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bufferSPort.p
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1987-07-15
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88 lines
{$R-}
(*
bufferSPort(port number, oldBuffer,sizeOfBuffer) -- Free the old buffer at the address specified by
oldBuffer (if non-zero), and allocate a new buffer of sizeOfBuffer (or revert to default buffer if
zero). Return the address of the allocated buffer or zero if sizeOfBuffer is zero.
To compile and link this file using Macintosh Programmer's Workshop,
pascal -w bufferSPort.p
link -m ENTRYPOINT -o HyperCommands -rt XFCN=3 -sn Main=bufferSPort bufferSPort.p.o "{MPW}"Libraries:interface.o
*)
{$S bufferSPort } { Segment name must be the same as the command name. }
unit DummyUnit;
interface
uses MemTypes, QuickDraw, OSIntf, ToolIntf, HyperXCmd;
procedure EntryPoint(paramPtr: XCmdPtr);
implementation
const
return = chr(13);
linefeed = chr(10);
bs = chr(8);
type
Str31 = String[31];
procedure bufferSPort(paramPtr: XCmdPtr); forward;
procedure EntryPoint(paramPtr: XCmdPtr);
begin
bufferSPort(paramPtr);
end;
procedure bufferSPort(paramPtr: XCmdPtr);
var portNumber: integer;
oldBufferPtr: Ptr;
newBufferPtr: Ptr;
newBufferSize: longInt;
inPort, outPort: integer;
str: Str255;
{$I XCmdGlue.inc}
procedure Fail(errMsg: Str255); { set theResult and quit }
begin
paramPtr^.returnValue := PasToZero(errMsg);
exit(bufferSPort);
end;
begin
if paramPtr^.paramCount <> 3 then Fail('parameter count is not 3');
ZeroToPas(paramPtr^.params[1]^,str); { First parameter is port number. }
portNumber := StrToNum(str);
if (portNumber < 1) or (portNumber > 2) then Fail('invalid port number');
ZeroToPas(paramPtr^.params[2]^,str); { Second parameter is old buffer address. }
oldBufferPtr := Ptr(StrToNum(str));
ZeroToPas(paramPtr^.params[3]^,str); { Third parameter is new buffer size. }
newBufferSize := StrToNum(str);
if portNumber = 1 then inPort := -6
else inPort := -8;
if newBufferSize = 0 then newBufferPtr := nil
else newBufferPtr := NewPtr(newBufferSize);
if SerSetBuf(inPort,newBufferPtr,newBufferSize) <> noErr then
begin
DisposPtr(newBufferPtr);
Fail('SetSetBuf failed');
end;
if oldBufferPtr <> NIL then DisposPtr(oldBufferPtr);
str := LongToStr(ord4(newBufferPtr));
paramPtr^.returnValue := PasToZero(str);
end;
end.