llvm-project/lldb/tools/lldb-mi/MIDriver.cpp

//===-- MIDriver.cpp --------------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

//++
// File:		MIDriver.cpp
//
// Overview:	CMIDriver implementation.
//
// Environment:	Compilers:	Visual C++ 12.
//							gcc (Ubuntu/Linaro 4.8.1-10ubuntu9) 4.8.1
//				Libraries:	See MIReadmetxt. 
//
// Copyright:	None.
//--

// Third party headers:
#include <stdarg.h>		// va_list, va_start, var_end
#include <lldb/API/SBError.h>

// In-house headers:
#include "Driver.h"
#include "MIDriver.h"
#include "MICmnResources.h"
#include "MICmnLog.h"
#include "MICmdMgr.h"
#include "MICmnLLDBDebugger.h"
#include "MICmnMIResultRecord.h"
#include "MICmnMIValueConst.h"
#include "MICmnThreadMgrStd.h"
#include "MIUtilDebug.h"
#include "MIUtilSingletonHelper.h"
#include "MICmnStreamStdout.h"
#include "MICmnStreamStderr.h"

// Instantiations:
#if _DEBUG
	const CMIUtilString	CMIDriver::ms_constMIVersion = MIRSRC( IDS_MI_VERSION_DESCRIPTION_DEBUG );	
#else
	const CMIUtilString	CMIDriver::ms_constMIVersion = MIRSRC( IDS_MI_VERSION_DESCRIPTION );	// Matches version in resources file
#endif // _DEBUG
const CMIUtilString	CMIDriver::ms_constAppNameShort( MIRSRC( IDS_MI_APPNAME_SHORT ) );
const CMIUtilString	CMIDriver::ms_constAppNameLong( MIRSRC( IDS_MI_APPNAME_LONG ) );

//++ ------------------------------------------------------------------------------------
// Details:	CMIDriver constructor.
// Type:	Method.
// Args:	None.
// Return:	None.
// Throws:	None.
//--
CMIDriver::CMIDriver( void )
:	m_bFallThruToOtherDriverEnabled( false )
,	m_bDriverIsExiting( false )
,	m_handleMainThread( 0 )
,	m_rStdin( CMICmnStreamStdin::Instance() )
,	m_rLldbDebugger( CMICmnLLDBDebugger::Instance() )
,	m_rStdOut( CMICmnStreamStdout::Instance() )
{
}

//++ ------------------------------------------------------------------------------------
// Details:	CMIDriver destructor.
// Type:	Overridden.
// Args:	None.
// Return:	None.
// Throws:	None.
//--
CMIDriver::~CMIDriver( void )
{
}

//++ ------------------------------------------------------------------------------------
// Details:	Set whether *this driver (the parent) is enabled to pass a command to its 
//			fall through (child) driver to interpret the command and do work instead
//			(if *this driver decides it can't hanled the command).
// Type:	Method.
// Args:	vbYes	- (R) True = yes fall through, false = do not pass on command.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMIDriver::SetEnableFallThru( const bool vbYes )
{
	m_bFallThruToOtherDriverEnabled = vbYes;
	return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details:	Get whether *this driver (the parent) is enabled to pass a command to its 
//			fall through (child) driver to interpret the command and do work instead
//			(if *this driver decides it can't hanled the command).
// Type:	Method.
// Args:	None.
// Return:	bool - True = yes fall through, false = do not pass on command.
// Throws:	None.
//--
bool CMIDriver::GetEnableFallThru( void ) const
{
	return m_bFallThruToOtherDriverEnabled;
}

//++ ------------------------------------------------------------------------------------
// Details:	Retrieve MI's application name of itself.
// Type:	Method.
// Args:	None.
// Return:	CMIUtilString & - Text description.
// Throws:	None.
//--
const CMIUtilString & CMIDriver::GetAppNameShort( void ) const
{
	return ms_constAppNameShort;
}

