texinfo/doc/epsf.tex

%%% -*-TeX-*-
%%% ====================================================================
%%%  @TeX-file{
%%%     author          = "Tom Rokicki",
%%%     version         = "2.7.4",
%%%     date            = "14 February 2011",
%%%     time            = "15:44:06 MST",
%%%     filename        = "epsf.tex",
%%%     address         = "Tom Rokicki
%%%                        Box 2081
%%%                        Stanford, CA 94309
%%%                        USA",
%%%     telephone       = "+1 415 855 9989",
%%%     checksum        = "29223 653 3100 27123",
%%%     email           = "rokicki@cs.stanford.edu (Internet)",
%%%     codetable       = "ISO/ASCII",
%%%     copyright       = "This file is freely redistributable and
%%%                        placed into the public domain by Tomas
%%%                        Rokicki.",
%%%     keywords        = "PostScript, TeX",
%%%     license         = "public domain",
%%%     supported       = "yes",
%%%     abstract        = "This file contains macros to support the
%%%                        inclusion of Encapsulated PostScript files
%%%                        in TeX documents.",
%%%     docstring       = "This file contains TeX macros to include an
%%%                        Encapsulated PostScript graphic.  It works
%%%                        by finding the bounding box comment,
%%%                        calculating the correct scale values, and
%%%                        inserting a vbox of the appropriate size at
%%%                        the current position in the TeX document.
%%%
%%%                        To use, simply use
%%%
%%%                        \input epsf % somewhere early on in your TeX file
%%%
%%%                        % then where you want to insert a vbox for a figure:
%%%                        \epsfbox{filename.ps}
%%%
%%%                        Alternatively, you can supply your own
%%%                        bounding box by
%%%
%%%                        \epsfbox[0 0 30 50]{filename.ps}
%%%
%%%                        This will not read in the file, and will
%%%                        instead use the bounding box you specify.
%%%
%%%                        The effect will be to typeset the figure as
%%%                        a TeX box, at the point of your \epsfbox
%%%                        command. By default, the graphic will have
%%%                        its `natural' width (namely the width of
%%%                        its bounding box, as described in
%%%                        filename.ps). The TeX box will have depth
%%%                        zero.
%%%
%%%                        You can enlarge or reduce the figure by
%%%                        using
%%%
%%%                          \epsfxsize = <dimen> \epsfbox{filename.ps}
%%%                        or
%%%                          \epsfysize = <dimen> \epsfbox{filename.ps}
%%%
%%%                        instead. Then the width of the TeX box will
%%%                        be \epsfxsize and its height will be scaled
%%%                        proportionately (or the height will be
%%%                        \epsfysize and its width will be scaled
%%%                        proportionately).
%%%
%%%                        The width (and height) is restored to zero
%%%                        after each use, so \epsfxsize or \epsfysize
%%%                        must be specified before EACH use of
%%%                        \epsfbox.
%%%
%%%                        A more general facility for sizing is
%%%                        available by defining the \epsfsize macro.
%%%                        Normally you can redefine this macro to do
%%%                        almost anything.  The first parameter is
%%%                        the natural x size of the PostScript
%%%                        graphic, the second parameter is the
%%%                        natural y size of the PostScript graphic.
%%%                        It must return the xsize to use, or 0 if
%%%                        natural scaling is to be used.  Common uses
%%%                        include:
%%%
%%%                           \epsfxsize  % just leave the old value alone
%%%                           0pt         % use the natural sizes
%%%                           #1          % use the natural sizes
%%%                           \hsize      % scale to full width
%%%                           0.5#1       % scale to 50% of natural size
%%%                           \ifnum #1 > \hsize \hsize \else #1\fi
%%%                                       % smaller of natural, hsize
%%%
%%%                        If you want TeX to report the size of the
%%%                        figure (as a message on your terminal when
%%%                        it processes each figure), use
%%%                        `\epsfverbosetrue'.
%%%
%%%                        If you only want to get the bounding box
%%%                        extents, without producing any output boxes
%%%                        or \special{}, then use \epsfgetbb{filename}.
%%%                        The bounding box corner coordinates are saved
%%%                        in the macros \epsfllx, \epsflly, \epsfurx,
%%%                        and \epsfury in PostScript units of big
%%%                        points.
%%%
%%%                        Revision history:
%%%
%%%                        ---------------------------------------------
%%%                        epsf.tex macro file:
%%%                        Originally written by Tomas Rokicki of
%%%                        Radical Eye Software, 29 Mar 1989.
