/*
 * © Copyright 2003 Apple Computer, Inc. All rights reserved.
 *
 * IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc. (ÒAppleÓ) in 
 * consideration of your agreement to the following terms, and your use, installation, 
 * modification or redistribution of this Apple software constitutes acceptance of these
 * terms.  If you do not agree with these terms, please do not use, install, modify or 
 * redistribute this Apple software.
 *
 * In consideration of your agreement to abide by the following terms, and subject to these 
 * terms, Apple grants you a personal, non exclusive license, under AppleÕs copyrights in this 
 * original Apple software (the ÒApple SoftwareÓ), to use, reproduce, modify and redistribute 
 * the Apple Software, with or without modifications, in source and/or binary forms; provided 
 * that if you redistribute the Apple Software in its entirety and without modifications, you 
 * must retain this notice and the following text and disclaimers in all such redistributions 
 * of the Apple Software.  Neither the name, trademarks, service marks or logos of Apple 
 * Computer, Inc. may be used to endorse or promote products derived from the Apple Software 
 * without specific prior written permission from Apple. Except as expressly stated in this 
 * notice, no other rights or licenses, express or implied, are granted by Apple herein, 
 * including but not limited to any patent rights that may be infringed by your derivative 
 * works or by other works in which the Apple Software may be incorporated.
 * 
 * The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO WARRANTIES, 
 * EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON-
 * INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING THE APPLE 
 * SOFTWARE OR ITS USE AND OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS. 
 *
 * IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, 
 * REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND 
 * WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR 
 * OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
//	Includes
//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

#include <ctype.h>
#include <stdio.h>
#include <stdbool.h>
#include <sys/param.h>
#include <sys/time.h>
#include <mach/mach.h>
#include <mach/mach_error.h>
#include <mach/mach_init.h>
#include <IOKit/IOCFPlugIn.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/IOReturn.h>
#include <IOKit/storage/ata/IOATAStorageDefines.h>
#include <IOKit/storage/ata/ATASMARTLib.h>
#include <IOKit/storage/IOStorageDeviceCharacteristics.h>
#include <CoreFoundation/CoreFoundation.h>


//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
//	Macros
//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

#define DEBUG 0
#define DEBUG_ASSERT_COMPONENT_NAME_STRING "ATASMARTSample"
#define DEBUG_ASSERT_MESSAGE(componentNameString,	\
							 assertionString,		\
							 exceptionLabelString,	\
							 errorString,			\
							 fileName,				\
							 lineNumber,			\
							 errorCode)				\
DebugAssert(componentNameString,					\
					   assertionString,				\
					   exceptionLabelString,		\
					   errorString,					\
					   fileName,					\
					   lineNumber,					\
					   errorCode)					\

static void
DebugAssert ( const char *	componentNameString,
			  const char *	assertionString,
			  const char *	exceptionLabelString,
			  const char *	errorString,
			  const char *	fileName,
			  long			lineNumber,
			  int			errorCode )
{
	
	if ( ( assertionString != NULL ) && ( *assertionString != '\0' ) )
		printf ( "Assertion failed: %s: %s\n", componentNameString, assertionString );
	else
		printf ( "Check failed: %s:\n", componentNameString );
	if ( exceptionLabelString != NULL )
		printf ( "	 %s\n", exceptionLabelString );
	if ( errorString != NULL )
		printf ( "	 %s\n", errorString );
	if ( fileName != NULL )
		printf ( "	 file: %s\n", fileName );
	if ( lineNumber != 0 )
		printf ( "	 line: %ld\n", lineNumber );
	if ( errorCode != 0 )
		printf ( "	 error: %d\n", errorCode );
	
}

#include <AssertMacros.h>


//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
//	Constants
//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

#define kATADefaultSectorSize			512
#define kIOATABlockStorageDeviceClass	"IOATABlockStorageDevice"

enum
{
	kUnknown			= -1,
	kAllDevices 		= 0,
	kSpecificDevice 	= 1
};


