* (in the range [1-65535]). Returns less than zero on error. */
int service_name_to_port_number (const char *service_name);
+/** Parse a string to a derive_t value. Returns zero on success or non-zero on
+ * failure. If failure is returned, ret_value is not touched. */
int strtoderive (const char *string, derive_t *ret_value);
#endif /* COMMON_H */