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ioccc/1998/schnitzi/index.html
T
Cody Boone Ferguson 1ac055fa85 Reword the recent deobfuscation changes
In most cases the word was changed to 'obfuscation' as it was about
obfuscation, not deobfuscation. In some cases like 1995/leo since the
file was (in 1995/leo) about a secret switch it was changed to
'secret.md' (and 'secret.html') but there were others like that as well.

One entry had the words 'spoiling the size rule' but this had been
changed to 'deobfuscating the size rule' which was obviously wrong.

In the latter YYYY/README.md files the judges had written after some
entries (brief summaries) '...

    ...We'll stop spouting spoilers now. Have fun exploring all the
    entries!

but that was changed to:

    ...We'll stop spouting deobfuscation information now. Have fun
    exploring all the entries!

which wasn't really about deobfuscation but just a brief summary of what
the entries did.

And in the most problematic case (at least for me :-), 2018/ferguson) I
had put a joke in:

    ... but it's the only Easter egg I won't spoil

but it was changed to 'won't deobfuscate' which not only is not what it
is but it spoilt the joke.

In some cases the word was changed back to 'SPOILER' (or similar) but in
most cases not. I believe it should be better now. There are some
caveats, however, as below.

Although make find_missing_links is okay I do not remember if this will
catch links that refer to '%%REPO_URL%%' or other pandoc tokens. This
means I might have to go back to some earlier years to verify links are
okay. That should not take that much time I hope.

It might also be that some wording can still be improved some but it is
hoped this will be discovered when checking links and looking over the
manifest (which obviously changed).
2024-07-04 09:03:45 -07:00

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<h1>The International Obfuscated C Code Contest</h1>
<h2>1998/schnitzi - Best flow control</h2>
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<a class="Left" href="../fanf/index.html">&larr; fanf</a>
<a class="Left" href="../index.html">&uarr; 1998 &uarr;</a>
<a class="Left" href="../schweikh1/index.html">schweikh1 &rarr;</a>
<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1998/schnitzi/schnitzi.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Mark_Schnitzius">Mark Schnitzius</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>
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
<p>The current status of this entry is:</p>
<pre><code> STATUS: INABIAF - please DO NOT fix</code></pre>
<p>For more detailed information see <a href="../../bugs.html#1998_schnitzi">1998/schnitzi in bugs.html</a>.</p>
<h2 id="to-use">To use:</h2>
<pre><code> ./schnitzi n &gt; sort.c
make sort
./sort
# enter three numbers, space separated
echo x y z | ./sort</code></pre>
<p>where <code>n</code> and <code>x</code>, <code>y</code> and <code>z</code> are numbers.</p>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh</code></pre>
<p>What happens if at the command line you don’t specify <code>n</code> numbers that the
program expects? For instance try:</p>
<pre><code> ./schnitzi 5 &gt; sort.c
make sort
# try running the next command four or five times:
echo 2 5 3 1 | ./sort</code></pre>
<p>Why does this happen?</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>This is a beautiful program. How can a program with no conditional (except for
the fixes for modern systems) behavior at all have output which
depends on anything?</p>
<p>For hints on deciphering this, see below past the Author’s remarks;
they’re a nice summary, but they leave the mystery intact.</p>
<p>BTW: the author notes an incredible lipogram story called
<a href="https://www.gutenberg.org/cache/epub/47342/pg47342.txt">Gadsby</a> which has no
letter E in the story. He did not note this but it has over 50000 (50 thousand)
(!!) words without the letter E which is one of the most common letters!</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p>In literary circles, there is a poetic form called a “lipogram”,
which is a poem in which a specific letter has been distinctly
avoided. This principle can be applied in other ways. For
instance, in this paragraph, the vowel which immediately follows
<code>t</code> in the alphabet is nowhere to be seen. There is even an
entire novel (E. V. Wright’s “Gadsby”) in which no word contains
the letter <code>e</code>.</p>
<p>The IOCCC has been no stranger to this concept. Several winning entries from
years past have accomplished interesting feats while completely avoiding the use
of certain C constructs thought to be essential (e.g.,
<a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1988/robison/robison.c">1988/robison.c</a> file). If you have to ask why they would
do it this way, then this contest just isn’t for you.</p>
<p>In continuing with this fine tradition, this program suggests to the ANSI
committee some new practical simplifications for the C language. For instance,
it appears that CONDITIONAL BRANCHING isn’t really necessary. So, we can do
away with <code>while</code>, <code>do...while</code>, <code>for</code>, <code>if</code>/<code>else</code>, <code>switch</code>, <code>?:</code>, or anything
else that might cause any kind of non-deterministic jump in the code. There’s
too much uncertainty in the world anyway.</p>
<p>Function parameters and return types just confuse people anyway, so
get rid of them. Same with local variables. In fact, all you really
need are assignment statements, and maybe one <code>printf(3)</code> and one <code>goto</code>.</p>
<p>This style of programming is also ideal for systems with limited
memory capacity, since the function call stack never goes beyond
a depth of one.</p>
<p>So what does it do? Give it an integer <code>(1 &lt; n &lt; 27)</code> on the command
line, such as</p>
<pre><code> ./schnitzi 5</code></pre>
<p>The output will itself be a lipographic program, one which expects input of
(in this case) five numbers and prints them out sorted. It sorts
them, however, using only <code>if/else</code> statements, without arrays or
looping. To see the resulting program run, redirect the output from
<code>schnitzi</code> into another file, like this</p>
<pre><code> ./schnitzi 4 &gt; sort.c</code></pre>
<p>and then compile it.</p>
<h3 id="obfuscation-hints">Obfuscation hints:</h3>
<p>The big key to this program is figuring out what the names of the
functions ought to be; a bit of research may allow you to guess at
a few crucial ones.</p>
<p>The only function ever called is <code>O</code>, but <code>O</code> is just set to point to
other functions all the time. Or, almost all the time.</p>
<p>So how does <code>h</code> get set, and what to?</p>
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<div id="inventory">
<h1 id="inventory-for-1998schnitzi">Inventory for 1998/schnitzi</h1>
</div>
<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1998/schnitzi/schnitzi.c">schnitzi.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1998/schnitzi/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1998/schnitzi/schnitzi.orig.c">schnitzi.orig.c</a> - original source code</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1998/schnitzi/try.sh">try.sh</a> - script to try entry</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="1998_schnitzi.tar.bz2">1998_schnitzi.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1998/schnitzi/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/1998/schnitzi/.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/1998/schnitzi/.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/1998/schnitzi/.path">.path</a> - directory path from top level directory</li>
<li><a href="index.html">index.html</a> - this web page</li>
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