//++ ------------------------------------------------------------------------------------
// Details:	Retrieve MI's application name of itself.
// Type:	Method.
// Args:	None.
// Return:	CMIUtilString & - Text description.
// Throws:	None.
//--
const CMIUtilString & CMIDriver::GetAppNameLong( void ) const
{
	return ms_constAppNameLong;
}

//++ ------------------------------------------------------------------------------------
// Details:	Retrieve MI's version description of itself.
// Type:	Method.
// Args:	None.
// Return:	CMIUtilString & - Text description.
// Throws:	None.
//--
const CMIUtilString & CMIDriver::GetVersionDescription( void ) const
{
	return ms_constMIVersion;
}

//++ ------------------------------------------------------------------------------------
// Details:	Initialize setup *this driver ready for use.
// Type:	Method.
// Args:	None.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMIDriver::Initialize( void )
{
	m_clientUsageRefCnt++;

	ClrErrorDescription();

	if( m_bInitialized )
		return MIstatus::success;

	bool bOk = MIstatus::success;
	CMIUtilString errMsg;

	// Initialize all of the modules we depend on
	MI::ModuleInit< CMICmnLog >         ( IDS_MI_INIT_ERR_LOG          , bOk, errMsg );
	MI::ModuleInit< CMICmnStreamStdout >( IDS_MI_INIT_ERR_STREAMSTDOUT , bOk, errMsg );
	MI::ModuleInit< CMICmnStreamStderr >( IDS_MI_INIT_ERR_STREAMSTDERR , bOk, errMsg );
	MI::ModuleInit< CMICmnResources >   ( IDS_MI_INIT_ERR_RESOURCES    , bOk, errMsg );
	MI::ModuleInit< CMICmnThreadMgrStd >( IDS_MI_INIT_ERR_THREADMANAGER, bOk, errMsg );
	MI::ModuleInit< CMICmnStreamStdin > ( IDS_MI_INIT_ERR_STREAMSTDIN  , bOk, errMsg );
	MI::ModuleInit< CMICmdMgr >         ( IDS_MI_INIT_ERR_CMDMGR       , bOk, errMsg );
	bOk &= m_rLldbDebugger.SetDriver( *this );
	MI::ModuleInit< CMICmnLLDBDebugger >( IDS_MI_INIT_ERR_LLDBDEBUGGER , bOk, errMsg );

#if MICONFIG_COMPILE_MIDRIVER_WITH_LLDBDRIVER
	CMIDriverMgr & rDrvMgr = CMIDriverMgr::Instance();
	bOk = bOk && rDrvMgr.RegisterDriver( *g_driver, "LLDB driver" );	// Will be pass thru driver
	if( bOk )
	{
		bOk = SetEnableFallThru( false ); // This is intentional at this time - yet to be fully implemented
		bOk = bOk && SetDriverToFallThruTo( *g_driver );
		CMIUtilString strOtherDrvErrMsg;
		if( bOk && GetEnableFallThru() && !g_driver->MISetup( strOtherDrvErrMsg ) )
		{
			bOk = false;
			errMsg = CMIUtilString::Format( MIRSRC( IDS_MI_INIT_ERR_FALLTHRUDRIVER ), strOtherDrvErrMsg.c_str()  );
		}
	}
#endif // MICONFIG_COMPILE_MIDRIVER_WITH_LLDBDRIVER

	m_bExitApp     = false;
	m_bInitialized = bOk;
	
	if( !bOk )
	{
		const CMIUtilString msg = CMIUtilString::Format( MIRSRC( IDS_MI_INIT_ERR_DRIVER ), errMsg.c_str() );
		SetErrorDescription( msg );
		return MIstatus::failure;
	}

	return bOk;
}

//++ ------------------------------------------------------------------------------------
// Details:	Unbind detach or release resources used by *this driver.
// Type:	Method.
// Args:	None.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMIDriver::Shutdown( void )
{
	if( --m_clientUsageRefCnt > 0 )
		return MIstatus::success;
	
	if( !m_bInitialized )
		return MIstatus::success;

