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DESQVIEW.PAS
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Pascal/Delphi Source File
|
1991-07-21
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2KB
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108 lines
{$F+,O+,I-}
UNIT desqview;
INTERFACE
USES dos;
TYPE str2 = String[2];
VAR desqresult : Byte;
desqregs : Registers;
desqversion : Word;
FUNCTION DesqviewPresent:Boolean;
PROCEDURE StartTask(x: str2);
PROCEDURE GiveUpCPU;
PROCEDURE GiveUpIdle;
PROCEDURE ExitTask;
IMPLEMENTATION
FUNCTION DesqviewPresent;
BEGIN
desqresult:=0;
WITH desqregs DO BEGIN
ax:=$2b01;
bx:=0;
cx:=$4445;
dx:=$5351;
msdos(desqregs);
IF bx=2 THEN bx:=Swap(bx);
IF bx=0 THEN DesqviewPresent:=False ELSE DesqviewPresent:=True;
desqversion:=bx;
END;
END;
PROCEDURE StartTask;
VAR fn: pathstr;
pif : ARRAY[0..415] OF Byte;
f : FILE;
BEGIN
desqresult:=0;
IF (DesqviewPresent) AND (desqversion>=$200) THEN BEGIN
fn:=FSearch(x+'-PIF.DVP',GetEnv('PATH'));
IF fn='' THEN BEGIN
desqresult:=1;
Exit;
END;
Assign(f,fn);
Reset(f,1);
IF IoResult<>0 THEN BEGIN
desqresult:=2;
Exit;
END;
IF FileSize(f)<>416 THEN BEGIN
desqresult:=3;
Close(f);
Exit;
END;
BlockRead(f,pif,416);
IF IoResult<>0 THEN BEGIN
desqresult:=4;
Close(f);
Exit;
END;
Close(f);
WITH desqregs DO BEGIN
ds:=Seg(pif);
es:=Seg(pif);
di:=Ofs(pif);
bx:=$1a0;
ax:=$102c;
intr($15,desqregs);
IF bx=0 THEN BEGIN
desqresult:=6;
Exit;
END;
END;
END ELSE
desqresult:=5;
END;
PROCEDURE GiveUpCPU;
BEGIN
WITH desqregs DO BEGIN
ax:=$1000;
intr($15,desqregs);
END;
END;
PROCEDURE GiveUpIdle;
BEGIN
WITH desqregs DO BEGIN
ah:=1;
intr($16,desqregs);
IF (flags AND FZero) <> 0 THEN GiveUpCPU;
END;
END;
PROCEDURE ExitTask;
BEGIN
IF DesqviewPresent THEN intr($19,desqregs);
desqresult:=1;
END;
END.