strncpy_s与_TRUNCATE

最新推荐文章于 2025-07-14 22:37:17 发布

wangshenqiang

最新推荐文章于 2025-07-14 22:37:17 发布

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文章标签： c++ 算法开发语言

本文链接：https://blog.youkuaiyun.com/wangshenqiang/article/details/148609199

测试代码

    std::cout << " --------------------------------------------------------------- " << std::endl;
    char arr[10] = {0};
    std::cout << "strncpy_s ret = " << strncpy_s(arr, sizeof(arr), "1234512345", _TRUNCATE) << std::endl;//可以
    std::cout << "strncpy_s contains: " << arr << " , _countof(arr) = " << _countof(arr) << std::endl;
    std::cout << " --------------------------------------------------------------- " << std::endl;
    memset(arr, 0, _countof(arr));
    std::cout << "strncpy_s ret = " << strncpy_s(arr, sizeof(arr), "1234512345", _countof("1234512345")) << std::endl;//危险
    std::cout << "strncpy_s contains: " << arr << " , _countof(arr) = " << _countof(arr) << std::endl;

测试输出

 --------------------------------------------------------------- 
strncpy_s ret = 80
strncpy_s contains: 123451234 , _countof(arr) = 10
 --------------------------------------------------------------- 
Invalid parameter passed to C runtime function.
strncpy_s ret = 34
strncpy_s contains:  , _countof(arr) = 10

e,所谓的安全函数，参数不对还是会“崩”，如果设置的参数不对依然有风险