Converting IP from C string to unsigned int?

Question

I've got a quick question; I have an IPv4 in a C string (say "192.168.0.1") and I want to convert it to an uint32_t. I'm sure there should be some function for that but I havn't found it. Any ideas?

`uint32_t` is not an appropriate type for addresses. This is 2011 and modern software **must** support IPv6. Store addresses as strings for any data interchange, and in the `struct addrinfo *` returned by `getaddrinfo` for internal user. — R.. GitHub STOP HELPING ICE, Sep 16 '11 at 13:13

cnicutar · Accepted Answer · 2011-09-16T11:28:25.713

10

The function is called inet_aton.

int inet_aton(const char *cp, struct in_addr *inp);

The structure in_addr is defined in <netinet/in.h> as:

typedef uint32_t in_addr_t;

struct in_addr {
    in_addr_t s_addr;
};

Of course you can also use the newer function inet_pton.

edited Sep 16 '11 at 11:28

answered Sep 16 '11 at 11:14

cnicutar

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dosn't inet_aton convert the char* into an sockaddr struct? – KaiserJohaan Sep 16 '11 at 11:15
2

@KaiserJohaan Yes, and inside it you will find `s_addr` which is `unit32_t` – cnicutar Sep 16 '11 at 11:16
When it comes to windows i guess you are stuck with inet_addr? Since inet_aton dosnt seem to be defined in windows – KaiserJohaan Sep 16 '11 at 11:25
1

@KaiserJohaan Windows has `inet_pton`. – cnicutar Sep 16 '11 at 11:28
inet_pton is only supported after windows vista. http://msdn.microsoft.com/en-us/library/windows/desktop/cc805844(v=vs.85).aspx As far as I know for xp you have to use inet_aton. – rem7 Jan 14 '12 at 17:38
@rem7 Yes the page says "Minimum supported client.. Vista". – cnicutar Jan 14 '12 at 17:40
oops. I guess that's a >=vista ;) – rem7 Jan 15 '12 at 00:33

Converting IP from C string to unsigned int?

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