build index.html for all winners
Updated manifest as per recent file changes. Updated winner `.winner.json` to reflect the manifest changes. Added [bin/all_run.sh](bin/all_run.sh) tool to run a command over all winning entries. These tools had slight improvements in the help usage message: * bin/gen-author.sh VERSION="1.3.1 2024-01-16" * bin/gen-inventory.sh VERSION="1.0.1 2024-01-16" * bin/pandoc_wrapper.sh VERSION="1.3.1 2024-01-16" * bin/subst.default.sh VERSION="1.1.1 2024-01-16" * bin/subst.winner-index.sh VERSION="1.1.1 2024-01-16" The `bin/readme2index.sh` tool was improved so that if the `index.html` file exists and the tool forms the exact same content, then the file `index.html` file is NOT touched. * bin/readme2index.sh VERSION="1.1 2024-01-16" We used the following command to generate `index.html` files for all winning entries: ```sh bin/all_run.sh -v 3 bin/readme2index.sh ``` NOTE: We have not (yet) built HTML files above the winner directory level (e.g., no year level nor top level HTML), nor have be built non-index HTML files for winners. NOTE: By default we are running `pandoc(1)` with: ``` --fail-if-warnings=true ``` This means that any problems with markdown to HTML generates an error. This is done to be sure that the HTML conversion is clean. We had to fix the following `README.md` files: * `2000/rince/README.md` The reference [^2] was never used. We made a guess that [^2] applies to the same spot as [^1]. Perhaps there is a better spot where [^2] applies? NOTE: For every reference, there MUST be some place where that reference is used. * 2012/vik/README.md The string "$...$" is assumed to be a TeX encoded string. NOTE: Every "$..$" needs to be backslashed as in "\$..\$". * 2018/burton1/README.md The reference [2] was duplicated. We changed the second [2] to [3]. NOTE: Every reference needs to have a unique number. * 2020/carlini/README.md The string "$...$" is assumed to be a TeX encoded string. NOTE: Every "$..$" needs to be backslashed as in "\$..\$". We also found 2 errors in the `author/author_handle.json` file set: * author/Anonymous_2001.json The `author/Anonymous_2001.json` file was missing. * author/Jari_Arkko.json The winner ID for `1989_jar.1` had a typo.
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<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<!-- START: two lines up starts content from: inc/top.default.html -->
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<!-- -->
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<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
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<!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
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@@ -6,27 +8,406 @@
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<!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
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<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
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<!-- -->
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<!-- file: 2018/burton1/index.html created by: fake.gen_index.sh version: 1.0.5 2023-10-31 -->
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<html lang="en">
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<!-- END: this line ends content from: inc/top.default.html -->
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<!-- -->
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<!-- This file was formed by the tool: bin/readme2index.sh version: 1.1 2024-01-16 -->
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<!-- -->
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<!-- START: this line starts content from: inc/head.default.html -->
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>2018 burton1</title>
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<meta name="description" content="IOCCC year: 2018 IOCCC winner: burton1 winner index page">
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<meta name="keywords" content="IOCCC,2018,burton1,winner index page">
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<link rel="stylesheet" href="/temp-test-ioccc/ioccc.css">
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>2018/burton1</title>
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<meta name="description" content="2018 IOCCC winner burton1">
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<meta name="keywords" content="IOCCC, 2018, IOCCC 2018, IOCCC winner, burton1">
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</head>
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<!-- END: this line ends content from: inc/head.default.html -->
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<!-- START: this line starts content from: inc/body.default.html -->
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<body>
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<h1>2018 burton1</h1>
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<!-- END: this line ends content from: inc/body.default.html -->
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<!-- START: this line starts content from: inc/header.default.html -->
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<p>XXX - fake content until readme2index is working - XXX</p>
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<div class="header">
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<img src="/temp-test-ioccc/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>2018/burton1</h2>
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</div>
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<hr style="width:50%;text-align:left;margin-left:0">
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<!-- END: this line ends content from: inc/header.default.html -->
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<!-- START: this line starts content from: inc/topnav.mid.html -->
