REM file: Ziplook.bas - Public Domain DOS Utility
REM Version 1.0a created 11/05/1997
REM Version 1.1a created 03/07/2001

REM Compiling instructions:
REM Compile Zipview.asm with
REM   Tasm -t zipview;
REM Since VB 1.00 forces Far Strings,
REM compile Ziplook.bas with PDS 7.10:
REM   \bc7\binb\bc.exe ziplook/x/o/g2;
REM   \bc7\binb\link.exe ziplook+zipview+keytrap,ziplook.exe,Nul,qbx.lib/e;

' declare subroutines
DECLARE SUB Directories(D$,F$)
DECLARE SUB Filenames(D$,F$)
DECLARE SUB DisplayFiles(D$,F$)
DECLARE SUB Display.String(V$)
DECLARE SUB Reset.Cursor()

' default integer variables
DEFINT A-Z
REM $DYNAMIC

' define boolean values
CONST True = -1
CONST False = NOT True
CONST TrueD = -1#
CONST FalseD = NOT TrueD
CONST NUL = ""

' define color values
CONST Black = 0
CONST Cyan = 11
CONST Green = 10
CONST Plain = 7
CONST Red = 12
CONST White = 15
CONST Yellow = 14

' get include files
REM $INCLUDE: 'qbx.bi'
REM $INCLUDE: 'dta.bi'
REM $INCLUDE: 'wdta.bi'

' initialize filename buffer
DIM ASCIIZ AS STRING * 260
COMMON SHARED Directory.ASCIIZ AS STRING * 260, ASCIIZ.Sub AS STRING * 260
COMMON SHARED Drive.Search AS STRING * 1, ASCIIZ.File AS STRING * 260
COMMON SHARED ASCIIZ.Display AS STRING * 260, ASCIIZ2.Display AS STRING * 260

' declare program dta
DIM BASIC.DTA.SEG AS INTEGER, BASIC.DTA.OFF AS INTEGER
COMMON SHARED TempDTA AS DTAtype, TempWDTA AS WDTAtype
COMMON SHARED TreeWDTA AS WDTAtype, FileWDTA AS WDTAtype

' declare registers
COMMON SHARED InregsX AS RegTypeX, OutregsX AS RegTypeX
COMMON SHARED InregsX2 AS RegTypeX, InregsX3 AS RegTypeX

' declare work variables
COMMON SHARED Files.Counter AS INTEGER, Quit.Searching AS INTEGER
COMMON SHARED Continuous.Display AS INTEGER, Files.Counted AS INTEGER
COMMON SHARED Video.Page AS INTEGER

' declare search work variables
COMMON SHARED Search.From.Date AS SINGLE, Search.To.Date AS SINGLE
COMMON SHARED Search.From.Time AS SINGLE, Search.To.Time AS SINGLE
COMMON SHARED File.Size AS DOUBLE, Recurse.Directories AS INTEGER
COMMON SHARED Display.Hidden AS INTEGER, Display.System AS INTEGER
COMMON SHARED Display.Readonly AS INTEGER, Display.Archive AS INTEGER
COMMON SHARED Display.Any AS INTEGER, No.Display.Archive AS INTEGER
COMMON SHARED No.Display.Readonly AS INTEGER, No.Display.System AS INTEGER
COMMON SHARED No.Display.Hidden AS INTEGER, No.Display.Any AS INTEGER
COMMON SHARED Short.Display AS INTEGER, Redirected.Input AS INTEGER
COMMON SHARED Display.Errors AS INTEGER

' declare file date\time and filesize work variables
COMMON SHARED File.Work.Date AS SINGLE, File.Work.Time AS SINGLE
COMMON SHARED Search.Size.From AS DOUBLE, Search.Size.To AS DOUBLE
COMMON SHARED Search.File.Size, Creation.Time AS INTEGER
COMMON SHARED Access.Time AS INTEGER, Modified.Time AS INTEGER

' declare file creation time seconds work variables
COMMON SHARED Half.Second1 AS SINGLE, Half.Second2 AS SINGLE
COMMON SHARED Millisecond AS INTEGER

' declare filename description variables
COMMON SHARED Continue AS INTEGER, File.Count AS INTEGER
COMMON SHARED Data.Error AS INTEGER, DescLength AS INTEGER
COMMON SHARED Description AS STRING, Lines.Counted AS INTEGER
COMMON SHARED WindowsHeader AS LONG, Dest.File$
COMMON SHARED CRLF$

' declare command line work variables
COMMON SHARED Command.Line AS STRING, Command.Line.Redirect AS STRING
COMMON SHARED Command.Work AS STRING, Control.Break AS INTEGER
COMMON SHARED Last.Switch AS INTEGER, Pipe.Buffer AS STRING * 1

' declare dos command work variables
COMMON SHARED Windows.Detected AS INTEGER

' declare functions
DECLARE FUNCTION ParseLine (S$)
DECLARE FUNCTION BreakIS()
DECLARE FUNCTION ClearBreak()
DECLARE FUNCTION KeyIS()

' declare external procedures
DECLARE SUB SetInt
DECLARE SUB RestInt

' backwards compatible for bc 7.1
REM $INCLUDE: 'bc7.inc'

' clears Control-Break flag
FUNCTION ClearBreak
 DEF SEG = &H40
 POKE &H71, &H0
 DEF SEG
 ClearBreak = True
END FUNCTION

' checks keyboard buffer
FUNCTION KeyIS
 InregsX3 = InregsX
 InregsX.AX = &H0100
 CALL InterruptX(&H16, InregsX, OutregsX)
 InregsX = InregsX3
 IF (OutregsX.Flags AND &H40) = &H40 THEN
    KeyIS = False
 ELSE
    KeyIS = True
 END IF
END FUNCTION

' checks Control-Break
FUNCTION BreakIS
 STATIC Var AS INTEGER
 IF Redirected.Input THEN
    DEF SEG = &H40
    X = PEEK(&H71)
    DEF SEG
    IF X = 64 THEN
       Var = True
    END IF
 END IF
 IF KeyIS THEN
    IF OutregsX.AX = 0 THEN
       Var = True
       DEF SEG = &H40
       POKE &H71, 64
       DEF SEG
    END IF
 END IF
 IF Var THEN
    Continuous.Display = True
 END IF
 BreakIS = Var
END FUNCTION

