XmDataFieldGetStringWcs(3) on Linux
The text 15c4c44296aa, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
A DataField function that retrieves a copy of the wide character string value of a DataField widget "XmDataFieldGetStringWcs" "DataField functions" "XmDataFieldGetStringWcs"