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improved indentation and whitespace for markdown code blocks

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All code blocks in markdown have been intended by at least 4 spaces.

We add `--tab-stop=8` to all `pandoc(1)` executions in order to set
a better tab stop indentation, especially for tab intended code blocks.

Changed `bin/pandoc-wrapper.sh` VERSION from "1.5.3 2024-03-26"
to "1.6 2024-03-31".

Fixed `1991/brnstnd/sorta.README.md` so that the sorta code
is code blocks.

Removed unneeded paragraph group in copyright in `inc/footer.default.html`.

Fixed excess whitespace after list Author on entry `index.html` page.

Changed `bin/output-index-author.sh` VERSION from "1.5.2 2024-03-26"
to "1.6 2024-03-31".

Performed `make www` to perform the above and test under macOS.

TODO: Fix the problem of the initial line of code being extra intended.
TODO: Fix excess whitespace around code that is inline.
This commit is contained in:
Landon Curt Noll committed 2024-04-01 04:48:48 -07:00
1 parent b84c27ce02
commit a996f8d2b8
734 files changed
+16723 -16963
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2012/blakely/README.md
+16 -16
View File
@@ -1,7 +1,7 @@
## To build:
```sh
make
make
```
@@ -10,7 +10,7 @@ make
The current status of this entry is:
```
STATUS: INABIAF - please **DO NOT** fix
STATUS: INABIAF - please **DO NOT** fix
```
For more detailed information see [2012 blakely bugs](../../bugs.html#2012_blakely).
@@ -19,14 +19,14 @@ For more detailed information see [2012 blakely bugs](../../bugs.html#2012_blake
## To use:
```sh
./blakely "RPN formula" resolution > output.gif
./blakely "RPN formula" resolution > output.gif
```
## Try:
```sh
./try.sh
./try.sh
```
@@ -60,7 +60,7 @@ output to `stdout`.
The program should be run as:
```sh
./blakely xy* 32 > pic.gif
./blakely xy* 32 > pic.gif
```
where the first parameter is a
@@ -73,15 +73,15 @@ Notation](https://en.wikipedia.org/wiki/Reverse_Polish_notation) with the
following characters recognised:
```
+, -, *, / - usual arithmetic operations
^ - Exponentiation; valid for constant exponent only
s - sin
c - cos
0-9 - single digit integers
d - duplicate number on stack
t - transpose top two elements on stack
x - x coordinate value
y - y coordinate value
+, -, *, / - usual arithmetic operations
^ - Exponentiation; valid for constant exponent only
s - sin
c - cos
0-9 - single digit integers
d - duplicate number on stack
t - transpose top two elements on stack
x - x coordinate value
y - y coordinate value
```
NB: all arithmetic is done in double precision, so `23/` is two-thirds, rather
@@ -106,9 +106,9 @@ to 250 took ~35 minutes to render on an [i7
processor](https://en.wikipedia.org/wiki/Intel_Core#Core_i7).
```sh
./blakely xy* 32 > saddle.gif
./blakely xy* 32 > saddle.gif
./blakely xx*yy*1++d5*ct/ 64 > ripple.gif
./blakely xx*yy*1++d5*ct/ 64 > ripple.gif
```
2012/blakely/index.html
+17 -18
View File
@@ -132,8 +132,7 @@
<h2 id="author"><a name="author"></a>Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Philip_Blakely">Philip Blakely</a><br>
Location: <a href="../../location.html#GB">GB</a> - <em>United Kingdom of Great Britain and Northern Ireland</em> (<em>United Kingdom</em>)
<br><br></li>
Location: <a href="../../location.html#GB">GB</a> - <em>United Kingdom of Great Britain and Northern Ireland</em> (<em>United Kingdom</em>)</li>
</ul>
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -142,15 +141,15 @@ Location: <a href="../../location.html#GB">GB</a> - <em>United Kingdom of Great
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
<h2 id="to-build">To build:</h2>
<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>
<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>
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
<p>The current status of this entry is:</p>
<pre><code>STATUS: INABIAF - please **DO NOT** fix</code></pre>
<pre><code> STATUS: INABIAF - please **DO NOT** fix</code></pre>
<p>For more detailed information see <a href="../../bugs.html#2012_blakely">2012 blakely bugs</a>.</p>
<h2 id="to-use">To use:</h2>
<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">./blakely</span> <span class="st">&quot;RPN formula&quot;</span> resolution <span class="op">&gt;</span> output.gif</span></code></pre></div>
<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">./blakely</span> <span class="st">&quot;RPN formula&quot;</span> resolution <span class="op">&gt;</span> output.gif</span></code></pre></div>
<h2 id="try">Try:</h2>
<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>
<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>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>Several IOCCC themes (<a href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">RPN
calculator</a>, animated
@@ -170,7 +169,7 @@ resolution, and an animated GIF showing a fly-around of the resulting surface is
output to <code>stdout</code>.</p>
<h3 id="usage">Usage</h3>
<p>The program should be run as:</p>
<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="ex">./blakely</span> xy<span class="pp">*</span> 32 <span class="op">&gt;</span> pic.gif</span></code></pre></div>
<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="ex">./blakely</span> xy<span class="pp">*</span> 32 <span class="op">&gt;</span> pic.gif</span></code></pre></div>
<p>where the first parameter is a
<a href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">RPN</a> expression, and the
second is the width of the required <a href="https://en.wikipedia.org/wiki/GIF">GIF</a>, up
@@ -178,15 +177,15 @@ to a maximum of 250.</p>
<p>The expressions are written in <a href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">Reverse Polish
Notation</a> with the
following characters recognised:</p>
<pre><code>+, -, *, / - usual arithmetic operations
^ - Exponentiation; valid for constant exponent only
s - sin
c - cos
0-9 - single digit integers
d - duplicate number on stack
t - transpose top two elements on stack
x - x coordinate value
y - y coordinate value</code></pre>
<pre><code> +, -, *, / - usual arithmetic operations
^ - Exponentiation; valid for constant exponent only
s - sin
c - cos
0-9 - single digit integers
d - duplicate number on stack
t - transpose top two elements on stack
x - x coordinate value
y - y coordinate value</code></pre>
<p>NB: all arithmetic is done in double precision, so <code>23/</code> is two-thirds, rather
than 0.</p>
<p>The surface plotted corresponds to <code>-1 &lt;= x,y &lt;= 1</code> and for best results, the
@@ -202,9 +201,9 @@ and more complex expressions take longer to compute. For example, increasing the
resolution of <code>ripple.gif</code>
to 250 took ~35 minutes to render on an <a href="https://en.wikipedia.org/wiki/Intel_Core#Core_i7">i7
processor</a>.</p>
<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">./blakely</span> xy<span class="pp">*</span> 32 <span class="op">&gt;</span> saddle.gif</span>
<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">./blakely</span> xy<span class="pp">*</span> 32 <span class="op">&gt;</span> saddle.gif</span>
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a><span class="ex">./blakely</span> xx<span class="pp">*</span>yy<span class="pp">*</span>1++d5<span class="pp">*</span>ct/ 64 <span class="op">&gt;</span> ripple.gif</span></code></pre></div>
<span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">./blakely</span> xx<span class="pp">*</span>yy<span class="pp">*</span>1++d5<span class="pp">*</span>ct/ 64 <span class="op">&gt;</span> ripple.gif</span></code></pre></div>
<h3 id="algorithm">Algorithm</h3>
<p>A generic root-finding algorithm to find the point of intersection between a ray
and the surface is done using a simple forward search from the eye. In order to
2012/deckmyn/README.md
+8 -8
View File
@@ -1,7 +1,7 @@
## To build:
```sh
make
make
```
@@ -10,7 +10,7 @@ make
The current status of this entry is:
```
STATUS: INABIAF - please **DO NOT** fix
STATUS: INABIAF - please **DO NOT** fix
```
For more detailed information see [2012 deckmyn bugs](../../bugs.html#2012_deckmyn).
@@ -19,14 +19,14 @@ For more detailed information see [2012 deckmyn bugs](../../bugs.html#2012_deckm
## To use:
```sh
./deckmyn "$(cat deckmyn.c)" "$(cat musicfile.txt)" > sheetmusic.pbm
./deckmyn "$(cat deckmyn.c)" "$(cat musicfile.txt)" > sheetmusic.pbm
```
## Try:
```sh
./try.sh
./try.sh
```
@@ -60,13 +60,13 @@ manual input as below) ready and a program capable of showing [.pbm bitmap
format](https://en.wikipedia.org/wiki/Netpbm) images.
```sh
./deckmyn "`cat deckmyn.c`" "`cat example_greensleeves`" > greensleeves.pbm
./deckmyn "`cat deckmyn.c`" "`cat example_greensleeves`" > greensleeves.pbm
```
If you have macOS you can open the image like:
```sh
open greensleeves.pbm
open greensleeves.pbm
```
... otherwise, you'll have to open it in your viewer of choice how you would
@@ -74,13 +74,13 @@ normally open an image.
```sh
./deckmyn "`cat deckmyn.c`" "KF m44c4 c4 g4 g4 : a4 a4 g2 :; " > short_bass.pbm
./deckmyn "`cat deckmyn.c`" "KF m44c4 c4 g4 g4 : a4 a4 g2 :; " > short_bass.pbm
```
If you have macOS you can open the image like:
```sh
open short_bass.pbm
open short_bass.pbm
```
... otherwise, you'll have to open it in your viewer of choice how you would
2012/deckmyn/deckmyn.html
+3 -3
View File
@@ -124,7 +124,7 @@
<h1 id="user-manual">USER MANUAL</h1>
<h2 id="calling-the-program">Calling the program</h2>
<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="ex">./deckmyn</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> deckmyn.c<span class="kw">`</span><span class="st">&quot;</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> musicfile<span class="kw">`</span><span class="st">&quot;</span> <span class="op">&gt;</span> output.pbm</span></code></pre></div>
<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="ex">./deckmyn</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> deckmyn.c<span class="kw">`</span><span class="st">&quot;</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> musicfile<span class="kw">`</span><span class="st">&quot;</span> <span class="op">&gt;</span> output.pbm</span></code></pre></div>
<p>Then display <code>output.pbm</code>.</p>
<p>This minimalistic music notator expects two command line arguments. The first is
the font description embedded in the source code. Notice that you don’t pass the
@@ -186,9 +186,9 @@ clef. <code>"K"</code> followed by any other letter will just default to a stand
</ol>
<h2 id="examples">Examples</h2>
<p>Blank music paper (with G clef):</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./deckmyn</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> deckmyn.c<span class="kw">`</span><span class="st">&quot;</span> <span class="st">&quot;sz sa x s1 x s1 x s1 x s1 x s1 &quot;</span><span class="op">&gt;</span> blank.pbm</span></code></pre></div>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./deckmyn</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> deckmyn.c<span class="kw">`</span><span class="st">&quot;</span> <span class="st">&quot;sz sa x s1 x s1 x s1 x s1 x s1 &quot;</span><span class="op">&gt;</span> blank.pbm</span></code></pre></div>
<p>With an F clef:</p>
<pre><code>./deckmyn &quot;`cat deckmyn.c`&quot; &quot;KF sz sa x s1 x s1 x s1 x s1 x s1 &quot;&gt; blank.pbm</code></pre>
<pre><code> ./deckmyn &quot;`cat deckmyn.c`&quot; &quot;KF sz sa x s1 x s1 x s1 x s1 x s1 &quot;&gt; blank.pbm</code></pre>
<p>Notice how only the first staff (or any staff) needs to have the full length.</p>
<p>Some files with well-known melodies are included as examples.</p>
<!--
2012/deckmyn/deckmyn.md
+3 -3
View File
@@ -4,7 +4,7 @@
## Calling the program
```sh
./deckmyn "`cat deckmyn.c`" "`cat musicfile`" > output.pbm
./deckmyn "`cat deckmyn.c`" "`cat musicfile`" > output.pbm
```
Then display `output.pbm`.
@@ -86,13 +86,13 @@ musical element of a line is only 2 characters!
Blank music paper (with G clef):
```sh
./deckmyn "`cat deckmyn.c`" "sz sa x s1 x s1 x s1 x s1 x s1 "> blank.pbm
./deckmyn "`cat deckmyn.c`" "sz sa x s1 x s1 x s1 x s1 x s1 "> blank.pbm
```
With an F clef:
```
./deckmyn "`cat deckmyn.c`" "KF sz sa x s1 x s1 x s1 x s1 x s1 "> blank.pbm
./deckmyn "`cat deckmyn.c`" "KF sz sa x s1 x s1 x s1 x s1 x s1 "> blank.pbm
```
Notice how only the first staff (or any staff) needs to have the full length.
2012/deckmyn/index.html
+9 -10
View File
@@ -132,8 +132,7 @@
<h2 id="author"><a name="author"></a>Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Alex_Deckmyn">Alex Deckmyn</a><br>
Location: <a href="../../location.html#BE">BE</a> - <em>Kingdom of Belgium</em> (<em>Belgium</em>)
<br><br></li>
Location: <a href="../../location.html#BE">BE</a> - <em>Kingdom of Belgium</em> (<em>Belgium</em>)</li>
</ul>
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -142,15 +141,15 @@ Location: <a href="../../location.html#BE">BE</a> - <em>Kingdom of Belgium</em>
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
<h2 id="to-build">To build:</h2>
<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>
<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>
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
<p>The current status of this entry is:</p>
<pre><code>STATUS: INABIAF - please **DO NOT** fix</code></pre>
<pre><code> STATUS: INABIAF - please **DO NOT** fix</code></pre>
<p>For more detailed information see <a href="../../bugs.html#2012_deckmyn">2012 deckmyn bugs</a>.</p>
<h2 id="to-use">To use:</h2>
<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">./deckmyn</span> <span class="st">&quot;</span><span class="va">$(</span><span class="fu">cat</span> deckmyn.c<span class="va">)</span><span class="st">&quot;</span> <span class="st">&quot;</span><span class="va">$(</span><span class="fu">cat</span> musicfile.txt<span class="va">)</span><span class="st">&quot;</span> <span class="op">&gt;</span> sheetmusic.pbm</span></code></pre></div>
<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">./deckmyn</span> <span class="st">&quot;</span><span class="va">$(</span><span class="fu">cat</span> deckmyn.c<span class="va">)</span><span class="st">&quot;</span> <span class="st">&quot;</span><span class="va">$(</span><span class="fu">cat</span> musicfile.txt<span class="va">)</span><span class="st">&quot;</span> <span class="op">&gt;</span> sheetmusic.pbm</span></code></pre></div>
<h2 id="try">Try:</h2>
<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>
<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>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>The C of this entry is definitely sharp. The program cleverly uses its own
source at runtime to define the notes, time signature and accidental bitmaps.</p>
@@ -169,14 +168,14 @@ is not done in the author’s remarks, however.</p>
<p>You need the source code and example input (either one of the example files, or
manual input as below) ready and a program capable of showing <a href="https://en.wikipedia.org/wiki/Netpbm">.pbm bitmap
format</a> images.</p>
<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="ex">./deckmyn</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> deckmyn.c<span class="kw">`</span><span class="st">&quot;</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> example_greensleeves<span class="kw">`</span><span class="st">&quot;</span> <span class="op">&gt;</span> greensleeves.pbm</span></code></pre></div>
<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="ex">./deckmyn</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> deckmyn.c<span class="kw">`</span><span class="st">&quot;</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> example_greensleeves<span class="kw">`</span><span class="st">&quot;</span> <span class="op">&gt;</span> greensleeves.pbm</span></code></pre></div>
<p>If you have macOS you can open the image like:</p>
<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="ex">open</span> greensleeves.pbm</span></code></pre></div>
<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="ex">open</span> greensleeves.pbm</span></code></pre></div>
<p>… otherwise, you’ll have to open it in your viewer of choice how you would
normally open an image.</p>
<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">./deckmyn</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> deckmyn.c<span class="kw">`</span><span class="st">&quot;</span> <span class="st">&quot;KF m44c4 c4 g4 g4 : a4 a4 g2 :; &quot;</span> <span class="op">&gt;</span> short_bass.pbm</span></code></pre></div>
<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">./deckmyn</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> deckmyn.c<span class="kw">`</span><span class="st">&quot;</span> <span class="st">&quot;KF m44c4 c4 g4 g4 : a4 a4 g2 :; &quot;</span> <span class="op">&gt;</span> short_bass.pbm</span></code></pre></div>
<p>If you have macOS you can open the image like:</p>
<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">open</span> short_bass.pbm</span></code></pre></div>
<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">open</span> short_bass.pbm</span></code></pre></div>
<p>… otherwise, you’ll have to open it in your viewer of choice how you would
normally open an image.</p>
<h3 id="description">Description</h3>
2012/dlowe/README.md
+4 -4
View File
@@ -1,7 +1,7 @@
## To build:
```sh
make
make
```
@@ -10,7 +10,7 @@ make
The current status of this entry is:
```
STATUS: INABIAF - please **DO NOT** fix
STATUS: INABIAF - please **DO NOT** fix
```
For more detailed information see [2012 dlowe bugs](../../bugs.html#2012_dlowe).
@@ -19,14 +19,14 @@ For more detailed information see [2012 dlowe bugs](../../bugs.html#2012_dlowe).
## To use:
```sh
./dlowe
./dlowe
```
## Try:
```sh
./dlowe
./dlowe
```
Watch for a while if you like, then press a key within the window.
2012/dlowe/index.html
+5 -6
View File
@@ -132,8 +132,7 @@
<h2 id="author"><a name="author"></a>Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#J_David_Lowe">J. David Lowe</a><br>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)
<br><br></li>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
</ul>
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -142,15 +141,15 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
<h2 id="to-build">To build:</h2>
<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>
<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>
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
<p>The current status of this entry is:</p>
<pre><code>STATUS: INABIAF - please **DO NOT** fix</code></pre>
<pre><code> STATUS: INABIAF - please **DO NOT** fix</code></pre>
<p>For more detailed information see <a href="../../bugs.html#2012_dlowe">2012 dlowe bugs</a>.</p>
<h2 id="to-use">To use:</h2>
<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">./dlowe</span></span></code></pre></div>
<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">./dlowe</span></span></code></pre></div>
<h2 id="try">Try:</h2>
<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">./dlowe</span></span></code></pre></div>
<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">./dlowe</span></span></code></pre></div>
<p>Watch for a while if you like, then press a key within the window.</p>
<p>Use up and down keys to escape death.</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
2012/endoh1/README.md
+29 -29
View File
@@ -1,6 +1,6 @@
```sh
make
make
```
There are two alt versions that let you control the compile time variables that
@@ -15,7 +15,7 @@ section below for more details.
## To use:
```sh
./endoh1 < file
./endoh1 < file
```
WARNING: if you're sensitive to/don't like flashing colours/text or just want to
@@ -26,14 +26,14 @@ see what this looks like not going so fast then you might wish to try the
## Try:
```sh
./try.bw.sh endoh1.c
./try.sh endoh1.c
./try.bw.sh endoh1.c
./try.sh endoh1.c
./try.bw.sh pour-out.txt
./try.sh pour-out.txt
./try.bw.sh pour-out.txt
./try.sh pour-out.txt
./try.bw.sh fountain.txt
./try.sh fountain.txt
./try.bw.sh fountain.txt
./try.sh fountain.txt
```
@@ -51,7 +51,7 @@ the fluid and change the behaviour of the fluid. The file
For the default values, try:
```sh
make alt
make alt
```
In the `alt` versions a default time of 10 seconds is set as an alarm so that
@@ -60,13 +60,13 @@ for fun. That is controlled by the variable `TIMER` at compilation.
For instance if you wish to change the value to 5:
```sh
make clobber TIMER=5 alt
make clobber TIMER=5 alt
```
If you want to disable the alarm time, set it to 0:
```sh
make clobber TIMER=0 alt
make clobber TIMER=0 alt
```
It cannot be < 0 or > 60 (arbitrarily selected).
@@ -77,7 +77,7 @@ defaults to 12321 but you can change it to. For instance to slow it down you
could increase the sleep time from `12321` to `50000`:
```sh
make clobber SLEEP=50000 alt
make clobber SLEEP=50000 alt
```
@@ -85,7 +85,7 @@ If you wish to speed it up you might decrease the sleep time from `12321` to
`9999`:
```sh
make clobber SLEEP=9999 alt
make clobber SLEEP=9999 alt
```
WARNING: the lower the value the faster it will flash so be careful if you're
@@ -98,7 +98,7 @@ viscosity factor, you should redefine the values `GRAVITY`, `PRESSURE` and/or
viscosity and pressure factors but leave the other values alone:
```sh
make clobber VISCOSITY=X PRESSURE=Y alt
make clobber VISCOSITY=X PRESSURE=Y alt
```
where `X` and `Y` are numbers or the letter `I` and which are, respectively, the
@@ -112,21 +112,21 @@ instance:
```sh
make clobber GRAVITY=5 PRESSURE=5 VISCOSITY=5 alt
make clobber GRAVITY=5 PRESSURE=5 VISCOSITY=5 alt
```
You might try even:
```sh
make clobber GRAVITY=I alt
make clobber GRAVITY=I alt
```
See the author's remarks for details on these macros where:
```
G = GRAVITY
P = PRESSURE
V = VISCOSITY
G = GRAVITY
P = PRESSURE
V = VISCOSITY
```
@@ -142,7 +142,7 @@ To see two different ways run on the source file and each of the text files,
try:
```sh
./try.alt.sh
./try.alt.sh
```
The second run of each will be with the gravity factor set to `I`.