' command line parser
FUNCTION ParseLine (X$)
 Imbedded = INSTR(Command.Line, LCASE$(X$))
 IF Imbedded THEN
    Command.Line = LEFT$(Command.Line, Imbedded - 1) + MID$(Command.Line, Imbedded + LEN(X$))
    Last.Switch = Imbedded - 1
    ParseLine = True
 ELSE
    Imbedded = INSTR(Command.Line, UCASE$(X$))
    IF Imbedded THEN
       Command.Line = LEFT$(Command.Line, Imbedded - 1) + MID$(Command.Line, Imbedded + LEN(X$))
       Last.Switch = Imbedded - 1
       ParseLine = True
    ELSE
       ParseLine = False
    END IF
 END IF
END FUNCTION 

' install new interrupt service routine
CALL SetInt

' declare standard error trap
ON ERROR GOTO Error.Routine

' define carriage return/linefeed
CRLF$ = CHR$(13) + CHR$(10)

' store basic dta
InregsX.AX = &H2F00
CALL InterruptX(&H21, InregsX, OutregsX)
BASIC.DTA.SEG = OutregsX.ES
BASIC.DTA.OFF = OutregsX.BX

' get current drive
InregsX.AX = &H1900
CALL InterruptX(&H21, InregsX, OutregsX)
Current.Drive$ = CHR$((OutregsX.AX AND &HFF) + 65)

' check windows
Windows.Detected = True
If Load.Windows = False Then
   InregsX.AX = &H160A
   CALL InterruptX(&H2F, InregsX, OutregsX)
   IF OutregsX.AX > 0 THEN
      InregsX.AX = &H4A33
      CALL InterruptX(&H2F, InregsX, OutregsX)
      IF OutregsX.AX = 0 THEN
         Windows.Detected = 0 ' DOS 7.00
      END IF
   END IF
END IF
IF INSTR(COMMAND$, "/_") THEN
   Windows.Detected = True
END IF

' check windows dos
IF Windows.Detected THEN
   ' get current directory
   InregsX.AX = &H7147
   InregsX.DX = ASC(Current.Drive$) - 64
   InregsX.DS = VARSEG(Directory.ASCIIZ)
   InregsX.SI = VARPTR(Directory.ASCIIZ)
   CALL InterruptX(&H21, InregsX, OutregsX)
ELSE
   ' get current directory
   InregsX.AX = &H4700
   InregsX.DX = ASC(Current.Drive$) - 64
   InregsX.DS = VARSEG(Directory.ASCIIZ)
   InregsX.SI = VARPTR(Directory.ASCIIZ)
   CALL InterruptX(&H21, InregsX, OutregsX)
END IF

' display any errors
CALL DisplayError ("Error accessing drive.")

' store directory
Directory.ASCIIZ = "\" + RTRIM$(Directory.ASCIIZ) + CHR$(0)

' check command line
SELECT CASE COMMAND$
CASE "/?"
   GOTO Boot.Usage
END SELECT

' read command line from PSP
Command.Line = NUL
InregsX.AX = &H6200
CALL InterruptX(&H21, InregsX, OutregsX)
PSPsegment = OutregsX.BX
PSPoffset = 128
DEF SEG = PSPsegment
FOR Count = 1 TO 127
   Command.Char = PEEK(PSPoffset + Count)
   SELECT CASE Command.Char
   CASE 0, 10, 13
      EXIT FOR
   CASE ELSE
      Command.Line = Command.Line + CHR$(Command.Char)
   END SELECT
NEXT
DEF SEG
IF Command.Line = NUL THEN
   Command.Line = ENVIRON$("ZIPLOOK")
END IF
Command.Line = RTRIM$(Command.Line)

' check command line switches
Display.Archive = ParseLine ("//A")
Display.Hidden = ParseLine ("//H")
Display.Readonly = ParseLine ("//O")
Display.System = ParseLine ("//S")
Display.Any = ParseLine ("//X")
No.Display.Archive = ParseLine ("/A")
No.Display.Hidden = ParseLine ("/H")
No.Display.Readonly = ParseLine ("/O")
No.Display.System = ParseLine ("/S")
No.Display.Any = ParseLine ("/X")
Continuous.Display = ParseLine ("/C")
Short.Display = ParseLine ("/E")
Recurse.Directories = ParseLine ("/R")
Display.Errors = ParseLine ("/Z")
Control.Break = ParseLine ("/~")
Var = ParseLine("/_")

' reset file counter variable
Files.Counted = False
Continue = False
   
' get date\time from command line
Search.From.Date = False
Search.To.Date = False
Search.From.Time = False
Search.To.Time = False
Imbedded = INSTR(UCASE$(Command.Line), "/D")
IF Imbedded THEN
   Last.Switch = Imbedded - 1
   D$ = MID$(Command.Line, Imbedded + 2, 21)
   Command.Line = LEFT$(Command.Line, Imbedded - 1) + MID$(Command.Line, Imbedded + 23)
   IF LEN(D$) <> 21 THEN
      GOTO Boot.Error
   END IF
   IF MID$(D$, 11, 1) <> "-" THEN
      GOTO Boot.Error
   END IF
   S$ = LEFT$(D$, 10)
   D1! = INT(VAL(MID$(S$, 1, 2)))
   D2! = INT(VAL(MID$(S$, 4, 2)))
   D3! = INT(VAL(MID$(S$, 7, 4)))
   Search.From.Date = ((D3! - 1980) * 512) + D1! * 32 + D2!
   S$ = RIGHT$(D$, 10)
   D1! = INT(VAL(MID$(S$, 1, 2)))
   D2! = INT(VAL(MID$(S$, 4, 2)))
   D3! = INT(VAL(MID$(S$, 7, 4)))
   Search.To.Date = ((D3! - 1980) * 512) + D1! * 32 + D2!
   IF Search.From.Date < False OR Search.To.Date < False THEN
      GOTO Boot.Error
   END IF
END IF
Imbedded = INSTR(UCASE$(Command.Line), "/T")
IF Imbedded THEN
   Last.Switch = Imbedded - 1
   T$ = MID$(Command.Line, Imbedded + 2, 17)
   Command.Line = LEFT$(Command.Line, Imbedded - 1) + MID$(Command.Line, Imbedded + 19)
   IF LEN(T$) <> 17 THEN
      GOTO Boot.Error
   END IF
   IF MID$(T$, 9, 1) <> "-" THEN
      GOTO Boot.Error
   END IF
   S$ = LEFT$(T$, 8)
   T1! = INT(VAL(MID$(S$, 1, 2)))
   T2! = INT(VAL(MID$(S$, 4, 2)))
   T3! = INT(VAL(MID$(S$, 7, 2)))
   IF T3! / 2! <> INT(T3! / 2!) THEN
      Half.Second1 = .5!
   ELSE
      Half.Second1 = 0!
   END IF
   Search.From.Time = T1! * 2048 + T2! * 32 + INT(T3! / 2)
   S$ = RIGHT$(T$, 8)
   T1! = INT(VAL(MID$(S$, 1, 2)))
   T2! = INT(VAL(MID$(S$, 4, 2)))
   T3! = INT(VAL(MID$(S$, 7, 2)))
   IF T3! / 2! <> INT(T3! / 2!) THEN
      Half.Second2 = .5!
   ELSE
      Half.Second2 = 0!
   END IF
   Search.To.Time = T1! * 2048 + T2! * 32 + INT(T3! / 2)
   IF Search.From.Time < False OR Search.To.Time < False THEN
      GOTO Boot.Error
   END IF
END IF

