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<h1>The International Obfuscated C Code Contest</h1>
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<h2>1993/lmfjyh - Most versatile source</h2>
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<h3>source is the filename that prints value of __FILE__</h3>
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<a class="Left" href="../leo/index.html">← 1993/leo</a>
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<a class="Left" href="../plummer/index.html">1993/plummer →</a>
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1993/lmfjyh/lmfjyh.c">C code</a>
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F1993%2Flmfjyh%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#Jyrki_Holopainen">Jyrki Holopainen</a><br>
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Location: <a href="../../location.html#FI">FI</a> - <em>Republic of Finland </em> (<em>Finland</em>)</li>
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<!-- BEFORE: 1st line of markdown file: 1993/lmfjyh/README.md -->
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<h2 id="to-build">To build:</h2>
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<p>If you have gcc < 2.3.3 you can build this entry like:</p>
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<pre><code> make all</code></pre>
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||
<p>This will try to create a file whose actual filename is literally:</p>
|
||
<pre><code> ";main(){puts("Hello World!");}char*C=".c</code></pre>
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<p>When that file is compiled, it will greet the world in the
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traditional fashion of C.</p>
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<p>For an explanation of why and how this works see the author’s remarks. The gist
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of the entry itself, however, is the file name <em>itself</em> <strong>is</strong> <em>part of the code</em>.</p>
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<p><strong>NOTE</strong>: We delete the temporary file as part of <code>make all</code> whether
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or not the compilation succeeds. This is a Makefile <strong>feature</strong>
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that might <strong>bug</strong> anyone running the make command. :-)</p>
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<p>This entry will not compile with gcc version >= 2.3.3 as it relied
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on a bug which was later fixed in gcc 2.3.3, and that happened
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<em>a long time ago</em> (.. <em>in a galaxy far, far away</em>?).</p>
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<p>If <code>make all</code> fails to compile, a suggestion of compiling and running
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the alternate version is printed. This alternate version is a variant
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for those of us with gcc >= 2.3.3 or using clang. See <a href="#alternate-code">Alternate
|
||
code</a> section below for more details.</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>
|
||
<p>For more detailed information see <a href="../../bugs.html#1993_lmfjyh">1993/lmfjyh in bugs.html</a>.</p>
|
||
<h2 id="to-use">To use:</h2>
|
||
<p>If you have gcc < 2.3.3 (i.e. the entry can compile):</p>
|
||
<pre><code> ./lmfjyh</code></pre>
|
||
<h2 id="alternate-code">Alternate code:</h2>
|
||
<p>This version does what the code did but in a way that will work with modern
|
||
compilers. We’d like to say there’s something special about it but there isn’t.</p>
|
||
<h3 id="alternate-build">Alternate build:</h3>
|
||
<p>Should you wish to build this version manually:</p>
|
||
<pre><code> make alt</code></pre>
|
||
<h3 id="alternate-use">Alternate use:</h3>
|
||
<p>Use <code>lmfjyh.alt</code> as you would <code>lmfjyh</code> above. Note that other code could also be
|
||
done with the bug that the entry abuses but that would have to be manually
|
||
programmed for this version; see the author’s remarks for more details.</p>
|
||
<h2 id="judges-remarks">Judges’ remarks:</h2>
|
||
<p>There’s more than one way to get around disk quotas. :-)</p>
|
||
<h2 id="authors-remarks">Author’s remarks:</h2>
|
||
<p>“Practical and efficient method of compressing source code”.</p>
|
||
<h3 id="introduction">Introduction</h3>
|
||
<p>I will shortly present a totally new compression method.
|
||
It may be used to compress any types of files, but it works
|
||
best with C-source code.</p>
|
||
<p>As an example, I have taken a simple “Hello world!” program
|
||
that should be familiar to all C-programmers.</p>
|
||
<h4 id="listing-1-a-simple-hello-world-program">Listing 1: A simple “Hello World” program</h4>
|
||
<pre><code> main()
|
||
{
|
||
puts("Hello World!");
|
||
}</code></pre>
|
||
<h3 id="packing-method">Packing method</h3>
|
||
<p>Normally a file name is used only to identify the file, but this new
|
||
revolutionary method introduces a totally new concept: <strong>THE FILE NAME <em>IS</em> THE
|
||
PROGRAM</strong>. There is no need to waste valuable disk space to store source code.
