dcopclient: Use default path for XDG_RUNTIME_DIR if the variable is not set.

This resolves issue TDE/tdebase#241.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 81d495430d)

dcop/client/dcop.cpp

@@ -590,17 +590,22 @@ int runDCOP( QCStringList args, UserList users, Session session,
 	    }
 	}
 
-	if( users.count() > 1 || ( users.count() == 1 &&
-	    ( getenv( "ICEAUTHORITY" ) == 0 || getenv( "DISPLAY" ) == 0 ) ) )
+	if ((users.count() > 1) || ((users.count() == 1) &&
+		((getenv("ICEAUTHORITY") == 0) || (getenv("DISPLAY") == 0))))
 	{
 		// Check for ICE authority file and if the file can be read by us
 		TQString iceFileBase = "ICEauthority";
 		TQString iceFile;
 		TQFileInfo fi;
 
-	    if (getenv("XDG_RUNTIME_DIR") != 0 )
+		TQString xdgRuntimeDir = TQString::fromLocal8Bit(getenv("XDG_RUNTIME_DIR"));
+		if (xdgRuntimeDir.isEmpty())
+		{
+			xdgRuntimeDir = "/run/user/<uid>";
+		}
+		if (!xdgRuntimeDir.isEmpty())
 		{
-		TQFileInfo xdgRuntime(getenv("XDG_RUNTIME_DIR"));
+			TQFileInfo xdgRuntime(xdgRuntimeDir);
 			passwd* pstruct = getpwnam(it.key().local8Bit());
 			if (pstruct)
 			{
@@ -628,7 +633,7 @@ int runDCOP( QCStringList args, UserList users, Session session,
 		{
 			if (fi.isReadable())
 			{
-		    char *envStr = strdup( ( "ICEAUTHORITY=" + iceFile ).ascii() );
+				char *envStr = strdup(("ICEAUTHORITY=" + iceFile).local8Bit());
 				putenv(envStr);
 				//cerr_ << "ice: " << envStr << endl;
 			}
@@ -643,7 +648,9 @@ int runDCOP( QCStringList args, UserList users, Session session,
 		else
 		{
 			if (users.count() > 1)
+			{
 				continue;
+			}
 			else
 			{
 				cerr_ << "WARNING: Cannot find ICE authority file "