@@ -150,7 +150,7 @@ The second run of each will be with the gravity factor set to `I`.
To see the same thing but in the original uncoloured version, try:
```sh
./try.alt.bw.sh
./try.alt.bw.sh
```
@@ -179,12 +179,12 @@ entry](https://web.archive.org/web/20230711134609/https://whatif.xkcd.com/6/).
than 80 x 25.
```sh
cc endoh1.c -DG=1 -DP=4 -DV=8 -D_BSD_SOURCE -o endoh1 -lm
./endoh1 < endoh1.c
./endoh1 < logo.txt
./endoh1 < column.txt
./endoh1 < pour-out.txt
./endoh1 < tanada.txt
cc endoh1.c -DG=1 -DP=4 -DV=8 -D_BSD_SOURCE -o endoh1 -lm
./endoh1 < endoh1.c
./endoh1 < logo.txt
./endoh1 < column.txt
./endoh1 < pour-out.txt
./endoh1 < tanada.txt
```
### What it is
@@ -247,9 +247,9 @@ At least, recent compilers with `-std=c99 -Wall -W -Wextra -pedantic` say
nothing.
```sh
gcc -DG=1 -DP=4 -DV=8 -D_BSD_SOURCE -std=c99 -Wall -W -Wextra -pedantic endoh1.c
gcc -DG=1 -DP=4 -DV=8 -D_BSD_SOURCE -std=c99 -Wall -W -Wextra -pedantic endoh1.c
clang -DG=1 -DP=4 -DV=8 -D_BSD_SOURCE -std=c99 -Wall -W -Wextra -pedantic endoh1.c
clang -DG=1 -DP=4 -DV=8 -D_BSD_SOURCE -std=c99 -Wall -W -Wextra -pedantic endoh1.c
```
I expect it to work in any Unix-like environment. VTxxx/ANSI sequences are
2012/endoh1/index.html
+30 -31
View File
@@ -132,8 +132,7 @@
<h2 id="author"><a name="author"></a>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>
<br><br></li>
Location: <a href="../../location.html#JP">JP</a> - <em>Japan</em></li>
</ul>
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -141,7 +140,7 @@ Location: <a href="../../location.html#JP">JP</a> - <em>Japan</em>
<!-- END: this line ends content for HTML phase 20 by: bin/output-index-author.sh via bin/md2html.sh -->
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
<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>
<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>
<p>There are two alt versions that let you control the compile time variables that
control the fluid behaviour and the added variables to speed up or slow down the
fluid as well as setting a timeout (if not 0): one for the original black and
@@ -150,19 +149,19 @@ judges at the time of the contest). Another version is the deobfuscated version
provided by the author as well. See the <a href="#alternate-code">Alternate code</a>
section below for more details.</p>
<h2 id="to-use">To use:</h2>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./endoh1</span> <span class="op">&lt;</span> file</span></code></pre></div>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./endoh1</span> <span class="op">&lt;</span> file</span></code></pre></div>
<p>WARNING: if you’re sensitive to/don’t like flashing colours/text or just want to
see what this looks like not going so fast then you might wish to try the
<a href="#alternate-code">Alternate code</a> instead.</p>
<h2 id="try">Try:</h2>
<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">./try.bw.sh</span> endoh1.c</span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.sh</span> endoh1.c</span>
<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">./try.bw.sh</span> endoh1.c</span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">./try.sh</span> endoh1.c</span>
<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb3-4"><a href="#cb3-4" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.bw.sh</span> pour-out.txt</span>
<span id="cb3-5"><a href="#cb3-5" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.sh</span> pour-out.txt</span>
<span id="cb3-4"><a href="#cb3-4" aria-hidden="true" tabindex="-1"></a> <span class="ex">./try.bw.sh</span> pour-out.txt</span>
<span id="cb3-5"><a href="#cb3-5" aria-hidden="true" tabindex="-1"></a> <span class="ex">./try.sh</span> pour-out.txt</span>
<span id="cb3-6"><a href="#cb3-6" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb3-7"><a href="#cb3-7" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.bw.sh</span> fountain.txt</span>
<span id="cb3-8"><a href="#cb3-8" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.sh</span> fountain.txt</span></code></pre></div>
<span id="cb3-7"><a href="#cb3-7" aria-hidden="true" tabindex="-1"></a> <span class="ex">./try.bw.sh</span> fountain.txt</span>
<span id="cb3-8"><a href="#cb3-8" aria-hidden="true" tabindex="-1"></a> <span class="ex">./try.sh</span> fountain.txt</span></code></pre></div>
<h2 id="alternate-code">Alternate code:</h2>
<p>The files <a href="endoh1.alt.c">endoh1.alt.c</a> and
<a href="endoh1_color.alt.c">endoh1_color.alt.c</a> correspond to <a href="endoh1.c">endoh1.c</a> and
@@ -171,53 +170,53 @@ the fluid and change the behaviour of the fluid. The file
<a href="endoh1.alt.c">endoh1.alt2.c</a> is deobfuscated and was provided by the author.</p>
<h3 id="alternate-build">Alternate build:</h3>
<p>For the default values, try:</p>
<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="fu">make</span> alt</span></code></pre></div>
<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="fu">make</span> alt</span></code></pre></div>
<p>In the <code>alt</code> versions a default time of 10 seconds is set as an alarm so that
one can more easily go through the list of files to see them all in succession,
for fun. That is controlled by the variable <code>TIMER</code> at compilation.
For instance if you wish to change the value to 5:</p>
<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">make</span> clobber TIMER=5 alt</span></code></pre></div>
<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">make</span> clobber TIMER=5 alt</span></code></pre></div>
<p>If you want to disable the alarm time, set it to 0:</p>
<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">make</span> clobber TIMER=0 alt</span></code></pre></div>
<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">make</span> clobber TIMER=0 alt</span></code></pre></div>
<p>It cannot be &lt; 0 or &gt; 60 (arbitrarily selected).</p>
<p>The <code>SLEEP</code> variable is to delay the time between updates to make it easier to
see and to not flash too quickly. The code protects against a value &lt; 0 and
defaults to 12321 but you can change it to. For instance to slow it down you
could increase the sleep time from <code>12321</code> to <code>50000</code>:</p>
<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="fu">make</span> clobber SLEEP=50000 alt</span></code></pre></div>
<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="fu">make</span> clobber SLEEP=50000 alt</span></code></pre></div>
<p>If you wish to speed it up you might decrease the sleep time from <code>12321</code> to
<code>9999</code>:</p>
<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="fu">make</span> clobber SLEEP=9999 alt</span></code></pre></div>
<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="fu">make</span> clobber SLEEP=9999 alt</span></code></pre></div>
<p>WARNING: the lower the value the faster it will flash so be careful if you’re
sensitive to this.</p>
<p>If you wish to change the gravity factor, pressure factor and/or
viscosity factor, you should redefine the values <code>GRAVITY</code>, <code>PRESSURE</code> and/or
<code>VISCOSITY</code> macros, respectively. For instance if you wish to change the
viscosity and pressure factors but leave the other values alone:</p>
<div class="sourceCode" id="cb9"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span> clobber VISCOSITY=X PRESSURE=Y alt</span></code></pre></div>
<div class="sourceCode" id="cb9"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a> <span class="fu">make</span> clobber VISCOSITY=X PRESSURE=Y alt</span></code></pre></div>
<p>where <code>X</code> and <code>Y</code> are numbers or the letter <code>I</code> and which are, respectively, the
viscosity and pressure factors. There is no attempt to check the value or type
because doing so prevents the macros from being defined to <code>I</code> which would
prevent the author’s remarks about it from being done.</p>
<p>You might also wish to try redefining the macros <code>G</code>, <code>P</code> and/or <code>V</code>. For
instance:</p>
<div class="sourceCode" id="cb10"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span> clobber GRAVITY=5 PRESSURE=5 VISCOSITY=5 alt</span></code></pre></div>
<div class="sourceCode" id="cb10"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a> <span class="fu">make</span> clobber GRAVITY=5 PRESSURE=5 VISCOSITY=5 alt</span></code></pre></div>
<p>You might try even:</p>
<div class="sourceCode" id="cb11"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span> clobber GRAVITY=I alt</span></code></pre></div>
<div class="sourceCode" id="cb11"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a> <span class="fu">make</span> clobber GRAVITY=I alt</span></code></pre></div>
<p>See the author’s remarks for details on these macros where:</p>
<pre><code>G = GRAVITY
P = PRESSURE
V = VISCOSITY</code></pre>
<pre><code> G = GRAVITY
P = PRESSURE
V = VISCOSITY</code></pre>
<h3 id="alternate-use">Alternate use:</h3>
<p>Use <code>endoh1.alt</code>, <code>endoh1_color.alt</code> and <code>endoh1.alt2</code> as you would <code>endoh1</code>
and <code>endoh1_color</code> above.</p>
<h3 id="alternate-try">Alternate try:</h3>
<p>To see two different ways run on the source file and each of the text files,
try:</p>
<div class="sourceCode" id="cb13"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb13-1"><a href="#cb13-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.alt.sh</span></span></code></pre></div>
<div class="sourceCode" id="cb13"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb13-1"><a href="#cb13-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./try.alt.sh</span></span></code></pre></div>
<p>The second run of each will be with the gravity factor set to <code>I</code>.</p>
<p>To see the same thing but in the original uncoloured version, try:</p>
<div class="sourceCode" id="cb14"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb14-1"><a href="#cb14-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.alt.bw.sh</span></span></code></pre></div>
<div class="sourceCode" id="cb14"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb14-1"><a href="#cb14-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./try.alt.bw.sh</span></span></code></pre></div>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>Let’s play <a href="https://en.wikipedia.org/wiki/Jeopardy!">Jeopardy!</a></p>
<p>A: An obfuscated program that deals with complex numbers and produces animated ASCII graphics.
@@ -232,12 +231,12 @@ entry</a>.</p>
<h3 id="synopsis">Synopsis</h3>
<p><strong>DO NOT FORGET</strong> <code>-DG=1 -DP=4 -DV=8</code> and make your terminal window larger
than 80 x 25.</p>
<div class="sourceCode" id="cb15"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb15-1"><a href="#cb15-1" aria-hidden="true" tabindex="-1"></a><span class="fu">cc</span> endoh1.c <span class="at">-DG</span><span class="op">=</span>1 <span class="at">-DP</span><span class="op">=</span>4 <span class="at">-DV</span><span class="op">=</span>8 <span class="at">-D_BSD_SOURCE</span> <span class="at">-o</span> endoh1 <span class="at">-lm</span></span>
<span id="cb15-2"><a href="#cb15-2" aria-hidden="true" tabindex="-1"></a><span class="ex">./endoh1</span> <span class="op">&lt;</span> endoh1.c</span>
<span id="cb15-3"><a href="#cb15-3" aria-hidden="true" tabindex="-1"></a><span class="ex">./endoh1</span> <span class="op">&lt;</span> logo.txt</span>
<span id="cb15-4"><a href="#cb15-4" aria-hidden="true" tabindex="-1"></a><span class="ex">./endoh1</span> <span class="op">&lt;</span> column.txt</span>
<span id="cb15-5"><a href="#cb15-5" aria-hidden="true" tabindex="-1"></a><span class="ex">./endoh1</span> <span class="op">&lt;</span> pour-out.txt</span>
<span id="cb15-6"><a href="#cb15-6" aria-hidden="true" tabindex="-1"></a><span class="ex">./endoh1</span> <span class="op">&lt;</span> tanada.txt</span></code></pre></div>
<div class="sourceCode" id="cb15"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb15-1"><a href="#cb15-1" aria-hidden="true" tabindex="-1"></a> <span class="fu">cc</span> endoh1.c <span class="at">-DG</span><span class="op">=</span>1 <span class="at">-DP</span><span class="op">=</span>4 <span class="at">-DV</span><span class="op">=</span>8 <span class="at">-D_BSD_SOURCE</span> <span class="at">-o</span> endoh1 <span class="at">-lm</span></span>
<span id="cb15-2"><a href="#cb15-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">./endoh1</span> <span class="op">&lt;</span> endoh1.c</span>
<span id="cb15-3"><a href="#cb15-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">./endoh1</span> <span class="op">&lt;</span> logo.txt</span>
<span id="cb15-4"><a href="#cb15-4" aria-hidden="true" tabindex="-1"></a> <span class="ex">./endoh1</span> <span class="op">&lt;</span> column.txt</span>
<span id="cb15-5"><a href="#cb15-5" aria-hidden="true" tabindex="-1"></a> <span class="ex">./endoh1</span> <span class="op">&lt;</span> pour-out.txt</span>
<span id="cb15-6"><a href="#cb15-6" aria-hidden="true" tabindex="-1"></a> <span class="ex">./endoh1</span> <span class="op">&lt;</span> tanada.txt</span></code></pre></div>
<h3 id="what-it-is">What it is</h3>
<pre><code> ,___. ,. ,. ,. ,___. ,. ,. ,.
|/--&#39; || `&#39; || |/--&#39; `&#39; || |\_.
@@ -285,9 +284,9 @@ comments. It also uses <code>usleep(3)</code>, which may require <code>-D_BSD_SO
to build with no warning. Under these conditions, it should be portable.
At least, recent compilers with <code>-std=c99 -Wall -W -Wextra -pedantic</code> say
nothing.</p>
<div class="sourceCode" id="cb17"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb17-1"><a href="#cb17-1" aria-hidden="true" tabindex="-1"></a><span class="fu">gcc</span> <span class="at">-DG</span><span class="op">=</span>1 <span class="at">-DP</span><span class="op">=</span>4 <span class="at">-DV</span><span class="op">=</span>8 <span class="at">-D_BSD_SOURCE</span> <span class="at">-std</span><span class="op">=</span>c99 <span class="at">-Wall</span> <span class="at">-W</span> <span class="at">-Wextra</span> <span class="at">-pedantic</span> endoh1.c</span>
<div class="sourceCode" id="cb17"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb17-1"><a href="#cb17-1" aria-hidden="true" tabindex="-1"></a> <span class="fu">gcc</span> <span class="at">-DG</span><span class="op">=</span>1 <span class="at">-DP</span><span class="op">=</span>4 <span class="at">-DV</span><span class="op">=</span>8 <span class="at">-D_BSD_SOURCE</span> <span class="at">-std</span><span class="op">=</span>c99 <span class="at">-Wall</span> <span class="at">-W</span> <span class="at">-Wextra</span> <span class="at">-pedantic</span> endoh1.c</span>
<span id="cb17-2"><a href="#cb17-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb17-3"><a href="#cb17-3" aria-hidden="true" tabindex="-1"></a><span class="fu">clang</span> <span class="at">-DG</span><span class="op">=</span>1 <span class="at">-DP</span><span class="op">=</span>4 <span class="at">-DV</span><span class="op">=</span>8 <span class="at">-D_BSD_SOURCE</span> <span class="at">-std</span><span class="op">=</span>c99 <span class="at">-Wall</span> <span class="at">-W</span> <span class="at">-Wextra</span> <span class="at">-pedantic</span> endoh1.c</span></code></pre></div>
<span id="cb17-3"><a href="#cb17-3" aria-hidden="true" tabindex="-1"></a> <span class="fu">clang</span> <span class="at">-DG</span><span class="op">=</span>1 <span class="at">-DP</span><span class="op">=</span>4 <span class="at">-DV</span><span class="op">=</span>8 <span class="at">-D_BSD_SOURCE</span> <span class="at">-std</span><span class="op">=</span>c99 <span class="at">-Wall</span> <span class="at">-W</span> <span class="at">-Wextra</span> <span class="at">-pedantic</span> endoh1.c</span></code></pre></div>
<p>I expect it to work in any Unix-like environment. VTxxx/ANSI sequences are
used to clear screen and move cursor to home.</p>
<p>I’ve tested with gcc-4.6.3 and clang-3.0 on Linux (Ubuntu 12.04)
2012/endoh2/README.md
+27 -27
View File
@@ -1,24 +1,24 @@
## To build:
```sh
make
make
```
## To use:
```sh
./endoh2 > pi.c
gcc -o pi pi.c
./pi > 314.c
./endoh2 > pi.c
gcc -o pi pi.c
./pi > 314.c
```
and:
```sh
./endoh2 e > e.c\
gcc -o e e.c
./e > 271.c
./endoh2 e > e.c\
gcc -o e e.c
./e > 271.c
```
...
@@ -27,7 +27,7 @@ gcc -o e e.c
## Try:
```sh
./try.sh
./try.sh
```
@@ -113,8 +113,8 @@ with `-std=c99 -Wall -W -Wextra -pedantic` would say nothing.
```sh
gcc -std=c99 -Wall -W -Wextra -pedantic spigot.c
clang -std=c99 -Wall -W -Wextra -pedantic spigot.c
gcc -std=c99 -Wall -W -Wextra -pedantic spigot.c
clang -std=c99 -Wall -W -Wextra -pedantic spigot.c
```
I've tested with gcc-4.6.3 and clang-3.0 on Linux (Ubuntu 12.04)
@@ -124,27 +124,27 @@ and gcc-4.5.3 and clang-3.1 on Cygwin.
### Synopsis
```sh
cc endoh2.c -o endoh2
cc endoh2.c -o endoh2
./endoh2 > pi.c
cat pi.c
./endoh2 > pi.c
cat pi.c
cc pi.c -o pi ; ./pi > 314.c ; cat 314.c
cc 314.c -o 314 ; ./314 > 3141.c ; cat 3141.c
cc 3141.c -o 3141 ; ./3141 > 31415.c ; cat 31415.c
cc 31415.c -o 31415 ; ./31415 > 314159.c ; cat 314159.c
cc 314159.c -o 314159 ; ./314159 > 3141592.c ; cat 3141592.c
etc...
cc pi.c -o pi ; ./pi > 314.c ; cat 314.c
cc 314.c -o 314 ; ./314 > 3141.c ; cat 3141.c
cc 3141.c -o 3141 ; ./3141 > 31415.c ; cat 31415.c
cc 31415.c -o 31415 ; ./31415 > 314159.c ; cat 314159.c
cc 314159.c -o 314159 ; ./314159 > 3141592.c ; cat 3141592.c
etc...
./endoh2 e > e.c
cat e.c
./endoh2 e > e.c
cat e.c
cc e.c -o e ; ./e > 271.c ; cat 271.c
cc 271.c -o 271 ; ./271 > 2718.c ; cat 2718.c
cc 2718.c -o 2718 ; ./2718 > 27182.c ; cat 27182.c
cc 27182.c -o 27182 ; ./27182 > 271828.c ; cat 271828.c
cc 271828.c -o 271828 ; ./271828 > 2718281.c ; cat 2718281.c
etc...
cc e.c -o e ; ./e > 271.c ; cat 271.c
cc 271.c -o 271 ; ./271 > 2718.c ; cat 2718.c
cc 2718.c -o 2718 ; ./2718 > 27182.c ; cat 27182.c
cc 27182.c -o 27182 ; ./27182 > 271828.c ; cat 271828.c
cc 271828.c -o 271828 ; ./271828 > 2718281.c ; cat 2718281.c
etc...
```
You can do `make everything` for the process (with no `cat`).