' get file size from command line
Search.File.Size = False
Search.Size.From = FalseD
Search.Size.To = FalseD
Imbedded = INSTR(UCASE$(Command.Line), "/F")
IF Imbedded THEN
   Last.Switch = Imbedded - 1
   Search.File.Size = True
   Command.Line = LEFT$(Command.Line, Imbedded - 1) + MID$(Command.Line, Imbedded + 2)
   GOSUB Get.Numeric
   Search.Size.From = Var#
   IF MID$(Command.Line, Imbedded, 1) <> "-" THEN
      GOTO Boot.Error
   END IF
   Command.Line = LEFT$(Command.Line, Imbedded - 1) + MID$(Command.Line, Imbedded + 1)
   GOSUB Get.Numeric
   Search.Size.To = Var#
   Search.Size.From = Search.Size.From * 1024#
   Search.Size.To = Search.Size.To * 1024#
END IF

' get extended date\time switches
Creation.Time = ParseLine ("/1")
Access.Time = ParseLine ("/2")
Modified.Time = ParseLine ("/3")
IF Creation.Time = False THEN
   IF Access.Time = False THEN
      IF Modified.Time = False THEN
         Modified.Time = True
      END IF
   END IF
END IF

' add one-half second
IF Creation.Time THEN
   Search.From.Time = Search.From.Time + Half.Second1
   Search.To.Time = Search.To.Time + Half.Second2
END IF
Command.Line = RTRIM$(Command.Line)
IF Last.Switch THEN
   IF LEN(Command.Line) > Last.Switch THEN
      GOTO Boot.Error
   END IF
END IF

' get destination filename from command line
Dest.File$ = NUL
Imbedded = INSTR(UCASE$(Command.Line), "/B")
IF Imbedded THEN
   Dest.File$ = MID$(Command.Line, Imbedded + 2)
   IF LEFT$(Dest.File$, 1) = CHR$(34) THEN
      Dest.File$ = MID$(Dest.File$, 2)
   END IF
   IF RIGHT$(Dest.File$, 1) = CHR$(34) THEN
      Dest.File$ = LEFT$(Dest.File$, LEN(Dest.File$) - 1)
   END IF
   Command.Line = LEFT$(Command.Line, Imbedded - 1)
   Command.Line = RTRIM$(Command.Line)
END IF
Dest.File$ = RTRIM$(Dest.File$)
Dest.File$ = UCASE$(Dest.File$)

' recheck command line
IF INSTR(Command.Line, "/") THEN
   GOTO Boot.Error
END IF

' reset work variables
Files.Counter = False
Quit.Searching = False
   
' store video page
InregsX.AX = &HF00
CALL InterruptX(&H10, InregsX, OutregsX)
Video.Page = OutregsX.BX

' reposition cursor
LOCATE ,,1
CALL Reset.Cursor

' remove blanks from command line
Command.Line = RTRIM$(Command.Line)
Command.Line = LTRIM$(Command.Line)
Command.Line.Redirect = Command.Line

' check break flag override
IF Control.Break THEN
   Var = ClearBreak
END IF

' search through all input filenames
Redirected.Input = False

' check pipe length
InregsX.AX = &H4202 ' eof
InregsX.BX = 0 ' stdin
InregsX.CX = 0
InregsX.DX = 0
Call InterruptX(&H21, InregsX, OutregsX)
If OutregsX.AX > 0 Then
   Pipe.Redirect = True
   InregsX.AX = &H4200
   InregsX.BX = 0 ' stdin
   InregsX.CX = 0
   InregsX.DX = 0
   Call InterruptX(&H21, InregsX, OutregsX)
Endif
If Pipe.Redirect = False Then
   DEF SEG = &H40
   X = PEEK(&H71)
   DEF SEG
   IF X = 64 THEN
      DEF SEG = &H40
      POKE &H71, 0
      DEF SEG
   END IF
Endif
DO
   ' check control break
   IF BreakIS THEN
      EXIT DO
   END IF

   ' get standard input
   Standard.Input$ = NUL

   If Pipe.Redirect Then
      DO

         ' read from device
         InregsX.AX = &H3F00
         InregsX.BX = 0 ' stdin
         InregsX.CX = 1 ' char
         InregsX.DS = VARSEG(Pipe.Buffer)
         InregsX.DX = VARPTR(Pipe.Buffer)
         Call InterruptX(&H21, InregsX, OutregsX)
         If (OutregsX.Flags AND &H1) = &H1 Then
            Exit Do
         Endif
         If (OutregsX.Flags AND &H1) = &H0 Then
            If OutregsX.AX = 0 Then
               Exit Do
            Endif

            ' store input
            Redirected.Input = True

            ' store character
            Char$ = Pipe.Buffer

            ' check input character
            SELECT CASE ASC(Char$)
            CASE 10, 26
            CASE 13
               EXIT DO
            CASE ELSE
               Standard.Input$ = Standard.Input$ + Char$
            END SELECT
         END IF
      LOOP
   END IF

   ' clear break flag
   IF Redirected.Input = False THEN
      IF Cleared = False THEN
         Cleared = True
         Var = ClearBreak
      END IF
   END IF

   ' check control break
   IF BreakIS THEN
      EXIT DO
   END IF

   ' check nul filename input
   IF Redirected.Input = False THEN
      IF Standard.Input$ = NUL THEN
         CALL RestInt ' restore Control-Break
         X$ = Inkey$ ' quits here
         CALL SetInt ' reset Control-Break
         IF X$ = CHR$(0) + CHR$(0) THEN
            EXIT DO
         END IF
      END IF
   END IF

