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<h1>The International Obfuscated C Code Contest</h1>
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<h2>2012/zeitak - Gold Award - Balanced use of obfuscation</h2>
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<h3>Brace matcher</h3>
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<a class="Left" href="../vik/index.html">← 2012/vik</a>
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/zeitak.c">C code</a>
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F2012%2Fzeitak%2Findex.html">✓</a>
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<h2 id="author">Author:</h2>
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<ul>
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<li>Name: <a href="../../authors.html#Adar_Zeitak">Adar Zeitak</a><br>
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Location: <a href="../../location.html#IL">IL</a> - <em>State of Israel</em> (<em>Israel</em>)</li>
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<h2 id="to-build">To build:</h2>
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<pre><code> make</code></pre>
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<p>There is an alternate version that is slightly deobfuscated. See <a href="#alternate-code">alternate
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code</a> below.</p>
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<h2 id="to-use">To use:</h2>
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<pre><code> ./zeitak < file</code></pre>
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<p>where <code>file</code> is the file to be checked for nesting errors. For example, you may
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||
try <a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/incorrect.1.quote.c">incorrect.1.quote.c</a> and the program itself. You may also run it on
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text files that are not code.</p>
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<h2 id="try">Try:</h2>
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<pre><code> ./try.sh</code></pre>
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<p><strong>NOTE</strong>: the program prints an error and exits on the first nesting error so it
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will not detect multiple issues.</p>
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<h2 id="alternate-code">Alternate code:</h2>
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<p>The alternate code, <a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/zeitak.alt.c">zeitak.alt.c</a>, is a version that was slightly
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deobfuscated by the author. You may find reading it helpful in your attempt to
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understand this extremely subtle entry.</p>
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<h3 id="alternate-build">Alternate build:</h3>
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<pre><code> make alt</code></pre>
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<h3 id="alternate-use">Alternate use:</h3>
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<p>Use <code>zeitak.alt</code> as you would <code>zeitak</code> above.</p>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>This is an extremely subtle and twisted piece of Gold award winning code!</p>
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||
<p>The judges spent a considerable amount of time analyzing this entry.
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||
At one point we spent
|
||
<a href="https://web.archive.org/web/20130925190722/https://twitter.com/ioccc/status/252162898800033792">18
|
||
minutes</a>
|
||
just to understand <em>18 key <strong>characters</strong></em> of this code.</p>
|
||
<p><strong>NOTE</strong>: if you use vim to view the code, make sure to do:</p>
|
||
<pre><code> :set tabstop=4</code></pre>
|
||
<p>in command mode, before looking at the code, to see the correct layout.</p>
|
||
<p>For more help, see the
|
||
FAQ on “<a href="../../faq.html#tabstops">tabstops</a>”.</p>
|
||
<h2 id="authors-remarks">Author’s remarks:</h2>
|
||
<h3 id="nesting-errors-detector">Nesting Errors Detector</h3>
|
||
<h4 id="what-does-it-do">What does it do</h4>
|
||
<p>As you have probably understood by looking at the source*, this program has
|
||
something to do with parenthesis (and equality of opening and closing
|
||
parenthesis, if you look close enough). It goes over the file given to it and
|
||
checks that every opening <code>(</code>, <code>[</code>, or <code>{</code> has a matching closing one and
|
||
vice versa. It also checks that every <code>"</code> or <code>'</code> is closed.</p>
|
||
<p>If an error is detected, an error message will be printed. If the problem
|
||
is a superfluous closing bracket, it will even print a few characters
|
||
around it’s position.</p>
|
||
<p>* Make sure you view the source with 4 spaces tab width.</p>
|
||
<h4 id="features">Features</h4>
|
||
<ul>
|
||
<li>Ignores parenthesis inside strings or character constants, so no errors
|
||
will be detected in the following line:</li>
|
||
</ul>
|
||
<pre><code> printf(")");</code></pre>
|
||
<ul>
|
||
<li>Doesn’t get confused by the <a href="../../1984/anonymous/index.html">1984/anonymous</a> entry!</li>
|
||
</ul>
|
||
<h4 id="mis-features">Mis-Features</h4>
|
||
<ul>
|
||
<li>Escapes (e.g. <code>\"</code>) are ignored, so the following line will produce
|
||
an error:</li>
|
||
</ul>
|
||
<pre><code> printf("\"");</code></pre>
|
||
<h4 id="obfuscation">Obfuscation</h4>
|
||
<p><a href="../../years.html">IOCCC entries</a> already contain entries without digits, control-flow
|
||
keywords and certain operators in their source. This entry has an
|
||
even more limited source, that is:</p>
|
||
<ul>
|
||
<li>Without any digits.</li>
|
||
<li>Without any character constants.</li>
|
||
<li>Without using functions from headers other than <code>stdio</code>.</li>
|
||
<li>Without any control-flow keywords (not even the <code>?:</code> operator).</li>
|
||
<li>Without any arithmetic or logic operators!</li>
|
||
</ul>
|
||
