Files
ioccc/2015/yang/index.html
T
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

672 lines
24 KiB
HTML
Raw Blame History

This file contains ambiguous Unicode characters
This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<!-- START: two lines up starts content from: inc/top.default.html -->
<!-- END: this line ends content from: inc/top.default.html -->
<!-- START: this line starts content from: inc/head.default.html -->
<head>
<link rel="stylesheet" href="../../ioccc.css">
<link href="https://fonts.googleapis.com/css2?family=Outfit:wght@100..900&display=swap" rel="stylesheet">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
<title>2015/yang - Most pointed reaction</title>
<link rel="icon" type="image/x-icon" href="../../favicon.ico">
<meta name="description" content="2015 IOCCC entry yang - Most pointed reaction">
<meta name="keywords" content="IOCCC, 2015, IOCCC 2015, IOCCC entry, yang, Most pointed reaction">
</head>
<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
<!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
<!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
<!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
<!-- END: this line ends content from: inc/head.default.html -->
<!-- -->
<!-- This web page was formed via the tool: bin/readme2index.sh -->
<!-- The content of main section of this web page came from: 2015/yang/README.md -->
<!-- -->
<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
<!-- !!! Do not modify this web page, instead modify the file: 2015/yang/README.md !!! -->
<!-- !!! Do not modify this web page, instead modify the file: 2015/yang/README.md !!! -->
<!-- !!! Do not modify this web page, instead modify the file: 2015/yang/README.md !!! -->
<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
<!-- Markdown content was converted into HTML via the tool: bin/md2html.sh -->
<!-- START: this line starts content from: inc/body.default.html -->
<body>
<!-- END: this line ends content from: inc/body.default.html -->
<!-- START: this line starts content from: inc/topbar.default.html -->
<div class="theader">
<nav class="topbar">
<div class="container">
<div class="logo">
<a href="../../index.html" class="logo-link">
IOCCC
</a>
</div>
<div class="topbar-items">
<div class="item">
<span class="item-header">
Entries
</span>
<div class="sub-item">
<div class="outfit-font">
<a href="../../years.html" class="sub-item-link">
Winning entries
</a>
</div>
<div class="outfit-font">
<a href="../../authors.html" class="sub-item-link">
Winning authors
</a>
</div>
<div class="outfit-font">
<a href="../../location.html" class="sub-item-link">
Location of authors
</a>
</div>
<div class="outfit-font">
<a href="../../bugs.html" class="sub-item-link">
Bugs and (mis)features
</a>
</div>
<div class="outfit-font">
<a href="../../faq.html#fix_an_entry" class="sub-item-link">
Fixing entries
</a>
</div>
<div class="outfit-font">
<a href="../../faq.html#fix_author" class="sub-item-link">
Updating author info
</a>
</div>
</div>
</div>
<div class="item">
<span class="item-header">
Status
</span>
<div class="sub-item">
<div class="outfit-font">
<a href="../../news.html" class="sub-item-link">
News
</a>
</div>
<div class="outfit-font">
<a href="../../status.html" class="sub-item-link">
Contest status
</a>
</div>
<div class="outfit-font">
<a href="../../next/rules.html" class="sub-item-link">
IOCCC rules
</a>
</div>
<div class="outfit-font">
<a href="../../next/guidelines.html" class="sub-item-link">
IOCCC guidelines
</a>
</div>
<div class="outfit-font">
<a href="../../markdown.html" class="sub-item-link">
Markdown guidelines
</a>
</div>
<div class="outfit-font">
<a href="../../SECURITY.html" class="sub-item-link">
Security policy
</a>
</div>
</div>
</div>
<div class="item">
<span class="item-header">
FAQ
</span>
<div class="sub-item">
<div class="outfit-font">
<a href="../../faq.html" class="sub-item-link">
Frequently asked questions
</a>
</div>
<div class="outfit-font">
<a href="../../quick-start.html#enter" class="sub-item-link">
Enter the IOCCC
</a>
</div>
<div class="outfit-font">
<a href="../../faq.html#compiling" class="sub-item-link">
Compiling entries
</a>
</div>
<div class="outfit-font">
<a href="../../faq.html#running_entries" class="sub-item-link">
Running entries
</a>
</div>
<div class="outfit-font">
<a href="../../faq.html#help" class="sub-item-link">
How to help
</a>
</div>
</div>
