/*-------------------------------------------------------------------------
|   RXTX License v 2.1 - LGPL v 2.1 + Linking Over Controlled Interface.
|   RXTX is a native interface to serial ports in java.
|   Copyright 1998 Kevin Hester, kevinh@acm.org
|   Copyright 2000-2007 by Trent Jarvi tjarvi@qbang.org and others who
|   actually wrote it.  See individual source files for more information.
|
|   A copy of the LGPL v 2.1 may be found at
|   http://www.gnu.org/licenses/lgpl.txt on March 4th 2007.  A copy is
|   here for your convenience.
|
|   This library is free software; you can redistribute it and/or
|   modify it under the terms of the GNU Lesser General Public
|   License as published by the Free Software Foundation; either
|   version 2.1 of the License, or (at your option) any later version.
|
|   This library is distributed in the hope that it will be useful,
|   but WITHOUT ANY WARRANTY; without even the implied warranty of
|   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
|   Lesser General Public License for more details.
|
|   An executable that contains no derivative of any portion of RXTX, but
|   is designed to work with RXTX by being dynamically linked with it,
|   is considered a "work that uses the Library" subject to the terms and
|   conditions of the GNU Lesser General Public License.
|
|   The following has been added to the RXTX License to remove
|   any confusion about linking to RXTX.   We want to allow in part what
|   section 5, paragraph 2 of the LGPL does not permit in the special
|   case of linking over a controlled interface.  The intent is to add a
|   Java Specification Request or standards body defined interface in the 
|   future as another exception but one is not currently available.
|
|   http://www.fsf.org/licenses/gpl-faq.html#LinkingOverControlledInterface
|
|   As a special exception, the copyright holders of RXTX give you
|   permission to link RXTX with independent modules that communicate with
|   RXTX solely through the Sun Microsytems CommAPI interface version 2,
|   regardless of the license terms of these independent modules, and to copy
|   and distribute the resulting combined work under terms of your choice,
|   provided that every copy of the combined work is accompanied by a complete
|   copy of the source code of RXTX (the version of RXTX used to produce the
|   combined work), being distributed under the terms of the GNU Lesser General
|   Public License plus this exception.  An independent module is a
|   module which is not derived from or based on RXTX.
|
|   Note that people who make modified versions of RXTX are not obligated
|   to grant this special exception for their modified versions; it is
|   their choice whether to do so.  The GNU Lesser General Public License
|   gives permission to release a modified version without this exception; this
|   exception also makes it possible to release a modified version which
|   carries forward this exception.
|
|   You should have received a copy of the GNU Lesser General Public
|   License along with this library; if not, write to the Free
|   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
|   All trademarks belong to their respective owners.
--------------------------------------------------------------------------*/
/* Martin Pool <mbp@linuxcare.com> added support for explicitly-specified
 * lists of ports, October 2000. */
/* Joseph Goldstone <joseph@lp.com> reorganized to support registered ports,
 * known ports, and scanned ports, July 2001 */

package gnu.io;

import java.util.*;
import java.io.*;
import java.util.StringTokenizer;

/**
   This is the JavaComm for Linux driver.
*/
public class RXTXCommDriver implements CommDriver
{

	private final static boolean debug = false;
	private final static boolean devel = true;

	static
	{

		if(debug ) System.out.println("RXTXCommDriver {}");
/*
		System.loadLibrary( "rxtxSerial" );
*/

		/*
		   Perform a crude check to make sure people don't mix
		   versions of the Jar and native lib

		   Mixing the libs can create a nightmare.

