确定一个字符串在C有效的IP地址 [英] Determine if a string is a valid IP address in C

问题描述

什么是确定一个字符串包含IP地址的好方法。我应该使用ISDIGIT（）？

What would be a good way to determine if a string contains an IP address. Should I use isdigit()?

建议将AP preciate它。

Suggestions would be appreciate it.

感谢

推荐答案

我问<一个href=\"http://stackoverflow.com/questions/318236/how-do-you-validate-that-a-string-is-a-valid-ip-address-in-c\">a对于C ++ 类似的问题。您应该能够使用稍微修改（C）的版本是我想出了当时的情况。

I asked a similar question for C++. You should be able to use a slightly modified (for C) version of what I came up with back then.

bool isValidIpAddress(char *ipAddress)
{
    struct sockaddr_in sa;
    int result = inet_pton(AF_INET, ipAddress, &(sa.sin_addr));
    return result != 0;
}

您需要的#include＆LT; ARPA / inet.h＆GT; 使用的 inet_pton（）函数

更新基于意见的问题：如果你想知道，如果C风格字符串的包含的IP地址，那么你应该迄今给出的两个答案结合起来。使用常规的前pression发现大致匹配的IP地址模式，然后使用功能上面来检查的比赛看它是否是真正的交易。

Update based on comments to the question: If you want to know if a C-style string contains an IP address, then you should combine the two answers given so far. Use a regular expression to find patterns that roughly match an IP address, then use the function above to check the match to see if it's the real deal.

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