我们还定义了宏inbufsiz，它是在读取输入时用作缓冲区的字符数组的大小。
We also define a macro INBUFSIZ, which is the size of a character array used as a buffer while reading the input.
当复制到 s1 的字符串长于 s1 的分配大小（即 BUFSIZE，一个在 stdio.h 中定义的常数）时，就会发生缓冲区溢出情况。
This can happen if the string copied into s1 is longer than the allocated size of s1, which is BUFSIZ (a constant defined in stdio.h).
连接字符串，它定义在与数据存储区(如数据库)建立连接时所使用的信息。
Connection strings, which define information that is used to establish a connection to a data store, such as a database.
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