Those aren't used in either fprintd or BSD's login_fingerprint
fprintd has a version that saves to local file storage. I believe only a couple of functions to help with making the filenames/storage paths unique would be useful, either as code or documentation.
Author: Bastien Nocera <firstname.lastname@example.org>
Date: Thu May 24 13:21:40 2018 +0200
data: Mark all the fp_dscv_print functions as deprecated
As this is pretty much copy/pasted in fprintd, and should instead be
implemented by whatever system actually stores the data, rather than
in a generic but not quite "fits-all-purpose" way.