<p>So, what’s left? Parenthesis, and lots of them, as looking at the source will
|
||
reveal immediately. The main obfuscation is building the whole algorithm using
|
||
only function calls, typecasts, array lookups and pointer operators.</p>
|
||
<h4 id="additional-obfuscations-include">Additional obfuscations include:</h4>
|
||
<ul>
|
||
<li>Extensive reuse of identifiers: Macros share names with variables, inner
|
||
curly braces scopes contain variables with names identical to those in the
|
||
outer scopes and some of the variables have different uses in different
|
||
parts of the program. Even the large array has more than one use.</li>
|
||
<li>A complicated data structure with “unused” fields.</li>
|
||
<li>Mostly one-letter identifiers.</li>
|
||
<li>Complex recursion: A function might call itself once, twice, or not at all.</li>
|
||
</ul>
|
||
<h4 id="compilationportabilityrunning-notes">Compilation/Portability/Running Notes</h4>
|
||
<ul>
|
||
<li><p>The program requires <code>char</code> to be one byte and pointers to be
|
||
at least two bytes long.</p></li>
|
||
<li><p>The program was tested on the following platforms:</p>
|
||
<ul>
|
||
<li>Ubuntu 9.04 32-bit with GCC</li>
|
||
<li>Windows 7 32-bit with GCC</li>
|
||
<li>Windows 7 32-bit with OpenWatcom</li>
|
||
</ul></li>
|
||
</ul>
|
||
<!--
|
||
|
||
Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
<!-- AFTER: last line of markdown file: 2012/zeitak/README.md -->
|
||
|
||
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|
||
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|
||
|
||
<!-- START: this line starts content generated by: bin/output-index-inventory.sh -->
|
||
|
||
<div id="inventory">
|
||
<h1 id="inventory-for-2012zeitak">Inventory for 2012/zeitak</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/zeitak.c">zeitak.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/anonymous.alt.c">anonymous.alt.c</a> - alternate source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/anonymous.c">anonymous.c</a> - 1984/anonymous fixed for macOS source</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/zeitak.alt.c">zeitak.alt.c</a> - alternate source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/zeitak.orig.c">zeitak.orig.c</a> - original source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/try.sh">try.sh</a> - script to try entry</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/correct.java">correct.java</a> - example Java source with correct brace (supposedly :-) )</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/incorrect.1.quote.c">incorrect.1.quote.c</a> - example C source with incorrect quotation marks</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/incorrect.3.quotes.c">incorrect.3.quotes.c</a> - example C source with incorrect quotation marks</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/incorrect.brace.c">incorrect.brace.c</a> - example C source with incorrect braces</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/incorrect.bracket.c">incorrect.bracket.c</a> - example C source with incorrect brackets</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/incorrect.java">incorrect.java</a> - example Java source with incorrect braces</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/incorrect.paren.c">incorrect.paren.c</a> - example C source with incorrect parentheses</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/incorrect.quote-esc.c">incorrect.quote-esc.c</a> - example C source with incorrect quotation mark escaped</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/incorrect.single.quote.c">incorrect.single.quote.c</a> - example C source with incorrect single quotation mark</li>
|
||
<li><a href="incorrect.txt">incorrect.txt</a> - example text file with unmatched quote</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="2012_zeitak.tar.bz2">2012_zeitak.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/zeitak/.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/zeitak/.path">.path</a> - directory path from top level directory</li>
|
||
<li><a href="index.html">index.html</a> - this web page</li>
|
||
</ul>
|
||
<hr style="width:10%;text-align:left;margin-left:0">
|
||
<h4>
|
||
Jump to: <a href="#">top</a>
|
||
</h4>
|
||
|
||
<!-- END: next line ends content generated by: bin/output-index-inventory.sh -->
|
||
|
||
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|
||
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|
||
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/after-content.default.html -->
|
||
<!-- START: this line starts content from: inc/footer.inventory.html -->
|
||
|
||
<!--
|
||
|
||
Copyright © 1984-2025 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
|
||
<div class="footer">
|
||
|
||
<div id="copyright"><h3>Copyright © 1984-2025 by Landon Curt Noll:
|
||
<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">Some Rights Reserved</a></h3>
|
||
<p>
|
||
This work is <b>licensed by Landon Curt Noll</b> under
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
|
||
target="_blank"
|
||
rel="license noopener noreferrer"
|
||
style="display:inline-block;">CC BY-SA 4.0</a></b>.
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/cc.png"
|
||
alt="cc inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/by.png"
|
||
alt="person inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/sa.png"
|
||
alt="arrow looping back on itself inside circle symbol"><br>
|
||
You should <b>carefully review</b> the
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">CC BY-SA 4.0 LEGAL CODE</a></b>
|
||
before using the licensed material.<br>
|
||
You may wish to review the
|
||
<b><a href="../../license.html"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
|
||
of <b>CC BY-SA 4.0</b>.<br>
|
||
</p>
|
||
</div>
|
||
|
||
<div id="coda"><h3>Coda</h3>
|
||
<p>
|
||
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F2012%2Fzeitak%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
|
||
<a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a><br>
|
||
</p>
|
||
</div>
|
||
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/footer.inventory.html -->
|
||
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|
||
|
||
</body>
|
||
</html>
|
||
|
||
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|