A warning is printed to the user if a buffer wrap condition has occurred.
如果发生了缓冲区回绕，就向用户输出警告。
In a buffer wrap condition, the first read returns only the keyword BUF_WRAP.
如果出现缓冲区回绕，第一个read只返回关键字BUF _WRAP。
In a buffer wrap condition, the first read returns only the keyword BUF_WRAP.
如果出现缓冲区回绕，第一个read只返回关键字BUF _WRAP。
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