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.
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width=300
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</a>
|
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<h1>The International Obfuscated C Code Contest</h1>
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<h2>2001/kev - Best curses game</h2>
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<h3>A Pong game across network</h3>
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</div>
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<div class="navbar">
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<a class="Left" href="../jason/index.html">← 2001/jason</a>
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<a class="Left" href="../index.html">↑ 2001 ↑</a>
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<a class="Left" href="../ollinger/index.html">2001/ollinger →</a>
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2001/kev/kev.c">C code</a>
|
||
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2001/kev/Makefile">Makefile</a>
|
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<a class="Right" href="#inventory">Inventory</a>
|
||
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2001/kev/kev.orig.c">Original C</a>
|
||
<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F2001%2Fkev%2Findex.html">✓</a>
|
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</div>
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<h2 id="author">Author:</h2>
|
||
<ul>
|
||
<li>Name: <a href="../../authors.html#Kevin_Pulo">Kevin Pulo</a><br>
|
||
Location: <a href="../../location.html#AU">AU</a> - <em>Commonwealth of Australia</em> (<em>Australia</em>)</li>
|
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</ul>
|
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||
<!-- BEFORE: 1st line of markdown file: 2001/kev/README.md -->
|
||
<h2 id="to-build">To build:</h2>
|
||
<pre><code> make</code></pre>
|
||
<p>There is another version which lets you use the arrow keys rather than the more
|
||
awkward <code>,</code> and <code>.</code> keys. See <a href="#alternate-code">Alternate code</a> below.</p>
|
||
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
|
||
<p>The current status of this entry is:</p>
|
||
<blockquote>
|
||
<p><strong>STATUS: INABIAF - please DO NOT fix</strong></p>
|
||
</blockquote>
|
||
<p>For more detailed information see <a href="../../bugs.html#2001_kev">2001/kev in bugs.html</a>.</p>
|
||
<h2 id="to-use">To use:</h2>
|
||
<pre><code> ./kev # in one terminal
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./kev hostname # in another terminal</code></pre>
|
||
<p><strong>NOTE</strong>: each player’s paddle is at the bottom and the opponent at the top.</p>
|
||
<h2 id="try">Try:</h2>
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||
<pre><code> ./kev # in one terminal
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./kev localhost # in another terminal on the same host</code></pre>
|
||
<p>If you need to change the speed you can reconfigure it like (say
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for over a network and not the same host):</p>
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||
<pre><code> make clobber SPEED=50 all # original default value which is very fast</code></pre>
|
||
<p>If you wish to change the port you can do so like:</p>
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||
<pre><code> make clobber PORT=3773 all</code></pre>
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||
<p>Of course if you want a port < 1024 you’ll need to be root so don’t do that.</p>
|
||
<p>And if you know what you’re doing you can redefine the call to the <code>socket(2)</code>
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syscall with the <code>l_</code> macro, changing the <code>L</code> variable like one would <code>PORT</code>. Of
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||
course you can do more than one at the same time. For instance to change the
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speed and port:</p>
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||
<pre><code> make clobber SPEED=512 PORT=3773 all</code></pre>
|
||
<p>If you have <code>xterm</code> try on one system:</p>
|
||
<pre><code> xterm -geometry 80x40 -fg green -bg black -fn 9x15bold -e ./kev &</code></pre>
|
||
<p>and then the other, the client system:</p>
|
||
<pre><code> xterm -geometry 80x40 -fg green -bg black -fn 9x15bold -e ./kev localhost&</code></pre>
|
||
<p>This might look nicer than just the terminal itself.</p>
|
||
<h2 id="alternate-code">Alternate code:</h2>
|
||
<p>This version allows you to use arrow keys on the keyboard rather than the more
|
||
awkward <code>,</code> and <code>.</code> keys to move your paddle.</p>
|
||
<h3 id="alternate-build">Alternate build:</h3>
|
||
<pre><code> make alt</code></pre>
|
||
<p>You can reconfigure the macros described above in the same way.</p>
|
||
<h3 id="alternate-use">Alternate use:</h3>
|
||
<p>Use <code>kev.alt</code> as you would <code>kev</code>.</p>
|
||
<p>What happens if you use both, one in one terminal and the other in another
|
||
terminal?</p>
|
||
<h3 id="alternate-try">Alternate try:</h3>
|
||
<p>If you have <code>xterm</code> try on one system:</p>
|
||
<pre><code> xterm -geometry 80x40 -fg green -bg black -fn 9x15bold -e ./kev.alt &</code></pre>
|
||
<p>and then the other, the client system:</p>
|
||
<pre><code> xterm -geometry 80x40 -fg green -bg black -fn 9x15bold -e ./kev.alt localhost&</code></pre>
|
||
<h2 id="judges-remarks">Judges’ remarks:</h2>
|
||
<p>Continuing with this year’s “retro game” theme, this is another old game;
|
||
arguably, one of the oldest. Requires a functioning network, and curses.</p>
|
||
<p>The graphics aren’t the impressive part; the graphics and network are.
