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ioccc/2013/dlowe/index.html
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Cody Boone Ferguson 3783349379 Manifest updates 
Typo fixes and change 'download entry source' to 'download entry' as
it's the tarball, not the source itself.

Rebuilt .entry.json and index.html files for all entries.
2024-03-29 08:02:01 -07:00

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<title>2013/dlowe - Best sparkling utility</title>
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<div class="header">
<img src="../../png/ioccc.png" alt="IOCCC image by Matt Zucker" width=300 height=110>
<h1>The International Obfuscated C Code Contest</h1>
<h2>2013/dlowe - Best sparkling utility</h2>
</div>
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<a class="Left" href="../cable3/index.html">&larr; cable3</a>
<a class="Left" href="../index.html">&uarr; 2013 &uarr;</a>
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<h2 id="author"><a name="author"></a>Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#J_David_Lowe">J. David Lowe</a><br>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)
<br><br></li>
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<h2 id="to-build">To build:</h2>
<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span></span></code></pre></div>
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
<p>The current status of this entry is:</p>
<pre><code>STATUS: INABIAF - please **DO NOT** fix</code></pre>
<p>For more detailed information see <a href="../../bugs.html#2013_dlowe">2013 dlowe bugs</a>.</p>
<h2 id="to-use">To use:</h2>
<div class="sourceCode" id="cb3"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./dlowe</span> <span class="pp">[</span><span class="ss">number...</span><span class="pp">]</span></span></code></pre></div>
<p>where <code>[number...]</code> is one or more number, space separated.</p>
<h2 id="try">Try:</h2>
<div class="sourceCode" id="cb4"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.sh</span></span></code></pre></div>
<p>What is different about the above if you do something like:</p>
<div class="sourceCode" id="cb5"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="bu">echo</span> <span class="st">&#39;IOCCC winning entry 2013/dlowe&#39;</span> <span class="op">&gt;</span> ioccc.txt</span>
<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.sh</span></span>
<span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a><span class="fu">rm</span> <span class="at">-f</span> ioccc.txt</span></code></pre></div>
<p>?</p>
<p>To make it simpler to see try showing just the different line like:</p>
<div class="sourceCode" id="cb6"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./diff.sh</span></span></code></pre></div>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>We liked how this entry used Unicode, specifically UTF-8, in a somewhat
obfuscated way.</p>
<p>Also, why doesn’t it crash but instead produces a correct output when called
with one argument or when all arguments are equal?</p>
<p>For extra fun, compile and run <a href="fun.c">fun.c</a>:</p>
<div class="sourceCode" id="cb7"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im">&lt;stdio.h&gt;</span></span>
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a><span class="dt">int</span> main<span class="op">()</span> <span class="op">{</span></span>
<span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a> printf<span class="op">(</span><span class="st">&quot;</span><span class="sc">%d</span><span class="st"> </span><span class="sc">%d</span><span class="st"> </span><span class="sc">%d\n</span><span class="st">&quot;</span><span class="op">,</span> <span class="op">(</span><span class="dt">int</span><span class="op">)(-</span><span class="fl">1.0</span><span class="op">/</span><span class="fl">0.0</span><span class="op">),</span> <span class="op">(</span><span class="dt">int</span><span class="op">)(</span><span class="fl">0.0</span><span class="op">/</span><span class="fl">0.0</span><span class="op">),</span> <span class="op">(</span><span class="dt">int</span><span class="op">)(</span><span class="fl">1.0</span><span class="op">/</span><span class="fl">0.0</span><span class="op">));</span></span>
<span id="cb7-4"><a href="#cb7-4" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
<p>with gcc and clang.</p>
<p>With GCC (4.7.2), we get</p>
<pre><code>-2147483648 -2147483648 -2147483648</code></pre>
<p>and with clang (3.3), we get</p>
<pre><code>-2147483648 0 2147483647</code></pre>
<p>and with Apple clang version 15.0.0 (clang-1500.0.40.1) in 2023, we get:</p>
<pre><code>1840985120 -2033041452 35979112</code></pre>
<p>Which one is correct? :)</p>
<p>NOTE: <code>make all</code> will compile <a href="fun.c">fun.c</a> but to provide a different compiler
