That is to say in the bugs file it will look something like: STATUS: INABIAF - please DO NOT fix but as a html file it is already bold as a heading. This means there is no need in the index.html file to have the explicit **DO NOT** as it's in a code block and it is not consistent in what is in bugs.html. For instance 1984/mullender had: STATUS: INABIAF - please **DO NOT** fix but this meant the index.html file had the '**'s surrounding the DO NOT which is not consistent with bugs.html.
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<h1>The International Obfuscated C Code Contest</h1>
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<h2>1990/tbr - Best utility</h2>
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<a class="Left" href="../stig/index.html">← stig</a>
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<a class="Left" href="../theorem/index.html">theorem →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/tbr/tbr.c">C code</a>
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<div id="author">
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<h2 id="authors">Authors:</h2>
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</div>
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<ul>
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<li>Name: <a href="../../authors.html#Byron_Rakitzis">Byron Rakitzis</a><br>
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Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)
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<br><br></li>
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<li>Name: <a href="../../authors.html#Sean_Dorward">Sean Dorward</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: 1990/tbr/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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<p>The authors provided another version of this program. See the <a href="#alternate-code">alternate
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version</a> section below.</p>
|
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<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
|
||
<p>The current status of this entry is:</p>
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||
<pre><code> STATUS: INABIAF - please DO NOT fix</code></pre>
|
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<p>For more detailed information see <a href="../../bugs.html#1990_tbr">1990/tbr in bugs.html</a>.</p>
|
||
<h3 id="a-note-about-the-fixes-of-this-entry-in-2023">A note about the fixes of this entry in 2023:</h3>
|
||
<p>In 2023 it was noticed that in some systems like macOS there was confusing
|
||
output due to a warning at runtime that was interspersed with the output of the
|
||
program. For instance it would show:</p>
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<pre><code> ./tbr
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$ warning: this program uses gets(), which is unsafe.</code></pre>
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<p>which kind of hid the prompt. Thus the entry was changed to use <code>fgets(3)</code> which
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is referred to later in this file.</p>
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||
<p>Also <code>exit(3)</code> returns <code>void</code> but the entry was using it in a binary expression so
|
||
this entry would not compile in modern systems. This fix is also referred to
|
||
below, in the <a href="#alternate-code">alternate version</a> section.</p>
|
||
<h2 id="to-use">To use:</h2>
|
||
<pre><code> ./tbr
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$ enter some shell commands</code></pre>
|
||
<p>NOTE: globs do not work with this entry. Why?</p>
|
||
<p>NOTE: <code>exit</code> does not work and neither does <code>logout</code>. To exit try sending ctrl-d
|
||
or ctrl-c (or kill it from another terminal :-) ). But why does it not work with
|
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just <code>exit</code> or <code>logout</code>? Hint: see the authors’ remarks.</p>
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<h2 id="try">Try:</h2>
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||
<pre><code> ./tbr
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$ ls -l tbr tbr.c
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||
# notice how the following does not work:
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ls tbr*
|
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||
# try figuring out how this entry works in an editor:
|
||
vi tbr.c
|
||
|
||
# then figure out how to exit vi :-)</code></pre>
|
||
<p>What happens if you try using <code>cd -</code> to return to previous directory? What about
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||
<code>cd</code> with no args?</p>
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||
<p>The authors include a section called <a href="#bugs">BUGS</a> that, because they were
|
||
documented, are not considered bugs as such in the context of the contest.</p>
|
||
<h2 id="alternate-code">Alternate code:</h2>
|
||
<p>The authors supplied us with a slightly smaller unformatted version
|
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of the program:</p>
|
||
<pre><code> #define D ,close(
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char*c,q[512],m[256],*v[99],**u,*i[3];int f[2],p;main(){for(m[m[60]=m[62]=
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32]=m[*m=124[m]=9]=6;e(-8),gets(1+(c=q))||(exit(0),0);r(0,0))for(;*++c;);}
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r(t,o){*i=i[2]=0;for(u=v+98;m[*--c]^9;m[*c]&32?i[*c&2]=
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*u,u-v^98&&++u:3)if(!m[*c]){for(*++c=0;!m[*--c];);*--u=
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++c;}u-v^98?strcmp(*u,"cd")?*c?pipe(f),o=f[1]:1,(p=fork())?e(p),o?