		   It could be possible to move this over to RXTXVersion
		   but All we want to do is warn people when first loading
		   the Library.
		*/
		String JarVersion = RXTXVersion.getVersion();
		String LibVersion = nativeGetVersion();

		if ( devel )
		{
			System.out.println("Devel Library");
			System.out.println("=========================================");
			System.out.println("Native lib Version = " + JarVersion );
			System.out.println("Java lib Version   = " + LibVersion );
		}

/*  FIXME static not working
		if ( ! JarVersion.equals( LibVersion ) )
		{
			System.out.println( "WARNING:  RXTX Version mismatch\n\tJar version = " + JarVersion + "\n\tnative lib Version = " + LibVersion );
		}
		else if ( debug )
		{
			System.out.println( "RXTXCommDriver:\n\tJar version = " + JarVersion + "\n\tnative lib Version = " + LibVersion );
		}
*/
	}

	/** Get the Serial port prefixes for the running OS */
	private String deviceDirectory;
	private String osName;
	private static native String nativeGetVersion();
	private native boolean registerKnownPorts(int PortType);
	private native boolean isPortPrefixValid(String dev);
	private native boolean testRead(String dev, int type);
	private native String getDeviceDirectory();

	private final String[] getValidPortPrefixes(String CandidatePortPrefixes[])
	{
		/*
		256 is the number of prefixes ( COM, cua, ttyS, ...) not
		the number of devices (ttyS0, ttyS1, ttyS2, ...)

		On a Linux system there are about 400 prefixes in
		deviceDirectory.
		registerScannedPorts() assigns CandidatePortPrefixes to
		something less than 50 prefixes.

		Trent
		*/

		String ValidPortPrefixes[]=new String [256];
		if (debug)
			System.out.println("\nRXTXCommDriver:getValidPortPrefixes()");
		if(CandidatePortPrefixes==null)
		{
			if (debug)
				System.out.println("\nRXTXCommDriver:getValidPortPrefixes() No ports prefixes known for this System.\nPlease check the port prefixes listed for " + osName + " in RXTXCommDriver:registerScannedPorts()\n");
		}
		int i=0;
		for(int j=0;j<CandidatePortPrefixes.length;j++){
			if(isPortPrefixValid(CandidatePortPrefixes[j])) {
				ValidPortPrefixes[i++]=
					new String(CandidatePortPrefixes[j]);
			}
		}
		String[] returnArray=new String[i];
		System.arraycopy(ValidPortPrefixes, 0, returnArray, 0, i);
		if(ValidPortPrefixes[0]==null)
		{
			if (debug)
			{
				System.out.println("\nRXTXCommDriver:getValidPortPrefixes() No ports matched the list assumed for this\nSystem in the directory " + deviceDirectory + ".  Please check the ports listed for \"" + osName + "\" in\nRXTXCommDriver:registerScannedPorts()\nTried:");
				for(int j=0;j<CandidatePortPrefixes.length;j++){
					System.out.println("\t" +
						CandidatePortPrefixes[i]);
				}
			}
		}
		else
		{
			if (debug)
				System.out.println("\nRXTXCommDriver:getValidPortPrefixes()\nThe following port prefixes have been identified as valid on " + osName + ":\n");
/*
			for(int j=0;j<returnArray.length;j++)
			{
				if (debug)
					System.out.println("\t" + j + " " +
						returnArray[j]);
			}
*/
		}
		return returnArray;
	}

	/** handle solaris/sunos /dev/cua/a convention */
	private void checkSolaris(String PortName, int PortType)
	{
		char p[] =  { 91 };
		for( p[0] =97 ;p[0] < 123; p[0]++ )
		{
			if (testRead(PortName.concat(new String(p)),PortType))
			{
				CommPortIdentifier.addPortName(
					PortName.concat(new String(p)),
					PortType,
					this
				);
			}
		}
	}
	private void registerValidPorts(
		String CandidateDeviceNames[],
		String ValidPortPrefixes[],
		int PortType
	) {
		int i =0;
		int p =0 ;
		/* FIXME quick fix to get COM1-8 on windows working.  The
		   Read test is not working properly and its crunch time...
		if(osName.toLowerCase().indexOf("windows") != -1 )
		{
			for( i=0;i < CandidateDeviceNames.length;i++ )
			{
			CommPortIdentifier.addPortName( CandidateDeviceNames[i],
							PortType, this );
			}
			return;

