Landon Curt Noll
cbc022d864
The inc/footer.default.html now has a common Copyright and CC BY-SA 4.0 License section for all generated HTML files. All markdown files have a similar Copyright and CC at the bottom in the form of an HTML comment.
298 lines
14 KiB
HTML
298 lines
14 KiB
HTML
<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<link rel="stylesheet" href="../../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>1991/dds - Most Well Rounded</title>
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<meta name="description" content="1991 IOCCC entry dds - Most Well Rounded">
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<meta name="keywords" content="IOCCC, 1991, IOCCC 1991, IOCCC entry, dds, Most Well Rounded">
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</head>
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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>1991/dds - Most Well Rounded</h2>
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</div>
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<div class="topnav">
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<a class="Left" href="../davidguy/index.html">← davidguy</a>
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<a class="Left" href="../index.html">↑ 1991 ↑</a>
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<a class="Left" href="../fine/index.html">fine →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/1991/dds/dds.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/1991/dds/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
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</div>
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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="../../index.html">IOCCC Home</a>
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<a href="../../years.html">Winning Entries</a>
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<a href="../../authors.html">People who have won</a>
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<a href="../../location.html">Location of authors</a>
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</div>
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<hr>
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<div class="sidenav">
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<a href="../../news.html">IOCCC News</a>
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<a href="../../status.html">Contest status</a>
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<a href="../../faq.html#submit">How to enter the IOCCC</a>
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<a href="../../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="../../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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<a href="../../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="../../judges.html">The IOCCC Judges</a>
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<a href="../../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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<a name="content"></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#Diomidis_Spinellis">Diomidis Spinellis</a><br>
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Location: <a href="../../location.html#GR">GR</a> - <em>Hellenic Republic</em> (<em>Greece</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="to-use">To use:</h2>
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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="ex">./dds</span> basic_program</span>
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<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a><span class="ex">./a.out</span> <span class="dv">2</span><span class="op">></span>/dev/null</span></code></pre></div>
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<h2 id="try">Try:</h2>
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<p>The author suggests trying:</p>
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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">./dds</span> LANDER.BAS</span>
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<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a><span class="ex">./a.out</span></span></code></pre></div>
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<p>Notice that a file <code>a.c</code> has been generated. Can you tell how <code>a.c</code> was
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produced? How does <code>a.c</code> relate to <a href="LANDER.BAS">LANDER.BAS</a>?</p>
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<p>What happens if you give the program a C program like itself? 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">./dds</span> dds.c</span></code></pre></div>
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<p>You’ll get errors yes but what does the generated file look like? What about
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other types of files?</p>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>This obfuscated program translates BASIC programs into obfuscated
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C programs by way of an obfuscated algorithm.</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<p>This program is a companion to the <a href="../../1990/dds/index.html">1990/dds</a>
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1990 DDS-BASIC interpreter program. This compiles BASIC programs into compilable C code
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and then compiles it. The input format is almost identical to the input format
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of the DDS-BASIC interpreter. The program needs an executable C compiler called
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<code>cc</code> in your path in order to work.</p>
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<h3 id="program-commands">Program commands:</h3>
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<ul>
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<li>variable names <code>A</code> to <code>Z</code></li>
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<li>FOR var = exp TO exp</li>
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<li>GOSUB exp</li>
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<li>GOTO exp</li>
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<li>INPUT variable</li>
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<li>PRINT exp</li>
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<li>REM any text</li>
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<li>variables initialized to 0 on RUN</li>
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<li>NEXT variable</li>
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<li>RETURN</li>
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<li>IF exp THEN exp</li>
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<li>PRINT string</li>
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<li>var = exp</li>
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<li>END</li>
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</ul>
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<p>Expressions are the same as the expressions of the C language.
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Many system calls and C library calls can be used.</p>
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<h3 id="input-format">Input format:</h3>
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<ul>
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<li>Free format positioning of tokens on the line.</li>
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<li>No space is allowed before the line number.</li>
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<li>Exactly one space is needed after the <code>FOR</code> and <code>NEXT</code> tokens.</li>
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<li>ALL INPUT MUST BE UPPERCASE.</li>
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</ul>
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<h3 id="error-checking-error-reports">Error checking / error reports:</h3>
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<p>The compiler silently ignores many errors.
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Other errors may produce errors in later phases of the compilation.</p>
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<h3 id="can-you-figure-out-how-the-compiler-works">Can you figure out how the compiler works?</h3>
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<h4 id="hint">Hint:</h4>
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<p>The compiler is NOT written in C, so this is really a meta-obfuscated
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program. The C code is an interpreter for the four register, seven
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instruction <code>COGNIMP$</code> machine that is contained in the <code>s</code> string.
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(<code>COGNIMP$</code> is named after the symbolic names of the seven instructions it
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defines (<code>Copy</code>, <code>Output</code>, <code>Goto</code>, <code>iNcrement</code>, <code>If</code>, <code>Match</code> and <code>Print</code>).</p>
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<p>The <code>$</code> sign is used for labels. The actual compiler is written in <code>COGNIMP$</code>.
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Browsing through the <code>COGNIMP$</code> code we encourage you to examine the loops for
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scanning the expression in the <code>IF</code> statement and the way a decision tree is
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implemented in order to match the statements. (Of course the <code>s</code> string is
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encoded by adding one to every character of it just to confuse you).</p>
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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-1991dds"><a name="inventory"></a>Inventory for 1991/dds</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/1991/dds/dds.c">dds.c</a> - entry source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/dds/Makefile">Makefile</a> - entry Makefile</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/dds/dds.orig.c">dds.orig.c</a> - original source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/dds/LANDER.BAS">LANDER.BAS</a> - BASIC source code</li>
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<li><a href="1991_dds.tar.bz2">1991_dds.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/1991/dds/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/1991/dds/.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/1991/dds/.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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</ul>
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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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<div class="footer">
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<h2>Copyright and CC BY-SA 4.0 License</h2>
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<p>This file and web page is:</p>
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<blockquote><b>Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.</b></p></blockquote>
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<p>You are free to share and adapt this file under the terms of this license:</p>
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||
<blockquote><b>Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)</b></blockquote>
|
||
<p>For more information, see:</p>
|
||
<blockquote><a
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||
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%2F1991%2Fdds%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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</div>
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