Description

   The decc$feature_get_name function returns a pointer to a null-
   terminated string containing the name of the feature for the
   entry specified by index. The index value can be 0 to the highest
   allocated feature. If there is no feature corresponding to the
   index value, then the function returns a NULL pointer.

   On error, NULL is returned and errno is set to indicate the
   error.

   See also decc$feature_get, decc$feature_get_index, decc$feature_
   get_value, decc$feature_set, decc$feature_set_value,
   decc$feature_show, and decc$feature_show_all.