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+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% CD labeling macros, version 0.93, unreleased
+% Copyright Victor Eijkhout 2001
+% file name: CD_labeler.tex
+% uses: repeat.tex
+%
+% Author:
+% Victor Eijkhout
+% Department of Computer Science
+% University of Tennessee, Knoxville TN 37996
+%
+% victor@eijkhout.net
+%
+% This program is free software; you can redistribute it and/or
+% modify it under the terms of the GNU General Public License
+% as published by the Free Software Foundation; either version 2
+% of the License, or (at your option) any later version.
+% 
+% This program is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+% GNU General Public License for more details.
+%
+% For a copy of the GNU General Public License, write to the 
+% Free Software Foundation, Inc.,
+% 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA,
+% or find it on the net, for instance at
+% http://www.gnu.org/copyleft/gpl.html
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% Use this file as follows:
+%
+% \input CD_labeler
+% \CDLlabel{ <label content> }
+%
+% where the <label content> is usually comprised of
+% one or more of the following:
+% 
+% \CDLbackground{ <picture material> }
+% \CDLunderhole{<setup>}{ <material printed below the hole> }
+% \CDLlowerhalf{<setup>}{ <material on the lower half of the label,
+%                 left of and below the hole> }
+% \CDLleft{<setup>}{ <material printed on the left side of the label> }
+% \CDLright{<setup>}{ <material printed on the right side of the label> }
+%
+% (You can insert your own material, which gets processed in
+% horizontal mode. However, you'll have a hard time controlling
+% its elevation in the label.)
+%
+% These commands can be given in any order, since basically
+% everything is printed on top of each other.
+%
+% Make sure to put %-signs at line ends:
+% \CDLlabel{%
+%     \CDLbackground{<stuff>}%
+%     \CDLleft{<text>}%
+% }
+%
+% The <setup> material contains such things as \baselineskip
+% settings. If you use a non-standard baselineskip, it is
+% *essential* that you put that declaration in the first 
+% argument. Things such as font choices can go in the second.
+%
+% With the material left and right of the label, you may want to
+% leave a few lines blank at the top. Here's how:
+% To leave some blank lines: \CDLblank{ <number of lines to skip> }
+%
+% For guidance, a box is printed around the label. You can suppress
+% this by \CDLboxfalse.
+%
+% Adjustable dimensions:
+% \CDLdiscsize (default 120mm, which is CD size)
+% \CDLinnerdiameter (default 40mm, the hole and ring around it)
+% \CDLedgemargin (default 4mm, stay away this much from the edge)
+% \CDLgutterwidth (default 0mm, keep this much space between
+%                  \CDLleft and \CDLright text)
+%
+% Auxiliary commands:
+% \CDLraggedright suppress hyphenation and use ragged right margin
+%
+% If you also use my DB_process macros, you can do things like
+%
+% \CDLlabel{%
+%   \CDLunderhole{\baselineskip8pt}{\smallfont \DBPtabfile{cd_file}}%
+%   \CDLleft{\baselineskip22pt \rightskip0pt plus 1cm}%
+%           {\CDLblank{3}\titlefont My favourite bedtime songs}%
+%   \CDLright{\baselineskip8pt}{\CDLblank{7}\smallfont
+%             \leftskip=1cm \rightskip=0pt plus 1cm
+%             Compiled for his own
+%             private use, by Victor Eijkhout, 1998}}
+% where the cd_file is dumped from your favourite database.
+%
+% Share and enjoy!
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% revision history:
+% 0.9 first release, December 1998
+% 0.91 fixed documentation, use repeat.tex for loop macro,
+%      copyright notice, bug in lower half macro, Feb 1999
+% 0.92 \CDLlabel made \long
+%      \CDLinnerradius changed to \CDLinnerdiameter
+%      fixed double subtracting of offset in \CDL{left,right},
+%      and added empty line, suggestions by Yotam Medini. April 1999
+% 0.93 added \CDLragged{left,right} \CDLgutterwidth \CDLsquash.