		}
		*/
		if (debug)
		{
			System.out.println("Entering registerValidPorts()");
	/* */
			System.out.println(" Candidate devices:");
			for (int dn=0;dn<CandidateDeviceNames.length;dn++)
				System.out.println("  "	+
					CandidateDeviceNames[dn]);
			System.out.println(" valid port prefixes:");
			for (int pp=0;pp<ValidPortPrefixes.length;pp++)
				System.out.println("  "+ValidPortPrefixes[pp]);
	/* */
		}
		if ( CandidateDeviceNames!=null && ValidPortPrefixes!=null)
		{
			for( i = 0;i<CandidateDeviceNames.length; i++ ) {
				for( p = 0;p<ValidPortPrefixes.length; p++ ) {
					/* this determines:
					 * device file         Valid ports
					 * /dev/ttyR[0-9]*  != /dev/ttyS[0-9]*
					 * /dev/ttySI[0-9]* != /dev/ttyS[0-9]*
					 * /dev/ttyS[0-9]*  == /dev/ttyS[0-9]*

					 * Otherwise we check some ports
					 * multiple times.  Perl would rock
					 * here.
					 *
					 * If the above passes, we try to read
					 * from the port.  If there is no err
					 * the port is added.
					 * Trent
					 */
					String V =  ValidPortPrefixes[ p ];
					int VL = V.length();
					String C =   CandidateDeviceNames[ i ];
					if( C.length() < VL ) continue;
					String CU =
						C.substring(VL).toUpperCase();
					String Cl =
						C.substring(VL).toLowerCase();
					if( !( C.regionMatches(0, V, 0, VL ) &&
						CU.equals( Cl ) ) )
					{
						continue;
					}
					String PortName;
					if(osName.toLowerCase().indexOf("windows") == -1 )
					{
						PortName =
						new String(deviceDirectory +
							C );
					}
					else
					{
						PortName =
						new String( C );
					}
					if (debug)
					{
						System.out.println( C +
								" " + V );
						System.out.println( CU +
								" " + Cl );
					}
					if( osName.equals("Solaris") ||
						osName.equals("SunOS"))
						checkSolaris(PortName,PortType);
					else if (testRead(PortName, PortType))
					{
						CommPortIdentifier.addPortName(
								PortName,
								PortType,
								this
						);
					}
				}
			}
		}
		if (debug)
			System.out.println("Leaving registerValidPorts()");
	}


   /*
    * initialize() will be called by the CommPortIdentifier's static
    * initializer. The responsibility of this method is:
    * 1) Ensure that that the hardware is present.
    * 2) Load any required native libraries.
    * 3) Register the port names with the CommPortIdentifier.
	*
	* <p>From the NullDriver.java CommAPI sample.
	*
	* added printerport stuff
	* Holger Lehmann
	* July 12, 1999
	* IBM

	* Added ttyM for Moxa boards
	* Removed obsolete device cuaa
	* Peter Bennett
	* January 02, 2000
	* Bencom

    */

	/**
	*  Determine the OS and where the OS has the devices located
	*/
	public void initialize()
	{

		if (debug) System.out.println("RXTXCommDriver:initialize()");

		osName=System.getProperty("os.name");
		deviceDirectory=getDeviceDirectory();

	/*
	 First try to register ports specified in the properties
	 file.  If that doesn't exist, then scan for ports.
	*/
		for (int PortType=CommPortIdentifier.PORT_SERIAL;PortType<=CommPortIdentifier.PORT_PARALLEL;PortType++) {
			if (!registerSpecifiedPorts(PortType)) {
				if (!registerKnownPorts(PortType)) {
					registerScannedPorts(PortType);
				}
			}
		}
	}

	private void addSpecifiedPorts(String names, int PortType)
	{
		final String pathSep = System.getProperty("path.separator", ":");
		final StringTokenizer tok = new StringTokenizer(names, pathSep);

		if (debug)
			System.out.println("\nRXTXCommDriver:addSpecifiedPorts()");
		while (tok.hasMoreElements())
		{
			String PortName = tok.nextToken();

			if (testRead(PortName, PortType))
				CommPortIdentifier.addPortName(PortName,
					PortType, this);
		}
	}

