1 files changed, 55 insertions, 0 deletions
diff --git a/src/money.c b/src/money.c
new file mode 100644
index 000000000..be64d9633
--- /dev/null
+++ b/src/money.c
@@ -0,0 +1,55 @@
+#include "global.h"
+#include "money.h"
+
+#define MAX_MONEY 999999
+
+u32 GetMoney(u32* moneyPtr)
+{
+    return *moneyPtr ^ gSaveBlock2Ptr->encryptionKey;
+}
+
+void SetMoney(u32* moneyPtr, u32 newValue)
+{
+    *moneyPtr = gSaveBlock2Ptr->encryptionKey ^ newValue;
+}
+
+bool8 IsEnoughMoney(u32* moneyPtr, u32 cost)
+{
+    if (GetMoney(moneyPtr) >= cost)
+        return TRUE;
+    else
+        return FALSE;
+}
+
+void AddMoney(u32* moneyPtr, u32 toAdd)
+{
+    u32 toSet = GetMoney(moneyPtr);
+
+    // can't have more money than MAX
+    if (toSet + toAdd > MAX_MONEY)
+    {
+        toSet = MAX_MONEY;
+    }
+    else
+    {
+        toSet += toAdd;
+        // check overflow, can't have less money after you receive more
+        if (toSet < GetMoney(moneyPtr))
+            toSet = MAX_MONEY;
+    }
+
+    SetMoney(moneyPtr, toSet);
+}
+
+void SubtractMoney(u32* moneyPtr, u32 toSub)
+{
+    u32 toSet = GetMoney(moneyPtr);
+
+    // can't subtract more than you already have
+    if (toSet < toSub)
+        toSet = 0;
+    else
+        toSet -= toSub;
+
+    SetMoney(moneyPtr, toSet);
+}