2012/endoh2/index.html
+28 -29
View File
@@ -132,8 +132,7 @@
<h2 id="author"><a name="author"></a>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>
<br><br></li>
Location: <a href="../../location.html#JP">JP</a> - <em>Japan</em></li>
</ul>
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -142,18 +141,18 @@ Location: <a href="../../location.html#JP">JP</a> - <em>Japan</em>
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
<h2 id="to-build">To build:</h2>
<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>
<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>
<h2 id="to-use">To use:</h2>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./endoh2</span> <span class="op">&gt;</span> pi.c</span>
<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a><span class="fu">gcc</span> <span class="at">-o</span> pi pi.c</span>
<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a><span class="ex">./pi</span> <span class="op">&gt;</span> 314.c</span></code></pre></div>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./endoh2</span> <span class="op">&gt;</span> pi.c</span>
<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">gcc</span> <span class="at">-o</span> pi pi.c</span>
<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">./pi</span> <span class="op">&gt;</span> 314.c</span></code></pre></div>
<p>and:</p>
<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">./endoh2</span> e <span class="op">&gt;</span> e.c<span class="dt">\</span></span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a>gcc <span class="at">-o</span> e e.c</span>
<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a><span class="ex">./e</span> <span class="op">&gt;</span> 271.c</span></code></pre></div>
<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">./endoh2</span> e <span class="op">&gt;</span> e.c<span class="dt">\</span></span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a> gcc <span class="at">-o</span> e e.c</span>
<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">./e</span> <span class="op">&gt;</span> 271.c</span></code></pre></div>
<p>…</p>
<h2 id="try">Try:</h2>
<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>
<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>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>A
<a href="https://en.wikipedia.org/wiki/Pi">pi</a>/<a href="https://en.wikipedia.org/wiki/E_(mathematical_constant)">e</a>
@@ -214,32 +213,32 @@ willy-nilly.</p>
warning, it requires two C99 features: allow string literal to be more than 509
characters and not requiring a return in <code>main()</code>. In fact, recent compilers
with <code>-std=c99 -Wall -W -Wextra -pedantic</code> would say nothing.</p>
<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">gcc</span> <span class="at">-std</span><span class="op">=</span>c99 <span class="at">-Wall</span> <span class="at">-W</span> <span class="at">-Wextra</span> <span class="at">-pedantic</span> spigot.c</span>
<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a><span class="fu">clang</span> <span class="at">-std</span><span class="op">=</span>c99 <span class="at">-Wall</span> <span class="at">-W</span> <span class="at">-Wextra</span> <span class="at">-pedantic</span> spigot.c</span></code></pre></div>
<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">gcc</span> <span class="at">-std</span><span class="op">=</span>c99 <span class="at">-Wall</span> <span class="at">-W</span> <span class="at">-Wextra</span> <span class="at">-pedantic</span> spigot.c</span>
<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">clang</span> <span class="at">-std</span><span class="op">=</span>c99 <span class="at">-Wall</span> <span class="at">-W</span> <span class="at">-Wextra</span> <span class="at">-pedantic</span> spigot.c</span></code></pre></div>
<p>I’ve tested with gcc-4.6.3 and clang-3.0 on Linux (Ubuntu 12.04)
and gcc-4.5.3 and clang-3.1 on Cygwin.</p>
<h3 id="synopsis">Synopsis</h3>
<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> endoh2.c <span class="at">-o</span> endoh2</span>
<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> endoh2.c <span class="at">-o</span> endoh2</span>
<span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb6-3"><a href="#cb6-3" aria-hidden="true" tabindex="-1"></a><span class="ex">./endoh2</span> <span class="op">&gt;</span> pi.c</span>
<span id="cb6-4"><a href="#cb6-4" aria-hidden="true" tabindex="-1"></a><span class="fu">cat</span> pi.c</span>
<span id="cb6-3"><a href="#cb6-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">./endoh2</span> <span class="op">&gt;</span> pi.c</span>
<span id="cb6-4"><a href="#cb6-4" aria-hidden="true" tabindex="-1"></a> <span class="fu">cat</span> pi.c</span>
<span id="cb6-5"><a href="#cb6-5" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb6-6"><a href="#cb6-6" aria-hidden="true" tabindex="-1"></a><span class="fu">cc</span> pi.c <span class="at">-o</span> pi <span class="kw">;</span> <span class="ex">./pi</span> <span class="op">&gt;</span> 314.c <span class="kw">;</span> <span class="fu">cat</span> 314.c</span>
<span id="cb6-7"><a href="#cb6-7" aria-hidden="true" tabindex="-1"></a><span class="fu">cc</span> 314.c <span class="at">-o</span> 314 <span class="kw">;</span> <span class="ex">./314</span> <span class="op">&gt;</span> 3141.c <span class="kw">;</span> <span class="fu">cat</span> 3141.c</span>
<span id="cb6-8"><a href="#cb6-8" aria-hidden="true" tabindex="-1"></a><span class="fu">cc</span> 3141.c <span class="at">-o</span> 3141 <span class="kw">;</span> <span class="ex">./3141</span> <span class="op">&gt;</span> 31415.c <span class="kw">;</span> <span class="fu">cat</span> 31415.c</span>
<span id="cb6-9"><a href="#cb6-9" aria-hidden="true" tabindex="-1"></a><span class="fu">cc</span> 31415.c <span class="at">-o</span> 31415 <span class="kw">;</span> <span class="ex">./31415</span> <span class="op">&gt;</span> 314159.c <span class="kw">;</span> <span class="fu">cat</span> 314159.c</span>
<span id="cb6-10"><a href="#cb6-10" aria-hidden="true" tabindex="-1"></a><span class="fu">cc</span> 314159.c <span class="at">-o</span> 314159 <span class="kw">;</span> <span class="ex">./314159</span> <span class="op">&gt;</span> 3141592.c <span class="kw">;</span> <span class="fu">cat</span> 3141592.c</span>
<span id="cb6-11"><a href="#cb6-11" aria-hidden="true" tabindex="-1"></a><span class="ex">etc...</span></span>
<span id="cb6-6"><a href="#cb6-6" aria-hidden="true" tabindex="-1"></a> <span class="fu">cc</span> pi.c <span class="at">-o</span> pi <span class="kw">;</span> <span class="ex">./pi</span> <span class="op">&gt;</span> 314.c <span class="kw">;</span> <span class="fu">cat</span> 314.c</span>
<span id="cb6-7"><a href="#cb6-7" aria-hidden="true" tabindex="-1"></a> <span class="fu">cc</span> 314.c <span class="at">-o</span> 314 <span class="kw">;</span> <span class="ex">./314</span> <span class="op">&gt;</span> 3141.c <span class="kw">;</span> <span class="fu">cat</span> 3141.c</span>
<span id="cb6-8"><a href="#cb6-8" aria-hidden="true" tabindex="-1"></a> <span class="fu">cc</span> 3141.c <span class="at">-o</span> 3141 <span class="kw">;</span> <span class="ex">./3141</span> <span class="op">&gt;</span> 31415.c <span class="kw">;</span> <span class="fu">cat</span> 31415.c</span>
<span id="cb6-9"><a href="#cb6-9" aria-hidden="true" tabindex="-1"></a> <span class="fu">cc</span> 31415.c <span class="at">-o</span> 31415 <span class="kw">;</span> <span class="ex">./31415</span> <span class="op">&gt;</span> 314159.c <span class="kw">;</span> <span class="fu">cat</span> 314159.c</span>
<span id="cb6-10"><a href="#cb6-10" aria-hidden="true" tabindex="-1"></a> <span class="fu">cc</span> 314159.c <span class="at">-o</span> 314159 <span class="kw">;</span> <span class="ex">./314159</span> <span class="op">&gt;</span> 3141592.c <span class="kw">;</span> <span class="fu">cat</span> 3141592.c</span>
<span id="cb6-11"><a href="#cb6-11" aria-hidden="true" tabindex="-1"></a> <span class="ex">etc...</span></span>
<span id="cb6-12"><a href="#cb6-12" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb6-13"><a href="#cb6-13" aria-hidden="true" tabindex="-1"></a><span class="ex">./endoh2</span> e <span class="op">&gt;</span> e.c</span>
<span id="cb6-14"><a href="#cb6-14" aria-hidden="true" tabindex="-1"></a><span class="fu">cat</span> e.c</span>
<span id="cb6-13"><a href="#cb6-13" aria-hidden="true" tabindex="-1"></a> <span class="ex">./endoh2</span> e <span class="op">&gt;</span> e.c</span>
<span id="cb6-14"><a href="#cb6-14" aria-hidden="true" tabindex="-1"></a> <span class="fu">cat</span> e.c</span>
<span id="cb6-15"><a href="#cb6-15" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb6-16"><a href="#cb6-16" aria-hidden="true" tabindex="-1"></a><span class="fu">cc</span> e.c <span class="at">-o</span> e <span class="kw">;</span> <span class="ex">./e</span> <span class="op">&gt;</span> 271.c <span class="kw">;</span> <span class="fu">cat</span> 271.c</span>
<span id="cb6-17"><a href="#cb6-17" aria-hidden="true" tabindex="-1"></a><span class="fu">cc</span> 271.c <span class="at">-o</span> 271 <span class="kw">;</span> <span class="ex">./271</span> <span class="op">&gt;</span> 2718.c <span class="kw">;</span> <span class="fu">cat</span> 2718.c</span>
<span id="cb6-18"><a href="#cb6-18" aria-hidden="true" tabindex="-1"></a><span class="fu">cc</span> 2718.c <span class="at">-o</span> 2718 <span class="kw">;</span> <span class="ex">./2718</span> <span class="op">&gt;</span> 27182.c <span class="kw">;</span> <span class="fu">cat</span> 27182.c</span>
<span id="cb6-19"><a href="#cb6-19" aria-hidden="true" tabindex="-1"></a><span class="fu">cc</span> 27182.c <span class="at">-o</span> 27182 <span class="kw">;</span> <span class="ex">./27182</span> <span class="op">&gt;</span> 271828.c <span class="kw">;</span> <span class="fu">cat</span> 271828.c</span>
<span id="cb6-20"><a href="#cb6-20" aria-hidden="true" tabindex="-1"></a><span class="fu">cc</span> 271828.c <span class="at">-o</span> 271828 <span class="kw">;</span> <span class="ex">./271828</span> <span class="op">&gt;</span> 2718281.c <span class="kw">;</span> <span class="fu">cat</span> 2718281.c</span>
<span id="cb6-21"><a href="#cb6-21" aria-hidden="true" tabindex="-1"></a><span class="ex">etc...</span></span></code></pre></div>
<span id="cb6-16"><a href="#cb6-16" aria-hidden="true" tabindex="-1"></a> <span class="fu">cc</span> e.c <span class="at">-o</span> e <span class="kw">;</span> <span class="ex">./e</span> <span class="op">&gt;</span> 271.c <span class="kw">;</span> <span class="fu">cat</span> 271.c</span>
<span id="cb6-17"><a href="#cb6-17" aria-hidden="true" tabindex="-1"></a> <span class="fu">cc</span> 271.c <span class="at">-o</span> 271 <span class="kw">;</span> <span class="ex">./271</span> <span class="op">&gt;</span> 2718.c <span class="kw">;</span> <span class="fu">cat</span> 2718.c</span>
<span id="cb6-18"><a href="#cb6-18" aria-hidden="true" tabindex="-1"></a> <span class="fu">cc</span> 2718.c <span class="at">-o</span> 2718 <span class="kw">;</span> <span class="ex">./2718</span> <span class="op">&gt;</span> 27182.c <span class="kw">;</span> <span class="fu">cat</span> 27182.c</span>
<span id="cb6-19"><a href="#cb6-19" aria-hidden="true" tabindex="-1"></a> <span class="fu">cc</span> 27182.c <span class="at">-o</span> 27182 <span class="kw">;</span> <span class="ex">./27182</span> <span class="op">&gt;</span> 271828.c <span class="kw">;</span> <span class="fu">cat</span> 271828.c</span>
<span id="cb6-20"><a href="#cb6-20" aria-hidden="true" tabindex="-1"></a> <span class="fu">cc</span> 271828.c <span class="at">-o</span> 271828 <span class="kw">;</span> <span class="ex">./271828</span> <span class="op">&gt;</span> 2718281.c <span class="kw">;</span> <span class="fu">cat</span> 2718281.c</span>
<span id="cb6-21"><a href="#cb6-21" aria-hidden="true" tabindex="-1"></a> <span class="ex">etc...</span></span></code></pre></div>
<p>You can do <code>make everything</code> for the process (with no <code>cat</code>).</p>
<p>Note: The executable may return a failure (non-zero) exit status
unless <code>-std=c99</code> option is given.</p>
2012/grothe/README.md
+12 -12
View File
@@ -1,7 +1,7 @@
## To build:
```sh
make
make
```
@@ -10,22 +10,22 @@ make
To create a shared secret shared among `M` people with `N+1` needed to reconstruct:
```sh
./grothe -secret 1-/dev/urandom 2-/dev/urandom ... \
N-/dev/urandom 1+shared1 2+shared2 ... M+sharedM
./grothe -secret 1-/dev/urandom 2-/dev/urandom ... \
N-/dev/urandom 1+shared1 2+shared2 ... M+sharedM
```
To reconstruct the original (an arbitrary combination of `N+1` or
more shared files with their proper numbers):
```sh
./grothe I-sharedI J-sharedJ K-sharedK ... +reconstructed
./grothe I-sharedI J-sharedJ K-sharedK ... +reconstructed
```
## Try:
```sh
./try.sh
./try.sh
```
@@ -76,18 +76,18 @@ To split a secret into 4 pieces of which at least 3 will be needed to get it (in
this case the cookie recipe) back:
```sh
./grothe \
-cookie_recipe.txt\
1-/dev/urandom 2-/dev/urandom\
1+cookie_piece1.dat 2+cookie_piece2.dat 3+cookie_piece3.dat 4+cookie_piece4.dat
./grothe \
-cookie_recipe.txt\
1-/dev/urandom 2-/dev/urandom\
1+cookie_piece1.dat 2+cookie_piece2.dat 3+cookie_piece3.dat 4+cookie_piece4.dat
```
To put the recipe back together using the first, second and fourth pieces:
```sh
./grothe \
1-cookie_piece1.dat 2-cookie_piece2.dat 4-cookie_piece4.dat
+cookie_recipe_restore.txt
./grothe \
1-cookie_piece1.dat 2-cookie_piece2.dat 4-cookie_piece4.dat
+cookie_recipe_restore.txt
```
2012/grothe/index.html
+13 -14
View File
@@ -135,8 +135,7 @@
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)
<br><br></li>
<li>Name: <a href="../../authors.html#David_Madore">David Madore</a><br>
Location: <a href="../../location.html#FR">FR</a> - <em>French Republic</em> (<em>France</em>)
<br><br></li>
Location: <a href="../../location.html#FR">FR</a> - <em>French Republic</em> (<em>France</em>)</li>
</ul>
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -145,16 +144,16 @@ Location: <a href="../../location.html#FR">FR</a> - <em>French Republic</em> (<e
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
<h2 id="to-build">To build:</h2>
<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>
<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>
<h2 id="to-use">To use:</h2>
<p>To create a shared secret shared among <code>M</code> people with <code>N+1</code> needed to reconstruct:</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./grothe</span> <span class="at">-secret</span> 1-/dev/urandom 2-/dev/urandom ... <span class="dt">\</span></span>
<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a> N-/dev/urandom 1+shared1 2+shared2 ... M+sharedM</span></code></pre></div>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./grothe</span> <span class="at">-secret</span> 1-/dev/urandom 2-/dev/urandom ... <span class="dt">\</span></span>
<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a> N-/dev/urandom 1+shared1 2+shared2 ... M+sharedM</span></code></pre></div>
<p>To reconstruct the original (an arbitrary combination of <code>N+1</code> or
more shared files with their proper numbers):</p>
<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">./grothe</span> I-sharedI J-sharedJ K-sharedK ... +reconstructed</span></code></pre></div>
<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">./grothe</span> I-sharedI J-sharedJ K-sharedK ... +reconstructed</span></code></pre></div>
<h2 id="try">Try:</h2>
<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>
<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>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>Also known as ‘Best abuse of the judging process’.</p>
<p>The IOCCC 2012 submission page didn’t enforce the 2048 meaningful character
@@ -185,14 +184,14 @@ into 3 parts and require two of them be available to extract the original recipe
<h3 id="example-usage">Example usage</h3>
<p>To split a secret into 4 pieces of which at least 3 will be needed to get it (in
this case the cookie recipe) back:</p>
<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="ex">./grothe</span> <span class="dt">\</span></span>
<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a> <span class="at">-cookie_recipe.txt</span><span class="dt">\</span></span>
<span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a> 1-/dev/urandom 2-/dev/urandom<span class="dt">\</span></span>
<span id="cb5-4"><a href="#cb5-4" aria-hidden="true" tabindex="-1"></a> 1+cookie_piece1.dat 2+cookie_piece2.dat 3+cookie_piece3.dat 4+cookie_piece4.dat</span></code></pre></div>
<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="ex">./grothe</span> <span class="dt">\</span></span>
<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a> <span class="at">-cookie_recipe.txt</span><span class="dt">\</span></span>
<span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a> 1-/dev/urandom 2-/dev/urandom<span class="dt">\</span></span>
<span id="cb5-4"><a href="#cb5-4" aria-hidden="true" tabindex="-1"></a> 1+cookie_piece1.dat 2+cookie_piece2.dat 3+cookie_piece3.dat 4+cookie_piece4.dat</span></code></pre></div>
<p>To put the recipe back together using the first, second and fourth pieces:</p>
<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="ex">./grothe</span> <span class="dt">\</span></span>
<span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a> 1-cookie_piece1.dat 2-cookie_piece2.dat 4-cookie_piece4.dat</span>
<span id="cb6-3"><a href="#cb6-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">+cookie_recipe_restore.txt</span></span></code></pre></div>
<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="ex">./grothe</span> <span class="dt">\</span></span>
<span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a> 1-cookie_piece1.dat 2-cookie_piece2.dat 4-cookie_piece4.dat</span>
<span id="cb6-3"><a href="#cb6-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">+cookie_recipe_restore.txt</span></span></code></pre></div>
<h3 id="limitations">Limitations</h3>
<p>The program is limited to 256 input and output files and will slow down
dramatically when you get past 20-50 inputs and outputs.</p>
2012/hamano/README.md
+10 -10
View File
@@ -1,21 +1,21 @@
## To build:
```sh
make
make
```
## To use:
```sh
./hamano < textfile > output.pdf
./hamano < textfile > output.pdf
```
## Try:
```sh
./try.sh
./try.sh
```
The script will generate a number of PDF files and it will suggest you look at
@@ -31,9 +31,9 @@ README.md!
That procedure looks like:
```sh
./hamano < README.md > hint.pdf
cc -xc hint.pdf -o hint
./hint
./hamano < README.md > hint.pdf
cc -xc hint.pdf -o hint
./hint
```
Another PDF generated is an obfuscated `Hello World!` program (obfuscated inside
@@ -41,11 +41,11 @@ the PDF). Once this is done it will compile the PDF as if it was C (itself!). It
will look like:
```sh
echo 'int main(){puts("Hello World!");}' | ./hamano > hello.pdf
cc -xc hello.pdf -o hello
./hello | cc -Wno-implicit-function-declaration -xc - -o ./hello2
echo 'int main(){puts("Hello World!");}' | ./hamano > hello.pdf
cc -xc hello.pdf -o hello
./hello | cc -Wno-implicit-function-declaration -xc - -o ./hello2
./hello2
./hello2
```
although the `CFLAGS` will be what is in the Makefile as it uses the helper
2012/hamano/index.html
+11 -12
View File
@@ -132,8 +132,7 @@
<h2 id="author"><a name="author"></a>Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Tsukasa_Hamano">Tsukasa Hamano</a><br>
Location: <a href="../../location.html#JP">JP</a> - <em>Japan</em>
<br><br></li>
Location: <a href="../../location.html#JP">JP</a> - <em>Japan</em></li>
</ul>
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -142,11 +141,11 @@ Location: <a href="../../location.html#JP">JP</a> - <em>Japan</em>
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
<h2 id="to-build">To build:</h2>
<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>
<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>
<h2 id="to-use">To use:</h2>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./hamano</span> <span class="op">&lt;</span> textfile <span class="op">&gt;</span> output.pdf</span></code></pre></div>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./hamano</span> <span class="op">&lt;</span> textfile <span class="op">&gt;</span> output.pdf</span></code></pre></div>
<h2 id="try">Try:</h2>
<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">./try.sh</span></span></code></pre></div>
<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">./try.sh</span></span></code></pre></div>
<p>The script will generate a number of PDF files and it will suggest you look at
them as well. You can read <code>hint.pdf</code> with a PDF reader like <code>acroread hint.pdf</code>
or <code>evince hint.pdf</code>. With macOS you can do <code>open hint.pdf</code> which by default
@@ -156,17 +155,17 @@ directly instead.</p>
the PDF file will then be compiled as C (itself!) and executed so that it shows
README.md!</p>
<p>That procedure looks like:</p>
<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">./hamano</span> <span class="op">&lt;</span> README.md <span class="op">&gt;</span> hint.pdf</span>
<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a><span class="fu">cc</span> <span class="at">-xc</span> hint.pdf <span class="at">-o</span> hint</span>
<span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a><span class="ex">./hint</span></span></code></pre></div>
<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">./hamano</span> <span class="op">&lt;</span> README.md <span class="op">&gt;</span> hint.pdf</span>
<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">cc</span> <span class="at">-xc</span> hint.pdf <span class="at">-o</span> hint</span>
<span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">./hint</span></span></code></pre></div>
<p>Another PDF generated is an obfuscated <code>Hello World!</code> program (obfuscated inside
the PDF). Once this is done it will compile the PDF as if it was C (itself!). It
will look like:</p>
<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="bu">echo</span> <span class="st">&#39;int main(){puts(&quot;Hello World!&quot;);}&#39;</span> <span class="kw">|</span> <span class="ex">./hamano</span> <span class="op">&gt;</span> hello.pdf</span>
<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a><span class="fu">cc</span> <span class="at">-xc</span> hello.pdf <span class="at">-o</span> hello</span>
<span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a><span class="ex">./hello</span> <span class="kw">|</span> <span class="fu">cc</span> <span class="at">-Wno-implicit-function-declaration</span> <span class="at">-xc</span> <span class="at">-</span> <span class="at">-o</span> ./hello2</span>
<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="bu">echo</span> <span class="st">&#39;int main(){puts(&quot;Hello World!&quot;);}&#39;</span> <span class="kw">|</span> <span class="ex">./hamano</span> <span class="op">&gt;</span> hello.pdf</span>
<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">cc</span> <span class="at">-xc</span> hello.pdf <span class="at">-o</span> hello</span>
<span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">./hello</span> <span class="kw">|</span> <span class="fu">cc</span> <span class="at">-Wno-implicit-function-declaration</span> <span class="at">-xc</span> <span class="at">-</span> <span class="at">-o</span> ./hello2</span>
<span id="cb5-4"><a href="#cb5-4" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb5-5"><a href="#cb5-5" aria-hidden="true" tabindex="-1"></a><span class="ex">./hello2</span></span></code></pre></div>
<span id="cb5-5"><a href="#cb5-5" aria-hidden="true" tabindex="-1"></a> <span class="ex">./hello2</span></span></code></pre></div>
<p>although the <code>CFLAGS</code> will be what is in the Makefile as it uses the helper
rules <code>hint.pdf</code>, <code>hint</code>, <code>hello.pdf</code> and <code>hello</code> to do this.</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
2012/hou/README.md
+11 -11
View File
@@ -1,21 +1,21 @@
## To build:
```sh
make
make
```
## To use:
```sh
./hou syntax-file file-to-process
./hou syntax-file file-to-process
```
## Try:
```sh
./try.sh
./try.sh
```
View the `remarks.htm` file in your web browser.