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<!-- Start Nu Html Checker -->
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<p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2018%2Fburton1%2Findex.html">Nu Html check https://ioccc-src.github.io/temp-test-ioccc/2018/burton1/index.html</a></p>
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<!-- End Nu Html Checker -->
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<div class="topnav">
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<a class="Left" href="../bellard/index.html">← bellard</a>
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<a class="Left" href="../index.html">↑ 2018 ↑</a>
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<a class="Left" href="../burton2/index.html">burton2 →</a>
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<a class="Right" href="#inventory">Inventory</a>
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</div>
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<!-- END: this line ends content from: inc/topnav.mid.html -->
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<!-- START: this line starts content from: inc/begin-row.default.html -->
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<div class="row">
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<!-- END: this line ends content from: inc/begin-row.default.html -->
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<!-- START: this line starts content from: inc/begin-leftcolumn.default.html -->
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<div class="leftcolumn">
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<!-- END: this line ends content from: inc/begin-leftcolumn.default.html -->
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<!-- START: this line starts content from: inc/sidenav.default.html -->
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<div class="sidenav">
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<a href="#content">Jump to contents</a>
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</div>
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<hr>
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<div class="sidenav">
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<a href="/temp-test-ioccc/index.html">IOCCC Home</a>
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<a href="/temp-test-ioccc/years.html">Winning Entries</a>
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<a href="/temp-test-ioccc/winners.html">People who have won</a>
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</div>
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<hr>
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<div class="sidenav">
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<a href="/temp-test-ioccc/news.html">IOCCC News</a>
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<a href="/temp-test-ioccc/faq.html#submit">How to enter the IOCCC</a>
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<a href="/temp-test-ioccc/faq.html">FAQ</a>
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</div>
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<hr>
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<div class="sidenav">
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<a href="/temp-test-ioccc/bugs.html">Bugs & (mis)features</a>
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<a href="/temp-test-ioccc/faq.html#fix_a_winner">Fixing IOCCC winners</a>
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<a href="/temp-test-ioccc/faq.html#fix_web_site">Fixing the web site</a>
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<a href="/temp-test-ioccc/faq.html#fix_author">Fixing winner info</a>
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<a href="/temp-test-ioccc/thanks-for-help.html">Thanks for the help</a>
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</div>
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<hr>
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<div class="sidenav">
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<a href="/temp-test-ioccc/judges.html">The IOCCC Judges</a>
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<a href="/temp-test-ioccc/contact.html">Contacting the IOCCC</a>
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</div>
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<hr>
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<div class="sidenav">
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<a href="#top">Jump to top</a>
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</div>
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<!-- END: this line ends content from: inc/sidenav.default.html -->
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</div>
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<div class="rightcolumn">
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<!-- END: this line ends content from: inc/begin-rightcolumn.default.html -->
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<!-- START: this line starts content from: inc/before-content.default.html -->
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<a name="content"></a>
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<!-- END: this line ends content from: inc/before-content.default.html -->
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<!-- START: this line starts content generated by: bin/gen-author.sh -->
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<p><a name="author"><strong>Author:</strong></a> <br><br>Name: <a
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href="/temp-test-ioccc/winners.html#Dave_Burton">Dave Burton</a><br>
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Location: <a href="/temp-test-ioccc/location.html#US">US</a></p>
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<!-- END: next line ends content generated by: bin/gen-author.sh -->
