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<h1>The International Obfuscated C Code Contest</h1>
<h2>1991/brnstnd - Best of Show</h2>
<h3>sorta stack language</h3>
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<a class="Left" href="../ant/index.html">← 1991/ant</a>
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/brnstnd.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Daniel_J_Bernstein">Daniel J. Bernstein</a><br>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
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<h2 id="to-build">To build:</h2>
<pre><code> make all</code></pre>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh
./sorta < sorta.itailrec</code></pre>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>For info on more examples, read the <a href="sorta.README.html">sorta.README.html</a> web page.</p>
<p>The author wished to win the “most useful program” award and documented this in
the source code. The judges were unmoved by this blatant attempt to influence
the contest and rejected this idea… so we gave it the “Best of Show”
instead!!</p>
<p><strong>NOTE</strong>: One should remove the final trailing newline to obtain the
original source file. This step is not needed to compile
this entry.</p>
<p>To have a chance to compile under a modern CPP, we had to
replace <code>#D</code> with <code>#define</code>.</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p>This is an interpreter for the programming language SORTA, a systems
and numerical programming language with features sorta from C, sorta
from FORTH, and sorta from Ada.</p>
<p>SORTA lets you manipulate files and spawn programs easily, has bitwise
operators, and gives you absolutely brilliant error messages like ‘?’
(that’s the C bit). SORTA programs work with a stack (that’s the FORTH
bit)—actually two stacks, one for integers and one for strings. And
all SORTA operations are strongly typed, detect practically any failure,
and garbage-collect (that’s the Ada bit).</p>
<p>SORTA also contains features you might not expect from such a small
interpreter: arbitrary-length string input and concatenation, for
instance, not to mention infinite-depth tail recursion.</p>
<p>SORTA ignores its arguments (though it makes them available to the
script); it takes all commands, character by character, from its
standard input. Unrecognized commands are repeated with a ‘?’.</p>
<p>SORTA maintains an <code>i</code> stack for integers and an <code>s</code> stack for strings. It also
keeps track of <code>programs</code>, one for each character. Operations are silently
ignored if the relevant stacks are too low, except as noted for <code>s</code>, <code>S</code>, and
<code>!</code>. If the <code>i</code> stack or <code>s</code> stack (or the stack of buffered macro commands)
grows too high, SORTA will exit silently with exit code 2. (Compile parameter
<code>-Do=250</code> controls what ‘too high’ means; you should not make <code>o</code> larger than
250.) I don’t think it’s possible to crash the interpreter.</p>
<p>Here, then, is the SORTA programming language. All non-digits delimit
numeric constants. Spaces and newlines are ignored except as numeric
delimiters.</p>
<h3 id="basic-operations">Basic operations</h3>
<ul>
<li><code>q</code>: quit</li>
<li><code>number</code>: push that number on top of the <code>i</code> stack</li>
<li><code>"string"</code>: push that string on top of the <code>s</code> stack, no length limit</li>
<li><code>[string]</code>: push that string on top of the <code>s</code> stack, no length limit</li>
<li><code>#</code>: make top of <code>i</code> stack non-destructively in ASCII, push result onto <code>s</code> stack</li>
<li><code>`</code>: print top of <code>s</code> stack non-destructively</li>
<li><code>$</code>: print top of <code>s</code> stack non-destructively without newline</li>
<li><code>d</code>: drop (pop) top of <code>i</code> stack</li>
<li><code>D</code>: dup (duplicate) top of <code>i</code> stack</li>
<li><code>'</code>: dup top of <code>s</code> stack</li>
<li><code>s</code>: pop top of <code>i</code> stack. If it is <code>n</code>, swap <code>(n+1)</code>th-top of <code>i</code> stack with top.
