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ioccc/2011/borsanyi/index.html
T
Landon Curt Noll 9f57052020 rewrite bin/tar-entry.sh
We rewrote the `bin/tar-entry.sh` algorithm so that we do NOT have
to require Linux to produce a compressed tarball that is byte-for-byte
identical to a macOS compressed tarball for the same entry.

Changed `bin/tar-entry.sh` VERSION from "1.2 2024-03-22"
to "1.3 2024-03-25".

Added `bin/untar-entry.sh` to untar an entry from the
compressed tarball.

Added `make untar_entry_tarball` to untar all entry files.

Added `make untar_year_tarball` and `make untar_all_tarball`
stub Makefile rules.  The core it referred to does not yet exist.

Updated IOCCC manifest.  Updated `.entry.json` for `2004/sds`.

Performed `make www` to update web pages.  In most cases the
entry `index.html` added an inventory link for the new `.tar.tstamp` file.

Performed `form_entry_tarball` to complete the test of the above.

TODO: Test the results under Linux.

TODO: Update `bin/tar-year.sh`.  Update year level compressed tarballs.

TODO: Update `bin/tar-all.sh`.  Update top level compressed tarball.

TODO: Write `bin/untar-year.sh` and `bin/untar-all.sh`.
2024-03-25 22:44:34 -07:00

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<title>2011/borsanyi - Best data 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>2011/borsanyi - Best data utility</h2>
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<a class="Left" href="../blakely/index.html">&larr; blakely</a>
<a class="Left" href="../index.html">&uarr; 2011 &uarr;</a>
<a class="Left" href="../dlowe/index.html">dlowe &rarr;</a>
<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/2011/borsanyi/borsanyi.c">C code</a>
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<h2 id="author"><a name="author"></a>Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Szabolcs_Borsanyi">Szabolcs Borsanyi</a><br>
Location: <a href="../../location.html#DE">DE</a> - <em>Federal Republic of Germany</em> (<em>Germany</em>)
<br><br></li>
</ul>
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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#2011_borsanyi">2011 borsanyi 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">./borsanyi</span> <span class="op">&lt;</span> some_data_file</span></code></pre></div>
<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>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>This is a nice quick <a href="https://en.wikipedia.org/wiki/Histogram">histogram</a>
plotter. A useful utility when you need to look at the distribution of some
data.</p>
<h3 id="challenges">Challenges:</h3>
<p>You can modify the number of histogram
<a href="https://en.wikipedia.org/wiki/Data_binning">bins</a> and the scaling of the
histogram by editing the source. Try to find them!</p>
<p>If you look at the source you will notice that the usual array of
histogram bins is missing. The source contains no arrays and it does not
use <code>malloc(3)</code> or <code>alloca(3)</code>. How does it build the histogram?</p>
<p>While the input does not need to be sorted, the histogram output is sorted.
How does it put the data into buckets? Why does it <code>fork(2)</code> 22 times?</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p>This small piece of program is meant to be a useful tool, when
there are some data around and you need a quick glance at the
histogram. I am all too often logged in to a remote machine with
slow X connection, and a terminal-based program would be of
great help.</p>
<h3 id="limitations">Limitations</h3>
<ul>
<li>I optimized the output for the data I had around, you might want to adjust
for your needs. For a great excess of data points the program will crash
(depending on the available stack).</li>
<li>Giving too few (distinct) points can also cause crash (or division by zero).</li>
<li>The program expects plain numbers separated by white spaces.</li>
<li>ASCII is assumed.</li>
<li>Some POSIX-like system is assumed (<code>fork()</code> and <code>wait(NULL)</code> are used).</li>
<li>Do not give any arguments to the program.</li>
<li>Could rounding errors cause the omission of the highest bin? There might be
empty bins at the edges.</li>
</ul>
<h3 id="obfuscation">Obfuscation</h3>
<ul>
<li>The program follows a rather unconventional approach to the task
of histogram building. The usual array of integers (for the histogram
bins) is missing entirely. The data are read once, the range is determined,
but the data points are not put in any array. Yet they are remembered,
and each of them is put into its own bin afterwards. But where are the bins?</li>
<li>I tried to use as few keywords as possible, hence there are no loops.</li>
<li>Multi-process approach for optimal use of resources.</li>
<li>Some bin size obfuscation.</li>
</ul>
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<h1 id="inventory-for-2011borsanyi"><a name="inventory"></a>Inventory for 2011/borsanyi</h1>
<p><a href="#top">Jump to top</a></p>
<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/borsanyi.c">borsanyi.c</a> - entry source</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/Makefile">Makefile</a> - entry Makefile</li>
<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>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/try.sh">try.sh</a> - how to run</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/data.1">data.1</a> - sample input</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/data.2">data.2</a> - sample input</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/data.3">data.3</a> - sample input</li>
<li><a href="2011_borsanyi.tar.bz2">2011_borsanyi.tar.bz2</a> - download entry source</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/2011/borsanyi/README.md">README.md</a> - markdown source for index.html</li>
<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>
<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>
<li><a href=".path">.path</a> - directory path from top directory</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/borsanyi/.tar.tstamp">.tar.tstamp</a> - timestamp of compressed tarball formation</li>
</ul>
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<h2>Copyright and CC BY-SA 4.0 License</h2>
<p>This file and web page is:</p>
<blockquote><b>Copyright &copy; 1984-2024 by Landon Curt Noll. All Rights Reserved.</b></p></blockquote>
<p>You are free to share and adapt this file under the terms of this license:</p>
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href="https://creativecommons.org/licenses/by-sa/4.0/">https://creativecommons.org/licenses/by-sa/4.0/</a></blockquote>
<h2>Coda</h2>
<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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