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ioccc/2001/schweikh/index.html
T
Cody Boone Ferguson cb8d8924a7 Improve links to bugs.html in README.md files
In other words rather than have the link name in the form of:

    1984 decot bugs

it is now:

    1984/decot in bugs.html

so that it matches how the entry itself looks (as in how it's
identified) and to say where (what file) it is (in). The reason it says
'in bugs.html' rather than 'bugs' (saying that the entry has bugs) is
because not all are bugs and it's saying where to see it anyway. But
some are features, others are missing links or files or other things
like that and to keep the same form it now says 'in bugs.html'.

This was done with my sgit(1) tool like:

    sgit -e 's,\([0-9][0-9][0-9][0-9]\) \([-a-z\.0-9]*\) bugs,\1/\2 in bugs.html,g' '*/*md'

The link to bugs.html itself has the path '../../bugs.html'. This is
important as it's meant to be rendered in the browser. At first this was
not remembered and I did something like:

    sgit -e 's,\[\([0-9][0-9][0-9][0-9]\) \([-a-z\.0-9]*\) bugs\](../../bugs.html,\[\1/\2 in bugs.html\](%%REPO_URL%%/bugs.html,g' '*/*md'

but this was changed to the simpler one due to the problem described
above. It's worth putting this note here as a reminder, though, so I
have included it here.
2024-05-04 09:21:09 -07:00

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<h1>The International Obfuscated C Code Contest</h1>
<h2>2001/schweikh - Best one-liner</h2>
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<div class="navbar">
<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>
<pre><code> STATUS: INABIAF - please **DO NOT** fix</code></pre>
<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>
<ul>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/schweikh/schweikh.c">schweikh.c</a> - entry source</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/schweikh/Makefile">Makefile</a> - entry Makefile</li>
<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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</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="2001_schweikh.tar.bz2">2001_schweikh.tar.bz2</a> - download entry tarball</li>
<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>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/schweikh/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<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>
<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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