   ' check standard input
   IF Redirected.Input THEN
      IF Standard.Input$ = NUL THEN
	 EXIT DO
      END IF
   END IF

   ' display header
   GOSUB Header

   ' store original command line
   Command.Line = Command.Line.Redirect

   ' filename processing loop
   DO
      ' check control break
      IF BreakIS THEN
         EXIT DO
      END IF

      ' store redirected input
      Standard.Input$ = RTRIM$(Standard.Input$)
      Standard.Input$ = LTRIM$(Standard.Input$)
      IF LEFT$(Standard.Input$, 1) = CHR$(34) THEN
         Standard.Input$ = MID$(Standard.Input$, 2)
      END IF
      IF RIGHT$(Standard.Input$, 1) = CHR$(34) THEN
         Standard.Input$ = LEFT$(Standard.Input$, LEN(Standard.Input$) - 1)
      END IF

      ' store entire command
      IF LEFT$(Command.Line, 1) = CHR$(34) THEN
         Imbedded = INSTR(2, Command.Line, CHR$(34))
         IF Imbedded THEN
            Command.Work = Standard.Input$ + MID$(Command.Line, 2, Imbedded - 2)
            Command.Line = MID$(Command.Line, Imbedded + 1)
         ELSE
            Command.Work = Standard.Input$ + Command.Line
            Command.Line = NUL
         END IF
      ELSE
         Imbedded = INSTR(Command.Line, " ")
         IF Imbedded THEN
            Command.Work = Standard.Input$ + LEFT$(Command.Line, Imbedded - 1)
            Command.Line = MID$(Command.Line, Imbedded + 1)
         ELSE
            Command.Work = Standard.Input$ + Command.Line
            Command.Line = NUL
         END IF
      END IF
      Command.Line = LTRIM$(Command.Line)
      Command.Line = RTRIM$(Command.Line)

      ' store current drive
      IF MID$(Command.Work, 2, 1) = ":" THEN
         Drive.Search = LEFT$(Command.Work, 1)
         Command.Work = MID$(Command.Work, 3)
      ELSE
	 Drive.Search = Current.Drive$
      END IF
      Drive.Search = UCASE$(Drive.Search)

      ' check windows dos
      IF Windows.Detected THEN
         ' get current directory
         InregsX.AX = &H7147
         InregsX.DX = ASC(Drive.Search) - 64
         InregsX.DS = VARSEG(ASCIIZ)
         InregsX.SI = VARPTR(ASCIIZ)
         CALL InterruptX(&H21, InregsX, OutregsX)
      ELSE
         ' get current directory
         InregsX.AX = &H4700
         InregsX.DX = ASC(Drive.Search) - 64
         InregsX.DS = VARSEG(ASCIIZ)
         InregsX.SI = VARPTR(ASCIIZ)
         CALL InterruptX(&H21, InregsX, OutregsX)
      END IF

      ' display any errors
      CALL DisplayError ("Error accessing drive.")

      ' check find first error
      IF (OutregsX.Flags AND &H1) = &H0 THEN

         ' store current directory
         Directory.Search$ = "\" + LEFT$(ASCIIZ, INSTR(ASCIIZ, CHR$(0)) - 1)
         Imbedded1 = INSTR(Command.Work, "\")
         Imbedded2 = Imbedded1
         WHILE Imbedded1
            Imbedded2 = Imbedded1
            Imbedded1 = INSTR(Imbedded1 + 1, Command.Work, "\")
         WEND
         IF Imbedded2 THEN
            Directory.Search$ = LEFT$(Command.Work, Imbedded2)
            Command.Work = MID$(Command.Work, Imbedded2 + 1)
         END IF
         IF RIGHT$(Directory.Search$, 1) <> "\" THEN
            Directory.Search$ = Directory.Search$ + "\"
         END IF
   
         ' get filename spec
         Filename.Search$ = Command.Work
         IF Filename.Search$ = NUL THEN
            Filename.Search$ = "*.*"
         END IF
         Command.Work = NUL
   
         ' change to drive
         InregsX.AX = &HE00
         InregsX.DX = ASC(Drive.Search) - 65
         CALL InterruptX(&H21, InregsX, OutregsX)
   
         ' display any errors
         CALL DisplayError ("Error accessing drive.")

         ' check find first error
         IF (OutregsX.Flags AND &H1) = &H0 THEN

            ' display search filename
            IF Continuous.Display = False THEN
               IF LEFT$(Directory.Search$, 2) = "\\" THEN
                  Var$ = "Searching: " + Directory.Search$ + Filename.Search$ + CRLF$
               ELSE
                  Var$ = "Searching: " + Drive.Search + ":" + Directory.Search$ + Filename.Search$ + CRLF$
               END IF
               CALL Display.String(Var$)
               Files.Counter = Files.Counter + 1
            END IF

            ' call routine to search for files
            CALL Directories(Directory.Search$, Filename.Search$)

            ' restore current drive
            InregsX.AX = &HE00
            InregsX.DX = ASC(Current.Drive$) - 65
            CALL InterruptX(&H21, InregsX, OutregsX)

            ' check windows dos
            IF Windows.Detected THEN
               ' restore current directory
               InregsX.AX = &H713B
               InregsX.DS = VARSEG(Directory.ASCIIZ)
               InregsX.DX = VARPTR(Directory.ASCIIZ)
               CALL InterruptX(&H21, InregsX, OutregsX)
            ELSE
               ' restore current directory
               InregsX.AX = &H3B00
               InregsX.DS = VARSEG(Directory.ASCIIZ)
               InregsX.DX = VARPTR(Directory.ASCIIZ)
               CALL InterruptX(&H21, InregsX, OutregsX)
            END IF
         END IF
      END IF

      ' check search filename
      IF Command.Line = NUL THEN
	 EXIT DO
      END IF

      ' check quit searching
      IF Quit.Searching THEN
	 EXIT DO
      END IF
   LOOP

   ' check search filename
   IF Standard.Input$ = NUL THEN
      EXIT DO
   END IF

   ' check quit searching
   IF Quit.Searching THEN
      EXIT DO
   END IF
LOOP

End.Ziplook:

' restore basic dta
InregsX.AX = &H1A00
InregsX.DS = BASIC.DTA.SEG
InregsX.DX = BASIC.DTA.OFF
CALL InterruptX(&H21, InregsX, OutregsX)

' restore current drive
InregsX.AX = &HE00
InregsX.DX = ASC(Current.Drive$) - 65
CALL InterruptX(&H21, InregsX, OutregsX)