	ClrErrorDescription();

	bool bOk = MIstatus::success;
	CMIUtilString errMsg;

	// Shutdown all of the modules we depend on
	MI::ModuleShutdown< CMICmnLLDBDebugger >( IDS_MI_INIT_ERR_LLDBDEBUGGER , bOk, errMsg );
	MI::ModuleShutdown< CMICmdMgr >         ( IDS_MI_INIT_ERR_CMDMGR       , bOk, errMsg );
	MI::ModuleShutdown< CMICmnStreamStdin > ( IDS_MI_INIT_ERR_STREAMSTDIN  , bOk, errMsg );
	MI::ModuleShutdown< CMICmnThreadMgrStd >( IDS_MI_INIT_ERR_THREADMANAGER, bOk, errMsg );
	MI::ModuleShutdown< CMICmnResources >   ( IDS_MI_INIT_ERR_RESOURCES    , bOk, errMsg );
	MI::ModuleShutdown< CMICmnStreamStderr >( IDS_MI_INIT_ERR_STREAMSTDERR , bOk, errMsg );
	MI::ModuleShutdown< CMICmnStreamStdout >( IDS_MI_INIT_ERR_STREAMSTDOUT , bOk, errMsg );
	MI::ModuleShutdown< CMICmnLog >         ( IDS_MI_INIT_ERR_LOG          , bOk, errMsg );
																					 
	if( !bOk )
	{
		SetErrorDescriptionn( MIRSRC( IDS_MI_SHUTDOWN_ERR ), errMsg.c_str() );
	}

	return bOk;
}

//++ ------------------------------------------------------------------------------------
// Details:	Work function. Client (the driver's user) is able to append their own message 
//			in to the MI's Log trace file.
// Type:	Method.
// Args:	vMessage		- (R) Client's text message.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMIDriver::WriteMessageToLog( const CMIUtilString & vMessage )
{
	CMIUtilString msg;
	msg = CMIUtilString::Format( MIRSRC( IDS_MI_CLIENT_MSG ), vMessage.c_str() );
	return m_pLog->Write( msg, CMICmnLog::eLogVerbosity_ClientMsg );
}

//++ ------------------------------------------------------------------------------------
// Details: CDriverMgr calls *this driver initialize setup ready for use.
// Type:	Overridden.
// Args:	None.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMIDriver::DoInitialize( void )
{
	return CMIDriver::Instance().Initialize();
}

//++ ------------------------------------------------------------------------------------
// Details:	CDriverMgr calls *this driver to unbind detach or release resources used by 
//			*this driver.
// Type:	Overridden.
// Args:	None.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMIDriver::DoShutdown( void )
{
	return CMIDriver::Instance().Shutdown();
}

//++ ------------------------------------------------------------------------------------
// Details:	Retrieve the name for *this driver.
// Type:	Overridden.
// Args:	None.
// Return:	CMIUtilString & - Driver name.
// Throws:	None.
//--
const CMIUtilString & CMIDriver::GetName( void ) const
{
	const CMIUtilString & rName = GetAppNameLong();
	const CMIUtilString & rVsn = GetVersionDescription();
	static CMIUtilString strName = CMIUtilString::Format( "%s %s", rName.c_str(), rVsn.c_str() );
	
	return strName;
}

//++ ------------------------------------------------------------------------------------
// Details:	Retrieve *this driver's last error condition.
// Type:	Overridden.
// Args:	None.
// Return:	CMIUtilString - Text description.
// Throws:	None.
//--
CMIUtilString CMIDriver::GetError( void ) const
{
	return GetErrorDescription();
}

