it more than one?
JA GOTPARM ;yes, go handle
JMP HELP ;no, display usage and quit
;
; Remove blanks or tabs from the end of the filespec by replacing
; them with binary zero. Skip leading spaces and tabs also.
;
GOTPARM: MOV DI,AX ;use di
INC AX ;start with count+1
MOV CX,AX ;put in cx
GOTPARM1: MOV BYTE PTR DS:[80H+DI+1],0 ;make asciiz
DEC CX ;decrement cx
JNZ GOTPARM3 ;not zero then continue
JMP HELP ;none left, give usage message
GOTPARM3: DEC DI ;back up one
CMP BYTE PTR DS:[80H+DI+1]," " ;is last byte a space?
JE GOTPARM1 ;yes, null it out
CMP BYTE PTR DS:[80H+DI+1],09H ;is last byte a tab?
JE GOTPARM1 ;yes, null it out
GOTPARM4:
MOV SI,80H ;set start
GOTPARM5:
INC SI ;skip spaces and tabs
CMP BYTE PTR DS:[SI]," " ;a space?
JNE GOTPARM6 ;no
DEC CX ;back it out
JMP GOTPARM5 ;yes
GOTPARM6:
CMP BYTE PTR DS:[SI],09H ;a tab?
JNE GOTPARM7 ;no
DEC CX ;back it out
JMP GOTPARM5 ;yes
GOTPARM7:
MOV BYTE PTR DS:[80H],CL ;store adjusted length
MOV FNSTART,SI ;save start of filename
CALL STRUPPER ;make uppercase
;
; If no file extent is present, use .COM as the default
;
CHECKCOM: MOV CL,BYTE PTR DS:[80H] ;get length
MOV DI,SI ;set start
MOV AL,"." ;look for start of extension
REPNE SCASB ;is it there?
MOV BX,DI ;save location in bx
JNE MAKECOM ;no extent, use default
DEC BX ;adjust to point to the "."
JMP SHORT OPENSRC ;go open the file
MAKECOM: MOV CX,SRCFLEN ;length of string
MOV SI,OFFSET SRCFILE ;".COM,0"
REP MOVSB ;move in the default
; ;extent (.COM)
; OPEN the source file for reading
;
OPENSRC: MOV DX,FNSTART ;get start of filename
MOV AX,3D00H ;open for reading
INT 21H ;dos interrupt
JNC OPENCOK ;no carry means success
MOV ERRORLVL,2 ;set errorlevel
MOV DX,OFFSET SRCERROR ;error message
MOV AH,09H ;display string
INT 21H ;dos interrupt
JMP RETURN_TO_DOS ;carry means error
OPENCOK: MOV SRCHANDLE,AX ;save handle
;
; Isolate the filename.ext portion of the pathspec
;
MOV DI,FNSTART ;set for parsing
CALL FILENAME ;look for filename.ext only
;
; Move the filename.ext into the appropriate places in the BASIC
; statements
;
SAVNAME: MOV SI,DI ;get from position in si
MOV AX,SI ;save move from position in ax
MOV DX,CX ;save length in dx
MOV DI,OFFSET FLNAME ;where to put filename
REP MOVSB ;move in flname
MOV SI,AX ;get back from position
MOV CX,DX ;get back length
MOV DI,OFFSET FLNAME0 ;where to put filename
REP MOVSB ;move in flname1
MOV SI,AX ;get back from position
MOV CX,DX ;get back length
MOV DI,OFFSET FLNAME1 ;where to put filename
REP MOVSB ;move in flname1
MOV SI,AX ;get back from position
MOV CX,DX ;get back length
MOV DI,OFFSET FLNAME2 ;where to put filename
REP MOVSB ;move in flname2
MOV SI,AX ;get back from position
MOV CX,DX ;get back length
MOV DI,OFFSET FLNAME3 ;where to put filename
REP MOVSB ;move in flname3
;
; Now change file extent to .BAS and try to open for writing.