@@ -26,9 +26,9 @@ The result is best viewed in a 80x25 console with ANSI colors.
## Try (Windows):
```
copy header.htm hou.htm /y
hou html.txt hou.c >> hou.htm
start hou.htm
copy header.htm hou.htm /y
hou html.txt hou.c >> hou.htm
start hou.htm
```
@@ -74,15 +74,15 @@ in the regular expression by escaping it with `[]` or `""`.
The following regular expression operators are supported:
```
() [] * + ? | ""
() [] * + ? | ""
```
For example, one can use the following expression to match a certain declaration
statement in [hou.c](hou.c):
```re
"char"[ *]*[a-zA-Z_][0-9a-zA-Z_]*[ ]*((=[0-9a-zA-Z_ ]+)|(\[[0-9a-zA-Z_ ]*\]))?[ ]*(,[ *]*[a-zA-Z_][0-9a-zA-Z_]*[ ]*((=[0-9a-zA-Z_ ]+)|(\[[0-9a-zA-Z_ ]*\]))?[ ]*)*;
```
"char"[ *]*[a-zA-Z_][0-9a-zA-Z_]*[ ]*((=[0-9a-zA-Z_ ]+)|(\[[0-9a-zA-Z_ ]*\]))?[ ]*(,[ *]*[a-zA-Z_][0-9a-zA-Z_]*[ ]*((=[0-9a-zA-Z_ ]+)|(\[[0-9a-zA-Z_ ]*\]))?[ ]*)*;
```
The regex engine is also algorithmically efficient. To illustrate the point,
[ansi.txt](ansi.txt) contains a pathological expression [^2] that guarantees a
@@ -90,8 +90,8 @@ hang for the competing Perl engine while matching itself. Try to compare these
two engines:
```sh
./hou ansi.txt ansi.txt
perl patho.pl < ansi.txt
./hou ansi.txt ansi.txt
perl patho.pl < ansi.txt
```
2012/hou/hint.html
+17 -14
View File
@@ -124,20 +124,23 @@
<h2 id="judges-comments">Judges’ comments:</h2>
<h3 id="to-build">To build:</h3>
<p>make hou</p>
<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> hou</span></code></pre></div>
<h3 id="to-run">To run:</h3>
<p>./hou syntax-file file-to-process</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./hou</span> syntax-file file-to-process</span></code></pre></div>
<h3 id="try-unix">Try (Unix):</h3>
<p>The results are best viewed in a 80x25 console with ANSI colors.</p>
<p>less hou.c</p>
<p>./hou ansi.txt hou.c | less -r</p>
<p>./hou chk.txt hou.c | wc</p>
<p>./hou markdown.txt remarks.markdown &gt; remarks.htm
your-browser remarks.htm</p>
<pre><code> less hou.c
./hou ansi.txt hou.c | less -r
./hou chk.txt hou.c | wc
./hou markdown.txt remarks.markdown &gt; remarks.htm
your-browser remarks.htm</code></pre>
<h3 id="try-windows">Try (Windows):</h3>
<p>copy header.htm hou.htm /y
hou html.txt hou.c &gt;&gt; hou.htm
start hou.htm</p>
<pre><code> copy header.htm hou.htm /y
hou html.txt hou.c &gt;&gt; hou.htm
start hou.htm</code></pre>
<h3 id="selected-judges-remarks">Selected Judges Remarks:</h3>
<p>What a versatile entry! It can be used to check the size of IOCCC entries <em>and</em> to publish them as HTML.</p>
<p>For extra credit: what is the meaning of the number 2321237?</p>
@@ -165,14 +168,14 @@ original text in the format string using “%s”. Other “%” characters in t
format string must be escaped with another “%”. The space character can be used
in the regular expression by escaping it with [] or ““.</p>
<p>The following regular expression operators are supported:</p>
<p>() [] * + ? | “”</p>
<pre><code> () [] * + ? | &quot;&quot;</code></pre>
<p>For example, one can use the following expression to match a certain declaration statement in hou.c:</p>
<p>“char”[ *]<em>[a-zA-Z_][0-9a-zA-Z_]</em>[ ]<em>((=[0-9a-zA-Z_ ]+)|([[0-9a-zA-Z_ ]</em>]))?[ ]<em>(,[ *]</em>[a-zA-Z_][0-9a-zA-Z_]<em>[ ]</em>((=[0-9a-zA-Z_ ]+)|([[0-9a-zA-Z_ ]<em>]))?[ ]</em>)*;</p>
<div class="sourceCode" id="cb6"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a> <span class="st">&quot;char&quot;</span><span class="op">[</span> <span class="op">*]*[</span>a<span class="op">-</span>zA<span class="op">-</span>Z_<span class="op">][</span><span class="dv">0</span><span class="op">-</span><span class="dv">9</span><span class="er">a</span><span class="op">-</span>zA<span class="op">-</span>Z_<span class="op">]*[</span> <span class="op">]*((=[</span><span class="dv">0</span><span class="op">-</span><span class="dv">9</span><span class="er">a</span><span class="op">-</span>zA<span class="op">-</span>Z_ <span class="op">]+)|(</span>\<span class="op">[[</span><span class="dv">0</span><span class="op">-</span><span class="dv">9</span><span class="er">a</span><span class="op">-</span><span class="at">zA</span><span class="op">-</span><span class="at">Z_ </span><span class="op">]*</span><span class="at">\</span><span class="op">]))?[</span><span class="at"> </span><span class="op">]*(,[</span><span class="at"> </span><span class="op">*]*[</span><span class="at">a</span><span class="op">-</span><span class="at">zA</span><span class="op">-</span><span class="at">Z_</span><span class="op">][</span><span class="dv">0</span><span class="op">-</span><span class="dv">9</span><span class="er">a</span><span class="op">-</span><span class="at">zA</span><span class="op">-</span><span class="at">Z_</span><span class="op">]*[</span><span class="at"> </span><span class="op">]*((=[</span><span class="dv">0</span><span class="op">-</span><span class="dv">9</span><span class="er">a</span><span class="op">-</span><span class="at">zA</span><span class="op">-</span><span class="at">Z_ </span><span class="op">]+)|(</span><span class="at">\</span><span class="op">[[</span><span class="dv">0</span><span class="op">-</span><span class="dv">9</span><span class="er">a</span><span class="op">-</span><span class="at">zA</span><span class="op">-</span><span class="at">Z_ </span><span class="op">]*</span><span class="at">\</span><span class="op">]))?[</span><span class="at"> </span><span class="op">]*)*;</span></span></code></pre></div>
<p>The regex engine is also algorithmically efficient. To illustrate the point,
ansi.txt contains a pathological expression [2] that guarantees a hang for the
competing Perl engine while matching itself. Try to compare these two engines:</p>
<p>./hou ansi.txt ansi.txt
perl patho.pl &lt; ansi.txt</p>
<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">./hou</span> ansi.txt ansi.txt</span>
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">perl</span> patho.pl <span class="op">&lt;</span> ansi.txt</span></code></pre></div>
<p>Finally, there are a few limitations…</p>
<ul>
<li>The only escape sequence supported is and it doesn’t work in [].</li>
2012/hou/hint.md
+14
View File
@@ -2,16 +2,21 @@
### To build:
```sh
make hou
```
### To run:
```sh
./hou syntax-file file-to-process
```
### Try (Unix):
The results are best viewed in a 80x25 console with ANSI colors.
```
less hou.c
./hou ansi.txt hou.c | less -r
@@ -20,12 +25,15 @@ The results are best viewed in a 80x25 console with ANSI colors.
./hou markdown.txt remarks.markdown > remarks.htm
your-browser remarks.htm
```
### Try (Windows):
```
copy header.htm hou.htm /y
hou html.txt hou.c >> hou.htm
start hou.htm
```
### Selected Judges Remarks:
@@ -67,18 +75,24 @@ in the regular expression by escaping it with [] or "".
The following regular expression operators are supported:
```
() [] * + ? | ""
```
For example, one can use the following expression to match a certain declaration statement in hou.c:
```c
"char"[ *]*[a-zA-Z_][0-9a-zA-Z_]*[ ]*((=[0-9a-zA-Z_ ]+)|(\[[0-9a-zA-Z_ ]*\]))?[ ]*(,[ *]*[a-zA-Z_][0-9a-zA-Z_]*[ ]*((=[0-9a-zA-Z_ ]+)|(\[[0-9a-zA-Z_ ]*\]))?[ ]*)*;
```
The regex engine is also algorithmically efficient. To illustrate the point,
ansi.txt contains a pathological expression [2] that guarantees a hang for the
competing Perl engine while matching itself. Try to compare these two engines:
```sh
./hou ansi.txt ansi.txt
perl patho.pl < ansi.txt
```
Finally, there are a few limitations...
2012/hou/index.html
+11 -12
View File
@@ -132,8 +132,7 @@
<h2 id="author"><a name="author"></a>Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Qiming_HOU">Qiming HOU</a><br>
Location: <a href="../../location.html#CN">CN</a> - <em>People’s Republic of China</em> (<em>China</em>)
<br><br></li>
Location: <a href="../../location.html#CN">CN</a> - <em>People’s Republic of China</em> (<em>China</em>)</li>
</ul>
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -142,17 +141,17 @@ Location: <a href="../../location.html#CN">CN</a> - <em>People’s Republic of C
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
<h2 id="to-build">To build:</h2>
<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>
<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>
<h2 id="to-use">To use:</h2>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./hou</span> syntax-file file-to-process</span></code></pre></div>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./hou</span> syntax-file file-to-process</span></code></pre></div>
<h2 id="try">Try:</h2>
<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">./try.sh</span></span></code></pre></div>
<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">./try.sh</span></span></code></pre></div>
<p>View the <code>remarks.htm</code> file in your web browser.</p>
<p>The result is best viewed in a 80x25 console with ANSI colors.</p>
<h2 id="try-windows">Try (Windows):</h2>
<pre><code>copy header.htm hou.htm /y
hou html.txt hou.c &gt;&gt; hou.htm
start hou.htm</code></pre>
<pre><code> copy header.htm hou.htm /y
hou html.txt hou.c &gt;&gt; hou.htm
start hou.htm</code></pre>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>What a versatile entry! It can be used to check the size of IOCCC entries <em>and</em>
to publish them as HTML.</p>
@@ -181,16 +180,16 @@ original text in the format string using <code>%s</code>. Other <code>%</code> c
format string must be escaped with another <code>%</code>. The space character can be used
in the regular expression by escaping it with <code>[]</code> or <code>""</code>.</p>
<p>The following regular expression operators are supported:</p>
<pre><code>() [] * + ? | &quot;&quot;</code></pre>
<pre><code> () [] * + ? | &quot;&quot;</code></pre>
<p>For example, one can use the following expression to match a certain declaration
statement in <a href="hou.c">hou.c</a>:</p>
<pre class="re"><code> &quot;char&quot;[ *]*[a-zA-Z_][0-9a-zA-Z_]*[ ]*((=[0-9a-zA-Z_ ]+)|(\[[0-9a-zA-Z_ ]*\]))?[ ]*(,[ *]*[a-zA-Z_][0-9a-zA-Z_]*[ ]*((=[0-9a-zA-Z_ ]+)|(\[[0-9a-zA-Z_ ]*\]))?[ ]*)*;</code></pre>
<pre class="re"><code> &quot;char&quot;[ *]*[a-zA-Z_][0-9a-zA-Z_]*[ ]*((=[0-9a-zA-Z_ ]+)|(\[[0-9a-zA-Z_ ]*\]))?[ ]*(,[ *]*[a-zA-Z_][0-9a-zA-Z_]*[ ]*((=[0-9a-zA-Z_ ]+)|(\[[0-9a-zA-Z_ ]*\]))?[ ]*)*;</code></pre>
<p>The regex engine is also algorithmically efficient. To illustrate the point,
<a href="ansi.txt">ansi.txt</a> contains a pathological expression <a href="#fn1" class="footnote-ref" id="fnref1" role="doc-noteref"><sup>1</sup></a> that guarantees a
hang for the competing Perl engine while matching itself. Try to compare these
two engines:</p>
<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">./hou</span> ansi.txt ansi.txt</span>
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a><span class="fu">perl</span> patho.pl <span class="op">&lt;</span> ansi.txt</span></code></pre></div>
<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">./hou</span> ansi.txt ansi.txt</span>
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">perl</span> patho.pl <span class="op">&lt;</span> ansi.txt</span></code></pre></div>
<h3 id="limitations">Limitations</h3>
<p>Finally, there are a few limitations…</p>
<ul>
2012/kang/README.md
+22 -22
View File
@@ -1,7 +1,7 @@
## To build:
```sh
make
make
```
There is alternate code which fixes some German at the expense of other German.
@@ -11,18 +11,18 @@ See [Alternate code](#alternate-code) below for the (fun) rationale here.
## To use:
```sh
echo "full spelling of an English cardinal numeral less than a quadrillion" | ./kang
echo "full spelling of an English cardinal numeral less than a quadrillion" | ./kang
```
## Try:
```sh
./try.sh # try various languages
./try.sh # try various languages
./en.sh # English 0 through 13
./en.sh # English 0 through 13
./de.sh # German 0 through 13 with both umlauts and without (additional 'e')
./de.sh # German 0 through 13 with both umlauts and without (additional 'e')
```
How does it have no `u` or `o` in a string in the source code and yet it gets
@@ -44,29 +44,29 @@ subtlety of this entry even more.
### Alternate build:
```sh
make alt
make alt
```
### Alternate use:
```sh
echo "full spelling of an English cardinal numeral less than a quadrillion" | ./kang.alt
echo "full spelling of an English cardinal numeral less than a quadrillion" | ./kang.alt
echo vier | ./kang.alt
echo vier | ./kang.alt
echo uno | ./kang.alt
echo uno | ./kang.alt
```
### Alternate try:
```sh
./try.alt.sh # try various languages
./try.alt.sh # try various languages
./en.alt.sh # English 0 through 13
./en.alt.sh # English 0 through 13
./de.alt.sh # German 0 through 13 with both umlauts and without (additional 'e')
./de.alt.sh # German 0 through 13 with both umlauts and without (additional 'e')
```
What does it get right? What does it get wrong? How does it compare to the
@@ -89,13 +89,13 @@ We've added a linefeed to the print format for convenience.
Can you explain why:
```sh
echo f hundr|./kang
echo f hundr|./kang
```
correctly reports 500 but:
```sh
echo hundr|./kang
echo hundr|./kang
```
does not report 100, instead printing 0?
@@ -184,19 +184,19 @@ But the most important obfuscation is the clever construction of lookup table.
The program uses 11 different characters required for recognizing 22 lexemes:
```
zero one tw- th(i)r- fo(u)r- fi- six-
seven- eigh- nin- ten eleven twelve
hundred(s) thousand(s) million(s) billion(s) trillion(s)
a and -teen -ty
zero one tw- th(i)r- fo(u)r- fi- six-
seven- eigh- nin- ten eleven twelve
hundred(s) thousand(s) million(s) billion(s) trillion(s)
a and -teen -ty
```
So that they are internally represented as like:
```
r n tw- tr- fr- f- s-
sn- g- nn- tn ln twl
nr(s) tsan(s) lln(s) blln(s) trlln(s)
a an -tn -ty
r n tw- tr- fr- f- s-
sn- g- nn- tn ln twl
nr(s) tsan(s) lln(s) blln(s) trlln(s)
a an -tn -ty
```
The stemmer recognizes the longest matching prefix, so every lexeme can be
2012/kang/index.html
+23 -24
View File
@@ -132,8 +132,7 @@
<h2 id="author"><a name="author"></a>Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Seonghoon_Kang">Seonghoon Kang</a><br>
Location: <a href="../../location.html#KR">KR</a> - <em>Republic of Korea</em> (<em>South Korea</em>)
<br><br></li>
Location: <a href="../../location.html#KR">KR</a> - <em>Republic of Korea</em> (<em>South Korea</em>)</li>
</ul>
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -142,17 +141,17 @@ Location: <a href="../../location.html#KR">KR</a> - <em>Republic of Korea</em> (
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
<h2 id="to-build">To build:</h2>
<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>
<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>
<p>There is alternate code which fixes some German at the expense of other German.
See <a href="#alternate-code">Alternate code</a> below for the (fun) rationale here.</p>
<h2 id="to-use">To use:</h2>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="bu">echo</span> <span class="st">&quot;full spelling of an English cardinal numeral less than a quadrillion&quot;</span> <span class="kw">|</span> <span class="ex">./kang</span></span></code></pre></div>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a> <span class="bu">echo</span> <span class="st">&quot;full spelling of an English cardinal numeral less than a quadrillion&quot;</span> <span class="kw">|</span> <span class="ex">./kang</span></span></code></pre></div>
<h2 id="try">Try:</h2>
<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">./try.sh</span> <span class="co"># try various languages</span></span>
<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">./try.sh</span> <span class="co"># try various languages</span></span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a><span class="ex">./en.sh</span> <span class="co"># English 0 through 13</span></span>
<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">./en.sh</span> <span class="co"># English 0 through 13</span></span>
<span id="cb3-4"><a href="#cb3-4" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb3-5"><a href="#cb3-5" aria-hidden="true" tabindex="-1"></a><span class="ex">./de.sh</span> <span class="co"># German 0 through 13 with both umlauts and without (additional &#39;e&#39;)</span></span></code></pre></div>
<span id="cb3-5"><a href="#cb3-5" aria-hidden="true" tabindex="-1"></a> <span class="ex">./de.sh</span> <span class="co"># German 0 through 13 with both umlauts and without (additional &#39;e&#39;)</span></span></code></pre></div>
<p>How does it have no <code>u</code> or <code>o</code> in a string in the source code and yet it gets
<code>uno</code> right?</p>
<h2 id="alternate-code">Alternate code:</h2>
@@ -165,19 +164,19 @@ deal with it :-) It also breaks other words too and this happens only for one
letter change. With this one should hopefully be able to really appreciate the
subtlety of this entry even more.</p>
<h3 id="alternate-build">Alternate build:</h3>
<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="fu">make</span> alt</span></code></pre></div>
<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="fu">make</span> alt</span></code></pre></div>
<h3 id="alternate-use">Alternate use:</h3>
<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="bu">echo</span> <span class="st">&quot;full spelling of an English cardinal numeral less than a quadrillion&quot;</span> <span class="kw">|</span> <span class="ex">./kang.alt</span></span>
<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="bu">echo</span> <span class="st">&quot;full spelling of an English cardinal numeral less than a quadrillion&quot;</span> <span class="kw">|</span> <span class="ex">./kang.alt</span></span>
<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a><span class="bu">echo</span> vier <span class="kw">|</span> <span class="ex">./kang.alt</span></span>
<span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a> <span class="bu">echo</span> vier <span class="kw">|</span> <span class="ex">./kang.alt</span></span>
<span id="cb5-4"><a href="#cb5-4" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb5-5"><a href="#cb5-5" aria-hidden="true" tabindex="-1"></a><span class="bu">echo</span> uno <span class="kw">|</span> <span class="ex">./kang.alt</span></span></code></pre></div>
<span id="cb5-5"><a href="#cb5-5" aria-hidden="true" tabindex="-1"></a> <span class="bu">echo</span> uno <span class="kw">|</span> <span class="ex">./kang.alt</span></span></code></pre></div>
<h3 id="alternate-try">Alternate try:</h3>
<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="ex">./try.alt.sh</span> <span class="co"># try various languages</span></span>
<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="ex">./try.alt.sh</span> <span class="co"># try various languages</span></span>
<span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb6-3"><a href="#cb6-3" aria-hidden="true" tabindex="-1"></a><span class="ex">./en.alt.sh</span> <span class="co"># English 0 through 13</span></span>
<span id="cb6-3"><a href="#cb6-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">./en.alt.sh</span> <span class="co"># English 0 through 13</span></span>
<span id="cb6-4"><a href="#cb6-4" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb6-5"><a href="#cb6-5" aria-hidden="true" tabindex="-1"></a><span class="ex">./de.alt.sh</span> <span class="co"># German 0 through 13 with both umlauts and without (additional &#39;e&#39;)</span></span></code></pre></div>
<span id="cb6-5"><a href="#cb6-5" aria-hidden="true" tabindex="-1"></a> <span class="ex">./de.alt.sh</span> <span class="co"># German 0 through 13 with both umlauts and without (additional &#39;e&#39;)</span></span></code></pre></div>
<p>What does it get right? What does it get wrong? How does it compare to the
original entry without the change of <code>f</code> to <code>v</code>?</p>
<p>Finally why does it get wrong what it gets wrong?</p>
@@ -189,9 +188,9 @@ German, Italian, Russian, and Spanish numerals.</p>
colloquial year numbers of the last millennium.</p>
<p>We’ve added a linefeed to the print format for convenience.</p>
<p>Can you explain why:</p>
<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="bu">echo</span> f hundr<span class="kw">|</span><span class="ex">./kang</span></span></code></pre></div>
<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="bu">echo</span> f hundr<span class="kw">|</span><span class="ex">./kang</span></span></code></pre></div>
<p>correctly reports 500 but:</p>
<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="bu">echo</span> hundr<span class="kw">|</span><span class="ex">./kang</span></span></code></pre></div>
<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="bu">echo</span> hundr<span class="kw">|</span><span class="ex">./kang</span></span></code></pre></div>
<p>does not report 100, instead printing 0?</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<h3 id="synopsis">Synopsis</h3>
@@ -261,15 +260,15 @@ including the final NUL character are used.</li>
</ul>
<p>But the most important obfuscation is the clever construction of lookup table.
