strtoul 和 errno

系统为Linux

strtoul 返回的时候，如果输入字串错误或溢出，会设置errno为ERANGE, 如果是过大溢出，则返回值为ULONG_MAX.

不过有一点，就是调用方在调用strtoul之前需要自己手工把errno设为0，这个manpage里说了，不过已开始我没看到，害我折腾了好久。。。

其他类似函数strtol之类应该也是这样吧。

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