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% File: ifpdf.sty
% Version: 2005/07/22 v1.3
% Author: Heiko Oberdiek
% Email: <oberdiek@uni-freiburg.de>
%
% Copyright: Copyright (C) 2001, 2005 Heiko Oberdiek.
%
% This work may be distributed and/or modified under
% the conditions of the LaTeX Project Public License,
% either version 1.3 of this license or (at your option)
% any later version. The latest version of this license
% is in
% http://www.latex-project.org/lppl.txt
% and version 1.3 or later is part of all distributions
% of LaTeX version 2003/12/01 or later.
%
% This work has the LPPL maintenance status "maintained".
%
% This Current Maintainer of this work is Heiko Oberdiek.
%
% Function: This package looks for pdfTeX in pdf mode and
% implements and sets the switch \ifpdf.
% The detection is based on \pdfoutput and
% the package will not change this value.
% It works with plain or LaTeX formats.
%
% Use: LaTeX: \usepackage{ifpdf}
% plain: \input ifpdf.sty
% The package provides the switch \ifpdf:
% \ifpdf
% ... do things, if pdfTeX is running in pdf mode ...
% \else
% ... other TeX or pdfTeX in dvi mode ...
% \fi
% The package can also be used to set global
% documentclass options:
% \RequirePackage{ifpdf}
% \ifpdf
% \documentclass[pdftex,...]{...}
% \else
% \documentclass[...]{...}
% \fi
%
% Installation:
% CTAN location: CTAN:macros/latex/contrib/oberdiek/ifpdf.sty
% TDS location: TDS:tex/generic/oberdiek/ifpdf.sty
% (Rationale: ifpdf.sty can be used with both plain and
% LaTeX formats.)
%
% History: 2001/06/14 v1.0:
% * first public version,
% 2001/07/14 v1.1:
% * documentation addition: global options
% 2001/09/26 v1.2:
% * documentation typo corrected.
% * version number corrected.
% * line number in log entry removed.
% 2005/07/22 v1.3:
% * Some source code comments from Robin Fairbairns added.
% * Bug fix for negative values of \pdfoutput
% (Oleg Katsitadze)
% * LPPL 1.3
% * Installation section with locations added.
%
% Prevent reloading more than one:
\begingroup
\expandafter\let\expandafter\x\csname ver@ifpdf.sty\endcsname
\ifcase 0%
\ifx\x\relax % plain
\else
\ifx\x\empty % LaTeX
\else
1%
\fi
\fi
\else
\expandafter\ifx\csname PackageInfo\endcsname\relax
\def\x#1#2{%
\immediate\write-1{Package #1 Info: #2.}%
}%
\else
\def\x#1#2{\PackageInfo{#1}{#2, stopped}}%
\fi
\x{ifpdf}{The package is already loaded}%
\endgroup
\expandafter\endinput
\fi
\endgroup
%
% Package identification:
\begingroup
\expandafter\ifx\csname ProvidesPackage\endcsname\relax
\def\x#1#2#3[#4]{\endgroup
\immediate\write-1{Package: #3 #4}%
\xdef#1{#4}%
}%
\else
\def\x#1#2[#3]{\endgroup
#2[#3]%
\ifx#1\relax
\xdef#1{#3}%
\fi
}%
\fi
\expandafter\x\csname ver@ifpdf.sty\endcsname
\ProvidesPackage{ifpdf}%
[2005/07/22 v1.3 %
Providing \expandafter\string\csname ifpdf\endcsname\space (HO)]
%
% Check, whether \ifpdf is already defined:
\begingroup
\expandafter\ifx\csname ifpdf\endcsname\relax
\else
\edef\i/{\expandafter\string\csname ifpdf\endcsname}%
\expandafter\ifx\csname PackageError\endcsname\relax
\def\x#1#2{%
\edef\z{#2}%
\expandafter\errhelp\expandafter{\z}%
\errmessage{Package ifpdf Error: #1}%
}%
\def\y{^^J}%
\newlinechar=10
\else
\def\x#1#2{%
\PackageError{ifpdf}{#1}{#2}%
}%
\def\y{\MessageBreak}%
\fi
\x{Name clash, \i/ is already defined}{%
Incompatible versions of \i/ can cause problems,\y
therefore package loading is aborted.%
}%
\endgroup
\expandafter\endinput
\fi
\endgroup
%
% Implementing the switch:
\newif\ifpdf
% so \pdffalse, initally
\ifx\pdfoutput\undefined
\else
\ifx\pdfoutput\relax
% \pdfoutput was undefined, but someone has used LaTeX internal
% \@ifundefined, or something else involving \csname pdfoutput\endcsname
\else
\ifnum\pdfoutput<1 %
% \pdfoutput=0 or negative, so not generating pdf
\else
\pdftrue
\fi
\fi
\fi
%
% Log comment:
\begingroup
\expandafter\ifx\csname PackageInfo\endcsname\relax
\def\x#1#2{%
\immediate\write-1{Package #1 Info: #2.}%
}%
\else
\let\x\PackageInfo
\expandafter\let\csname on@line\endcsname\empty
\fi
\x{ifpdf}{pdfTeX in pdf mode \ifpdf\else not \fi detected}%
\endgroup
\endinput
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