+%      Major improvement in \CDL{left,right}. February 2001.
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+%%
+%% Prevent multiple loading of this file
+%%
+\expandafter\ifx\csname CDLcount\endcsname\relax
+  \message{Loading CD labeler, version 0.92}%
+\else
+  \message{CD labeling macros already loaded ... }\endinput \fi
+
+\newtoks\CDLtoks \newbox\CDLbox
+\newdimen\CDLdiscsize \CDLdiscsize=120mm
+\newdimen\CDLinnerdiameter \CDLinnerdiameter=40mm
+\newdimen\CDLedgemargin \CDLedgemargin=4mm
+\newdimen\CDLgutterwidth \CDLgutterwidth=0mm
+\newif\ifCDLbox \CDLboxtrue
+
+%%
+%% Load auxiliary files: loop macro
+%%
+\input repeat.tex
+
+%%
+%% CDLlabel
+%% main routine, this draws an empty box, with any
+%% background and content supplied by the user
+%% in \CDLbackground and \CDL{left,right,underhole,overhole}
+%%
+\long\def\CDLlabel#1%
+   {\vbox{\ifCDLbox\hrule\fi
+          \hbox to \CDLdiscsize
+             {\hsize=\CDLdiscsize \ifCDLbox\vrule\fi
+              \ignorespaces #1\hss \ifCDLbox\vrule\fi}
+          \ifCDLbox\hrule\fi}}
+%%
+%% CDLbackground
+%% user macro
+%% place a dimensionless item, presumably a picture
+%%
+\def\CDLbackground#1{
+    \setbox\CDLbox=\vbox to 0pt{\hsize=0pt
+                 \hbadness\maxdimen \vbadness\maxdimen #1}%
+    \wd\CDLbox=0pt \raise \CDLdiscsize\box\CDLbox}
+%%
+%% CDLlabelbox
+%% basic macro for shape macros below
+%%
+\long\def\CDLlabelbox#1{%
+    \setbox\CDLbox=\vbox to \CDLdiscsize{\hsize=\CDLdiscsize
+        \hrule width \CDLdiscsize height 0pt depth 0pt \nointerlineskip
+        \vskip\CDLedgemargin
+        #1\vfil
+        }%
+    \wd\CDLbox=0pt \box\CDLbox \ignorespaces}
+
+%%
+%% Shapes macros: various loops of calling CDLline, and building
+%% up a \parshape. This is built around CDLline, which computes 
+%% length and indents left/right of a line somewhere on the label.
+%% #1 is an option for setup: baselineskip and such
+%%
+\def\CDLlowerhalf#1#2{\CDLlabelbox{#1\relax
+  \vskip.5\CDLdiscsize
+  \CDLtoks={}%
+  \begingroup
+    \repeat \for{CDLcount} \from{0} \do {%
+      \count1=\CDLcount \advance\count1 by 1
+      \CDLline{\count1}\a\t\c
+      \CDLline\CDLcount\t\b\t
+      \if\CDLerror \expandafter\breakrepeat \fi
+          \dimen1=\c\relax \dimen2=\a\relax
+          \ifdim\b=0pt \multiply\dimen2 by 2 \fi
+          \edef\temp{\global\CDLtoks={\the\CDLtoks 
+               \space\the\dimen1 \space\the\dimen2}}\temp
+      }%
+    \noindent \parshape \CDLcount \the\CDLtoks #2\par
+  \endgroup
+  }}
+\def\CDLunderhole#1#2{\CDLlabelbox{#1\relax
+  \vskip.5\CDLdiscsize \vskip.5\CDLinnerdiameter \vskip\baselineskip
+  \CDLtoks={}%
+  \begingroup
+    \count0=0
+    \repeat \for{CDLcount} \from{0} \do {%
+      \count1=\CDLcount \advance\count1 by 1
+      \CDLline{\count1}\a\t\c
