Renamed `ioccc.ico` to `favicon.ico`. Correctly added use of `favicon.ico` to all constructed HTML headers. Fixed the smart quote in HTML elements problem. Moved HTML "DO NOT EDIT" comments down below at the bottom of the HTML phase 1 section. According to to the Nu Html Checker, a charset attribute on a meta element found after the first 1024 bytes. Changed `bin/md2html.sh` VERSION from "1.1.3 2024-03-28" to "1.2 2024-03-30". Improved `bin/gen-status.sh` to adjust the "status_update" value only when the "contest_status" is changed. Performed a `make www` to perform and test the above under macOS.
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397 lines
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<title>1990/jaw - Best Entropy-reducer</title>
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<meta name="description" content="1990 IOCCC entry jaw - Best Entropy-reducer">
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<div class="header">
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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>1990/jaw - Best Entropy-reducer</h2>
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<a class="Left" href="../dg/index.html">← dg</a>
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<a class="Left" href="../index.html">↑ 1990 ↑</a>
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<a class="Left" href="../pjr/index.html">pjr →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/1990/jaw/jaw.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/1990/jaw/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="../../judges.html">The IOCCC Judges</a>
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<h2 id="authors"><a name="author"></a>Authors:</h2>
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<ul>
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<li>Name: <a href="../../authors.html#James_A_Woods">James A. Woods</a><br>
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Location: <a href="../../location.html#ZZ">ZZ</a> - <em>Unknown location</em>
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<br><br></li>
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<li>Name: <a href="../../authors.html#Karl_F_Fox">Karl F. Fox</a><br>
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Location: <a href="../../location.html#ZZ">ZZ</a> - <em>Unknown location</em>
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<br><br></li>
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<li>Name: <a href="../../authors.html#Paul_Eggert">Paul Eggert</a><br>
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Location: <a href="../../location.html#ZZ">ZZ</a> - <em>Unknown location</em>
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<br><br></li>
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</ul>
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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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<h2 id="try">Try:</h2>
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<p>To test the official C entry, one might try:</p>
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<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="bu">echo</span> <span class="st">"Quartz glyph jocks vend, fix, BMW."</span> <span class="kw">|</span> <span class="ex">compress</span> <span class="kw">|</span> <span class="ex">./btoa</span> <span class="kw">|</span> <span class="ex">./jaw</span></span></code></pre></div>
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<p>which should apply the identity transformation to a minimal holoalphabetic
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sentence.</p>
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<h4 id="also-try">Also try:</h4>
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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">./try.sh</span></span></code></pre></div>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>The program, in its base form, implements two useful utilities:</p>
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<ul>
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<li><code>atob</code> - ASCII to binary conversion</li>
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<li><code>zcat</code> - decompression filter</li>
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</ul>
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<p>Included with this entry is a shell script (with comments edited down to reduce
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it to 1530 bytes) which implements the complete shark utility. The script,
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<a href="shark.sh">shark.sh</a>, contains a <code>jaw.c</code> embedded within it!</p>
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<p>The sender must have <code>compress</code> and <code>btoa</code>. To send, try:</p>
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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">./shark.sh</span> jaw.<span class="pp">*</span> README.md <span class="op">></span> receive</span></code></pre></div>
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<p>The resulting file, <code>receive</code>, unpacks the input files
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even if the receiver lacks <code>uncompress</code> and <code>btoa</code>:</p>
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<div class="sourceCode" id="cb5"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="fu">mkdir</span> <span class="at">-p</span> test</span>
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<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a><span class="bu">cd</span> test</span>
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<span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a><span class="fu">sh</span> ../receive</span>
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<span id="cb5-4"><a href="#cb5-4" aria-hidden="true" tabindex="-1"></a><span class="fu">cmp</span> ../jaw.c jaw.c</span>
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<span id="cb5-5"><a href="#cb5-5" aria-hidden="true" tabindex="-1"></a><span class="fu">cmp</span> ../README.md README.md</span></code></pre></div>
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<p>NOTE: a limitation is that the script should be in the parent directory of the