</div>
<div class="item">
<span class="item-header">
About
</span>
<div class="sub-item">
<div class="outfit-font">
<a href="../../index.html" class="sub-item-link">
Home page
</a>
</div>
<div class="outfit-font">
<a href="../../social.html" class="sub-item-link">
IOCCC social media
</a>
</div>
<div class="outfit-font">
<a href="../../about.html" class="sub-item-link">
About the IOCCC
</a>
</div>
<div class="outfit-font">
<a href="../../judges.html" class="sub-item-link">
The judges
</a>
</div>
<div class="outfit-font">
<a href="../../thanks-for-help.html" class="sub-item-link">
Thanks for the help
</a>
</div>
<div class="outfit-font">
<a href="../../contact.html" class="sub-item-link">
Contact us
</a>
</div>
</div>
</div>
</div>
</div>
</nav>
<div class="header-mobile-menu">
<noscript>
<a href="../../nojs-menu.html" class="topbar-js-label">
Please Enable JavaScript
</a>
</noscript>
<button id="header-open-menu-button" class="topbar-mobile-menu">
<img
src="../../png/hamburger-icon-open.png"
alt="hamburger style menu icon - open state"
width=48
height=48>
</button>
<button id="header-close-menu-button" class="hide-content">
<img
src="../../png/hamburger-icon-closed.png"
alt="hamburger style menu icon - closed state"
width=48
height=48>
</button>
<div id="mobile-menu-panel" class="hide-content">
<div class="mobile-menu-container">
<div class="mobile-menu-wrapper">
<div class="mobile-menu-item">
Entries
</div>
<div class="mobile-submenu-wrapper">
<a class="mobile-submenu-item" href="../../years.html">
Winning entries
</a>
<a class="mobile-submenu-item" href="../../authors.html">
Winning authors
</a>
<a class="mobile-submenu-item" href="../../location.html">
Location of authors
</a>
<a class="mobile-submenu-item" href="../../bugs.html">
Bugs and (mis)features
</a>
<a class="mobile-submenu-item" href="../../faq.html#fix_an_entry">
Fixing entries
</a>
<a class="mobile-submenu-item" href="../../faq.html#fix_author">
Updating author info
</a>
<a class="mobile-submenu-item" href="../../thanks-for-help.html">
Thanks for the help
</a>
</div>
</div>
<div class="mobile-menu-wrapper">
<div class="mobile-menu-item">
Status
</div>
<div class="mobile-submenu-wrapper">
<a class="mobile-submenu-item" href="../../news.html">
News
</a>
<a class="mobile-submenu-item" href="../../status.html">
Contest status
</a>
<a class="mobile-submenu-item" href="../../next/rules.html">
IOCCC rules
</a>
<a class="mobile-submenu-item" href="../../next/guidelines.html">
IOCCC guidelines
</a>
<a class="mobile-submenu-item" href="../../markdown.html">
Markdown guidelines
</a>
<a class="mobile-submenu-item" href="../../SECURITY.html">
Security policy
</a>
</div>
</div>
<div class="mobile-menu-wrapper">
<div class="mobile-menu-item">
FAQ
</div>
<div class="mobile-submenu-wrapper">
<a class="mobile-submenu-item" href="../../faq.html">
Frequently asked questions
</a>
<a class="mobile-submenu-item" href="../../quick-start.html#enter">
Enter the IOCCC
</a>
<a class="mobile-submenu-item" href="../../faq.html#compiling">
Compiling entries
</a>
<a class="mobile-submenu-item" href="../../faq.html#running_entries">
Running entries
</a>
<a class="mobile-submenu-item" href="../../faq.html#help">
How to help
</a>
</div>
</div>
<div class="mobile-menu-wrapper">
<div class="mobile-menu-item">
About
</div>
<div class="mobile-submenu-wrapper">
<a class="mobile-submenu-item" href="../../index.html">
Home page
</a>
<a class="mobile-submenu-item" href="../../social.html">
IOCCC social media
</a>
<a class="mobile-submenu-item" href="../../about.html">
About the IOCCC
</a>
<a class="mobile-submenu-item" href="../../judges.html">
The judges
</a>
<a class="mobile-submenu-item" href="../../contact.html">
Contact us
</a>
</div>
</div>
</div>
</div>
</div>
</div>
<script>
var headerOpenMenuButton = document.getElementById("header-open-menu-button");
var headerCloseMenuButton = document.getElementById("header-close-menu-button");
var mobileMenuPanel = document.getElementById("mobile-menu-panel");
headerOpenMenuButton.addEventListener("click", () => {
headerOpenMenuButton.classList.remove("topbar-mobile-menu");
headerOpenMenuButton.classList.add("hide-content");
headerCloseMenuButton.classList.remove("hide-content");
headerCloseMenuButton.classList.add("topbar-mobile-menu");
mobileMenuPanel.classList.remove("hide-content");
mobileMenuPanel.classList.add("topbar-mobile-panel");
});
