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Cody Boone Ferguson 22e483723c Make bug statuses in index.html files quotes
Instead of code blocks the bug / (mis)features statuses are quoted
rather than in a code block. In the case that there is more than one a
line break was added at the end of all but the last one.

A bug status was renamed to be slightly more correct (maybe more than
one was renamed for the same purpose but at least one was).

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2024-07-17 09:54:33 -07:00

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<h1>The International Obfuscated C Code Contest</h1>
<h2>2019/endoh - Most in need of debugging</h2>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/endoh/prog.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Yusuke_Endoh">Yusuke Endoh</a><br>
Location: <a href="../../location.html#JP">JP</a> - <em>Japan</em></li>
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<h2 id="to-build">To build:</h2>
<pre><code> make</code></pre>
<p>NOTE: the use of the C compiler optimiser was disabled and <code>-g</code> was enabled for
this entry because it is SUPPOSED to crash and it needs debugging symbols.</p>
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
<p>The current status of this entry is:</p>
<blockquote>
<p><strong>STATUS: INABIAF - please DO NOT fix</strong></p>
</blockquote>
<p>For more detailed information see <a href="../../bugs.html#2019_endoh">2019/endoh in bugs.html</a>.</p>
<h2 id="to-use">To use:</h2>
<pre><code> ./prog</code></pre>
<h2 id="try">Try:</h2>
<p>If you have <code>gdb(1)</code> installed:</p>
<pre><code> ./try.sh</code></pre>
<p>Note that in macOS installing <code>gdb(1)</code> takes multiple steps - it’s not just a
matter of installing <code>gdb(1)</code> and that’s that. The <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/endoh/try.sh">try.sh</a> script has
only been tested with linux.</p>
<p>You might also wish to try:</p>
<pre><code> gdb ./prog || lldb ./prog</code></pre>
<p>and then type in <code>r</code> (to run program) and then <code>bt</code> (for backtrace).</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>The purpose of this program is to crash. You’ll want to have memorized <code>man 7 ascii</code> when debugging it to reveal its purpose.</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<h3 id="backtrace-quine">backtrace quine:</h3>
<p>Compile prog.c with no optimization.</p>
<pre><code> cc -g -O0 -o prog prog.c</code></pre>
<p>Then, run it. You will see a segmentation fault.</p>
<pre><code> $ ./prog
Segmentation fault (core dumped)</code></pre>
<p>Let’s debug. As usual, run it under gdb.</p>
<pre><code> $ gdb ./prog
(gdb) run
Starting program: /home/.../prog
Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()</code></pre>
<p>Okay, check the backtrace.</p>
<pre><code> (gdb) backtrace
#0 0x0000000000000000 in ?? ()
#1 0x0000555555555201 in x23 () at prog.c:35
#2 0x000055555555571a in x64 () at prog.c:100
#3 0x0000555555555747 in x65 () at prog.c:101
#4 0x0000555555555774 in x66 () at prog.c:102
#5 0x00005555555557ce in x69 () at prog.c:105
#6 0x0000555555555828 in x6e () at prog.c:110
#7 0x0000555555555747 in x65 () at prog.c:101
...</code></pre>
<p>See the line numbers and lookup the ASCII table.</p>
<pre><code> 35 = &#39;#&#39;
100 = &#39;d&#39;
101 = &#39;e&#39;
102 = &#39;f&#39;
105 = &#39;i&#39;
110 = &#39;n&#39;
101 = &#39;e&#39;
...</code></pre>
<h3 id="one-more-thing">One more thing:</h3>
<p>The original program can be used as a GDB command file.</p>
<pre><code> gdb -q -x prog.c ./prog | cat
Reading symbols from ./prog...done.
Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
#0 0x0000000000000000 in ?? ()
#1 0x0000555555555201 in x23 () at prog.c:35
#2 0x000055555555571a in x64 () at prog.c:100
#3 0x0000555555555747 in x65 () at prog.c:101
#4 0x0000555555555774 in x66 () at prog.c:102
#5 0x00005555555557ce in x69 () at prog.c:105
#6 0x0000555555555828 in x6e () at prog.c:110
#7 0x0000555555555747 in x65 () at prog.c:101
...</code></pre>
<p>By using this, you can confirm that it is actually a quine.</p>
<pre><code> gdb -q -x prog.c ./prog | sed -n -r &#39;s/#.*:([0-9]+)/\1/p&#39; | awk &#39;{printf &quot;%c&quot;,$1}&#39; &gt; prog2.c
diff prog.c prog2.c</code></pre>
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<h2 id="primary-files">Primary files</h2>
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