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Landon Curt Noll 11dfe51c6c move IOCCC Quick Start Guide
Created `quick-start.md` to hold the FAQ 0.0 content.

Used `sgit(1)` to change:

* faq.html#enter ==> quick-start.html#enter
* faq.html#enter_questions ==> quick-start.html#enter_questions
* faq.html#step_0 ==> quick-start.html#step_0
* faq.html#step_1 ==> quick-start.html#step_1
* faq.html#step_2 ==> quick-start.html#step_2
* faq.html#register ==> quick-start.html#register
* faq.html#step_3 ==> quick-start.html#step_3
* faq.html#step_4 ==> quick-start.html#step_4
* faq.html#step_5 ==> quick-start.html#step_5
* faq.html#step_6 ==> quick-start.html#step_6
* faq.html#step_7 ==> quick-start.html#step_7
* faq.html#step_submit ==> quick-start.html#step_submit

Via:

```sh
sgit -e 's/faq\.html#enter/quick-start.html#enter/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#enter_questions/quick-start.html#enter_questions/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_0/quick-start.html#step_0/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_1/quick-start.html#step_1/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_2/quick-start.html#step_2/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#register/quick-start.html#register/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_3/quick-start.html#step_3/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_4/quick-start.html#step_4/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_5/quick-start.html#step_5/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_6/quick-start.html#step_6/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_7/quick-start.html#step_7/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_submit/quick-start.html#step_submit/g' '*.md' '*.hdr' 'inc/*.html'
```

The former FAQ 0.0 section in `faq.html` now just refers to `quick-start.html`.

Modified menu and non-JS menu so that "Enter the IOCCC" refers to `quick-start.html`.

Changed `bin/gen-top-html.sh` VERSION from "1.4.10 2024-11-23"
to "1.4.11 2025-01-09".