' check windows dos
IF Windows.Detected THEN
   ' restore current directory
   InregsX.AX = &H713B
   InregsX.DS = VARSEG(Directory.ASCIIZ)
   InregsX.DX = VARPTR(Directory.ASCIIZ)
   CALL InterruptX(&H21, InregsX, OutregsX)
ELSE
   ' restore current directory
   InregsX.AX = &H3B00
   InregsX.DS = VARSEG(Directory.ASCIIZ)
   InregsX.DX = VARPTR(Directory.ASCIIZ)
   CALL InterruptX(&H21, InregsX, OutregsX)
END IF

' display end program
IF Continuous.Display = False THEN
   Var$ = "Files counted" + STR$(Files.Counted) + CRLF$
   CALL Display.String(Var$)
   Prompt$ = "Press <enter> to exit to DOS:"
   CALL MorePrompt(Prompt$, CHR$(13), Outpt$)
END IF

' restore key trapping
CALL RestInt
COLOR Plain, Black
END

' display program usage
Boot.Usage:
 ' restore key trapping
 CALL RestInt
 Var$=Inkey$
 ' make header
 COLOR White, Black
 PRINT "Ziplook v1.1a: Zip file description utility; "
 COLOR Yellow, Black
 PRINT "Usage:"
 PRINT "   Ziplook <filelist>[/b<output file>][//ahosx][/cdefrtz]"
 PRINT "Where:"
 PRINT "   <filelist> is the list of zip files to display."
 PRINT "   /b  is the optional output filename"
 PRINT "   /c  continuous display   /e  short filename display"
 PRINT "   /r  recurse directories  /z  suppress error messages"
 PRINT "   display ranges: (/1  creation, /2  last access  /3  modify time)"
 PRINT "     /d  is range of file dates in form mm/dd/yyyy-mm/dd/yyyy"
 PRINT "     /t  is range of file times in form hh:mm:ss-hh:mm:ss"
 PRINT "     /f  is range of file sizes in form xxx-xxx in kilobytes"
 PRINT "   display file attributes:"
 PRINT "     // prefix for files with, / prefix for files without,"
 PRINT "       a  archive, h  hidden, o  read-only, s  system, x  none"
 COLOR Plain, Black
 END

Get.Numeric:
 Var# = False
 DO
    Temp$ = MID$(Command.Line, Imbedded, 1)
    IF Temp$ >= "0" AND Temp$ <= "9" THEN
       Var# = Var# * 10 + VAL(Temp$)
       Command.Line = LEFT$(Command.Line, Imbedded - 1) + MID$(Command.Line, Imbedded + 1)
    ELSE
       EXIT DO
    END IF
 LOOP
 RETURN

Boot.Error:
 CALL RestInt
 Var$=Inkey$
 COLOR White, Black
 PRINT "Command line error. Type Ziplook /? for help."
 COLOR Plain, Black
 END

' make header
Header:
 IF Header.Flag THEN
    RETURN
 END IF
 Header.Flag = True
 IF Continuous.Display = False THEN
    Var$ = "Ziplook v1.1a: Zip file description utility; " + CRLF$
    CALL Display.String(Var$)
 END IF
 RETURN   

' subroutine to access directories
SUB Directories (Directory.Search$, Filename.Search$)
 ' declare subroutine variables
 DIM Attribute AS INTEGER
 DIM DTAfile AS DTAtype
 DIM Wfile.Handle AS INTEGER

 ' make directory filename
 ASCIIZ.Sub = Directory.Search$ + "*.*" + CHR$(0)
 GOSUB Restore.DTA

 IF Windows.Detected THEN
    InregsX.AX = &H714E
    InregsX.CX = &H37
    InregsX.SI = &H1
    InregsX.DS = VARSEG(ASCIIZ.Sub)
    InregsX.DX = VARPTR(ASCIIZ.Sub)
    InregsX.ES = VARSEG(TreeWDTA)
    InregsX.DI = VARPTR(TreeWDTA)
    CALL InterruptX(&H21, InregsX, OutregsX)
    Wfile.Handle = OutregsX.AX
 ELSE
    InregsX.AX = &H4E00
    InregsX.CX = &H37
    InregsX.DS = VARSEG(ASCIIZ.Sub)
    InregsX.DX = VARPTR(ASCIIZ.Sub)
    CALL InterruptX(&H21, InregsX, OutregsX)
 END IF

 ' check find first error
 IF (OutregsX.Flags AND &H1) = &H1 THEN
    EXIT SUB
 END IF

 ' search directory names
 CALL Filenames(Directory.Search$, Filename.Search$)
 GOSUB Restore.DTA

 ' check to recurse directories
 IF Recurse.Directories THEN

    ' recurse directories
    DO
       ' check control-break
       IF BreakIS THEN
          Quit.Searching = True
       END IF

       ' check to quit
       IF Quit.Searching THEN
          EXIT DO
       END IF

       ' check directory attribute
       IF Windows.Detected THEN
          Attribute = ASC(TreeWDTA.FileBits)
       ELSE
          Attribute = ASC(DTAfile.FileBits)
       END IF

       ' check for directory
       IF (Attribute AND &H10) = &H10 THEN

          ' store directory name
          IF Windows.Detected THEN
             Directory$ = TreeWDTA.ASCIIZfull
          ELSE
             Directory$ = DTAfile.ASCIIZfilename
          END IF
          Directory$ = LEFT$(Directory$, INSTR(Directory$, CHR$(0)) - 1)

          ' check directory name
          IF Directory$ <> "." AND Directory$ <> ".." THEN

             ' make next search directory
             Next.Directory$ = Directory.Search$ + Directory$ + "\"

             ' recursively search subdirectories
             CALL Directories(Next.Directory$, Filename.Search$)

             ' restore dta
             GOSUB Restore.DTA
          END IF
       END IF

       ' check windows dos
       IF Windows.Detected THEN
          ' find next long filename
          InregsX.AX = &H714F
          InregsX.BX = Wfile.Handle
          InregsX.SI = &H1
          InregsX.ES = VARSEG(TreeWDTA)
          InregsX.DI = VARPTR(TreeWDTA)
          CALL InterruptX(&H21, InregsX, OutregsX)
       ELSE
          ' find next directory
          InregsX.AX = &H4F00
          CALL InterruptX(&H21, InregsX, OutregsX)
       END IF

       ' check findnext error
       IF (OutregsX.Flags AND &H1) = &H1 THEN
          EXIT DO
       END IF
    LOOP
 END IF
 ' check windows dos
 IF Windows.Detected THEN
    ' close long filename search
    InregsX.AX = &H71A1
    InregsX.BX = Wfile.Handle
    CALL InterruptX(&H21, InregsX, OutregsX)
 END IF
 EXIT SUB