|
||
How many games come out at $50 and still require you to wait for a patch
|
||
to come out before you can play multiplayer? This one works out of the
|
||
box.</p>
|
||
<h2 id="authors-remarks">Author’s remarks:</h2>
|
||
<p><strong>NETWORK PONG!</strong></p>
|
||
<h3 id="requirements">REQUIREMENTS</h3>
|
||
<ul>
|
||
<li>TCP sockets</li>
|
||
<li>curses</li>
|
||
<li><code>usleep(3)</code></li>
|
||
</ul>
|
||
<h3 id="description">DESCRIPTION</h3>
|
||
<p>This program is a two-player networked version of the eighties arcade classic,
|
||
<a href="https://en.wikipedia.org/wiki/Pong">Pong</a>. It uses standard TCP sockets to
|
||
communicate over the net, and <code>ncurses</code> for display. It supports variable
|
||
terminal sizes (though both players must have the same terminal size) and game
|
||
speeds. Each player has a paddle to hit the ball, and you get points for
|
||
getting the ball past your opponent’s paddle. It’s pretty fun! :)</p>
|
||
<h3 id="running">RUNNING</h3>
|
||
<p>Run the server first without any command line arguments, i.e.</p>
|
||
<pre><code> ./kev</code></pre>
|
||
<p>Then run the client with a single command line argument which is
|
||
the name of the machine running the server, e.g.</p>
|
||
<pre><code> ./kev localhost</code></pre>
|
||
<p>Make sure that the terminals on both ends are the same size. Also, the TCP port
|
||
number (by default 5455) specified in the <a href="https://github.com/ioccc-src/winner/blob/master/2001/kev/Makefile">Makefile</a> mustn’t be
|
||
blocked by a firewall.</p>
|
||
<p>Here’s a good quick example to see it in action on your own
|
||
machine, assuming you have <code>Xwindows</code>:</p>
|
||
<pre><code> xterm -geometry 80x40 -fg green -bg black -fn 9x15bold -e ./kev &
|
||
xterm -geometry 80x40 -fg green -bg black -fn 9x15bold -e ./kev localhost&</code></pre>
|
||
<h3 id="playing">PLAYING</h3>
|
||
<p>Your paddle is the one at the bottom of the screen, your opponent
|
||
is at the top. To move your paddle left, hold down <code>,</code> (i.e. <code><</code>
|
||
but don’t press shift). To move your paddle right, hold down <code>.</code>.
|
||
To quit, either player may press <code>q</code>.</p>
|
||
<p>The current score is shown on the left side of the halfway line.
|
||
Your score is the lower number, your opponents score is the upper
|
||
number. Your score is the number of times your opponent has
|
||
missed the ball.</p>
|
||
<p>You can control the speed of the ball by the motion of your paddle
|
||
when the ball hits it. If your paddle is still, then the ball
|
||
just bounces normally off it. If your paddle is moving in the
|
||
same direction as the ball, then the ball’s speed in that
|
||
direction will increase. If your paddle is moving in the opposite
|
||
direction to the ball, then the ball’s speed in that direction
|
||
will decrease (or if the ball is going slowly enough, it’ll turn
|
||
around).</p>
|
||
<p>You might want to increase your keyboard repeat rate before
|
||
playing. On the Linux console try <code>kbdrate -r 24.0 -d 250</code>
|
||
(<code>kbdrate</code> might be “hidden” from normal users in <code>/sbin</code>, and you
|
||
might need to be root anyway), in <code>Xwindows</code> try <code>xset r rate 250 24</code> (find out your current rate first with <code>xset q</code>, so that you
|
||
can reset it later).</p>
|
||
<p>Look below in the Building section for info on how to speed up or
|
||
slow down the game (useful if you increase or decrease the
|
||
terminal size).</p>
|
||
<h3 id="building">BUILDING</h3>
|
||
<p>Just run <code>make</code> to use the Makefile as above. The <code>SPEED</code> variable in the
|
||
Makefile controls the speed of the game (defaults to <code>50</code>). This speed is the
|
||
delay between frames in milliseconds. Thus a value of 0 will make the game go
|
||
as fast as your network can handle, and values less than 50 are useful for
|
||
larger terminals or more exciting games. The program needs bandwidth equal to
|
||
1/s bytes per second (where <code>s</code> is the speed value). Any latency on the network
|
||
will be added to <code>s</code> - so you should probably subtract any latency from the
|
||
value of <code>s</code> you want to have. Given that <code>loopback</code> and fast Ethernet LANs are
|
||
both much less than 1ms of latency, you should only need to worry about this if
|
||
you plan on playing over a slower link like a cable modem, DSL, or (God-forbid)
|
||
dial-up.</p>
|
||
<p>The TCP port to use for network communications is specified by the
|
||
<code>PORT</code> variable in the Makefile. If the default of <code>5455</code> is
|
||
blocked for whatever reason, you can change it to something else.