+      \CDLline\CDLcount\t\b\t
+      \if\CDLerror \expandafter\breakrepeat \fi
+          \ifdim\b>0pt \advance\count0 by 1
+          \else \dimen1=\c\relax \dimen2=\a\relax
+              \multiply\dimen2 by 2
+              \edef\temp{\global\CDLtoks={\the\CDLtoks 
+                   \space\the\dimen1 \space\the\dimen2}}\temp
+          \fi
+      }%
+    \advance\CDLcount by -\count0
+    \noindent \parshape \CDLcount \the\CDLtoks #2\par
+  \endgroup 
+  }}
+\def\CDLleft#1#2{\CDLlabelbox{
+  \CDLtoks={}#1\relax
+  \begingroup
+    \repeat \for{CDLcount} \from{0} \do {%
+      \CDLline\CDLcount\a\b\c
+      \if\CDLerror \expandafter\breakrepeat \fi
+      % if we're not next to the hole, leave a gutter
+      \ifdim\b=0pt \dimen0=\a \advance\dimen0 by -\CDLgutterwidth
+        \edef\a{\the\dimen0 }\fi
+      \edef\temp{\CDLtoks={\c\space\a \space\the\CDLtoks \space \c\space\a}}\temp
+      }%
+    \noindent
+    \multiply\CDLcount by 2 \advance\CDLcount by 1
+    \parshape \CDLcount 0pt 0pt \the\CDLtoks \hfill\break #2\par
+  \endgroup 
+  }}
+\def\CDLright#1#2{\CDLlabelbox{
+  \CDLtoks={}#1\relax
+  \begingroup
+    %\count0=\CDLdiscsize \divide\count0 by \baselineskip
+    %\message{Should fit \the\count0 lines}%
+    \repeat \for{CDLcount} \from{0} \do {%
+      % get \a=length \b=inner gap \c=outer gap
+      \CDLline\CDLcount\a\b\c
+      \if\CDLerror \expandafter\breakrepeat \fi
+      % if we're not next to the hole, leave a gutter
+      \ifdim\b=0pt \dimen0=\a \advance\dimen0 by -\CDLgutterwidth
+          \edef\a{\the\dimen0 }%
+        \else
+          \dimen0=\a \advance\dimen0 by -\baselineskip \edef\a{\the\dimen0 }%
+          \dimen0=\b \advance\dimen0 by \baselineskip \edef\b{\the\dimen0 }%
+        \fi
+      \dimen0=\CDLdiscsize \divide\dimen0 by 2
+      \advance\dimen0 by \b
+      \edef\temp{\CDLtoks={
+               \the\dimen0 \space\a \space\the\CDLtoks
+               \the\dimen0 \space\a}}\temp
+      }%
+    \noindent \multiply\CDLcount by 2 \advance\CDLcount by 1
+    \parshape \CDLcount 0pt 0pt \the\CDLtoks \hfill\break #2\par
+  \endgroup 
+  }}
+\def\CDLleftandunder#1#2{\CDLlabelbox{
+  \CDLtoks={}#1\relax
+  \begingroup
+    \repeat \for{CDLcount} \from{1} \do {%
+      % get \a=length \b=inner gap \c=outer gap
+      \CDLline\CDLcount\a\b\c
+      \if\CDLerror \expandafter\breakrepeat \fi
+      % if we're not next to the hole, leave a gutter
+      \ifdim\b=0pt \dimen0=\a \advance\dimen0 by -\CDLgutterwidth
+        \edef\a{\the\dimen0 }\fi
+      \edef\temp{\CDLtoks={\c\space\a \space\the\CDLtoks}}\temp
+      }%
+    \CDLline0\a\b\c
+    \edef\temp{\CDLtoks={\the\CDLtoks \space \c\space\a \space \c\space\a}}\temp
+    \advance\CDLcount by 3
+    \edef\tempc{\the\CDLcount}%
+    \repeat \for{CDLcount} \from{0} \do {%
