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<h1>The International Obfuscated C Code Contest</h1>
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<h2>2019/duble - Best collaborative graphics</h2>
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<h3>Collaborative graphics editor</h3>
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</div>
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<a class="Left" href="../dogon/index.html">← 2019/dogon</a>
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<a class="Left" href="../index.html">↑ 2019 ↑</a>
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<a class="Left" href="../endoh/index.html">2019/endoh →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/prog.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/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%2F2019%2Fduble%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#Etienne_Duble">Etienne Duble</a><br>
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Location: <a href="../../location.html#FR">FR</a> - <em>French Republic</em> (<em>France</em>)</li>
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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, the original, which does not work well in macOS.
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See <a href="#alternate-code">Alternate code</a> below if you are curious.</p>
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<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
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<p>The current status of this entry is:</p>
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<blockquote>
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<p><strong>STATUS: INABIAF - please DO NOT fix</strong></p>
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||
</blockquote>
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<p>For more detailed information see <a href="../../bugs.html#2019_duble">2019/duble in bugs.html</a>.</p>
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<h2 id="to-use">To use:</h2>
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<pre><code> ./prog file</code></pre>
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<h2 id="try">Try:</h2>
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<pre><code> ./prog /tmp/drawing</code></pre>
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<p>Open another window / terminal.</p>
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<pre><code> ./prog /tmp/drawing</code></pre>
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<p>Open more terminals and repeat…</p>
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<p>You might also wish to try a full screen size. For this try:</p>
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<pre><code> make clobber fullscreen</code></pre>
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<p>Alternatively, if you want to change the size, do something like:</p>
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<pre><code> make clobber LINES=20 COLUMNS=20 all</code></pre>
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<p>The author provided us with the following table for use:</p>
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<hr style="width:10%;text-align:left;margin-left:0">
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<ul>
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<li><strong>Arrow keys</strong>: move cursor.</li>
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<li><code>p</code> key: enter <em>pen</em> mode (type <strong>p</strong> again to return to the default <em>move</em>
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mode).</li>
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<li><code>l</code> key: enter <em>line</em> mode (type <strong>l</strong> again to validate the line and return
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to the <em>move</em> mode).</li>
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<li><code>c</code> key: cycle through a small set of different <em>colors</em>.</li>
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<li><code>q</code> key: quit the editor. The drawing is automatically saved.</li>
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</ul>
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<p>The mode and current color is indicated at the bottom left corner of
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the editor.</p>
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<p>After editing the file and quitting, try:</p>
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<pre><code> /tmp/drawing</code></pre>
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<p>i.e. execute the file.</p>
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<hr style="width:10%;text-align:left;margin-left:0">
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<p>WARNING: if the file is deleted it might lock any session still in use. These
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will have to be killed from another shell session or by closing the terminal tab
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(in other words don’t do this from the console!). If the file cannot be opened
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in the beginning this will also happen. This is discussed in
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||
<a href="../../bugs.html#2019_duble">2019/duble in bugs.html</a>.</p>
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||
<p><strong>NOTE</strong>: this entry might leave sockets lying about in the current working
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directory which you’ll have to delete manually. This is also discussed in
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<a href="../../bugs.html#2019_duble">2019/duble in bugs.html</a>.</p>
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<h2 id="alternate-code">Alternate code:</h2>
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<p>An alternate version of this entry, <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/prog.alt.c">prog.alt.c</a>, is provided. This
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alternate code might not work as well in macOS.</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>prog.alt</code> as you would <code>prog</code> above.</p>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>After starting the program, use the cursor keys, then try some modes, like <code>p</code>
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or <code>l</code> (they toggle).</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<h3 id="introduction">Introduction:</h3>
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<p>This program is a <strong>graphics editor</strong>, running in the terminal.</p>
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<p>It provides <strong>collaborative</strong> features: one can join the drawing session
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of someone else by just opening the same file!</p>
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<h3 id="getting-started">Getting started:</h3>
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<p>The program can run on Linux, FreeBSD, macOS, and in most terminals.
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See section <a href="#limits-portability">Limits, Portability</a> for more info.</p>
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||
<p>To build, type <code>make</code> (assuming gcc) or <code>make CC=clang</code>.</p>
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<p>Then you can start the program. It expects a file path as its first argument:</p>
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<pre><code> ./prog /tmp/drawing</code></pre>
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<p>(If not started this way, with a file, <code>prog</code> will refuse to start.)</p>
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||
<p>If the file does not exist, you will start with a blank drawing.</p>
|
||
<p>If someone else (or another <em>instance of yourself</em>, maybe?) is already
|
||
editing this file, you will join the session!</p>
|
||
<h3 id="edit-features">Edit features:</h3>
|
||
<ul>
|
||
<li><strong>arrow keys</strong>: move cursor.</li>
|
||
<li><code>p</code> key: enter <em>pen</em> mode (type <strong>p</strong> again to return to the default <em>move</em> mode).</li>
|
||
<li><code>l</code> key: enter <em>line</em> mode (type <strong>l</strong> again to validate the line and return to the <em>move</em> mode).</li>
|
||
<li><code>c</code> key: cycle through a small set of different <em>colors</em>.</li>
|
||
<li><code>q</code> key: quit the editor. The drawing is automatically saved.</li>
|
||
</ul>
|
||
<p>The mode and current color is indicated at the bottom left corner of
|
||
the editor.</p>
|
||
<h3 id="bonus-features">Bonus features:</h3>
|
||
<ul>
|
||
<li>If you just want to display the content of a drawing file, you do not
|
||
need to start the editor. Just <strong>execute the drawing file</strong>: <code>./<the-file></code>.