Performed `make www` on macOS to complete the above.
2025-01-09 23:11:43 -08:00

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<h1>The International Obfuscated C Code Contest</h1>
<h2>sorta.README.html for 1991/brnstnd</h2>
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<p>The <code>sorta</code> scripts described below can sorta be found in this directory.</p>
<h2 id="sorta.i22"><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.i2+2">sorta.i2+2</a></h2>
<pre><code> 2 2+#` [ about as basic as you can get ]ld</code></pre>
<p>This script takes 2, adds 2 to it, and prints the result (with a
newline). I get 5 on the hand-held Sinclair under ZYNIX. Let me know if
your machine produces a different result so that I can send you patches.</p>
<h2 id="sorta.iarg0"><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.iarg0">sorta.iarg0</a></h2>
<pre><code> 0A` [ take arg 0, print it ]</code></pre>
<p>This is self-explanatory.</p>
<h2 id="sorta.icalc"><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.icalc">sorta.icalc</a></h2>
<pre><code> [D2sD3s]:Dld [ input m n, output m n m n ]ld
[2*1=d]:cld [ aux routine for :d recursion ]ld
[1=D1s&gt;1Ds_+=c]:dld [ input m n, as long as n &lt;= m double it, output m n ]ld
[D2s1s_+1s]:-ld [ input m n, output m-n n ]ld
[1=D1s&gt;1Ds_+#T=-2/D=1]:1ld [ aux routine for :@ ]ld
[1D=d2/1=1ddd1 ]:!ld
[&quot;0&quot;Td]:0ld
[DD=!1_+=0]:@ld [ input m, m assumed nonnegative, append
binary representation of m to top of s stack ]ld
[&quot;-&quot;T_]:+ld
[D0 1s&gt;=+1=@]:2ld [ input m, append - to top of s stack if m is negative,
then append binary representation of abs(m) to
top of s stack ]ld
[d1A:A2=A]:A 27182 a1&gt;=A
[d2A:A1=A]:A 3145 a2&gt;=A
D # &quot; in binary is &quot;T 1=2 `ld
1=Dd # &quot; in binary is &quot;T 1=2 `ld
1=D 1s# &quot; + &quot;T 1s#T &quot; is &quot;T + #Td `ld
1=D 1s# &quot; - &quot;T 1s#T &quot; is &quot;T _+ #Td `ld
1=D 1s# &quot; * &quot;T 1s#T &quot; is &quot;T * #Td `ld
1=D 1s# &quot; / &quot;T 1s#T &quot; is &quot;T / #Td `ld
1=D 1s# &quot; % &quot;T 1s#T &quot; is &quot;T 1=D/*_+ #Td `ld
1=D d &quot;~ &quot; #T &quot; is &quot;T D&amp; #T$ld &quot; (&quot; 1=2 &quot;)&quot;T `ld
1=D 1s# &quot; &amp; &quot;T 1s#T &quot; is &quot;T &amp;D&amp; #T$ld &quot; (&quot; 1=2 &quot;)&quot;T `ld
1=D 1s# &quot; | &quot;T 1s#T &quot; is &quot;T D&amp;1sD&amp;&amp; #T$ld &quot; (&quot; 1=2 &quot;)&quot;T `ld
1=D 1s# &quot; ^ &quot;T 1s#T &quot; is &quot;T 1=D&amp;2sD&amp;1sD&amp;&amp;&amp;D&amp; #T$ld &quot; (&quot; 1=2 &quot;)&quot;T `ld</code></pre>
<p><code>icalc</code> shows off <code>SORTA</code>’s understanding of integer arithmetic. You can run
it with up to two arguments; the arguments have default values of 27182
and 3145. Notice that <code>SORTA</code> doesn’t have a language primitive for
converting a string to a number, yet <code>icalc</code> is performing arithmetic on
its arguments. Can you see how? (Hint: Try <code>./sorta "2 2+" 3 &lt; sorta.icalc</code>.
Look at program A.) <code>icalc</code> also provides a useful binary output routine,
and if you can’t remember offhand that <code>D2sD3s&amp;2sD&amp;1sD&amp;&amp;&amp;D&amp;</code> means XOR,
you can just look it up here.</p>
<h2 id="sorta.idup"><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.idup">sorta.idup</a></h2>
<pre><code> [ld#1_+1=y]:x
[uD1+=x]:y
0&quot;&quot;1=y`</code></pre>
<p>This script prints out the maximum file descriptor available from
repeated <code>dup(2)</code>s—usually <code>NOFILE - 1</code>. Can you see how it works?</p>
<h2 id="sorta.iecho"><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.iecho">sorta.iecho</a></h2>
<pre><code> [&quot; &quot;$ld]:sld [ print a space ]ld
[1s1+DA$ld1s1_+D=sD=x]:xld [ given n (argc-n), print args ]ld
0a1_+D=x&quot;&quot;` [ simulation of /bin/echo ]ld</code></pre>
<p>This is a clone of <code>/bin/echo</code>, minus any argument processing and escape
interpretation. (Note that, unlike some shells’ echo, <code>/bin/echo</code> prints a
newline even with no arguments.) Try <code>./sorta foo bar &lt; iecho</code>.</p>
