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/* Test derived from Glibc's getifaddrs_internal. The code could be
rewritten to avoid the warning for the memcpy call but since unions
are designed to have their members treated as interchangeable there
isn't a whole lot to be gained from issuing one.
{ dg-do compile }
{ dg-options "-O2 -Wall" } */
typedef __SIZE_TYPE__ size_t;
extern void* memcpy (void*, const void*, size_t);
struct sockaddr
{
short sa_family;
char sa_data[14];
};
struct in_addr
{
int s_addr;
};
struct in6_addr
{
union
{
char __u6_addr8[16];
short __u6_addr16[8];
int __u6_addr32[4];
} __in6_u;
};
struct sockaddr_in
{
short sin_family;
short sin_port;
struct in_addr sin_addr;
unsigned char sin_zero[sizeof (struct sockaddr) -
(sizeof (short)) -
sizeof (short) -
sizeof (struct in_addr)];
};
struct sockaddr_in6
{
short sin6_family;
short sin6_port;
int sin6_flowinfo;
struct in6_addr sin6_addr;
int sin6_scope_id;
};
union
{
struct sockaddr sa;
struct sockaddr_in s4;
struct sockaddr_in6 s6;
} u1, u2;
struct sockaddr *sa;
void test_unconditional (void *p)
{
sa = &u1.sa;
memcpy (&((struct sockaddr_in6 *) sa)->sin6_addr, p, 16);
}
void test_conditional (void *p, int i)
{
sa = i ? &u1.sa : &u2.sa;
memcpy (&((struct sockaddr_in6 *) sa)->sin6_addr, p, 16);
}
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