int stringring_add(struct stringring *sr, const char *data);
int stringring_find(struct stringring *sr, const char *data, unsigned int max_age);
int stringring_remove(struct stringring *sr, const char *data);
int stringring_add(struct stringring *sr, const char *data);
int stringring_find(struct stringring *sr, const char *data, unsigned int max_age);
int stringring_remove(struct stringring *sr, const char *data);