//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
//	Prototypes
//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

static IOReturn
ValidateArguments ( int argc, const char * argv[], int * selector );

static void
PrintUsage ( void );

static IOReturn
PrintSMARTDataForAllDrives ( void );

static IOReturn
PrintSMARTDataForBSDNode ( const char * bsdNode );

static IOReturn
PrintSMARTDataForDevice ( io_object_t ataDevice );

static IOReturn
PrintSMARTData ( io_service_t service );

static CFStringRef
GetDriveDescription ( io_object_t service );


//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
//	¥	main - Our main entry point
//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

int
main ( int argc, const char * argv[] )
{
	
	int		result		= 0;
	int		selector	= 0;
	
	result = ValidateArguments ( argc, argv, &selector );
	require_noerr_action ( result, ErrorExit, PrintUsage ( ) );
	
	printf ( "\n" );
	
	switch ( selector )
	{
		
		case kAllDevices:
			result = PrintSMARTDataForAllDrives ( );
			require_action ( ( result == kIOReturnSuccess ), ErrorExit, result = -1 );
			break;
			
		case kSpecificDevice:
			result = PrintSMARTDataForBSDNode ( argv[argc - 1] );
			require_action ( ( result == kIOReturnSuccess ), ErrorExit, result = -1 );
			break;
			
		default:
			break;
			
	}
	
	
ErrorExit:
	
	
	return result;
	
}


//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
//	ValidateArguments - Validates arguments
//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

static IOReturn
ValidateArguments ( int argc, const char * argv[], int * selector )
{
	
	IOReturn	result = kIOReturnError;
	
	require ( ( argc > 1 ), ErrorExit );
	require ( ( argc < 4 ), ErrorExit );
	
	if ( argc == 2 )
	{
		
		require ( ( strcmp ( argv[1], "-a" ) == 0 ), ErrorExit );
		*selector = kAllDevices;
		
	}
	
	else if ( argc == 3 )
	{
		
		require ( ( strcmp ( argv[1], "-d" ) == 0 ), ErrorExit );
		*selector = kSpecificDevice;
		
	}
	
	result = kIOReturnSuccess;
	
	
ErrorExit:
	
	
	return result;
	
}


//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
//	PrintSMARTDataForAllDrives - Prints S.M.A.R.T. data for all ATA drives
//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

static IOReturn
PrintSMARTDataForAllDrives ( void )
{
	
	IOReturn		error 		= kIOReturnSuccess;
	io_iterator_t	iter		= MACH_PORT_NULL;
	io_object_t		ataDevice	= MACH_PORT_NULL;
	bool			foundOne	= false;
	
	error = IOServiceGetMatchingServices ( 	kIOMasterPortDefault,
											IOServiceMatching ( kIOATABlockStorageDeviceClass ),
											&iter );
	
	if ( error == kIOReturnSuccess )
	{
		
		ataDevice = IOIteratorNext ( iter );
		
		while ( ataDevice != MACH_PORT_NULL )
		{
			
			error = PrintSMARTDataForDevice ( ataDevice );
			IOObjectRelease ( ataDevice );
			ataDevice = IOIteratorNext ( iter );
			
			if ( foundOne == false )
				foundOne = true;
			
		}
		
		IOObjectRelease ( iter );
		iter = NULL;
		
	}
	
	if ( foundOne == false )
	{
		
		printf ( "No ATA devices found\n" );
		
	}
	
	return error;
	
}


//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
//	PrintSMARTDataForDevice - Prints S.M.A.R.T. data for an ATA device
//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

static IOReturn
PrintSMARTDataForDevice ( io_object_t ataDevice )
{
	
	CFMutableDictionaryRef	dict		= NULL;
	CFDictionaryRef			deviceDict	= NULL;
	CFNumberRef				features	= NULL;
	UInt32					value		= 0;
	IOReturn				err			= kIOReturnNoResources;
	Boolean					result		= false;				
	
	err = IORegistryEntryCreateCFProperties ( ataDevice,
											  &dict,
											  kCFAllocatorDefault,
											  kNilOptions );
	
