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Make use of return values to communicate information and to make error trapping easy for the calling program.
用好返回值，使得错误处理简单一些。
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Do not exit from functions. Instead, return an error value to allow the calling program flexibility in handling the error.
不要在函数中使用exit，明确的返回错误码，让caller来决定到底怎么办。
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Make functions general but usable. (Sometimes these are conflicting goals.)
既通用，又好用。
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Do not make unnecessary assumptions about sizes of buffers. (This is often hard to implement.)
不要对输入buffer的长度做不必要的架设。
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When it is necessary to use limits, use standard system-defined limits rather than arbitrary constants.
尽可能使用系统的limits
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Do not reinvent the wheel—use standard library functions when possible.
尽可能使用标准库
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Do not modify input parameter values unless it makes sense to do so.
尽可能不要修改输入参数
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Do not use static variables or dynamic memory allocation if automatic allocation will do just as well.
如果自动变量就能搞定，不要用static变量。
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Analyze all the calls to the malloc family to make sure the program frees the memory that was allocated.
看好malloc，避免泄露。
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Consider whether a function is ever called recursively or from a signal handler or from a thread. Functions with variables of static storage class may not behave in the desired way. (The error number can cause a big problem here.)
在函数被递归调用，或反复调用的情况下，static变量的存在，将会导致不可预期的行为。
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Analyze the consequences of interruptions by signals.
要把signal的中断考虑进来。
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Carefully consider how the entire program terminates.
小心处理程序的退出。