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<h1>The International Obfuscated C Code Contest</h1>
<h2>2001/schweikh - Best one liner</h2>
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<a class="Left" href="../rosten/index.html">&larr; rosten</a>
<a class="Left" href="../index.html">&uarr; 2001 &uarr;</a>
<a class="Left" href="../westley/index.html">westley &rarr;</a>
<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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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Jens_Schweikhardt">Jens Schweikhardt</a><br>
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>
<pre><code> make</code></pre>
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
<p>The current status of this entry is:</p>
<blockquote>
<p><strong>STATUS: INABIAF - please DO NOT fix</strong></p>
</blockquote>
<p>For more detailed information see <a href="../../bugs.html#2001_schweikh">2001/schweikh in bugs.html</a>.</p>
<h2 id="to-use">To use:</h2>
<pre><code> ./schweikh string string2</code></pre>
<p>This program will very likely crash or do something else if you do not give it
two args.</p>
<p>Note also that the glob pattern must match the whole string. See the author’s
comments for details and a workaround.</p>
<p>There’s also no way to escape meta characters.</p>
<p>This is supposed to happen. As is written in the
<a href="http://catb.org/jargon/html/F/feature.html">The Jargon File</a>:</p>
<pre><code> That&#39;s not a bug, that&#39;s a feature.</code></pre>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh</code></pre>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>Do you get the pattern here?</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p>This one-liner program is a glob pattern matcher. It understands
the glob characters <code>*</code> meaning ‘zero or more characters’ and
<code>?</code> meaning exactly one character, just like your unix shell.</p>
<p>Run it with two args, the string and the glob pattern. The exit status is 0
(shell true) when the pattern matches, 1 otherwise. The glob pattern must match
the whole string, so you may want to use <code>*</code> at the beginning and end of the
pattern if you are looking for something in the middle.</p>
<p>You can use it for your shell scripting needs similar to a silent grep
(and without <code>stdout</code> redirected to <code>/dev/null</code>):</p>
<pre><code> if prog &quot;${VARIABLE}&quot; &#39;&lt;glob&gt;&#39;; then
echo VARIABLE matches
else
echo no match
fi</code></pre>
<h3 id="bugs">Bugs</h3>
<p>There is no way to escape the meta characters. Dammit Jim, I’m a
one-liner, not a regexp lib.</p>
<p>All obfuscation is obviously in the recursive <code>m()</code> function, an 86
character glob pattern evaluator, returning nonzero for a match:</p>
<ul>
<li>Just a single complex return expression.</li>
<li>Nested ternary operator <code>?:</code> to save on <code>if</code>/<code>else</code> verbosity.</li>
<li>Short circuiting <code>&amp;&amp;</code> and <code>||</code> to save even more on <code>if</code>/<code>else</code> verbosity.</li>
<li>Subtraction instead of an equality operator in <code>*t - 42</code>.</li>
<li>ASCII codes for <code>*</code> and <code>?</code>.</li>
<li>Careful use of blanks even though this year’s rules have extended
that resource limit.</li>
<li>The source is a complete preprocessed C program. Because it communicates
with the world out there by means of <code>argv</code> and the exit status, there
is no need for <code>stdio.h</code> bloat. An asm guru could surely squeeze this
program in less than a screenful.</li>
<li><code>indent(1)</code> is probably not too helpful.</li>
</ul>
<p>The recursion wonderfully and magically takes care of iteration and
backtracking. I could tell you how it works but then I would have to
<del>kill</del> request a NDA from you :-) Run it under a debugger with several
inputs, it will be quite helpful and instructive. Handling of <code>?</code> is
straightforward; for <code>*</code> start out with <code>*foo</code> and <code>foo*</code> against <code>foo</code>.
How does it deal with sequences of adjacent <code>*</code>? How could this be
improved? If all else fails, recode the <code>?:</code> operators with <code>if</code>/<code>else</code> and
try again. For extra credit implement character classes like <code>[a-z]</code>.</p>
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<h1 id="inventory-for-2001schweikh">Inventory for 2001/schweikh</h1>
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<h2 id="primary-files">Primary files</h2>
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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 code</li>
<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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