   /*
    * Register ports specified in the file "gnu.io.rxtx.properties"
    * Key system properties:
    *                   gnu.io.rxtx.SerialPorts
    * 			gnu.io.rxtx.ParallelPorts
    *
    * Tested only with sun jdk1.3
    * The file gnu.io.rxtx.properties must reside in the java extension dir
    *
    * Example: /usr/local/java/jre/lib/ext/gnu.io.rxtx.properties
    *
    * The file contains the following key properties:
    *
    *  gnu.io.rxtx.SerialPorts=/dev/ttyS0:/dev/ttyS1:
    *  gnu.io.rxtx.ParallelPorts=/dev/lp0:
    *
    */
	private boolean registerSpecifiedPorts(int PortType)
	{
		String val = null;

		try
		    {

		     String ext_dir=System.getProperty("java.ext.dirs")+System.getProperty("file.separator");
		     FileInputStream rxtx_prop=new FileInputStream(ext_dir+"gnu.io.rxtx.properties");
		     Properties p=new Properties(System.getProperties());
		     p.load(rxtx_prop);
		     System.setProperties(p);
		    }catch(Exception e){
			if (debug){
			    System.out.println("The file: gnu.io.rxtx.properties doesn't exists.");
			    System.out.println(e.toString());
			    }//end if
			}//end catch

		if (debug)
			System.out.println("checking for system-known ports of type "+PortType);
		if (debug)
			System.out.println("checking registry for ports of type "+PortType);

		switch (PortType) {
			case CommPortIdentifier.PORT_SERIAL:
				if ((val = System.getProperty("gnu.io.rxtx.SerialPorts")) == null)
				val = System.getProperty("gnu.io.SerialPorts");
				break;

			case CommPortIdentifier.PORT_PARALLEL:
				if ((val = System.getProperty("gnu.io.rxtx.ParallelPorts")) == null)
				val = System.getProperty("gnu.io.ParallelPorts");
				break;
			default:
				if (debug)
				System.out.println("unknown port type "+PortType+" passed to RXTXCommDriver.registerSpecifiedPorts()");
		}

		if (val != null) {
			addSpecifiedPorts(val, PortType);
			return true;
		} else return false;
	}

   /*
    * Look for all entries in deviceDirectory, and if they look like they should
    * be serial ports on this OS and they can be opened then register
    * them.
    *
    */
	private void registerScannedPorts(int PortType)
	{
		String[] CandidateDeviceNames;
		if (debug)
			System.out.println("scanning device directory "+deviceDirectory+" for ports of type "+PortType);
		if(osName.equals("Windows CE"))
		{
			String[] temp =
			{ "COM1:", "COM2:","COM3:","COM4:",
			"COM5:", "COM6:", "COM7:", "COM8:" };
			CandidateDeviceNames=temp;
		}
		else if(osName.toLowerCase().indexOf("windows") != -1 )
		{
			/*
			{ "COM1:", "COM2:","COM3:","COM4:",
			"COM5:", "COM6:", "COM7:", "COM8:" };
			*/
			/* //./name is supposed to work for port numbers > 8 */
			/*
					{ "//./COM1", "//./COM2", "//./COM3",
					"//./COM4", "//./COM5", "//./COM6",
					"//./COM7", "//./COM8" };
			*/
			String[] temp =
			{
					"COM1", "COM2", "COM3",
					"COM4", "COM5", "COM6",
					"COM7", "COM8",
				/*
				   OK,  you asked for it The thread gods will
				   not like this.
				*/
					"COM9", "COM10", "COM11",
					"COM12", "COM13", "COM14",
					"COM15", "COM16",
				/*
				   Lets toss in LPT too!
				*/
					"LPT1", "LPT2", "LPT3" 
				};
	/*
				{ "COM1", "COM2","COM3","COM4",
				"COM5", "COM6", "COM7", "COM8" };
	*/
				CandidateDeviceNames=temp;
			}
			else if ( osName.equals("Solaris") || osName.equals("SunOS"))
			{
			/* Solaris uses a few different ways to identify ports.
			   They could be /dev/term/a /dev/term0 /dev/cua/a /dev/cuaa
			   the /dev/???/a appears to be on more systems.

