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ioccc/2015/yang/index.html
T
Cody Boone Ferguson 1ac055fa85 Reword the recent deobfuscation changes
In most cases the word was changed to 'obfuscation' as it was about
obfuscation, not deobfuscation. In some cases like 1995/leo since the
file was (in 1995/leo) about a secret switch it was changed to
'secret.md' (and 'secret.html') but there were others like that as well.

One entry had the words 'spoiling the size rule' but this had been
changed to 'deobfuscating the size rule' which was obviously wrong.

In the latter YYYY/README.md files the judges had written after some
entries (brief summaries) '...

    ...We'll stop spouting spoilers now. Have fun exploring all the
    entries!

but that was changed to:

    ...We'll stop spouting deobfuscation information now. Have fun
    exploring all the entries!

which wasn't really about deobfuscation but just a brief summary of what
the entries did.

And in the most problematic case (at least for me :-), 2018/ferguson) I
had put a joke in:

    ... but it's the only Easter egg I won't spoil

but it was changed to 'won't deobfuscate' which not only is not what it
is but it spoilt the joke.

In some cases the word was changed back to 'SPOILER' (or similar) but in
most cases not. I believe it should be better now. There are some
caveats, however, as below.

Although make find_missing_links is okay I do not remember if this will
catch links that refer to '%%REPO_URL%%' or other pandoc tokens. This
means I might have to go back to some earlier years to verify links are
okay. That should not take that much time I hope.

It might also be that some wording can still be improved some but it is
hoped this will be discovered when checking links and looking over the
manifest (which obviously changed).
2024-07-04 09:03:45 -07:00

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<h1>The International Obfuscated C Code Contest</h1>
<h2>2015/yang - Most pointed reaction</h2>
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<a class="Left" href="../schweikhardt/index.html">&larr; schweikhardt</a>
<a class="Left" href="../index.html">&uarr; 2015 &uarr;</a>
<a class="Left Disabled" href="#">last entry</a>
<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2015/yang/prog.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Don_Yang">Don Yang</a><br>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</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> echo Some text | ./prog</code></pre>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh</code></pre>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>Before analysing the code in detail we were able to guess two out of four tests
this entry uses to tell the 5 languages/flavors apart. Can you find all four?</p>
<p>The way the text is encoded in the output doesn’t cease to amaze. Can you tell
why an array of 512 elements is needed?</p>
<p>NOTE: the author calls the program <code>Fuuko</code> and so the source file referred to in
their remarks uses <code>fuuko.c</code>. The <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2015/yang/Makefile">Makefile</a> will compile everything
so you need not worry about this.</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p><code>Fuuko</code> is a <a href="https://en.wikipedia.org/wiki/Starfish">sea star</a> generator. Feed
her some input through <code>stdin</code> to get lots of sea star patterns on <code>stdout</code>.</p>
<pre><code> cc -O3 -std=c90 fuuko.c -lm -o fuuko_c90
echo IOCCC | ./fuuko_c90 &gt; output_c90.c</code></pre>
<p>If you compile with a C99 compiler instead of C90, the sea stars will
have eyes.</p>
<pre><code> cc -O3 -std=c99 fuuko.c -lm -o fuuko_c99
echo IOCCC | ./fuuko_c99 &gt; output_c99.c</code></pre>
<p>Don’t like <a href="https://en.wikipedia.org/wiki/Starfish">sea stars</a>? Use a C++98
compiler to get a <a href="https://en.wikipedia.org/wiki/Dango">dango</a> instead.</p>
<pre><code> g++ -O3 -std=c++98 fuuko.c -lm -o fuuko_cpp98
echo IOCCC | ./fuuko_cpp98 &gt; output_cpp98.c</code></pre>
<p>Don’t like <a href="https://en.wikipedia.org/wiki/Dango">dango</a> either? Use a C++11
compiler to get just <a href="https://en.wikipedia.org/wiki/Circle">circles</a> (or <a href="https://en.wikipedia.org/wiki/Swiss_cheeses_and_dairy_products">Swiss
cheese</a>, if you
prefer that).</p>
<pre><code> g++ -O3 -std=c++11 fuuko.c -lm -o fuuko_cpp11
echo IOCCC | ./fuuko_cpp11 &gt; output_cpp11.c</code></pre>
<p>Don’t like any of these patterns? Use a C11 compiler and there will be
no extra pattern.</p>
<pre><code> cc -O3 -std=c11 fuuko.c -lm -o fuuko_c11
echo IOCCC | ./fuuko_c11 &gt; output_c11.c</code></pre>
<p>Regardless of which of these C/C++ dialects you choose, the output
will all be valid C90 code that reproduces original input on <code>stdout</code>,
filled with pointer dereferences (C stars).</p>
<p>Next time people ask you for a few pointers on C, you can run their
question through <code>Fuuko</code> and give them pointers all day long.</p>
<h3 id="compatibility">Compatibility</h3>
<p><code>Fuuko</code> has been tested under these environments:</p>
<ul>
<li>gcc 4.9.3 on Cygwin</li>
<li>gcc 4.9.2 on Linux</li>
<li>gcc 4.8.4 on Linux</li>
<li>gcc 4.6.3 on Linux (doesn’t support C11 nor C++11)</li>
<li>gcc 4.3.5 on JS/Linux</li>
<li>clang 3.5.2 on Cygwin (doesn’t work with optimization enabled,
probably cygwin bug)</li>
<li>clang 3.5.0 on Linux</li>
<li>clang 3.4.1 on Linux</li>
<li>tcc 0.9.25 on JS/Linux (C99 only)</li>
</ul>
<h3 id="features">Features</h3>
<p>The most obscure parts are in detecting the subtle differences in
different dialects. The standard committees put a lot of effort into
avoiding “quiet changes”, but <code>Fuuko</code> is still able to exploit a few of
those. It should be an interesting exercise for the reader to figure
how she did it.</p>
<p>Output patterns are usually random (except for C11). The built-in random number
generator is seeded using
<a href="https://en.wikipedia.org/wiki/Address_space_layout_randomization">ASLR</a>. On
systems where ASLR is not so random (such as cygwin), you can introduce
randomness by changing number of command line arguments to <code>Fuuko</code>.</p>
<p>Output is somewhat robust: corruption on most of the lines will
usually result in a compiler warning. This is because the output is
vastly redundant: For ~1K of input, expect output to be on the order
of ~1MB, and take ~500MB of RAM to compile.</p>
<p><a href="https://en.wikipedia.org/wiki/Computation_of_cyclic_redundancy_checks#CRC-32_algorithm">CRC32</a>
of source code is embedded in the source code itself.</p>
<p>The process of writing this program can be seen by opening
<a href="obfuscation.html">obfuscation.html</a> in a browser that supports JavaScript.</p>
<p>Code layout is inspired by <a href="https://clannad.fandom.com/wiki/Fuko_Ibuki">Ibuki
Fuuko</a>, for her love of sea stars.</p>
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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/2015/yang/prog.c">prog.c</a> - entry source code</li>
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<li><a href="2015_yang.tar.bz2">2015_yang.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2015/yang/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/2015/yang/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
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