//++ ------------------------------------------------------------------------------------
// Details:	Call *this driver to resize the console window.
// Type:	Overridden.
// Args:	vTermWidth	- (R) New window column size.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
void CMIDriver::DoResizeWindow( const uint32_t vTermWidth )
{
	GetTheDebugger().SetTerminalWidth( vTermWidth );
}

//++ ------------------------------------------------------------------------------------
// Details:	Call *this driver to return it's debugger.
// Type:	Overridden.
// Args:	None.
// Return:	lldb::SBDebugger & - LLDB debugger object reference.
// Throws:	None.
//--
lldb::SBDebugger & CMIDriver::GetTheDebugger( void )
{
	return m_rLldbDebugger.GetTheDebugger();
}

//++ ------------------------------------------------------------------------------------
// Details:	Specify another driver *this driver can call should this driver not be able 
//			to handle the client data input. DoFallThruToAnotherDriver() makes the call.
// Type:	Overridden.
// Args:	vrOtherDriver	- (R) Reference to another driver object.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMIDriver::SetDriverToFallThruTo( const CMIDriverBase & vrOtherDriver )
{
	m_pDriverFallThru = const_cast< CMIDriverBase * >( &vrOtherDriver );

	return m_pDriverFallThru->SetDriverParent( *this );
}

//++ ------------------------------------------------------------------------------------
// Details:	Proxy function CMIDriverMgr IDriver interface implementation. *this driver's
//			implementation called from here to match the existing function name of the 
//			original LLDb driver class (the extra indirection is not necessarily required).
//			Check the arguments that were passed to this program to make sure they are 
//			valid and to get their argument values (if any).
// Type:	Overridden.
// Args:	argc		- (R)	An integer that contains the count of arguments that follow in 
//								argv. The argc parameter is always greater than or equal to 1.
//			argv		- (R)	An array of null-terminated strings representing command-line 
//								arguments entered by the user of the program. By convention, 
//								argv[0] is the command with which the program is invoked.
//			vpStdOut	- (R)	Pointer to a standard output stream. 
//			vwbExiting	- (W)	True = *this want to exit, Reasons: help, invalid arg(s),
//								version information only.
//								False = Continue to work, start debugger i.e. Command 
//								interpreter. 
// Return:	lldb::SBError - LLDB current error status.
// Throws:	None.
//--
lldb::SBError CMIDriver::DoParseArgs( const int argc, const char * argv[], FILE * vpStdOut, bool & vwbExiting )
{
	return ParseArgs( argc, argv, vpStdOut, vwbExiting );
}

//++ ------------------------------------------------------------------------------------
// Details:	Check the arguments that were passed to this program to make sure they are 
//			valid and to get their argument values (if any).
// Type:	Overridden.
// Args:	argc		- (R)	An integer that contains the count of arguments that follow in 
//								argv. The argc parameter is always greater than or equal to 1.
//			argv		- (R)	An array of null-terminated strings representing command-line 
//								arguments entered by the user of the program. By convention, 
//								argv[0] is the command with which the program is invoked.
//			vpStdOut	- (R)	Pointer to a standard output stream. 
//			vwbExiting	- (W)	True = *this want to exit, Reasons: help, invalid arg(s),
//								version information only.
//								False = Continue to work, start debugger i.e. Command 
//								interpreter. 
// Return:	lldb::SBError - LLDB current error status.
// Throws:	None.
//--
lldb::SBError CMIDriver::ParseArgs( const int argc, const char * argv[], FILE * vpStdOut, bool & vwbExiting )
{
	lldb::SBError errStatus;

	// Do nothing - no options to handle for *this driver

	return errStatus;
}

//++ ------------------------------------------------------------------------------------
// Details:	A client can ask if *this driver is GDB/MI compatible.
// Type:	Overridden.
// Args:	None.
// Return:	True - GBD/MI compatible LLDB front end.
//			False - Not GBD/MI compatible LLDB front end.
// Throws:	None.
//--
bool CMIDriver::GetDriverIsGDBMICompatibleDriver( void ) const
{
	return true;
}

