Files
Landon Curt Noll a1c86c8a7a add original C links to entry navigation bars
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.
2025-08-10 12:46:23 -07:00

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<h1>The International Obfuscated C Code Contest</h1>
<h2>1998/dorssel - Obsolescent feature</h2>
<h3>ASCII / Morse code translator</h3>
</div>
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<div class="navbar">
<a class="Left" href="../dloweneil/index.html">&larr; 1998/dloweneil</a>
<a class="Left" href="../index.html">&uarr; 1998 &uarr;</a>
<a class="Left" href="../fanf/index.html">1998/fanf &rarr;</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1998/dorssel/dorssel.c">C code</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1998/dorssel/Makefile">Makefile</a>
<a class="Right" href="#inventory">Inventory</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Frans_van_Dorsselaer">Frans van Dorsselaer</a><br>
Location: <a href="../../location.html#NL">NL</a> - <em>Kingdom of the Netherlands</em> (<em>Netherlands</em>)</li>
</ul>
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<h2 id="to-build">To build:</h2>
<pre><code> make all</code></pre>
<h2 id="to-use">To use:</h2>
<pre><code> ./dorssel
# input some text
echo text | ./dorssel</code></pre>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh</code></pre>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>How does the program decide which way to convert?</p>
<p>What obsolescent feature are we talking about? (No, it’s not a
C language feature.)</p>
<p>The author suggests that you try to answer the following questions:</p>
<ul>
<li><p>Which character in the initializing string is totally irrelevant?</p></li>
<li><p>Which two relevant characters in the initializing string may be exchanged
without altering the behavior?</p></li>
<li><p>Which characters in the initializing string are somewhat irrelevant, and to
what values may they be changed without altering the behavior?</p></li>
<li><p>Which characters may be used to enlarge the initializing string by one without
altering the behavior ?</p></li>
</ul>
<h3 id="extra-credit">Extra credit:</h3>
<p>Try doing what the last part of the last command in <a href="https://github.com/ioccc-src/winner/blob/master/1998/dorssel/try.sh">try.sh</a> suggests.
As in, do the following:</p>
<pre><code> echo &quot;. -..- . .-. -.-. .. ... .
-.-. .... .- -. --. . - .... . .--. .-. --- --. .-. .- -- ... --- .. - -.. --- . ... -. --- - ... .... --- ..- -&quot; | ./dorssel</code></pre>
<p>and make the necessary adjustments.</p>
<p>You might also want to read the <a href="dorssel.html">dorssel.html</a> file.</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<h3 id="usage">Usage</h3>
<p>This program converts ASCII to <a href="https://en.wikipedia.org/wiki/Morse_code">Morse
code</a>, and vice versa.</p>
<p>The program reads in lines from standard input and writes its result to
standard output. The direction of conversion is determined on a per
line basis. Each line must consist of a maximum of 952 characters
followed by a new line character and they must not contain any NUL
characters. Otherwise, some characters may be lost in the conversion.</p>
<ul>
<li><p>Encoding to Morse code: The program knows the Morse codes for all Latin
letters (a-z, case insensitive) and decimal digits (0-9). Any other characters
are replaced by an ASCII space, <code>' '</code>. Morse code per converted character is
written as a sequence of <code>.</code> and <code>-</code> characters, each sequence followed by a
space.</p></li>
<li><p>Decoding from Morse code: Morse code should be typed as sequences of <code>.</code> and
<code>-</code> characters, separated by a space. Extra spaces will be echoed back (to
separate words). Unknown sequences will be converted to a <code>?</code> character.</p></li>
</ul>
<h3 id="notes">Notes</h3>
<p>The program assumes both source and execution character sets to be
ASCII. As far as I can tell, the program is conforming and does not
invoke undefined behavior.</p>
<h3 id="hints">Hints</h3>
<p>Try:</p>
<pre><code> ./dorssel &lt; dorssel.c | ./dorssel</code></pre>
<p>to see what variables, numbers, and functions are used. (Does a
better job than most C beautifiers).</p>
<ul>
<li>Filter your text twice (as in the previous sample) to obtain a version of your
text that can be reversibly Morsified, i.e.</li>
</ul>
<pre><code> ./dorssel &lt; dorssel.c | ./dorssel | ./dorssel | ./dorssel</code></pre>
<p>is the same as</p>
<pre><code> ./dorssel &lt; dorssel.c | ./dorssel</code></pre>
<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 without running the command below.
If you get stuck, come back and read the below.</p>
<p>The file <a href="dorssel.html">dorssel.html</a> contains all the information needed to
understand this program.</p>
<p>For more information you might also try:</p>
<pre><code> ./dorssel &lt; dorssel.md</code></pre>
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<div id="inventory">
<h1 id="inventory-for-1998dorssel">Inventory for 1998/dorssel</h1>
</div>
<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1998/dorssel/dorssel.c">dorssel.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1998/dorssel/Makefile">Makefile</a> - entry Makefile</li>
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<li><a href="https://github.com/ioccc-src/winner/blob/master/1998/dorssel/try.sh">try.sh</a> - script to try entry</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="1998_dorssel.tar.bz2">1998_dorssel.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1998/dorssel/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1998/dorssel/dorssel.md">dorssel.md</a> - markdown source for dorssel.html</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1998/dorssel/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1998/dorssel/.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/1998/dorssel/.path">.path</a> - directory path from top level directory</li>
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