Hex IP to Decimal IP conversion

Question

How can I convert a hex ip (such as 42477f35), and get it to spit out the correct decimal ip (in the example before, the correct result is 66.71.127.53

Answer 1

This is one possibility:

#include 

int ip_hex_to_dquad(const char *input, char *output, size_t outlen)
{
    unsigned int a, b, c, d;

    if (sscanf(input, "%2x%2x%2x%2x", &a, &b, &c, &d) != 4)
        return -1;

    snprintf(output, outlen, "%u.%u.%u.%u", a, b, c, d);
    return 0;
}