//++ ------------------------------------------------------------------------------------
// Details:	Callback function for monitoring stream stdin object. Part of the visitor 
//			pattern. 
//			This function is called by the CMICmnStreamStdin::CThreadStdin
//			"stdin monitor" thread (ID).
// Type:	Overridden.
// Args:	vStdInBuffer	- (R) Copy of the current stdin line data.
//			vrbYesExit		- (W) True = yes exit stdin monitoring, false = continue monitor.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMIDriver::ReadLine( const CMIUtilString & vStdInBuffer, bool & vrbYesExit )
{
	// For debugging. Update prompt show stdin is working
	//printf( "%s\n", vStdInBuffer.c_str() );
	//fflush( stdout );

	// Special case look for the quit command here so stop monitoring stdin stream
	// So we do not go back to fgetc() and wait and hang thread on exit
	if( vStdInBuffer == "quit" )
		vrbYesExit = true;

	// 1. Put new line in the queue container by stdin monitor thread
	// 2. Then *this driver ReadStdinLineQueuer() should when ready read the quence
	{
		CMIUtilThreadLock lock( m_threadMutex );
		m_queueStdinLine.push( vStdInBuffer );

		// Check to see if the *this driver is shutting down (exit application)
		if( !vrbYesExit )
			vrbYesExit = m_bDriverIsExiting;
	}
	
	return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details:	Start worker threads for the driver.
// Type:	Method.
// Args:	None.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMIDriver::StartWorkerThreads( void )
{
	bool bOk = MIstatus::success;
	
	// Grab the thread manager
	CMICmnThreadMgrStd & rThreadMgr = CMICmnThreadMgrStd::Instance();

	// Start the stdin thread
	bOk &= m_rStdin.SetVisitor( *this );
	if( bOk && !rThreadMgr.ThreadStart< CMICmnStreamStdin >( m_rStdin ))
	{
		const CMIUtilString errMsg = CMIUtilString::Format( MIRSRC( IDS_THREADMGR_ERR_THREAD_FAIL_CREATE ), CMICmnThreadMgrStd::Instance().GetErrorDescription().c_str() );
		SetErrorDescriptionn( errMsg );
		return MIstatus::failure;
	}

	// Start the event polling thread
	if( bOk && !rThreadMgr.ThreadStart< CMICmnLLDBDebugger >( m_rLldbDebugger ) )
	{
		const CMIUtilString errMsg = CMIUtilString::Format( MIRSRC( IDS_THREADMGR_ERR_THREAD_FAIL_CREATE ), CMICmnThreadMgrStd::Instance().GetErrorDescription().c_str() );
		SetErrorDescriptionn( errMsg );
		return MIstatus::failure;
	}

	return bOk;
}

//++ ------------------------------------------------------------------------------------
// Details:	Stop worker threads for the driver.
// Type:	Method.
// Args:	None.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMIDriver::StopWorkerThreads( void )
{
	CMICmnThreadMgrStd & rThreadMgr = CMICmnThreadMgrStd::Instance();
	return rThreadMgr.ThreadAllTerminate();
}

//++ ------------------------------------------------------------------------------------
// Details:	Call this function puts *this driver to work.
//			This function is used by the application's main thread.
// Type:	Overridden.
// Args:	None.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMIDriver::DoMainLoop( void )
{
	if( !StartWorkerThreads() )
		return MIstatus::failure;
	
	// App is not quitting currently
	m_bExitApp = false;

	// While the app is active
	while( !m_bExitApp )
	{
		// Poll stdin queue and dispatch
		if( !ReadStdinLineQueue() )
		{
			// Something went wrong
			break;
		}
	}

	// Signal that the application is shutting down
	DoAppQuit();

	// Close and wait for the workers to stop
	StopWorkerThreads();

