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>2013/dlowe - Best sparkling utility</h2>
<h3>ASCII spark line graph</h3>
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<a class="Left" href="../cable3/index.html">&larr; 2013/cable3</a>
<a class="Left" href="../index.html">&uarr; 2013 &uarr;</a>
<a class="Left" href="../endoh1/index.html">2013/endoh1 &rarr;</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2013/dlowe/dlowe.c">C code</a>
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<h2 id="author">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>)</li>
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<h2 id="to-build">To build:</h2>
<pre><code> make</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: INABIAF - please DO NOT fix</strong></p>
</blockquote>
<p>For more detailed information see <a href="../../bugs.html#2013_dlowe">2013/dlowe in bugs.html</a>.</p>
<h2 id="to-use">To use:</h2>
<pre><code> ./dlowe [number...]</code></pre>
<p>where <code>[number...]</code> is one or more number, space separated.</p>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh</code></pre>
<p>What is different about the above if you do something like:</p>
<pre><code> echo &#39;IOCCC winning entry 2013/dlowe&#39; &gt; ioccc.txt
./try.sh
rm -f ioccc.txt</code></pre>
<p>?</p>
<p>To make it simpler to see try showing just the different line like:</p>
<pre><code> ./diff.sh</code></pre>
<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="https://github.com/ioccc-src/winner/blob/master/2013/dlowe/fun.c">fun.c</a>:</p>
<pre><code> #include &lt;stdio.h&gt;
int main() {
printf(&quot;%d %d %d\n&quot;, (int)(-1.0/0.0), (int)(0.0/0.0), (int)(1.0/0.0));
}</code></pre>
<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><strong>NOTE</strong>: <code>make all</code> will compile <a href="https://github.com/ioccc-src/winner/blob/master/2013/dlowe/fun.c">fun.c</a> but to provide a different compiler
you can do something like:</p>
<pre><code> make CC=clang fun</code></pre>
<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>
<pre><code> $ ./sparkl 0 1 2 3 4 5 6 7
▁▂▃▄▅▆▇▉
$ echo &quot;sparkline of file lengths: $(wc -c * | awk &#39;{print $1}&#39; | xargs ./sparkl)&quot;
sparkline of file sizes: ▁▁▁▃▃▂▁▂▁▁▉</code></pre>
<p><strong>NOTE</strong>: this has been provided in <a href="https://github.com/ioccc-src/winner/blob/master/2013/dlowe/slflen.sh">slflen.sh</a> so you can try:</p>
<pre><code> ./slflen.sh</code></pre>
<p>instead (which <a href="https://github.com/ioccc-src/winner/blob/master/2013/dlowe/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>
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<li><a href="https://github.com/ioccc-src/winner/blob/master/2013/dlowe/dlowe.c">dlowe.c</a> - entry source code</li>
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<li><a href="https://github.com/ioccc-src/winner/blob/master/2013/dlowe/fun.c">fun.c</a> - compile and run for extra fun</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2013/dlowe/slflen.sh">slflen.sh</a> - show sparkline length of all files in current directory</li>
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