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.
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width=300
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height=110>
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</a>
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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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</div>
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<!-- END: this line ends content from: inc/header.default.html -->
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<div class="navbar">
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<a class="Left" href="../vik/index.html">← vik</a>
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<a class="Left" href="../index.html">↑ 2012 ↑</a>
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<a class="Left Disabled" href="#">last entry</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/zeitak/zeitak.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/zeitak/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
|
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%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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<!-- BEFORE: 1st line of markdown file: 2012/zeitak/README.md -->
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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/temp-test-ioccc/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>NOTE: 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/temp-test-ioccc/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
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<a href="https://web.archive.org/web/20130925190722/https://twitter.com/ioccc/status/252162898800033792">18
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||
minutes</a>
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just to understand <em>18 key <strong>characters</strong></em> of this code.</p>
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<p>NOTE: if you use vim to view the code, make sure to do:</p>
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<pre><code> :set tabstop=4</code></pre>
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<p>in command mode, before looking at the code, to see the correct layout. For more
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||
help see [<a href="../../faq.html#faq6_14">6.14 - How do I set certain tabstops for viewing source code in
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vi(m)?</a></p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<h3 id="nesting-errors-detector">Nesting Errors Detector</h3>
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<h4 id="what-does-it-do">What does it do</h4>
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<p>As you have probably understood by looking at the source*, this program has
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something to do with parenthesis (and equality of opening and closing
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parenthesis, if you look close enough). It goes over the file given to it and
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checks that every opening <code>(</code>, <code>[</code>, or <code>{</code> has a matching closing one and
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vice versa. It also checks that every <code>"</code> or <code>'</code> is closed.</p>
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<p>If an error is detected, an error message will be printed. If the problem
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is a superfluous closing bracket, it will even print a few characters
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around it’s position.</p>
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<p>* Make sure you view the source with 4 spaces tab width.</p>
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<h4 id="features">Features</h4>
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<ul>
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<li>Ignores parenthesis inside strings or character constants, so no errors
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will be detected in the following line:</li>
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</ul>
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<pre><code> printf(")");</code></pre>
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<ul>
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<li>Doesn’t get confused by the <a href="../../1984/anonymous/index.html">1984/anonymous</a> entry!</li>
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</ul>
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<h4 id="mis-features">Mis-Features</h4>
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<ul>
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<li>Escapes (e.g. <code>\"</code>) are ignored, so the following line will produce
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an error:</li>
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</ul>
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<pre><code> printf("\"");</code></pre>
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<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/
|
||
|
||
-->
|
||
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|
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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/temp-test-ioccc/blob/master/2012/zeitak/zeitak.c">zeitak.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/zeitak/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/zeitak/anonymous.alt.c">anonymous.alt.c</a> - alternate source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/zeitak/anonymous.c">anonymous.c</a> - 1984/anonymous fixed for macOS source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/zeitak/zeitak.alt.c">zeitak.alt.c</a> - alternate source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/zeitak/zeitak.orig.c">zeitak.orig.c</a> - original source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/zeitak/try.sh">try.sh</a> - script to try entry</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/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/temp-test-ioccc/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/temp-test-ioccc/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/temp-test-ioccc/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/temp-test-ioccc/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/temp-test-ioccc/blob/master/2012/zeitak/incorrect.java">incorrect.java</a> - example Java source with incorrect braces</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/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/temp-test-ioccc/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/temp-test-ioccc/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/temp-test-ioccc/blob/master/2012/zeitak/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/2012/zeitak/.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/2012/zeitak/.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/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>
|
||
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||
</div>
|
||
|
||
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|
||
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|
||
|
||
<!--
|
||
|
||
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/
|
||
|
||
-->
|
||
|
||
<div class="footer">
|
||
|
||
<div id="copyright"><h3>Copyright © 1984-2024 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%2Fioccc-src.github.io%2Ftemp-test-ioccc%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>
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