Method PopState

src/GCodes/GCodeBuffer/GCodeBuffer.cpp:1035–1056

Pop state returning true if successful (i.e. no stack underrun)

// Pop state returning true if successful (i.e. no stack underrun)
bool GCodeBuffer::PopState(bool withinSameFile) noexcept
{
	bool poppedFileState;
	do
	{
		GCodeMachineState * const ms = machineState;
		if (ms->GetPrevious() == nullptr)
		{
			ms->messageAcknowledged = false;			// avoid getting stuck in a loop trying to pop
			ms->waitingForAcknowledgement = false;
			return false;
		}

		poppedFileState = !ms->localPush;
		machineState = ms->Pop();						// get the previous state and copy down any error message
		delete ms;
	} while (!withinSameFile && !poppedFileState);
	IF_NOT_BINARY(stringParser.ResetIndentationAfterPop());

	reprap.InputsUpdated();
	return true;
}

// Abort execution of any files or macros being executed
// We now avoid popping the state if we were not executing from a file, so that if DWC or PanelDue is used to jog the axes before they are homed, we don't report stack underflow.