* Note: uci_lookup_ptr will automatically load a config package if necessary
* @str must not be constant, as it will be modified and used for the strings inside @ptr,
* thus it must also be available as long as @ptr is in use.
+ *
+ * This function returns UCI_ERR_NOTFOUND if the package specified in the tuple
+ * string cannot be found. Otherwise it will return UCI_OK.
+ *
+ * Note that failures in looking up other parts, if they are also specfied,
+ * including section and option, will also have a return value UCI_OK but with
+ * ptr->flags * UCI_LOOKUP_COMPLETE not set.
*/
extern int uci_lookup_ptr(struct uci_context *ctx, struct uci_ptr *ptr, char *str, bool extended);