; If this works, a .BAS file with the same name already exists
;
MAKEBAS: MOV CX,BASFLEN ;count in cx
MOV DI,BX ;restore position of extent
MOV SI,OFFSET BASFILE
REP MOVSB ;move in .bas extent
XOR BX,BX ;clear bx for later
OPENBAS: MOV DX,FNSTART ;offset of filename
MOV AX,3D01H ;open file for writing
INT 21H ;dos interrupt
JC CREATEBAS ;if this fails, go create file
MOV BASHANDLE,AX ;save file handle
;
; If the .BAS file already exists, ask before overwriting
;
MOV DX,OFFSET EXISTSMSG ;File exists, write over?
MOV AH,09H ;display string
INT 21H ;dos interrupt
GETANS: MOV AX,0100H ;DOS read kybd and echo
INT 21H ;dos interrupt
AND AL,0DFH ;make uppercase
OR AL,AL ;is it extended key?
JE GETANS ;go get the keycode
PUSH AX ;save key
MOV DX,OFFSET CRLF_MSG ;put out a CRLF combo
MOV AH,09H ;display string
INT 21H ;dos interrupt
POP AX ;get back key
CMP AL,"Y" ;is it yes?
JE OVERWRITE ;yes, continue
JMP CLOSFILES ;no, go quit
;
; To overwrite the existing file, close it and then create it using
; function 3CH
;
OVERWRITE:
MOV DX,OFFSET CRLF_MSG ;put out a CRLF combo
MOV AH,09H ;display string
INT 21H ;dos interrupt
MOV AX,3E00H ;close file handle request
MOV BX,BASHANDLE ;handle for .BAS file
INT 21H ;close the file
;
; Create the .BAS file
;
CREATEBAS: MOV DX,FNSTART ;offset of filename
XOR CX,CX ;attribute normal
MOV AX,3C00H ;create file
INT 21H ;dos interrupt
JNC CREATOK ;no carry means success
MOV ERRORLVL,1 ;set errorlevel
MOV DX,OFFSET BASERROR ;error message
MOV AH,09H ;display string
INT 21H ;dos interrupt
MOV AX,3E00H ;close file handle request
MOV BX,SRCHANDLE ;close the source file
INT 21H ;dos interrupt
JMP RETURN_TO_DOS ;go end
CREATOK: MOV BASHANDLE,AX ;save file handle
;
; Display "Working" message
;
MOV DX,OFFSET WORKING_MSG ;"Working" message
MOV AH,09H ;display string
INT 21H ;dos interrupt
;
; Calculate the number of DATA lines required
;
NUMLINES: ;Get the file size in bytes
MOV AX,4202H ;move file pointer
MOV BX,SRCHANDLE ;file handle for com file
XOR CX,CX ;seek to eof
XOR DX,DX ;clear
INT 21H ;dos interrupt
JNC NUMLINES1 ;no carry means ok
MOV ERRORLVL,5 ;set errorlevel
MOV DX,OFFSET SRCERROR ;error message
JMP ERROREXIT ;carry means error
NUMLINES1: XOR BX,BX ;clear BX
MOV BL,BYTES_LINE ;bytes per line
DIV BX ;calculate number of lines
OR DX,DX ;any remainder?
