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Add CC BY-SA 4.0 license images into the `png/` directory.
FYI: We use the license to allow the open use of IOCCC entry code,
and at the same time, we help ensure that those working on the IOCCC
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themselves! The _Copyright and CC BY-SA 4.0 License_ help ensure
that everyone may enjoy the IOCCC.
Added '#copyright' to all generated HTML pages so that the
_Copyright and CC BY-SA 4.0 License_ may be reached.
Changed `bin/gen-top-html.sh` VERSION from "1.2.2 2024-03-26"
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Fix `bin/gen-sitemap.sh` to remove requirement of `ioccc.tar.bz2`.
Changed `bin/gen-sitemap.sh` VERSION from "1.3.4 2024-03-27"
to "1.3.5 2024-04-13".
Perform `make www sitemap` to perform the above.
We also give a _hint_ as to the next project.
TODO: Complete that next project we are _hinting_ at.
TODO: Review the work being done by a web designer to see
how their work might be incorporated into the web site.
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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>1992/buzzard.2 - Best Language Tool</h2>
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<a class="Left" href="../buzzard.1/index.html">← buzzard.1</a>
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<a class="Left" href="../index.html">↑ 1992 ↑</a>
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<a class="Left" href="../gson/index.html">gson →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/1992/buzzard.2/buzzard.2.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/1992/buzzard.2/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
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<a href="../../index.html">IOCCC Home</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 class="sidenav">
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<a href="../../judges.html">The IOCCC Judges</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#Sean_Barrett">Sean Barrett</a><br>
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Location: <a href="../../location.html#ZZ">ZZ</a> - <em>Unknown location</em></li>
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<h2 id="to-build">To build:</h2>
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<pre class="<!---sh-->"><code> make all</code></pre>
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<p>There is an alternate version of this program. See <a href="#alternate-code">Alternate
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code</a> below for details.</p>
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<h2 id="to-use">To use:</h2>
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<p>First, you must make sure that <code>first</code> is made first (even though <code>make all</code>
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should make first first :-) ):</p>
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<pre class="<!---sh-->"><code> make first</code></pre>
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<p>Second:</p>
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<pre class="<!---sh-->"><code> # get help:
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echo help | cat third help.th - | ./first
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# try out a demo:
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cat third demo5.th | ./first</code></pre>
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<p>Third:</p>
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<pre class="<!---sh-->"><code> cat third help.th - | ./first</code></pre>
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<p>NOTE: Wait until ‘Ok’ is printed and the type:</p>
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<pre><code> 2 3 + . cr</code></pre>
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<p>Yes you should really type the 2 letters: <code>cr</code>.</p>
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<p>Fourth:</p>
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<pre><code> Sorry, this is third!</code></pre>
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<h2 id="try">Try:</h2>
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<pre class="<!---sh-->"><code> ./try.sh</code></pre>
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<h2 id="alternate-code">Alternate code:</h2>
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<p>This alternate version, <a href="buzzard.2.alt.c">buzzard.2.alt.c</a>, does not contain a
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fix that the author notes in their remarks.</p>
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<h3 id="alternate-build">Alternate build:</h3>
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<pre class="<!---sh-->"><code> make alt</code></pre>
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<h3 id="alternate-use">Alternate use:</h3>
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<p>Use <code>buzzard.2.alt</code> as you would <code>buzzard.2</code> above.</p>
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<h3 id="alternate-try">Alternate try:</h3>
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<pre class="<!---sh-->"><code> ./try.alt.sh</code></pre>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>Have fun!</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<h3 id="what-it-does">What it does</h3>
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<p><code>first</code> implements a relatively primitive stack machine. How
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primitive? It supplies 13 visible primitives: 3 arithmetic,
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1 comparison, 2 memory-access, 2 character I/O, 3 primitives
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for defining new words, 1 tokenizing, and 1 special stack
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operation. (There are also three internal operations for
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the stack machine: ‘push this integer’, ‘call this code’,
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and ‘compile a call to this code’.)</p>
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<p>It is very difficult to accomplish anything with this set
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of primitives, but they do have an interesting property.</p>
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<p>This–what this interesting property is, or in other words
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what first is good for–is the major obfuscation; there are
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also minor source obfuscations, as well as some design tricks
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that are effectively obfuscations. Details on the obfuscations
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are below, and the interesting property is discussed much
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further down.</p>
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<h3 id="how-to-run-it">How to run it</h3>
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<p><code>first</code> expects you to first enter the names of the 13 primitives,
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separated by whitespace–it doesn’t care what you name them, but
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if all the names aren’t unique, you won’t be able to use some of
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them. After this you may type any sequence of valid <code>first</code> input.