The program uses 11 different characters required for recognizing 22 lexemes:</p>
<pre><code>zero one tw- th(i)r- fo(u)r- fi- six-
seven- eigh- nin- ten eleven twelve
hundred(s) thousand(s) million(s) billion(s) trillion(s)
a and -teen -ty</code></pre>
<pre><code> zero one tw- th(i)r- fo(u)r- fi- six-
seven- eigh- nin- ten eleven twelve
hundred(s) thousand(s) million(s) billion(s) trillion(s)
a and -teen -ty</code></pre>
<p>So that they are internally represented as like:</p>
<pre><code>r n tw- tr- fr- f- s-
sn- g- nn- tn ln twl
nr(s) tsan(s) lln(s) blln(s) trlln(s)
a an -tn -ty</code></pre>
<pre><code> r n tw- tr- fr- f- s-
sn- g- nn- tn ln twl
nr(s) tsan(s) lln(s) blln(s) trlln(s)
a an -tn -ty</code></pre>
<p>The stemmer recognizes the longest matching prefix, so every lexeme can be
recognized by at most three characters (e.g. <code>trl</code> instead of <code>trlln</code>). This is
also handy for ignoring plurals. But that would make it so that the table does not fit
2012/konno/README.md
+13 -13
View File
@@ -1,7 +1,7 @@
## To build:
```sh
make
make
```
There is an unobfuscated version of this entry. See [Alternate
@@ -11,17 +11,17 @@ code](#alternate-code) below.
## To use:
```sh
./konno N
./konno N
```
## Try:
```sh
./try.sh
./try.sh
# you can also specify numbers to try before the random and preselected ones:
./try.sh 111 222 333 444 555 666 777 888 999
# you can also specify numbers to try before the random and preselected ones:
./try.sh 111 222 333 444 555 666 777 888 999
```
Try running [try.sh](try.sh) a number of times as the first part randomly
@@ -37,7 +37,7 @@ This alternate code is an unobfuscated version of the winning code.
### Alternate build:
```sh
make alt
make alt
```
@@ -65,11 +65,11 @@ patterns.
Try:
```sh
./konno 30
./konno 90
./konno 102
./konno 109
./konno 165
./konno 30
./konno 90
./konno 102
./konno 109
./konno 165
```
There are 256 (from 0 through 255) possible rules.
@@ -80,13 +80,13 @@ There are 256 (from 0 through 255) possible rules.
This program uses bit operations. I think
```c
7&O<<!o>>!o+29
7&O<<!o>>!o+29
```
is an interesting operation. This isn't equal to
```c
7&O>>29
7&O>>29
```
operation. What is the operation doing?
2012/konno/index.html
+14 -15
View File
@@ -132,8 +132,7 @@
<h2 id="author"><a name="author"></a>Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Taketo_Konno">Taketo Konno</a><br>
Location: <a href="../../location.html#JP">JP</a> - <em>Japan</em>
<br><br></li>
Location: <a href="../../location.html#JP">JP</a> - <em>Japan</em></li>
</ul>
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -142,23 +141,23 @@ Location: <a href="../../location.html#JP">JP</a> - <em>Japan</em>
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
<h2 id="to-build">To build:</h2>
<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>
<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>
<p>There is an unobfuscated version of this entry. See <a href="#alternate-code">Alternate
code</a> below.</p>
<h2 id="to-use">To use:</h2>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./konno</span> N</span></code></pre></div>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./konno</span> N</span></code></pre></div>
<h2 id="try">Try:</h2>
<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">./try.sh</span></span>
<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">./try.sh</span></span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a><span class="co"># you can also specify numbers to try before the random and preselected ones:</span></span>
<span id="cb3-4"><a href="#cb3-4" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.sh</span> 111 222 333 444 555 666 777 888 999</span></code></pre></div>
<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a> <span class="co"># you can also specify numbers to try before the random and preselected ones:</span></span>
<span id="cb3-4"><a href="#cb3-4" aria-hidden="true" tabindex="-1"></a> <span class="ex">./try.sh</span> 111 222 333 444 555 666 777 888 999</span></code></pre></div>
<p>Try running <a href="try.sh">try.sh</a> a number of times as the first part randomly
selects ten numbers to try.</p>
<h2 id="alternate-code">Alternate code:</h2>
<p>An alternate version of this entry, <a href="konno.alt.c">konno.alt.c</a>, is provided.
This alternate code is an unobfuscated version of the winning code.</p>
<h3 id="alternate-build">Alternate build:</h3>
<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="fu">make</span> alt</span></code></pre></div>
<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="fu">make</span> alt</span></code></pre></div>
<h3 id="alternate-use">Alternate use:</h3>
<p>Use <code>konno.alt</code> as you would <code>konno</code> above.</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
@@ -171,17 +170,17 @@ This alternate code is an unobfuscated version of the winning code.</p>
automaton</a>
patterns.</p>
<p>Try:</p>
<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="ex">./konno</span> 30</span>
<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a><span class="ex">./konno</span> 90</span>
<span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a><span class="ex">./konno</span> 102</span>
<span id="cb5-4"><a href="#cb5-4" aria-hidden="true" tabindex="-1"></a><span class="ex">./konno</span> 109</span>
<span id="cb5-5"><a href="#cb5-5" aria-hidden="true" tabindex="-1"></a><span class="ex">./konno</span> 165</span></code></pre></div>
<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="ex">./konno</span> 30</span>
<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">./konno</span> 90</span>
<span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">./konno</span> 102</span>
<span id="cb5-4"><a href="#cb5-4" aria-hidden="true" tabindex="-1"></a> <span class="ex">./konno</span> 109</span>
<span id="cb5-5"><a href="#cb5-5" aria-hidden="true" tabindex="-1"></a> <span class="ex">./konno</span> 165</span></code></pre></div>
<p>There are 256 (from 0 through 255) possible rules.</p>
<h3 id="obfuscation">Obfuscation</h3>
<p>This program uses bit operations. I think</p>
<div class="sourceCode" id="cb6"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="dv">7</span><span class="op">&amp;</span>O<span class="op">&lt;&lt;!</span>o<span class="op">&gt;&gt;!</span>o<span class="op">+</span><span class="dv">29</span></span></code></pre></div>
<div class="sourceCode" id="cb6"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a> <span class="dv">7</span><span class="op">&amp;</span>O<span class="op">&lt;&lt;!</span>o<span class="op">&gt;&gt;!</span>o<span class="op">+</span><span class="dv">29</span></span></code></pre></div>
<p>is an interesting operation. This isn’t equal to</p>
<div class="sourceCode" id="cb7"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="dv">7</span><span class="op">&amp;</span>O<span class="op">&gt;&gt;</span><span class="dv">29</span></span></code></pre></div>
<div class="sourceCode" id="cb7"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a> <span class="dv">7</span><span class="op">&amp;</span>O<span class="op">&gt;&gt;</span><span class="dv">29</span></span></code></pre></div>
<p>operation. What is the operation doing?</p>
<h3 id="limitation">Limitation</h3>
<p>This program assumes that the size of <code>int</code> is 4.</p>
2012/omoikane/README.md
+19 -19
View File
@@ -1,7 +1,7 @@
## To build:
```sh
make
make
```
There is an alternate version that will read from the compiled file itself, in
@@ -13,14 +13,14 @@ theoretically work with Windows which distinguishes binary and text. See
## To use:
```sh
./nyaruko [seed.txt] < original.bin > output.c
bash output.c > key.c
perl output.c > data.c
./nyaruko [seed.txt] < original.bin > output.c
bash output.c > key.c
perl output.c > data.c
cat key.c data.c > output.c
cat key.c data.c > output.c
cc output.c -o output
./output > regenerated.bin
cc output.c -o output
./output > regenerated.bin
```
NOTE: if your OS does not have `/dev/urandom` then you should specify a seed
@@ -31,7 +31,7 @@ binary itself.
## Try:
```sh
./try.sh
./try.sh
```
The script [try.sh](try.sh) will check if you have perl before trying to use the
@@ -54,13 +54,13 @@ For the first version:
```sh
make alt
make alt
```
For the second version:
```sh
make alt2
make alt2
```
@@ -74,7 +74,7 @@ Use `nyaruko.alt` or `nyaruko.alt2` as you would `nyaruko` above.
For the first alternate version:
```sh
./try.alt.sh
./try.alt.sh
```
We have no way to test the second version, sorry (tm Canada :-) )!
@@ -94,17 +94,17 @@ The judges have nothing to add that has not already been written about in the
`Nyaruko` will produce C code that reproduces this input on `stdout`:
```sh
./nyaruko < original.bin > output.c
gcc output.c -o output
./output > regenerated.bin
./nyaruko < original.bin > output.c
gcc output.c -o output
./output > regenerated.bin
```
Output is encrypted, but both key and data are included in the output.
To separate the key from the data, run these commands:
```sh
bash output.c > key.c
perl output.c > data.c
bash output.c > key.c
perl output.c > data.c
```
The key-less `data.c` still compiles, but produces a different message
@@ -115,8 +115,8 @@ To combine the key and data, concatenate them together in either
order:
```sh
cat key.c data.c > output.c
cat data.c key.c > output.c
cat key.c data.c > output.c
cat data.c key.c > output.c
```
By default, `Nyaruko` generates a unique random key for every message,
@@ -124,7 +124,7 @@ using `/dev/urandom` as the seed. If given an extra command line
argument, `Nyaruko` will seed using that file instead of `/dev/urandom`:
```sh
./nyaruko seed.txt < input.bin > output.c
./nyaruko seed.txt < input.bin > output.c
```
This makes the output key deterministic, allowing the same key to be shared
2012/omoikane/index.html
+20 -21
View File
@@ -132,8 +132,7 @@
<h2 id="author"><a name="author"></a>Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Don_Yang">Don Yang</a><br>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)
<br><br></li>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
</ul>
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -142,25 +141,25 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
<h2 id="to-build">To build:</h2>
<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>
<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>
<p>There is an alternate version that will read from the compiled file itself, in
case you don’t have a <code>/dev/urandom</code> file. There is also a version that should
theoretically work with Windows which distinguishes binary and text. See
<a href="#alternate-code">alternate code</a> below.</p>
<h2 id="to-use">To use:</h2>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./nyaruko</span> <span class="pp">[</span><span class="ss">seed.txt</span><span class="pp">]</span> <span class="op">&lt;</span> original.bin <span class="op">&gt;</span> output.c</span>
<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a><span class="fu">bash</span> output.c <span class="op">&gt;</span> key.c</span>
<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a><span class="fu">perl</span> output.c <span class="op">&gt;</span> data.c</span>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./nyaruko</span> <span class="pp">[</span><span class="ss">seed.txt</span><span class="pp">]</span> <span class="op">&lt;</span> original.bin <span class="op">&gt;</span> output.c</span>
<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">bash</span> output.c <span class="op">&gt;</span> key.c</span>
<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a> <span class="fu">perl</span> output.c <span class="op">&gt;</span> data.c</span>
<span id="cb2-4"><a href="#cb2-4" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb2-5"><a href="#cb2-5" aria-hidden="true" tabindex="-1"></a><span class="fu">cat</span> key.c data.c <span class="op">&gt;</span> output.c</span>
<span id="cb2-5"><a href="#cb2-5" aria-hidden="true" tabindex="-1"></a> <span class="fu">cat</span> key.c data.c <span class="op">&gt;</span> output.c</span>
<span id="cb2-6"><a href="#cb2-6" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb2-7"><a href="#cb2-7" aria-hidden="true" tabindex="-1"></a><span class="fu">cc</span> output.c <span class="at">-o</span> output</span>
<span id="cb2-8"><a href="#cb2-8" aria-hidden="true" tabindex="-1"></a><span class="ex">./output</span> <span class="op">&gt;</span> regenerated.bin</span></code></pre></div>
<span id="cb2-7"><a href="#cb2-7" aria-hidden="true" tabindex="-1"></a> <span class="fu">cc</span> output.c <span class="at">-o</span> output</span>
<span id="cb2-8"><a href="#cb2-8" aria-hidden="true" tabindex="-1"></a> <span class="ex">./output</span> <span class="op">&gt;</span> regenerated.bin</span></code></pre></div>
<p>NOTE: if your OS does not have <code>/dev/urandom</code> then you should specify a seed
file or use the <a href="#alternate-code">alternate version</a> which reads in the compiled
binary itself.</p>
<h2 id="try">Try:</h2>
<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">./try.sh</span></span></code></pre></div>
<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">./try.sh</span></span></code></pre></div>
<p>The script <a href="try.sh">try.sh</a> will check if you have perl before trying to use the
perl parts of the script.</p>
<h2 id="alternate-code">Alternate code:</h2>
@@ -172,14 +171,14 @@ is like the first except it also should theoretically work with Windows, setting
binary mode on <code>stdin</code> and <code>stdout</code>.</p>
<h3 id="alternate-build">Alternate build:</h3>
<p>For the first version:</p>
<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="fu">make</span> alt</span></code></pre></div>
<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="fu">make</span> alt</span></code></pre></div>
<p>For the second version:</p>
<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">make</span> alt2</span></code></pre></div>
<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">make</span> alt2</span></code></pre></div>
<h3 id="alternate-use">Alternate use:</h3>
<p>Use <code>nyaruko.alt</code> or <code>nyaruko.alt2</code> as you would <code>nyaruko</code> above.</p>
<h3 id="alternate-try">Alternate try:</h3>
<p>For the first alternate version:</p>
<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="ex">./try.alt.sh</span></span></code></pre></div>
<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="ex">./try.alt.sh</span></span></code></pre></div>
<p>We have no way to test the second version, sorry (tm Canada :-) )!</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>The judges have nothing to add that has not already been written about in the
@@ -188,24 +187,24 @@ binary mode on <code>stdin</code> and <code>stdout</code>.</p>
<h3 id="usage">Usage</h3>
<p><code>Nyaruko</code> is a binary to text filter. Given some input on <code>stdin</code>,
<code>Nyaruko</code> will produce C code that reproduces this input on <code>stdout</code>:</p>
<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">./nyaruko</span> <span class="op">&lt;</span> original.bin <span class="op">&gt;</span> output.c</span>
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a><span class="fu">gcc</span> output.c <span class="at">-o</span> output</span>
<span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a><span class="ex">./output</span> <span class="op">&gt;</span> regenerated.bin</span></code></pre></div>
<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">./nyaruko</span> <span class="op">&lt;</span> original.bin <span class="op">&gt;</span> output.c</span>
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">gcc</span> output.c <span class="at">-o</span> output</span>
<span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">./output</span> <span class="op">&gt;</span> regenerated.bin</span></code></pre></div>
<p>Output is encrypted, but both key and data are included in the output.
To separate the key from the data, run these commands:</p>
<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="fu">bash</span> output.c <span class="op">&gt;</span> key.c</span>
<span id="cb8-2"><a href="#cb8-2" aria-hidden="true" tabindex="-1"></a><span class="fu">perl</span> output.c <span class="op">&gt;</span> data.c</span></code></pre></div>
<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="fu">bash</span> output.c <span class="op">&gt;</span> key.c</span>
<span id="cb8-2"><a href="#cb8-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">perl</span> output.c <span class="op">&gt;</span> data.c</span></code></pre></div>
<p>The key-less <code>data.c</code> still compiles, but produces a different message
on <code>stdout</code> instead of the original input. This message is a hint to
why the code is formatted the way it is.</p>
<p>To combine the key and data, concatenate them together in either
order:</p>
<div class="sourceCode" id="cb9"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a><span class="fu">cat</span> key.c data.c <span class="op">&gt;</span> output.c</span>
<span id="cb9-2"><a href="#cb9-2" aria-hidden="true" tabindex="-1"></a><span class="fu">cat</span> data.c key.c <span class="op">&gt;</span> output.c</span></code></pre></div>
<div class="sourceCode" id="cb9"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a> <span class="fu">cat</span> key.c data.c <span class="op">&gt;</span> output.c</span>
<span id="cb9-2"><a href="#cb9-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">cat</span> data.c key.c <span class="op">&gt;</span> output.c</span></code></pre></div>
<p>By default, <code>Nyaruko</code> generates a unique random key for every message,
using <code>/dev/urandom</code> as the seed. If given an extra command line
argument, <code>Nyaruko</code> will seed using that file instead of <code>/dev/urandom</code>:</p>
<div class="sourceCode" id="cb10"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./nyaruko</span> seed.txt <span class="op">&lt;</span> input.bin <span class="op">&gt;</span> output.c</span></code></pre></div>
<div class="sourceCode" id="cb10"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./nyaruko</span> seed.txt <span class="op">&lt;</span> input.bin <span class="op">&gt;</span> output.c</span></code></pre></div>
<p>This makes the output key deterministic, allowing the same key to be shared
across different files. On operating systems that do not have <code>/dev/urandom</code>,
users should always specify this extra seed argument to avoid indeterministic
2012/tromp/README.md
+123 -125
View File
@@ -1,9 +1,9 @@
## To build:
```sh
make all # On a 64-bit machine (default)
make all # On a 64-bit machine (default)
make tromp32 # On a 32-bit machine
make tromp32 # On a 32-bit machine
```
@@ -12,7 +12,7 @@ make tromp32 # On a 32-bit machine
The current status of this entry is:
```
STATUS: INABIAF - please **DO NOT** fix
STATUS: INABIAF - please **DO NOT** fix
```
For more detailed information see [2012 tromp bugs](../../bugs.html#2012_tromp).
@@ -21,7 +21,7 @@ For more detailed information see [2012 tromp bugs](../../bugs.html#2012_tromp).
## To use:
```sh
./tromp [-b]
./tromp [-b]
```
Use `./tromp32` as you would `./tromp` if on a 32-bit machine.
@@ -30,15 +30,15 @@ Use `./tromp32` as you would `./tromp` if on a 32-bit machine.
## To use:
```sh
cat ascii-prog.blc data | ./tromp -b
cat binary-prog.Blc data | ./tromp
cat ascii-prog.blc data | ./tromp -b
cat binary-prog.Blc data | ./tromp
```
## Try:
```sh
./try.sh
./try.sh
```
@@ -96,10 +96,10 @@ bit of input, and using characters `0` and `1` for output.
The program uses the following exit codes:
```
0: OK; result is a finite list
5: Out of term space
6: Out of memory
1,2,3,4,8,9: result not in list form
0: OK; result is a finite list
5: Out of term space
6: Out of memory
1,2,3,4,8,9: result not in list form
```
The size of the term space is fixed at compile time with `-DA`.
@@ -114,8 +114,8 @@ it will simply copy the input to the output (well, not that simply, since each
byte is smashed to bits and rebuilt from scratch). Voila: a half byte cat:
```sh
$ echo " Hello, world" | ./tromp
Hello, world
$ echo " Hello, world" | ./tromp
Hello, world
```
Since the least significant 4 bits of the first byte are just arbitrary padding
@@ -123,8 +123,8 @@ that is ignored by the program, any character from ASCII 32 (space) through 47
(`/`) will do, e.g.:
```sh
$ echo "*Hello, world" | ./tromp
Hello, world
$ echo "*Hello, world" | ./tromp
Hello, world
```
@@ -135,7 +135,7 @@ if the interpreter reaches end-of-file during program parsing,
it will crash in some way. E.g. the following might dump core:
```sh
echo -n "U" | ./tromp
echo -n "U" | ./tromp
```
Furthermore, the interpreter requires the initial encoded lambda term to be
@@ -144,7 +144,7 @@ lambdas. For instance, here the term `\ 5` is not closed, causing the
interpreter to crash when looking into a null-pointer environment:
```sh
echo ">Hello, world" | ./tromp
echo ">Hello, world" | ./tromp
```
will likely dump core.
@@ -201,8 +201,8 @@ The byte oriented BLC8 version weighs in at 43 bytes (shown in hexadecimal).
