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#include <arpa/inet.h>
#include <assert.h>
int main() {
struct in_addr addr;
assert(inet_pton(AF_INET, "1.1.1.1", &addr));
assert((addr.s_addr & 0xFF) == 1);
assert(((addr.s_addr >> 8) & 0xFF) == 1);
assert(((addr.s_addr >> 16) & 0xFF) == 1);
assert(((addr.s_addr >> 24) & 0xFF) == 1);
assert(!inet_pton(AF_INET, "256.999.1234.555", &addr));
assert(!inet_pton(AF_INET, "a.b.c.d", &addr));
return 0;
}
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