XmTextFieldGetMaxLength(3) on Linux
The text b7346e60cf4c, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
A TextField function that accesses the value of the current maximum allowable length of a text string entered from the keyboard "XmTextFieldGetMaxLength" "TextField functions" "XmTextFieldGetMaxLength"