Restore.DTA:
 ' restore directory search dta
 InregsX.AX = &H1A00
 InregsX.DS = VARSEG(DTAfile)
 InregsX.DX = VARPTR(DTAfile)
 CALL InterruptX(&H21, InregsX, OutregsX)
 RETURN
END SUB

' subroutine to access filenames in directory
SUB Filenames (Directory.Search$, Filename.Search$)
 ' declare subroutine variables
 DIM Attribute AS INTEGER
 DIM DTAfile AS DTAtype
 DIM Wfile.Handle AS INTEGER

 ' make filename
 ASCIIZ.File = Directory.Search$ + Filename.Search$ + CHR$(0)

 ' restore dta
 GOSUB Restore.FDTA

 ' check windows dos
 IF Windows.Detected THEN
    InregsX.AX = &H714E
    InregsX.CX = &H37
    InregsX.SI = &H1
    InregsX.DS = VARSEG(ASCIIZ.File)
    InregsX.DX = VARPTR(ASCIIZ.File)
    InregsX.ES = VARSEG(FileWDTA)
    InregsX.DI = VARPTR(FileWDTA)
    CALL InterruptX(&H21, InregsX, OutregsX)
    Wfile.Handle = OutregsX.AX
 ELSE
    InregsX.AX = &H4E00
    InregsX.CX = &H37
    InregsX.DS = VARSEG(ASCIIZ.File)
    InregsX.DX = VARPTR(ASCIIZ.File)
    CALL InterruptX(&H21, InregsX, OutregsX)
 END IF

 ' check find first error
 IF (OutregsX.Flags AND &H1) = &H1 THEN
    EXIT SUB
 END IF

 ' search filenames
 DO
    ' store filename
    IF Windows.Detected THEN
       Filename$ = FileWDTA.ASCIIZfull
    ELSE
       Filename$ = DTAfile.ASCIIZfilename
    END IF
    Filename$ = LEFT$(Filename$, INSTR(Filename$, CHR$(0)) - 1)

    ' check filename
    IF Filename$ <> "." AND Filename$ <> ".." THEN
       ' store file size
       IF Windows.Detected THEN
          File.Size = False
          File.Size = File.Size * &H100 + ASC(MID$(FileWDTA.FileSizeHigh, 4, 1))
          File.Size = File.Size * &H100 + ASC(MID$(FileWDTA.FileSizeHigh, 3, 1))
          File.Size = File.Size * &H100 + ASC(MID$(FileWDTA.FileSizeHigh, 2, 1))
          File.Size = File.Size * &H100 + ASC(MID$(FileWDTA.FileSizeHigh, 1, 1))
          File.Size = File.Size * &H100 + ASC(MID$(FileWDTA.FileSizeLow, 4, 1))
          File.Size = File.Size * &H100 + ASC(MID$(FileWDTA.FileSizeLow, 3, 1))
          File.Size = File.Size * &H100 + ASC(MID$(FileWDTA.FileSizeLow, 2, 1))
          File.Size = File.Size * &H100 + ASC(MID$(FileWDTA.FileSizeLow, 1, 1))
       ELSE
          File.Size = False
          File.Size = File.Size + ASC(MID$(DTAfile.FileSize, 4, 1))
          File.Size = File.Size * &H100 + ASC(MID$(DTAfile.FileSize, 3, 1))
          File.Size = File.Size * &H100 + ASC(MID$(DTAfile.FileSize, 2, 1))
          File.Size = File.Size * &H100 + ASC(MID$(DTAfile.FileSize, 1, 1))
       END IF

       ' display filename
       IF Windows.Detected THEN
          TempWDTA = FileWDTA
       ELSE
          TempDTA = DTAfile
       END IF
       CALL DisplayFiles(Directory.Search$, Filename$)

       ' restore dta
       GOSUB Restore.FDTA
    END IF

    ' check control-break
    IF BreakIS THEN
       Quit.Searching = True
    END IF

    ' check to quit
    IF Quit.Searching THEN
       EXIT DO
    END IF

    IF Windows.Detected THEN
       ' find next long filename
       InregsX.AX = &H714F
       InregsX.BX = Wfile.Handle
       InregsX.SI = &H1
       InregsX.ES = VARSEG(FileWDTA)
       InregsX.DI = VARPTR(FileWDTA)
       CALL InterruptX(&H21, InregsX, OutregsX)
    ELSE
       ' find next filename
       InregsX.AX = &H4F00
       CALL InterruptX(&H21, InregsX, OutregsX)
    END IF

    ' check find first error
    IF (OutregsX.Flags AND &H1) = &H1 THEN
       EXIT DO
    END IF
 LOOP

 ' check windows dos
 IF Windows.Detected THEN
    ' close long filename search
    InregsX.AX = &H71A1
    InregsX.BX = Wfile.Handle
    CALL InterruptX(&H21, InregsX, OutregsX)
 END IF
 EXIT SUB

Restore.FDTA:
 ' restore directory search dta
 InregsX.AX = &H1A00
 InregsX.DS = VARSEG(DTAfile)
 InregsX.DX = VARPTR(DTAfile)
 CALL InterruptX(&H21, InregsX, OutregsX)
 RETURN
END SUB

' subroutine to display a filename description
SUB DisplayFiles (Search.Directory$, Display.Filename$)
 ' declare subroutine variables
 DIM Attribute AS INTEGER

 ' make filename
 Search.Filename$ = Search.Directory$ + Display.Filename$
 ASCIIZ.Display = Search.Filename$ + CHR$(0)
 ASCIIZ2.Display = Search.Directory$ + CHR$(0)

 ' check windows dos
 IF Windows.Detected THEN
    ' get file attributes
    InregsX.AX = &H7143
    InregsX.BX = &H0
    InregsX.DS = VARSEG(ASCIIZ.Display)
    InregsX.DX = VARPTR(ASCIIZ.Display)
    CALL InterruptX(&H21, InregsX, OutregsX)
 ELSE
    ' get file attributes
    InregsX.AX = &H4300
    InregsX.DS = VARSEG(ASCIIZ.Display)
    InregsX.DX = VARPTR(ASCIIZ.Display)
    CALL InterruptX(&H21, InregsX, OutregsX)
 END IF

