ipv6地址累加函数

#include <stdio.h>

#include <arpa/inet.h>

int main()

{

    int i;

    int ret;

    struct in6_addr addr6;

    unsigned long ul1, ul2, ul3, ul0;

    char str[INET6_ADDRSTRLEN] = {};

    ret = inet_pton(AF_INET6, "ff02::12", &addr6);

    if (ret != ) {

        perror("inet_pton()");

        return -;

    }

    for (i = ; i < ; i++) {

        ul3 = addr6.s6_addr32[];

        ul2 = addr6.s6_addr32[];

        ul1 = addr6.s6_addr32[];

        ul0 = addr6.s6_addr32[];

        ul3 = ntohl(ul3)+;

        if (ul3) {

            goto u3;

        }

        ul2 = ntohl(ul2)+;

        if (ul2) {

            goto u2;

        }

        ul1 = ntohl(ul1)+;

        if (ul1) {

            goto u1;

        }

        ul0 = ntohl(ul0)+;

        addr6.s6_addr32[] = htonl(ul0);

u1:

        addr6.s6_addr32[] = htonl(ul1);

u2:

        addr6.s6_addr32[] = htonl(ul2);

u3:

        addr6.s6_addr32[] = htonl(ul3);

        if ((inet_ntop(AF_INET6, &addr6, str, INET6_ADDRSTRLEN)) != NULL) {

            printf("%s\n", str);

        } else {

            fprintf(stderr, "inet_ntop() error\n");

            return -;

        }

    }

    return ;

}