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>1996/westley - Best one liner</h2>
<h3>Shows the time on clock with a configurable face and style</h3>
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<div class="navbar">
<a class="Left" href="../schweikh3/index.html">&larr; 1996/schweikh3</a>
<a class="Left" href="../index.html">&uarr; 1996 &uarr;</a>
<a class="Left" href="../../1998/banks/index.html">1998/banks &rarr;</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1996/westley/westley.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Brian_Westley">Brian Westley</a><br>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
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<h2 id="to-build">To build:</h2>
<pre><code> make all</code></pre>
<p>There is another version which is the original entry. See <a href="#alternate-code">Alternate
code</a> for details as to how to use and why it was made the
alt version.</p>
<h2 id="to-use">To use:</h2>
<pre><code> ./clock1.sh
./clock2.sh
./clock3.sh</code></pre>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh</code></pre>
<h2 id="alternate-code">Alternate code:</h2>
<p>The original version had a display problem in modern systems which somewhat
affected the usability of the program. This alternate code, the original, is
provided, to show the differences.</p>
<h3 id="alternate-build">Alternate build:</h3>
<pre><code> make alt</code></pre>
<h3 id="alternate-try">Alternate try:</h3>
<pre><code> ./try.alt.sh</code></pre>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>Time and time again, Brian Westley seems to come up with a winning entry!
We are amazed at how much is being done with only one relatively
short line. We think you will as well if you take the time to
understand it.</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p>This 1-line program allows various analog ASCII clocks to print out the time;
the ASCII clock is built from the command line arguments, so many different
types of clocks can be generated. Three different scripts are supplied to print
out a grandfather clock, a mantle clock that runs backwards, and a linear-style
clock. (they are <a href="https://github.com/ioccc-src/winner/blob/master/1996/westley/clock1.sh">clock1.sh</a>,
<a href="https://github.com/ioccc-src/winner/blob/master/1996/westley/clock2.sh">clock2.sh</a>, and
<a href="https://github.com/ioccc-src/winner/blob/master/1996/westley/clock3.sh">clock3.sh</a>.</p>
<p>The program makes the following (possibly non-portable) assumptions:</p>
<ol type="1">
<li><p>Command line strings can be written to.</p></li>
<li><p><code>argv[0]</code> can be written to as if it were a <code>long *</code>.</p></li>
<li><p>The first three elements of the <code>struct *</code> returned by <code>localtime(3)</code> are
seconds, minutes, hours, and all are <code>int</code>s.</p></li>
<li><p>My sample scripts assume ASCII, though this is not inherent in the code, just
my sample scripts.</p></li>
</ol>
<p>These assumptions are pretty reasonable. 2) can be eliminated but makes the code
larger.</p>
<p>The code is simple; the arguments passed are:</p>
<pre><code> ./westley minute_map hour_map hand_symbol clock_image</code></pre>
<p>The program merely takes the minute (0-59) and the hour (0-23)
values, looks up the offsets in <code>minute_map</code> and <code>hour_map</code>
and writes the <code>hand_symbol</code> for each into the <code>clock_image</code>
string. This string is then printed.</p>
<p>The <code>for()</code> loop starts by calling <code>time()</code> with <code>argv[0]</code>, so
the time value (a <code>long</code>) is written into the program name.
The <code>for()</code> control value is <code>argc</code>, which starts at <code>5</code>, but
the <code>/=2</code> statement is executed before the test, so the <code>for()</code>
loop is executed twice, with <code>h=2</code>, then <code>h=1</code> (for hour &amp; minute).</p>
<p>The statement of the <code>for()</code> loop takes the hour or minute
field of the struct returned by <code>localtime(3)</code> by casting it
to an <code>int *</code> and dereferencing element <code>[h]</code>. It is slightly
smaller to use the trick <code>h[(int*)localtime(*m)]</code> instead of
<code>((int*)localtime(*m))[h]</code>.</p>
<p>This value is in turn indexed into the <code>hour_map</code> or <code>minute_map</code>
parameter to determine where the ‘hand’ symbol should be
written into the <code>clock_image</code>.</p>
<p>Note that the hands move in a quantum fashion; 3:59 looks
deceptively like 2:59, since the hour hand will be at the 3
position. It won’t move until both hands click over at 4:00.</p>
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<div id="inventory">
<h1 id="inventory-for-1996westley">Inventory for 1996/westley</h1>
</div>
<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/westley/westley.c">westley.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/westley/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/westley/westley.alt.c">westley.alt.c</a> - alternate source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/westley/westley.orig.c">westley.orig.c</a> - original source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/westley/clock1.sh">clock1.sh</a> - script to try first clock</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/westley/clock2.sh">clock2.sh</a> - script to try second clock</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/westley/clock3.sh">clock3.sh</a> - script to try third clock</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/westley/try.alt.sh">try.alt.sh</a> - script to try alternate code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/westley/try.sh">try.sh</a> - script to try entry</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="1996_westley.tar.bz2">1996_westley.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/westley/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/westley/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/westley/.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/1996/westley/.path">.path</a> - directory path from top level directory</li>
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