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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></span></code></pre></div>
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<p>There is an alternate version of this entry. See <a
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href="#alternate-code">Alternate code</a> below.</p>
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<h2 id="to-use">To use:</h2>
|
||||
<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="ex">./prog</span> <span class="op"><</span> any-file</span></code></pre></div>
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<h2 id="try">Try:</h2>
|
||||
<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="alternate-code">Alternate code:</h2>
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||||
<p>An alternate version of this entry, <a
|
||||
href="prog.alt.c">prog.alt.c</a>, is provided This alternate code was
|
||||
supposed to compile without warnings, however with modern compilers this
|
||||
is no longer the case so it will only cleanly compile with
|
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<code>-Wno-</code> options.</p>
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||||
<h3 id="alternate-build">Alternate build:</h3>
|
||||
<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="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>prog.alt</code> as you would <code>prog</code>.</p>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>One line, one array, one loop and one statement but it prints many
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bytes. It won.</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<p>Feed this anything on <code>stdin</code>.</p>
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<p>The <a href="scripthd.sh">included script.sh</a> may be used as a
|
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driver program for this entry. It adds several nice-to-have features,
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and allows salt-to-taste customizability.</p>
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<p>This code has been compiled and tested on:</p>
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<ul>
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<li>OSX-10.11, gcc 4.2.1 and clang 3.0, -O0 and -O3</li>
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||||
<li>X86-Linux, gcc 4.1.2 and 4.8.4, -O0 and -O3</li>
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||||
<li>ARM-QEMU, gcc 4.8.4, -O0 and -O3</li>
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||||
<li>X86-FreeBSD 10.3, clang 3.4.1, -O0 and -O3</li>
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<li>TCC 0.9.26 (x86-64) (used as a proxy for <a
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||||
href="/years.html#2001_bellard">2001/bellard</a>)</li>
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||||
<li>UNIX V7 pcc (Johnson’s C compiler) on a <a
|
||||
href="http://simh.trailing-edge.com/">simulated PDP-11/45</a> (see
|
||||
spoiler for further detail)</li>
|
||||
</ul>
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||||
<div style="margin-bottom:60em;margin-top:4em">
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||||
<strong>Spoiler below; scroll down.</strong>
|
||||
</div>
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||||
<h3 id="spoiler">SPOILER:</h3>
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||||
<p>This started life as a personal challenge: write the shortest hex
|
||||
dump utility in C.</p>
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||||
<p>The self-imposed ground rules in the hunt for shortest:</p>
|
||||
<ul>
|
||||
<li>The code has to output correctly.</li>
|
||||
<li>No extraneous newlines, the code must be portable, and without
|
||||
bypassing the solution using <code>execve(2)</code>, or functions built
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||||
upon it (<code>system(3)</code>, <code>popen(3)</code>, etc).</li>
|
||||
</ul>
|
||||
<p>E.g:</p>
|
||||
<div class="sourceCode" id="cb5"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a>main<span class="op">(){</span>system<span class="op">(</span><span class="st">"hd"</span><span class="op">);}</span> <span class="co">// it's turtles all the way down!</span></span></code></pre></div>
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||||
<p>is not acceptable.</p>
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||||
<p>And, “output correctly” is the output format of this entry. QED.</p>
|
||||
<p>Early attempts ended up at a reasonably short 157 characters. This
|
||||
was too long for a one-liner, so it had to be formatted as something
|
||||
more interesting. This solution is pleasing, but a true one-liner was
|
||||
the hoped-for goal. Here is the 157 character version in it’s
|
||||
entirety:</p>
|
||||
<div class="sourceCode" id="cb6"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="dt">char</span> O<span class="op">,</span>o<span class="op">[</span> <span class="dv">20</span><span class="op">];</span>L<span class="op">(</span>O<span class="op">){</span></span>
|
||||
<span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a>putchar <span class="op">(</span> O<span class="op">+</span> <span class="dv">48</span><span class="op">+</span><span class="dv">39</span> <span class="op">*(</span><span class="dv">9</span><span class="op"><</span></span>
|
||||
<span id="cb6-3"><a href="#cb6-3" aria-hidden="true" tabindex="-1"></a>O<span class="op">));}</span> I<span class="op">(</span>O<span class="op">)</span> <span class="op">{</span>L<span class="op">(~</span> <span class="dv">15</span><span class="op">);</span></span>
|
||||
<span id="cb6-4"><a href="#cb6-4" aria-hidden="true" tabindex="-1"></a>O<span class="op">||</span> puts<span class="op">(</span>o<span class="op">);}</span> main <span class="op">(</span>l<span class="op">){</span></span>
