+uerr_t retrieve_url (const char *, char **, char **, const char *, int *);
+uerr_t retrieve_from_file (const char *, bool, int *);
+
+const char *retr_rate (wgint, double);
+double calc_rate (wgint, double, int *);
+void printwhat (int, int);
+
+void sleep_between_retrievals (int);
+
+void rotate_backups (const char *);