JZ NUMLINES2 ;no, go ahead
INC AX ;yes, one more line
;
; Convert values to ascii decimal and store in the BASIC statements
;
NUMLINES2: MOV DI,OFFSET LINECOUNT ;store no. 1f lines in ascii
XOR DX,DX ;high is zero, low in ax
MOV BX,10D ;decimal radix
MOV CX,5D ;width of output field
CALL BTOA ;convert to ascii
MOV DI,OFFSET COUNTDOWN ;store no. 1f lines in ascii
MOV CX,5D ;width of output field
CALL BTOA ;convert to ascii
MOV DI,OFFSET B_PER_LINE ;store bytes per line in ascii
MOV AX,BYTES_LINE ;low is bytes per line
MOV CX,3D ;width of output field
CALL BTOA ;convert to ascii
MOV DI,OFFSET ALASTBAS ;store last line no. in ascii
MOV AX,LASTBASIC ;low is bytes per line
MOV CX,5D ;width of output field
CALL BTOA ;convert to ascii
MOV DI,OFFSET AINCR ;store line increment
XOR AX,AX ;clear AX
MOV AL,LINE_INCR ;low is bytes per line
MOV CX,3D ;width of output field
CALL BTOA ;convert to ascii
;
; Write everything except the DATA statements to the .BAS file
;
WRITESOME: MOV DX,OFFSET BASIC_CODE ;start of text
MOV CX,BASICLEN ;length of write
MOV BX,BASHANDLE ;handle for basic file
CALL WRITE_HANDLE ;write to handle
JNC STARTDATA ;no carry means ok
MOV ERRORLVL,4 ;set errorlevel
MOV DX,OFFSET BASERROR ;error message
JMP ERROREXIT ;carry means error
;
; Seek back to the beginning of the source file in order to create
; the DATA statements
;
STARTDATA: MOV AX,4200H ;move file pointer
MOV BX,SRCHANDLE ;file handle for com file
XOR CX,CX ;seek to 0:0
XOR DX,DX
INT 21H ;dos interrupt
JNC DATALOOP ;no carry means ok
MOV ERRORLVL,5 ;set errorlevel
MOV DX,OFFSET SRCERROR ;error message
JMP ERROREXIT ;jump to error exit
;
; Create the DATA statements
;
DATALOOP: MOV CX,BYTES_LINE ;read BYTES_LINE bytes
CALL READDATA ;read into the buffer
JNC DATALOOP1 ;no carry means ok
MOV ERRORLVL,3 ;set errorlevel
MOV DX,OFFSET SRCERROR ;error message
JMP ERROREXIT ;jump to error exit
DATALOOP1: OR AX,AX ;zero bytes read?
JZ FINISHED ;yes, finished
INC LINENUMBER ;increment line counter
CALL LINENUM ;put out line number
JNC DATALOOP2 ;no carry means ok
MOV ERRORLVL,6 ;set errorlevel
MOV DX,OFFSET LINERROR ;error message
JMP ERROREXIT ;jump to error exit
DATALOOP2: MOV CX,AX ;number of bytes from ax
CALL MAKEDATA ;go make data statement
MOV CX,BASICDATAL ;length of write
CALL WRITEDATA ;write out data statement
JNC DATALOOP ;go do some more
MOV ERRORLVL,4 ;set errorlevel
MOV DX,OFFSET BASERROR ;error message
JMP ERROREXIT ;jump to error exit
;
; Convert the checksum to decimal ascii and store in the final data
; statement
;
FINISHED: INC LINENUMBER ;increment line counter
CALL LINENUM ;put out line number
MOV DI,OFFSET BBUFFER ;store byte sum in ascii
PUSH DI ;save a moment
MOV DX,WORD PTR SRCCKSUM+2
MOV AX,WORD PTR SRCCKSUM ;low in ax, high in dx
MOV BX,10D ;decimal radix
MOV CX,11D ;width of output field
CALL BTOA ;convert to ascii
MOV SI,DI ;get address in si
POP DI ;restore buffer address
REP MOVSB ;move flush left
MOV AL,CR ;end of line
STOSB ;store the byte
MOV AL,LF ;end of line
STOSB ;store the byte
MOV CX,DI ;position in cx
SUB CX,OFFSET BASICDATA ;calculate length
FINISHED2:
CALL WRITEDATA ;write out data statement
JNC DISPDONE ;go do some more
MOV ERRORLVL,4 ;set errorlevel
MOV DX,OFFSET BASERROR ;error message
JMP ERROREXIT ;jump to error exit
;
; Display "Done" message
;
DISPDONE:
MOV AH,09H ;display message
MOV DX,OFFSET DONE_MSG ;"Done" message
INT 21H ;dos interrupt
;
; Close both files
;
CLOSFILES:
MOV AX,3E00H ;close file handle request
MOV BX,SRCHANDLE ;close the source file
INT 21H ;dos interrupt
MOV AX,3E00H ;close file handle request
MOV BX,BASHANDLE ;close the source file
INT 21H ;dos interrupt
;
; Set errorlevel and return to dos
;
RETURN_TO_DOS:
MOV AH,04CH ;terminate process
MOV AL,ERRORLVL ;get return code
INT 21H ;return to dos
;
; Error exit - display message, close files and terminate
;
ERROREXIT:
MOV AH,09H ;display string
INT 21H ;dos interrupt
JMP CLOSFILES ;go close and end
HELP: MOV DX,OFFSET USAGE ;usage message
MOV AH,09H ;display string
INT 21H ;dos interrupt
JMP RETURN_TO_DOS
;----------------------------------------------------------------------
; WRITEDATA - Write out a data statement. Entry: CX has bytecount.
