mongoc_database_copy(3) on Linux
The text 656f13bff33b, as Debian 9 (Stretch) shipped it.
Performs a deep copy of the database struct and its configuration. Useful if you intend to call mongoc_database_set_write_concern, mongoc_database_set_read_prefs, or mongoc_database_set_read_concern, and want to preserve an unaltered copy of the struct.