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Valid <code>first</code> input is defined as any sequence of whitespace-delimited
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tokens which consist of primitives, new words you’ve defined, and
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integers (as parsed by <code>"%d"</code>). Invalid input behaves unpredictably,
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but gives no warning messages. A sample program, <code>demo1.1st</code>, is
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included, but it only works on ASCII systems.</p>
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<p>Do not expect to be able to do anything interesting with <code>first</code>.</p>
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<p>To do something interesting, you need to feed <code>first</code> the file
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<a href="third">third</a> first. In unix, you can do</p>
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<pre class="<!---sh-->"><code> cat third help.th - | ./first</code></pre>
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<p>to do this. Hopefully most operating systems will provide a way to do this. It
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may take some time for this to complete (I seem to remember it taking several
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minutes on an 8086 PC); <code>THIRD</code> will prompt you when it is finished. The file
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<a href="third">third</a> has not been obfuscated, due to sheer kindness on the author’s
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part.</p>
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<p>For more information on what you can do once you’ve piped <a href="third">third</a> into
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first, type <code>help</code> and consult
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<a href="https://en.wikipedia.org/wiki/Forth_(programming_language)">FORTH</a> manuals for
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further reference. Six sample THIRD programs are included in the files
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<code>demo1.th</code> through <code>demo6.th</code>. See <a href="buzzard.2.README.html">buzzard.2.README.html</a>
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for more information.</p>
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<p>Keep in mind that you are still running <code>first</code>, and are for the most part
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limited by <code>first</code>’s tokenizer (notably, unknown words will attempt to be parsed
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as integers.) It is possible to build a new parser that parses by hand, reading
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a single character at a time; however, such a parser cannot easily use the
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existing dictionary, and so would have to implement its own, thus requiring
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reimplementing all of <code>first</code> and <code>third</code> a second time–I did not care to
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tackle this project.</p>
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<h3 id="compiling">Compiling</h3>
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<p><code>first</code> is reasonably portable. You may need to adjust the size of the buffers
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on smaller machines; <code>m[]</code> needs to be at least 2000 long, though.</p>
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<p>I say <code>first</code> is portable mainly because it uses native types. Unlike
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[FORTH](https://en.wikipedia.org/wiki/Forth_(programming_language), which
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traditionally allows byte and multi-byte operations, all operations are
|
||
performed on C <code>int</code>s. That means <code>first</code> code is only as portable as the same
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code would be in C. As in C, the result of dividing <code>-1</code> by <code>2</code> is machine (or
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rather compiler) dependent.</p>
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<h3 id="how-is-first-obfuscated">How is first obfuscated?</h3>
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<p><code>first</code> is obfuscated in several ways. Some minor obfuscations like
|
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<code>&w[&m[1]][s]</code> for <code>s+m[w+1]</code> were in the original source but are no longer
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because, apparently, ANSI doesn’t allow it (<code>gcc -ansi -pedantic</code> doesn’t mind
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||
it, though.)</p>
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||
<p>Other related obfuscations are still present. The top of the stack is cached in
|
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a variable, which increases performance massively if the compiler can figure out
|
||
to keep it in a register; it also obfuscates the code. (Unfortunately, the top
|
||
of stack is a global variable and neither gcc nor most bundled compilers seem to
|
||
<code>register</code> allocate it.)</p>
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||
<p>More significant are the design obfuscations. <code>m[0]</code> is the “dictionary
|
||
pointer”, used when compiling words, and <code>m[1]</code> is the return stack index. Both
|
||
are used as integer offsets into <code>m</code>. Both are kept in <code>m</code>, instead of as
|
||
separate pointers, because they are then accessible to <code>first</code> programs, which
|
||
is a crucial property of <code>first</code>. Similarly the way words are stored in the
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||
dictionary is not obvious, so it can be difficult to follow exactly what the
|
||
compiler words are doing.</p>
|
||
<p>Assuming you’ve waded through all that, you still have to penetrate the most
|
||
significant obfuscation. Traditionally, the question is whether a reader can
|
||
answer the question “what will this do when I run it”. A reader who has
|
||
deciphered <code>first</code> to this point may think they know the answer to this
|
||
question, but they may not know the answer to the more important question, “what
|
||
will this program do when given the right input?”
