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ioccc/2024/stedolan/index.html
T
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>2024/stedolan - Best one liner</h2>
<h3>icon from MD5</h3>
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<a class="Left" href="../mills/index.html">&larr; 2024/mills</a>
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2024/stedolan/prog.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Stephen_Dolan">Stephen Dolan</a><br>
Location: <a href="../../location.html#IE">IE</a> - <em>Republic of Ireland</em> (<em>Ireland</em>)</li>
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<h2 id="award-presentation">Award presentation:</h2>
<p>Watch the <a href="https://www.youtube.com/@OurFavoriteUniverse">Our Favorite Universe</a>
YouTube show for this entry:</p>
<blockquote>
<p><a href="https://www.youtube.com/watch?v=NJ-e4SgXGpw">IOCCC28 - 2024/stedolan - Best one liner</a></p>
</blockquote>
<h2 id="to-build">To build:</h2>
<pre><code> make all</code></pre>
<h2 id="to-use">To use:</h2>
<pre><code> echo {10-hex-digits} | ./prog &gt; out.pbm</code></pre>
<h2 id="try">Try:</h2>
<pre><code> md5sum prog.c | ./prog | display -</code></pre>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>There are no magic numbers in the program, and bits of the input map to pixels of the output
in a regular way, yet it outputs a nice icon for itself, if given the MD5 hash of its own source. How?</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p>This program is a decoder for a very compact icon format, producing 80x80
pixel <strong>pbm images</strong> based on small bitmapped icons:</p>
<pre><code> echo faf6bdafe6 | ./prog | display - # calendar
echo f843928fe0 | ./prog | display - # mail
echo f0b42d0bd8 | ./prog | display - # battery
echo f39ce33bc0 | ./prog | display - # 1
echo f0aced1bc0 | ./prog | display - # 2
echo f1b4ed1bc0 | ./prog | display - # 3
echo 4010881098 | ./prog | display - # ?
echo c6018c7398 | ./prog | display - # !
echo de848d2c3c | ./prog | display - # the tetrominos</code></pre>
<p><strong>NOTE</strong>: The use of <code>| display -</code> is optional. If omitted,
just view the resulting output in a terminal with a small font size.</p>
<p><strong>NOTE</strong>: Else if do not have ImageMagick’s <code>display(1)</code> tool installed
the use <strong>pbm image</strong> viewing tool of your choice.</p>
<p>Effort has been made to reduce the size of the program text to a single
longish line (135 characters, including newline). Regrettably, this left no
space in which to store the program’s own icon, a picture of a computer
screen displaying ‘C’.</p>
<p>Accordingly, the program’s icon is instead stored in the program’s MD5 hash:</p>
<pre><code> md5sum prog.c | ./prog | display -</code></pre>
<p><strong>NOTE</strong>: On machines without <code>md5sum(1)</code>, try <code>md5</code> or <code>openssl md5 -r</code>.</p>
<h3 id="notes">Notes</h3>
<ul>
<li><p>While terseness was preferred over obscurity, this program hopefully
still lives down to IOCCC’s usual standards of clarity.</p>
<p>The program should be readable to any C programmer familiar with its
less common operators, including French-quoted literals (<code>&lt;&lt;5&gt;&gt;</code>), the
interrobang (<code>?!</code>) and the wink (<code>^-</code>).</p></li>
<li><p>To fit on one line, the program commits two anachronistic sins: it
assumes an implicit <code>int</code> return type for <code>main</code>, and it uses several
stdlib functions without including the relevant header.</p>
<p>It can be compiled by switching to <code>-std=c89</code> (remembering a time when
such crimes were let off with a warning), or by covering up the crimes
with <code>-Dmain='int main' -include stdio.h</code>, at which point it is valid
under any version of C.</p></li>
<li><p>Even with these compiler options, Clang and GCC with <code>-Wall</code> also issue
a warning complaining that the program correctly uses weird parts of
the C operator precedence table. No apology is made for this one.</p></li>
<li><p>Several variants of this program were considered. Several.</p></li>
<li><p>The icon format is compressed, not just bit-packed: there are more
pixels in the output than bits in the input.</p></li>
<li><p>By an astonishing coincidence, the number of bits in the input format
is approximately the log2 of the number of MD5 evaluations that a
five-year-old GPU can do in an hour.</p></li>
</ul>
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<div id="inventory">
<h1 id="inventory-for-2024stedolan">Inventory for 2024/stedolan</h1>
</div>
<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/stedolan/prog.c">prog.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/stedolan/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/stedolan/prog.orig.c">prog.orig.c</a> - original source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/stedolan/try.sh">try.sh</a> - script to try entry</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="2024_stedolan.tar.bz2">2024_stedolan.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/stedolan/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/stedolan/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/stedolan/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
<li><a href=".path">.path</a> - directory path from top level directory</li>
<li><a href="index.html">index.html</a> - this web page</li>
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