Landon Curt Noll
0833c3e4f0
We set LC_ALL=C when sorting in a bin tool. This was done to make the result of using `sort(1)` consistent. Improved how the Primary files and Secondary files are sorted by `bin/output-index-inventory.sh` to sort with "-u -k 1n -k 3.2d". The above will change `index.html` files for all entries. Changed `bin/chk-entry.sh` VERSION from "1.1.2 2024-03-17" to "1.1.3 2024-03-18". Changed `bin/gen-authors.sh` VERSION from "1.3 2024-03-04" to "1.3.1 2024-03-18". Changed `bin/gen-location.sh` VERSION from "1.1 2024-03-04" to "1.1.1 2024-03-18". Changed `bin/gen-sitemap.sh` VERSION from "1.3 2024-03-16" to "1.3.1 2024-03-18". Changed `bin/output-index-inventory.sh` VERSION from "1.2 2024-02-27" to "1.2.1 2024-03-18". Changed `bin/pandoc-wrapper.sh` VERSION from "1.5 2024-03-18" to "1.5.1 2024-03-18". Changed `bin/sort.gitignore.sh` VERSION from "1.1.1 2024-02-23" to "1.1.2 2024-03-18". Changed `bin/tar-all.sh` VERSION from "1.1 2024-02-27" to "1.1.1 2024-03-18". Changed `bin/tar-year.sh` VERSION from "1.1 2024-02-27" to "1.1.1 2024-03-18". Performed `make www` to update all entry `index.html` files.
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>2019/endoh - Most in need of debugging</title>
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<meta name="description" content="2019 IOCCC entry endoh - Most in need of debugging">
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<meta name="keywords" content="IOCCC, 2019, IOCCC 2019, IOCCC entry, endoh, Most in need of debugging">
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<div class="header">
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<img src="../../png/ioccc.png" alt="IOCCC image by Matt Zucker" width=300 height=110>
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<h1>The International Obfuscated C Code Contest</h1>
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<h2>2019/endoh - Most in need of debugging</h2>
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<a class="Left" href="../duble/index.html">← duble</a>
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<a class="Left" href="../index.html">↑ 2019 ↑</a>
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<a class="Left" href="../giles/index.html">giles →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/2019/endoh/prog.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/2019/endoh/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
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<div class="sidenav">
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<a href="../../index.html">IOCCC Home</a>
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<a href="../../years.html">Winning Entries</a>
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<a href="../../authors.html">People who have won</a>
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<a href="../../location.html">Location of authors</a>
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<a href="../../news.html">IOCCC News</a>
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<a href="../../faq.html#submit">How to enter the IOCCC</a>
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<a href="../../faq.html">FAQ</a>
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<div class="sidenav">
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<a href="../../bugs.html">Bugs & (mis)features</a>
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<a href="../../faq.html#fix_an_entry">Fixing IOCCC entries</a>
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<a href="../../faq.html#fix_web_site">Fixing the web site</a>
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<a href="../../faq.html#fix_author">Fixing author info</a>
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<a href="../../thanks-for-help.html">Thanks for the help</a>
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</div>
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<hr>
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<div class="sidenav">
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<a href="../../judges.html">The IOCCC Judges</a>
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<a href="../../contact.html">Contacting the IOCCC</a>
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<h2 id="author"><a name="author"></a>Author:</h2>
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<ul>
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<li>Name: <a href="../../authors.html#Yusuke_Endoh">Yusuke Endoh</a><br>
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Location: <a href="../../location.html#JP">JP</a> - <em>Japan</em>
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<br><br></li>
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<h2 id="to-build">To build:</h2>
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<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span></span></code></pre></div>
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<p>NOTE: the use of the C compiler optimiser was disabled and <code>-g</code> was enabled for
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this entry because it is SUPPOSED to crash and it needs debugging symbols.</p>
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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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<pre><code>STATUS: INABIAF - please **DO NOT** fix</code></pre>
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<p>For more detailed information see <a href="../../bugs.html#2019_endoh">2019 endoh bugs</a>.</p>
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<h2 id="to-use">To use:</h2>
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<div class="sourceCode" id="cb3"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./prog</span></span></code></pre></div>
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<h2 id="try">Try:</h2>
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<p>If you have <code>gdb(1)</code> installed:</p>
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<div class="sourceCode" id="cb4"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.sh</span></span></code></pre></div>
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<p>Note that in macOS installing <code>gdb(1)</code> takes multiple steps - it’s not just a
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matter of installing <code>gdb(1)</code> and that’s that. The <a href="try.sh">try.sh</a> script has
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only been tested with linux.</p>
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<p>You might also wish to try:</p>
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<div class="sourceCode" id="cb5"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="fu">gdb</span> ./prog <span class="kw">||</span> <span class="ex">lldb</span> ./prog</span></code></pre></div>
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<p>and then type in <code>r</code> (to run program) and then <code>bt</code> (for backtrace).</p>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<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>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<h3 id="backtrace-quine">backtrace quine:</h3>
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<p>Compile prog.c with no optimization.</p>
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<div class="sourceCode" id="cb6"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="fu">cc</span> <span class="at">-g</span> <span class="at">-O0</span> <span class="at">-o</span> prog prog.c</span></code></pre></div>
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<p>Then, run it. You will see a segmentation fault.</p>
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<div class="sourceCode" id="cb7"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> ./prog</span>
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<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a><span class="ex">Segmentation</span> fault <span class="er">(</span><span class="ex">core</span> dumped<span class="kw">)</span></span></code></pre></div>
