Add finance_check_money_required and finance_check_affordability helper functions.

src/openrct2/management/Finance.cpp

@@ -11,6 +11,7 @@
 
 #include "../Context.h"
 #include "../Game.h"
+#include "../OpenRCT2.h"
 #include "../interface/Window.h"
 #include "../localisation/Date.h"
 #include "../localisation/Localisation.h"
@@ -64,6 +65,39 @@ money32 gExpenditureTable[EXPENDITURE_TABLE_MONTH_COUNT][RCT_EXPENDITURE_TYPE_CO
 
 uint8_t gCommandExpenditureType;
 
+/**
+ * Checks the condition if the game is required to use money.
+ * @param flags game command flags.
+ */
+bool finance_check_money_required(uint32_t flags)
+{
+    if (gParkFlags & PARK_FLAGS_NO_MONEY)
+        return false;
+    if (gScreenFlags & SCREEN_FLAGS_EDITOR)
+        return false;
+    if (flags & GAME_COMMAND_FLAG_5)
+        return false;
+    if (flags & GAME_COMMAND_FLAG_GHOST)
+        return false;
+    return true;
+}
+
+/**
+ * Checks if enough money is available.
+ * @param cost.
+ * @param flags game command flags.
+ */
+bool finance_check_affordability(money32 cost, uint32_t flags)
+{
+    if (finance_check_money_required(flags) == false)
+        return true;
+    if (cost <= 0)
+        return true;
+    if (cost <= gCash)
+        return true;
+    return false;
+}
+
 /**
  * Pay an amount of money.
  *  rct2: 0x069C674

src/openrct2/management/Finance.h

@@ -63,6 +63,8 @@ extern money32 gExpenditureTable[EXPENDITURE_TABLE_MONTH_COUNT][RCT_EXPENDITURE_
 
 extern uint8_t gCommandExpenditureType;
 
+bool finance_check_money_required(uint32_t flags);
+bool finance_check_affordability(money32 cost, uint32_t flags);
 void finance_payment(money32 amount, rct_expenditure_type type);
 void finance_pay_wages();
 void finance_pay_research();