	// Ensure that a new line is sent as the last act of the dying driver
	m_rStdOut.WriteMIResponse( "\n", false );

	return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details:	*this driver sits and waits for input to the stdin line queue shared by *this
//			driver and the stdin monitor thread, it queues, *this reads, interprets and
//			reacts.
//			This function is used by the application's main thread.
// Type:	Method.
// Args:	None.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMIDriver::ReadStdinLineQueue( void )
{
	// True when queue contains input
	bool bHaveInput = false;

	// Stores the current input line
	CMIUtilString lineText;
	{
		// Lock while we access the queue
		CMIUtilThreadLock lock( m_threadMutex );
		if( !m_queueStdinLine.empty() )
		{
			lineText = m_queueStdinLine.front();
			m_queueStdinLine.pop();
			bHaveInput = !lineText.empty();
		}
	}

	// Process while we have input
	if( bHaveInput )
	{
		if( lineText == "quit" )
		{
			// We want to be exiting when receiving a quit command
			m_bExitApp = true;
			return MIstatus::success;
		}

		// Process the command
		bool bCmdYesValid = false;
		bool bOk = InterpretCommand( lineText, bCmdYesValid );
		if( bOk && !bCmdYesValid )
			bOk = InterpretCommandFallThruDriver( lineText, bCmdYesValid );

		// Draw prompt if desired
		if( bOk && m_rStdin.GetEnablePrompt() )
			m_rStdOut.WriteMIResponse( m_rStdin.GetPrompt() );

		// Input has been processed
		bHaveInput = false;
	}
	else
	{
		// Give resources back to the OS
		const std::chrono::milliseconds time( 1 );
		std::this_thread::sleep_for( time );
	}
	
	return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details:	Set things in motion, set state etc that brings *this driver (and the 
//			application) to a tidy shutdown.
//			This function is used by the application's main thread.
// Type:	Method.
// Args:	None.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMIDriver::DoAppQuit( void )
{
	bool bYesQuit = true;

	// Shutdown stuff, ready app for exit
	{
		CMIUtilThreadLock lock( m_threadMutex );
		m_bDriverIsExiting = true;
	}

	return bYesQuit;
}

//++ ------------------------------------------------------------------------------------
// Details:	*this driver passes text commands to a fall through driver is it does not
//			understand them (the LLDB driver).
//			This function is used by the application's main thread.
// Type:	Method.
// Args:	vTextLine			- (R) Text data representing a possible command.
//			vwbCmdYesValid		- (W) True = Command valid, false = command not handled.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMIDriver::InterpretCommandFallThruDriver( const CMIUtilString & vTextLine, bool & vwbCmdYesValid )
{
	MIunused( vTextLine );
	MIunused( vwbCmdYesValid );

	// ToDo: Implement when less urgent work to be done
	//bool bOk = MIstatus::success;
	//bool bCmdNotUnderstood = true;
	//if( bCmdNotUnderstood && GetEnableFallThru() )
	//{
	//	CMIUtilString errMsg;
	//	bOk = DoFallThruToAnotherDriver( vStdInBuffer, errMsg );
	//	if( !bOk )
	//	{
	//		errMsg = errMsg.StripCREndOfLine();
	//		errMsg = errMsg.StripCRAll();
	//		const CMIDriverBase * pOtherDriver = GetDriverToFallThruTo();
	//		const MIchar * pName = pOtherDriver->GetDriverName().c_str();
	//		const MIchar * pId = pOtherDriver->GetDriverId().c_str();
	//		const CMIUtilString msg( CMIUtilString::Format( MIRSRC( IDS_DRIVER_ERR_FALLTHRU_DRIVER_ERR ), pName, pId, errMsg.c_str() ) );
	//		m_pLog->WriteMsg( msg );
	//	}
	//}
	//
	//vwbCmdYesValid = bOk;
	//CMIUtilString strNot;
	//if( vwbCmdYesValid)
	//	strNot = CMIUtilString::Format( "%s ", MIRSRC( IDS_WORD_NOT ) );
	//const CMIUtilString msg( CMIUtilString::Format( MIRSRC( IDS_FALLTHRU_DRIVER_CMD_RECEIVED ), vTextLine.c_str(), strNot.c_str() ) );
	//m_pLog->WriteLog( msg );
	