|
||
Of course if you use a port < 1024, you’ll need to be root.</p>
|
||
<h3 id="obfuscation">OBFUSCATION</h3>
|
||
<p>The program’s broad structure is fairly straightforward, but
|
||
individual tasks are rarely done in a straightforward manner. ;)</p>
|
||
<p>Identifier names have mostly been chosen to resemble paddles and
|
||
balls, and to generally decrease readability.</p>
|
||
<p>The source has been cleverly formatted to resemble one of the
|
||
paddles from the game, rotated 90 degrees. ;) (The “source
|
||
paddle” has approximately the same aspect ratio as the game at 80
|
||
columns wide, which is 1:10.)</p>
|
||
<p>Finally, the number of “non-whitespace characters” (as defined by
|
||
the rules) in the file is exactly 2048, which I think is rather
|
||
unexpectedly cool. :)</p>
|
||
<h3 id="bugs">BUGS</h3>
|
||
<p>There are 3 warnings when I compile with gcc 2.95.3 (<code>-Wall -ansi -pedantic</code>) on my Linux system, but all are completely harmless.</p>
|
||
<p>I don’t like the curses and/or termcaps/terminfos on IRIX and
|
||
Solaris (the only two non-Linux systems I have access to).
|
||
Despite calling <code>timeout(0);</code>, <code>notimeout(win, TRUE);</code>, <code>nodelay(win, TRUE);</code> and/or <code>keypad(win, FALSE);</code>, it still seems to force a delay
|
||
into calls to <code>getch()</code> - I’m guessing at a termcap/terminfo level.
|
||
At any rate, I can’t seem to force no delay. This is a shame,
|
||
because it basically plays havoc with the input code, particularly
|
||
the read-ahead canceller. It still works, but not nearly as well
|
||
(key presses are dodgy and holding down keys doesn’t always work),
|
||
and so I <em>much</em> prefer and recommend Linux <code>libncurses</code>.</p>
|
||
<p>Sometimes when <code>q</code> is pressed in one, the other will crash out
|
||
with <code>Broken pipe</code>.</p>
|
||
<p>If the specified port can’t be bound or connected to, the program
|
||
segfaults.</p>
|
||
<p>If your terminal is too wide (we’re talking gigantic here - over
|
||
500 characters wide) then the program can segfault. It’s also
|
||
possible to crash the program a player scores over a billion
|
||
points (1e9). Maybe you can consider that the goal… ;)</p>
|
||
<p>If you run the client and server on different architectures, both
|
||
architectures need to have the same character systems (i.e. don’t
|
||
try mixing ASCII and EBCDIC). It is independent of endianness
|
||
though.</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/
|
||
|
||
-->
|
||
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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-2001kev">Inventory for 2001/kev</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2001/kev/kev.c">kev.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2001/kev/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2001/kev/kev.alt.c">kev.alt.c</a> - alternate source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2001/kev/kev.orig.c">kev.orig.c</a> - original source code</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="2001_kev.tar.bz2">2001_kev.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2001/kev/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2001/kev/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2001/kev/.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/2001/kev/.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 -->
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||
<!-- START: this line starts content from: inc/footer.inventory.html -->
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||
|
||
<!--
|
||
|
||
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%2F2001%2Fkev%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>
|
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</div>
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</div>
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</body>
|
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|
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