 ' display any errors
 Var = INSTR(ASCIIZ.Display, CHR$(0))
 Var$ = ASCIIZ.Display
 IF Var THEN
    Var$ = LEFT$(Var$, Var - 1)
 ELSE
    Var$ = ASCIIZ.Display
 END IF
 Var$ = RTRIM$(Var$)
 FOR Var = LEN(Var$) TO 1 STEP -1
    IF MID$(Var$, Var, 1) = "\" THEN
       Var$ = MID$(Var$, Var + 1)
       EXIT FOR
    END IF
 NEXT
 CALL DisplayError ("Error"+Str$(OutregsX.AX)+" reading filename attributes: "+Var$)

 ' store file attribute
 Attribute = OutregsX.CX

 ' check for readonly file
 IF (Attribute AND &H1) = &H1 THEN
    IF No.Display.Readonly THEN
       EXIT SUB
    END IF
 ELSE
    IF Display.Readonly THEN
       EXIT SUB
    END IF
 END IF

 ' check for hidden file
 IF (Attribute AND &H2) = &H2 THEN
    IF No.Display.Hidden THEN
       EXIT SUB
    END IF
 ELSE
    IF Display.Hidden THEN
       EXIT SUB
    END IF
 END IF

 ' check for system file
 IF (Attribute AND &H4) = &H4 THEN
    IF No.Display.System THEN
       EXIT SUB
    END IF
 ELSE
    IF Display.System THEN
       EXIT SUB
    END IF
 END IF

 ' check for archive file
 IF (Attribute AND &H20) = &H20 THEN
    IF No.Display.Archive THEN
       EXIT SUB
    END IF
 ELSE
    IF Display.Archive THEN
       EXIT SUB
    END IF
 END IF

 ' check all attributes
 IF Display.Any THEN
    IF (Attribute AND &H1) = &H1 THEN
       EXIT SUB
    END IF
    IF (Attribute AND &H2) = &H2 THEN
       EXIT SUB
    END IF
    IF (Attribute AND &H4) = &H4 THEN
       EXIT SUB
    END IF
    IF (Attribute AND &H20) = &H20 THEN
       EXIT SUB
    END IF
 END IF
 IF No.Display.Any THEN
    IF (Attribute AND &H1) = False THEN
       IF (Attribute AND &H2) = False THEN
          IF (Attribute AND &H4) = False THEN
             IF (Attribute AND &H20) = False THEN
                EXIT SUB
             END IF
          END IF
       END IF
    END IF
 END IF

 ' check file size
 IF Search.File.Size THEN
    IF Search.Size.From = FalseD AND Search.Size.To = FalseD THEN
       IF File.Size <> FalseD THEN
          EXIT SUB
       END IF
    ELSE
       IF Search.Size.From > FalseD OR Search.Size.To > FalseD THEN
          IF Search.Size.From > FalseD THEN
             IF Search.Size.To = FalseD THEN
                IF File.Size < Search.Size.From THEN
                   EXIT SUB
                END IF
             END IF
          END IF
          IF Search.Size.From = FalseD THEN
             IF Search.Size.To > FalseD THEN
                IF File.Size > Search.Size.To THEN
                   EXIT SUB
                END IF
             END IF
          END IF
          IF Search.Size.From <= Search.Size.To THEN
             IF File.Size < Search.Size.From OR File.Size > Search.Size.To THEN
                EXIT SUB
             END IF
          END IF
          IF Search.Size.From > Search.Size.To THEN
             IF File.Size < Search.Size.From AND File.Size > Search.Size.To THEN
                EXIT SUB
             END IF
          END IF
       END IF
    END IF
 END IF

 ' store file date and time
 Millisecond = 0
 IF Windows.Detected THEN
    IF Creation.Time THEN
       File.Work.Time = ASC(MID$(TempWDTA.CreateTime, 2, 1))
       File.Work.Time = File.Work.Time * &H100 + ASC(MID$(TempWDTA.CreateTime, 1, 1))
       File.Work.Date = ASC(MID$(TempWDTA.CreateTime, 4, 1))
       File.Work.Date = File.Work.Date * &H100 + ASC(MID$(TempWDTA.CreateTime, 3, 1))
       InregsX.AX = &H7143
       InregsX.BX = &H08
       InregsX.DS = VARSEG(ASCIIZ.Display)
       InregsX.DX = VARPTR(ASCIIZ.Display)
       CALL InterruptX(&H21, InregsX, OutregsX)
       Millisecond = OutregsX.SI
    ELSE
       IF Access.Time THEN
          File.Work.Time = ASC(MID$(TempWDTA.AccessTime, 2, 1))
          File.Work.Time = File.Work.Time * &H100 + ASC(MID$(TempWDTA.AccessTime, 1, 1))
          File.Work.Date = ASC(MID$(TempWDTA.AccessTime, 4, 1))
          File.Work.Date = File.Work.Date * &H100 + ASC(MID$(TempWDTA.AccessTime, 3, 1))
       ELSE
          IF Modified.Time THEN
             File.Work.Time = ASC(MID$(TempWDTA.ModTime, 2, 1))
             File.Work.Time = File.Work.Time * &H100 + ASC(MID$(TempWDTA.ModTime, 1, 1))
             File.Work.Time = File.Work.Time AND NOT(&H1F)
             File.Work.Date = ASC(MID$(TempWDTA.ModTime, 4, 1))
             File.Work.Date = File.Work.Date * &H100 + ASC(MID$(TempWDTA.ModTime, 3, 1))
          END IF
       END IF
    END IF
 ELSE
    File.Work.Time = ASC(MID$(TempDTA.FileTime, 2, 1))
    File.Work.Time = File.Work.Time * &H100 + ASC(MID$(TempDTA.FileTime, 1, 1))
    File.Work.Time = File.Work.Time AND NOT(&H1F)
    File.Work.Date = ASC(MID$(TempDTA.FileDate, 2, 1))
    File.Work.Date = File.Work.Date * &H100 + ASC(MID$(TempDTA.FileDate, 1, 1))
 END IF

