https://manpages.ubuntu.com/manpages/xenial/man3/XmTextFieldGetSubstring.3.html
Ubuntu Manpage: XmTextFieldGetSubstring - A TextField function that retrieves a copy of a portion...
A TextField function that retrieves a copy of a portion of the internal text buffer "XmTextFieldGetSubstring" "TextField functions" "XmTextFieldGetSubstring"
copy ofubuntumanpagetextfield