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in6_is_addr_mc_linklocal.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_MULTICAST
#define IN6_IS_ADDR_MULTICAST(a)    ( (a)->s6_bytes[0] == 0xff )

int IN6_IS_ADDR_MC_LINKLOCAL(const struct in6_addr *a)
{
      return IN6_IS_ADDR_MULTICAST(a) &&
            ((a->s6_bytes[1] & 0xf) == 2);
}

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