|
||||
<span id="cb6-5"><a href="#cb6-5" aria-hidden="true" tabindex="-1"></a><span class="cf">for</span><span class="op">(;~(</span>l<span class="op">=</span>getchar<span class="op">())</span> <span class="op">;</span>I<span class="op">(</span>O</span>
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||||
<span id="cb6-6"><a href="#cb6-6" aria-hidden="true" tabindex="-1"></a><span class="op">&=</span><span class="dv">15</span> <span class="op">))</span>o<span class="op">[</span> O<span class="op">++</span> <span class="op">]=</span><span class="dv">4</span><span class="op"><</span></span>
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||||
<span id="cb6-7"><a href="#cb6-7" aria-hidden="true" tabindex="-1"></a><span class="op">(</span><span class="dv">4</span><span class="op">^</span>l <span class="op">>></span><span class="dv">5</span><span class="op">)</span> <span class="op">?</span>l<span class="op">:</span> <span class="dv">46</span><span class="op">,</span>L</span>
|
||||
<span id="cb6-8"><a href="#cb6-8" aria-hidden="true" tabindex="-1"></a><span class="op">(</span>l<span class="op">>></span> <span class="dv">4</span><span class="op">),</span>L <span class="op">(</span>l<span class="op">&</span><span class="dv">15</span><span class="op">);</span>O<span class="op">&&</span></span>
|
||||
<span id="cb6-9"><a href="#cb6-9" aria-hidden="true" tabindex="-1"></a>I<span class="op">(</span>o<span class="op">[</span> O<span class="op">]=</span><span class="dv">0</span> <span class="op">);}</span><span class="co">//157c</span></span></code></pre></div>
|
||||
<p>While thinking about this in the shower (you are not the only one
|
||||
that does this!) came the idea which reduced the code to just 119 chars.
|
||||
This dramatic reduction started to feel close to minimal, and the hunt
|
||||
resumed. The progression to the present size is interesting, and it is
|
||||
interesting that the same algorithm can be expressed so differently by
|
||||
slight rearrangement of its parts.</p>
|
||||
<div class="sourceCode" id="cb7"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="co">// 119</span></span>
|
||||
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a><span class="dt">char</span> O<span class="op">,</span>o<span class="op">[</span><span class="dv">20</span><span class="op">];</span>main<span class="op">(</span>l<span class="op">){</span><span class="cf">for</span><span class="op">(;~(</span>l<span class="op">=</span>getchar<span class="op">());</span>O<span class="op">||</span>puts<span class="op">(</span>o<span class="op">))</span>o<span class="op">[</span>O<span class="op">++]=</span>isprint<span class="op">(</span>l<span class="op">)?</span>l<span class="op">:</span><span class="dv">46</span><span class="op">,</span>O<span class="op">&=</span><span class="dv">15</span><span class="op">,</span>printf<span class="op">(</span><span class="st">"</span><span class="sc">%02x</span><span class="st"> "</span><span class="op">,</span>l<span class="op">);</span>O<span class="op">[</span>o<span class="op">]=</span><span class="dv">0</span><span class="op">;</span>O<span class="op">&&</span>puts<span class="op">(</span>o<span class="op">);}</span></span>
|
||||
<span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a><span class="co">// 116</span></span>
|
||||
<span id="cb7-4"><a href="#cb7-4" aria-hidden="true" tabindex="-1"></a><span class="dt">char</span> O<span class="op">,</span>o<span class="op">[</span><span class="dv">20</span><span class="op">];</span>main<span class="op">(</span>l<span class="op">){</span><span class="cf">for</span><span class="op">(;</span>O<span class="op">++[</span>o<span class="op">]=~(</span>l<span class="op">=</span>getchar<span class="op">())?</span><span class="dv">4</span><span class="op"><(</span><span class="dv">4</span><span class="op">^</span>l<span class="op">>></span><span class="dv">5</span><span class="op">)?</span>l<span class="op">:</span><span class="dv">46</span><span class="op">:</span><span class="dv">0</span><span class="op">;(</span>O<span class="op">&=</span><span class="dv">15</span><span class="op">)||</span>puts<span class="op">(</span>o<span class="op">))</span>printf<span class="op">(</span><span class="st">"</span><span class="sc">%02x</span><span class="st"> "</span><span class="op">,</span>l<span class="op">);</span>O<span class="op">></span><span class="dv">1</span><span class="op">&&</span>puts<span class="op">(</span>o<span class="op">);}</span></span>
|
||||
<span id="cb7-5"><a href="#cb7-5" aria-hidden="true" tabindex="-1"></a><span class="co">// 115</span></span>
|
||||
<span id="cb7-6"><a href="#cb7-6" aria-hidden="true" tabindex="-1"></a><span class="dt">char</span> O<span class="op">,</span>o<span class="op">[</span><span class="dv">20</span><span class="op">];</span>main<span class="op">(</span>l<span class="op">){</span><span class="cf">for</span><span class="op">(;</span>O<span class="op">[</span>o<span class="op">]=~(</span>l<span class="op">=</span>getchar<span class="op">())?</span><span class="dv">4</span><span class="op"><(</span><span class="dv">4</span><span class="op">^</span>l<span class="op">>></span><span class="dv">5</span><span class="op">)?</span>l<span class="op">:</span><span class="dv">46</span><span class="op">:</span><span class="dv">0</span><span class="op">;(</span>O<span class="op">=-~</span>O<span class="op">&</span><span class="dv">15</span><span class="op">)||</span>puts<span class="op">(</span>o<span class="op">))</span>printf<span class="op">(</span><span class="st">"</span><span class="sc">%02x</span><span class="st"> "</span><span class="op">,</span>l<span class="op">);</span>O<span class="op">&&</span>puts<span class="op">(</span>o<span class="op">);}</span></span>
|
||||
<span id="cb7-7"><a href="#cb7-7" aria-hidden="true" tabindex="-1"></a><span class="co">// 113</span></span>
|
||||