headerCloseMenuButton.addEventListener("click", () => {
headerCloseMenuButton.classList.remove("topbar-mobile-menu");
headerCloseMenuButton.classList.add("hide-content");
mobileMenuPanel.classList.add("hide-content");
mobileMenuPanel.classList.remove("topbar-mobile-panel");
headerOpenMenuButton.classList.add("topbar-mobile-menu");
headerOpenMenuButton.classList.remove("hide-content");
});
</script>
<!-- END: this line ends content from: inc/topbar.default.html -->
<!-- START: this line starts content from: inc/header.default.html -->
<div class="header">
<a href="../../2011/zucker/index.html">
<img src="../../png/ioccc.png"
alt="IOCCC image by Matt Zucker"
width=300
height=110>
</a>
<h1>The International Obfuscated C Code Contest</h1>
<h2>2015/yang - Most pointed reaction</h2>
<h3>text encoder with sea star pattern that varies with C flavor</h3>
</div>
<!-- END: this line ends content from: inc/header.default.html -->
<!-- START: this line starts content from: inc/navbar.mid.html -->
<div class="navbar">
<a class="Left" href="../schweikhardt/index.html">&larr; 2015/schweikhardt</a>
<a class="Left" href="../index.html">&uarr; 2015 &uarr;</a>
<a class="Left" href="../../2018/algmyr/index.html">2018/algmyr &rarr;</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2015/yang/prog.c">C code</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2015/yang/Makefile">Makefile</a>
<a class="Right" href="#inventory">Inventory</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2015/yang/prog.orig.c">Original C</a>
<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F2015%2Fyang%2Findex.html">&#x2713;</a>
</div>
<!-- END: this line ends content from: inc/navbar.mid.html -->
<!-- START: this line starts content from: inc/before-content.default.html -->
<div class="content" id="content">
<!-- END: this line ends content from: inc/before-content.default.html -->
<!-- START: this line starts content for HTML phase 20 by: bin/output-index-author.sh via bin/md2html.sh -->
<!-- START: this line starts content generated by: bin/output-index-author.sh -->
<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>
</ul>
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
<!-- END: this line ends content for HTML phase 20 by: bin/output-index-author.sh via bin/md2html.sh -->
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
<!-- BEFORE: 1st line of markdown file: 2015/yang/README.md -->
<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><strong>NOTE</strong>: 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/winner/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>
<!--
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: 2015/yang/README.md -->
<!-- END: this line ends content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
<!-- START: this line starts content for HTML phase 22 by: bin/output-index-inventory.sh via bin/md2html.sh -->
<!-- START: this line starts content generated by: bin/output-index-inventory.sh -->
<div id="inventory">
<h1 id="inventory-for-2015yang">Inventory for 2015/yang</h1>
</div>
<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/yang/prog.c">prog.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/yang/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/yang/prog.orig.c">prog.orig.c</a> - original source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/yang/try.sh">try.sh</a> - script to try entry</li>
<li><a href="obfuscation.html">obfuscation.html</a> - JavaScript page with full recording of development</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="2015_yang.tar.bz2">2015_yang.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/yang/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/yang/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/yang/.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/2015/yang/.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 -->
<!-- END: this line ends content for HTML phase 22 by: bin/output-index-inventory.sh via bin/md2html.sh -->
<!-- START: this line starts content from: inc/after-content.default.html -->
</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 &copy; 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%2F2015%2Fyang%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 -->
<!-- START: this line starts content from: inc/bottom.default.html -->
</body>
</html>
<!-- END: this line ends content from: inc/bottom.default.html -->