```
```sh
$ (cat uni8.Blc; echo " Ni hao") | ./tromp
Ni hao
$ (cat uni8.Blc; echo " Ni hao") | ./tromp
Ni hao
```
### A prime number sieve
@@ -226,8 +226,8 @@ Even shorter than the self-interpreter is this prime number sieve in 167 bits
The `n`th bit in the output indicates whether n is prime:
```sh
$ cat primes.blc | ./tromp -b | head -c 70
0011010100010100010100010000010100000100010100010000010000010100000100
$ cat primes.blc | ./tromp -b | head -c 70
0011010100010100010100010000010100000100010100010000010000010100000100
```
For those who prefer to digest their primes in decimal, there is `oddindices.Blc`,
@@ -236,8 +236,8 @@ which will print the indices of all odd characters (with
separated by a given character:
```
$ (cat oddindices.Blc; echo -n " "; cat primes.blc | ./tromp -b) | ./tromp | head -c 70
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
$ (cat oddindices.Blc; echo -n " "; cat primes.blc | ./tromp -b) | ./tromp | head -c 70
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
```
### A Space filling program
@@ -266,44 +266,43 @@ It expects `n` arbitrary characters of input, and draws a space filling [Hilbert
curve](https://en.wikipedia.org/wiki/Hilbert_curve) of order `n`:
```sh
$ (cat hilbert.Blc; echo -n "1") | ./tromp
_
| |
$ (cat hilbert.Blc; echo -n "1") | ./tromp
_
| |
$ (cat hilbert.Blc; echo -n "12") | ./tromp
_ _
| |_| |
|_ _|
_| |_
$ (cat hilbert.Blc; echo -n "12") | ./tromp
_ _
| |_| |
|_ _|
_| |_
$ (cat hilbert.Blc; echo -n "123") | ./tromp
_ _ _ _
| |_| | | |_| |
|_ _| |_ _|
_| |_____| |_
| ___ ___ |
|_| _| |_ |_|
_ |_ _| _
| |___| |___| |
$ (cat hilbert.Blc; echo -n "1234") | ./tromp
_ _ _ _ _ _ _ _
| |_| | | |_| | | |_| | | |_| |
|_ _| |_ _| |_ _| |_ _|
_| |_____| |_ _| |_____| |_
| ___ ___ | | ___ ___ |
|_| _| |_ |_| |_| _| |_ |_|
_ |_ _| _ _ |_ _| _
| |___| |___| |_| |___| |___| |
|_ ___ ___ ___ ___ _|
_| |_ |_| _| |_ |_| _| |_
| _ | _ |_ _| _ | _ |
|_| |_| | |___| |___| | |_| |_|
_ _ | ___ ___ | _ _
| |_| | |_| _| |_ |_| | |_| |
|_ _| _ |_ _| _ |_ _|
_| |___| |___| |___| |___| |_
$ (cat hilbert.Blc; echo -n "123") | ./tromp
_ _ _ _
| |_| | | |_| |
|_ _| |_ _|
_| |_____| |_
| ___ ___ |
|_| _| |_ |_|
_ |_ _| _
| |___| |___| |
$ (cat hilbert.Blc; echo -n "1234") | ./tromp
_ _ _ _ _ _ _ _
| |_| | | |_| | | |_| | | |_| |
|_ _| |_ _| |_ _| |_ _|
_| |_____| |_ _| |_____| |_
| ___ ___ | | ___ ___ |
|_| _| |_ |_| |_| _| |_ |_|
_ |_ _| _ _ |_ _| _
| |___| |___| |_| |___| |___| |
|_ ___ ___ ___ ___ _|
_| |_ |_| _| |_ |_| _| |_
| _ | _ |_ _| _ | _ |
|_| |_| | |___| |___| | |_| |_|
_ _ | ___ ___ | _ _
| |_| | |_| _| |_ |_| | |_| |
|_ _| _ |_ _| _ |_ _|
_| |___| |___| |___| |___| |_
```
### A [Brainfuck](https://en.wikipedia.org/wiki/Brainfuck) interpreter
@@ -313,15 +312,15 @@ The smallest known BF interpreter is written in... you guessed it,
coming in at 112 bytes (including 3 bits of padding):
```
$ od -t x4 bf.Blc
0000000 01a15144 02d55584 223070b7 00f032ff
0000020 7f85f9bf 956fe15e c0ee7d7f 006854e5
0000040 fbfd5558 fd5745e0 b6f0fbeb 07d62ff0
0000060 d7736fe1 c0bc14f1 1f2eff0b 17666fa1
0000100 2fef5be8 ff13ffcf 2034cae1 0bd0c80a
0000120 e51fee99 6a5a7fff ff0fff1f d0049d87
0000140 db0500ab 3bb74023 b0c0cc28 10740e6c
0000160
$ od -t x4 bf.Blc
0000000 01a15144 02d55584 223070b7 00f032ff
0000020 7f85f9bf 956fe15e c0ee7d7f 006854e5
0000040 fbfd5558 fd5745e0 b6f0fbeb 07d62ff0
0000060 d7736fe1 c0bc14f1 1f2eff0b 17666fa1
0000100 2fef5be8 ff13ffcf 2034cae1 0bd0c80a
0000120 e51fee99 6a5a7fff ff0fff1f d0049d87
0000140 db0500ab 3bb74023 b0c0cc28 10740e6c
0000160
```
It expects its input to consist of a
@@ -330,10 +329,10 @@ It expects its input to consist of a
followed by a `]`, followed by the input for the Brainfuck program.
```
$ more hw.bf
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.]
$ cat bf.Blc hw.bf | ./tromp
Hello World!
$ more hw.bf
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.]
$ cat bf.Blc hw.bf | ./tromp
Hello World!
```
Curiously, the interpreter `bf.Blc` is the exact same size as `hw.bf`.
@@ -346,10 +345,9 @@ translates single-letter-variable lambda calculus into BLC:
```sh
$ echo "\f\x f (f (f x))" > three
$ cat parse.Blc three | ./tromp
000001110011100111010
$ echo "\f\x f (f (f x))" > three
$ cat parse.Blc three | ./tromp
000001110011100111010
```
### Converting between bits and bytes
@@ -361,24 +359,24 @@ into BLC8:
So we could assemble an input reversing program as
```sh
echo "\a a ((\b b b) (\b \c \d \e d (b b) (\f f c e))) (\b \c c)" > reverse
cat parse.Blc reverse | ./tromp > reverse.blc
echo "\a a ((\b b b) (\b \c \d \e d (b b) (\f f c e))) (\b \c c)" > reverse
cat parse.Blc reverse | ./tromp > reverse.blc
```
and change it to BLC8 with
```sh
$ cat deflate.Blc reverse.blc | ./tromp > rev.Blc
$ wc rev.Blc
0 1 9 rev.Blc
$ cat deflate.Blc reverse.blc | ./tromp > rev.Blc
$ wc rev.Blc
0 1 9 rev.Blc
```
and then try it out with:
```sh
$ cat rev.Blc - | ./tromp
Hello, world!
^D
!dlrow ,olleH
$ cat rev.Blc - | ./tromp
Hello, world!
^D
!dlrow ,olleH
```
### Symbolic Lambda Calculus reduction
@@ -387,24 +385,24 @@ BLC8 program `symbolic.Blc` shows individual reduction steps on symbolic lambda
Here it is used to show the calculation of 2^3 in Church numerals:
```sh
$ echo "(\f\x f (f (f x))) (\f\x f (f x))" > threetwo
$ cat parse.Blc threetwo | ./tromp > threetwo.blc
$ cat symbolic.Blc threetwo.blc | ./tromp
(\a \b a (a (a b))) (\a \b a (a b))
\a (\b \c b (b c)) ((\b \c b (b c)) ((\b \c b (b c)) a))
\a \b (\c \d c (c d)) ((\c \d c (c d)) a) ((\c \d c (c d)) ((\c \d c (c d)) a) b)
\a \b (\c (\d \e d (d e)) a ((\d \e d (d e)) a c)) ((\c \d c (c d)) ((\c \d c (c d)) a) b)
\a \b (\c \d c (c d)) a ((\c \d c (c d)) a ((\c \d c (c d)) ((\c \d c (c d)) a) b))
\a \b (\c a (a c)) ((\c \d c (c d)) a ((\c \d c (c d)) ((\c \d c (c d)) a) b))
\a \b a (a ((\c \d c (c d)) a ((\c \d c (c d)) ((\c \d c (c d)) a) b)))
\a \b a (a ((\c a (a c)) ((\c \d c (c d)) ((\c \d c (c d)) a) b)))
\a \b a (a (a (a ((\c \d c (c d)) ((\c \d c (c d)) a) b))))
\a \b a (a (a (a ((\c (\d \e d (d e)) a ((\d \e d (d e)) a c)) b))))
\a \b a (a (a (a ((\c \d c (c d)) a ((\c \d c (c d)) a b)))))
\a \b a (a (a (a ((\c a (a c)) ((\c \d c (c d)) a b)))))
\a \b a (a (a (a (a (a ((\c \d c (c d)) a b))))))
\a \b a (a (a (a (a (a ((\c a (a c)) b))))))
\a \b a (a (a (a (a (a (a (a b)))))))
$ echo "(\f\x f (f (f x))) (\f\x f (f x))" > threetwo
$ cat parse.Blc threetwo | ./tromp > threetwo.blc
$ cat symbolic.Blc threetwo.blc | ./tromp
(\a \b a (a (a b))) (\a \b a (a b))
\a (\b \c b (b c)) ((\b \c b (b c)) ((\b \c b (b c)) a))
\a \b (\c \d c (c d)) ((\c \d c (c d)) a) ((\c \d c (c d)) ((\c \d c (c d)) a) b)
\a \b (\c (\d \e d (d e)) a ((\d \e d (d e)) a c)) ((\c \d c (c d)) ((\c \d c (c d)) a) b)
\a \b (\c \d c (c d)) a ((\c \d c (c d)) a ((\c \d c (c d)) ((\c \d c (c d)) a) b))
\a \b (\c a (a c)) ((\c \d c (c d)) a ((\c \d c (c d)) ((\c \d c (c d)) a) b))
\a \b a (a ((\c \d c (c d)) a ((\c \d c (c d)) ((\c \d c (c d)) a) b)))
\a \b a (a ((\c a (a c)) ((\c \d c (c d)) ((\c \d c (c d)) a) b)))
\a \b a (a (a (a ((\c \d c (c d)) ((\c \d c (c d)) a) b))))
\a \b a (a (a (a ((\c (\d \e d (d e)) a ((\d \e d (d e)) a c)) b))))
\a \b a (a (a (a ((\c \d c (c d)) a ((\c \d c (c d)) a b)))))
\a \b a (a (a (a ((\c a (a c)) ((\c \d c (c d)) a b)))))
\a \b a (a (a (a (a (a ((\c \d c (c d)) a b))))))
\a \b a (a (a (a (a (a ((\c a (a c)) b))))))
\a \b a (a (a (a (a (a (a (a b)))))))
```
As expected, the resulting normal form is [Church
@@ -415,8 +413,8 @@ exact inverse of the above assembler. The prime number sieve disassembles as
follows:
```sh
$ cat symbolic.Blc primes.blc | ./tromp | head -1
\a (\b b (b ((\c c c) (\c \d \e e (\f \g g) ((\f c c f ((\g g g) (\g f (g g)))) (\f \g \h \i i g (h (d f))))) (\c \d \e b (e c))))) (\b \c c (\d \e d) b)
$ cat symbolic.Blc primes.blc | ./tromp | head -1
\a (\b b (b ((\c c c) (\c \d \e e (\f \g g) ((\f c c f ((\g g g) (\g f (g g)))) (\f \g \h \i i g (h (d f))))) (\c \d \e b (e c))))) (\b \c c (\d \e d) b)
```
Hardly any less obfuscated...
@@ -424,13 +422,13 @@ Hardly any less obfuscated...
The last line of
```sh
cat symbolic.Blc primes.blc | ./tromp | head -16
cat symbolic.Blc primes.blc | ./tromp | head -16
```
starts out as
```
\a \b b (\c \d c) (\c c (\d \e d) (\d d (\e \f f) (\e e (\f \g g) ((\f (\g \h \i
\a \b b (\c \d c) (\c c (\d \e d) (\d d (\e \f f) (\e e (\f \g g) ((\f (\g \h \i
```
The `\a` is for ignoring the rest of the input (to which the universal machine
@@ -462,16 +460,16 @@ under the interpreter perform much worse than that same program written in Haske
Our interpreter copes well with extra levels of interpretation:
```sh
$ time cat primes.blc | ./tromp -b | head -c 210 > /dev/null
real 0m0.043s
$ time cat uni.blc primes.blc | ./tromp -b | head -c 210 > /dev/null
real 0m0.191s
$ time cat uni.blc uni.blc primes.blc | ./tromp -b | head -c 210 > /dev/null
real 0m1.919s
$ time cat uni.blc uni.blc uni.blc primes.blc | ./tromp -b | head -c 210 > /dev/null
real 0m23.514s
$ time cat uni.blc uni.blc uni.blc uni.blc primes.blc | ./tromp -b | head -c 210 > /dev/null
real 4m52.700s
$ time cat primes.blc | ./tromp -b | head -c 210 > /dev/null
real 0m0.043s
$ time cat uni.blc primes.blc | ./tromp -b | head -c 210 > /dev/null
real 0m0.191s
$ time cat uni.blc uni.blc primes.blc | ./tromp -b | head -c 210 > /dev/null
real 0m1.919s
$ time cat uni.blc uni.blc uni.blc primes.blc | ./tromp -b | head -c 210 > /dev/null
real 0m23.514s
$ time cat uni.blc uni.blc uni.blc uni.blc primes.blc | ./tromp -b | head -c 210 > /dev/null
real 4m52.700s
```
### Obfuscation
@@ -495,15 +493,15 @@ The program freely (without casting) converts between `int` and `int *`, causing
many warnings;
```
note: expected 'int *' but argument is of type 'int'
warning: assignment from incompatible pointer type
warning: assignment makes integer from pointer without a cast
warning: assignment makes pointer from integer without a cast
warning: incompatible implicit declaration of built-in function 'calloc'
warning: incompatible implicit declaration of built-in function 'exit'
warning: passing argument 1 of 'd' makes pointer from integer without a cast
warning: passing argument 1 of 'p' makes pointer from integer without a cast
warning: pointer/integer type mismatch in conditional expression
note: expected 'int *' but argument is of type 'int'
warning: assignment from incompatible pointer type
warning: assignment makes integer from pointer without a cast
warning: assignment makes pointer from integer without a cast
warning: incompatible implicit declaration of built-in function 'calloc'
warning: incompatible implicit declaration of built-in function 'exit'
warning: passing argument 1 of 'd' makes pointer from integer without a cast
warning: passing argument 1 of 'p' makes pointer from integer without a cast
warning: pointer/integer type mismatch in conditional expression
```
Avoiding these would make the program substantially longer,
2012/tromp/how.html
+23 -23
View File
@@ -133,10 +133,10 @@ continuations (see the 3rd reference for details).</p>
<p>The term space holds <a href="https://en.wikipedia.org/wiki/Lambda_calculus">lambda
calculus</a> terms in the following
format. 0 denotes some form of I/O; the only four occurrences are at:</p>
<pre><code> C=13: recognizes end of a byte
C=20: recognize output of 0 bit
C=21: recognize output of 1 bit
C=end: input list, expanded lazily</code></pre>
<pre><code> C=13: recognizes end of a byte
C=20: recognize output of 0 bit
C=21: recognize output of 1 bit
C=end: input list, expanded lazily</code></pre>
<p><code>1</code> denotes a variable, with the next entry its <a href="https://en.wikipedia.org/wiki/De_Bruijn_index">de Bruijn
index</a>.</p>
<p><code>2</code> denotes application with the next entry the size of the term being applied.</p>
@@ -150,26 +150,26 @@ free list.</li>
<li>lambda term (index in term space).</li>
</ol>
<p>Here’s what each variable does:</p>
<pre><code>L Lambda term space
m mode: 0 for bits and 7 for bytes
b bits remaining unread in I, -1 on EOF
D Desirable temporary
c continuation context
a active environment pointer
C Current term index
U Ultimate term pointer
u utility entry
B Born to be free-list of closures
I Input character
O Output character
e entry of current term</code></pre>
<pre><code> L Lambda term space
m mode: 0 for bits and 7 for bytes
b bits remaining unread in I, -1 on EOF
D Desirable temporary
c continuation context
a active environment pointer
C Current term index
U Ultimate term pointer
u utility entry
B Born to be free-list of closures
I Input character
O Output character
e entry of current term</code></pre>
<p>Here’s what each of the 6 auxiliary functions do:</p>
<pre><code>s variable lookup in active environment with de Bruijn index u
S gets one bit of input, setting b to -1 on EOF or to remaining number of bits in current byte
k copy fragment from string literal holding lambda terms xor 46 into current end of term space
x expand input, adding 11 (resp. 99) entries to term space for bit (resp. byte) mode
p parses BLC-encoded lambda term using S(), stores results in term space and returns length
d decrease reference counter, add record to free list on reaching zero</code></pre>
<pre><code> s variable lookup in active environment with de Bruijn index u
S gets one bit of input, setting b to -1 on EOF or to remaining number of bits in current byte
k copy fragment from string literal holding lambda terms xor 46 into current end of term space
x expand input, adding 11 (resp. 99) entries to term space for bit (resp. byte) mode
p parses BLC-encoded lambda term using S(), stores results in term space and returns length
d decrease reference counter, add record to free list on reaching zero</code></pre>
<!--
Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
2012/tromp/how.md
+23 -23
View File
@@ -13,10 +13,10 @@ calculus](https://en.wikipedia.org/wiki/Lambda_calculus) terms in the following
format. 0 denotes some form of I/O; the only four occurrences are at:
```
C=13: recognizes end of a byte
C=20: recognize output of 0 bit
C=21: recognize output of 1 bit
C=end: input list, expanded lazily
C=13: recognizes end of a byte
C=20: recognize output of 0 bit
C=21: recognize output of 1 bit
C=end: input list, expanded lazily
```
`1` denotes a variable, with the next entry its [de Bruijn
@@ -38,30 +38,30 @@ free list.