<span id="cb7-8"><a href="#cb7-8" aria-hidden="true" tabindex="-1"></a><span class="dt">char</span> O<span class="op">,</span>o<span class="op">[</span><span class="dv">20</span><span class="op">];</span>main<span class="op">(</span>l<span class="op">){</span><span class="cf">for</span><span class="op">(;~</span>l<span class="op">;(</span>O<span class="op">=~</span>l<span class="op">?</span>printf<span class="op">(</span><span class="st">"</span><span class="sc">%02x</span><span class="st"> "</span><span class="op">,</span>l<span class="op">),-~</span>O<span class="op">&</span><span class="dv">15</span><span class="op">:!</span>O<span class="op">)||</span>puts<span class="op">(</span>o<span class="op">))</span>O<span class="op">[</span>o<span class="op">]=~(</span>l<span class="op">=</span>getchar<span class="op">())?</span><span class="dv">4</span><span class="op"><(</span><span class="dv">4</span><span class="op">^</span>l<span class="op">>></span><span class="dv">5</span><span class="op">)?</span>l<span class="op">:</span><span class="dv">46</span><span class="op">:</span><span class="dv">0</span><span class="op">;}</span></span>
|
||||
<span id="cb7-9"><a href="#cb7-9" aria-hidden="true" tabindex="-1"></a><span class="co">// 112</span></span>
|
||||
<span id="cb7-10"><a href="#cb7-10" aria-hidden="true" tabindex="-1"></a><span class="dt">char</span> O<span class="op">,</span>o<span class="op">[</span><span class="dv">20</span><span class="op">];</span>main<span class="op">(</span>l<span class="op">){</span><span class="cf">for</span><span class="op">(;~</span>l<span class="op">;(</span>O<span class="op">=~</span>l<span class="op">?-~</span>O<span class="op">&</span>printf<span class="op">(</span><span class="st">"</span><span class="sc">%02x</span><span class="st"> "</span><span class="op">,</span>l<span class="op">)*</span><span class="dv">5</span><span class="op">:!</span>O<span class="op">)||</span>puts<span class="op">(</span>o<span class="op">))</span>O<span class="op">[</span>o<span class="op">]=~(</span>l<span class="op">=</span>getchar<span class="op">())?</span><span class="dv">4</span><span class="op"><(</span><span class="dv">4</span><span class="op">^</span>l<span class="op">>></span><span class="dv">5</span><span class="op">)?</span>l<span class="op">:</span><span class="dv">46</span><span class="op">:</span><span class="dv">0</span><span class="op">;}</span></span>
|
||||
<span id="cb7-11"><a href="#cb7-11" aria-hidden="true" tabindex="-1"></a><span class="co">// 111</span></span>
|
||||
<span id="cb7-12"><a href="#cb7-12" aria-hidden="true" tabindex="-1"></a><span class="dt">char</span> O<span class="op">,</span>o<span class="op">[</span><span class="dv">20</span><span class="op">];</span>main<span class="op">(</span>l<span class="op">){</span><span class="cf">for</span><span class="op">(;~</span>l<span class="op">;</span>O<span class="op">||</span>puts<span class="op">(</span>o<span class="op">))</span>O<span class="op">=(</span>O<span class="op">[</span>o<span class="op">]=~(</span>l<span class="op">=</span>getchar<span class="op">())?</span><span class="dv">4</span><span class="op"><(</span><span class="dv">4</span><span class="op">^</span>l<span class="op">>></span><span class="dv">5</span><span class="op">)?</span>l<span class="op">:</span><span class="dv">46</span><span class="op">:</span><span class="dv">0</span><span class="op">)?-~</span>O<span class="op">&</span>printf<span class="op">(</span><span class="st">"</span><span class="sc">%02x</span><span class="st"> "</span><span class="op">,</span>l<span class="op">)*</span><span class="dv">5</span><span class="op">:!</span>O<span class="op">;}</span></span>
|
||||
<span id="cb7-13"><a href="#cb7-13" aria-hidden="true" tabindex="-1"></a><span class="co">// 110</span></span>
|
||||
<span id="cb7-14"><a href="#cb7-14" aria-hidden="true" tabindex="-1"></a><span class="dt">char</span> O<span class="op">,</span>o<span class="op">[</span><span class="dv">0</span><span class="op">];</span>main<span class="op">(</span>l<span class="op">){</span><span class="cf">for</span><span class="op">(;~</span>l<span class="op">;</span>O<span class="op">||</span>puts<span class="op">(</span>o<span class="op">))</span>O<span class="op">=(</span>O<span class="op">[</span>o<span class="op">]=~(</span>l<span class="op">=</span>getchar<span class="op">())?</span><span class="dv">4</span><span class="op"><(</span><span class="dv">4</span><span class="op">^</span>l<span class="op">>></span><span class="dv">5</span><span class="op">)?</span>l<span class="op">:</span><span class="dv">46</span><span class="op">:</span><span class="dv">0</span><span class="op">)?-~</span>O<span class="op">&</span>printf<span class="op">(</span><span class="st">"</span><span class="sc">%02x</span><span class="st"> "</span><span class="op">,</span>l<span class="op">)*</span><span class="dv">5</span><span class="op">:!</span>O<span class="op">;}</span></span>
|
||||
<span id="cb7-15"><a href="#cb7-15" aria-hidden="true" tabindex="-1"></a><span class="co">// 109</span></span>
|
||||
<span id="cb7-16"><a href="#cb7-16" aria-hidden="true" tabindex="-1"></a><span class="dt">char</span> O<span class="op">,</span>o<span class="op">[];</span>main<span class="op">(</span>l<span class="op">){</span><span class="cf">for</span><span class="op">(;~</span>l<span class="op">;</span>O<span class="op">||</span>puts<span class="op">(</span>o<span class="op">))</span>O<span class="op">=(</span>O<span class="op">[</span>o<span class="op">]=~(</span>l<span class="op">=</span>getchar<span class="op">())?</span><span class="dv">4</span><span class="op"><(</span><span class="dv">4</span><span class="op">^</span>l<span class="op">>></span><span class="dv">5</span><span class="op">)?</span>l<span class="op">:</span><span class="dv">46</span><span class="op">:</span><span class="dv">0</span><span class="op">)?-~</span>O<span class="op">&</span>printf<span class="op">(</span><span class="st">"</span><span class="sc">%02x</span><span class="st"> "</span><span class="op">,</span>l<span class="op">)*</span><span class="dv">5</span><span class="op">:!</span>O<span class="op">;}</span></span></code></pre></div>
