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Landon Curt Noll a1c86c8a7a add original C links to entry navigation bars
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<h1>The International Obfuscated C Code Contest</h1>
<h2>2015/muth - Most complete use of CPP</h2>
<h3>preprocessor Turing engine</h3>
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<a class="Left" href="../mills2/index.html">&larr; 2015/mills2</a>
<a class="Left" href="../index.html">&uarr; 2015 &uarr;</a>
<a class="Left" href="../schweikhardt/index.html">2015/schweikhardt &rarr;</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2015/muth/prog.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Dominik_Muth">Dominik Muth</a><br>
Location: <a href="../../location.html#DE">DE</a> - <em>Federal Republic of Germany</em> (<em>Germany</em>)</li>
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<h2 id="to-build">To build:</h2>
<pre><code> make</code></pre>
<h2 id="to-use">To use:</h2>
<pre><code> make -B [MACHINE=your_machine.h] [TAPE=your_tape.h] [X=[0|1|2|3|4|5|6|7|8|9]] [V=[0|1|2]] run</code></pre>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh</code></pre>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>This is something we were fearing all along: that the C preprocessor is Turing-complete
even without conditionals and recursive file inclusion as some kind of a
<a href="https://en.wikipedia.org/wiki/Rewriting">rewriting system</a>. Now we have the proof!</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<h3 id="preprocessor-turing-engine">Preprocessor Turing Engine</h3>
<h3 id="features">Features</h3>
<ul>
<li>Turing machine runs in preprocessor</li>
<li>universal (unlimited configurable states, symbols, and tape)</li>
<li>no <code>#if</code>s or other conditional directives, only <code>#define</code>s</li>
<li>no recursive <code>#include</code></li>
<li>single compiler run (no repeated preprocessing)</li>
<li>no variadic macros</li>
<li>verbosity levels:
<ul>
<li><code>V=0</code> (default) only prints the final tape</li>
<li><code>V=1</code> additionally prints one tilde character per machine step (slow)</li>
<li><code>V=2</code> additionally prints details on each machine step (slow; generates large files)</li>
</ul></li>
<li>make target <code>run</code> runs <code>./prog</code> and filters a little statistics out of the verbose output</li>
<li><code>X</code> (defaults to 3) sets the maximum number of steps: <em>M</em>(<code>X</code>) ~ 8<sup><code>X</code></sup></li>
</ul>
<h3 id="limitations">Limitations</h3>
<p>If the machine does not halt after <em>M</em>(<code>X</code>) steps, you will see unexpanded
macros in the output.</p>
<h3 id="compiler-warnings">Compiler warnings</h3>
<p>If <code>V=1</code> or <code>V=2</code> is used, you may see “<code>warning: string length is greater than the length '4095' ISO C99 compilers are required to support</code>”.</p>
<h3 id="programming">Programming</h3>
<p>Implementing your own Turing machine is easy. Take a look at the supplied header
files for examples.</p>
<h4 id="tape-symbols">Tape Symbols</h4>
<p>Every symbol used (except <code>_</code>) must be explicitly declared using</p>
<pre><code> #define sym_SYMBOL(sym, _SYMBOL) sym</code></pre>
<p>Example:</p>
<pre><code> #define sym_1(sym, _1) sym</code></pre>
<h4 id="tape">Tape</h4>
<p>The initial content of the tape must be defined in the tape header using a
triple like:</p>
<pre><code> #define tape ((((,),...l2), l1), c, (r1, (r2..., (,))))</code></pre>
<ul>
<li><code>l1</code>, <code>l2</code>, … are the symbols to the left</li>
<li><code>c</code> is the symbol at the current position</li>
<li><code>r1</code>, <code>r2</code>, … are the symbols to the right</li>
</ul>
<p>The empty pairs <code>(,)</code> represent the continuations of the tape, filled with
underscore symbols (<code>_</code>). They are expanded on demand.</p>
<h4 id="state-machine">State Machine</h4>
<p>All transitions are defined in the machine header using the syntax</p>
<pre><code> #define CURRENT_SCANNED (WRITE, MOVEMENT, NEXT)</code></pre>
<p>where</p>
<ul>
<li><code>CURRENT</code> is the current state.</li>
<li><code>SCANNED</code> is the symbol at the current position.</li>
<li>The whitespace before the parentheses is significant.</li>
<li><code>WRITE</code> is the symbol to be written to the tape.</li>
<li><code>MOVEMENT</code> is <code>L</code> for left, <code>R</code> for right; don’t specify anything if you
want no movement.</li>
<li><code>NEXT</code> is the next state.</li>
</ul>
<p>There must be a state <code>A</code> defined, which becomes the initial state of the
machine.</p>
<p>To halt the machine, use the keyword <code>break</code> as in</p>
<pre><code> #define A_1 (2, break)</code></pre>
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<h1 id="inventory-for-2015muth">Inventory for 2015/muth</h1>
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<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/prog.c">prog.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/prog.orig.c">prog.orig.c</a> - original source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/try.sh">try.sh</a> - script to try entry</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/machine_beaver_4_2.h">machine_beaver_4_2.h</a> - busy beaver Turing machine macros</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/machine_champ_2_4.h">machine_champ_2_4.h</a> - current champion Turing machine macros</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/machine_chaos_5_2.h">machine_chaos_5_2.h</a> - chaos Turing machine cpp macros</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/machine_cmplx_5_2.h">machine_cmplx_5_2.h</a> - complex Turing machine cpp macros</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/machine_count_5_2.h">machine_count_5_2.h</a> - counting Turing machine cpp macros</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/machine_gcd.h">machine_gcd.h</a> - greatest common divisor Turing machine cpp macros</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/machine_great_3_2.h">machine_great_3_2.h</a> - greater Turing machine cpp macros</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/machine_ioccc.h">machine_ioccc.h</a> - IOCCC Turing machine cpp macros</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/machine_nop.h">machine_nop.h</a> - minimal Turing machine cpp macros</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/machine_ru_2_4.h">machine_ru_2_4.h</a> - runner up Turing machine cpp macros</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/machine_times2.h">machine_times2.h</a> - multiply by 2 Turing machine cpp macros</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/tape_15_50.h">tape_15_50.h</a> - tape cpp macros</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/tape_77_55.h">tape_77_55.h</a> - tape cpp macros</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/tape_empty.h">tape_empty.h</a> - empty tape cpp macros</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/tape_five.h">tape_five.h</a> - tape cpp macros</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="2015_muth.tar.bz2">2015_muth.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2015/muth/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
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<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
src="../../png/by.png"
alt="person inside circle symbol">
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
src="../../png/sa.png"
alt="arrow looping back on itself inside circle symbol"><br>
You should <b>carefully review</b> the
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en"
target="_blank"
rel="license noopener noreferrer">CC BY-SA 4.0 LEGAL CODE</a></b>
before using the licensed material.<br>
You may wish to review the
<b><a href="../../license.html"
target="_blank"
rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
of <b>CC BY-SA 4.0</b>.<br>
</p>
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<div id="coda"><h3>Coda</h3>
<p>
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