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<h1>The International Obfuscated C Code Contest</h1>
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<h2>1993/vanb - Most irregular expression</h2>
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<a class="Left" href="../schnitzi/index.html">← schnitzi</a>
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<a class="Left" href="../index.html">↑ 1993 ↑</a>
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<a class="Left Disabled" href="#">last entry</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/vanb.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1993%2Fvanb%2Findex.html">✓</a>
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<h2 id="author">Author:</h2>
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<ul>
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<li>Name: <a href="../../authors.html#David_Van_Brackle">David Van Brackle</a><br>
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Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
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<!-- BEFORE: 1st line of markdown file: 1993/vanb/README.md -->
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<h2 id="to-build">To build:</h2>
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<pre><code> make all</code></pre>
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<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
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||
<p>The current status of this entry is:</p>
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||
<blockquote>
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<p><strong>STATUS: INABIAF - please DO NOT fix</strong></p>
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||
</blockquote>
|
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<p>For more detailed information see <a href="../../bugs.html#1993_vanb">1993/vanb in bugs.html</a>.</p>
|
||
<h2 id="to-use">To use:</h2>
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<pre><code> ./vanb 'exp'</code></pre>
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||
<p>where <code>exp</code> is an octal expression. See below for how it can also have
|
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hexadecimal and decimal numbers.</p>
|
||
<h2 id="try">Try:</h2>
|
||
<pre><code> ./try.sh</code></pre>
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||
<p>What happens if you use something other than valid digits?</p>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>The octal expression may contain:</p>
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||
<ul>
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||
<li>unary operators: <code>+</code>, <code>-</code></li>
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<li>binary operators: <code>+</code>, <code>-</code>, <code>*</code>, <code>/</code>, <code>%</code></li>
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<li>hex numbers: <code>x</code> or <code>X</code> followed by hex digits</li>
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||
<li>decimal numbers: <code>d</code> or <code>D</code> followed by decimal digits</li>
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<li>octal numbers: octal digits</li>
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<li>grouping: <code>()</code></li>
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||
</ul>
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||
<p>No spaces are allowed in the expression. To avoid shell expansion,
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one should surround the expression in single quotes.</p>
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||
<p>It is a good thing that this program consists of only one
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expression, otherwise it might become hard to understand. :-)</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<p>The program does no error checking - erroneous expressions will
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produce spurious results. Note that unary <code>-</code> is an operator. Thus,
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decimal <code>-46</code> would be entered as <code>-d46</code> and not <code>d-46</code>.</p>
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||
<h3 id="what-makes-this-program-special">What Makes This Program Special:</h3>
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<ol start="0" type="1">
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<li><p>Of course, the fact that the program takes input and produces output in
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octal, rather than a more useful system like decimal, makes it “special”.</p></li>
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<li><p>The entire program consists of a single expression, returned from <code>main()</code>.</p></li>
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||
<li><p>There are no global or local variables other than the parameters to <code>main()</code>.</p></li>
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<li><p>All of the constants in the program are expressed in octal - including the
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<code>printf(3)</code> string.</p></li>
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<li><p>The variables are given names which cause visual confusion with the octal
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constants.</p></li>
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<li><p>The program is formatted like a Roman numeral 8. The significance of 8 is
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obvious. I chose Roman numerals because it is a numbering system even more
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arcane than octal. It’s not very ‘deceptive’, but it’s difficult to deceptively
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format a program which has no explicit control structures (other than <code>?:</code>s).</p></li>
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<li><p>Many simple tasks are done many times. I tried to do these differently each
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time, to make the program harder to understand.</p></li>
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</ol>
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<h3 id="how-it-works">How It Works:</h3>
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<p>It’s a recursive descent parser, calling <code>main()</code>
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for all of its recursion. <code>O2</code> is a state variable, telling <code>main()</code>
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what grammar non-terminal to parse. <code>**O7</code> is the next character.
