https://manpages.ubuntu.com/manpages/xenial/man3/XmTextGetSubstringWcs.3.html
Ubuntu Manpage: XmTextGetSubstringWcs - A Text function that retrieves a portion of a wide...
A Text function that retrieves a portion of a wide character internal text buffer "XmTextGetSubstringWcs" "Text functions" "XmTextGetSubstringWcs"
text functionubuntumanpage