%%%
%%%                        ---------------------------------------------
%%%                        Revised by Don Knuth, 3 Jan 1990.
%%%
%%%                        ---------------------------------------------
%%%                        Revised by Tomas Rokicki, 18 Jul 1990.
%%%                        Accept bounding boxes with no space after
%%%                        the colon.
%%%
%%%                        ---------------------------------------------
%%%                        Revised by Nelson H. F. Beebe
%%%                        <beebe@math.utah.edu>, 03 Dec 1991 [2.0].
%%%                        Add version number and date typeout.
%%%
%%%                        Use \immediate\write16 instead of \message
%%%                        to ensure output on new line.
%%%
%%%                        Handle nested EPS files.
%%%
%%%                        Handle %%BoundingBox: (atend) lines.
%%%
%%%                        Do not quit when blank lines are found.
%%%
%%%                        Add a few percents to remove generation of
%%%                        spurious blank space.
%%%
%%%                        Move \special output to
%%%                        \epsfspecial{filename} so that other macro
%%%                        packages can input this one, then change
%%%                        the definition of \epsfspecial to match
%%%                        another DVI driver.
%%%
%%%                        Move size computation to \epsfsetsize which
%%%                        can be called by the user; the verbose
%%%                        output of the bounding box and scaled width
%%%                        and height happens here.
%%%
%%%                        ---------------------------------------------
%%%                        Revised by Nelson H. F. Beebe
%%%                        <beebe@math.utah.edu>, 05 May 1992 [2.1].
%%%                        Wrap \leavevmode\hbox{} around \vbox{} with
%%%                        the \special so that \epsffile{} can be
%%%                        used inside \begin{center}...\end{center}
%%%
%%%                        ---------------------------------------------
%%%                        Revised by Nelson H. F. Beebe
%%%                        <beebe@math.utah.edu>, 09 Dec 1992 [2.2].
%%%                        Introduce \epsfshow{true,false} and
%%%                        \epsfframe{true,false} macros; the latter
%%%                        suppresses the insertion of the PostScript,
%%%                        and instead just creates an empty box,
%%%                        which may be handy for rapid prototyping.
%%%
%%%                        ---------------------------------------------
%%%                        Revised by Nelson H. F. Beebe
%%%                        <beebe@math.utah.edu>, 14 Dec 1992 [2.3].
%%%                        Add \epsfshowfilename{true,false}.  When
%%%                        true, and \epsfshowfalse is specified, the
%%%                        PostScript file name will be displayed
%%%                        centered in the figure box.
%%%
%%%                        ---------------------------------------------
%%%                        Revised by Nelson H. F. Beebe
%%%                        <beebe@math.utah.edu>, 20 June 1993 [2.4].
%%%                        Remove non-zero debug setting of \epsfframemargin,
%%%                        and change margin handling to preserve EPS image
%%%                        size and aspect ratio, so that the actual
%%%                        box is \epsfxsize+\epsfframemargin wide by
%%%                        \epsfysize+\epsfframemargin high.
%%%                        Reduce output of \epsfshowfilenametrue to
%%%                        just the bare file name.
%%%
%%%                        ---------------------------------------------
%%%                        Revised by Nelson H. F. Beebe
%%%                        <beebe@math.utah.edu>, 13 July 1993 [2.5].
%%%                        Add \epsfframethickness for control of
%%%                        \epsfframe frame lines.
%%%
%%%                        ---------------------------------------------
%%%                        Revised by Nelson H. F. Beebe
%%%                        <beebe@math.utah.edu>, 02 July 1996 [2.6]
%%%                        Add missing initialization \epsfatendfalse;
%%%                        the lack of this resulted in the wrong
%%%                        BoundingBox being picked up, mea culpa, sigh...
%%%
%%%                        ---------------------------------------------
%%%                        Revised by Nelson H. F. Beebe
%%%                        <beebe@math.utah.edu>, 25 October 1996 [2.7]
%%%                        Update to match changes in from dvips 5-600
%%%                        distribution: new user-accessible macros:
%%%                        \epsfclipon, \epsfclipoff, \epsfdrafton,
%%%                        \epsfdraftoff, change \empty to \epsfempty.
