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in6addr_isany.c
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#undef  __CRT__NO_INLINE
#define __CRT__NO_INLINE
#include <winsock2.h>
#include <ws2tcpip.h>

#undef  IN6_IS_ADDR_UNSPECIFIED
#define IN6_IS_ADDR_UNSPECIFIED(a)  ( ((a)->s6_words[0] == 0) &&  \
                                ((a)->s6_words[1] == 0) &&  \
                                ((a)->s6_words[2] == 0) &&  \
                                ((a)->s6_words[3] == 0) &&  \
                                ((a)->s6_words[4] == 0) &&  \
                                ((a)->s6_words[5] == 0) &&  \
                                ((a)->s6_words[6] == 0) &&  \
                                ((a)->s6_words[7] == 0) )

int IN6ADDR_ISANY(const struct sockaddr_in6 *a)
{
      return ((a->sin6_family == AF_INET6) &&
            IN6_IS_ADDR_UNSPECIFIED(&a->sin6_addr));
}

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