	return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details:	Retrieve the name for *this driver.
// Type:	Overridden.
// Args:	None.
// Return:	CMIUtilString & - Driver name.
// Throws:	None.
//--
const CMIUtilString & CMIDriver::GetDriverName( void ) const
{
	return GetName();
}

//++ ------------------------------------------------------------------------------------
// Details:	Get the unique ID for *this driver.
// Type:	Overridden.
// Args:	None.
// Return:	CMIUtilString & - Text description.
// Throws:	None.
//--
const CMIUtilString & CMIDriver::GetDriverId( void ) const
{
	return GetId();
}

//++ ------------------------------------------------------------------------------------
// Details:	This function allows *this driver to call on another driver to perform work
//			should this driver not be able to handle the client data input.
//			SetDriverToFallThruTo() specifies the fall through to driver.
//			Check the error message if the function returns a failure.
// Type:	Overridden.
// Args:	vCmd		- (R) Command instruction to interpret.
//			vwErrMsg	- (W) Error description on command failing.
// Return:	MIstatus::success - Command succeeded.
//			MIstatus::failure - Command failed.
// Throws:	None.
//--
bool CMIDriver::DoFallThruToAnotherDriver( const CMIUtilString & vCmd, CMIUtilString & vwErrMsg )
{
	bool bOk = MIstatus::success;

	CMIDriverBase * pOtherDriver = GetDriverToFallThruTo();
	if( pOtherDriver == nullptr )
		return bOk;

	return pOtherDriver->DoFallThruToAnotherDriver( vCmd, vwErrMsg );
}

//++ ------------------------------------------------------------------------------------
// Details:	*this driver provides a file stream to other drivers on which *this driver
//			write's out to and they read as expected input. *this driver is passing
//			through commands to the (child) pass through assigned driver.
// Type:	Overrdidden.
// Args:	None.
// Return:	FILE * - Pointer to stream.
// Throws:	None.
//--
FILE * CMIDriver::GetStdin( void ) const
{
	// Note this fn is called on CMIDriverMgr register driver so stream has to be
	// available before *this driver has been initialized! Flaw?

	// This very likely to change later to a stream that the pass thru driver
	// will read and we write to give it 'input'
	return stdin;
}

//++ ------------------------------------------------------------------------------------
// Details:	*this driver provides a file stream to other pass through assigned drivers 
//			so they know what to write to.
// Type:	Overidden.
// Args:	None.
// Return:	FILE * - Pointer to stream.
// Throws:	None.
//--
FILE * CMIDriver::GetStdout( void ) const
{
	// Note this fn is called on CMIDriverMgr register driver so stream has to be
	// available before *this driver has been initialized! Flaw?

	// Do not want to pass through driver to write to stdout
	return NULL;
}

//++ ------------------------------------------------------------------------------------
// Details:	*this driver provides a error file stream to other pass through assigned drivers 
//			so they know what to write to.
// Type:	Overidden.
// Args:	None.
// Return:	FILE * - Pointer to stream.
// Throws:	None.
//--
FILE * CMIDriver::GetStderr( void ) const
{
	// Note this fn is called on CMIDriverMgr register driver so stream has to be
	// available before *this driver has been initialized! Flaw?