			   The uucp lock files should not cause problems.
			*/
	/*
				File dev = new File( "/dev/term" );
				String deva[] = dev.list();
				dev = new File( "/dev/cua" );
				String devb[] = dev.list();
				String[] temp = new String[ deva.length + devb.length ];
				for(int j =0;j<deva.length;j++)
					deva[j] = "term/" + deva[j];
				for(int j =0;j<devb.length;j++)
					devb[j] = "cua/" + devb[j];
				System.arraycopy( deva, 0, temp, 0, deva.length );
				System.arraycopy( devb, 0, temp,
						deva.length, devb.length );
				if( debug ) {
					for( int j = 0; j< temp.length;j++)
						System.out.println( temp[j] );
				}
				CandidateDeviceNames=temp;
	*/

			/*

				ok..  Look the the dirctories representing the port
				kernel driver interface.

				If there are entries there are possibly ports we can
				use and need to enumerate.
			*/

				String term[] = new String[2];
				int l = 0;
				File dev = null;

				dev = new File( "/dev/term" );
				if( dev.list().length > 0 );
					term[l++] = new String( "term/" );
	/*
				dev = new File( "/dev/cua0" );
				if( dev.list().length > 0 );
					term[l++] = new String( "cua/" );
	*/
				String[] temp = new String[l];
				for(l--;l >= 0;l--)
					temp[l] = term[l];
				CandidateDeviceNames=temp;
			}
			else
			{
				File dev = new File( deviceDirectory );
				String[] temp = dev.list();
				CandidateDeviceNames=temp;
			}
			if (CandidateDeviceNames==null)
			{
				if (debug)
					System.out.println("RXTXCommDriver:registerScannedPorts() no Device files to check ");
				return;
			}