%%%
%%%                        ---------------------------------------------
%%%                        Revised by Nelson H. F. Beebe
%%%                        <beebe@math.utah.edu>, 18 May 2002 [2.7.1]
%%%                        Add write statements to echo input file
%%%                        names.  Prior to that change, an error in
%%%                        such a file could be quite hard to track
%%%                        down: a long list of TeX page numbers could
%%%                        suddenly be followed by ``TeX buffer
%%%                        capacity'' exceeded, without any indication
%%%                        of the file that was responsible.
%%%
%%%                        ---------------------------------------------
%%%                        Revised by Nelson H. F. Beebe
%%%                        <beebe@math.utah.edu>, 16 May 2003 [2.7.2]
%%%                        Supply two critical percent characters that
%%%                        were mistakenly omitted in version 2.7.1,
%%%                        and resulted in a small amount of spurious
%%%                        horizontal space.
%%%
%%%                        ---------------------------------------------
%%%                        Revised by Nelson H. F. Beebe
%%%                        <beebe@math.utah.edu>, 14 Feb 2011 [2.7.3]
%%%                        Add previously-missing \space in rwi
%%%                        assignments (bug reported 14-Feb-2011 by
%%%                        Stefan Rueger <s.rueger@open.ac.uk>).
%%%
%%%                        ---------------------------------------------
%%%                        Revised by Nelson H. F. Beebe
%%%                        <beebe@math.utah.edu>, Karl Berry
%%%                        <karl@freefriends.org>, and Robin Fairbairns
%%%                        <Robin.Fairbairns@cl.cam.ac.uk>,
%%%                        23 July 2005 [2.7.3]
%%%                        Add critical \hbox{} wrapper in \epsfsetgraph
%%%                        so that \epsfbox{} does not conflict with
%%%                        LaTeX center environment when \epsfbox{} is
%%%                        surrounded by other horizonal objects.
%%%                        Improve macro readability by adding legal,
%%%                        but invisible-in-typeset-output, spaces.
%%%                        Ensure that verbose status reports come
%%%                        inside (filename ...) list.
%%%
%%%                        ---------------------------------------------
%%%                        The checksum field above contains a CRC-16
%%%                        checksum as the first value, followed by
%%%                        the equivalent of the standard UNIX wc
%%%                        (word count) utility output of lines,
%%%                        words, and characters.  This is produced by
%%%                        Robert Solovay's checksum utility.",
%%%  }
%%% ====================================================================

%\immediate \write16 {This is `epsf.tex' v2.0 <02 Dec 1991>}%
%\immediate \write16 {This is `epsf.tex' v2.1 <05 May 1992>}%
%\immediate \write16 {This is `epsf.tex' v2.2 <09 Dec 1992>}%
%\immediate \write16 {This is `epsf.tex' v2.3 <14 Dec 1992>}%
%\immediate \write16 {This is `epsf.tex' v2.4 <20 June 1993>}%
%\immediate \write16 {This is `epsf.tex' v2.5 <13 July 1993>}%
%\immediate \write16 {This is `epsf.tex' v2.6 <02 July 1996>}%
%\immediate \write16 {This is `epsf.tex' v2.7 <25 October 1996>}%
%\immediate \write16 {This is `epsf.tex' v2.7.1 <18 May 2002>}%
%\immediate \write16 {This is `epsf.tex' v2.7.2 <16 May 2003>}%
%\immediate \write16 {This is `epsf.tex' v2.7.3 <23 July 2005>}%
\immediate \write16 {This is `epsf.tex' v2.7.4 <14 February 2011>}%
%
\newread \epsffilein    % file to \read
\newif \ifepsfatend     % need to scan to LAST %%BoundingBox comment?
\newif \ifepsfbbfound   % success?
\newif \ifepsfdraft     % use draft mode?
\newif \ifepsffileok    % continue looking for the bounding box?
\newif \ifepsfframe     % frame the bounding box?
\newif \ifepsfshow      % show PostScript file, or just bounding box?
\epsfshowtrue          % default is to display PostScript file
\newif \ifepsfshowfilename % show the file name if \epsfshowfalse specified?
\newif \ifepsfverbose   % report what you're making?