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directory it is run from.</p>
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<h2 id="authors-remarks">Authors’ remarks:</h2>
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<h3 id="abstract">ABSTRACT</h3>
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<h4 id="minimal-universal-file-bundling-or-functional-obfuscation-in-a-self-decoding-unix-shell-archive">Minimal, Universal File Bundling (or, Functional Obfuscation in a Self-Decoding Unix Shell Archive)</h4>
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<p>James A. Woods<br />
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Universities Space Research Association<br />
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NASA Ames Research Center</p>
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<hr />
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<blockquote>
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<p>“Use an algorithm, go to jail.”</p>
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<p>– anon., circa 1988, pre-<a href="https://en.wikipedia.org/wiki/Morris_worm">Morris worm</a> era</p>
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</blockquote>
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<hr />
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<p>Myriad formats have been proposed for network-mailable data. A major difficulty
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undermining the popularity of most file/message bundlers is that the sender
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assumes prior installation of the computational dual of such bundling software
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by the receiver. Command shell archives alleviate this problem somewhat, but
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still require standardization for the function of data compression and
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mail-transparency encoding. On Unix, these coding format quandaries are overcome
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by planting a novel <a href="https://en.wikipedia.org/wiki/Trojan_horse_(computing)">Trojan
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Horse</a> in the archive
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header to perform negotiation-less decoding.</p>
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<p>Specifically, we outline the development of an extraordinarily compact portable
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bundler/extractor to (dis)assemble data-compressed, binary-to-ASCII-converted,
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length-split, and checksummed directory structures using standard Unix tools.
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Miniature versions of counterparts to a Lempel-Ziv coder (<code>compress</code> or
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<code>squeeze</code>) and an efficient bit packetizer (<code>btoa</code>) are compiled on-the-fly at
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mail destination sites where they may not already exist. These are written in
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purposefully obfuscated-C to accompany similarly-shrunk shell command glue. This
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resulting shell archiver is dubbed <code>shark</code>.</p>
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<p><code>shark</code> procedure overhead consumes as few as three dozen shell commands (or
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<code>~1100</code> bytes), commensurate with the size of many Internet mail headers; it
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amortizes favorably with message size. <code>shark</code> is portable across Unix
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variants, while the underlying technique is inherently generalizable to other
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encoding schemes.</p>
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<p>In the function-theoretic sense of minimal Chaitin/Kolmogorov complexity, and
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within a modified Shannon model of communication, the ‘shark’ effort aims to
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construct a “shortest program” for source decoding in the Turing-universal Unix
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environment.</p>
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<hr />
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<blockquote>
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<p>Oh, the shark has pretty teeth, dear–<br />
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And he shows them pearly white<br />
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Just a jackknife has Macheath, dear–<br />
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And he keeps it out of sight.<br />
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<br />
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– Bertolt Brecht, Threepenny Opera</p>
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</blockquote>
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<hr />
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<h3 id="portability">Portability</h3>
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<p>We have ported this program to a wide variety of systems. Among
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these are:</p>
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<ul>
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<li>SunOS 4.1 / Sun SPARCstation 1 (using both ‘cc’ and ‘gcc 1.37.1’)</li>
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<li>SunOS 4.0.3 / Sun 3</li>
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<li>BSD 4.3 / VAX 8650</li>
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<li>SEIUX / Sumitomo Electric Ustation/S</li>
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<li>Sony NEWS-OS 3.3 / Sony NEWS (fairly vanilla 4.3BSD)</li>
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<li>System V.? / Hitachi 2050</li>