|
||||
<p>There are solutions without the ASCII sidebar that are significantly
|
||||
shorter. These do not compete in the same category, since their output
|
||||
is materially different. They are derived from the solutions above, but
|
||||
are still fascinating as concise utilities, so here is their
|
||||
progression, for the curious:</p>
|
||||
<div class="sourceCode" id="cb8"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a><span class="co">// 102</span></span>
|
||||
<span id="cb8-2"><a href="#cb8-2" aria-hidden="true" tabindex="-1"></a>I<span class="op">;</span>O<span class="op">(</span>O<span class="op">){</span>putchar<span class="op">(</span>O<span class="op">+</span><span class="dv">48</span><span class="op">+</span><span class="dv">39</span><span class="op">*(</span><span class="dv">9</span><span class="op"><</span>O<span class="op">));}</span>main<span class="op">(</span>l<span class="op">){</span><span class="cf">for</span><span class="op">(;~(</span>l<span class="op">=</span>getchar<span class="op">());</span>O<span class="op">(++</span>I<span class="op">&</span><span class="dv">15</span><span class="op">?~</span><span class="dv">15</span><span class="op">:~</span><span class="dv">37</span><span class="op">))</span>O<span class="op">(</span>l<span class="op">>></span><span class="dv">4</span><span class="op">),</span>O<span class="op">(</span>l<span class="op">&</span><span class="dv">15</span><span class="op">);</span>O<span class="op">(-</span><span class="dv">38</span><span class="op">);}</span></span>
|
||||
<span id="cb8-3"><a href="#cb8-3" aria-hidden="true" tabindex="-1"></a><span class="co">// 80</span></span>
|
||||
<span id="cb8-4"><a href="#cb8-4" aria-hidden="true" tabindex="-1"></a>O<span class="op">;</span>main<span class="op">(</span>l<span class="op">){</span><span class="cf">while</span><span class="op">(~(</span>l<span class="op">=</span>getchar<span class="op">()))</span>printf<span class="op">(</span><span class="st">"</span><span class="sc">%02x%c</span><span class="st">"</span><span class="op">,</span>l<span class="op">,++</span>O<span class="op">&</span><span class="dv">15</span><span class="op">?</span><span class="dv">32</span><span class="op">:</span><span class="dv">10</span><span class="op">);</span>O<span class="op">&</span><span class="dv">15</span><span class="op">&&</span>puts<span class="op">(</span><span class="st">""</span><span class="op">);}</span></span>
|
||||
<span id="cb8-5"><a href="#cb8-5" aria-hidden="true" tabindex="-1"></a><span class="co">// 78</span></span>
|
||||
<span id="cb8-6"><a href="#cb8-6" aria-hidden="true" tabindex="-1"></a>O<span class="op">;</span>main<span class="op">(</span>l<span class="op">){</span><span class="cf">for</span><span class="op">(;~</span>l<span class="op">;(</span>O<span class="op">=~(</span>l<span class="op">=</span>getchar<span class="op">())?</span>printf<span class="op">(</span><span class="st">"</span><span class="sc">%02x</span><span class="st"> "</span><span class="op">,</span>l<span class="op">),-~</span>O<span class="op">&</span><span class="dv">15</span><span class="op">:!</span>O<span class="op">)||</span>puts<span class="op">(</span><span class="st">""</span><span class="op">));}</span></span>
|
||||
<span id="cb8-7"><a href="#cb8-7" aria-hidden="true" tabindex="-1"></a><span class="co">// 77</span></span>
|
||||
<span id="cb8-8"><a href="#cb8-8" aria-hidden="true" tabindex="-1"></a>O<span class="op">;</span>main<span class="op">(</span>l<span class="op">){</span><span class="cf">for</span><span class="op">(;~</span>l<span class="op">;(</span>O<span class="op">=~(</span>l<span class="op">=</span>getchar<span class="op">())?-~</span>O<span class="op">&</span>printf<span class="op">(</span><span class="st">"</span><span class="sc">%02x</span><span class="st"> "</span><span class="op">,</span>l<span class="op">)*</span><span class="dv">5</span><span class="op">:!</span>O<span class="op">)||</span>puts<span class="op">(</span><span class="st">""</span><span class="op">));}</span></span>
|
||||
<span id="cb8-9"><a href="#cb8-9" aria-hidden="true" tabindex="-1"></a><span class="co">// 76</span></span>
|
||||
<span id="cb8-10"><a href="#cb8-10" aria-hidden="true" tabindex="-1"></a>O<span class="op">;</span>main<span class="op">(</span>l<span class="op">){</span><span class="cf">for</span><span class="op">(;~</span>l<span class="op">;</span>O<span class="op">||</span>puts<span class="op">(&</span>O<span class="op">))</span>O<span class="op">=~(</span>l<span class="op">=</span>getchar<span class="op">())?-~</span>O<span class="op">&</span>printf<span class="op">(</span><span class="st">"</span><span class="sc">%02x</span><span class="st"> "</span><span class="op">,</span>l<span class="op">)*</span><span class="dv">5</span><span class="op">:!</span>O<span class="op">;}</span></span></code></pre></div>
|
||||
<p>It is possible to reduce the size of each of these by one by eliding
|
||||
the trailing newline. This was not reported above since the newline kept
|
||||
getting appended by processing software, and it is more interesting to
|
||||
remove characters by changing code than by filtering:</p>
|
||||
<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="ex">$</span> tr <span class="at">-d</span> <span class="st">'\012'</span> <span class="op"><</span> 109.c <span class="kw">|</span> <span class="fu">wc</span> <span class="at">-c</span></span>
|
||||
<span id="cb9-2"><a href="#cb9-2" aria-hidden="true" tabindex="-1"></a><span class="ex">108</span></span>
|
||||
<span id="cb9-3"><a href="#cb9-3" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> tr <span class="at">-d</span> <span class="st">'\012'</span> <span class="op"><</span> 76.c <span class="kw">|</span> <span class="fu">wc</span> <span class="at">-c</span></span>
