%============Conditionals by Donald Arseneau==========================
%		(as of 27 July'92)
%  \if\blank  --- checks if parameter is blank (Spaces count as blank)
%  \if\given  --- checks if parameter is not blank: like \ifblank\else
%  \if\naught --- checks if parameter is null (spaces are NOT null)
{\catcode`\!=8 % funny catcode so ! will be a delimiter
%
\long\gdef\given#1{\fi\Ifbl@nk#1@@@\empty!}
\long\gdef\blank#1{\fi\Ifbl@nk#1@@..!}% if null or spaces
\long\gdef\naught#1{\IfN@Ught#1* {#1}!}% if null
\long\gdef\Ifbl@nk#1#2@#3#4!{\ifx#3#4}
\long\gdef\IfN@Ught#1 #2!{\blank{#2}}
}
%=====================================================================