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breakSPort.p
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1988-11-18
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2KB
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77 lines
(*
breakSPort trueOrFalse -- Send or clear a break on the serial port.
To compile and link this file using Macintosh Programmer's Workshop,
pascal -w breakSPort.p
link -m ENTRYPOINT -o HyperCommands -rt XCMD=7030 -sn Main=breakSPort ∂
breakSPort.p.o "{MPW}"Libraries:interface.o
© Copyright 1987, 88 by Apple Computer, Inc.
Initial coding 9/87 by Harry R. Chesley.
*)
{$R-}
{$S breakSPort } { 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 breakSPort(paramPtr: XCmdPtr); forward;
procedure EntryPoint(paramPtr: XCmdPtr);
begin
breakSPort(paramPtr);
end;
procedure breakSPort(paramPtr: XCmdPtr);
var onOff: Str255;
doBreak: boolean;
{$I XCmdGlue.inc}
procedure Fail(errMsg: Str255); { set theResult and quit }
begin
paramPtr^.returnValue := PasToZero(errMsg);
exit(breakSPort);
end;
{$I SPortUtil.inc}
begin
if paramPtr^.paramCount <> 1 then Fail('parameter count is not 1');
SetUpSPortGlobals;
EnsureOpenPort;
GetStrParm(1,onOff); { First parameter is setting. }
doBreak := false;
if StringEqual(onOff,'true') or StringEqual(onOff,'on') then doBreak := true;
if doBreak then
begin
if SerSetBrk(ThisSPort.portOutDev) <> noErr then Fail('SerSetBrk failed');
end
else
begin
if SerClrBrk(ThisSPort.portOutDev) <> noErr then Fail('SerClrBrk failed');
end;
end;
end.