|
||||
<span id="cb9-4"><a href="#cb9-4" aria-hidden="true" tabindex="-1"></a><span class="ex">75</span></span>
|
||||
<span id="cb9-5"><a href="#cb9-5" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> tr <span class="at">-d</span> <span class="st">'\012'</span> <span class="op"><</span> 109.c <span class="kw">|</span> <span class="fu">cc</span> <span class="at">-o</span> 108 <span class="at">-xc</span> <span class="at">-</span></span>
|
||||
<span id="cb9-6"><a href="#cb9-6" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> verify 108</span>
|
||||
<span id="cb9-7"><a href="#cb9-7" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span></span></code></pre></div>
|
||||
<p>An obfuscated hex dump has been done before: <a
|
||||
href="/1986/bright/README.md">1986/bright</a> is similar in function,
|
||||
but it uses more characters in just setting up its obfuscation than this
|
||||
entire solution!</p>
|
||||
<h3 id="bigger-spoiler">BIGGER SPOILER:</h3>
|
||||
<p>If you are unhappy with the way DEL (character 127) is handled,
|
||||
replace the cryptic expression <code>4<(4^l>>5)?l:46</code>
|
||||
with <code>32>l|l>126?46:l</code>. Both take the same number of
|
||||
characters, but the former is a bit more interesting. Bonus question:
|
||||
how does the first expression work?</p>
|
||||
<h3 id="biggest-spoiler-and-some-history">BIGGEST SPOILER (and some
|
||||
history):</h3>
|
||||
<p>Technically, <code>char o[0];</code> is illegal (SS 6.7.6.2)
|
||||
according to ISO (N1570). And <code>char o[];</code> is a conditionally
|
||||
supported feature (SS 6.7.6.2, 6.10.8.3). However, it works in modern C
|
||||
implementations as an extension, including GCC, Clang and TCC, for X86
|
||||
and ARM, on multiple operating systems (Linux, OSX/macOS, FreeBSD), so
|
||||
it is <em>functionally</em> correct. MicroSoft Visual C++ does not allow
|
||||
<code>char o[]</code> or <code>char o[0]</code>, and implements its
|
||||
close relative <code>char o[1]</code> such that writing more than a
|
||||
single char will cause a fault, which is <em>technically</em>
|
||||
correct.</p>
|
||||
<p>But how does this work at all, even as an extension? <code>o[]</code>
|
||||
allocates one(!) byte in a zero-filled data area (formerly <a
|
||||
href="https://en.wikipedia.org/wiki/.bss">BSS</a>). The UNIX-derived
|
||||
systems this code was run upon all place the storage of <code>O</code>
|
||||
and <code>o</code> into a zero-filled VM page with nothing following:
|
||||
thus, there are plenty of available and unused zero bytes following
|
||||
<code>O</code>, addressed via <code>o</code>, and this code only needs
|
||||
17. This is <em>undefined</em> behavior, but as shown, it is widely
|
||||
available.</p>
|
||||
<p>The <a href="http://minnie.tuhs.org/cgi-bin/utree.pl">1979 Seventh
|
||||
Edition UNIX</a> (v7) system pre-dates the IOCCC by several years, and
|
||||
the source code to <code>sh</code>(1) was a <a
|
||||
href="/all/README.md">significant inspiration for this contest</a>.
|
||||
There are two C compilers present: <code>cc</code> written by Dennis
|
||||
Ritchie, and <code>pcc</code> written by Steven Johnson. The nested
|
||||
conditional expressions in 116 and smaller are too complex for
|
||||
<code>cc</code> (“Illegal conditional”) but <code>pcc</code> handles
|
||||
them correctly, and neither compiler accepts <code>char o[]</code> or
|
||||
<code>char o[0]</code> and neither put the bytes in a zero-filled page
|
||||
(as a paged VM was not yet written for UNIX).</p>
|
||||
<p>More significant is that v7 <code>printf(3)</code> does not report
|
||||
the number of characters written, and therefore 111 compiles but does
|
||||
not work correctly; 113 is the shortest code that compiles and runs
|
||||
correctly in Ancient UNIX.</p>
|
||||
<p>Interesting digression: v7 <code>printf</code> (<code>_doprnt</code>)
|
||||
was written in PDP-11 assembly. It pre-dates <code>varargs.h</code>, and
|
||||
assembly was the only way to gain access to the variable argument types.
|
||||
The first edition <em>The C Programming Language</em>, 1978, page 71,
|
||||
remarks:</p>
|
||||
<blockquote>
|
||||
<p>By the way, there is no entirely satisfactory way to write a portable
|
||||
function that accepts a variable number of arguments, because there is
|
||||
no portable way for the called function to determine how many arguments
|
||||
where actually passed to it in a given call. …<br />
|
||||
<code>printf</code>, the most common C function with a variable number
|
||||
of arguments, … is also non-portable and must be modified for different
|
||||
environments.</p>
|
||||
</blockquote>
|
||||
<p>It is fascinating to explore the roots of C through the history of
|
||||
the operating system it was birthed within. C is often criticized as a
|
||||
difficult, inscrutable language, but as this contest demonstrates, this
|
||||
is in parody. <em>Shell-gol</em> is one of those instances where someone
|
||||
<a href="http://ioccc.org/all/README">preferred a different
|
||||
language</a>, and (ab)used the preprocessor to re-mold C into something
|
||||
they found comfortable. Most of the rest of the system, especially in
|
||||
the kernel, are models of clarity and efficient expression.</p>
|
||||
<h3 id="tldr">TL;DR:</h3>
|
||||
<p>So which version is the shortest, portable hex dump?</p>
|
||||
<ul>
|
||||
<li>109 works with (most?) modern Unix-like systems and compilers, see
|
||||
example list above.</li>
|
||||
<li>111 works adds Microsoft, is standards-approved, and does not
|
||||
exploit undefined behavior.</li>
|
||||
<li>113 works on Ancient UNIX and the portable C compiler.</li>
|
||||
<li>119 works on all platforms, including the original Ritchie PDP-11 C
|
||||
compiler.</li>
|
||||
</ul>
|
||||
<h3 id="coda">Coda:</h3>
|
||||
<p>Clearly, the smallest possible program violates modern best practice.