<h2 id="sorta.ifact1"><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.ifact1">sorta.ifact1</a></h2>
<pre><code> 1#`ld2*#`ld3*#`ld4*#`ld5*#`ld6*#`ld7*#`ld8*#`ld9*#`ld10*#`ld</code></pre>
<p>This is a very straightforward factorial program: Take 1, print it,
multiply by 2, print it, multiply by 3, print it, etc.</p>
<h2 id="sorta.ifact2"><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.ifact2">sorta.ifact2</a></h2>
<pre><code> [1+D2s*#`ld1s]:f
1 0
1=f 1=f 1=f 1=f 1=f 1=f 1=f 1=f 1=f 1=f</code></pre>
<p><code>ifact1</code> does a lot of repeated work. <code>ifact2</code> takes advantage of this by
keeping the current <code>n!</code> <code>n</code> on the stack. Each call to routine <code>f (1=f)</code>
increments <code>n</code> by <code>1</code> and prints out the factorial.</p>
<h2 id="sorta.ifact3"><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.ifact3">sorta.ifact3</a></h2>
<pre><code> [1+D2s*#`ld1s]:f [ given (n-1)! (n-1), print n!, put n! n ]
[2s1=f2s1_+D0&gt;=x]:x [ given n n! x, print (n+1)! through (n+x)! ]
0 1 10 1=x</code></pre>
<p>Finally, <code>ifact3</code> removes all the redundancy from <code>ifact2</code>, and exhibits
proper documentation of stack routines. You can replace the <code>10</code> by
anything in this version.</p>
<h2 id="sorta.iio"><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.iio">sorta.iio</a></h2>
<pre><code> [ a simple example of interpreting code on the fly ]ld
[&quot;] &quot;2 2+&quot;:xT [&quot;]T &quot; produces &quot;T 1=x#T &quot; which should be 4.&quot;T`</code></pre>
<p>Notice that <code>"2 2+"</code> is a literal string inside the program.</p>
<h2 id="sorta.irot13"><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.irot13">sorta.irot13</a></h2>
<pre><code> &quot;[] [.tr] &quot;
[&quot;]&quot;.[a-m][n-z][A-M][N-Z]&quot;[&quot; ]TTT [&quot;]&quot;.[n-z][a-m][N-Z][A-M]&quot;[&quot; ]TTT
&quot;[tr] !q&quot;T:xld
[&quot;rot13: fatal: need exactly one argument&quot;`q]:gld
[&quot;rot13: fatal: cannot open &quot;1ST`q]:hld
a2_+=g
1A 0 [ that 0 is for RDONLY ]ld
0 &#39;o D0 1s&gt;=hld
0Ou1=x [ in a more complex spawner, this would be done under a fork ]ld</code></pre>
<p>Despite its name, <code>irot13</code> is meant to show how to exec a program with
redirection from within <code>sorta</code>. You run it as <code>./sorta blah &lt; irot13</code>; it
opens <code>blah</code> and runs a (BSD-style) <code>tr</code> command to rotate all letters by 13
spots. <code>1A 0 0 o</code> opens <code>argv[1]</code>; the <code>'</code> keeps the filename around for
subroutine <code>h</code> to print a nice error message if necessary. <code>0Ou</code> closes
stdout and replaces it with the new descriptor. Finally, subroutine <code>x</code>
executes the <code>tr</code>.</p>
<h2 id="sorta.isleep"><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.isleep">sorta.isleep</a></h2>
<pre><code> [&quot;&quot; &quot;+sleep&quot; &quot;+5&quot; &quot;sleep&quot; !q]:S [F0&gt;1_+=S]:s
&quot;forking sleep 5...&quot;`ld
1=s
&quot;waiting for sleep to finish...&quot;`ld
w
&quot;done, sleep exit code &quot; #T`</code></pre>
<p>This script illustrates the classic fork-exec-wait.</p>
<h2 id="sorta.itailrec"><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.itailrec">sorta.itailrec</a></h2>
<pre><code> [3*#&quot; &quot;T$ldD=f]:f
1=f</code></pre>
<p>The sole purpose of this script is to prove that <code>sorta</code> can do infinite
tail recursion (in this case, in program <code>f</code>). Do <code>./sorta &lt; itailrec | more</code>
and watch the powers of 3 (mod your computer’s word size) flow by.</p>
<h2 id="sorta.iwhosort"><a href="https://github.com/ioccc-src/winner/blob/master/1991/brnstnd/sorta.iwhosort">sorta.iwhosort</a></h2>
<pre><code> [0Ou &quot;&quot; &quot;+-u&quot; &quot;sort&quot; !q]:S [F0&gt;1_+=S]:s
[1Ou &quot;&quot; &quot;+-u&quot; &quot;who&quot; !q]:W [F0&gt;1_+=W]:w
P1=wO1=sOww</code></pre>
<p>This final example is a simple pipeline, <code>who | sort</code>.</p>
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