int grep_databases(void *context, struct database_criterion *cl,
void (*fun)(void *context, struct database *db));
int database_match_criteria(struct database *db, struct database_criterion *cl);
int grep_databases(void *context, struct database_criterion *cl,
void (*fun)(void *context, struct database *db));
int database_match_criteria(struct database *db, struct database_criterion *cl);