The sections have been modified a fair amount. The Entries menu has been extended to have: Fixing entries, Updating author info, Thanks for the help. The first two were moved from FAQ and the last one from About. The rationale for these, in order: entries and authors have to do with entries and most of the help involves entries. It also has to do with website but in 'about' it does not seem the right place, unless maybe it is renamed to 'Credits' or something (I am not suggesting this one way or the other). This one is debatable but that was the rationale. The Status menu has been extended to have: Markdown guidelines and Security policy. The rationale is that the markdown guidelines are part of contest guidelines and the security policy is about the status of the entries and how if there are any security problems they will not be addressed (instead of about the IOCCC). The FAQ was extended to have: Compiling entries, Running entries, How to help. The reason to not have compiling and running entries under Entries is because this is 'how to' and also the menu was too long. How to help seems like a good idea under FAQ too (was in About). About was extended to have the new 'about.html' page (from about.md). This is a rare case where a new file is useful as it fits under 'About'. The menu now is: Home page, About the IOCCC, The Judges, Contact us. I was pondering the 'About [the IOCCC]' at the top and also naming it 'About us' but it seemed like a link to index.html was necessary and as for 'about us' it seemed less clear as to whether it was about the judges or the contest itself. The FAQ has been updated slightly for this. After further inspection the bin/index.html and the inc/index.html links were removed from the about section. With these changes, renaming an item or slight reordering notwithstanding, I believe that #2006 is probably in good shape.
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690 lines
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Contest status
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Rules and guidelines
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Markdown guidelines
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Compiling entries
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Running entries
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How to help
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About the IOCCC
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The Judges
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Contact us
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<div class="header">
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<a href="../../2011/zucker/index.html">
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<img src="../../png/ioccc.png"
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alt="IOCCC image by Matt Zucker"
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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>1992/imc - Best output</h2>
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<h3>Mandelbrot/Julia drawer</h3>
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</div>
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<!-- END: this line ends content from: inc/header.default.html -->
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<div class="navbar">
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<a class="Left" href="../gson/index.html">← 1992/gson</a>
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<a class="Left" href="../index.html">↑ 1992 ↑</a>
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<a class="Left" href="../kivinen/index.html">1992/kivinen →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/imc/imc.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/imc/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%2F1992%2Fimc%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#Ian_Collier">Ian Collier</a><br>
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Location: <a href="../../location.html#GB">GB</a> - <em>United Kingdom of Great Britain and Northern Ireland</em> (<em>United Kingdom</em>)</li>
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<h2 id="to-build">To build:</h2>
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<pre><code> make all</code></pre>
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<h2 id="to-use">To use:</h2>
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<pre><code> # text mode
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./imc -text
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./imc</code></pre>
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<h2 id="try">Try:</h2>
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<p>To see a number of options and configurations:</p>
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<pre><code> ./try.sh</code></pre>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>The program is more interesting to run on workstations that can make use of a
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Sun raster file. Others can make use of the <code>-text</code> flag for character oriented
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output.</p>
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<p>Of course, the source (layout) is self-documenting! :-)</p>
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<p><strong>NOTE</strong>: The original winning source assumed that <code>exit(3)</code> returned a value which
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cause problems for some systems where <code>exit(3)</code> returns a void. The file
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<a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/imc/imc.c">imc.c</a> has been modified to avoid this problem. The original file also
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declared argc to be a <code>long</code> which was fixed.</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<h3 id="portability">Portability</h3>
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<p>This program depends upon the ASCII character set, and makes certain assumptions
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about the architecture. It naughtily declares the first argument to <code>main()</code> as
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a <code>long</code>, and passes a pointer to <code>long</code> instead of <code>char</code> to <code>fwrite(3)</code>,
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giving a length value of 32 bytes for an array of 8 <code>long</code>s. I guess that makes
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this program OK on most flavours of unix, but not on PCs.</p>
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<h3 id="about-the-program">About the program</h3>
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<p>This program has several parameters; each of them has a default, so the
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program runs happily without any parameters. If you supply an incorrect
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parameter, an obfuscated error message results! :-) Should you want to
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run the program without knowing what it does, then supplying the single