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<code>O3</code> is an intermediate result. Whenever you see a construct like:</p>
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<pre><code> !(expression with O2)?</code></pre>
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<p>it’s decrementing and testing <code>O2</code> to see what state it’s in. Comparisons
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involving <code>**O7</code> and octal constants are looking for certain characters.</p>
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<p>Here’s the grammar (<code>'e'</code> denotes the empty string) :</p>
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<pre><code> <E> ::= <T><E'>
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<E'> ::= +<T><E'> |
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-<T><E'> | e
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<T> ::= <F><T'>
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<T'> ::= *<F><T'> |
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/<F><T'> |
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%<F><T'> | e
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<F> ::= +<F> |
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-<F> |
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(<E><C> |
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d<D> |
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D<D> |
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||
x<X> |
|
||
X<X> |
|
||
<O>
|
||
<C> ::= )
|
||
<D> ::= [0-9]<D> |
|
||
e
|
||
<X> ::= [0-9]<X> |
|
||
[A-F]<X> |
|
||
[a-f]<X> |
|
||
e
|
||
<O> ::= [0-7]<O> |
|
||
e</code></pre>
|
||
<p>Here’s how the grammar nonterminals map to octal state numbers:</p>
|
||
<pre><code> <E> is 012
|
||
<E'> is 011
|
||
<T> is 010
|
||
<T'> is 07
|
||
<F> is 06
|
||
<C> is 013
|
||
<D> is 04
|
||
<X> is 05
|
||
<O> is 03</code></pre>
|
||
<p>Here’s a version of the program before it got formatted into the VIII,
|
||
augmented with comments showing where each state begins. <code>N1</code> and <code>N2</code> are
|
||
notes:</p>
|
||
<pre><code> #define O5 main
|
||
O5(O2,O7,O3)char**O7;
|
||
{
|
||
return
|
||
/* N1 */ !(O2+=~01+01) ?\
|
||
00:
|
||
/* N2 */ !(O2-=02>01) ?\
|
||
printf("\045\157\012",O5(012,O7+01,00)):
|
||
/* O */ !(O2-=02>>01) ?\
|
||
(**O7<=067 && **O7>057 ? O5(03,O7,*(*O7)++-060+010*O3):O3):
|
||
/* D */ !(O2-=-O3-~O3) ?\
|
||
(072>**O7 && 060<=**O7 ? O5(04,O7,012*O3-060+*(*O7)++):O3):
|
||
/* X */ !(O2-=!O3+!!O3) ?\
|
||
(**O7>057 && **O7<=071 ? O5(05,O7,*(*O7)+++O3*020-060):
|
||
**O7<=0106 && 0101<=**O7 ? O5(05,O7,020*O3+*(*O7)++-067):
|
||
0140<**O7 && **O7<0147 ? O5(05,O7,-0127+*(*O7)+++020*O3):O3):
|
||
/* F */ !(O2-=02-01) ?\
|
||
(**O7==050 ? 050**++*O7,O5(013,O7,O5(012,O7,00)):
|
||
**O7<056 && 054<**O7 ? 055**++*O7,-O5(06,O7,00):
|
||
054>**O7 && 052<**O7 ? 050**(*O7)++,O5(06,O7,00):
|
||
!(**O7^0170)||!(0130^**O7) ? *++*O7,O5(05,O7,00):
|
||
**O7==0144||**O7==0104 ? ++*O7,O5(04,O7,00):O5(03,O7,00)):
|
||
/* T' */ !--O2 ?\
|
||
(**O7==052 ? O5(07,O7,O3*(*++*O7,O5(06,O7,00))):
|
||
!(045-**O7) ? O5(07,O7,O3%(03+(*O7)++,O5(06,O7,00))):
|
||
!(**O7^057) ? O5(07,O7,O3/(03-*++*O7,O5(06,O7,00))):O3):
|
||
/* T */ !(O2+=01-02) ?\
|
||
O5(07,O7,O5(06,O7,00)):
|
||
/* E' */ !(O2+=-02/02) ?\
|
||
(!(**O7-053)?O5(011,O7,O3+(++*O7,O5(010,O7,00))):
|
||
!(055^**O7) ? O5(011,O7,O3-(03+*(*O7)++,O5(010,O7,00))):O3):
|
||
/* E */ !(O2-=0563&0215) ?\
|
||
O5(011,O7,O5(010,O7,00)):
|
||
/* C */ (++*O7,O3);
|
||
}</code></pre>
|
||
<p>Note <code>N1</code>: It should never enter this state, unless the user invokes the
|
||
program with no parameters, in which case it just returns 0.</p>
|
||
<p>Note <code>N2</code>: Since the program is properly invoked with 1 parameter, this is
