The navigation bar for a winning entry now has a "_Original C_" link
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width=300
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</a>
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<h1>The International Obfuscated C Code Contest</h1>
|
||
<h2>1992/imc - Best output</h2>
|
||
<h3>Mandelbrot/Julia drawer</h3>
|
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</div>
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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/winner/blob/master/1992/imc/imc.c">C code</a>
|
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|
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|
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1992/imc/imc.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%2F1992%2Fimc%2Findex.html">✓</a>
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<h2 id="author">Author:</h2>
|
||
<ul>
|
||
<li>Name: <a href="../../authors.html#Ian_Collier">Ian Collier</a><br>
|
||
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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<!-- BEFORE: 1st line of markdown file: 1992/imc/README.md -->
|
||
<h2 id="to-build">To build:</h2>
|
||
<pre><code> make all</code></pre>
|
||
<h2 id="to-use">To use:</h2>
|
||
<pre><code> # text mode
|
||
./imc -text
|
||
|
||
./imc</code></pre>
|
||
<h2 id="try">Try:</h2>
|
||
<p>To see a number of options and configurations:</p>
|
||
<pre><code> ./try.sh</code></pre>
|
||
<h2 id="judges-remarks">Judges’ remarks:</h2>
|
||
<p>The program is more interesting to run on workstations that can make use of a
|
||
Sun raster file. Others can make use of the <code>-text</code> flag for character oriented
|
||
output.</p>
|
||
<p>Of course, the source (layout) is self-documenting! :-)</p>
|
||
<p><strong>NOTE</strong>: The original winning source assumed that <code>exit(3)</code> returned a value which
|
||
cause problems for some systems where <code>exit(3)</code> returns a void. The file
|
||
<a href="https://github.com/ioccc-src/winner/blob/master/1992/imc/imc.c">imc.c</a> has been modified to avoid this problem. The original file also
|
||
declared argc to be a <code>long</code> which was fixed.</p>
|
||
<h2 id="authors-remarks">Author’s remarks:</h2>
|
||
<h3 id="portability">Portability</h3>
|
||
<p>This program depends upon the ASCII character set, and makes certain assumptions
|
||
about the architecture. It naughtily declares the first argument to <code>main()</code> as
|
||
a <code>long</code>, and passes a pointer to <code>long</code> instead of <code>char</code> to <code>fwrite(3)</code>,
|
||
giving a length value of 32 bytes for an array of 8 <code>long</code>s. I guess that makes
|
||
this program OK on most flavours of unix, but not on PCs.</p>
|
||
<h3 id="about-the-program">About the program</h3>
|
||
<p>This program has several parameters; each of them has a default, so the
|
||
program runs happily without any parameters. If you supply an incorrect
|
||
parameter, an obfuscated error message results! :-) Should you want to
|
||
run the program without knowing what it does, then supplying the single
|
||
letter <code>t</code> as a parameter is a good move. Otherwise, direct the output
|
||
into a file. The resulting file is most useful on SunOS, where the
|
||
<code>file(1)</code> command will tell you what to do with it. For best results with
|
||
the <code>t</code> option, you may want to change the definition of the <code>I</code> macro :-)
|
||
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/
|
||
|
||
-->
|
||
<!-- AFTER: last line of markdown file: 1992/imc/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-1992imc">Inventory for 1992/imc</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/imc/imc.c">imc.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/imc/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/imc/imc.orig.c">imc.orig.c</a> - original source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/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/winner/blob/master/1992/imc/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/imc/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/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/winner/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>
|
||
|
||
<!-- END: next line ends content generated by: bin/output-index-inventory.sh -->
|
||
|
||
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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%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>
|
||
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/footer.inventory.html -->
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||
|
||
</body>
|
||
</html>
|
||
|
||
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|