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r(o,0)D o)D*f):4,wait(0):(o?dup2(*f,0)D*f)D o):*i?1 D
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0),e(open(*i,0)):5,t?dup2(t,1)D t):i[2]?9 D
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1),e(creat(i[2],438)):2,e(execvp(*u,u))):e(chdir(u[1])*2):6;}
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e(x){x<0?write(2,"?\n$ "-x/4,2),x+1||(exit(1),0):5;}</code></pre>
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<p>This is the <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/tbr/tbr.alt.c">alternate source</a> except that it
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has the <code>exit()</code> returns <code>void</code> fix as well as the <code>gets(3)</code> to <code>fgets(3)</code> fix
|
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applied to it to make it functionally equivalent like the authors intended. The
|
||
above code is their original alternate code.</p>
|
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<h3 id="alternate-build">Alternate build:</h3>
|
||
<pre><code> make alt</code></pre>
|
||
<h3 id="alternate-use">Alternate use:</h3>
|
||
<pre><code> ./tbr.alt</code></pre>
|
||
<h2 id="judges-remarks">Judges’ remarks:</h2>
|
||
<p>This program touches on a well known Unix utility, the 6th edition Bourne Shell
|
||
(<code>/bin/sh</code>), whose original source was considered to be extremely obfuscated by
|
||
many people (although Steve Bourne might disagree). Did you know that the Bourne
|
||
Shell source was a major inspiration for the formation of the IOCCC back in
|
||
1984?</p>
|
||
<h2 id="authors-remarks">Authors’ remarks:</h2>
|
||
<p>This program is a rudimentary shell. It does I/O redirection, pipes
|
||
and cd. It flags errors on failed <code>chdir()</code>, <code>open()</code>, <code>creat()</code>,
|
||
<code>execvp()</code>, <code>fork()</code> and a few syntax errors.</p>
|
||
<p>This program is obfuscated in a few notable ways: apart from the layout (an
|
||
unformatted (but crunched) version is included for people who want to put this
|
||
through <code>cb</code>) it makes clever use of a <code>write()</code> statement, so that the same statement
|
||
can be used to print errors and the prompt. By calling the error function with
|
||
the value <code>-8</code>, the pointer offset in the expression <code>"?\n$ "-x/4</code> goes from 0
|
||
to 2. Presto! A prompt. For errors with numbers smaller than <code>-4</code> (i.e., UNIX
|
||
system calls) a question mark is printed.</p>
|
||
<p>The error value of <code>chdir()</code> is doubled so that we don’t exit from the parent
|
||
shell on a <code>chdir()</code> error (since <code>e()</code> exits on <code>-1</code> errors only). All other
|
||
system call failures exit since they are from sub-shells.</p>
|
||
<p>Recursion is sneakily employed to avoid a second call to <code>fork()</code>,
|
||
and the line is parsed in a fairly bizarre fashion: backwards. The
|
||
heart of the program, that is, the part which performs all <code>fork()</code>s,
|
||
<code>exec()</code>s, <code>open()</code>s, etc. is ONE C STATEMENT.</p>
|
||
<p>The meta-values array is initialized in a bizarre fashion, and the
|
||
subsequent checks for the <code>'<'</code> and <code>'>'</code> are performed in a single
|
||
statement using a mask, since you know that <code>'>'&2</code> is 0, whereas
|
||
<code>'<'&2</code> is 2. Other such micro-obfuscations abound.</p>
|
||
<p>Finally, it is notable that the code was hacked for minimality. If
|
||
you look at the compressed version, you will be hard-pressed to
|
||
eliminate more than a few characters (we can’t see how to make it
|
||
any smaller!). 550 characters is pretty lean for a shell that does
|
||
this much.</p>
|
||
<h3 id="bugs">BUGS</h3>
|
||
<p>The syntax of the shell has not been fully explored, but if you try
|
||
to redirect in the same direction more than once, only one
|
||
redirection is performed. This is a “feature” of the way the line
|
||
is parsed; a pointer to the stack of arguments is assigned and an
|
||
argument is stolen every time a <code>></code> or <code><</code> is encountered. The
|
||
shell flags an error if no arguments are on the stack. Thus, for
|
||
example:</p>
|
||
<pre><code> cat > foo > bar</code></pre>
|
||
<p>cats to <code>foo</code>, since it was pushed last, but</p>
|
||
<pre><code> cat > > foo bar</code></pre>
|
||
<p>cats to <code>bar</code>, since <code>bar</code> was pushed under <code>foo</code> (remember we’re
|
||
parsing right-left).</p>
|
||
<p>Depending on your flavor of Unix, <code>cd</code> without an argument will
|
||
either produce an error or just do nothing.</p>
|
||
<p>There is just one error message, the question mark, but hey, that’s
|
||
all <code>ed(1)</code> does too.</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/
|
||
|
||
-->
|
||
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|
||
|
||
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||
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|
||
|
||
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|
||
|
||
<div id="inventory">
|
||
<h1 id="inventory-for-1990tbr">Inventory for 1990/tbr</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/tbr/tbr.c">tbr.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/tbr/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/tbr/tbr.alt.c">tbr.alt.c</a> - alternate source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/tbr/tbr.orig.c">tbr.orig.c</a> - original source code</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="1990_tbr.tar.bz2">1990_tbr.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/tbr/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/1990/tbr/.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/1990/tbr/.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/1990/tbr/.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 -->
|
||
|
||
<!--
|
||
|
||
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/
|
||
|
||
-->
|
||
|
||
<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%2F1990%2Ftbr%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>
|
||
</p>
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</div>
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</div>
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</body>
|
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|
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