Landon Curt Noll
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<img src="../../png/ioccc.png" alt="IOCCC image by Matt Zucker" width=300 height=110>
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<h1>The International Obfuscated C Code Contest</h1>
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<h2>2011/borsanyi - Best data utility</h2>
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<div class="navbar">
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<a class="Left" href="../blakely/index.html">← blakely</a>
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<a class="Left" href="../index.html">↑ 2011 ↑</a>
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<a class="Left" href="../dlowe/index.html">dlowe →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/borsanyi.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
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<h2 id="author">Author:</h2>
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<ul>
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<li>Name: <a href="../../authors.html#Szabolcs_Borsanyi">Szabolcs Borsanyi</a><br>
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Location: <a href="../../location.html#DE">DE</a> - <em>Federal Republic of Germany</em> (<em>Germany</em>)</li>
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<h2 id="to-build">To build:</h2>
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<pre><code> make</code></pre>
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<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
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<p>The current status of this entry is:</p>
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<pre><code> STATUS: INABIAF - please **DO NOT** fix</code></pre>
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<p>For more detailed information see <a href="../../bugs.html#2011_borsanyi">2011 borsanyi bugs</a>.</p>
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<h2 id="to-use">To use:</h2>
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<pre><code> ./borsanyi < some_data_file</code></pre>
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<h2 id="try">Try:</h2>
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<pre><code> ./try.sh</code></pre>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>This is a nice quick <a href="https://en.wikipedia.org/wiki/Histogram">histogram</a>
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plotter. A useful utility when you need to look at the distribution of some
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data.</p>
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<h3 id="challenges">Challenges:</h3>
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<p>You can modify the number of histogram
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<a href="https://en.wikipedia.org/wiki/Data_binning">bins</a> and the scaling of the
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histogram by editing the source. Try to find them!</p>
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<p>If you look at the source you will notice that the usual array of
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histogram bins is missing. The source contains no arrays and it does not
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use <code>malloc(3)</code> or <code>alloca(3)</code>. How does it build the histogram?</p>
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<p>While the input does not need to be sorted, the histogram output is sorted.
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How does it put the data into buckets? Why does it <code>fork(2)</code> 22 times?</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<p>This small piece of program is meant to be a useful tool, when
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there are some data around and you need a quick glance at the
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histogram. I am all too often logged in to a remote machine with
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slow X connection, and a terminal-based program would be of
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great help.</p>
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<h3 id="limitations">Limitations</h3>
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<ul>
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<li>I optimized the output for the data I had around, you might want to adjust
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for your needs. For a great excess of data points the program will crash
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(depending on the available stack).</li>
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<li>Giving too few (distinct) points can also cause crash (or division by zero).</li>
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<li>The program expects plain numbers separated by white spaces.</li>
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<li>ASCII is assumed.</li>
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<li>Some POSIX-like system is assumed (<code>fork()</code> and <code>wait(NULL)</code> are used).</li>
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<li>Do not give any arguments to the program.</li>
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<li>Could rounding errors cause the omission of the highest bin? There might be
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empty bins at the edges.</li>
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</ul>
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<h3 id="obfuscation">Obfuscation</h3>
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<ul>
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<li>The program follows a rather unconventional approach to the task
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of histogram building. The usual array of integers (for the histogram
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bins) is missing entirely. The data are read once, the range is determined,
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but the data points are not put in any array. Yet they are remembered,
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and each of them is put into its own bin afterwards. But where are the bins?</li>
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<li>I tried to use as few keywords as possible, hence there are no loops.</li>
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<li>Multi-process approach for optimal use of resources.</li>
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<li>Some bin size obfuscation.</li>
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</ul>
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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<div id="inventory">
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<h1 id="inventory-for-2011borsanyi">Inventory for 2011/borsanyi</h1>
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</div>
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<p><a href="#top">Jump to top</a></p>
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<h2 id="primary-files">Primary files</h2>
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<ul>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/borsanyi.c">borsanyi.c</a> - entry source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/Makefile">Makefile</a> - entry Makefile</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/borsanyi.orig.c">borsanyi.orig.c</a> - original source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/try.sh">try.sh</a> - how to run</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/data.1">data.1</a> - sample input</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/data.2">data.2</a> - sample input</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/data.3">data.3</a> - sample input</li>
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</ul>
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<h2 id="secondary-files">Secondary files</h2>
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<ul>
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<li><a href="2011_borsanyi.tar.bz2">2011_borsanyi.tar.bz2</a> - download entry tarball</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/README.md">README.md</a> - markdown source for this web page</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/.entry.json">.entry.json</a> - description of entry in JSON</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/.path">.path</a> - directory path from top directory</li>
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<li><a href="index.html">index.html</a> - this web page</li>
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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<p>All IOCCC content including this file and web page are:</p>
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<b> Copyright © 1984-2024 by Landon Curt Noll. <a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean">Some Rights Reserved</a>.</b>
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<p>This work is licensed by Landon Curt Noll under:</p>
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<h2>Coda</h2>
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<p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2011%2Fborsanyi%2Findex.html">Nu HTML check this web page</a></p>
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