The navigation bar for a winning entry now has a "_Original C_" link
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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>1991/davidguy - Best X11 graphics</h2>
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<h3>plays life on a root window w/o Xlib nor include files</h3>
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</div>
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<a class="Left" href="../cdupont/index.html">← 1991/cdupont</a>
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<a class="Left" href="../dds/index.html">1991/dds →</a>
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1991/davidguy/davidguy.c">C code</a>
|
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|
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1991/davidguy/davidguy.orig.c">Original C</a>
|
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F1991%2Fdavidguy%2Findex.html">✓</a>
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<h2 id="author">Author:</h2>
|
||
<ul>
|
||
<li>Name: <a href="../../authors.html#David_Applegate">David Applegate</a><br>
|
||
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
|
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<!-- BEFORE: 1st line of markdown file: 1991/davidguy/README.md -->
|
||
<h2 id="to-build">To build:</h2>
|
||
<pre><code> make all</code></pre>
|
||
<h2 id="to-use">To use:</h2>
|
||
<pre><code> ./davidguy ip_address:server.screen</code></pre>
|
||
<p>where <code>ip_address</code> in an IP address of an X server.</p>
|
||
<h2 id="try">Try:</h2>
|
||
<pre><code> ./davidguy 127.0.0.1:0.0</code></pre>
|
||
<p>Of course, you may need to supply a more reasonable address. :-)</p>
|
||
<h2 id="also-try">Also try:</h2>
|
||
<pre><code> cp -f davidguy guydavid
|
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./guydavid 127.0.0.1:0.0</code></pre>
|
||
<p>Can you determine why this makes a difference?</p>
|
||
<h2 id="judges-remarks">Judges’ remarks:</h2>
|
||
<p>We permitted this type of entry to win because:</p>
|
||
<ul>
|
||
<li>it did not require X to be on the host system</li>
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<li>both BSD and SVR4 have sockets</li>
|
||
</ul>
|
||
<p>Now that X11 and sockets have become ‘standard’, we plan to open
|
||
up the contest to programs that use them. Future rules will
|
||
explain this further.</p>
|
||
<p>We are pleased that this entry has helped bring new ‘life’ into
|
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the contest.</p>
|
||
<h2 id="authors-remarks">Authors’ remarks:</h2>
|
||
<p>The program is a fully-functional X client. It talks directly to
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the X server through a socket without using Xlib, Xt or any other
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||
wussy toolkit junk. With no arguments, it will try to run
|
||
locally using the unix-domain socket (only on BSD :-( ) or you can
|
||
give it a command line argument identifying a display host address
|
||
(in dotted octet notation, like 127.0.0.1:0.0) where the X server
|
||
is running. It handles color and monochrome displays, and
|
||
performs whatever byte-swapping and bit-reversal is needed (so
|
||
that the program works even when the server and the client have
|
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different architectures). It buffers communication to the X
|
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server for efficiency.</p>
|
||
<p><strong>NOTE</strong>: The original source in davidguy.c used only an IP address
|
||
argument (assumed :0.0) and assumed the color of black
|
||
and white.</p>
|
||
<p>The program doesn’t require any user interaction; you can just sit
|
||
back and watch it run. All the action takes place in the root
|
||
window of the display.</p>
|
||
<p>We think the program is interesting for these reasons:</p>
|
||
<ol type="1">
|
||
<li><p>It belongs to a class of programs that programmers make the following
|
||
complaints about: they require a mountain of code to implement even the
|
||
simplest program; and they must be linked with giant libraries of
|
||
hard-to-understand functions. In contrast to these complaints (made by wimps,
|
||
in our humble opinion), our program fits in under 1536 bytes, doesn’t need any
|
||
external functions except for a few system calls, and doesn’t need to include
|
||
any header files.</p></li>
|
||
<li><p>It implements an extremely efficient algorithm for the computation it
|
||
performs. One cool feature of the algorithm (at least as far as this contest is
|
||
concerned) is that its obscurity is fundamentally necessary for its efficiency.
|
||
In other words, even if we took steps to present the algorithm clearly, (we
|
||
haven’t) the relation of the computation performed to the specification of what
|
||
the program was supposed to do would still be hard to understand.</p></li>
|
||
</ol>
|
||
<h3 id="notice-to-those-who-wish-for-a-greater-challenge">NOTICE to those who wish for a greater challenge:</h3>
|
||
<p><strong>If you want a greater challenge, don’t read any further</strong>:
|
||
just try to understand the program via the source.</p>
|
||
<p>If you get stuck, come back and read below for additional hints and information.</p>
|
||
<h3 id="how-this-entry-works">How this entry works:</h3>
|
||
<p>The program plays <a href="https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life">Conway’s Game of
|
||
Life</a> in the root window’s
|
||
background pixmap. It starts by setting the background to random
|
||
bits, and then plays Life, with one Life cell for each pixel of the
|
||
screen. In the game of Life, a cell survives to the next round if
|
||
2 or 3 of its 8 neighbors are also alive, and a cell is born if
|
||
exactly 3 of its neighbors are alive. Otherwise, a cell dies of
|
||
exposure if it has only 0 or 1 neighbors, and dies of overcrowding
|
||
if it has 4 or more neighbors.</p>
|
||
<p>The algorithm used to compute the next generation is based on the
|
||
observation that a cell’s state in the next generation is a boolean
|
||
function of its current state, and the states of its 8 neighbors
|
||
(i.e., a boolean function from 9 bits to 1 bit). This function can
|
||
be computed by a boolean circuit. In addition, intermediate values
|
||
computed by the circuit can be shared between neighboring cells,
|
||
reducing the number of gates per cell required. These ideas
|
||
have been used before, to compute the next generation through a
|
||
series of <a href="https://en.wikipedia.org/wiki/Bit_blit">bit blits</a>.</p>
|
||
<p>Instead of doing this, we map values in the circuit to bits in registers, so
|
||
that the next generation can be computed efficiently within registers,
|
||
minimizing memory access. As a result, the computation of the next generation
|
||
is performed with about 1.6 instructions per life cell, consisting of .125
|
||
memory accesses, .17 shifts, and 1.3 logic operations. The net result is that
|
||
the time to transfer the bits to the X server, and for the X server to draw them
|
||
on the screen, dominates the time to compute the next generation.</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: 1991/davidguy/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-1991davidguy">Inventory for 1991/davidguy</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/davidguy/davidguy.c">davidguy.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/davidguy/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/davidguy/davidguy.orig.c">davidguy.orig.c</a> - original source code</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="1991_davidguy.tar.bz2">1991_davidguy.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/davidguy/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/davidguy/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/davidguy/.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/1991/davidguy/.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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|
||
|
||
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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%2F1991%2Fdavidguy%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>
|
||
|
||
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||
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|
||
|
||
</body>
|
||
</html>
|
||
|
||
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|