|
||
the first state it will go into. This state just invokes
|
||
printf, and sends the parser to state <code>012</code> (which is <code><E></code>).</p>
|
||
<p>The <code>E</code> and <code>T</code> states work like this:</p>
|
||
<pre><code> int e(){ return eprime( t() ); }</code></pre>
|
||
<p>The <code>E'</code> and <code>T'</code> states work like this:</p>
|
||
<pre><code> int eprime( int intermediate )
|
||
{
|
||
if( ch == '+' )
|
||
{
|
||
ch = nextchar();
|
||
return eprime( intermediate + t() );
|
||
}
|
||
else return intermediate;
|
||
}</code></pre>
|
||
<p>The <code>D</code>, <code>X</code> and <code>O</code> states work like this (they assume that they’re initially
|
||
called with <code>0</code>):</p>
|
||
<pre><code> int octal( int intermediate )
|
||
{
|
||
if( ch>='0' && ch<='7' )
|
||
{
|
||
intermediate = intermediate * 8 + ch - '0';
|
||
ch = nextchar();
|
||
return octal( intermediate );
|
||
}
|
||
else return intermediate;
|
||
}</code></pre>
|
||
<p><code>F</code> and <code>C</code> work similarly.</p>
|
||
<!--
|
||
|
||
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:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
<!-- AFTER: last line of markdown file: 1993/vanb/README.md -->
|
||
|
||
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|
||
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|
||
|
||
<!-- START: this line starts content generated by: bin/output-index-inventory.sh -->
|
||
|
||
<div id="inventory">
|
||
<h1 id="inventory-for-1993vanb">Inventory for 1993/vanb</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/vanb.c">vanb.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/vanb.alt.c">vanb.alt.c</a> - alternate source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/vanb.orig.c">vanb.orig.c</a> - original source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/try.sh">try.sh</a> - script to try entry</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="1993_vanb.tar.bz2">1993_vanb.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/.path">.path</a> - directory path from top level directory</li>
|
||
<li><a href="index.html">index.html</a> - this web page</li>
|
||
</ul>
|
||
<hr style="width:10%;text-align:left;margin-left:0">
|
||
<h4>
|
||
Jump to: <a href="#">top</a>
|
||
</h4>
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||
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</div>
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||
<!-- START: this line starts content from: inc/footer.inventory.html -->
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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)
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||
|
||
For more information, see:
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|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
|
||
<div class="footer">
|
||
|
||
<div id="copyright"><h3>Copyright © 1984-2024 by Landon Curt Noll:
|
||
<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">Some Rights Reserved</a></h3>
|
||
<p>
|
||
This work is <b>licensed by Landon Curt Noll</b> under
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
|
||
target="_blank"
|
||
rel="license noopener noreferrer"
|
||
style="display:inline-block;">CC BY-SA 4.0</a></b>.
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/cc.png"
|
||
alt="cc inside circle symbol">
|
||
<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>
|
||
</div>
|
||
|
||
<div id="coda"><h3>Coda</h3>
|
||
<p>
|
||
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1993%2Fvanb%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
|
||
<a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a><br>
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||
</p>
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