			String CandidatePortPrefixes[] = {};
			switch (PortType) {
				case CommPortIdentifier.PORT_SERIAL:
					if (debug)
						System.out.println("scanning for serial ports for os "+osName);
					if(osName.equals("Linux"))
					{
						String[] Temp = {
						"ttyS", // linux Serial Ports
						"ttySA" // for the IPAQs
						};
						CandidatePortPrefixes=Temp;
					}
					else if(osName.equals("Linux-all-ports"))
					{
					/* if you want to enumerate all ports ~5000
					   possible, then replace the above with this
					*/
						String[] Temp = {
						"comx",      // linux COMMX synchronous serial card
						"holter",    // custom card for heart monitoring
						"modem",     // linux symbolic link to modem.
						"ttyircomm", // linux IrCommdevices (IrDA serial emu)
						"ttycosa0c", // linux COSA/SRP synchronous serial card
						"ttycosa1c", // linux COSA/SRP synchronous serial card
						"ttyC", // linux cyclades cards
						"ttyCH",// linux Chase Research AT/PCI-Fast serial card
						"ttyD", // linux Digiboard serial card
						"ttyE", // linux Stallion serial card
						"ttyF", // linux Computone IntelliPort serial card
						"ttyH", // linux Chase serial card
						"ttyI", // linux virtual modems
						"ttyL", // linux SDL RISCom serial card
						"ttyM", // linux PAM Software's multimodem boards
							// linux ISI serial card
						"ttyMX",// linux Moxa Smart IO cards
						"ttyP", // linux Hayes ESP serial card
						"ttyR", // linux comtrol cards
							// linux Specialix RIO serial card
						"ttyS", // linux Serial Ports
						"ttySI",// linux SmartIO serial card
						"ttySR",// linux Specialix RIO serial card 257+
						"ttyT", // linux Technology Concepts serial card
						"ttyUSB",//linux USB serial converters
						"ttyV", // linux Comtrol VS-1000 serial controller
						"ttyW", // linux specialix cards
						"ttyX"  // linux SpecialX serial card
						};
						CandidatePortPrefixes=Temp;
					}
					else if(osName.toLowerCase().indexOf("qnx") != -1 )
					{
						String[] Temp = {
							"ser"
						};
						CandidatePortPrefixes=Temp;
					}
					else if(osName.equals("Irix"))
					{
						String[] Temp = {
							"ttyc", // irix raw character devices
							"ttyd", // irix basic serial ports
							"ttyf", // irix serial ports with hardware flow
							"ttym", // irix modems
							"ttyq", // irix pseudo ttys
							"tty4d",// irix RS422
							"tty4f",// irix RS422 with HSKo/HSki
							"midi", // irix serial midi
							"us"    // irix mapped interface
						};
						CandidatePortPrefixes=Temp;
					}
					else if(osName.equals("FreeBSD")) //FIXME this is probably wrong
					{
						String[] Temp = {
							"ttyd",    //general purpose serial ports
							"cuaa",    //dialout serial ports
							"ttyA",    //Specialix SI/XIO dialin ports
							"cuaA",    //Specialix SI/XIO dialout ports
							"ttyD",    //Digiboard - 16 dialin ports
							"cuaD",    //Digiboard - 16 dialout ports
							"ttyE",    //Stallion EasyIO (stl) dialin ports
							"cuaE",    //Stallion EasyIO (stl) dialout ports
							"ttyF",    //Stallion Brumby (stli) dialin ports
							"cuaF",    //Stallion Brumby (stli) dialout ports
							"ttyR",    //Rocketport dialin ports
							"cuaR",    //Rocketport dialout ports
							"stl"      //Stallion EasyIO board or Brumby N 
						};
						CandidatePortPrefixes=Temp;
					}
					else if(osName.equals("NetBSD")) // FIXME this is probably wrong
					{
						String[] Temp = {
							"tty0"  // netbsd serial ports
						};
						CandidatePortPrefixes=Temp;
					}
					else if ( osName.equals("Solaris")
							|| osName.equals("SunOS"))
					{
						String[] Temp = {
							"term/",
							"cua/"
						};
						CandidatePortPrefixes=Temp;
					}
					else if(osName.equals("HP-UX"))
					{
						String[] Temp = {
							"tty0p",// HP-UX serial ports
							"tty1p" // HP-UX serial ports
						};
						CandidatePortPrefixes=Temp;
					}

					else if(osName.equals("UnixWare") ||
							osName.equals("OpenUNIX"))
					{
						String[] Temp = {
							"tty00s", // UW7/OU8 serial ports
							"tty01s",
							"tty02s",
							"tty03s"
						};
						CandidatePortPrefixes=Temp;
					}

				else if	(osName.equals("OpenServer"))
					{
						String[] Temp = {
							"tty1A",  // OSR5 serial ports
							"tty2A",
							"tty3A",
							"tty4A",
							"tty5A",
							"tty6A",
							"tty7A",
							"tty8A",
							"tty9A",
							"tty10A",
							"tty11A",
							"tty12A",
							"tty13A",
							"tty14A",
							"tty15A",
							"tty16A",
							"ttyu1A", // OSR5 USB-serial ports
							"ttyu2A",
							"ttyu3A",
							"ttyu4A",
							"ttyu5A",
							"ttyu6A",
							"ttyu7A",
							"ttyu8A",
							"ttyu9A",
							"ttyu10A",
							"ttyu11A",
							"ttyu12A",
							"ttyu13A",
							"ttyu14A",
							"ttyu15A",
							"ttyu16A"
						};
						CandidatePortPrefixes=Temp;
					}
					else if (osName.equals("Compaq's Digital UNIX") || osName.equals("OSF1"))
					{
						String[] Temp = {
							"tty0"  //  Digital Unix serial ports
						};
						CandidatePortPrefixes=Temp;
					}

