Files
Landon Curt Noll a1c86c8a7a add original C links to entry navigation bars
The navigation bar for a winning entry now has a "_Original C_" link
(between the ✅ and the Inventory on the right hand side) so that one
may easily view the original C code that was submitted for IOCCC judging.

Ran `make www timestamp` to perform the above.
2025-08-10 12:46:23 -07:00

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<h1>The International Obfuscated C Code Contest</h1>
<h2>1993/cmills - Bill Gates Award</h2>
<h3>X11 program that shatters and bounces windows</h3>
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<div class="navbar">
<a class="Left" href="../ant/index.html">&larr; 1993/ant</a>
<a class="Left" href="../index.html">&uarr; 1993 &uarr;</a>
<a class="Left" href="../dgibson/index.html">1993/dgibson &rarr;</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1993/cmills/cmills.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Christopher_Mills">Christopher Mills</a><br>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
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<h2 id="to-build">To build:</h2>
<p>We recommend you try the alternate version first so you can get a better idea of what
this entry was like back in 1993 (though see the <a href="../../bugs.html#1993_cmills">known bug in
bugs.html</a>). See the <a href="#original-code">original code</a>
section below to run the original (the bug also exists here).</p>
<pre><code> make alt</code></pre>
<p><strong>NOTE</strong>: this entry requires the <code>X11/Xlib.h</code> header file and the X11 library to
compile. For more information see the
FAQ on “<a href="../../faq.html#X11">X11</a>”.</p>
<p>To configure how many microseconds to sleep before updates try:</p>
<pre><code> make clobber SLEEP=200 alt</code></pre>
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
<p>The current status of this entry is:</p>
<blockquote>
<p><strong>STATUS: known bug - please help us fix</strong></p>
</blockquote>
<p>For more detailed information see <a href="../../bugs.html#1993_cmills">1993/cmills in bugs.html</a>.</p>
<h2 id="to-use">To use:</h2>
<pre><code> DISPLAY=&quot;your_X_server_display&quot;
export DISPLAY
./cmills.alt [speed] # must be run on an X11 server</code></pre>
<p>where:</p>
<p><code>speed</code> is update speed from 1 to 9 (default is 9).</p>
<p><strong>NOTE</strong>: in most cases <code>DISPLAY</code> should already be set.</p>
<h2 id="original-code">Original code:</h2>
<p>We recommend the version that uses <code>usleep(3)</code> to more easily see what is going
on but you can use the original without any delays if you wish.</p>
<h3 id="original-build">Original build:</h3>
<pre><code> make all</code></pre>
<h3 id="original-use">Original use:</h3>
<p>Use <code>cmills</code> as you would <code>cmills.alt</code> above.</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>From the San Jose Mercury News (May 15, 1993 page 20A “West Hackers
trounce East in computer quiz game”):</p>
<blockquote>
<p>“Since 1984, a contest has been held on Usenet for the most unreadable,
creative, bizarre but working C program”, Gates said. “What is the name of this
contest?”</p>
<p>“<strong>Windows</strong>,” shot back <em>Gassee</em>, naming Microsoft’s premier product - a
product over which Apple sued Microsoft five years ago. Not the right answer -
it’s “<strong>The Obfuscated C Contest</strong> [sic]” - but it brought down the house of Apple
partisans…</p>
</blockquote>
<p>[The expression on Bill Gates’ face was a sight to behold, as reported
to us by several who were there].</p>
<p>You must set <code>$DISPLAY</code> in your environment or the program will
dump core. This is not a bug as the author documented it as
a feature. :-)</p>
<p>The optional argument is integer which controls the speed of the
program. By default the speed is 9. You may want to try 1.</p>
<p>You will have to kill the program (i.e., ^C) to stop it.</p>
<p>WARNING: Slow servers or servers with long request queues will
continue to ‘run’ for a while after you have killed
the program.</p>
<p>This program makes your windows about as useful as their windows. :-)</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p>The program uses a single backing pixmap (which is the size of the
screen) for all of its subwindows (with a little bit of trickery to
move the offset around). This is much better (and faster) than the
obvious implementation which would require a full-screen pixmap and
a separate backing pixmap for each subwindow.</p>
<p>The chance that a window breaks is based on it’s kinetic energy,
which in turn is based on it’s area and speed. How silly!</p>
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<div id="inventory">
<h1 id="inventory-for-1993cmills">Inventory for 1993/cmills</h1>
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<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/cmills/cmills.c">cmills.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/cmills/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/cmills/cmills.alt.c">cmills.alt.c</a> - alternate source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/cmills/cmills.orig.c">cmills.orig.c</a> - original source code</li>
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<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/cmills/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/cmills/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/cmills/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
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