; This routine removes leading blanks from the linenumbers.
;----------------------------------------------------------------------
WRITEDATA PROC NEAR
MOV SI,OFFSET BASICDATA ;start of data statement
;
; Scan past leading blanks...
;
WRITED001: CMP BYTE PTR DS:[SI]," " ;is it a blank?
JNE WRITED002 ;no, go write
INC SI ;skip the blank
DEC CX ;count - 1
JMP WRITED001 ;check next char
WRITED002: MOV DX,SI ;start position in DX
MOV BX,BASHANDLE ;handle for basic file
CALL WRITE_HANDLE ;write to handle
RET
WRITEDATA ENDP
;----------------------------------------------------------------------
; LINESUM - Convert line sum to ascii decimal and put in data
; statement followed by CR,LF. Entry: Line sum in BX
;----------------------------------------------------------------------
LINESUM PROC NEAR ;create line checksum
ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING
PUSH DI ;save di
MOV CX,5 ;blank fill first
MOV AL," "
REP STOSB
POP DI ;restore di
XOR DX,DX ;high is zero
MOV AX,BX ;low is line sum
OR AX,AX ;is it zero?
JNZ LINESUM1 ;no, continue
MOV AX," " ;lead with blanks
STOSW
STOSB
MOV AX,"0 " ;put out zero
STOSW
JMP SHORT LINESUM2
LINESUM1: ADD WORD PTR SRCCKSUM,AX ;add to the
ADC WORD PTR SRCCKSUM+2,DX ;file checksum
PUSH DI ;save it again
MOV BX,16D ;hexadecimal radix
MOV CX,5D ;width of buffer
CALL BTOA ;go convert to ascii
POP DI ;get it back
ADD DI,5 ;point past line sum
LINESUM2: MOV AL,CR ;end of line
STOSB ;store the byte
MOV AL,LF ;end of line
STOSB ;store the byte
RET
LINESUM ENDP
;----------------------------------------------------------------------
; READDATA - Reads CX bytes from source file into buffer.
; Exit: AX contains number of bytes read
; If error occurred, carry set and AX contains error code
;----------------------------------------------------------------------
READDATA PROC NEAR ;read BYTES_LINE bytes
ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING
PUSH BX ;save registers
PUSH DX
MOV AX,3F00H ;read from file handle
MOV BX,SRCHANDLE ;handle for COM file
MOV DX,OFFSET BUFFER ;address of buffer
INT 21H ;get em from dos
POP DX ;restore registers
POP BX
RET
READDATA ENDP
;----------------------------------------------------------------------
; WRITE_HANDLE - Write to file handle.
; Input: DS:DX addresses buffer. CX has bytecount.
; BX has file handle.
; Exit: AX has count written unless carry is set, in which case
; an error code is in AX.
;----------------------------------------------------------------------
WRITE_HANDLE PROC NEAR ;write to file handle
ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING
PUSH CX ;save just in case
MOV AH,40H ;write to handle function
INT 21H ;dos interrupt
POP CX ;get back cx
JC WRITE_HRET ;carry set, return immediately
CMP AX,CX ;did we write them all?