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<li>System V.? / NEC EWS 4800</li>
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<li>UNIOS-B / Omron Luna</li>
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<li>Dynix / Sequent Balance (‘cc’ for Natl. Semi. base + ‘gcc 1.36’)</li>
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<li>Unicos / Cray 2</li>
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</ul>
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<h3 id="obfuscation">Obfuscation</h3>
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<p>We (the authors) feel this program is obfuscated for the
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following reasons:</p>
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<ol start="0" type="1">
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<li><p>This is one of the few programs you’ll see <em>WHOSE VERY UTILITY DEPENDS ON ITS
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OBFUSCATION</em>!</p></li>
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<li><p>The contest entry may be used to send its wonderful self to anyone in the
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Unix world! Virus writers need not apply…</p></li>
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<li><p>The basic idea is twisted enough to be patentable, but is, out of the
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kindness of our hearts (as well as to maintain eligibility for the large IOCCC
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prize fund), dedicated to the public domain. Claude Shannon, meet Alan Turing.</p></li>
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<li><p>Meta-obfuscation is via obfuscated description (see <em>ABSTRACT</em>).</p></li>
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<li><p>“Literary” allusion. Production code contains a reference to self-reference,
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preserved at amazing cost for sheer perversity.</p></li>
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<li><p>Many, many micro obfuscations below, honed over three years time, in shell as
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well as C. Ask about the ‘tar’ pit escape, the <code>argv[0]</code> flip, Paul’s
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<code>&4294967295</code> portability hack, the “void where prohibited by flaw” fix, the
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<code>scanf()</code> space-saver, shift shenanigans, signal madness, <code>exit()</code>ing stage
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left, and source-to-source transformations galore.</p></li>
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</ol>
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<h3 id="for-extra-credit">For extra credit:</h3>
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<p>Construct <code>sharkmail</code>, to auto-split <code>sharkives</code> into mailable segments and mail
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them. Here’s a simple one, which could be extended to enable auto-reassembly
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with one shell cmd at the far end.</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="co">#!/bin/sh</span></span>
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<span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a><span class="va">m</span><span class="op">=</span><span class="va">$1</span><span class="kw">;</span> <span class="bu">shift</span></span>
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<span id="cb6-3"><a href="#cb6-3" aria-hidden="true" tabindex="-1"></a><span class="ex">shark</span> <span class="va">$*</span> <span class="kw">|</span> <span class="fu">split</span> <span class="at">-800</span> <span class="at">-</span> /tmp/shark<span class="va">$$</span></span>
|
||
<span id="cb6-4"><a href="#cb6-4" aria-hidden="true" tabindex="-1"></a><span class="va">n</span><span class="op">=</span><span class="kw">`</span><span class="fu">ls</span> /tmp/shark<span class="va">$$</span><span class="pp">*</span> <span class="kw">|</span> <span class="fu">wc</span> <span class="at">-l</span> <span class="kw">|</span> <span class="fu">sed</span> <span class="st">'s/ *//'</span><span class="kw">`</span></span>
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||
<span id="cb6-5"><a href="#cb6-5" aria-hidden="true" tabindex="-1"></a><span class="va">p</span><span class="op">=</span>0</span>
|
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<span id="cb6-6"><a href="#cb6-6" aria-hidden="true" tabindex="-1"></a><span class="cf">for</span> f <span class="kw">in</span> <span class="kw">`</span><span class="fu">ls</span> /tmp/shark<span class="va">$$</span><span class="pp">*</span><span class="kw">`</span></span>
|
||
<span id="cb6-7"><a href="#cb6-7" aria-hidden="true" tabindex="-1"></a><span class="cf">do</span></span>
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<span id="cb6-8"><a href="#cb6-8" aria-hidden="true" tabindex="-1"></a> <span class="va">p</span><span class="op">=</span><span class="kw">`</span><span class="fu">expr</span> <span class="va">$p</span> + 1<span class="kw">`</span></span>
|
||
<span id="cb6-9"><a href="#cb6-9" aria-hidden="true" tabindex="-1"></a> <span class="ex">mail</span> <span class="at">-s</span> <span class="st">"bundle (</span><span class="va">$p</span><span class="st"> of </span><span class="va">$n</span><span class="st">) from '</span><span class="kw">`</span><span class="fu">whoami</span><span class="kw">`</span><span class="st">'"</span> <span class="va">$m</span> <span class="op"><</span> <span class="va">$f</span></span>
|
||
<span id="cb6-10"><a href="#cb6-10" aria-hidden="true" tabindex="-1"></a><span class="cf">done</span></span>
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<span id="cb6-11"><a href="#cb6-11" aria-hidden="true" tabindex="-1"></a><span class="fu">rm</span> /tmp/shark<span class="va">$$</span><span class="pp">*</span></span></code></pre></div>
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<h3 id="shark-history">Shark history:</h3>
|
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<ul>
|
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<li><p>May 1987: Karl Fox introduces 1023-byte <code>zcat.c</code> to USENET.
