XmStringGetNextTriple(3) on Linux
The text 192c2178788f, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
An XmString function that returns the type, length, and value of the next component in the compound string "XmStringGetNextTriple"