JE WRITE_HRET ;yes, go return
STC ;no, set carry
WRITE_HRET:
RET
WRITE_HANDLE ENDP
;----------------------------------------------------------------------
; MAKEDATA - Creates a BASIC data statement containing the next CX
; bytes in hexadecimal, followed by a line sum.
; Entry: CX - byte count.
;----------------------------------------------------------------------
MAKEDATA PROC NEAR ;make a basic data statement
ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING
MOV BP,CX ;save byte count in bp
MOV DI,OFFSET BBUFFER ;start of ascii buffer
MOV SI,OFFSET BUFFER ;start of data buffer
XOR AX,AX ;start with clear ax
XOR BX,BX ;sixteen byte sum in bx
MAKE00010: LODSB ;get byte in AL
ADD BX,AX ;add to sum
CALL PUTHEX ;put out al in hex
MOV AX," ," ;need a comma and space
STOSW ;store the byte
XOR AH,AH ;clear AH
LOOP MAKE00010 ;loop
CMP BP,BYTES_LINE ;was this a complete line
JE MAKE01000 ;yes, then go finish up
MOV CX,BYTES_LINE ;calculate padding
SUB CX,BP ;requirement
MAKE00200: MOV AX,"0 " ;pad with zeros
STOSW ;move them in
MOV AX," ," ;comma and space
STOSW ;move it in
LOOP MAKE00200 ;continue until finished
MAKE01000: CALL LINESUM ;convert and put out linesum
;and cr,lf
RET
MAKEDATA ENDP
;----------------------------------------------------------------------
; PUTHEX - Output AL in hexadecimal to ES:DI. Replace a leading zero
; with a space
;----------------------------------------------------------------------
PUTHEX PROC NEAR ;output al in hex to es:di
ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING
PUSH AX ;save a moment
SHR AL,1 ;isolate high nibble
SHR AL,1
SHR AL,1
SHR AL,1
JZ PUTHEX1 ;jump if zero
ADD AL,90H ;convert al
DAA ;to hex
ADC AL,40H
DAA
STOSB ;store the byte
JMP PUTHEX2
PUTHEX1: MOV AL," " ;zero suppress
STOSB ;store the byte
PUTHEX2: POP AX ;get back original
AND AL,0FH ;isolate low nibble
ADD AL,90H ;convert al
DAA ;to hex
ADC AL,40H
DAA
STOSB ;store the byte
RET
PUTHEX ENDP
;----------------------------------------------------------------------
; LINENUM - Calculate a new line number for the data statement and
; move it in. Exit: Carry set if too many lines
;----------------------------------------------------------------------
LINENUM PROC NEAR ;create line number
ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING
PUSH AX ;save ax
PUSH DI ;save di
PUSH CX ;and cx
CLC ;clear carry
MOV CX,LINENUMBER ;get current line number
XOR DX,DX ;high is zero
MOV AX,LINE_INCR ;multiply by line increment
MUL CX
JC LINENUME ;carry means too many
ADD AX,LASTBASIC ;add last basic statement no.
JC LINENUME ;carry means too many
MOV DI,OFFSET BASICDATA ;where to put lineno
XOR DX,DX ;clear high word, low is in ax
MOV BX,10D ;radix is decimal
MOV CX,5D ;width of field
CALL BTOA ;convert to ascii
CLC ;make sure carry is clear
LINENUME: POP CX ;restore cx
POP DI ;restore di
POP AX ;restore ax
RET
LINENUM ENDP
;----------------------------------------------------------------------
; FILENAME - Find filename.ext in a full path specification.
; Entry: ES:DI points to asciiz full path specification.
; Exit: ES:DI points to the name.ext only.
; CX contains the length of the name.ext in bytes.
; Carry flag set if error occurs (ES:DI, CX not valid).