 ' check date\time range
 IF Search.From.Date OR Search.To.Date THEN
    IF File.Work.Date < Search.From.Date THEN
       EXIT SUB
    END IF
    IF File.Work.Date > Search.To.Date THEN
       EXIT SUB
    END IF
 END IF
 IF Search.From.Time OR Search.To.Time THEN
    File.Work.Time = INT(File.Work.Time)
    IF Creation.Time THEN
       IF Millisecond >= 100 THEN
          File.Work.Time = File.Work.Time + .5!
       END IF
       IF File.Work.Time < Search.From.Time THEN
          EXIT SUB
       END IF
       IF File.Work.Time > Search.To.Time THEN
          EXIT SUB
       END IF
    END IF
    File.Work.Time = INT(File.Work.Time)
    IF Modified.Time THEN
       Search.From.Time2! = Search.From.Time AND NOT(&H1F)
       Search.To.Time2! = Search.To.Time AND NOT(&H1F)
       IF File.Work.Time < Search.From.Time2! THEN
          EXIT SUB
       END IF
       IF File.Work.Time > Search.To.Time2! THEN
          EXIT SUB
       END IF
    END IF
 END IF

 ' display zip file
 IF Continuous.Display = False THEN
    Outpt$ = Search.Filename$
    IF LEN(Dest.File$) THEN
       Outpt$ = Outpt$ + " - " + Dest.File$
    END IF
    Var$ = Outpt$ + CRLF$
    CALL Display.String(Var$)
 END IF

 ' check windows dos
 IF Windows.Detected THEN
    ' restore current directory
    InregsX.AX = &H713B
    InregsX.DS = VARSEG(ASCIIZ2.Display)
    InregsX.DX = VARPTR(ASCIIZ2.Display)
    CALL InterruptX(&H21, InregsX, OutregsX)
 ELSE
    ' restore current directory
    InregsX.AX = &H3B00
    InregsX.DS = VARSEG(ASCIIZ2.Display)
    InregsX.DX = VARPTR(ASCIIZ2.Display)
    CALL InterruptX(&H21, InregsX, OutregsX)
 END IF

 ' display zip file contents (files must be near strings)
 CALL ARCV(Dest.File$, Display.Filename$, ErrCode%)

 ' check windows dos
 IF Windows.Detected THEN
    ' restore current directory
    InregsX.AX = &H713B
    InregsX.DS = VARSEG(Directory.ASCIIZ)
    InregsX.DX = VARPTR(Directory.ASCIIZ)
    CALL InterruptX(&H21, InregsX, OutregsX)
 ELSE
    ' restore current directory
    InregsX.AX = &H3B00
    InregsX.DS = VARSEG(Directory.ASCIIZ)
    InregsX.DX = VARPTR(Directory.ASCIIZ)
    CALL InterruptX(&H21, InregsX, OutregsX)
 END IF

 ' finish display output
 IF Dest.File$ = NUL THEN
    Var$ = CRLF$
    CALL Display.String(Var$)
 END IF

 ' update files counter
 Files.Counted = Files.Counted + 1

 ' display prompt
 IF Continuous.Display = False AND Dest.File$ = NUL THEN
    Prompt$ = "Press Y for more, or Q to quit:"
    CALL MorePrompt(Prompt$, "yq", Outpt$)
    IF BreakIS THEN
       Outpt$ = "q"
    END IF
    IF Outpt$ = "q" THEN
       Quit.Searching = True
    END IF
 END IF
END SUB

' critical error trap
Error.Routine:
 Data.Error = ERR
 IF Display.Errors THEN
    Error.Level = True
    OutregsX.Flags = &H1
    RESUME NEXT
 END IF
 SELECT CASE Data.Error
 CASE 53
    Temp.Outpt$ = "File not found."
 CASE 57
    Temp.Outpt$ = "Media error."
 CASE 61
    Temp.Outpt$ = "Disk full."
 CASE 70
    Temp.Outpt$ = "Permission denied."
 CASE 71
    Temp.Outpt$ = "Disk not ready."
 CASE ELSE
    Temp.Outpt$ = "Untrapped error" + STR$(Data.Error) + "."
 END SELECT
 Var$ = Temp.Outpt$ + CRLF$
 CALL Display.String(Var$)
 Prompt$ = "Press R to retry, Q to quit, C to continue:"
 CALL MorePrompt(Prompt$, "rqc", Outpt$)
 IF BreakIS THEN
    Outpt$ = "q"
 END IF
 SELECT CASE Outpt$
 CASE "r"
    RESUME
 CASE "q"
    Error.Level = True
    RESUME End.Ziplook
 CASE "c"
    OutregsX.Flags = &H1
    RESUME NEXT
 END SELECT
 ' restore key trapping
 CALL RestInt
 COLOR Plain, Black
 END 0

SUB MorePrompt (Input.String$, Input.Mask$, Output.String$)
 Var$ = Input.String$ + " "
 CALL Display.String(Var$)
 Input.Char$ = NUL
 DO
    InregsX2 = InregsX
    DO
       IF BreakIS THEN
          EXIT DO
       END IF
       IF KeyIS THEN
          IF OutregsX.AX <> 0 THEN
             InregsX.AX = &H0000
             CALL InterruptX(&H16, InregsX, OutregsX)
             Input.Char$=CHR$(OutregsX.AX AND &HFF)
             EXIT DO
          END IF
       END IF
       ' release time slice.
       InregsX.AX = &H1680
       InregsX.BX = &H0000
       CALL InterruptX(&H2F, InregsX, OutregsX)
    LOOP
    InregsX = InregsX2
    IF BreakIS THEN
       EXIT DO
    END IF
    IF LEN(Input.Char$) THEN
       Input.Char$ = LCASE$(Input.Char$)
       IF INSTR(Input.Mask$, Input.Char$) THEN
          CALL Display.String(Input.Char$ + CRLF$)
	  Output.String$ = Input.Char$
	  EXIT DO
       END IF
    END IF
 LOOP
END SUB

' displays carry flag error
SUB DisplayError (Temp$)
 ' check carry flag error
 IF (OutregsX.Flags AND &H1) = &H1 THEN
    ' check display errors flag
    IF Display.Errors = False THEN
       ' display error
       Var$ = Temp$ + CRLF$
       CALL Display.String(Var$)
    END IF
 END IF
END SUB

' sends a string to standard output
SUB Display.String(Var$)
 CALL Reset.Cursor
 FOR Count = 1 TO LEN(Var$)
    InregsX.AX = &H0200
    InregsX.DX = ASC(MID$(Var$, Count, 1))
    CALL InterruptX(&H21, InregsX, OutregsX)
 NEXT
END SUB

' routine to position cursor
SUB Reset.Cursor
 InregsX.AX = &H0300
 InregsX.BX = Video.Page
 CALL InterruptX(&H10, InregsX, OutregsX)
 Cursor.Row = (OutregsX.DX And &HFF00) / 256 + 1
 Cursor.Column = (OutregsX.DX And &HFF) + 1
 LOCATE Cursor.Row, Cursor.Column, 1
END SUB