|
||
The program is embedded in the file name, only a minor portion of it is inside
|
||
the file.</p>
|
||
<h4 id="listing-2-compressed-hello-world">Listing 2: Compressed “Hello world”</h4>
|
||
<pre><code> char*_=__FILE__;</code></pre>
|
||
<h4 id="listing-3-code-embedded-in-the-file-name">Listing 3: Code embedded in the file name</h4>
|
||
<pre><code> ";main(){puts("Hello World!");}char*C=".c</code></pre>
|
||
<p>The sample program in listing 1 is 36 bytes long. By using the new
|
||
compression method, the example program may be squeezed to sixteen
|
||
bytes. In the example the compression ratio is 2:1. It is evident
|
||
that the longer the program is, the better the compression ratio
|
||
is. The maximum compression ratio in a UNIX environment is 254:16
|
||
which equals approximately to 16:1. By using the method a one
|
||
megabyte of source code file can be compressed to 64 kilobytes.</p>
|
||
<p>One might easily think that the program could be compressed to a
|
||
single byte by writing a one character long preprocessor directive
|
||
in the source file and defining the actual source code in the
|
||
command line, e.g. <code>cc hello.c -DX='main(){puts ...'</code>. With this
|
||
method nothing is gained, since the compiling commands must be
|
||
stored in a file, and that takes even more space than writing the
|
||
code in a source file as presented in listing 1.</p>
|
||
<h3 id="packing-files-in-a-unix-environment">Packing files in a UNIX environment</h3>
|
||
<p>In a UNIX environment it is possible to write almost any program by
|
||
including the code in file names. Since <code>/</code> is used to separate
|
||
path components and cannot therefore exist in a file name, all
|
||
features of the C language cannot be used.</p>
|
||
<p>In C, the <code>/</code> is used as a division operator and it may also be a
|
||
part of a comment start and end identifier. This, however, is not a
|
||
dangerous limitation, since practice has shown that comments are
|
||
almost totally unnecessary. A real programmer can more easily
|
||
understand pure source code, and misleading comments are
|
||
disastrous. The division operation may be replaced with <code>pow(x, -1)</code>
|
||
and multiplication when using real numbers or with <code>div()</code> function
|
||
when using integers.</p>
|
||
<p>Large programs must be separated into small modules. This enforces
|
||
people to write better programs, since monolithic programming style
|
||
cannot be used. Program development will also be faster, no extra
|
||
code needs be recompiled after changes have been made.</p>
|
||
<h3 id="usage-with-currently-available-tools">Usage with currently available tools</h3>
|
||
<p>I have tested how well this new method works with currently
|
||
available programming tools.</p>
|
||
<p>Any ANSI conforming C-compiler that runs under a REAL operating
|
||
system should be able to compile the code (there might be problems
|
||
with some older UNIX variants).</p>
|
||
<h3 id="compilers">Compilers</h3>
|
||
<p>These worked:</p>
|
||
<ul>
|
||
<li>gcc versions 2.0, 2.1, 2.3.2 (ld failed at AIX with gcc 2.1)</li>
|
||
<li>cc (HP-UX)</li>
|
||
<li>cc (VAX)</li>
|
||
</ul>
|
||
<p>These failed miserably:</p>
|
||
<ul>
|
||
<li>cc (SunOS/Solaris) - could not start cpp properly</li>
|
||
<li>cc/xlc (AIX) - could not open source</li>
|
||
</ul>
|
||
<h3 id="other-tools">Other tools</h3>
|
||
<h4 id="debuggers-tested-at-sunos-4.1.2">Debuggers: (tested at SunOS 4.1.2)</h4>
|
||
<ul>
|
||
<li><p><code>dbx</code> - Quit with a very ‘informative’ error message:
|
||
<code>"dbx: fatal error: Is a directory"</code></p></li>
|
||
<li><p><code>gdb</code> - Printed almost the same error message <code>": Is a directory"</code>.
|
||
It was, however, possible to step through the code but
|
||
not list it.</p></li>
|
||
</ul>
|
||
<h4 id="lints">Lints</h4>
|
||
<p>None of the lints tested environments were able to parse the file.</p>
|
||
<h3 id="conclusions">Conclusions</h3>
|
||
<p>The method can be used to compress any type of file and the compression ratios
|
||
are even better when compressing files other than C source. For example plain
|
||
text files may be compressed with INFINITE compression ratio. It is trivial task
|
||
to compress a 100 kilobytes long text file in about 400 files whose lengths are
|
||
zero bytes. The drawback is that the files must be unpacked before they can be
|
||
used, so a large amount of temporary disk space is needed, while C source is
|
||
totally usable in the compressed form.</p>
|
||
<p>Evidently, there is a long way to go before this new programming
|
||
technique may be widely used, since currently there are only few
|
||
tools supporting it. The advantages over the traditional methods
|
||
are, however, so great that there is no doubt that this method will
|
||
be new standard.</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: 1993/lmfjyh/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-1993lmfjyh">Inventory for 1993/lmfjyh</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/lmfjyh/lmfjyh.c">lmfjyh.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/lmfjyh/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/lmfjyh/lmfjyh.alt.c">lmfjyh.alt.c</a> - alternate source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/lmfjyh/lmfjyh.orig.c">lmfjyh.orig.c</a> - original source code</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="1993_lmfjyh.tar.bz2">1993_lmfjyh.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/lmfjyh/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/lmfjyh/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/lmfjyh/.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/1993/lmfjyh/.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%2F1993%2Flmfjyh%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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|