<code>1s</code>, for example, swaps the top two elements; <code>2s</code> swaps the top with the
third down; etc. This always pops the top of the <code>i</code> stack, even upon
failure.</li>
<li><code>S</code>: pop top of <code>i</code> stack, then act just like <code>s</code> but upon <code>s</code> stack</li>
<li><code>l</code>: pop top of <code>s</code> stack, push its length onto <code>i</code> stack</li>
<li><code>a</code>: push argc onto <code>i</code> stack</li>
<li><code>A</code>: pop top of <code>i</code> stack, push <code>argv[i]</code> on top of <code>s</code> stack</li>
<li><code>T</code>: concatenate top two elements of <code>s</code> stack</li>
<li><code>_</code>: negate top of <code>i</code> stack</li>
<li><code>+</code>: pop top two elements of <code>i</code> stack, add, push back sum</li>
<li><code>*</code>: pop top two elements of <code>i</code> stack, multiply, push back product</li>
<li><code>/</code>: pop top two elements of <code>i</code> stack, divide, push back quotient</li>
<li><code>></code>: pop top two elements of <code>i</code> stack, compare, push back 1 or 0 as in C</li>
<li><code>&</code>: pop top two elements of <code>i</code> stack, NAND, push back bitwise result
Note that NAND is sufficient to construct all bitwise operations, as
demonstrated by <code>icalc</code> in <a href="sorta.README.html">sorta.README.html</a>.</li>
</ul>
<h3 id="system-operations">System operations</h3>
<ul>
<li><code>o</code>: pop top of <code>s</code> stack and top two of <code>i</code> stack; <code>open(s1,i2,i1);</code> leave
result on <code>i</code> stack</li>
<li><code>O</code>: pop top of <code>i</code> stack, <code>close()</code> it</li>
<li><code>u</code>: pop top of <code>i</code> stack, <code>dup()</code> it, push result back on</li>
<li><code>F</code>: <code>fork()</code>, push result on <code>i</code> stack. This is not always safe while SORTA is
reading keyboard input or a script, as the forked programs share file
descriptors. It is always safe inside a program (see below).</li>
<li><code>P</code>: <code>pipe()</code>, push two ends <code><p0> <p1></code> onto <code>i</code> stack. In case of trouble,
<code>push <?> <-1></code> onto <code>i</code> stack.</li>
<li><code>w</code>: <code>wait()</code>, push successful result (or <code>-1</code> if no children) on <code>i</code> stack</li>
<li><code>!</code>: <code>execvp()</code> top of the <code>s</code> stack. Arguments are the next things down on
the <code>s</code> stack, in reverse order from popping; the first character of
each string is lopped off. There must be an empty string somewhere
in the <code>s</code> stack to terminate the argument list. If the <code>execve()</code>
fails, any operation involving current members of the <code>s</code> stack has
undefined effects, and <code>-1</code> is pushed onto the <code>i</code> stack.</li>
</ul>
<h3 id="high-level-language-operations">High-level language operations</h3>
<ul>
<li><code>:x</code>: copy the top of the <code>s</code> stack into a program labeled by character <code>x</code></li>
<li><code>=x</code>: pop the top of the <code>i</code> stack. If it was nonzero, execute the program
labeled by character <code>x</code>. Note that a digit at the end of a program
will merge with any digits after <code>=x</code>; in that case you usually want
to add a space at the end of the program.</li>
</ul>
<p>Common idioms: To drop the top of the <code>s</code> stack, <code>ld</code>. To do a <code><</code>, <code>1s></code>. To
unconditionally execute the program labeled by character <code>x</code>, <code>1=x</code> (or any
nonzero number followed by <code>=x</code>). To print the top of the <code>i</code> stack
non-destructively, <code>#</code> (or <code>#$</code> if you don’t want the newline). To
subtract, <code>_+</code>. To do mod or and or any of the other missing operations,
combine the available operations as illustrated below. To introduce a
comment, <code>[ this is a comment string which is promptly eliminated ]ld</code>.</p>
<p><code>SORTA</code>’s requirements: it wants <code>fork()</code>, <code>execvp()</code>, <code>open()</code>,
<code>close()</code>, <code>dup()</code>, <code>pipe()</code>, and <code>wait()</code>, so it obviously won’t even compile
on a non-UNIX machine. It also assumes that you have a size-256
character set and that the characters between <code>'0'</code> and <code>'9'</code> are exactly
the digits in order. It does <em>not</em> depend on ASCII, despite the code
