Landon Curt Noll
4ee4c731f7
While not strictly necessary, replacing the two ASCII tab characters in the markdown copyright comment makes it easier to detect problematic TAB indentation within markdown files. After this commit, only 90 markdown files have leading ASCII TAB characters. And again, while not strictly necessary, we can consider running expand on those 90 markdown files to see what effect that might have on the HTML files they produce. Replace leading ASCII TAB characters with multiples of 8 ASCII SPACE characters (the default action of the `expand(1)` tool) might have an negative effect on some HTML formatting where **hack-a-round** formatting was attempted to fix broken indentation caused by problematic ASCII TAB characters. Think of this as a baseline for evaluating leading TAB characters within markdown files. TODO: Consider either using `expand(1)` to replace leading ASCII TAB characters with multiples of 8 ASCII SPACE characters AND/OR modifying the appropriate `bin` tool to convert leading ASCII TAB characters into multiples of 8 ASCII SPACE characters.
521 lines
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<h1>The International Obfuscated C Code Contest</h1>
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<h2>macos.html for 1998/schweikh1</h2>
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<!-- BEFORE: 1st line of markdown file: 1998/schweikh1/macos.md -->
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<p>This document describes how this was fixed to work with macOS as well as some of
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the magic in the entry. Even if you don’t have a Mac it might be worth your time
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reading especially as some of it details some important fixes and changes in the
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original entry as well.</p>
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<h1 id="macos-changes">macOS changes</h1>
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<p>As an aside: if you have a Mac with the Apple chip, some of the header files
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will report an unsupported architecture and unsupported compiler (error,
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warning). This will not make the program abort, however, but even with an Intel
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CPU though, the original entry will not work in macOS as it stands because
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<code>/usr/include</code> is hard-coded in the code and macOS does not have it.</p>
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<p>Nevertheless, although some of it would not work in other systems where
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<code>/usr/include</code> exists, the <code>#define</code>s would still be found okay, at least until
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a file was not found (this limitation was removed in both versions in 2023). see</p>
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<p>However, as noted, macOS does <strong>not</strong> have <code>/usr/include</code> so this would never
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work for macOS without some changes, described next. For macOS you will need the
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command line tools installed which can be done like:</p>
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<pre><code> sudo xcode-select --install</code></pre>
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<p>An important point is that the original version hard-coded <code>gcc</code> but just like
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the entry, the alternate version has also removed this limitation despite <code>gcc</code>
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existing (though it’s <code>clang</code>) in macOS.</p>
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<p>Now as far as how this works if you look at the code of
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<a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1998/schweikh1/schweikh1.c">schweikh1.c</a>, on line 55 you’ll see a funny command (this goes for
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the alternate version as well but a bit different).</p>
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<p>Now the key is two magic numbers, one (two times) on a different line shortly below the
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string and the other a couple lines further below.</p>
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<p>In the original the numbers are, respectively, <code>44</code> and <code>46</code>, but with the gcc
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limitation removed the numbers now are <code>43</code> and <code>45</code>. But how does this work? Well
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the command is:</p>
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<pre><code> "0gcc -ansi -E -dM -undef %s /usr/include/%s>r\0 ("</code></pre>
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<p>which has been changed to be:</p>
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<pre><code> "0cc -ansi -E -dM -undef %s /usr/include/%s>r\0 ("</code></pre>
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<p>Shortly below that you will see, as noted above, the numbers:</p>
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<pre><code> if ((H = fopen (__FILE__+43, 43+__FILE__)))
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while ((fgets (L, (int)sizeof L, H)) != 0) {
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I[strcspn (I, 45+__FILE__)] = O = 0;</code></pre>
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<p>The first number in the above C means the length starting from 0 up through the
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<code>></code>. The second number is the same starting point but up through the <code>\0</code> which
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is why it’s <code>+2</code>. But what happens if only the first number is updated (from the
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original)? Most of the output will be just <code>#define</code> by itself; in the cases
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where there was text after that it was macros that certainly were not defined.
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There might have been other errors as well.</p>
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<p>Changing this for macOS allows for opening the right files; the problem with
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macOS is <code>/usr/include</code> does not exist: instead it’s
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<code>/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include</code> which is why
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the different command line and the different numbers. The change of the numbers
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can be found in the alternate code and the explanation is the same.</p>
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<hr style="width:10%;text-align:left;margin-left:0">
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<p>Jump to: <a href="#">top</a></p>
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Copyright © 1984-2024 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:
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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Copyright © 1984-2024 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:
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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For more information, see:
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<div id="copyright"><h3>Copyright © 1984-2024 by Landon Curt Noll:
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rel="license noopener noreferrer">Some Rights Reserved</a></h3>
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<p>
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This work is <b>licensed by Landon Curt Noll</b> under
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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>
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before using the licensed material.<br>
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You may wish to review the
|
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<b><a href="../../license.html"
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target="_blank"
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rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
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of <b>CC BY-SA 4.0</b>.<br>
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</p>
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</div>
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||
<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%2F1998%2Fschweikh1%2Fmacos.html" rel="nofollow">Nu HTML check this web page</a><br>
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<a href="#top">Jump to top</a> <a href="#content">Jump to Content</a>
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