|
||||
It is not even possible to compile cleanly, but it will compile
|
||||
correctly.</p>
|
||||
<p>Included is <a href="prog.alt.c">prog.alt.c</a>, a modern C
|
||||
implementation that is – perhaps – the smallest, clean-compiling version
|
||||
using <code>clang</code> or <code>gcc</code> with
|
||||
<code>-Wall -pedantic</code>. Note that while this is larger than all
|
||||
but the original attempt, it will <em>not</em> work with the original
|
||||
Ritchie PDP-11 C compiler, since the expression within the ternary
|
||||
remains too complex.</p>
|
||||
<p>Try:</p>
|
||||
<div class="sourceCode" id="cb10"><pre
|
||||
class="sourceCode sh"><code class="sourceCode bash"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="fu">cat</span> prog.c prog.alt.c</span></code></pre></div>
|
||||
<p>or</p>
|
||||
<div class="sourceCode" id="cb11"><pre
|
||||
class="sourceCode sh"><code class="sourceCode bash"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a><span class="fu">cmp</span> <span class="at">-b</span> prog.c prog.alt.c</span></code></pre></div>
|
||||
<p>to compare the differences (<code>diff</code> is not helpful on a
|
||||
one-liner).</p>
|
||||
<h2 id="copyright-and-cc-by-sa-4.0-license">Copyright and CC BY-SA 4.0
|
||||
License:</h2>
|
||||
<p>This file is Copyright (c) 2023 by Landon Curt Noll. All Rights
|
||||
Reserved. You are free to share and adapt this file under the terms of
|
||||
this license:</p>
|
||||
<pre><code>Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)</code></pre>
|
||||
<p>For more information, see:
|
||||
https://creativecommons.org/licenses/by-sa/4.0/</p>
|
||||
<!-- START: this line starts content generated by: bin/gen-inventory.sh -->
|
||||
|
||||
<h1 id="inventory-for-2018burton1"><a name="inventory"></a>Inventory for
|
||||
2018/burton1</h1>
|
||||
<h2 id="primary-files">Primary files</h2>
|
||||
<ul>
|
||||
<li><a href="index.html">index.html</a> - winner home page</li>
|
||||
<li><a
|
||||
href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2018/burton1/prog.c">prog.c</a>
|
||||
- winning source</li>
|
||||
<li><a
|
||||
href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2018/burton1/Makefile">Makefile</a>
|
||||
- winner Makefile</li>
|
||||
<li><a
|
||||
href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2018/burton1/prog.alt.c">prog.alt.c</a>
|
||||
- alternative source</li>
|
||||
<li><a
|
||||
href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2018/burton1/prog.orig.c">prog.orig.c</a>
|
||||
- original source</li>
|
||||
<li><a
|
||||
href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2018/burton1/scripthd.sh">scripthd.sh</a>
|
||||
- driver program - adds several nice-to-have features</li>
|
||||
<li><a
|
||||
href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2018/burton1/try.sh">try.sh</a>
|
||||
- how to run</li>
|
||||
<li><a href="2018_burton1.tar.bz2">2018_burton1.tar.bz2</a> - download
|
||||
winning source</li>
|
||||
</ul>
|
||||
<h2 id="secondary-files">Secondary files</h2>
|
||||
<ul>
|
||||
<li><a
|
||||
href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2018/burton1/.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>
|
||||
<li><a
|
||||
href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2018/burton1/.winner.json">.winner.json</a>
|
||||
- description of winner in JSON</li>
|
||||
<li><a
|
||||
href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2018/burton1/README.md">README.md</a>
|
||||
- markdown source for index.html</li>
|
||||
</ul>
|
||||
|
||||
<!-- END: next line ends content generated by: bin/gen-inventory.sh -->
|
||||
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|
||||
|
||||
<!-- END: this line ends content from: inc/after-content.default.html -->
|
||||
<!-- START: this line starts content from: inc/end-rightcolumn.default.html -->
|
||||
|
||||
</div>
|
||||
|
||||
<!-- END: this line ends content from: inc/end-rightcolumn.default.html -->
|
||||
<!-- START: this line starts content from: inc/end-row.default.html -->
|
||||
|
||||
</div>
|
||||
|
||||
<!-- END: this line ends content from: inc/end-row.default.html -->
|
||||
<!-- START: this line starts content from: inc/footer.default.html -->
|
||||
|
||||
<div class="footer">
|
||||
<hr>
|
||||
<h2>Coda</h2>
|
||||
<p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2018%2Fburton1%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>
|
||||
</div>
|
||||
|
||||
<!-- END: this line ends content from: inc/footer.default.html -->
|
||||
<!-- START: this line starts content from: inc/bottom.default.html -->
|
||||
|
||||
</body>
|
||||
</html>
|
||||
|
||||
<!-- END: this line ends content from: inc/bottom.default.html -->
|
||||
Reference in new issue
Block a user