you can do something like:</p>
<div class="sourceCode" id="cb11"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span> CC=clang fun</span></code></pre></div>
<h2 id="authors-remarks">Author’s remarks:</h2>
<h3 id="sparkl">sparkl</h3>
<p>A tiny implementation of command-line
<a href="https://en.wikipedia.org/wiki/Sparkline">sparkline</a> data visualization.</p>
<h3 id="synopsis">Synopsis</h3>
<div class="sourceCode" id="cb12"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb12-1"><a href="#cb12-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> ./sparkl 0 1 2 3 4 5 6 7</span>
<span id="cb12-2"><a href="#cb12-2" aria-hidden="true" tabindex="-1"></a><span class="ex">▁▂▃▄▅▆▇▉</span></span>
<span id="cb12-3"><a href="#cb12-3" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb12-4"><a href="#cb12-4" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> echo <span class="st">&quot;sparkline of file lengths: </span><span class="va">$(</span><span class="fu">wc</span> <span class="at">-c</span> <span class="pp">*</span> <span class="kw">|</span> <span class="fu">awk</span> <span class="st">&#39;{print $1}&#39;</span> <span class="kw">|</span> <span class="fu">xargs</span> ./sparkl<span class="va">)</span><span class="st">&quot;</span></span>
<span id="cb12-5"><a href="#cb12-5" aria-hidden="true" tabindex="-1"></a><span class="ex">sparkline</span> of file sizes: ▁▁▁▃▃▂▁▂▁▁▉</span></code></pre></div>
<p>NOTE: this has been provided in <a href="slflen.sh">slflen.sh</a> so you can try:</p>
<div class="sourceCode" id="cb13"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb13-1"><a href="#cb13-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./slflen.sh</span></span></code></pre></div>
<p>instead (which <a href="try.sh">try.sh</a> also uses).</p>
<h3 id="description">Description</h3>
<p>This is a handy little tool for visualizing numeric series from the
command line, using sparklines. Pass it a numeric series as arguments, and
<code>sparkl</code> will display a sparkline graph, which you can use to very quickly get a
sense of the shape of your data.</p>
<h3 id="limitations">Limitations</h3>
<ul>
<li>Crashes with 0 arguments. It’d be trivial to fix, but adds a few bytes to the
code.</li>
<li>Produces bogus graphs when given &gt; about 5000 arguments.</li>
<li>Only works if your terminal is UTF-8 and your font supports the 8 glyphs
used.</li>
<li>Produces a few harmless compiler warnings.</li>
</ul>
<h3 id="obfuscation">Obfuscation</h3>
<p>The code is very terse. I was torn between submitting this version, and a
one-line version compressed using a couple more <code>-D</code> flags.</p>
<p>Hand-rolled UTF-8 sequence, magic numbers (what’s that 7 for?), meaningless
variable names, reused variables, and so on.</p>
<h3 id="acknowledgements">Acknowledgements</h3>
<p>Edward Tufte invented sparklines (among other things.) Brilliant.</p>
<p>Zach Holman’s <a href="https://github.com/holman/spark">‘spark’ utility</a> was absolutely
an inspiration.</p>
<p>As I was writing up this description, I discovered I’m not the first person to
write an obfuscated C sparkline utility! Vicent Martí created
<a href="https://gist.github.com/vmg/1368661">this one</a> years (!) ago. (My
implementation is completely independent.)</p>
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<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/dlowe/dlowe.c">dlowe.c</a> - entry source</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/dlowe/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/dlowe/dlowe.orig.c">dlowe.orig.c</a> - original source</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/dlowe/diff.sh">diff.sh</a> - difference tool</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/dlowe/fun.c">fun.c</a> - compile and run for extra run</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/dlowe/slflen.sh">slflen.sh</a> - generate sparkline of file lengths</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/dlowe/try.sh">try.sh</a> - how to run</li>
<li><a href="2013_dlowe.tar.bz2">2013_dlowe.tar.bz2</a> - download entry</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="index.html">index.html</a> - entry home page</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/dlowe/README.md">README.md</a> - markdown source for index.html</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/dlowe/.entry.json">.entry.json</a> - description of entry in JSON</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/dlowe/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
<li><a href=".path">.path</a> - directory path from top directory</li>
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<h2>Coda</h2>
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