fmt_origin
const char *fmt_origin(uint8_t, int);
printf("%s\n", fmt_origin(r->origin, 1));
fmt_origin(r->origin, 0), r->med, r->local_pref, r->weight,
printf("%s", fmt_origin(origin, 0));
json_do_string("origin", fmt_origin(origin, 0));
json_do_string("origin", fmt_origin(r->origin, 0));