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letter <code>t</code> as a parameter is a good move. Otherwise, direct the output
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into a file. The resulting file is most useful on SunOS, where the
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<code>file(1)</code> command will tell you what to do with it. For best results with
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the <code>t</code> option, you may want to change the definition of the <code>I</code> macro :-)
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Details appear later, though the formatting of the code is a large clue.</p>
|
||
<p>All the code in this program appears between the <code>;</code> and <code>)</code> in
|
||
<code>for(;;)</code>. That isn’t because I want to win the best one-liner, but
|
||
merely because it makes the code so much more impenetrable :-) In fact
|
||
running a pretty printer on the code hardly improves it at all. This
|
||
program has the obligatory macros with unmatched parentheses, and the
|
||
cleverly arranged macro names and parameters to spell out <code>"Ian Colliers Obfuscated C Code"</code>. If you expand macros, bear in mind that the more
|
||
complex ones are best left as macros, because they have well-defined and
|
||
nontrivial (IMHO) functions. These macros help to give the program’s
|
||
parameter format its flexibility. The parameters are sorted out in a
|
||
unique way (based on an idea by Pete Bevin) which hides very effectively
|
||
their identities (and I think that using a variable called <code>_</code> adds a nice
|
||
touch to the illegibility of the code). In this section of the code, the
|
||
data types of the numbers checked against is varied, and just because
|
||
you see a <code>,</code> doesn’t mean it has anything to do with commas! So I hope
|
||
you will agree that this program is more than a little obfuscated…</p>
|
||
<p>This is a Mandelbrot/Julia drawer. Normally it produces a monochrome
|
||
Sun-format raster file. The version of <code>xloadimage</code> we have is able to
|
||
view such files, and so is Sun’s <code>screenload</code> command. [Note: the header
|
||
contains eight 4-byte integers, the byte order in which depends upon the
|
||
machine. On Sun workstations they are stored MSB first].</p>
|
||
<p>The program may be asked to produce text output instead of a raster
|
||
file. Then the characters defined in the <code>I</code> macro will be used to create
|
||
up to 16 different shades of grey. Quite a respectable picture can be
|
||
gained by printing a <code>130x110</code> output on a <a href="https://en.wikipedia.org/wiki/Dot_matrix_printing">dot matrix 132 column
|
||
printer</a> with the linefeed
|
||
set to 7 points. Text output also gives a good picture when used in an X window
|
||
with small characters having a square aspect ratio.</p>
|
||
<p>The options accepted by the program follow. Each option is a single letter; it
|
||
may be preceded with a minus sign (or any character in <code>[!-/]</code>) and may be
|
||
followed by other letters, so for example:</p>
|
||
<ul>
|
||
<li><code>m</code></li>
|
||
<li><code>-m</code></li>
|
||
<li><code>mask</code></li>
|
||
<li><code>*mail</code></li>
|
||
</ul>
|
||
<p>all mean the same thing. Most options may be followed by one or two
|
||
numbers. These numbers may be separated from each other and from the
|
||
option by a space, or may be joined to each other with a comma, or may
|
||
be appended to the single-letter option, so</p>
|
||
<ul>
|
||
<li><code>-s100,200</code></li>
|
||
<li><code>size 100,200</code></li>
|
||
<li><code>-size123 100 200</code></li>
|
||
<li><code>s100 200</code></li>
|
||
</ul>
|
||
<p>all mean the same (note that in <code>-size123</code> all characters following the
|
||
initial <code>s</code> are ignored). Numbers need not be specified, as each has a
|
||
default value. In all cases except for <code>j</code>, <code>t</code>, and <code>s</code> whenever it
|
||
appears before <code>t</code>, specifying an option without numbers has no effect.
|
||
(specifying <code>-s -t</code> has the effect of producing text with the default
|
||
raster size; not a good idea!).</p>
|
||
<h3 id="options">Options</h3>
|
||
<p>The options of this program are:</p>
|
||
<pre><code> -centre x y (float x,y) Centre the picture at x+iy in the complex
|
||
plane (default x=0 y=0)
|
||
|
||
|
||
-factor f (float f) Use f pixels per unit of the plane (default
|
||
f=x/4 where x is the width)
|
||
|
||
|
||
-julia x y (float x,y) Draw a julia set. Use x+iy as the constant
|
||
to add after squaring (default x=0 y=0)
|
||
|
||
-limit l (int l) Use l iterations maximum (default l=128)
|
||
|
||
-mask m (int m) Use m as a mask in deciding the colour of each
|
||
pixel (see below) (default m=1)
|
||
|
||
-size x y (int x,y) Produce an x-by-y output (default for raster
|
||
x=768 y=768; default for text x=63 y=23)
|
||
|
||
-text Produce text instead of raster.</code></pre>
|
||
<p>The colour of each point is determined by taking the bitwise AND of the
|
||
number of iterations and the mask. For a raster, the point is black
|
||
(1-bit) if the result is zero, white otherwise. For text, the result of
|
||
the operation determines the greyness of the character produced, with a
|
||
blank for zero going up to a star for the maximum value. For a
|
||
four-colour picture, for example, use a mask with two bits set (e.g. 3),
|
||
and for a 16-colour picture use a mask with four bits set (e.g. 15). For
|
||
a picture with coarse detail, use a mask which ends with several zero
|
||
bits (e.g. 8).</p>
|
||
<p>While the program is creating your picture, it displays dots on the
|
||
standard error to indicate its progress (one dot per pixel line).</p>
|
||
<h3 id="example-pictures-to-try">Example pictures to try</h3>
|
||
<p>Here are a couple of good pictures to draw:</p>
|
||
<pre><code> ./imc -s 512,512 -f 600000 -l 512 -m 16 -c.00805,.74274 > screen1.ras
|
||
./imc -s512,512 -j-.523,-.535 > screen2.ras</code></pre>
|
||
<!--
|
||
|
||
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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|
||
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|
||
|
||
<!-- START: this line starts content generated by: bin/output-index-inventory.sh -->
|
||
|
||
<div id="inventory">
|
||
<h1 id="inventory-for-1992imc">Inventory for 1992/imc</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/imc/imc.c">imc.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/imc/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/imc/imc.orig.c">imc.orig.c</a> - original source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/imc/try.sh">try.sh</a> - script to try entry</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="1992_imc.tar.bz2">1992_imc.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/imc/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/1992/imc/.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/1992/imc/.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/1992/imc/.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%2F1992%2Fimc%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>
|
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||
</div>
|
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</body>
|
||
</html>
|
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|
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