\newdimen \epsfframemargin % margin between box and frame
\newdimen \epsfframethickness % thickness of frame rules
\newdimen \epsfrsize    % vertical size before scaling
\newdimen \epsftmp      % register for arithmetic manipulation
\newdimen \epsftsize    % horizontal size before scaling
\newdimen \epsfxsize    % horizontal size after scaling
\newdimen \epsfysize    % vertical size after scaling
\newdimen \pspoints     % conversion factor
%
\pspoints = 1bp        % Adobe points are `big'
\epsfxsize = 0pt       % default value, means `use natural size'
\epsfysize = 0pt       % ditto
\epsfframemargin = 0pt % default value: frame box flush around picture
\epsfframethickness = 0.4pt % TeX's default rule thickness
%
\def \epsfbox #1{%
    \global \def \epsfllx {72}%
    \global \def \epsflly {72}%
    \global \def \epsfurx {540}%
    \global \def \epsfury {720}%
    \def \lbracket {[}%
    \def \testit {#1}%
    \ifx \testit \lbracket
        \let \next = \epsfgetlitbb
    \else
        \let \next = \epsfnormal
    \fi
    \next{#1}%
}%
%
% We use \epsfgetlitbb if the user specified an explicit bounding box,
% and \epsfnormal otherwise.  Because \epsfgetbb can be called
% separately to retrieve the bounding box, we move the verbose
% printing the bounding box extents and size on the terminal to
% \epsfstatus.  Therefore, when the user provided the bounding box,
% \epsfgetbb will not be called, so we must call \epsfsetsize and
% \epsfstatus ourselves.
%
\def \epsfgetlitbb #1#2 #3 #4 #5]#6{%
   \epsfgrab #2 #3 #4 #5 .\\%
   \epsfsetsize
   \epsfstatus{#6}%
   \epsfsetgraph{#6}%
}%
%
\def \epsfnormal #1{%
    \epsfgetbb{#1}%
    \epsfsetgraph{#1}%
}%
%
\def \epsfgetbb #1{%
%
%   The first thing we need to do is to open the
%   PostScript file, if possible.
%
    \openin\epsffilein=#1
    \immediate \write16 {(#1}%
    \ifeof \epsffilein
        \errmessage{Could not open file #1, ignoring it}%
    \else                       %process the file
        {%                      %start a group to contain catcode changes
            % Make all special characters, except space, to be of type
            % `other' so we process the file in almost verbatim mode
            % (TeXbook, p. 344).
            \chardef \other = 12%
            \def \do ##1{\catcode`##1=\other}%
            \dospecials
            \catcode `\ = 10%
            \epsffileoktrue        %true while we are looping
            \epsfatendfalse        %[02-Jul-1996]: add forgotten initialization
            \loop                  %reading lines from the EPS file
                \read \epsffilein to \epsffileline
                \ifeof \epsffilein %then no more input
                \epsffileokfalse   %so set completion flag
            \else                  %otherwise process one line
                \expandafter \epsfaux \epsffileline :. \\%
            \fi
            \ifepsffileok
            \repeat
            \ifepsfbbfound
            \else
                \ifepsfverbose
                    \immediate \write16 {No BoundingBox comment found in %
                                         file #1; using defaults}%
                \fi
            \fi
        }%                      %end catcode changes
        \closein\epsffilein
    \fi                         %end of file processing
    \epsfsetsize                %compute size parameters
    \epsfstatus{#1}%
    \immediate \write16 {)}%
}%
%
% Clipping control:
\def \epsfclipon  {\def \epsfclipstring { clip}}%
\def \epsfclipoff {\def \epsfclipstring {\ifepsfdraft \space clip\fi}}%
\epsfclipoff % default for dvips is OFF
%
% The special that is emitted by \epsfsetgraph comes from this macro.
% It is defined separately to allow easy customization by other
% packages that first \input epsf.tex, then redefine \epsfspecial.
% This macro is invoked in the lower-left corner of a box of the
% width and height determined from the arguments to \epsffile, or
% from the %%BoundingBox in the EPS file itself.
%
% This version is for dvips:
\def \epsfspecial #1{%
     \epsftmp=10\epsfxsize
     \divide \epsftmp by \pspoints
     \ifnum \epsfrsize = 0%
       \relax
       \special{PSfile=\ifepsfdraft psdraft.ps\else#1\fi\space
		llx=\epsfllx\space
		lly=\epsflly\space
		urx=\epsfurx\space
		ury=\epsfury\space
		rwi=\number\epsftmp\space
		\epsfclipstring
               }%
     \else
       \epsfrsize=10\epsfysize
       \divide \epsfrsize by \pspoints
       \special{PSfile=\ifepsfdraft psdraft.ps\else#1\fi\space
		llx=\epsfllx\space
		lly=\epsflly\space
		urx=\epsfurx\space
		ury=\epsfury\space
		rwi=\number\epsftmp\space
		rhi=\number\epsfrsize
		\epsfclipstring
               }%
     \fi
}%
%
% \epsfframe macro adapted from the TeXbook, exercise 21.3, p. 223, 331.
