返回指向静态数据的指针可能会导致函数不可重入。
Returning a pointer to static data may cause a function to be non-reentrant.
不返回指向静态数据的指针；所有数据都由函数的调用者提供。
Does not return a pointer to static data; all data is provided by the caller of the function?
不返回指向静态数据的指针；所有数据都由函数的调用者提供。
Does not return a pointer to static data; all data is provided by the caller of the function?
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