c - asprintf();导致内存问题

Question

我正在使用 asprintf(&somestring,"%s%s",stringone,stringtwo) 来连接字符串。如果我调用一次然后调用 free(somestring) 一次，它工作正常。但是，如果我多次调用 asprintf() 但在递归函数中只调用一次 free(somestring) ，我就会遇到问题。是否需要为每个 asprintf() 调用 free()？

Answer 1

_{Does free() need to be called for every asprintf()?}

是的。根据其 documentation :

The functions asprintf() and vasprintf() are analogs of sprintf(3) and vsprintf(3), except that they allocate a string large enough to hold the output including the terminating null byte, and return a pointer to it via the first argument. This pointer should be passed to free(3) to release the allocated storage when it is no longer needed.