Fix bug when starting using the --parkpos option. Create a pointer to a ParkingAssignment object, so that the reference counter doesn't get reset to 0 when the local class is destroyed.

src/ATC/atc_mgr.cxx

@@ -42,7 +42,7 @@ FGATCManager::FGATCManager() {
 }
 
 FGATCManager::~FGATCManager() {
-
+    delete pk;
 }
 
 void FGATCManager::init() {
@@ -105,10 +105,11 @@ void FGATCManager::init() {
     FGAirport *apt = FGAirport::findByIdent(airport); 
     if (apt && onGround) {// && !runway.empty()) {
         FGAirportDynamics* dcs = apt->getDynamics();
-        ParkingAssignment pk(dcs->getParkingByName(parking));
+         pk = new ParkingAssignment(dcs->getParkingByName(parking));
       
         // No valid parking location, so either at the runway or at a random location.
-        if (pk.isValid()) {
+        if (pk->isValid()) {
+            dcs->setParkingAvailable(pk->parking()->guid(), false);
             fp = new FGAIFlightPlan;
             controller = apt->getDynamics()->getStartupController();
             int stationFreq = apt->getDynamics()->getGroundFrequency(1);
@@ -120,11 +121,11 @@ void FGATCManager::init() {
             leg = 1;
             //double, lat, lon, head; // Unused variables;
             //int getId = apt->getDynamics()->getParking(gateId, &lat, &lon, &head);
-            aircraftRadius = pk.parking()->getRadius();
-            string fltType = pk.parking()->getType(); // gate / ramp, ga, etc etc.
+            aircraftRadius = pk->parking()->getRadius();
+            string fltType = pk->parking()->getType(); // gate / ramp, ga, etc etc.
             string aircraftType; // Unused.
             string airline;      // Currently used for gate selection, but a fallback mechanism will apply when not specified.
-            fp->setGate(pk);
+            fp->setGate(*pk);
             if (!(fp->createPushBack(&ai_ac,
                                      false,
                                      apt,
@@ -208,16 +209,17 @@ void FGATCManager::update ( double time ) {
             //cerr << "Shutting down the atc_mgr" << endl;
             return;
         }
-        //cerr << "Size of waypoint cue " << size << " ";
-        //for (int i = 0; i < size; i++) {
-        //    int val = fp->getRouteIndex(i);
-            //cerr << fp->getWayPoint(i)->getName() << " ";
+        // Test code: Print how far we're progressing along the taxi route. 
+        //std::cerr << "Size of waypoint cue " << size << " ";
+        for (int i = 0; i < size; i++) {
+            int val = fp->getRouteIndex(i);
+            //std::cerr << fp->getWayPoint(i)->getName() << " ";
             //if ((val) && (val != pos)) {
-                //intentions.push_back(val);
-                //cerr << "[done ] " << endl;
+            //    intentions.push_back(val);
+            //    std::cerr << "[done ] " << std::endl;
             //}
-        //}
-        //cerr << "[done ] " << endl;
+        }
+        //std::cerr << "[done ] " << std::endl;
     }
     if (fp) {
         //cerr << "Currently at leg : " << fp->getLeg() << endl;

src/ATC/atc_mgr.hxx

@@ -53,6 +53,7 @@ private:
   bool networkVisible;
   bool initSucceeded;
   SGPropertyNode_ptr trans_num;
+  ParkingAssignment *pk;
 
 public:
   FGATCManager();

src/Main/positioninit.cxx

@@ -183,6 +183,10 @@ static bool setPosFromAirportIDandHdg( const string& id, double tgt_hdg ) {
 // Set current_options lon/lat given an airport id and parkig position name
 static bool fgSetPosFromAirportIDandParkpos( const string& id, const string& parkpos )
 {
+  string fltType;
+  string acOperator;
+  string acType; // Currently not used by findAvailable parking, so safe to leave empty.
+  SGPath acData;
   if ( id.empty() )
     return false;
   
@@ -202,9 +206,7 @@ static bool fgSetPosFromAirportIDandParkpos( const string& id, const string& par
   ParkingAssignment pka;
   double radius = fgGetDouble("/sim/dimensions/radius-m");
   if ((parkpos == string("AVAILABLE")) && (radius > 0)) {
-    string fltType;
-    string acOperator;
-    SGPath acData;
+    
     try {
       acData = globals->get_fg_home();
       acData.append("aircraft-data");
@@ -232,9 +234,10 @@ static bool fgSetPosFromAirportIDandParkpos( const string& id, const string& par
       acOperator = fgGetString("/sim/aircraft-operator"   );
     }
     
-    string acType; // Currently not used by findAvailable parking, so safe to leave empty.
+    
     pka = dcs->getAvailableParking(radius, fltType, acType, acOperator);
     if (pka.isValid()) {
+        // why is the following line necessary?
       fgGetString("/sim/presets/parkpos");
       fgSetString("/sim/presets/parkpos", pka.parking()->getName());
     } else {
@@ -243,6 +246,7 @@ static bool fgSetPosFromAirportIDandParkpos( const string& id, const string& par
       return false;
     }
   } else {
+      
     pka = dcs->getParkingByName(parkpos);
     if (!pka.isValid()) {
       SG_LOG( SG_GENERAL, SG_ALERT,
@@ -250,7 +254,14 @@ static bool fgSetPosFromAirportIDandParkpos( const string& id, const string& par
       return false;
     }
   }
-  
+  // Why is the following line necessary?
+  fgGetString("/sim/presets/parkpos");
+  fgSetString("/sim/presets/parkpos", pka.parking()->getName());
+  // The problem is, this line doesn't work because the ParkingAssignment's refcounting mechanism:
+  // The parking will be released after this function returns. 
+  // As a temporary measure, I'll try to reserve the parking via the atc_manager, which should work, because it uses the same 
+  // mechanism as the AI traffic code. 
+  dcs->setParkingAvailable(pka.parking()->guid(), false);
   fgApplyStartOffset(pka.parking()->geod(), pka.parking()->getHeading());
   return true;
 }