Files
Landon Curt Noll a1c86c8a7a add original C links to entry navigation bars
The navigation bar for a winning entry now has a "_Original C_" link
(between the ✅ and the Inventory on the right hand side) so that one
may easily view the original C code that was submitted for IOCCC judging.

Ran `make www timestamp` to perform the above.
2025-08-10 12:46:23 -07:00

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<h1>The International Obfuscated C Code Contest</h1>
<h2>2012/hou - Most useful obfuscation</h2>
<h3>Syntax highlighter</h3>
</div>
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<div class="navbar">
<a class="Left" href="../hamano/index.html">&larr; 2012/hamano</a>
<a class="Left" href="../index.html">&uarr; 2012 &uarr;</a>
<a class="Left" href="../kang/index.html">2012/kang &rarr;</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2012/hou/hou.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Qiming_HOU">Qiming HOU</a><br>
Location: <a href="../../location.html#CN">CN</a> - <em>People’s Republic of China</em> (<em>China</em>)</li>
</ul>
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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> ./hou syntax-file file-to-process</code></pre>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh</code></pre>
<p>View the <code>remarks.htm</code> file in your web browser.</p>
<p>The result is best viewed in a 80x25 console with ANSI colors.</p>
<h2 id="try-windows">Try (Windows):</h2>
<pre><code> copy header.htm hou.htm /y
hou html.txt hou.c &gt;&gt; hou.htm
start hou.htm</code></pre>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>What a versatile entry! It can be used to check the size of IOCCC entries <em>and</em>
to publish them as HTML.</p>
<p>For extra credit: what is the meaning of the number <code>2321237</code>?</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<h3 id="disclaimer">Disclaimer</h3>
<p>The reviewer may have already noticed that the 2nd page of this program is a
dense blob, which is discouraged by the contest rules. We wish to point out that
a majority of state-of-art programming editors support syntax highlighting,
which should be enabled when reading this entry. Anticipating that the
reviewer’s preferred color setting may produce a suboptimal visual effect, a few
syntax files is provided to highlight the source code under an author-provided
setting, using the submitted program itself. Syntax highlighting would also
visually improve the 3rd page.</p>
<p>The code may throw a few warnings due to formatting constraints. The author did
try to remove warnings under gcc and Visual Studio, though.</p>
<p>The author does not own the original anime series where the embedded ASCII arts
come from. For comparison, original non-ASCII art depictions of the relevant
characters and objects can be found by googling the embedded text messages.</p>
<h3 id="syntax-files">Syntax files</h3>
<p>The syntax file consists of a number of rewriting rules. Each rule consists of a
regular expression, a space, a format string, and a newline. All text matching
the regular expression would be replaced by the format string. In case of a
conflict, rules appearing earlier would take precedence. One can refer to the
original text in the format string using <code>%s</code>. Other <code>%</code> characters in the
format string must be escaped with another <code>%</code>. The space character can be used
in the regular expression by escaping it with <code>[]</code> or <code>""</code>.</p>
<p>The following regular expression operators are supported:</p>
<pre><code> () [] * + ? | &quot;&quot;</code></pre>
<p>For example, one can use the following expression to match a certain declaration
statement in <a href="https://github.com/ioccc-src/winner/blob/master/2012/hou/hou.c">hou.c</a>:</p>
<pre><code> &quot;char&quot;[ *]*[a-zA-Z_][0-9a-zA-Z_]*[ ]*((=[0-9a-zA-Z_ ]+)|(\[[0-9a-zA-Z_ ]*\]))?[ ]*(,[ *]*[a-zA-Z_][0-9a-zA-Z_]*[ ]*((=[0-9a-zA-Z_ ]+)|(\[[0-9a-zA-Z_ ]*\]))?[ ]*)*;</code></pre>
<p>The regex engine is also algorithmically efficient. To illustrate the point,
<a href="ansi.txt">ansi.txt</a> contains a pathological expression <a href="#fn1" class="footnote-ref" id="fnref1" role="doc-noteref"><sup>1</sup></a> that guarantees a
hang for the competing Perl engine while matching itself. Try to compare these
two engines:</p>
<pre><code> ./hou ansi.txt ansi.txt
perl patho.pl &lt; ansi.txt</code></pre>
<h3 id="limitations">Limitations</h3>