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<p>Let’s debug. As usual, run it under gdb.</p>
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<div class="sourceCode" id="cb8"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> gdb ./prog</span>
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<span id="cb8-2"><a href="#cb8-2" aria-hidden="true" tabindex="-1"></a><span class="kw">(</span><span class="fu">gdb</span><span class="kw">)</span> <span class="ex">run</span></span>
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<span id="cb8-3"><a href="#cb8-3" aria-hidden="true" tabindex="-1"></a><span class="ex">Starting</span> program: /home/.../prog</span>
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<span id="cb8-4"><a href="#cb8-4" aria-hidden="true" tabindex="-1"></a></span>
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<span id="cb8-5"><a href="#cb8-5" aria-hidden="true" tabindex="-1"></a><span class="ex">Program</span> received signal SIGSEGV, Segmentation fault.</span>
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<span id="cb8-6"><a href="#cb8-6" aria-hidden="true" tabindex="-1"></a><span class="ex">0x0000000000000000</span> in <span class="pp">??</span> <span class="er">(</span><span class="kw">)</span></span></code></pre></div>
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<p>Okay, check the backtrace.</p>
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<pre><code>(gdb) backtrace
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#0 0x0000000000000000 in ?? ()
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#1 0x0000555555555201 in x23 () at prog.c:35
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#2 0x000055555555571a in x64 () at prog.c:100
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#3 0x0000555555555747 in x65 () at prog.c:101
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#4 0x0000555555555774 in x66 () at prog.c:102
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#5 0x00005555555557ce in x69 () at prog.c:105
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#6 0x0000555555555828 in x6e () at prog.c:110
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#7 0x0000555555555747 in x65 () at prog.c:101
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...</code></pre>
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<p>See the line numbers and lookup the ASCII table.</p>
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<pre><code> 35 = '#'
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100 = 'd'
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101 = 'e'
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102 = 'f'
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105 = 'i'
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110 = 'n'
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101 = 'e'
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...</code></pre>
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<h3 id="one-more-thing">One more thing:</h3>
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<p>The original program can be used as a GDB command file.</p>
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<pre><code>gdb -q -x prog.c ./prog | cat
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Reading symbols from ./prog...done.
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Program received signal SIGSEGV, Segmentation fault.
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0x0000000000000000 in ?? ()
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#0 0x0000000000000000 in ?? ()
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#1 0x0000555555555201 in x23 () at prog.c:35
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#2 0x000055555555571a in x64 () at prog.c:100
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#3 0x0000555555555747 in x65 () at prog.c:101
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#4 0x0000555555555774 in x66 () at prog.c:102
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#5 0x00005555555557ce in x69 () at prog.c:105
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#6 0x0000555555555828 in x6e () at prog.c:110
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#7 0x0000555555555747 in x65 () at prog.c:101
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...</code></pre>
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<p>By using this, you can confirm that it is actually a quine.</p>
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<div class="sourceCode" id="cb12"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb12-1"><a href="#cb12-1" aria-hidden="true" tabindex="-1"></a><span class="fu">gdb</span> <span class="at">-q</span> <span class="at">-x</span> prog.c ./prog <span class="kw">|</span> <span class="fu">sed</span> <span class="at">-n</span> <span class="at">-r</span> <span class="st">'s/#.*:([0-9]+)/\1/p'</span> <span class="kw">|</span> <span class="fu">awk</span> <span class="st">'{printf "%c",$1}'</span> <span class="op">></span> prog2.c</span>
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<span id="cb12-2"><a href="#cb12-2" aria-hidden="true" tabindex="-1"></a><span class="fu">diff</span> prog.c prog2.c</span></code></pre></div>
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<h2 id="copyright-and-cc-by-sa-4.0-license">Copyright and CC BY-SA 4.0 License:</h2>
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<p>This file is Copyright (c) 2023 by Landon Curt Noll. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:</p>
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<pre><code>Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)</code></pre>
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<p>For more information, see: https://creativecommons.org/licenses/by-sa/4.0/</p>
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<h1 id="inventory-for-2019endoh"><a name="inventory"></a>Inventory for 2019/endoh</h1>
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<p><a href="#top">Jump to top</a></p>
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<h2 id="primary-files">Primary files</h2>
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<ul>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/endoh/prog.c">prog.c</a> - entry source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/endoh/Makefile">Makefile</a> - entry Makefile</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/endoh/prog.orig.c">prog.orig.c</a> - original source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/endoh/try.sh">try.sh</a> - how to run</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/endoh/ascii.c">ascii.c</a> - shows character value of ASCII</li>
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<li><a href="2019_endoh.tar.bz2">2019_endoh.tar.bz2</a> - download entry source</li>
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</ul>
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<h2 id="secondary-files">Secondary files</h2>
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<ul>
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<li><a href="index.html">index.html</a> - entry home page</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/endoh/README.md">README.md</a> - markdown source for index.html</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/endoh/.entry.json">.entry.json</a> - description of entry in JSON</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/endoh/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
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<li><a href=".path">.path</a> - directory path from top directory</li>
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</ul>
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<div class="footer">
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<hr>
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<h2>Coda</h2>
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<p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2019%2Fendoh%2Findex.html">Nu HTML check this web page</a></p>
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<p><a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a></p>
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