|
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It’s too late for the 4th IOCCC.</p></li>
|
||
<li><p>May 21, 1987: James A. Woods extends idea to construct self
|
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decompressing <code>shar</code> Trojan horse, utilizing <code>cc</code>, <code>shar</code>,
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<code>zcat</code>, & <code>btoa</code>; size: 2303 bytes.</p></li>
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<li><p>May 23, 1987: <code>jaw</code> trims 250 bytes without much thought.</p></li>
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<li><p>June 2, 1987: 52 lines of shell, 1991 bytes, now made with <code>tar</code>,
|
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short-circuit C-compile at far end, dual-use main.c,
|
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portability mods. (jaw)</p></li>
|
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<li><p>Mar-May 1988: abortive run at 5th IOCCC.
|
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<code>jaw.c</code> - 1529 bytes. compile line: 152 bytes.
|
||
generated funny code with <code>execvp()</code> to invoke shell.</p></li>
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<li><p>Aug 29, 1988: production version, now at 1830 bytes.</p></li>
|
||
<li><p>Jan 1990: Paul Eggert does tour-de-force shark re-engineering.</p></li>
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<li><p>May 24, 1990: collaboration yields 999-byte <code>jaw.c</code> core (see above)
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and 1530-byte production shell code (w/comments).
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Eggert comes through with lion’s share of improvements.
|
||
7th IOCCC code now faster than the <code>btoa</code>/<code>zcat</code> it replaces.</p></li>
|
||
<li><p>May 1990: <code>jaw</code> develops experimental replacement using
|
||
Dan Bernstein’s high-compression ‘squeeze’.</p></li>
|
||
</ul>
|
||
<p>To which we add:</p>
|
||
<ul>
|
||
<li>June 1990: <code>shark</code> wins the IOCCC, finally! :-)</li>
|
||
</ul>
|
||
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|
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|
||
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||
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|
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|
||
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|
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<h1 id="inventory-for-1990jaw"><a name="inventory"></a>Inventory for 1990/jaw</h1>
|
||
<p><a href="#top">Jump to top</a></p>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/jaw/jaw.c">jaw.c</a> - entry source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/jaw/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/jaw/jaw.orig.c">jaw.orig.c</a> - original source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/jaw/try.sh">try.sh</a> - how to run</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/jaw/btoa">btoa</a> - bota utility</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/jaw/shark.sh">shark.sh</a> - shark utility with embedded source</li>
|
||
<li><a href="1990_jaw.tar.bz2">1990_jaw.tar.bz2</a> - download entry</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="index.html">index.html</a> - entry home page</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/jaw/README.md">README.md</a> - markdown source for index.html</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/jaw/.entry.json">.entry.json</a> - description of entry in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/jaw/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
|
||
<li><a href=".path">.path</a> - directory path from top directory</li>
|
||
</ul>
|
||
|
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<!--
|
||
|
||
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:
|
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|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
|
||
<div class="footer">
|
||
<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>
|
||
<h2>Coda</h2>
|
||
<p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1990%2Fjaw%2Findex.html">Nu HTML check this web page</a></p>
|
||
<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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