Landon Curt Noll
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<title>2001/schweikh - Best one-liner</title>
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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>2001/schweikh - Best one-liner</h2>
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<div class="navbar">
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<a class="Left" href="../rosten/index.html">← rosten</a>
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<a class="Left" href="../index.html">↑ 2001 ↑</a>
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<a class="Left" href="../westley/index.html">westley →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/schweikh/schweikh.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/schweikh/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%2F2001%2Fschweikh%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#Jens_Schweikhardt">Jens Schweikhardt</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#2001_schweikh">2001 schweikh bugs</a>.</p>
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<h2 id="to-use">To use:</h2>
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<pre><code> ./schweikh string string2</code></pre>
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<p>This program will very likely crash or do something else if you do not give it
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two args.</p>
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<p>Note also that the glob pattern must match the whole string. See the author’s
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comments for details and a workaround.</p>
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<p>There’s also no way to escape meta characters.</p>
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<p>This is supposed to happen. As is written in the
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<a href="http://catb.org/jargon/html/F/feature.html">The Jargon File</a>:</p>
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<pre><code> That's not a bug, that's a feature.</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>Do you get the pattern here?</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<p>This one-liner program is a glob pattern matcher. It understands
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the glob characters <code>*</code> meaning ‘zero or more characters’ and
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<code>?</code> meaning exactly one character, just like your unix shell.</p>
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<p>Run it with two args, the string and the glob pattern. The exit status is 0
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(shell true) when the pattern matches, 1 otherwise. The glob pattern must match
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the whole string, so you may want to use <code>*</code> at the beginning and end of the
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pattern if you are looking for something in the middle.</p>
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<p>You can use it for your shell scripting needs similar to a silent grep
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(and without <code>stdout</code> redirected to <code>/dev/null</code>):</p>
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<pre><code> if prog "${VARIABLE}" '<glob>'; then
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echo VARIABLE matches
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else
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echo no match
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fi</code></pre>
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<h3 id="bugs">Bugs</h3>
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<p>There is no way to escape the meta characters. Dammit Jim, I’m a
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one-liner, not a regexp lib.</p>
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<p>All obfuscation is obviously in the recursive <code>m()</code> function, an 86
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character glob pattern evaluator, returning nonzero for a match:</p>
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<ul>
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<li>Just a single complex return expression.</li>
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<li>Nested ternary operator <code>?:</code> to save on <code>if</code>/<code>else</code> verbosity.</li>
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<li>Short circuiting <code>&&</code> and <code>||</code> to save even more on <code>if</code>/<code>else</code> verbosity.</li>
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<li>Subtraction instead of an equality operator in <code>*t - 42</code>.</li>
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<li>ASCII codes for <code>*</code> and <code>?</code>.</li>
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<li>Careful use of blanks even though this year’s rules have extended
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that resource limit.</li>
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<li>The source is a complete preprocessed C program. Because it communicates
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with the world out there by means of <code>argv</code> and the exit status, there
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is no need for <code>stdio.h</code> bloat. An asm guru could surely squeeze this
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program in less than a screenful.</li>
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<li><code>indent(1)</code> is probably not too helpful.</li>
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</ul>
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<p>The recursion wonderfully and magically takes care of iteration and
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backtracking. I could tell you how it works but then I would have to
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<strike>kill</strike> request a NDA from you :-) Run it under a debugger with several
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inputs, it will be quite helpful and instructive. Handling of <code>?</code> is
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straightforward; for <code>*</code> start out with <code>*foo</code> and <code>foo*</code> against <code>foo</code>.
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How does it deal with sequences of adjacent <code>*</code>? How could this be
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improved? If all else fails, recode the <code>?:</code> operators with <code>if</code>/<code>else</code> and
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try again. For extra credit implement character classes like <code>[a-z]</code>.</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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<div id="inventory">
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<h1 id="inventory-for-2001schweikh">Inventory for 2001/schweikh</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/2001/schweikh/schweikh.c">schweikh.c</a> - entry source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/schweikh/Makefile">Makefile</a> - entry Makefile</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/schweikh/schweikh.orig.c">schweikh.orig.c</a> - original source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/schweikh/try.sh">try.sh</a> - how to run</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="2001_schweikh.tar.bz2">2001_schweikh.tar.bz2</a> - download entry tarball</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/schweikh/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/2001/schweikh/.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/2001/schweikh/.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/2001/schweikh/.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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<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>You should <b>carefully review</b> all of the terms and conditions of the
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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%2F2001%2Fschweikh%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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