Code for validating email address in c

Dan Extending it for IPAddressv4:port shouldn't be that difficult to anyone who has understood how the current version works (which, of course, excludes qazmlp). You could also argue that because of locale's the above will catch...

#define PORTMAX 65535 /* or whatever appropriate */ int validate IP(char *ipadd) The original version, as posted by the OP, would catch "1.2.3.4=" because scanf would return 5 instead of 4. This points out a bug in my version above: "1.2.3.4.5" will not be identified as an invalid IP address. = ':') return INVALID; if ((b1 | b2 | b3 | b4) Even simpler, 12 is a valid unsigned number. I still can't figure out if this guy (quasilump or whatever) is an elaborate troll or the world's slowest-learning programmer.

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The more paranoid check at the end was added in response to some criticism from Tak-Shing :-) Extending it for IPAddressv4:port shouldn't be that difficult to anyone who has understood how the current version works (which, of course, excludes qazmlp).

#define PORTMAX 65535 /* or whatever appropriate */ int validate IP(char *ipadd) Trivia quiz: what is the purpose of the last check?

[code snipped] What is the best & fastest way of validating an IPv4 address?

Currently I have the following code to validate the first format. Also, please suggest a mechanism tovalidate the second format(address:port) also.#define INVALID -1#define VALID 0int validate IP(char *ipadd) This looks exactly like code I've posted a couple of years ago.else, call the 1st version of validate IP() which handles 'ipaddress' format.Trivia quiz: what is the purpose of the last check? 78" would pass all the other tests, yet it hardly looks like a valid IP address.Dan -- Dan Pop DESY Zeuthen, RZ group Email: Da*****@Here's the complete list of C99 type "aliases": - short, signed short, short int, or signed short int - unsigned short, or unsigned short int - int, signed, or signed int - unsigned, or unsigned int - long, signed long, long int, or signed long int - unsigned long, or unsigned long int - long long, signed long long, long long int, or signed long long int - unsigned long long, or unsigned long long int Dan -- Dan Pop DESY Zeuthen, RZ group Email: Da*****@The original version, as posted by the OP, would catch "1.2.3.4=" because scanf would return 5 instead of 4. This points out a bug in my version above: "1.2.3.4.5" will not be identified as an invalid IP address. = ':') return INVALID; if ((b1 | b2 | b3 | b4) The original version, as posted by the OP, would catch "1.2.3.4=" because scanf would return 5 instead of 4. This points out a bug in my version above: "1.2.3.4.5" will not be identified as an invalid IP address. = ':') return INVALID; if ((b1 | b2 | b3 | b4) I'll assume because strtoul() doens't do any checking on input, which makes "-0" valid as an unsidnged number.So, back to the drawing board: rc = sscanf(ipadd, "%3u.%3u.%3u.%3u%c%u%c", &b1, &b2, &b3, &b4, &sep, &port, &c); if (rc ! So, back to the drawing board: rc = sscanf(ipadd, "%3u.%3u.%3u.%3u%c%u%c", &b1, &b2, &b3, &b4, &sep, &port, &c); if (rc ! You could also argue that because of locale's the above will catch...You can use this Regex pattern to validate Email Address string pattern and also to check whether the given EMail Address contains Valid Email Domain or Not.

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