% but modified to set the box width to the natural width, rather
% than the line width, and to include space for margins and rules
\def \epsfframe #1%
{%
 % method for detecting latex suggested by Robin Fairbairns, May 2005.
  \ifx \documentstyle \epsfundefined
    \relax
  \else
%    \leavevmode                   % so we can put this inside
                                  % a latex centered environment
    % The \leavevmode breaks under plain when this is inside a box,
    % because it forces the figure to be the entire \hsize.  On the
    % other hand, we need the \leavevmode for it to work in LaTeX,
    % because the {center} environment works by adjusting TeX's
    % paragraph parameters.
    %
    % Compare the LaTeX sequence
    % \begin{center}
    %   \epsfbox{tip.eps}q
    % \end{center}
    % (needs the \leavevmode to put the q right next to the image)
    %
    % with the plain TeX sequence:
    % \leftline{\vbox{\epsfbox{tip.eps}}q}
    % (had the q all the way over to the right, when \leavevmode was used)
  \fi
  %
  \setbox0 = \hbox{#1}%
  \dimen0 = \wd0                                % natural width of argument
  \advance \dimen0 by 2\epsfframemargin         % plus width of 2 margins
  \advance \dimen0 by 2\epsfframethickness      % plus width of 2 rule lines
  \relax
  \hbox{%
    \vbox
    {%
      \hrule height \epsfframethickness depth 0pt
      \hbox to \dimen0
      {%
	\hss
	\vrule width \epsfframethickness
	\kern \epsfframemargin
	\vbox {\kern \epsfframemargin \box0 \kern \epsfframemargin }%
	\kern \epsfframemargin
	\vrule width \epsfframethickness
	\hss
      }% end hbox
      \hrule height 0pt depth \epsfframethickness
    }% end vbox
  }% end hbox
  \relax
}%
%
\def \epsfsetgraph #1%
{%
   %
   % Make the vbox and stick in a \special that the DVI driver can
   % parse.  \vfil and \hfil are used to place the \special origin at
   % the lower-left corner of the vbox.  \epsfspecial can be redefined
   % to produce alternate \special syntaxes.
   %
   \ifvmode \leavevmode \fi
   \relax
   \hbox{% so we can put this in \begin{center}...\end{center}
     \ifepsfframe \expandafter \epsfframe \fi
     {\vbox to\epsfysize
     {%
        \ifepsfshow
            % output \special{} at lower-left corner of figure box
            \vfil
            \hbox to \epsfxsize{\epsfspecial{#1}\hfil}%
        \else
            \vfil
            \hbox to\epsfxsize{%
               \hss
               \ifepsfshowfilename
               {%
                  \epsfframemargin=3pt % local change of margin
                  \epsfframe{{\tt #1}}%
               }%
               \fi
               \hss
            }%
            \vfil
        \fi
     }%
   }}%
   \relax
   %
   % Reset \epsfxsize and \epsfysize, as documented above.
   %
   \global \epsfxsize = 0pt
   \global \epsfysize = 0pt
}%
%
%   Now we have to calculate the scale and offset values to use.
%   First we compute the natural sizes.
%
\def \epsfsetsize
{%
   \epsfrsize = \epsfury \pspoints
   \advance \epsfrsize by -\epsflly \pspoints
   \epsftsize = \epsfurx \pspoints
   \advance \epsftsize by -\epsfllx \pspoints
%
%   If `epsfxsize' is 0, we default to the natural size of the picture.
%   Otherwise we scale the graph to be \epsfxsize wide.
%
   \epsfxsize = \epsfsize{\epsftsize}{\epsfrsize}%
   \ifnum \epsfxsize = 0
      \ifnum \epsfysize = 0
	\epsfxsize = \epsftsize
        \epsfysize = \epsfrsize
	\epsfrsize = 0pt
%
%   We have a sticky problem here:  TeX doesn't do floating point arithmetic!
%   Our goal is to compute y = rx/t. The following loop does this reasonably
%   fast, with an error of at most about 16 sp (about 1/4000 pt).