	require ( ( err == kIOReturnSuccess ), ErrorExit );
	
	result = CFDictionaryGetValueIfPresent ( dict,
							CFSTR ( kIOPropertyDeviceCharacteristicsKey ),
							( const void ** ) &deviceDict );
							
	require_action ( result, ReleaseProperties, err = kIOReturnError );

	result = CFDictionaryGetValueIfPresent ( deviceDict,
							CFSTR ( "ATA Features" ),
							( const void ** ) &features );
	
	require_action ( result, ReleaseProperties, err = kIOReturnError );
	
	result = CFNumberGetValue ( features, kCFNumberLongType, &value );
	require_action ( result, ReleaseProperties, err = kIOReturnError );
	
	require_action ( ( value & kIOATAFeatureSMART ), ReleaseProperties, err = kIOReturnError );
	
	err = PrintSMARTData ( ataDevice );
	
	
ReleaseProperties:	
	
	
	require_quiet ( ( dict != NULL ), ErrorExit );
	CFRelease ( dict );
	dict = NULL;
	
	
ErrorExit:
	
	
	return err;
	
}


//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
//	PrintSMARTDataForBSDNode - Prints S.M.A.R.T data for a particular BSD Node
//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

static IOReturn
PrintSMARTDataForBSDNode ( const char * bsdNode )
{
	

	IOReturn		error	= kIOReturnError;
	io_object_t		object	= MACH_PORT_NULL;
	io_object_t		parent	= MACH_PORT_NULL;
	bool			found	= false;
	char *			bsdName = NULL;
	char 			deviceName[MAXPATHLEN];
	
	sprintf ( deviceName, "%s", bsdNode );
	
	if ( !strncmp ( deviceName, "/dev/r", 6 ) )
	{
		
		// Strip off the /dev/r from /dev/rdiskX
		bsdName = &deviceName[6];
		
	}
	
	else if ( !strncmp ( deviceName, "/dev/", 5 ) )
	{
		
		// Strip off the /dev/r from /dev/rdiskX
		bsdName = &deviceName[5];
		
	}
	
	else
	{
		
		bsdName = deviceName;
		
	}
	
	require_action ( ( strncmp ( bsdName, "disk", 4 ) == 0 ), ErrorExit, PrintUsage ( ) );
	
	object = IOServiceGetMatchingService ( 	kIOMasterPortDefault,
											IOBSDNameMatching ( kIOMasterPortDefault, 0, bsdName ) );

	require ( ( object != MACH_PORT_NULL ), ErrorExit );
	
	parent = object;
	while ( IOObjectConformsTo ( object, kIOATABlockStorageDeviceClass ) == false )
	{
		
		#if DEBUG
		
		io_name_t	className;
		
		error = IOObjectGetClass ( object, className );
		printf ( "Object class = %s\n", ( char * ) className );
		
		#endif
		
		error = IORegistryEntryGetParentEntry ( object, kIOServicePlane, &parent );
		require ( ( error == kIOReturnSuccess ), ReleaseObject );
		require ( ( parent != MACH_PORT_NULL ), ReleaseObject );
		
		IOObjectRelease ( object );
		object = parent;
		
	}
	
	if ( IOObjectConformsTo ( object, kIOATABlockStorageDeviceClass ) )
	{
		
		PrintSMARTDataForDevice ( object );
		found = true;
		
	}
	
	
ReleaseObject:
	
	
	require ( ( object != MACH_PORT_NULL ), ErrorExit );
	IOObjectRelease ( object );
	object = MACH_PORT_NULL;
	
	
ErrorExit:
	
	
	if ( found == false )
	{
		printf ( "No S.M.A.R.T. capable device at %s\n", bsdNode );
	}
	
	return error;
	
}


//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
//	PrintSMARTData - Prints S.M.A.R.T data
//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