;----------------------------------------------------------------------
FILENAME PROC NEAR ;find the name and extent
ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING
PUSH AX ;save AX
XOR AX,AX ;zero out AX
MOV CX,0FFFFH ;maximum search
CLD ;set direction forward
REPNE SCASB ;look for the terminating null
JNE FILENAME7 ;error if not found
DEC DI ;adjust DI to point to last
DEC DI ;character
NOT CX ;get length in CX
DEC CX ;adjust the length
XOR AX,AX ;clear ax again
PUSH CX ;save CX temporarily
STD ;reverse the direction
MOV AL,"\" ;path seperator
REPNE SCASB ;look for the \
JNE FILENAME1 ;no \ found
INC DI ;adjust DI
INC DI
POP AX ;get search length in AX
SUB AX,CX ;back out CX
MOV CX,AX ;get length in CX
DEC CX ;adjust the length
JMP SHORT FILENAME9 ;go return
FILENAME1: INC DI ;adjust DI
POP CX ;get search length in CX
CMP CX,12D ;longer than 12 bytes?
JLE FILENAME9 ;no, ok
FILENAME7: STC ;set carry to indicate error
FILENAME9: CLD ;set direction forward
POP AX ;restore AX
RET ;return to caller
FILENAME ENDP
;----------------------------------------------------------------------
; BTOA - Unsigned binary to ascii conversion.
; Entry: DX:AX contains value to convert. ES:DI addresses the output
; buffer. BX contains radix (eg. 10d is decimal, 16d is hexadecimal).
; CX contains the size of the output buffer in bytes.
; Exit: ES:DI address the result. CX contains length in bytes.
;----------------------------------------------------------------------
BTOA PROC NEAR ;unsigned binary to ascii conv
ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING
PUSH DX ;save DX
PUSH AX ;and AX
PUSH AX ;save AX for as moment
MOV AL," " ;first blank fill
REP STOSB ;the buffer
POP AX ;get back AX
DEC DI ;start at the last position
PUSH DI ;save start address
BTOA0010: MOV CX,DX ;get high in cx
OR CX,AX ;is value zero?
JZ BTOA9900 ;yes, jump out
BTOA0020: PUSH AX ;save ax
MOV AX,DX
XOR DX,DX ;0:div-high/divisor
DIV BX
MOV CX,AX ;save quotient in cx
POP AX ;restore ax
DIV BX ;remainder:div-low/divisor
XCHG CX,DX ;get first quotient in dx
;dx:ax=quotient, cx=remainder
ADD CL,"0" ;make ascii
CMP CL,"9" ;greater than 9 needs hex
JBE BTOA1000 ;no, less than 9
ADD CL,'A'-'9'-1 ;map to uppercase hex
BTOA1000: MOV ES:[DI],CL ;store it
DEC DI ;decrement destination
MOV CX,DX ;get high in cx
OR CX,AX ;is value zero?
JZ BTOA9900 ;yes, jump out
JMP BTOA0020 ;loop
BTOA9900: POP CX ;original address
SUB CX,DI ;back out current address
INC DI ;point to start
POP AX ;restore dx:ax
POP DX
RET
BTOA ENDP
;----------------------------------------------------------------------
; STRUPPER - Convert asciiz string to uppercase.
; Entry: DS:SI addresses the string. String must end with binary 0.
;----------------------------------------------------------------------
STRUPPER PROC NEAR ;uppercase asciiz string
ASSUME CS:CSEG,DS:CSEG,ES:NOTHING,SS:NOTHING
PUSH AX ;save ax
PUSH SI ;save di
STRUPPER1:
LODSB ;get char in al
OR AL,AL ;is it zero
JZ STRUPPER2 ;yes, we are finished
CMP AL,'a' ;less than 'a'
JB STRUPPER1 ;yes, skip it
CMP AL,'z' ;above 'z'
JA STRUPPER1 ;yes, skip it
AND AL,0DFH ;mask bit 5, make uppercase
MOV BYTE PTR DS:[SI-1],AL ;replace
JMP STRUPPER1 ;loop and get another
STRUPPER2:
POP SI ;restore di
POP AX ;restore ax
RET
STRUPPER ENDP
BUFFER LABEL BYTE ;Storage for i/o buffer
CSEG ENDS
END ENTRY
