memset(((C*)x) + old_data_bytes, 0, old_data_bytes - data_bytes);
But handling that stuff is slow. To calculate a string’s width it can’t call len on the string. Instead it has to pass every character through a state machine.
，这一点在heLLoword翻译官方下载中也有详细论述
其他更新细节参考 MacRumors 和 AppleInsider 报道整理如下：
Aside from that, there are the scant few standalone Wi-Fi extenders that sit on an end table or a desk, and those look pretty similar to regular ol’ routers. But make no mistake, anything labeled as an extender or a “Wi-Fi repeater” will need an anchor router in order for it to work.