<p>Finally, there are a few limitations…</p>
<ul>
<li>The only escape sequence supported is <code>\n</code> and it doesn’t work in <code>[]</code>.</li>
<li>The maximum file/rule size is a linear function of the hard-coded constant <code>M</code>.</li>
<li>Single-character matches at the end of file may be missed.</li>
<li>The operator <code>|</code> doesn’t obey precedence rules and some extra <code>()</code>s may be required.</li>
<li>Incorrect syntax files are not tolerated.</li>
<li>The program relies on ASCII.</li>
</ul>
<h3 id="why-obfuscated">Why obfuscated</h3>
<p>The first layer of obfuscation comes from the challenge of embedding a large
ASCII art in a dense blob. The entire art is composed using only keywords,
strings and character constants. That results in a number of otherwise useless
<code>#define</code>s and quite a number of unconventionally written constants. While the
preprocessor may remove the former, the later would remain regardless of
beautification and preprocessing.</p>
<p>The second layer of obfuscation comes from the need to squeeze a reasonably
powerful regex engine into the remaining area that isn’t occupied by excessive
keywords and useless constants. To achieve this, the regex compiler is written
using the same threaded virtual machine <a href="#fn2" class="footnote-ref" id="fnref2" role="doc-noteref"><sup>2</sup></a> that parses the regex. Due to
compiler limitations, the generated VM code also ends up obscured by a large
amount of spaghetti branches and virtual thread creations. Finally, the VM in
<a href="#fn3" class="footnote-ref" id="fnref3" role="doc-noteref"><sup>3</sup></a> is extended to track multiple expression matches for the actual formatting.</p>
<p>As an extra tweak, the text message actually does something useful. Remove the
“Make a contract with me” catch line and the program would cease to function.</p>
<h3 id="references">References</h3>
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<section id="footnotes" class="footnotes footnotes-end-of-document" role="doc-endnotes">
<h5>Footnotes</h5>
<ol>
<li id="fn1"><p><a href="http://swtch.com/~rsc/regexp/regexp1.html">Regular Expression Matching Can Be Simple And Fast (but is slow in Java, Perl, PHP, Python, Ruby, …)</a><a href="#fnref1" class="footnote-back" role="doc-backlink">↩︎</a></p></li>
<li id="fn2"><p><a href="http://swtch.com/~rsc/regexp/regexp2.html">Russ Cox, Regular Expression Matching: the Virtual Machine Approach</a><a href="#fnref2" class="footnote-back" role="doc-backlink">↩︎</a></p></li>
<li id="fn3"><p><a href="http://swtch.com/~rsc/regexp/regexp2.html">Russ Cox, Regular Expression Matching: the Virtual Machine Approach</a><a href="#fnref3" class="footnote-back" role="doc-backlink">↩︎</a></p></li>
</ol>
</section>
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<div id="inventory">
<h1 id="inventory-for-2012hou">Inventory for 2012/hou</h1>
</div>
<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/hou/hou.c">hou.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/hou/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/hou/hou.orig.c">hou.orig.c</a> - original source code</li>
<li><a href="ansi.txt">ansi.txt</a> - sample input with a pathological expression</li>
<li><a href="chk.txt">chk.txt</a> - sample input</li>
<li><a href="hint.html">hint.html</a> - hint document</li>
<li><a href="html.txt">html.txt</a> - sample input</li>
<li><a href="markdown.txt">markdown.txt</a> - sample input</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/hou/patho.pl">patho.pl</a> - perl program - takes a long time to process ansi.txt</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/hou/try.sh">try.sh</a> - script to try entry</li>
<li><a href="header.htm">header.htm</a> - HTML header</li>
<li><a href="perl-notes.txt">perl-notes.txt</a> - time command diff of patho.pl and prog</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="2012_hou.tar.bz2">2012_hou.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/hou/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/hou/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/hou/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/hou/hint.md">hint.md</a> - markdown source for hint.html</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/hou/.path">.path</a> - directory path from top level directory</li>
<li><a href="index.html">index.html</a> - this web page</li>
</ul>
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