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<h1>The International Obfuscated C Code Contest</h1>
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<h2>1990/dg - Best Abuse of the C Preprocessor</h2>
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<a class="Left" href="../dds/index.html">← dds</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#David_Goodenough">David Goodenough</a><br>
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Location: <a href="../../location.html#ZZ">ZZ</a> - <em>Unknown location</em></li>
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<h2 id="to-build">To build:</h2>
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<pre><code> make all</code></pre>
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<h2 id="to-use">To use:</h2>
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<pre><code> echo foo bar | ./dg</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>Some C preprocessors got confused about single quotes in certain cases.
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In particular, the following source line:</p>
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<pre><code> b12(ase(bco(acp(bi(acp(bcp(acp(bpl(aqu(bqu(A))))))))))))))))))))))))))))))</code></pre>
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<p>sometimes has to be changed to:</p>
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<pre><code> b12(ase(bco(acp(bi(acp(bcp(acp(bpl('A'))))))))))))))))))))))))))))</code></pre>
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<p>particularly if the C preprocessor botches single quotes in cpp expansions,
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which we have done for the wider audience.</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<p>If my preprocessor could hack it, I could write this as one single line rather
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than 4, but when I do that I get a complaint “defines nested too deeply”.</p>
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<h3 id="obfuscation-spoiler">Obfuscation spoiler:</h3>
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<p>This is another rot13 job (believe it or not) - the <code>#defines</code> are a
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novel way of adding tokens: <code>#define b12(x) 12 x</code> means that at
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some point in the source a <code>12</code> is followed by the compressed nested
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<code>#define</code>s. The <code>b12</code> gets the previous compression as an argument, and
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prepends the <code>12</code>, thus making another step in the recreation of the
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source. The <code>axx()</code> <code>#define</code>s do the same, but add tokens after.</p>
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<p>As for the rot13 algorithm, it relies on <code>index(3)</code> to find if the
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character is in the set <code>A-Za-z</code>. <code>l[]</code> is an array that gets filled
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with:</p>
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<pre><code> "nopqrstuvwxyzzzzabcdefghijklmmmmNOPQRSTUVWXYZZZZABCDEFGHIJKLMMMM"</code></pre>
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<p>If <code>index(3)</code> says the char is in the alphabet, then XOR the offset
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with <code>16</code> to translate, and output, otherwise pass it unchanged.</p>
|
||
<!--
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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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<div id="inventory">
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<h1 id="inventory-for-1990dg">Inventory for 1990/dg</h1>
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</div>
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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/1990/dg/dg.c">dg.c</a> - entry source code</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/dg/Makefile">Makefile</a> - entry Makefile</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/dg/dg.orig.c">dg.orig.c</a> - original source code</li>
|
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/dg/try.sh">try.sh</a> - script to try entry</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="1990_dg.tar.bz2">1990_dg.tar.bz2</a> - download entry tarball</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/dg/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/1990/dg/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/dg/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
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<li><a href="index.html">index.html</a> - this web page</li>
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<h4>
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Jump to: <a href="#">top</a>
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</h4>
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</div>
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<!-- START: this line starts content from: inc/footer.default.html -->
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<!--
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
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|
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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)
|
||
|
||
For more information, see:
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|
||
https://creativecommons.org/licenses/by-sa/4.0/
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|
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-->
|
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<div class="footer">
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|
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<div id="copyright"><h3>Copyright © 1984-2024 by Landon Curt Noll:
|
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<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">Some Rights Reserved</a></h3>
|
||
<p>
|
||
This work is <b>licensed by Landon Curt Noll</b> under
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
|
||
target="_blank"
|
||
rel="license noopener noreferrer"
|
||
style="display:inline-block;">CC BY-SA 4.0</a></b>.
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/cc.png"
|
||
alt="cc inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/by.png"
|
||
alt="person inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/sa.png"
|
||
alt="arrow looping back on itself inside circle symbol"><br>
|
||
You should <b>carefully review</b> the
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">CC BY-SA 4.0 LEGAL CODE</a></b>
|
||
before using the licensed material.<br>
|
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You may wish to review the
|
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<b><a href="../../license.html"
|
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target="_blank"
|
||
rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
|
||
of <b>CC BY-SA 4.0</b>.<br>
|
||
</p>
|
||
</div>
|
||
|
||
<div id="coda"><h3>Coda</h3>
|
||
<p>
|
||
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1990%2Fdg%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
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<a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a><br>
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