#include <stdio.h>

int (*state)(typeof(state));

int sm_first(state_t *state);
int sm_second(state_t *state);
int sm_third(state_t *state);
int sm_done(state_t *state);

int sm_first(state_t *state)
{
	printf("first\n");
	*state = &sm_second;
	return 1;
}

int sm_second(state_t *state)
{
	*state = &sm_third;
	printf("second\n");
	return 1;
}

int sm_third(state_t *state)
{
	*state = &sm_done;
	printf("third\n");
	return 1;
}

int sm_done(state_t *state)
{
	printf("done\n");
	return 0;
}

int main()
{
	state_t state = sm_first;
	while (state(&state));
	return 0;
}