-void rfc822_write_address(char *, size_t, address_t *, int);
-void rfc822_write_address_single(char *, size_t, address_t *, int);
-void rfc822_cat(char *, size_t, const char *, const char *);
+ssize_t rfc822_write_address(char *, ssize_t, address_t *, int);
+ssize_t rfc822_write_address_single(char *, ssize_t, address_t *, int);
+ssize_t rfc822_strcpy(char *, ssize_t, const char *, const char *);