IOReturn
PrintSMARTData ( io_service_t service )
{
	
	IOCFPlugInInterface	**		cfPlugInInterface 	= NULL;
	IOATASMARTInterface	**		smartInterface		= NULL;
	HRESULT						herr				= S_OK;
	IOReturn					err					= kIOReturnSuccess;
	SInt32						score				= 0;
	Boolean						conditionExceeded	= false;
	CFStringRef					description			= NULL;
	
	err = IOCreatePlugInInterfaceForService ( 	service,
												kIOATASMARTUserClientTypeID,
												kIOCFPlugInInterfaceID,
												&cfPlugInInterface,
												&score );
	
	require ( ( err == kIOReturnSuccess ), ErrorExit );
	
	herr = ( *cfPlugInInterface )->QueryInterface (
										cfPlugInInterface,
										CFUUIDGetUUIDBytes ( kIOATASMARTInterfaceID ),
										( LPVOID ) &smartInterface );
	
	require ( ( herr == S_OK ), ReleasePlugIn );
	
	
	require ( ( smartInterface != NULL ), ReleasePlugIn );
	
	err = ( *smartInterface )->SMARTEnableDisableOperations ( smartInterface, true );
	require ( ( err == kIOReturnSuccess ), ReleaseInterface );
	
	err = ( *smartInterface )->SMARTEnableDisableAutosave ( smartInterface, true );
	require ( ( err == kIOReturnSuccess ), ReleaseInterface );
	
	err = ( *smartInterface )->SMARTReturnStatus ( smartInterface, &conditionExceeded );
	require ( ( err == kIOReturnSuccess ), ReleaseInterface );
	
	description = GetDriveDescription ( service );
	printf ( "ATA Drive: " );
	fflush ( stdout );
	CFShow ( description );
	CFRelease ( description );
	
	if ( conditionExceeded )
	{
		printf ( "SMART condition exceeded, drive will fail soon\n" );
	}
	
	else
	{
		printf ( "SMART condition not exceeded, drive OK\n" );
	}
	
	
ReleaseInterface:	
	
	
	( *smartInterface )->Release ( smartInterface );
	smartInterface = NULL;
	
	
ReleasePlugIn:
	
	
	err = IODestroyPlugInInterface ( cfPlugInInterface );
	require ( ( err == kIOReturnSuccess ), ErrorExit );
	
	
ErrorExit:
	
	
	return err;
	
}


//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
//	¥	GetDriveDescription - Creates a drive description. Caller must call
//							  CFRelease on returned CFStringRef if non-NULL.
//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

static CFStringRef
GetDriveDescription ( io_object_t service )
{
	
	CFMutableStringRef		description = NULL;
	CFDictionaryRef			deviceDict	= NULL;
	CFStringRef				product		= NULL;
	CFMutableDictionaryRef	dict		= NULL;
	IOReturn				err			= kIOReturnSuccess;
	
	require ( ( service != MACH_PORT_NULL ), Exit );
	
	err = IORegistryEntryCreateCFProperties (	service,
												&dict,
												kCFAllocatorDefault,
												0 );					
	check ( err == kIOReturnSuccess );
	
	deviceDict = ( CFDictionaryRef ) CFDictionaryGetValue ( dict, CFSTR ( kIOPropertyDeviceCharacteristicsKey ) );
	require ( ( deviceDict != 0 ), Exit );
	
	product = ( CFStringRef ) CFDictionaryGetValue ( deviceDict, CFSTR ( kIOPropertyProductNameKey ) );
	
	description = CFStringCreateMutableCopy ( kCFAllocatorDefault, 0, product );
	require ( ( description != 0 ), Exit );
	
	
Exit:
	
	
	return description;
	
}


//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
//	¥	PrintUsage - Prints out usage
//ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

void
PrintUsage ( void )
{
	
	printf ( "\n" );
	printf ( "Usage: ATASMARTSample [-a] [-d label]\n" );
	printf ( "\t\t" );
	printf ( "-a Check S.M.A.R.T status for all available ATA devices\n" );
	printf ( "\t\t" );
	printf ( "-d Enter a specific bsd-style disk path to use" );
	printf ( "\t\t" );
	printf ( "e.g. /dev/disk0, /dev/rdisk2, disk3" );
	printf ( "\n" );
	
}