Landon Curt Noll
5ed453970d
Testing another fix for **Nu HTML check this web page** for constructed entry pages that are not `index.html`. Changed `bin/gen-other-html.sh` VERSION from "1.2 2024-04-21". to "1.2.1 2024-04-21". Ran `make gen_other_html` to perform the above.
241 lines
11 KiB
HTML
241 lines
11 KiB
HTML
<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<link rel="stylesheet" href="../../ioccc.css">
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<link href="https://fonts.googleapis.com/css2?family=Outfit:wght@100..900&display=swap" rel="stylesheet">
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>The International Obfuscated C Code Contest</title>
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<link rel="icon" type="image/x-icon" href="../../favicon.ico">
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<meta name="description" content="spoilers.md for 2015/burton">
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<meta name="keywords" content="IOCCC, 2015/burton, spoilers.md">
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</head>
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<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
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<!-- !!! Do not modify this web page, instead modify the file: 2015/burton/spoilers.md !!! -->
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<body>
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<div class="theader">
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<nav class="topbar">
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<div class="container">
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<div class="logo">
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IOCCC
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Home
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<div class="outfit-font"><a href="../../index.html">IOCCC Home</a></div>
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News
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<div class="outfit-font"><a href="../../news.html">IOCCC News</a></div>
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<div class="outfit-font"><a href="../../next/index.html">Rules and Guidelines</a></div>
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<div class="outfit-font"><a href="../../faq.html#submit">How to enter the IOCCC</a></div>
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Bugs
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<div class="outfit-font"><a href="../../bugs.html">Bugs & (mis)features</a></div>
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<div class="outfit-font"><a href="../../faq.html#fix_an_entry">Fixing IOCCC entries</a></div>
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<div class="outfit-font"><a href="../../faq.html#fix_web_site">Fixing the web site</a></div>
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<div class="outfit-font"><a href="../../faq.html#fix_author">Fixing author info</a></div>
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<div class="outfit-font"><a href="../../thanks-for-help.html">Thanks for the help</a></div>
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</div>
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</div>
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<div class="item">
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<span class="item-header">
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Judges
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</span>
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<div class="sub-item">
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<div class="outfit-font"><a href="../../judges.html">The IOCCC Judges</a></div>
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<div class="outfit-font"><a href="../../contact.html">Contacting the IOCCC</a></div>
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</div>
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</div>
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</nav>
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<div class="header">
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<img src="../../png/ioccc.png" alt="IOCCC image by Matt Zucker" width=300 height=110>
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<h1>The International Obfuscated C Code Contest</h1>
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<h2>spoilers.md for 2015/burton</h2>
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</div>
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<div class="navbar">
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<a class="Left" href="index.html">↑ jump to index.html ↑</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%2F2015%2Fburton%2F">✓</a>
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</div>
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<div class="content" id="content">
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<!-- BEFORE: 1st line of markdown file: 2015/burton/spoilers.md -->
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<h3 id="spoilers">Spoilers</h3>
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<p><code>calc</code> is a recursive-descent parser. It allocates from the stack deep enough
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that all expressions are exhausted before the recursion stack depth reaches the
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allocations. The memory map and source is documented in
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<a href="src.doc.txt">src.doc.txt</a>. Tokens are encoded using values 0-20, where 0 is an
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invalid token, 1 is minus, 2 is space, 3 is plus, etc. The necessary constants
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are derived at the start of the program, using the guarantee that globals are
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initialized to zero; so a correct NULL pointer is obtained from an uninitialized
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global pointer variable, and the integers from uninitialized global <code>int</code>
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variables. If <code>x</code> is a global <code>int</code>, then <code>!x</code> is <code>1</code>, and the derivation
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proceeds from there, using some identities that are confusingly similar and
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interestingly combined (increasing obfuscation):</p>
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<pre><code> obc clr
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--- ---
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-~x x+1
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~-x x-1
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y-~x y+x+1</code></pre>
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<p>The derived constants are a compromise between simple expressions, maximum utility,
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and minimum number of variables used.</p>
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<p>Command line arguments are copied into the upper half of the input buffer,
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separated by a space. This allows the code to have a single input parser by using
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a pointer-to-func to either <code>getchar(3)</code> if live, or a <code>getchar(3)</code> simulator.</p>
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<p>A small amount of obfuscation comes from <code>void</code> functions declared <code>int</code>, but
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missing <code>return</code>. This is necessary to allow these functions in ternary <code>?:</code>
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expressions and paired with <code>&&</code> and <code>||</code>; but the requisite returns would add
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symbol count at no benefit to obscurity or functionality. Function
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decomposition was mostly chosen to avoid curly braces: if a <code>for</code>-loop required
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multiple statements, the body became a new function. Last, but not least:
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sharing state via global variables is an ancient and honored form of
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obfuscation, and remarkably effective.</p>
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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For more information, see:
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https://creativecommons.org/licenses/by-sa/4.0/
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-->
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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For more information, see:
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https://creativecommons.org/licenses/by-sa/4.0/
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-->
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<div class="footer">
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<div id="copyright"><h2>Copyright and CC BY-SA 4.0 License</h2></div>
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<p>All IOCCC content including this file and web page are:</p>
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<b> Copyright © 1984-2024 by Landon Curt Noll. <a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean">Some Rights Reserved</a>.</b>
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<p>This work is licensed by Landon Curt Noll under:</p>
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<p><b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
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target="_blank" rel="license noopener noreferrer" style="display:inline-block;"> CC BY-SA 4.0
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src="../../png/cc.png"
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alt="cc inside circle symbol">
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src="../../png/by.png"
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src="../../png/sa.png"
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alt="arrow looping back on itself inside circle symbol">
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</a></b></p>
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<p>The <b>CC BY-SA 4.0 LEGAL CODE</b> for this license is found under:</p>
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<p> <b><a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en">
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https://creativecommons.org/licenses/by-sa/4.0/legalcode.en</a></b></p>
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<p>You should <b>carefully review</b> all of the terms and conditions of the
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<a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en">actual license</a>
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<p>You may wish to review the <b><a href="../../license.html">highlights of some of the key
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features and terms</a></b> of the <a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en">actual license</a>.</p>
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<h2>Coda</h2>
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<p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2015%2Fburton%2F">Nu HTML check this web page</a></p>
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