Here's what each variable does:
```
L Lambda term space
m mode: 0 for bits and 7 for bytes
b bits remaining unread in I, -1 on EOF
D Desirable temporary
c continuation context
a active environment pointer
C Current term index
U Ultimate term pointer
u utility entry
B Born to be free-list of closures
I Input character
O Output character
e entry of current term
L Lambda term space
m mode: 0 for bits and 7 for bytes
b bits remaining unread in I, -1 on EOF
D Desirable temporary
c continuation context
a active environment pointer
C Current term index
U Ultimate term pointer
u utility entry
B Born to be free-list of closures
I Input character
O Output character
e entry of current term
```
Here's what each of the 6 auxiliary functions do:
```
s variable lookup in active environment with de Bruijn index u
S gets one bit of input, setting b to -1 on EOF or to remaining number of bits in current byte
k copy fragment from string literal holding lambda terms xor 46 into current end of term space
x expand input, adding 11 (resp. 99) entries to term space for bit (resp. byte) mode
p parses BLC-encoded lambda term using S(), stores results in term space and returns length
d decrease reference counter, add record to free list on reaching zero
s variable lookup in active environment with de Bruijn index u
S gets one bit of input, setting b to -1 on EOF or to remaining number of bits in current byte
k copy fragment from string literal holding lambda terms xor 46 into current end of term space
x expand input, adding 11 (resp. 99) entries to term space for bit (resp. byte) mode
p parses BLC-encoded lambda term using S(), stores results in term space and returns length
d decrease reference counter, add record to free list on reaching zero
```
2012/tromp/index.html
+124 -125
View File
@@ -132,8 +132,7 @@
<h2 id="author"><a name="author"></a>Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#John_Tromp">John Tromp</a><br>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)
<br><br></li>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
</ul>
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -142,21 +141,21 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
<h2 id="to-build">To build:</h2>
<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> all <span class="co"># On a 64-bit machine (default)</span></span>
<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> all <span class="co"># On a 64-bit machine (default)</span></span>
<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span> tromp32 <span class="co"># On a 32-bit machine</span></span></code></pre></div>
<span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabindex="-1"></a> <span class="fu">make</span> tromp32 <span class="co"># On a 32-bit machine</span></span></code></pre></div>
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
<p>The current status of this entry is:</p>
<pre><code>STATUS: INABIAF - please **DO NOT** fix</code></pre>
<pre><code> STATUS: INABIAF - please **DO NOT** fix</code></pre>
<p>For more detailed information see <a href="../../bugs.html#2012_tromp">2012 tromp bugs</a>.</p>
<h2 id="to-use">To use:</h2>
<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">./tromp</span> <span class="pp">[-</span><span class="ss">b</span><span class="pp">]</span></span></code></pre></div>
<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">./tromp</span> <span class="pp">[-</span><span class="ss">b</span><span class="pp">]</span></span></code></pre></div>
<p>Use <code>./tromp32</code> as you would <code>./tromp</code> if on a 32-bit machine.</p>
<h2 id="to-use-1">To use:</h2>
<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="fu">cat</span> ascii-prog.blc data <span class="kw">|</span> <span class="ex">./tromp</span> <span class="at">-b</span></span>
<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a><span class="fu">cat</span> binary-prog.Blc data <span class="kw">|</span> <span class="ex">./tromp</span></span></code></pre></div>
<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="fu">cat</span> ascii-prog.blc data <span class="kw">|</span> <span class="ex">./tromp</span> <span class="at">-b</span></span>
<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">cat</span> binary-prog.Blc data <span class="kw">|</span> <span class="ex">./tromp</span></span></code></pre></div>
<h2 id="try">Try:</h2>
<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="ex">./try.sh</span></span></code></pre></div>
<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="ex">./try.sh</span></span></code></pre></div>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>The judges dare to say that the data files this entry is processing
are more obfuscated than the entry itself.</p>
@@ -196,10 +195,10 @@ under 6K in size.</p>
With one (arbitrary) argument, it runs in bit mode, using only the least significant
bit of input, and using characters <code>0</code> and <code>1</code> for output.</p>
<p>The program uses the following exit codes:</p>
<pre><code>0: OK; result is a finite list
5: Out of term space
6: Out of memory
1,2,3,4,8,9: result not in list form</code></pre>
<pre><code> 0: OK; result is a finite list
5: Out of term space
6: Out of memory
1,2,3,4,8,9: result not in list form</code></pre>
<p>The size of the term space is fixed at compile time with <code>-DA</code>.</p>
<h3 id="a-half-byte-cat">A half byte <code>cat</code></h3>
<p>The shortest (closed) lambda calculus term is <code>\x x (\ 1</code> in <a href="https://en.wikipedia.org/wiki/De_Bruijn_notation">De Bruijn
@@ -207,23 +206,23 @@ notation</a>) which is the
identity function. When its encoding <code>0010</code> is fed into the universal machine,
it will simply copy the input to the output (well, not that simply, since each
byte is smashed to bits and rebuilt from scratch). Voila: a half byte cat:</p>
<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">$</span> echo <span class="st">&quot; Hello, world&quot;</span> <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a><span class="ex">Hello,</span> world</span></code></pre></div>
<div class="sourceCode" id="cb7"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo <span class="st">&quot; Hello, world&quot;</span> <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">Hello,</span> world</span></code></pre></div>
<p>Since the least significant 4 bits of the first byte are just arbitrary padding
that is ignored by the program, any character from ASCII 32 (space) through 47
(<code>/</code>) will do, e.g.:</p>
<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">$</span> echo <span class="st">&quot;*Hello, world&quot;</span> <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb8-2"><a href="#cb8-2" aria-hidden="true" tabindex="-1"></a><span class="ex">Hello,</span> world</span></code></pre></div>
<div class="sourceCode" id="cb8"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo <span class="st">&quot;*Hello, world&quot;</span> <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb8-2"><a href="#cb8-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">Hello,</span> world</span></code></pre></div>
<h3 id="bad-programs">Bad programs</h3>
<p>If the input doesn’t start with a valid program, that is,
if the interpreter reaches end-of-file during program parsing,
it will crash in some way. E.g. the following might dump core:</p>
<div class="sourceCode" id="cb9"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a><span class="bu">echo</span> <span class="at">-n</span> <span class="st">&quot;U&quot;</span> <span class="kw">|</span> <span class="ex">./tromp</span></span></code></pre></div>
<div class="sourceCode" id="cb9"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a> <span class="bu">echo</span> <span class="at">-n</span> <span class="st">&quot;U&quot;</span> <span class="kw">|</span> <span class="ex">./tromp</span></span></code></pre></div>
<p>Furthermore, the interpreter requires the initial encoded lambda term to be
closed, that is, variable <code>n</code> can only appear within at least <code>n</code> enclosing
lambdas. For instance, here the term <code>\ 5</code> is not closed, causing the
interpreter to crash when looking into a null-pointer environment:</p>
<div class="sourceCode" id="cb10"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="bu">echo</span> <span class="st">&quot;&gt;Hello, world&quot;</span> <span class="kw">|</span> <span class="ex">./tromp</span></span></code></pre></div>
<div class="sourceCode" id="cb10"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a> <span class="bu">echo</span> <span class="st">&quot;&gt;Hello, world&quot;</span> <span class="kw">|</span> <span class="ex">./tromp</span></span></code></pre></div>
<p>will likely dump core.</p>
<p>Since these properties can be checked when creating
<a href="https://tromp.github.io/cl/Binary_lambda_calculus.html">BLC</a> programs,
@@ -266,8 +265,8 @@ as a self interpreter in BLC it is downright minuscule at 232 bits (29 bytes):</
0b7fb 00cf6
7bb03 91a1a
</code></pre>
<div class="sourceCode" id="cb13"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb13-1"><a href="#cb13-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> <span class="er">(</span><span class="fu">cat</span> uni8.Blc<span class="kw">;</span> <span class="bu">echo</span> <span class="st">&quot; Ni hao&quot;</span><span class="kw">)</span> <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb13-2"><a href="#cb13-2" aria-hidden="true" tabindex="-1"></a><span class="ex">Ni</span> hao</span></code></pre></div>
<div class="sourceCode" id="cb13"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb13-1"><a href="#cb13-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> <span class="er">(</span><span class="fu">cat</span> uni8.Blc<span class="kw">;</span> <span class="bu">echo</span> <span class="st">&quot; Ni hao&quot;</span><span class="kw">)</span> <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb13-2"><a href="#cb13-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">Ni</span> hao</span></code></pre></div>
<h3 id="a-prime-number-sieve">A prime number sieve</h3>
<p>Even shorter than the self-interpreter is this prime number sieve in 167 bits
(under 21 bytes):</p>
@@ -282,14 +281,14 @@ as a self interpreter in BLC it is downright minuscule at 232 bits (29 bytes):</
0000110110
</code></pre>
<p>The <code>n</code>th bit in the output indicates whether n is prime:</p>
<div class="sourceCode" id="cb15"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb15-1"><a href="#cb15-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> cat primes.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="at">-b</span> <span class="kw">|</span> <span class="fu">head</span> <span class="at">-c</span> 70</span>
<span id="cb15-2"><a href="#cb15-2" aria-hidden="true" tabindex="-1"></a><span class="ex">0011010100010100010100010000010100000100010100010000010000010100000100</span></span></code></pre></div>
<div class="sourceCode" id="cb15"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb15-1"><a href="#cb15-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> cat primes.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="at">-b</span> <span class="kw">|</span> <span class="fu">head</span> <span class="at">-c</span> 70</span>
<span id="cb15-2"><a href="#cb15-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">0011010100010100010100010000010100000100010100010000010000010100000100</span></span></code></pre></div>
<p>For those who prefer to digest their primes in decimal, there is <code>oddindices.Blc</code>,
which will print the indices of all odd characters (with
<a href="https://en.wikipedia.org/wiki/Bit_numbering">LSB</a> = 1)
separated by a given character:</p>
<pre><code>$ (cat oddindices.Blc; echo -n &quot; &quot;; cat primes.blc | ./tromp -b) | ./tromp | head -c 70
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97</code></pre>
<pre><code> $ (cat oddindices.Blc; echo -n &quot; &quot;; cat primes.blc | ./tromp -b) | ./tromp | head -c 70
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97</code></pre>
<h3 id="a-space-filling-program">A Space filling program</h3>
<p>The program <code>hilbert.Blc</code>, at 143 bytes, is a very twisty “one-liner” (shown in hexadecimal):</p>
<pre><code> 1818181 8111154 6806041 55ff041
@@ -309,120 +308,120 @@ separated by a given character:</p>
60 8191a00167fb cbcfdf65f7c0 a20</code></pre>
<p>It expects <code>n</code> arbitrary characters of input, and draws a space filling <a href="https://en.wikipedia.org/wiki/Hilbert_curve">Hilbert
curve</a> of order <code>n</code>:</p>
<div class="sourceCode" id="cb18"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb18-1"><a href="#cb18-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> <span class="er">(</span><span class="fu">cat</span> hilbert.Blc<span class="kw">;</span> <span class="bu">echo</span> <span class="at">-n</span> <span class="st">&quot;1&quot;</span><span class="kw">)</span> <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb18-2"><a href="#cb18-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span></span>
<span id="cb18-3"><a href="#cb18-3" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span> <span class="kw">|</span></span>
<div class="sourceCode" id="cb18"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb18-1"><a href="#cb18-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> <span class="er">(</span><span class="fu">cat</span> hilbert.Blc<span class="kw">;</span> <span class="bu">echo</span> <span class="at">-n</span> <span class="st">&quot;1&quot;</span><span class="kw">)</span> <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb18-2"><a href="#cb18-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span></span>
<span id="cb18-3"><a href="#cb18-3" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span> <span class="kw">|</span></span>
<span id="cb18-4"><a href="#cb18-4" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb18-5"><a href="#cb18-5" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> <span class="er">(</span><span class="fu">cat</span> hilbert.Blc<span class="kw">;</span> <span class="bu">echo</span> <span class="at">-n</span> <span class="st">&quot;12&quot;</span><span class="kw">)</span> <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb18-6"><a href="#cb18-6" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span> _</span>
<span id="cb18-7"><a href="#cb18-7" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span></span>
<span id="cb18-8"><a href="#cb18-8" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span></span>
<span id="cb18-9"><a href="#cb18-9" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span></span>
<span id="cb18-5"><a href="#cb18-5" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> <span class="er">(</span><span class="fu">cat</span> hilbert.Blc<span class="kw">;</span> <span class="bu">echo</span> <span class="at">-n</span> <span class="st">&quot;12&quot;</span><span class="kw">)</span> <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb18-6"><a href="#cb18-6" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span> _</span>
<span id="cb18-7"><a href="#cb18-7" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span></span>
<span id="cb18-8"><a href="#cb18-8" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span></span>
<span id="cb18-9"><a href="#cb18-9" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span></span>
<span id="cb18-10"><a href="#cb18-10" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb18-11"><a href="#cb18-11" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> <span class="er">(</span><span class="fu">cat</span> hilbert.Blc<span class="kw">;</span> <span class="bu">echo</span> <span class="at">-n</span> <span class="st">&quot;123&quot;</span><span class="kw">)</span> <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb18-12"><a href="#cb18-12" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span> _ _ _</span>
<span id="cb18-13"><a href="#cb18-13" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span></span>
<span id="cb18-14"><a href="#cb18-14" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span></span>
<span id="cb18-15"><a href="#cb18-15" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_____</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span></span>
<span id="cb18-16"><a href="#cb18-16" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span> <span class="ex">___</span> ___ <span class="kw">|</span></span>
<span id="cb18-17"><a href="#cb18-17" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span></span>
<span id="cb18-18"><a href="#cb18-18" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="ex">_</span></span>
<span id="cb18-19"><a href="#cb18-19" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span></span>
<span id="cb18-11"><a href="#cb18-11" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> <span class="er">(</span><span class="fu">cat</span> hilbert.Blc<span class="kw">;</span> <span class="bu">echo</span> <span class="at">-n</span> <span class="st">&quot;123&quot;</span><span class="kw">)</span> <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb18-12"><a href="#cb18-12" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span> _ _ _</span>
<span id="cb18-13"><a href="#cb18-13" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span></span>
<span id="cb18-14"><a href="#cb18-14" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span></span>
<span id="cb18-15"><a href="#cb18-15" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_____</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span></span>
<span id="cb18-16"><a href="#cb18-16" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span> <span class="ex">___</span> ___ <span class="kw">|</span></span>
<span id="cb18-17"><a href="#cb18-17" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span></span>
<span id="cb18-18"><a href="#cb18-18" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="ex">_</span></span>
<span id="cb18-19"><a href="#cb18-19" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span></span>
<span id="cb18-20"><a href="#cb18-20" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb18-21"><a href="#cb18-21" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> <span class="er">(</span><span class="fu">cat</span> hilbert.Blc<span class="kw">;</span> <span class="bu">echo</span> <span class="at">-n</span> <span class="st">&quot;1234&quot;</span><span class="kw">)</span> <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb18-22"><a href="#cb18-22" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span> _ _ _ _ _ _ _</span>
<span id="cb18-23"><a href="#cb18-23" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span></span>
<span id="cb18-24"><a href="#cb18-24" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span></span>
<span id="cb18-25"><a href="#cb18-25" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_____</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="kw">|</span><span class="ex">_____</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span></span>
<span id="cb18-26"><a href="#cb18-26" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span> <span class="ex">___</span> ___ <span class="kw">|</span> <span class="kw">|</span> <span class="ex">___</span> ___ <span class="kw">|</span></span>
<span id="cb18-27"><a href="#cb18-27" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span></span>
<span id="cb18-28"><a href="#cb18-28" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="ex">_</span> _ <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="ex">_</span></span>
<span id="cb18-29"><a href="#cb18-29" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span></span>
<span id="cb18-30"><a href="#cb18-30" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span><span class="ex">_</span> ___ ___ ___ ___ _<span class="kw">|</span></span>
<span id="cb18-31"><a href="#cb18-31" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span></span>
<span id="cb18-32"><a href="#cb18-32" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span> <span class="ex">_</span> <span class="kw">|</span> <span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="ex">_</span> <span class="kw">|</span> <span class="ex">_</span> <span class="kw">|</span></span>
<span id="cb18-33"><a href="#cb18-33" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span></span>
<span id="cb18-34"><a href="#cb18-34" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span> _ <span class="kw">|</span> <span class="ex">___</span> ___ <span class="kw">|</span> <span class="ex">_</span> _</span>
<span id="cb18-35"><a href="#cb18-35" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span></span>
<span id="cb18-36"><a href="#cb18-36" aria-hidden="true" tabindex="-1"></a><span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span></span>
<span id="cb18-37"><a href="#cb18-37" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span></span></code></pre></div>
<span id="cb18-21"><a href="#cb18-21" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> <span class="er">(</span><span class="fu">cat</span> hilbert.Blc<span class="kw">;</span> <span class="bu">echo</span> <span class="at">-n</span> <span class="st">&quot;1234&quot;</span><span class="kw">)</span> <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb18-22"><a href="#cb18-22" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span> _ _ _ _ _ _ _</span>
<span id="cb18-23"><a href="#cb18-23" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span></span>
<span id="cb18-24"><a href="#cb18-24" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span></span>
<span id="cb18-25"><a href="#cb18-25" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_____</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="kw">|</span><span class="ex">_____</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span></span>
<span id="cb18-26"><a href="#cb18-26" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span> <span class="ex">___</span> ___ <span class="kw">|</span> <span class="kw">|</span> <span class="ex">___</span> ___ <span class="kw">|</span></span>
<span id="cb18-27"><a href="#cb18-27" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span></span>
<span id="cb18-28"><a href="#cb18-28" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="ex">_</span> _ <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="ex">_</span></span>
<span id="cb18-29"><a href="#cb18-29" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span></span>
<span id="cb18-30"><a href="#cb18-30" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span><span class="ex">_</span> ___ ___ ___ ___ _<span class="kw">|</span></span>
<span id="cb18-31"><a href="#cb18-31" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span></span>
<span id="cb18-32"><a href="#cb18-32" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span> <span class="ex">_</span> <span class="kw">|</span> <span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="ex">_</span> <span class="kw">|</span> <span class="ex">_</span> <span class="kw">|</span></span>
<span id="cb18-33"><a href="#cb18-33" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span></span>
<span id="cb18-34"><a href="#cb18-34" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span> _ <span class="kw">|</span> <span class="ex">___</span> ___ <span class="kw">|</span> <span class="ex">_</span> _</span>
<span id="cb18-35"><a href="#cb18-35" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span></span>
<span id="cb18-36"><a href="#cb18-36" aria-hidden="true" tabindex="-1"></a> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span> <span class="ex">_</span> <span class="kw">|</span><span class="ex">_</span> _<span class="kw">|</span></span>
<span id="cb18-37"><a href="#cb18-37" aria-hidden="true" tabindex="-1"></a> <span class="ex">_</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">___</span><span class="kw">|</span> <span class="kw">|</span><span class="ex">_</span></span></code></pre></div>
<h3 id="a-brainfuck-interpreter">A <a href="https://en.wikipedia.org/wiki/Brainfuck">Brainfuck</a> interpreter</h3>
<p>The smallest known BF interpreter is written in… you guessed it,
<a href="https://tromp.github.io/cl/Binary_lambda_calculus.html">BLC</a>,
coming in at 112 bytes (including 3 bits of padding):</p>
<pre><code>$ od -t x4 bf.Blc
0000000 01a15144 02d55584 223070b7 00f032ff
0000020 7f85f9bf 956fe15e c0ee7d7f 006854e5
0000040 fbfd5558 fd5745e0 b6f0fbeb 07d62ff0
0000060 d7736fe1 c0bc14f1 1f2eff0b 17666fa1
0000100 2fef5be8 ff13ffcf 2034cae1 0bd0c80a
0000120 e51fee99 6a5a7fff ff0fff1f d0049d87
0000140 db0500ab 3bb74023 b0c0cc28 10740e6c
0000160</code></pre>
<pre><code> $ od -t x4 bf.Blc
0000000 01a15144 02d55584 223070b7 00f032ff
0000020 7f85f9bf 956fe15e c0ee7d7f 006854e5
0000040 fbfd5558 fd5745e0 b6f0fbeb 07d62ff0
0000060 d7736fe1 c0bc14f1 1f2eff0b 17666fa1
0000100 2fef5be8 ff13ffcf 2034cae1 0bd0c80a
0000120 e51fee99 6a5a7fff ff0fff1f d0049d87
0000140 db0500ab 3bb74023 b0c0cc28 10740e6c
0000160</code></pre>
<p>It expects its input to consist of a
<a href="https://en.wikipedia.org/wiki/Brainfuck">Brainfuck</a> program
(looking only at bits <code>0</code>, <code>1</code> and <code>4</code> to distinguish among <code>,-.+&lt;&gt;][</code>)
followed by a <code>]</code>, followed by the input for the Brainfuck program.</p>
<pre><code>$ more hw.bf
++++++++++[&gt;+++++++&gt;++++++++++&gt;+++&gt;+&lt;&lt;&lt;&lt;-]&gt;++.&gt;+.+++++++..+++.&gt;++.&lt;&lt;+++++++++++++++.&gt;.+++.------.--------.&gt;+.&gt;.]
$ cat bf.Blc hw.bf | ./tromp
Hello World!</code></pre>
<pre><code> $ more hw.bf
++++++++++[&gt;+++++++&gt;++++++++++&gt;+++&gt;+&lt;&lt;&lt;&lt;-]&gt;++.&gt;+.+++++++..+++.&gt;++.&lt;&lt;+++++++++++++++.&gt;.+++.------.--------.&gt;+.&gt;.]
$ cat bf.Blc hw.bf | ./tromp
Hello World!</code></pre>
<p>Curiously, the interpreter <code>bf.Blc</code> is the exact same size as <code>hw.bf</code>.</p>
<h3 id="a-blc-assembler">A BLC assembler</h3>
<p>Writing BLC programs can be made slightly less painful with this parser that
translates single-letter-variable lambda calculus into BLC:</p>
<div class="sourceCode" id="cb21"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb21-1"><a href="#cb21-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> echo <span class="st">&quot;\f\x f (f (f x))&quot;</span> <span class="op">&gt;</span> three</span>
<span id="cb21-2"><a href="#cb21-2" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> cat parse.Blc three <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb21-3"><a href="#cb21-3" aria-hidden="true" tabindex="-1"></a><span class="ex">000001110011100111010</span></span></code></pre></div>
<div class="sourceCode" id="cb21"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb21-1"><a href="#cb21-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo <span class="st">&quot;\f\x f (f (f x))&quot;</span> <span class="op">&gt;</span> three</span>
<span id="cb21-2"><a href="#cb21-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> cat parse.Blc three <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb21-3"><a href="#cb21-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">000001110011100111010</span></span></code></pre></div>
<h3 id="converting-between-bits-and-bytes">Converting between bits and bytes</h3>
<p>The program <code>inflate.Blc</code> and its inverse <code>deflate.Blc</code> allow us to translate between
BLC and BLC8. If you assemble a byte oriented program, you’ll need to compact it
into BLC8:</p>
<p>So we could assemble an input reversing program as</p>
<div class="sourceCode" id="cb22"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb22-1"><a href="#cb22-1" aria-hidden="true" tabindex="-1"></a><span class="bu">echo</span> <span class="st">&quot;\a a ((\b b b) (\b \c \d \e d (b b) (\f f c e))) (\b \c c)&quot;</span> <span class="op">&gt;</span> reverse</span>
<span id="cb22-2"><a href="#cb22-2" aria-hidden="true" tabindex="-1"></a><span class="fu">cat</span> parse.Blc reverse <span class="kw">|</span> <span class="ex">./tromp</span> <span class="op">&gt;</span> reverse.blc</span></code></pre></div>
<div class="sourceCode" id="cb22"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb22-1"><a href="#cb22-1" aria-hidden="true" tabindex="-1"></a> <span class="bu">echo</span> <span class="st">&quot;\a a ((\b b b) (\b \c \d \e d (b b) (\f f c e))) (\b \c c)&quot;</span> <span class="op">&gt;</span> reverse</span>
<span id="cb22-2"><a href="#cb22-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">cat</span> parse.Blc reverse <span class="kw">|</span> <span class="ex">./tromp</span> <span class="op">&gt;</span> reverse.blc</span></code></pre></div>
<p>and change it to BLC8 with</p>
<div class="sourceCode" id="cb23"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb23-1"><a href="#cb23-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> cat deflate.Blc reverse.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="op">&gt;</span> rev.Blc</span>
<span id="cb23-2"><a href="#cb23-2" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> wc rev.Blc</span>
<span id="cb23-3"><a href="#cb23-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">0</span> 1 9 rev.Blc</span></code></pre></div>
<div class="sourceCode" id="cb23"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb23-1"><a href="#cb23-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> cat deflate.Blc reverse.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="op">&gt;</span> rev.Blc</span>
<span id="cb23-2"><a href="#cb23-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> wc rev.Blc</span>
<span id="cb23-3"><a href="#cb23-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">0</span> 1 9 rev.Blc</span></code></pre></div>
<p>and then try it out with:</p>
<div class="sourceCode" id="cb24"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb24-1"><a href="#cb24-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> cat rev.Blc <span class="at">-</span> <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb24-2"><a href="#cb24-2" aria-hidden="true" tabindex="-1"></a><span class="ex">Hello,</span> world!</span>
<span id="cb24-3"><a href="#cb24-3" aria-hidden="true" tabindex="-1"></a><span class="ex">^D</span></span>
<span id="cb24-4"><a href="#cb24-4" aria-hidden="true" tabindex="-1"></a><span class="ex">!dlrow</span> ,olleH</span></code></pre></div>
<div class="sourceCode" id="cb24"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb24-1"><a href="#cb24-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> cat rev.Blc <span class="at">-</span> <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb24-2"><a href="#cb24-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">Hello,</span> world!</span>
<span id="cb24-3"><a href="#cb24-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">^D</span></span>
<span id="cb24-4"><a href="#cb24-4" aria-hidden="true" tabindex="-1"></a> <span class="ex">!dlrow</span> ,olleH</span></code></pre></div>
<h3 id="symbolic-lambda-calculus-reduction">Symbolic Lambda Calculus reduction</h3>
<p>BLC8 program <code>symbolic.Blc</code> shows individual reduction steps on symbolic lambda terms.
