Landon Curt Noll
9f57052020
We rewrote the `bin/tar-entry.sh` algorithm so that we do NOT have to require Linux to produce a compressed tarball that is byte-for-byte identical to a macOS compressed tarball for the same entry. Changed `bin/tar-entry.sh` VERSION from "1.2 2024-03-22" to "1.3 2024-03-25". Added `bin/untar-entry.sh` to untar an entry from the compressed tarball. Added `make untar_entry_tarball` to untar all entry files. Added `make untar_year_tarball` and `make untar_all_tarball` stub Makefile rules. The core it referred to does not yet exist. Updated IOCCC manifest. Updated `.entry.json` for `2004/sds`. Performed `make www` to update web pages. In most cases the entry `index.html` added an inventory link for the new `.tar.tstamp` file. Performed `form_entry_tarball` to complete the test of the above. TODO: Test the results under Linux. TODO: Update `bin/tar-year.sh`. Update year level compressed tarballs. TODO: Update `bin/tar-all.sh`. Update top level compressed tarball. TODO: Write `bin/untar-year.sh` and `bin/untar-all.sh`.
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<title>1992/albert - Most Useful Program</title>
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<meta name="description" content="1992 IOCCC entry albert - Most Useful Program">
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<meta name="keywords" content="IOCCC, 1992, IOCCC 1992, IOCCC entry, albert, Most Useful Program">
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<img src="../../png/ioccc.png" alt="IOCCC image by Matt Zucker" width=300 height=110>
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<h1>The International Obfuscated C Code Contest</h1>
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<h2>1992/albert - Most Useful Program</h2>
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<a class="Left" href="../adrian/index.html">← adrian</a>
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<a class="Left" href="../index.html">↑ 1992 ↑</a>
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<a class="Left" href="../ant/index.html">ant →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/1992/albert/albert.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/1992/albert/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
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<a href="../../bugs.html">Bugs & (mis)features</a>
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<a href="../../faq.html#fix_an_entry">Fixing IOCCC entries</a>
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<a href="../../faq.html#fix_web_site">Fixing the web site</a>
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<a href="../../faq.html#fix_author">Fixing author info</a>
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<hr>
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<div class="sidenav">
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<a href="../../judges.html">The IOCCC Judges</a>
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<a href="../../contact.html">Contacting the IOCCC</a>
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<h2 id="author"><a name="author"></a>Author:</h2>
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<ul>
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<li>Name: <a href="../../authors.html#Albert_van_der_Horst">Albert van der Horst</a><br>
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Location: <a href="../../location.html#NL">NL</a> - <em>Kingdom of the Netherlands</em> (<em>Netherlands</em>)
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<br><br></li>
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<h2 id="to-build">To build:</h2>
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<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span> all</span></code></pre></div>
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<p>An <a href="#alternate-code">alternate version</a> exists that fixes a bug.</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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<pre><code>STATUS: known bug - please help us fix</code></pre>
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<p>For more detailed information see <a href="../../bugs.html#1992_albert">1992 albert bugs</a>.</p>
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<h2 id="to-use">To use:</h2>
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<div class="sourceCode" id="cb3"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./albert</span> number</span></code></pre></div>
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<h2 id="try">Try:</h2>
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<div class="sourceCode" id="cb4"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.sh</span></span></code></pre></div>
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<h2 id="alternate-code">Alternate code:</h2>
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<p>An alternate version of this entry, <a href="albert.alt.c">albert.alt.c</a>, is provided.
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Leo Broukhis, before he was an IOCCC judge, sent the IOCCC
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judges this Email message:</p>
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<pre><code>From: leo _at_ zycad -dot- com (Leo Broukhis)
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Date: Tue, 30 Jan 96 17:37:51 PST
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To: judges _at_ toad -dot- com
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Subject: IOCCC 1992 - a bug
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Dear Judges,
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albert.c (even in its fixed form) still has a bug. Although I don't
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remember the number that exposed the bug (afair, resulting in coredump)
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in albert.orig.c that has been fixed in albert.c,
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I've found a number exposing another bug: 10000000001 (that's 9 0's).
