Landon Curt Noll
a9ca93ec47
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<div class="header">
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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>2000/schneiderwent - Most Timely Output</h2>
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<div class="navbar">
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<a class="Left" href="../robison/index.html">← robison</a>
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<a class="Left" href="../index.html">↑ 2000 ↑</a>
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<a class="Left" href="../thadgavin/index.html">thadgavin →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2000/schneiderwent/schneiderwent.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2000/schneiderwent/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2000%2Fschneiderwent%2Findex.html">✓</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#Craig_Schneiderwent">Craig Schneiderwent</a><br>
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Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
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<!-- BEFORE: 1st line of markdown file: 2000/schneiderwent/README.md -->
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<h2 id="to-build">To build:</h2>
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<pre><code> make</code></pre>
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<h2 id="to-use">To use:</h2>
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<pre><code> ./schneiderwent</code></pre>
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<h2 id="try">Try:</h2>
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<pre><code> ./schneiderwent schneiderwent.data
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./schneiderwent</code></pre>
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<p>What’s the difference?</p>
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<p>If you have a long while to spare (and you’re bored enough that you could watch
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paint dry :-) ) you might also try:</p>
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<pre><code> ./try.sh</code></pre>
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<p>Alternatively, you can check on it later on, to see all the entry does. Or if
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you wish to make it run faster, you can override how long it sleeps per
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iterations and how many iterations it runs. For instance to make it sleep only
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30 seconds and run only twice:</p>
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<pre><code> SLEEP=30 ITERATIONS=2 ./try.sh</code></pre>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>Very nice play by the rules and portable text obfuscation.
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This far surpasses old tricks like adding or subtracting 1
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from every character in a C string.</p>
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<p>Translating the messages into your language of preference while
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keeping the program portable between different encodings
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(Chinese, Japanese, Russian - anyone?) may be an entertaining task.</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<p>This entry displays the current time to the console, for example:</p>
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<pre><code> it's just after ten 'til 6 in the evening</code></pre>
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<p>FWIW, none of the compilers with which this entry was tested issued
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any warnings or errors in compiling the source for this entry. No
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doubt lint will complain about the goto statements.</p>
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<p>The <a href="schneiderwent.data">schneiderwent.data</a> file consists of the values used by
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multiple table lookups. This is simply good program design, separating these
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values from the source code allows changing the behavior of the application
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without recompiling.</p>
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<p>Having learned COBOL at an early age, the <code>pthread</code>s of my thought
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processes tend to be translated into code in a verbose manner. Some
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of the <code>#define</code>s in this entry’s code are to mitigate this personal
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deficiency.</p>
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<h3 id="obfuscation">Obfuscation</h3>
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<p>Obfuscation in this entry consists of:</p>
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<ul>
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<li><code>printf(3)</code>ing console messages stored as
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<a href="https://en.wikipedia.org/wiki/EBCDIC">EBCDIC</a> character values - this is not
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an attempt at encryption, but rather at cross platform compatibility.</li>
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<li><a href="https://en.wikipedia.org/wiki/ASCII">ASCII</a> character values are calculated
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from the EBCDIC in a particularly ugly abuse of the <code>?:</code> operator.</li>
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<li>Detection of whether to print the ASCII or EBCDIC values is done by taking the
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remainder of dividing the character <code>'J'</code> by <code>2</code> - the ASCII value of the
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character is even, the EBCDIC value is odd.</li>
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<li>The messages to be <code>printf(3)</code>ed are determined via multiple table lookups and
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bit-masked values.</li>
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<li>For minutes, the bit position turned on is multiplied by two to determine the
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message to be <code>printf(3)</code>ed.</li>
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<li>For hours, the straight bit position is used.</li>
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<li>This entry mostly eschews function calls for the often overlooked
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<code>setjmp(3)</code>/<code>longjmp(3)</code> combination.</li>
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<li>The trigraphs are not there as obfuscation nor are they there to annoy the
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judges - it’s just the easiest way to get around the absence of square brackets
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in a normal 3270 environment.</li>
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</ul>
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<!--
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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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For more information, see:
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https://creativecommons.org/licenses/by-sa/4.0/
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-->
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<div id="inventory">
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<h1 id="inventory-for-2000schneiderwent">Inventory for 2000/schneiderwent</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/2000/schneiderwent/schneiderwent.c">schneiderwent.c</a> - entry source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2000/schneiderwent/Makefile">Makefile</a> - entry Makefile</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2000/schneiderwent/schneiderwent.orig.c">schneiderwent.orig.c</a> - original source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2000/schneiderwent/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/2000/schneiderwent/schneiderwent.data">schneiderwent.data</a> - table lookups values</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="2000_schneiderwent.tar.bz2">2000_schneiderwent.tar.bz2</a> - download entry tarball</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2000/schneiderwent/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/2000/schneiderwent/.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/2000/schneiderwent/.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/2000/schneiderwent/.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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</ul>
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<!--
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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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For more information, see:
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https://creativecommons.org/licenses/by-sa/4.0/
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-->
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<div id="copyright"><h2>Copyright and CC BY-SA 4.0 License</h2></div>
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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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<p><b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
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target="_blank" rel="license noopener noreferrer" style="display:inline-block;"> CC BY-SA 4.0
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<p>The <b>CC BY-SA 4.0 LEGAL CODE</b> for this license is found under:</p>
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<p> <b><a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en">
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https://creativecommons.org/licenses/by-sa/4.0/legalcode.en</a></b></p>
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<p>You should <b>carefully review</b> all of the terms and conditions of the
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<a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en">actual license</a>
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before using the licensed material.</p>
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<p>You may wish to review the <b><a href="../../license.html">highlights of some of the key
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features and terms</a></b> of the <a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en">actual license</a>.</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%2F2000%2Fschneiderwent%2Findex.html">Nu HTML check this web page</a></p>
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<p><a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a></p>
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