(svn r24604) [1.2] -Backport from trunk:

- Fix: Do not show profit from refits as cost in the refit window [FS#5297] (r24544)
- Fix: Do not limit to reading one UDP packet per game loop (r24532)
- Fix: Max script chance was too big (r24531)
- Fix: [NewGRF] RandomAction 84 should interpret register 100 as signed (r24528)

src/lang/english.txt

@@ -3262,8 +3262,10 @@ STR_VEHICLE_DETAILS_TRAIN_ARTICULATED_RV_CAPACITY               :{BLACK}Capacity
 # Vehicle refit
 STR_REFIT_CAPTION                                               :{WHITE}{VEHICLE} (Refit)
 STR_REFIT_TITLE                                                 :{GOLD}Select cargo type to carry:
-STR_REFIT_NEW_CAPACITY_COST_OF_REFIT                            :{BLACK}New capacity: {GOLD}{CARGO_LONG}{}{BLACK}Cost of refit: {GOLD}{CURRENCY_LONG}
-STR_REFIT_NEW_CAPACITY_COST_OF_AIRCRAFT_REFIT                   :{BLACK}New capacity: {GOLD}{CARGO_LONG}, {GOLD}{CARGO_LONG}{}{BLACK}Cost of refit: {GOLD}{CURRENCY_LONG}
+STR_REFIT_NEW_CAPACITY_COST_OF_REFIT                            :{BLACK}New capacity: {GOLD}{CARGO_LONG}{}{BLACK}Cost of refit: {RED}{CURRENCY_LONG}
+STR_REFIT_NEW_CAPACITY_INCOME_FROM_REFIT                        :{BLACK}New capacity: {GOLD}{CARGO_LONG}{}{BLACK}Income from refit: {GREEN}{CURRENCY_LONG}
+STR_REFIT_NEW_CAPACITY_COST_OF_AIRCRAFT_REFIT                   :{BLACK}New capacity: {GOLD}{CARGO_LONG}, {GOLD}{CARGO_LONG}{}{BLACK}Cost of refit: {RED}{CURRENCY_LONG}
+STR_REFIT_NEW_CAPACITY_INCOME_FROM_AIRCRAFT_REFIT               :{BLACK}New capacity: {GOLD}{CARGO_LONG}, {GOLD}{CARGO_LONG}{}{BLACK}Income from refit: {GREEN}{CURRENCY_LONG}
 STR_REFIT_SELECT_VEHICLES_TOOLTIP                               :{BLACK}Select the vehicles to refit. Dragging with the mouse allows to select multiple vehicles. Clicking on an empty space will select the whole vehicle. Ctrl+Click will select a vehicle and the following chain
 
 STR_REFIT_TRAIN_LIST_TOOLTIP                                    :{BLACK}Select type of cargo for train to carry

src/network/core/udp.cpp

@@ -117,18 +117,21 @@ void NetworkUDPSocketHandler::SendPacket(Packet *p, NetworkAddress *recv, bool a
 void NetworkUDPSocketHandler::ReceivePackets()
 {
 	for (SocketList::iterator s = this->sockets.Begin(); s != this->sockets.End(); s++) {
-		struct sockaddr_storage client_addr;
-		memset(&client_addr, 0, sizeof(client_addr));
+		for (int i = 0; i < 1000; i++) { // Do not infinitely loop when DoSing with UDP
+			struct sockaddr_storage client_addr;
+			memset(&client_addr, 0, sizeof(client_addr));
 
-		Packet p(this);
-		socklen_t client_len = sizeof(client_addr);
+			Packet p(this);
+			socklen_t client_len = sizeof(client_addr);
 
-		/* Try to receive anything */
-		SetNonBlocking(s->second); // Some OSes seem to lose the non-blocking status of the socket
-		int nbytes = recvfrom(s->second, (char*)p.buffer, SEND_MTU, 0, (struct sockaddr *)&client_addr, &client_len);
+			/* Try to receive anything */
+			SetNonBlocking(s->second); // Some OSes seem to lose the non-blocking status of the socket
+			int nbytes = recvfrom(s->second, (char*)p.buffer, SEND_MTU, 0, (struct sockaddr *)&client_addr, &client_len);
+
+			/* Did we get the bytes for the base header of the packet? */
+			if (nbytes <= 0) break;    // No data, i.e. no packet
+			if (nbytes <= 2) continue; // Invalid data; try next packet
 
-		/* We got some bytes for the base header of the packet. */
-		if (nbytes > 2) {
 			NetworkAddress address(client_addr, client_len);
 			p.PrepareToRead();
 
@@ -136,7 +139,7 @@ void NetworkUDPSocketHandler::ReceivePackets()
 			 * Otherwise it will be marked as corrupted later on. */
 			if (nbytes != p.size) {
 				DEBUG(net, 1, "received a packet with mismatching size from %s", address.GetAddressAsString());
-				return;
+				continue;
 			}
 
