【Lua实战】整数溢出边界：经验值爆表的截断保护

-- 整数溢出：入账钳制
local player = class(actor)
local EXP_CAP = 2147483647
local function addExpSafe(player, amount)
    local cur = tonumber(getplayvar(player, "HUMAN", "ExpPool") or 0)
    local add = math.min(math.max(0, math.floor(amount)), EXP_CAP - cur)
    if add < math.floor(amount) then
        sendcentermsg(player, 255, 0, "经验池即将溢出，请尽快升级消耗经验！", 0, 8)
        sendmsg(player, 1, 0, "本次截断溢出经验 " .. math.floor(amount) - add .. " 点。")
    end
    setplayvar(player, "HUMAN", "ExpPool", cur + add, true)
end

-- 类型校验：非法输入防护
local player = class(actor)
local function guardedAddExp(player, amount, source)
    if type(amount) ~= "number" or amount ~= amount then
        sendmsg(player, 1, 0, "经验入账参数异常，已拦截。")
        setsysvarex("ExpErrLog", os.date("%Y%m%d%H") .. "|" .. source, true)
        return false
    end
    if amount < 0 then
        sendmsg(player, 1, 0, "负数经验请走扣减通道。")
        return false
    end
    addExpSafe(player, amount)
    return true
end