如果找到搜索字符串，则所得结果是一个从1到输入字符串实际长度之间的一个数字，使用显式指定的代码单元来表示。

If string to be searched is found, the result is a number from 1 to the actual length of input string, expressed in the code units that are explicitly specified.

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为了避免这一点，您必须显式地向代码添加字符串长度检查。

To avoid this, you must explicitly add string length checks to the code.

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通常，一种有用的方法是，向“计数字符串”函数传递比缓冲区大小小一的长度，然后将零显式赋给缓冲区中的最后一个字符。

In general, one useful approach is to pass a length to the 'counted string' function one smaller than the size of the buffer and then explicitly assign zero to the last character in the buffer.

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