Category : Pascal Source Code
Archive   : RLINE-OP.ZIP
Filename : READERS.PAS
{$M 16384,0,655360}
UNIT Readers;
(*******************************************************)
interface
(*******************************************************)
USES
DOS, Crt, moveops, RLine;
TYPE
ViewPtr = ^Reader;
Reader = Object(Scroller)
FO : FileOfLines;
CONSTRUCTOR Init(FN : String; FileBufSize : Word;
px1,py1,px2,py2 : integer);
DESTRUCTOR Done;
PROCEDURE Help; virtual;
FUNCTION DTAline(Row : LongInt) : String; virtual;
PROCEDURE GotoLine(X : LongInt); virtual;
PROCEDURE CheckRFerror;
PROCEDURE ShowStatus; virtual;
PROCEDURE Message(s : str80); virtual;
FUNCTION AskString(prompt : string) : string; virtual;
END;
(*******************************************************)
implementation
(*******************************************************)
CONSTRUCTOR Reader.Init(FN : string; FileBufSize : word;
px1,py1,px2,py2 : integer);
BEGIN
IF FO.Init(FN, FileBufSize)
THEN BEGIN
checkrferror;
Scroller.Init(px1,py1,px2,py2,FO.TotalLines)
END ELSE Fail;
END;
PROCEDURE Reader.CheckRFerror;
BEGIN
With FO Do BEGIN
if (RFerror <> 0) and (RFerror <> $FFFF) THEN BEGIN
Writeln(RFerrorString);
Halt(1);
END;
END;
END;
DESTRUCTOR Reader.Done;
BEGIN
FO.Done;
Scroller.Done;
END;
FUNCTION Reader.DTAline(Row : LongInt) : String;
CONST
Blanks : string[8] = ' ';
VAR
i : Integer;
BEGIN
With FO DO BEGIN
SeekLine(Row);
IF RFerror = 0 THEN BEGIN
i := pos(^I,LastLine); { Expand existing tabs }
while i > 0 do BEGIN
LastLine[i] := ' ';
Blanks[0] := chr(i mod 8);
if blanks[0] > #0
then blanks[0] := chr(8 - ord(blanks[0]));
insert(blanks, LastLine, i);
i := pos(^I,LastLine);
END;
DTAline := LastLine;
END ELSE BEGIN
DTAline := '';
RFerror := 0;
END;
END;
END;
PROCEDURE Reader.GotoLine(X : LongInt);
BEGIN
IF x <= TotalItems
THEN Scroller.GotoLine(x)
ELSE Message('Attempted to GotoLine past End Of File.');
END;
TYPE
Helper = object(Scroller)
FUNCTION DTAline(Row : Longint) : String; virtual;
END;
CONST
NHelpers = 17;
{$F+}
FUNCTION Helper.DTAline(Row : Longint) : String;
CONST
Hstrings : array[1..NHelpers] of String[32] =
(' F Find text',
' C Case-sensitive find',
' N Find next',
' A Auto-Scroll',
' 0..9 Adjust scroll speed',
'PgUp/PgDn Page up and down',
'Home Top of file',
'End Bottom of file',
'Up arrow Move up',
'Down arrow Move down',
'Right arrow Scroll right',
'Left arrow Scroll Left',
'Ctrl-Right Scroll 8 chars right',
'Ctrl-Left Go to first column',
'ESCape Exit to DOS',
'',
' Press ESCape now to return');
BEGIN
if Row <= NHelpers
THEN DTAline := Hstrings[Row]
ELSE DTAline := '';
END;
{$F-}
PROCEDURE Reader.Help;
var
H : Helper;
BEGIN
H.Init(x1,y1,x2,y2,NHelpers);
H.WrScr;
while H.scrollselect <> #27 do ;
H.Done;
wrscr;
END;
FUNCTION Reader.AskString(prompt : string) : string;
var
s : string[40];
BEGIN
AskString := '';
gotoxy(1,2);
clreol;
write(prompt, ' ');
readln(s);
AskString := s;
END;
PROCEDURE Reader.ShowStatus;
var i : integer;
BEGIN
gotoxy(1,1);
write(fo.filename, ' Line ',IxNoY1, ' of ', TotalItems, '. Col: ',FirstColumn);
clreol;
gotoxy(1,2);
write('> F1 for commands');
clreol;
END;
PROCEDURE Reader.Message(s : str80);
BEGIN
gotoxy(1,2);
write('> ', s);
clreol;
END;
END.
Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!
This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.
But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/