pokeemerald/src/money.c

#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);
}