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ioccc/2005/timwi/index.html
T
Cody Boone Ferguson 009e1b7522 Link in SECURITY.html to all web pages
The location of the link is in the About menu under the 'Contacting the
IOCCC' and above 'Thanks for the help'. At first I had it at the very
bottom, under 'IOCCC markdown guidelines', but it seemed better to have
it closer to contacting the IOCCC. This is the same location in the no
JavaScript menu (which, for those who do not know or forget, is not a
requirement except for some screen sizes).

The top level Makefile has a new 'security' rule. Updated make help.

Typo fixes in make help.

SECURITY.html has had a few updates as well: change the wording of entry
code is unsupported (it now says 'ALL CODE IN ALL IOCCC ENTRIES IS
UNSUPPORTED!!') and it now links to the mkiocccentry repo and how to
report a possible security vulnerability in that repo; as that IS
supported - and since there was reference to discussing security
concerns is in SECURITY.html - even though the entries will not receive
security updates - it seemed a good idea to have a link to report such
security issues in the mkiocccentry repo. Perhaps the FAQ needs to be
updated for this too.
2024-07-15 08:55:54 -07:00

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<h1>The International Obfuscated C Code Contest</h1>
<h2>2005/timwi - Most discourteous interpreter</h2>
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<a class="Left" href="../sykes/index.html">&larr; sykes</a>
<a class="Left" href="../index.html">&uarr; 2005 &uarr;</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/timwi/timwi.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Arne_Heizmann">Arne Timwi Heizmann</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>
<h2 id="to-use">To use:</h2>
<pre><code> ./timwi &lt; bf_program</code></pre>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh</code></pre>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>Unlike most <a href="https://en.wikipedia.org/wiki/Brainfuck">BF</a> interpreters that we
have been receiving for the last few years, this one, in our opinion, is the
most obfuscated albeit the most discourteous to the language it interprets. A
simple 3-character fix will make it slightly less so.</p>
<p>Quite a few BF programs found on the Net expect byte-based memory, quite a few
exceed the capacity of this interpreter, but there are many that work. Some
small <a href="https://en.wikipedia.org/wiki/Quine_(computing)">quines</a> work, some don’t.</p>
<p>Why?</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p>This is an interpreter for the programming language
<a href="https://en.wikipedia.org/wiki/Brainfuck">BrainFuck</a> (BF).</p>
<p>Input must be provided in the following format: First a sequence of integers
separated by whitespace (this will be the input to the BF program), then a <code>:</code>
(colon), then the BF program itself.</p>
<p>You must not pass any command-line arguments.</p>
<h3 id="features">Features</h3>
<ul>
<li><p>Supports the complete set of 8 BF instructions (<code>+-&lt;&gt;[].,</code>).</p></li>
<li><p>Supports the use of alternative characters for some of those instructions.
Use this to obfuscate your BF programs!</p>
<p>For a challenge, figure out what this obfuscated BF program does:</p>
<pre><code> J4mzt?Vazexx-20d~&amp;&amp;~AxdUV!x(~Jz&amp;V)x*(P=J)JUN(dizz)xx_!xx&#39;0&amp;{Vz;}&amp;Jj</code></pre>
<p>It takes two integers as input and outputs one integer.</p></li>
<li><p>Ignores all whitespace (newlines, spaces and tabs) in the input program.</p></li>
</ul>
<h3 id="limitations">Limitations</h3>
<p>Since the program, naturally, uses <code>int</code>s, the calculations must not exceed the
range of an <code>int</code>. (But then again, you can use the integer overflow to further
obfuscate your BF programs in creative ways!)</p>
<p>You are limited to 3125 input integers and 3125 instructions. If you exceed
one of these limits, the behaviour is undefined.</p>
<h3 id="obfuscations">Obfuscations</h3>
<p>Some of the superficial obfuscations are pretty obvious: I’m using <code>#define</code>s to
make everything look nice and lineal, and the program is merely a recursive
<code>main()</code> function with only a single <code>return</code> statement which uses nested ternary
operators to make even the pre-processed code unreadable.</p>
<p>However, the more subtle obfuscations relate to the way the program works.
After applying the pre-processing, you will see a lot of <code>1+1+1</code>…etc., and
even if you replace these with their result, those numbers will still not
represent (or even relate to) the ASCII codes of the BF instructions.</p>
<p>The program will first read in all the input integers, but it will begin
execution immediately and only read program instructions as they are needed.
Yet there is no global variable storing how far it has read! Perhaps the
hardest thing to figure out is how it finds the matching square brackets.</p>
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<h1 id="inventory-for-2005timwi">Inventory for 2005/timwi</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/2005/timwi/timwi.c">timwi.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/timwi/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/timwi/timwi.orig.c">timwi.orig.c</a> - original source code</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/timwi/try.sh">try.sh</a> - script to try entry</li>
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<li><a href="2005_timwi.tar.bz2">2005_timwi.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/timwi/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/2005/timwi/.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/2005/timwi/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
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