 			/* Handle the packet */

src/newgrf_engine.cpp

@@ -349,12 +349,19 @@ static inline const Vehicle *GRV(const ResolverObject *object)
 		case VSG_SCOPE_PARENT: return object->u.vehicle.parent;
 		case VSG_SCOPE_RELATIVE: {
 			if (object->u.vehicle.self == NULL) return NULL;
+
+			int32 count = GB(object->count, 0, 4);
+			if (count == 0) count = GetRegister(0x100);
+
 			const Vehicle *v = NULL;
 			switch (GB(object->count, 6, 2)) {
 				default: NOT_REACHED();
 				case 0x00: // count back (away from the engine), starting at this vehicle
+					v = object->u.vehicle.self;
+					break;
 				case 0x01: // count forward (toward the engine), starting at this vehicle
 					v = object->u.vehicle.self;
+					count = -count;
 					break;
 				case 0x02: // count back, starting at the engine
 					v = object->u.vehicle.parent;
@@ -372,10 +379,7 @@ static inline const Vehicle *GRV(const ResolverObject *object)
 					break;
 				}
 			}
-			uint32 count = GB(object->count, 0, 4);
-			if (count == 0) count = GetRegister(0x100);
-			while (v != NULL && count-- != 0) v = (GB(object->count, 6, 2) == 0x01) ? v->Previous() : v->Next();
-			return v;
+			return v->Move(count);
 		}
 	}
 }

src/script/api/script_base.cpp

@@ -11,6 +11,7 @@
 
 #include "../../stdafx.h"
 #include "script_base.hpp"
+#include "script_error.hpp"
 #include "../../network/network.h"
 #include "../../core/random_func.hpp"
 
@@ -42,7 +43,8 @@
 
 /* static */ bool ScriptBase::Chance(uint out, uint max)
 {
-	return (uint16)Rand() <= (uint16)((65536 * out) / max);
+	EnforcePrecondition(false, out <= max);
+	return (uint16)Rand() <= (uint16)((65535 * out) / max);
 }
 
 /* static */ bool ScriptBase::ChanceItem(int unused_param, uint out, uint max)

src/script/api/script_base.hpp

@@ -59,6 +59,7 @@ public:
 	 *   After all, it is a random function.
 	 * @param out How many times it should return true.
 	 * @param max Out of this many times.
+	 * @pre \a out is at most equal to \a max.
 	 * @return True if the chance worked out.
 	 */
 	static bool Chance(uint out, uint max);

src/vehicle_base.h

@@ -538,6 +538,22 @@ public:
 		return v;
 	}
 
+	/**
+	 * Get the vehicle at offset \a n of this vehicle chain.
+	 * @param n Offset from the current vehicle.
+	 * @return The new vehicle or NULL if the offset is out-of-bounds.
+	 */
+	inline const Vehicle *Move(int n) const
+	{
+		const Vehicle *v = this;
+		if (n < 0) {
+			for (int i = 0; i != n && v != NULL; i--) v = v->Previous();
+		} else {
+			for (int i = 0; i != n && v != NULL; i++) v = v->Next();
+		}
+		return v;
+	}
+
 	/**
 	 * Get the first order of the vehicles order list.
 	 * @return first order of order list.

src/vehicle_gui.cpp

@@ -600,14 +600,25 @@ struct RefitWindow : public Window {
 		SetDParam(0, option->cargo);
 		SetDParam(1, _returned_refit_capacity);
 
+		Money money = cost.GetCost();
 		if (_returned_mail_refit_capacity > 0) {
 			SetDParam(2, CT_MAIL);
 			SetDParam(3, _returned_mail_refit_capacity);
-			SetDParam(4, cost.GetCost());
-			return STR_REFIT_NEW_CAPACITY_COST_OF_AIRCRAFT_REFIT;
+			if (money <= 0) {
+				SetDParam(4, -money);
+				return STR_REFIT_NEW_CAPACITY_INCOME_FROM_AIRCRAFT_REFIT;
+			} else {
+				SetDParam(4, money);
+				return STR_REFIT_NEW_CAPACITY_COST_OF_AIRCRAFT_REFIT;
+			}
 		} else {
-			SetDParam(2, cost.GetCost());
-			return STR_REFIT_NEW_CAPACITY_COST_OF_REFIT;
+			if (money <= 0) {
+				SetDParam(2, -money);
+				return STR_REFIT_NEW_CAPACITY_INCOME_FROM_REFIT;
+			} else {
+				SetDParam(2, money);
+				return STR_REFIT_NEW_CAPACITY_COST_OF_REFIT;
+			}
 		}
 	}