|
||
<a href="https://en.wikipedia.org/wiki/Forth_(programming_language)">FORTH</a> aficionados,
|
||
and especially FORTH implementers, may recognize the similarity of the internal
|
||
compiler format to many FORTH internal representations, and, being aware that
|
||
FORTH interpreters can often be self-compiling, may be suspicious that this
|
||
program can compile FORTH, or a significant subset of it, or at least be capable
|
||
of doing so if fed the right input. Of course, the name “THIRD” should be a
|
||
dead giveaway, if the name “first” wasn’t. (These numbers were largely chosen
|
||
because they were five letters long, like “FORTH”, and would not require
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||
truncation to five letters, which would be a dead giveaway. Besides, THIRD
|
||
represents a step backwards, in more ways than one.)</p>
|
||
<h3 id="what-exactly-is-first-then">What exactly is <code>first</code>, then?</h3>
|
||
<p><code>first</code> is a tiny interpreter which implements a sufficient pseudo-subset of
|
||
<a href="https://en.wikipedia.org/wiki/Forth_(programming_language)">FORTH</a> to allow it
|
||
to bootstrap a relatively complete version of FORTH (based loosely on forth79),
|
||
which I call THIRD. Complete relative to what, I’m not sure.</p>
|
||
<p>I believe <code>first</code> is close to the smallest amount of code possible to get this
|
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effect <em>using forth-style primitives</em>, and still have some efficiency (it is
|
||
possible to get by without multiplication if you have addition, obviously). In
|
||
the design file, design, I give a justification for why each primitive in
|
||
<code>first</code> was included.</p>
|
||
<p>THIRD is sorta slow, because <code>first</code> has so few primitives that many things that
|
||
are primitives in
|
||
<a href="https://en.wikipedia.org/wiki/Forth_(programming_language)">FORTH</a> (like swap)
|
||
take a significant amount of time in THIRD.</p>
|
||
<p>When you get the <code>Ok.</code> message from <code>third</code>, try out some sample
|
||
<a href="https://en.wikipedia.org/wiki/Forth_(programming_language)">FORTH</a> code
|
||
(<code>first</code> has no way of knowing if keyboard input is waiting, so it can’t actually prompt
|
||
you in a normal way. It only prints <code>'Ok.'</code> after you define a word).</p>
|
||
<pre class="<!---sh-->"><code> 2 3 + . cr</code></pre>
|
||
<p>(which adds 2 and 3, and print the result and a newline.)</p>
|
||
<p>THIRD responds:</p>
|
||
<pre><code> 5</code></pre>
|
||
<p>Now try:</p>
|
||
<pre><code> : test 11 1 do i . loop cr ;
|
||
test</code></pre>
|
||
<p>and THIRD responds</p>
|
||
<pre><code> 1 2 3 4 5 6 7 8 9 10</code></pre>
|
||
<p>When in <code>THIRD</code>, you can see how much space you’re currently
|
||
using by typing:</p>
|
||
<pre><code> here .</code></pre>
|
||
<p>The number THIRD replies with is the number of machine words (<code>int</code>s) that the
|
||
dictionary (the first code) takes up, plus the 512 <code>int</code>s for the return stack.
|
||
If you compile the basic THIRD system without the help word (strings take up one
|
||
<code>int</code> per character in the string!), you should find that you’re using around
|
||
1000 <code>int</code>s (plus the return stack).</p>
|
||
<p>Thus THIRD gives you a relatively complete
|
||
<a href="https://en.wikipedia.org/wiki/Forth_(programming_language)">FORTH</a> system in
|
||
less than 700 chars of C source + about 1000 <code>int</code>s of memory–and it’s portable
|
||
too (you could copy over the THIRD memory dump to another machine, in theory).
|
||
If the above numbers seem to you to be mixing apples and oranges (C source and
|
||
compiled THIRD code), note that you should in theory be able to stick the
|
||
compiled THIRD code into the C source.</p>
|
||
<p>Software Construction Company gets credit for rekindling my interest in FORTH
|
||
and thus indirectly inspiring me to write this program.</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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<h1 id="inventory-for-1992buzzard.2"><a name="inventory"></a>Inventory for 1992/buzzard.2</h1>
|
||
<p><a href="#top">Jump to top</a></p>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/buzzard.2.c">buzzard.2.c</a> - entry source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/buzzard.2.alt.c">buzzard.2.alt.c</a> - alternative source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/buzzard.2.orig.c">buzzard.2.orig.c</a> - original source</li>
|
||
<li><a href="buzzard.2.README.html">buzzard.2.README.html</a> - author description of files</li>
|
||
<li><a href="buzzard.2.design.html">buzzard.2.design.html</a> - about the FORTH language</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/try.alt.sh">try.alt.sh</a> - how to run alternative code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/try.sh">try.sh</a> - how to run</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/demo1.1st">demo1.1st</a> - FORTH source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/demo1.th">demo1.th</a> - FORTH source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/demo2.th">demo2.th</a> - FORTH source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/demo3.th">demo3.th</a> - FORTH source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/demo4.th">demo4.th</a> - FORTH source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/demo5.th">demo5.th</a> - FORTH source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/demo6.th">demo6.th</a> - FORTH source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/help.th">help.th</a> - FORTH source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/third">third</a> - the third source</li>
|
||
<li><a href="1992_buzzard.2.tar.bz2">1992_buzzard.2.tar.bz2</a> - download entry</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="index.html">index.html</a> - this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/README.md">README.md</a> - markdown source for index.html</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/buzzard.2.README.md">buzzard.2.README.md</a> - markdown source for buzzard.2.README.html</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/buzzard.2.design.md">buzzard.2.design.md</a> - markdown source for buzzard.2.design.html</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/.entry.json">.entry.json</a> - description of entry in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/buzzard.2/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
|
||
<li><a href=".path">.path</a> - directory path from top directory</li>
|
||
</ul>
|
||
|
||
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<h2><a name="copyright"></a>Copyright and CC BY-SA 4.0 License</h2>
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<p>All IOCCC content including this file and web page are:</p>
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|
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<h2>Coda</h2>
|
||
<p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1992%2Fbuzzard.2%2Findex.html">Nu HTML check this web page</a></p>
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