|
||
(This will fail if someone is still editing the file, though.)</li>
|
||
<li><code>ls --color <drawing-files...></code> will probably select different colors
|
||
to indicate whether a drawing file is being edited or not. :-)</li>
|
||
</ul>
|
||
<h3 id="obfuscation">Obfuscation:</h3>
|
||
<p>You will probably have a hard time analyzing this entry, because:</p>
|
||
<ul>
|
||
<li>Analyzing a system made of several communicating programs is known to
|
||
be a complex task. (And if you think that observing a single-user drawing
|
||
session will be a good starting point, read on.)</li>
|
||
<li>Code coverage of single vs multi-user sessions is more or less the same. :-)</li>
|
||
<li>Code coverage when using <em>move</em>, <em>pen</em> or <em>line</em> modes is almost the same.
|
||
(so, is there a Bresenham algorithm somewhere??)</li>
|
||
<li>Some OS resource values and <code>stdlib.h</code> call results are inferred.</li>
|
||
<li>Whenever possible, variable names are reused.</li>
|
||
<li>You might start analyzing escape code sequences right now, but warming up
|
||
your brain is actually recommended. Start with a simple question such as:
|
||
<em>in inverse video mode, will a space char show the foreground color or
|
||
background color?</em></li>
|
||
</ul>
|
||
<h3 id="a-few-more-things">A few more things:</h3>
|
||
<p>Did you notice the <code>enum</code> declaration? Could it be just an <code>int</code> or <code>const int</code>
|
||
variable, instead?</p>
|
||
<p>If your keyboard has no arrow keys, you can probably find alternate keys by
|
||
reading the source code.</p>
|
||
<h3 id="limits-portability">Limits, Portability:</h3>
|
||
<p>I tested the program on several Linux systems, on FreeBSD 12, and on
|
||
macOS (Mojave).</p>
|
||
<p>On Linux, the program uses an OS-specific detail to hide communication
|
||
artefacts, and avoids the need to remove them on exit.
|
||
Since this is Linux-specific, it was not possible on FreeBSD or macOS.
|
||
Its behavior is a little more <em>dirty</em> there.</p>
|
||
<p>The program should work on most terminals that support 8-bit colors,
|
||
inverse video mode, and movement escape codes, e.g. <code>xterm</code>, <code>gnome-terminal</code>,
|
||
<code>terminator</code>, etc.</p>
|
||
<p>Note: the drawing files <code>prog</code> generates are probably even more portable than
|
||
<code>prog</code> itself!</p>
|
||
<h3 id="drawing-area-size">Drawing area size:</h3>
|
||
<h4 id="the-drawing-area-size-is-set-at-compilation-time">The drawing area size is set at compilation time:</h4>
|
||
<p>The default size is the one of my xterm (see top of Makefile).
|
||
You may set it to the full size of your terminal window by typing:</p>
|
||
<pre><code> make clobber fullscreen</code></pre>
|
||
<p>IMPORTANT NOTES:</p>
|
||
<ul>
|
||
<li><strong>The program compiled with a given size will fail to reload a drawing file
|
||
with a different size!</strong></li>
|
||
<li>No scrolling is implemented (sorry but that would be too much for rule2!),
|
||
so any peer reaching the session should have a terminal with the same
|
||
size or larger.</li>
|
||
</ul>
|
||
<h3 id="prog.c-vs-prog.alt.c"><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/prog.c">prog.c</a> vs <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/prog.alt.c">prog.alt.c</a></h3>
|
||
<p>The file <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/prog.alt.c">prog.alt.c</a> is the one I submitted.</p>
|
||
<p>The judges proposed a small update: the program was using macro <code>FD_SET</code> inside an
|
||
expression, which breaks compilation on macOS. Wrapping this macro into a
|
||
function was enough to fix this compilation issue.</p>
|
||
<p>However, that was not enough to make the program work on macOS. If you analyse
|
||
the program you will see that it heavily relies on OS resources. And, for this
|
||
first version of the program, you even needed to increase default <code>sysctl</code>
|
||
parameters to make it work on FreeBSD (this was the purpose of the
|
||
<a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/check-os.sh">check-os.sh</a> file). I tried hard to tune macOS the same, but failed.</p>
|
||
<p>The simple fact the Judges proposed this update meant they wish it could work on
|
||
Mac. And if the judges wish something, it <strong>has to</strong> be done. ;) So I
|
||
refactored a little more the program to reduce OS resources consumption. Or
|
||
maybe not reduce consumption, but consume them differently… And I obtained
|
||
<a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/prog.c">prog.c</a>. With this version, no need to touch <code>sysctl</code> parameters, and
|
||
it works on macOS too! I must confess it was challenging to remain below the
|
||
size limit with this little change.</p>
|
||
<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="for-more-information">For more information</h3>
|
||
<p>See <a href="http://c-faq.com/ansi/constasconst.html" class="uri">http://c-faq.com/ansi/constasconst.html</a> for more information.</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: 2019/duble/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-2019duble">Inventory for 2019/duble</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/prog.c">prog.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/prog.alt.c">prog.alt.c</a> - alternate source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/prog.orig.c">prog.orig.c</a> - original source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/check-os.sh">check-os.sh</a> - script to check OS compatibility</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/fullscreen.sh">fullscreen.sh</a> - script to determine full screen size for make fullscreen</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="2019_duble.tar.bz2">2019_duble.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/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/2019/duble/.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/2019/duble/.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/2019/duble/.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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|
||
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/after-content.default.html -->
|
||
<!-- START: this line starts content from: inc/footer.inventory.html -->
|
||
|
||
<!--
|
||
|
||
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%2F2019%2Fduble%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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|
||
|
||
</body>
|
||
</html>
|
||
|
||
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|