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Both albert and albert.orig loop without printing anything, although
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the first factor is 101 and is usually found in an instant.</code></pre>
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<p>The <a href="albert.c">albert.alt.c</a> file is the fixed file, whereas the
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<a href="albert.c">albert.c</a> is the file before applying Leo Broukhis’ fix.</p>
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<h3 id="alternate-build">Alternate build:</h3>
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<p>To compile this alternate version:</p>
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<div class="sourceCode" id="cb6"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span> alt</span></code></pre></div>
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<h3 id="alternate-use">Alternate use:</h3>
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<p>Use <code>albert.alt</code> as you would <code>albert</code> above.</p>
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<h3 id="alternate-try">Alternate try:</h3>
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<div class="sourceCode" id="cb7"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.alt.sh</span></span></code></pre></div>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>We were impressed with the speed at which it was able to factor
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arbitrarily large numbers consisting of factors that fit into
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a long.</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<p>The Obfuscated version of the Horst algorithm.</p>
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<p>This program will factor unlimited length numbers and print the
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factors in ascending order. Numbers of one digit (e.g. 8)
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are rejected without notice.</p>
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<p>It quits as soon as there is at most one factor left, but that factor will not
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be shown. It accomplishes this efficiently, without resorting to division or
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multiplication, until the candidate factor no longer fits in a signed long.</p>
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<p>The nicest way is to rename the program into e.g. 4294967297
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if you want to factor Fermat’s 4th number. Then just run it.</p>
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<p>Or you may type <code>./albert <some-number></code>
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A nice one is also (30 ones):</p>
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<div class="sourceCode" id="cb8"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./albert</span> 111111111111111111111111111111</span></code></pre></div>
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<p>Apart from the foregoing there are no special execution instructions.</p>
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<p>To customize the program into a factorizer of a fixed number, use</p>
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<div class="sourceCode" id="cb9"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a><span class="fu">cc</span> albert.c <span class="at">-o</span> 4294967297</span></code></pre></div>
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<p>or some such.</p>
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<p>There are no data files used, and it is not possible to feed input
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via <code>stdin</code>.</p>
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<p>I think this program is a nice example of algorithmic obfuscation. Several
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times two similar algorithms are merged into one. Then you need quite some
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tricks to get it running, such as long jumps through recursive subroutines. I
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felt like a sword smith, welding the sword very long, folding it again to the
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proper length, keep on hammering till it is tight, then fold again. Always
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keeping it at the proper red hot temperature, but not too hot lest the hardness
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fades.</p>
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<p>The strict naming conventions for subroutines did not make things much clearer
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after all, but it was not supposed to.</p>
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<p>I would like to draw attention to the robustness of the program with respect to
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error handling and the nice stopping criterion. The aesthetic appeal of some
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lines is at the expense of clearness, I apologize.</p>
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<p>Running the program through the C-beautifier reveals nothing, it will only
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destroy some of the lay out. Running the program through lint shows the usual
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remarks for a K&R program. Defeating this through casts does not make a program
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cleaner in my opinion.</p>
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<h3 id="hints">Hints</h3>
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<p>Here are some hints, but they may not be too helpful:</p>
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<ol type="1">
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<li>The Horst algorithm is described in the Hobby Computer Club Newsletter, year
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82, part 4, a real Dutch treat. Assembly, C and Forth version have been around
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for some years.</li>
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<li>Does fractal programming exist after all?</li>
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<li>You remember the Toom-Cook algorithm in Knuth? It uses iteration instead of
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recursion and is quite jumpy. This program shares these disadvantages in a
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modified form.</li>
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<li>The Conversion is to be found in Knuth, not so the Observation. The
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Observation: “if it ends in a zero, it is divisible by ten”.</li>
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</ol>
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<!--
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
|
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You are free to share and adapt this file under the terms of this license:
|
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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For more information, see:
|
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https://creativecommons.org/licenses/by-sa/4.0/
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-->
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<h1 id="inventory-for-1992albert"><a name="inventory"></a>Inventory for 1992/albert</h1>
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<p><a href="#top">Jump to top</a></p>
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<h2 id="primary-files">Primary files</h2>
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<ul>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/albert/albert.c">albert.c</a> - entry source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/albert/Makefile">Makefile</a> - entry Makefile</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/albert/albert.alt.c">albert.alt.c</a> - alternative source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/albert/albert.orig.c">albert.orig.c</a> - original source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/albert/try.alt.sh">try.alt.sh</a> - how to run alternative code</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/albert/try.sh">try.sh</a> - how to run</li>
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<li><a href="1992_albert.tar.bz2">1992_albert.tar.bz2</a> - download entry source</li>
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</ul>
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<h2 id="secondary-files">Secondary files</h2>
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<ul>
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<li><a href="index.html">index.html</a> - entry home page</li>
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||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/albert/README.md">README.md</a> - markdown source for index.html</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/albert/.entry.json">.entry.json</a> - description of entry in JSON</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/albert/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
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<li><a href=".path">.path</a> - directory path from top directory</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/albert/.tar.tstamp">.tar.tstamp</a> - timestamp of compressed tarball formation</li>
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</ul>
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<!--
|
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|
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
|
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|
||
You are free to share and adapt this file under the terms of this license:
|
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|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
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|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
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|
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-->
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<div class="footer">
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||
<h2>Copyright and CC BY-SA 4.0 License</h2>
|
||
<p>This file and web page is:</p>
|
||
<blockquote><b>Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.</b></p></blockquote>
|
||
<p>You are free to share and adapt this file under the terms of this license:</p>
|
||
<blockquote><b>Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)</b></blockquote>
|
||
<p>For more information, see:</p>
|
||
<blockquote><a
|
||
href="https://creativecommons.org/licenses/by-sa/4.0/">https://creativecommons.org/licenses/by-sa/4.0/</a></blockquote>
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||
<h2>Coda</h2>
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<p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1992%2Falbert%2Findex.html">Nu HTML check this web page</a></p>
|
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<p><a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a></p>
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