					else if(osName.equals("BeOS"))
					{
						String[] Temp = {
							"serial" // BeOS serial ports
						};
						CandidatePortPrefixes=Temp;
					}
					else if(osName.equals("Mac OS X"))
					{
						String[] Temp = {
						// Keyspan USA-28X adapter, USB port 1
							"cu.KeyUSA28X191.",
						// Keyspan USA-28X adapter, USB port 1
							"tty.KeyUSA28X191.",
						// Keyspan USA-28X adapter, USB port 2
							"cu.KeyUSA28X181.",
						// Keyspan USA-28X adapter, USB port 2
							"tty.KeyUSA28X181.",
						// Keyspan USA-19 adapter
							"cu.KeyUSA19181.",
						// Keyspan USA-19 adapter
							"tty.KeyUSA19181."
						};
						CandidatePortPrefixes=Temp;
					}
					else if(osName.toLowerCase().indexOf("windows") != -1 )
					{
						String[] Temp = {
							"COM"     // win32 serial ports
							//"//./COM"    // win32 serial ports
					};
					CandidatePortPrefixes=Temp;
				}
				else
				{
					if (debug)
						System.out.println("No valid prefixes for serial ports have been entered for "+osName + " in RXTXCommDriver.java.  This may just be a typo in the method registerScanPorts().");
				}
				break;

			case CommPortIdentifier.PORT_PARALLEL:
				if (debug)
					System.out.println("scanning for parallel ports for os "+osName);
			/** Get the Parallel port prefixes for the running os
			* Holger Lehmann
			* July 12, 1999
			* IBM
			*/
				if(osName.equals("Linux")
			/*
				|| osName.equals("NetBSD") FIXME
				|| osName.equals("HP-UX")  FIXME
				|| osName.equals("Irix")   FIXME
				|| osName.equals("BeOS")   FIXME
				|| osName.equals("Compaq's Digital UNIX")   FIXME
			*/
				)
				{
					String[] temp={
						"lp"    // linux printer port
					};
					CandidatePortPrefixes=temp;
				}
				else if(osName.equals("FreeBSD"))
				{
					String[] temp={
						"lpt"
					};
					CandidatePortPrefixes=temp;
				}
				else if(osName.toLowerCase().indexOf("windows") != -1 )
				{
					String[] temp={
						"LPT"
					};
					CandidatePortPrefixes=temp;
				}
				else  /* printer support is green */
				{
					String [] temp={};
					CandidatePortPrefixes=temp;
				}
				break;
			default:
				if (debug)
					System.out.println("Unknown PortType "+PortType+" passed to RXTXCommDriver.registerScannedPorts()");
		}
		registerValidPorts(CandidateDeviceNames, CandidatePortPrefixes, PortType);
	}


	/*
	 * <p>From the NullDriver.java CommAPI sample.
	 */
	/**
	*  @param PortName The name of the port the OS recognizes
	*  @param PortType CommPortIdentifier.PORT_SERIAL or PORT_PARALLEL
	*  @returns CommPort
	*  getCommPort() will be called by CommPortIdentifier from its
	*  openPort() method. PortName is a string that was registered earlier
	*  using the CommPortIdentifier.addPortName() method. getCommPort()
	*  returns an object that extends either SerialPort or ParallelPort.
	*/
	public CommPort getCommPort( String PortName, int PortType )
	{
		if (debug) System.out.println("RXTXCommDriver:getCommPort("
			+PortName+","+PortType+")");
		try {
			switch (PortType) {
				case CommPortIdentifier.PORT_SERIAL:
					if(osName.toLowerCase().indexOf("windows") == -1 )
					{
					
						return new RXTXPort( PortName );
					}
					else
					{
						return new RXTXPort( deviceDirectory + PortName );
					}
				case CommPortIdentifier.PORT_PARALLEL:
					//return new LPRPort( PortName );
				default:
					if (debug)
						System.out.println("unknown PortType  "+PortType+" passed to RXTXCommDriver.getCommPort()");
			}
		} catch( PortInUseException e ) {
			if (debug)
				System.out.println(
					"Port "+PortName+" in use by another application");
		}
		return null;
	}

	/*  Yikes.  Trying to call println from C for odd reasons */
	public void Report( String arg )
	{
		System.out.println(arg);
	}
}