+      \count1=\CDLcount \advance\count1 by 1
+      \CDLline{\count1}\a\t\c
+      \CDLline\CDLcount\t\b\t
+      \if\CDLerror \expandafter\breakrepeat \fi
+          \dimen1=\c\relax \dimen2=\a\relax
+          \ifdim\b=0pt \multiply\dimen2 by 2 \fi
+          \edef\temp{\global\CDLtoks={\the\CDLtoks 
+               \space\the\dimen1 \space\the\dimen2}}\temp
+      }%
+    \advance\CDLcount by \tempc
+    \noindent
+    \parshape \CDLcount 0pt 0pt \the\CDLtoks \hfill\break #2\par
+  \endgroup 
+  }}
+\def\CDLblank#1{\begingroup\count0=#1\relax
+    \ifnum\count0>0 \hfill\break \advance\count0 by -1
+    \expandafter\CDLblank\expandafter{\number\count0}\fi\endgroup}
+
+%%%%%%%%%%%%%%%% Auxiliaries %%%%%%%%%%%%%%%%
+%%
+%% \CDLraggedright & \CDLraggedleft
+\def\CDLraggedright{\hyphenchar\font=-1
+    \rightskip=0pt plus .5\CDLdiscsize}
+\def\CDLraggedleft{\hyphenchar\font=-1
+    \leftskip=0pt plus .5\CDLdiscsize}
+\def\CDLsquash#1{{\setbox0\hbox{#1}\ht0=0pt \dp0=0pt \box0\relax}}
+
+%%%%%%%%%%%%%%%% Interal macros %%%%%%%%%%%%%%%%
+%%
+%% CDLline
+%% from #1 line number compute #2 length, #3 inner gap #4 outer gap
+%%
+\def\CDLline#1#2#3#4{\CDLsetnoerror
+  \begingroup \dimen0=\baselineskip
+    \multiply\dimen0 by #1\relax
+    \divide\CDLdiscsize by 2 \divide\CDLinnerdiameter by 2
+    \dimen1=\CDLdiscsize \advance\dimen1 by -\CDLedgemargin
+    \CDLcircle{\dimen1}{\dimen0}\blen
+    \if\CDLerror \aftergroup\CDLseterror \else
+        \CDLcircle\CDLinnerdiameter{\dimen0}\slen
+        \dimen0=\blen sp
+        \dimen2=\CDLdiscsize \advance\dimen2 by -\dimen0
+        \xdef#4{\the\dimen2}%
+        \if\CDLerror
+            \xdef#2{\the\dimen0}\gdef#3{0pt}%
+        \else
+            \dimen1=\slen sp\relax \advance\dimen0 by -\dimen1
+            \xdef#2{\the\dimen0}\xdef#3{\the\dimen1}%
+    \fi \fi
+  \endgroup}
+%%
+%% CDLcircle
+%% from #1=r #2=y compute #3=x so that x^2+y^2=r^2
+%%
+\def\CDLcircle#1#2#3{\CDLsetnoerror
+  \begingroup
+    \count2=#1\advance\count2 by #2\edef\a{\number\count2}%
+    \count3=#1\advance\count3 by -#2\edef\b{\number\count3}%
+    \ifnum\count3<0 \aftergroup\CDLseterror \else
+        \CDLsqrt\a\aa \CDLsqrt\b\bb
+        \count0=\aa \multiply\count0 by \bb
+        \xdef#3{\number\count0}%
+    \fi
+  \endgroup}
+%%
+%% CDLsqrt
+%% #1 is dimension, #2 is receiving control sequence
+%%
+\def\CDLsqrt#1#2{\begingroup
+    \count1=#1\relax
+    \repeat \do {
+      \count2=#1\relax \divide\count2 by \count1
+      \advance\count2 by \count1 \divide\count2 by 2
+      \ifnum\count2<\count1 \count1=\count2 
+        \else \expandafter\breakrepeat \fi}
+    \xdef#2{\the\count1}\endgroup}
+
+%%
+%% Error handling
+%%
+\def\CDLsetnoerror{\def\CDLerror{10}}
+\def\CDLseterror{\def\CDLerror{11}}
+
+\endinput
+