{$R-}

(*
	openSPort portNumber -- Open the serial port driver.

	To compile and link this file using Macintosh Programmer's Workshop,

	pascal -w openPort.p
	link -m ENTRYPOINT -o HyperCommands -rt XCMD=0 -sn Main=openSPort openPort.p.o "{MPW}"Libraries:interface.o
	
*)

{$S openSPort } 	{ Segment name must be the same as the command name. }

unit DummyUnit;

interface

uses MemTypes, QuickDraw, OSIntf, HyperXCmd;

procedure EntryPoint(paramPtr: XCmdPtr);
	
implementation

type

Str31 = String[31];

procedure openSPort(paramPtr: XCmdPtr); forward;

procedure EntryPoint(paramPtr: XCmdPtr);

	begin
		openSPort(paramPtr);
	end;

procedure openSPort(paramPtr: XCmdPtr);

	var portNumber: integer;	
		inPort, outPort: integer;
		actualIn, actualOut: integer;
		i: integer;
		str: Str255;

	{$I XCmdGlue.inc}

	procedure Fail(errMsg: Str255); { set theResult and quit }
		begin
			paramPtr^.returnValue := PasToZero(errMsg);
			exit(openSPort);
		end;

	begin
		if paramPtr^.paramCount <> 1 then Fail('parameter count is not 1');

		ZeroToPas(paramPtr^.params[1]^,str);		{ First parameter is port number. }
		portNumber := StrToNum(str);
		if (portNumber < 1) or (portNumber > 2) then Fail('invalid port number');

		if portNumber = 1 then
			begin
				inPort := -6; outPort := -7;
			end
		else
			begin
				inPort := -8; outPort := -9;
			end;
		if (OpenDriver('.AOut',actualOut) <> noErr) or (OpenDriver('.AIn',actualIn) <> noErr) then
			Fail('OpenDriver failed');
		if (actualOut <> outPort) or (actualIn <> inPort) then Fail('openDriver failed');
	end;

end.