appearance. Also note that SORTA does not attempt to declare <code>malloc()</code>,
so you will get some warnings about illegal pointer combinations. Also
note that there are unreachable statements in SORTA.</p>
<p>While the program source of course depends highly on <code>#define</code>s for
obfuscation, I like to think that this code has those little touches,
those professionally sharpened edges that mark true software
engineering. Observe, for instance, how <code>i</code> and <code>s</code> are the string and
integer stacks respectively. It’s these little things that make you
feel at home in an otherwise utterly useless piece of code. They’re
what make an obfuscation work.</p>
<p>The character pool (<code>I</code> after cpp) makes it rather painful to
see the effect of commands at a glance. I can just imagine people
spending hours bouncing between the pool and the rest of the code,
or accidentally changing the pool without realizing its importance.
Without documentation and example scripts, someone would find it
a challenge to figure out what the arrays are used for, let alone
that SORTA is a scripting language.</p>
<p>Another nice feature is that the SORTA language itself encourages you to write
not merely obfuscated but plain incomprehensible scripts (like the <a href="sorta.README.html">examples in
sorta.README.html</a> —after working with the language for a
while, I guess I can read it pretty easily, but I also think FORTH is a
beautiful language). The numbers running around everywhere will make people
think of ASCII, even though the code is not ASCII-dependent. What’s your first
thought when you see several <code>arrays[256]</code>? This is pretty standard obfuscation
otherwise. I like the way that unbalanced macro braces can throw off the reader
in <code>if(c>0){y+1]=z[c];</code>, and I had fun covering the alphabet with <code>#define</code>s,
but that’s nothing special.</p>
<p>Possible future extensions to SORTA include string extraction and
matching, reading from files into strings, and encrypting the string
pool to further confuse the judges. I don’t think I can fit this into
the size limit, unfortunately.</p>
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<div id="inventory">
<h1 id="inventory-for-1991brnstnd">Inventory for 1991/brnstnd</h1>
</div>
<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/brnstnd.c">brnstnd.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/brnstnd.orig.c">brnstnd.orig.c</a> - original source code</li>
<li><a href="sorta.README.html">sorta.README.html</a> - SORTA language README</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/try.sh">try.sh</a> - script to try entry</li>
<li><a href="try.txt">try.txt</a> - input file used by try.sh</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.i2+2">sorta.i2+2</a> - SORTA source</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.iarg0">sorta.iarg0</a> - SORTA source</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.icalc">sorta.icalc</a> - SORTA source</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.idup">sorta.idup</a> - SORTA source</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.iecho">sorta.iecho</a> - SORTA source</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.ifact1">sorta.ifact1</a> - SORTA source</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.ifact2">sorta.ifact2</a> - SORTA source</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.ifact3">sorta.ifact3</a> - SORTA source</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.iio">sorta.iio</a> - SORTA source</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.irot13">sorta.irot13</a> - SORTA source</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.isleep">sorta.isleep</a> - SORTA source</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.itailrec">sorta.itailrec</a> - SORTA source</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.iwhosort">sorta.iwhosort</a> - SORTA source</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="1991_brnstnd.tar.bz2">1991_brnstnd.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/.path">.path</a> - directory path from top level directory</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.README.md">sorta.README.md</a> - markdown source for sorta.README.html</li>
<li><a href="index.html">index.html</a> - this web page</li>
</ul>
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<h4>
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<div id="coda"><h3>Coda</h3>
<p>
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