	// This very likely to change later to a stream that the pass thru driver
	// will write to and *this driver reads from to pass on the the CMICmnLog object
	return stderr;
}

//++ ------------------------------------------------------------------------------------
// Details:	Set a unique ID for *this driver. It cannot be empty.
// Type:	Overridden.
// Args:	vId	- (R) Text description.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMIDriver::SetId( const CMIUtilString & vId )
{
	if( vId.empty() )
	{
		SetErrorDescriptionn( MIRSRC( IDS_DRIVER_ERR_ID_INVALID ), GetName().c_str(), vId.c_str() );
		return MIstatus::failure;
	}

	m_strDriverId = vId;
	return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details:	Get the unique ID for *this driver.
// Type:	Overridden.
// Args:	None.
// Return:	CMIUtilString & - Text description.
// Throws:	None.
//--
const CMIUtilString & CMIDriver::GetId( void ) const
{
	return m_strDriverId;
}

//++ ------------------------------------------------------------------------------------
// Details:	Interpret the text data and match against current commands to see if there 
//			is a match. If a match then the command is issued and actioned on. If a
//			command cannot be found to match then vwbCmdYesValid is set to false and
//			nothing else is done here.
//			This function is used by the application's main thread.
// Type:	Method.
// Args:	vTextLine			- (R) Text data representing a possible command.
//			vwbCmdYesValid		- (W) True = Command invalid, false = command acted on.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMIDriver::InterpretCommand( const CMIUtilString & vTextLine, bool & vwbCmdYesValid )
{
	vwbCmdYesValid = false;

	bool bCmdNotInCmdFactor = false;
	SMICmdData cmdData;
	CMICmdMgr & rCmdMgr = CMICmdMgr::Instance();
	if( !rCmdMgr.CmdInterpret( vTextLine, vwbCmdYesValid, bCmdNotInCmdFactor, cmdData ) )
		return MIstatus::failure;
	
	if( vwbCmdYesValid )
	{
		// For debugging only
		//m_pLog->WriteLog( cmdData.strMiCmdAll.c_str() );
		
		return ExecuteCommand( cmdData );
	}

	// Write to the Log that a 'command' was not valid. 
	// Report back to the MI client via MI result record.
	CMIUtilString strNotInCmdFactory;
	if( bCmdNotInCmdFactor )
		strNotInCmdFactory = CMIUtilString::Format( MIRSRC( IDS_DRIVER_CMD_NOT_IN_FACTORY ), cmdData.strMiCmd.c_str() );
	const CMIUtilString strNot( CMIUtilString::Format( "%s ", MIRSRC( IDS_WORD_NOT ) ) );
	const CMIUtilString msg( CMIUtilString::Format( MIRSRC( IDS_DRIVER_CMD_RECEIVED ), vTextLine.c_str(), strNot.c_str(), strNotInCmdFactory.c_str() ) );
	const CMICmnMIValueConst vconst = CMICmnMIValueConst( msg );
	const CMICmnMIValueResult valueResult( "msg", vconst );
	const CMICmnMIResultRecord miResultRecord( cmdData.nMiCmdNumber, CMICmnMIResultRecord::eResultClass_Error, valueResult );
	m_rStdOut.WriteMIResponse( miResultRecord.GetString() );
	
	// Proceed to wait for or execute next command
	return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details:	Having previously had the potential command validated and found valid now
//			get the command executed.
//			This function is used by the application's main thread.
// Type:	Method.
// Args:	vCmdData	- (RW) Command meta data.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMIDriver::ExecuteCommand( const SMICmdData & vCmdData )
{
	CMICmdMgr & rCmdMgr = CMICmdMgr::Instance();
	return rCmdMgr.CmdExecute( vCmdData );
}

//++ ------------------------------------------------------------------------------------
// Details:	Set the exit application flag. The application checks this flag after every
//			stdin line is read so the exit may not be instantious.
// Type:	Method.
// Args:	None.
// Return:	None.
// Throws:	None.
//--
void CMIDriver::SetExitApplicationFlag( void )
{
	CMIUtilThreadLock lock( m_threadMutex );
	m_bExitApp = true;
}