%
      \else
	\epsftmp = \epsftsize
        \divide \epsftmp by \epsfrsize
	\epsfxsize = \epsfysize
        \multiply \epsfxsize by \epsftmp
	\multiply \epsftmp by \epsfrsize
        \advance \epsftsize by -\epsftmp
	\epsftmp = \epsfysize
	\loop
        \advance \epsftsize by \epsftsize
        \divide \epsftmp by 2
	\ifnum \epsftmp > 0
	   \ifnum \epsftsize < \epsfrsize
           \else
	      \advance \epsftsize -\epsfrsize
              \advance \epsfxsize \epsftmp
           \fi
	\repeat
	\epsfrsize = 0pt
      \fi
   \else
     \ifnum \epsfysize = 0
       \epsftmp = \epsfrsize
       \divide \epsftmp by \epsftsize
       \epsfysize = \epsfxsize
       \multiply \epsfysize by \epsftmp
       \multiply \epsftmp by \epsftsize
       \advance \epsfrsize by -\epsftmp
       \epsftmp = \epsfxsize
       \loop
	 \advance \epsfrsize by \epsfrsize
	 \divide \epsftmp by 2
       \ifnum \epsftmp > 0
	  \ifnum \epsfrsize < \epsftsize
          \else
	     \advance \epsfrsize by -\epsftsize
             \advance \epsfysize by \epsftmp
          \fi
       \repeat
       \epsfrsize = 0pt
     \else
       \epsfrsize = \epsfysize
     \fi
   \fi
}%
%
% Issue some status messages if the user requested them
%
\def \epsfstatus #1{% arg = filename
   \ifepsfverbose
     \immediate \write16 {#1: BoundingBox:
			  llx = \epsfllx \space lly = \epsflly \space
			  urx = \epsfurx \space ury = \epsfury \space}%
     \immediate \write16 {#1: scaled width = \the\epsfxsize \space
			  scaled height = \the\epsfysize}%
   \fi
}%
%
%   We still need to define the tricky \epsfaux macro. This requires
%   a couple of magic constants for comparison purposes.
%
{\catcode`\%=12 \global \let \epsfpercent=%\global \def \epsfbblit {%BoundingBox}}%
\global \def \epsfatend{(atend)}%
%
%   So we're ready to check for `%BoundingBox:' and to grab the
%   values if they are found.
%
%   If we find a line
%
%   %%BoundingBox: (atend)
%
%   then we ignore it, but set a flag to force parsing all of the
%   file, so the last %%BoundingBox parsed will be the one used.  This
%   is necessary, because EPS files can themselves contain other EPS
%   files with their own %%BoundingBox comments.
%
%   If we find a line
%
%   %%BoundingBox: llx lly urx ury
%
%   then we save the 4 values in \epsfllx, \epsflly, \epsfurx, \epsfury.
%   Then, if we have not previously parsed an (atend), we flag completion
%   and can stop reading the file.  Otherwise, we must keep on reading
%   to end of file so that we find the values on the LAST %%BoundingBox.
\long \def \epsfaux#1#2:#3\\%
{%
   \def \testit {#2}%           % save second character up to just before colon
   \ifx#1\epsfpercent           % then first char is percent (quick test)
       \ifx \testit \epsfbblit  % then (slow test) we have %%BoundingBox
            \epsfgrab #3 . . . \\%
            \ifx \epsfllx\epsfatend % then ignore %%BoundingBox: (atend)
                \global \epsfatendtrue
            \else               % else found %%BoundingBox: llx lly urx ury
                \ifepsfatend    % then keep parsing ALL %%BoundingBox lines
                \else           % else stop after first one parsed
                    \epsffileokfalse
                \fi
                \global \epsfbbfoundtrue
            \fi
       \fi
   \fi
}%
%
%   Here we grab the values and stuff them in the appropriate definitions.
%
\def \epsfempty {}%
\def \epsfgrab #1 #2 #3 #4 #5\\{%
   \global \def \epsfllx {#1}\ifx \epsfllx\epsfempty
      \epsfgrab #2 #3 #4 #5 .\\\else
   \global \def \epsflly {#2}%
   \global \def \epsfurx {#3}\global \def \epsfury {#4}\fi
}%
%
%   We default the epsfsize macro.
%
\def \epsfsize #1#2{\epsfxsize}%
%
%   Finally, another definition for compatibility with older macros.
%
\let \epsffile = \epsfbox
\endinput