Here it is used to show the calculation of 2^3 in Church numerals:</p>
<div class="sourceCode" id="cb25"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb25-1"><a href="#cb25-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> echo <span class="st">&quot;(\f\x f (f (f x))) (\f\x f (f x))&quot;</span> <span class="op">&gt;</span> threetwo</span>
<span id="cb25-2"><a href="#cb25-2" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> cat parse.Blc threetwo <span class="kw">|</span> <span class="ex">./tromp</span> <span class="op">&gt;</span> threetwo.blc</span>
<span id="cb25-3"><a href="#cb25-3" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> cat symbolic.Blc threetwo.blc <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb25-4"><a href="#cb25-4" aria-hidden="true" tabindex="-1"></a><span class="kw">(</span><span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> b<span class="kw">)))</span> <span class="kw">(</span><span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> b<span class="kw">))</span></span>
<span id="cb25-5"><a href="#cb25-5" aria-hidden="true" tabindex="-1"></a><span class="ex">\a</span> <span class="er">(</span><span class="ex">\b</span> <span class="dt">\c</span> b <span class="er">(</span><span class="ex">b</span> c<span class="kw">))</span> <span class="kw">((</span><span class="ex">\b</span> <span class="dt">\c</span> b <span class="er">(</span><span class="ex">b</span> c<span class="kw">))</span> <span class="kw">((</span><span class="ex">\b</span> <span class="dt">\c</span> b <span class="er">(</span><span class="ex">b</span> c<span class="kw">))</span> <span class="ex">a</span><span class="kw">))</span></span>
<span id="cb25-6"><a href="#cb25-6" aria-hidden="true" tabindex="-1"></a><span class="ex">\a</span> <span class="dt">\b</span> <span class="er">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span><span class="kw">)</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span><span class="kw">)</span> <span class="ex">b</span><span class="kw">)</span></span>
<span id="cb25-7"><a href="#cb25-7" aria-hidden="true" tabindex="-1"></a><span class="ex">\a</span> <span class="dt">\b</span> <span class="er">(</span><span class="ex">\c</span> <span class="er">(</span><span class="ex">\d</span> <span class="dt">\e</span> d <span class="er">(</span><span class="ex">d</span> e<span class="kw">))</span> <span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\d</span> <span class="dt">\e</span> d <span class="er">(</span><span class="ex">d</span> e<span class="kw">))</span> <span class="ex">a</span> c<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span><span class="kw">)</span> <span class="ex">b</span><span class="kw">)</span></span>
<span id="cb25-8"><a href="#cb25-8" aria-hidden="true" tabindex="-1"></a><span class="ex">\a</span> <span class="dt">\b</span> <span class="er">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span><span class="kw">)</span> <span class="ex">b</span><span class="kw">))</span></span>
<span id="cb25-9"><a href="#cb25-9" aria-hidden="true" tabindex="-1"></a><span class="ex">\a</span> <span class="dt">\b</span> <span class="er">(</span><span class="ex">\c</span> a <span class="er">(</span><span class="ex">a</span> c<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span><span class="kw">)</span> <span class="ex">b</span><span class="kw">))</span></span>
<span id="cb25-10"><a href="#cb25-10" aria-hidden="true" tabindex="-1"></a><span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span><span class="kw">)</span> <span class="ex">b</span><span class="kw">)))</span></span>
<span id="cb25-11"><a href="#cb25-11" aria-hidden="true" tabindex="-1"></a><span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> a <span class="er">(</span><span class="ex">a</span> c<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span><span class="kw">)</span> <span class="ex">b</span><span class="kw">)))</span></span>
<span id="cb25-12"><a href="#cb25-12" aria-hidden="true" tabindex="-1"></a><span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span><span class="kw">)</span> <span class="ex">b</span><span class="kw">))))</span></span>
<span id="cb25-13"><a href="#cb25-13" aria-hidden="true" tabindex="-1"></a><span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="er">(</span><span class="ex">\d</span> <span class="dt">\e</span> d <span class="er">(</span><span class="ex">d</span> e<span class="kw">))</span> <span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\d</span> <span class="dt">\e</span> d <span class="er">(</span><span class="ex">d</span> e<span class="kw">))</span> <span class="ex">a</span> c<span class="kw">))</span> <span class="ex">b</span><span class="kw">))))</span></span>
<span id="cb25-14"><a href="#cb25-14" aria-hidden="true" tabindex="-1"></a><span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span> b<span class="kw">)))))</span></span>
<span id="cb25-15"><a href="#cb25-15" aria-hidden="true" tabindex="-1"></a><span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> a <span class="er">(</span><span class="ex">a</span> c<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span> b<span class="kw">)))))</span></span>
<span id="cb25-16"><a href="#cb25-16" aria-hidden="true" tabindex="-1"></a><span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span> b<span class="kw">))))))</span></span>
<span id="cb25-17"><a href="#cb25-17" aria-hidden="true" tabindex="-1"></a><span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> a <span class="er">(</span><span class="ex">a</span> c<span class="kw">))</span> <span class="ex">b</span><span class="kw">))))))</span></span>
<span id="cb25-18"><a href="#cb25-18" aria-hidden="true" tabindex="-1"></a><span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> b<span class="kw">)))))))</span></span></code></pre></div>
<div class="sourceCode" id="cb25"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb25-1"><a href="#cb25-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo <span class="st">&quot;(\f\x f (f (f x))) (\f\x f (f x))&quot;</span> <span class="op">&gt;</span> threetwo</span>
<span id="cb25-2"><a href="#cb25-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> cat parse.Blc threetwo <span class="kw">|</span> <span class="ex">./tromp</span> <span class="op">&gt;</span> threetwo.blc</span>
<span id="cb25-3"><a href="#cb25-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> cat symbolic.Blc threetwo.blc <span class="kw">|</span> <span class="ex">./tromp</span></span>
<span id="cb25-4"><a href="#cb25-4" aria-hidden="true" tabindex="-1"></a> <span class="kw">(</span><span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> b<span class="kw">)))</span> <span class="kw">(</span><span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> b<span class="kw">))</span></span>
<span id="cb25-5"><a href="#cb25-5" aria-hidden="true" tabindex="-1"></a> <span class="ex">\a</span> <span class="er">(</span><span class="ex">\b</span> <span class="dt">\c</span> b <span class="er">(</span><span class="ex">b</span> c<span class="kw">))</span> <span class="kw">((</span><span class="ex">\b</span> <span class="dt">\c</span> b <span class="er">(</span><span class="ex">b</span> c<span class="kw">))</span> <span class="kw">((</span><span class="ex">\b</span> <span class="dt">\c</span> b <span class="er">(</span><span class="ex">b</span> c<span class="kw">))</span> <span class="ex">a</span><span class="kw">))</span></span>
<span id="cb25-6"><a href="#cb25-6" aria-hidden="true" tabindex="-1"></a> <span class="ex">\a</span> <span class="dt">\b</span> <span class="er">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span><span class="kw">)</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span><span class="kw">)</span> <span class="ex">b</span><span class="kw">)</span></span>
<span id="cb25-7"><a href="#cb25-7" aria-hidden="true" tabindex="-1"></a> <span class="ex">\a</span> <span class="dt">\b</span> <span class="er">(</span><span class="ex">\c</span> <span class="er">(</span><span class="ex">\d</span> <span class="dt">\e</span> d <span class="er">(</span><span class="ex">d</span> e<span class="kw">))</span> <span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\d</span> <span class="dt">\e</span> d <span class="er">(</span><span class="ex">d</span> e<span class="kw">))</span> <span class="ex">a</span> c<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span><span class="kw">)</span> <span class="ex">b</span><span class="kw">)</span></span>
<span id="cb25-8"><a href="#cb25-8" aria-hidden="true" tabindex="-1"></a> <span class="ex">\a</span> <span class="dt">\b</span> <span class="er">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span><span class="kw">)</span> <span class="ex">b</span><span class="kw">))</span></span>
<span id="cb25-9"><a href="#cb25-9" aria-hidden="true" tabindex="-1"></a> <span class="ex">\a</span> <span class="dt">\b</span> <span class="er">(</span><span class="ex">\c</span> a <span class="er">(</span><span class="ex">a</span> c<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span><span class="kw">)</span> <span class="ex">b</span><span class="kw">))</span></span>
<span id="cb25-10"><a href="#cb25-10" aria-hidden="true" tabindex="-1"></a> <span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span><span class="kw">)</span> <span class="ex">b</span><span class="kw">)))</span></span>
<span id="cb25-11"><a href="#cb25-11" aria-hidden="true" tabindex="-1"></a> <span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> a <span class="er">(</span><span class="ex">a</span> c<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span><span class="kw">)</span> <span class="ex">b</span><span class="kw">)))</span></span>
<span id="cb25-12"><a href="#cb25-12" aria-hidden="true" tabindex="-1"></a> <span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span><span class="kw">)</span> <span class="ex">b</span><span class="kw">))))</span></span>
<span id="cb25-13"><a href="#cb25-13" aria-hidden="true" tabindex="-1"></a> <span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="er">(</span><span class="ex">\d</span> <span class="dt">\e</span> d <span class="er">(</span><span class="ex">d</span> e<span class="kw">))</span> <span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\d</span> <span class="dt">\e</span> d <span class="er">(</span><span class="ex">d</span> e<span class="kw">))</span> <span class="ex">a</span> c<span class="kw">))</span> <span class="ex">b</span><span class="kw">))))</span></span>
<span id="cb25-14"><a href="#cb25-14" aria-hidden="true" tabindex="-1"></a> <span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span> b<span class="kw">)))))</span></span>
<span id="cb25-15"><a href="#cb25-15" aria-hidden="true" tabindex="-1"></a> <span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> a <span class="er">(</span><span class="ex">a</span> c<span class="kw">))</span> <span class="kw">((</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span> b<span class="kw">)))))</span></span>
<span id="cb25-16"><a href="#cb25-16" aria-hidden="true" tabindex="-1"></a> <span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> c <span class="er">(</span><span class="ex">c</span> d<span class="kw">))</span> <span class="ex">a</span> b<span class="kw">))))))</span></span>
<span id="cb25-17"><a href="#cb25-17" aria-hidden="true" tabindex="-1"></a> <span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> a <span class="er">(</span><span class="ex">a</span> c<span class="kw">))</span> <span class="ex">b</span><span class="kw">))))))</span></span>
<span id="cb25-18"><a href="#cb25-18" aria-hidden="true" tabindex="-1"></a> <span class="ex">\a</span> <span class="dt">\b</span> a <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> <span class="er">(</span><span class="ex">a</span> b<span class="kw">)))))))</span></span></code></pre></div>
<p>As expected, the resulting normal form is <a href="https://en.wikipedia.org/wiki/Church_encoding">Church
numeral</a> 8.</p>
<p>Taking only the first line of output gives us a sort of BLC disassembler, an
exact inverse of the above assembler. The prime number sieve disassembles as
follows:</p>
<div class="sourceCode" id="cb26"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb26-1"><a href="#cb26-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> cat symbolic.Blc primes.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="kw">|</span> <span class="fu">head</span> <span class="at">-1</span></span>
<span id="cb26-2"><a href="#cb26-2" aria-hidden="true" tabindex="-1"></a><span class="ex">\a</span> <span class="er">(</span><span class="ex">\b</span> b <span class="er">(</span><span class="ex">b</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> c c<span class="kw">)</span> <span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> <span class="dt">\e</span> e <span class="er">(</span><span class="ex">\f</span> <span class="dt">\g</span> g<span class="kw">)</span> <span class="kw">((</span><span class="ex">\f</span> c c f <span class="er">(</span><span class="kw">(</span><span class="ex">\g</span> g g<span class="kw">)</span> <span class="kw">(</span><span class="ex">\g</span> f <span class="er">(</span><span class="ex">g</span> g<span class="kw">))))</span> <span class="kw">(</span><span class="ex">\f</span> <span class="dt">\g</span> <span class="dt">\h</span> <span class="dt">\i</span> i g <span class="er">(</span><span class="ex">h</span> <span class="er">(</span><span class="ex">d</span> f<span class="kw">)))))</span> <span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> <span class="dt">\e</span> b <span class="er">(</span><span class="ex">e</span> c<span class="kw">)))))</span> <span class="kw">(</span><span class="ex">\b</span> <span class="dt">\c</span> c <span class="er">(</span><span class="ex">\d</span> <span class="dt">\e</span> d<span class="kw">)</span> <span class="ex">b</span><span class="kw">)</span></span></code></pre></div>
<div class="sourceCode" id="cb26"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb26-1"><a href="#cb26-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> cat symbolic.Blc primes.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="kw">|</span> <span class="fu">head</span> <span class="at">-1</span></span>
<span id="cb26-2"><a href="#cb26-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">\a</span> <span class="er">(</span><span class="ex">\b</span> b <span class="er">(</span><span class="ex">b</span> <span class="er">(</span><span class="kw">(</span><span class="ex">\c</span> c c<span class="kw">)</span> <span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> <span class="dt">\e</span> e <span class="er">(</span><span class="ex">\f</span> <span class="dt">\g</span> g<span class="kw">)</span> <span class="kw">((</span><span class="ex">\f</span> c c f <span class="er">(</span><span class="kw">(</span><span class="ex">\g</span> g g<span class="kw">)</span> <span class="kw">(</span><span class="ex">\g</span> f <span class="er">(</span><span class="ex">g</span> g<span class="kw">))))</span> <span class="kw">(</span><span class="ex">\f</span> <span class="dt">\g</span> <span class="dt">\h</span> <span class="dt">\i</span> i g <span class="er">(</span><span class="ex">h</span> <span class="er">(</span><span class="ex">d</span> f<span class="kw">)))))</span> <span class="kw">(</span><span class="ex">\c</span> <span class="dt">\d</span> <span class="dt">\e</span> b <span class="er">(</span><span class="ex">e</span> c<span class="kw">)))))</span> <span class="kw">(</span><span class="ex">\b</span> <span class="dt">\c</span> c <span class="er">(</span><span class="ex">\d</span> <span class="dt">\e</span> d<span class="kw">)</span> <span class="ex">b</span><span class="kw">)</span></span></code></pre></div>
<p>Hardly any less obfuscated…</p>
<p>The last line of</p>
<div class="sourceCode" id="cb27"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb27-1"><a href="#cb27-1" aria-hidden="true" tabindex="-1"></a><span class="fu">cat</span> symbolic.Blc primes.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="kw">|</span> <span class="fu">head</span> <span class="at">-16</span></span></code></pre></div>
<div class="sourceCode" id="cb27"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb27-1"><a href="#cb27-1" aria-hidden="true" tabindex="-1"></a> <span class="fu">cat</span> symbolic.Blc primes.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="kw">|</span> <span class="fu">head</span> <span class="at">-16</span></span></code></pre></div>
<p>starts out as</p>
<pre><code>\a \b b (\c \d c) (\c c (\d \e d) (\d d (\e \f f) (\e e (\f \g g) ((\f (\g \h \i</code></pre>
<pre><code> \a \b b (\c \d c) (\c c (\d \e d) (\d d (\e \f f) (\e e (\f \g g) ((\f (\g \h \i</code></pre>
<p>The <code>\a</code> is for ignoring the rest of the input (to which the universal machine
applies the decoded lambda term). The <code>\b b (..) (...)</code> is the list constructor,
usually called <code>cons</code>, applied to a head (a list element) and a tail (another list).
@@ -445,16 +444,16 @@ Syntax</a> which relies on the highly optimized
Haskell runtime system for evaluation. Of course individual BLC programs running
under the interpreter perform much worse than that same program written in Haskell.</p>
<p>Our interpreter copes well with extra levels of interpretation:</p>
<div class="sourceCode" id="cb29"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb29-1"><a href="#cb29-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> time cat primes.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="at">-b</span> <span class="kw">|</span> <span class="fu">head</span> <span class="at">-c</span> 210 <span class="op">&gt;</span> /dev/null</span>
<span id="cb29-2"><a href="#cb29-2" aria-hidden="true" tabindex="-1"></a><span class="ex">real</span> 0m0.043s</span>
<span id="cb29-3"><a href="#cb29-3" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> time cat uni.blc primes.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="at">-b</span> <span class="kw">|</span> <span class="fu">head</span> <span class="at">-c</span> 210 <span class="op">&gt;</span> /dev/null</span>
<span id="cb29-4"><a href="#cb29-4" aria-hidden="true" tabindex="-1"></a><span class="ex">real</span> 0m0.191s</span>
<span id="cb29-5"><a href="#cb29-5" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> time cat uni.blc uni.blc primes.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="at">-b</span> <span class="kw">|</span> <span class="fu">head</span> <span class="at">-c</span> 210 <span class="op">&gt;</span> /dev/null</span>
<span id="cb29-6"><a href="#cb29-6" aria-hidden="true" tabindex="-1"></a><span class="ex">real</span> 0m1.919s</span>
<span id="cb29-7"><a href="#cb29-7" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> time cat uni.blc uni.blc uni.blc primes.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="at">-b</span> <span class="kw">|</span> <span class="fu">head</span> <span class="at">-c</span> 210 <span class="op">&gt;</span> /dev/null</span>
<span id="cb29-8"><a href="#cb29-8" aria-hidden="true" tabindex="-1"></a><span class="ex">real</span> 0m23.514s</span>
<span id="cb29-9"><a href="#cb29-9" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> time cat uni.blc uni.blc uni.blc uni.blc primes.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="at">-b</span> <span class="kw">|</span> <span class="fu">head</span> <span class="at">-c</span> 210 <span class="op">&gt;</span> /dev/null</span>
<span id="cb29-10"><a href="#cb29-10" aria-hidden="true" tabindex="-1"></a><span class="ex">real</span> 4m52.700s</span></code></pre></div>
<div class="sourceCode" id="cb29"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb29-1"><a href="#cb29-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> time cat primes.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="at">-b</span> <span class="kw">|</span> <span class="fu">head</span> <span class="at">-c</span> 210 <span class="op">&gt;</span> /dev/null</span>
<span id="cb29-2"><a href="#cb29-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">real</span> 0m0.043s</span>
<span id="cb29-3"><a href="#cb29-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> time cat uni.blc primes.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="at">-b</span> <span class="kw">|</span> <span class="fu">head</span> <span class="at">-c</span> 210 <span class="op">&gt;</span> /dev/null</span>
<span id="cb29-4"><a href="#cb29-4" aria-hidden="true" tabindex="-1"></a> <span class="ex">real</span> 0m0.191s</span>
<span id="cb29-5"><a href="#cb29-5" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> time cat uni.blc uni.blc primes.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="at">-b</span> <span class="kw">|</span> <span class="fu">head</span> <span class="at">-c</span> 210 <span class="op">&gt;</span> /dev/null</span>
<span id="cb29-6"><a href="#cb29-6" aria-hidden="true" tabindex="-1"></a> <span class="ex">real</span> 0m1.919s</span>
<span id="cb29-7"><a href="#cb29-7" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> time cat uni.blc uni.blc uni.blc primes.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="at">-b</span> <span class="kw">|</span> <span class="fu">head</span> <span class="at">-c</span> 210 <span class="op">&gt;</span> /dev/null</span>
<span id="cb29-8"><a href="#cb29-8" aria-hidden="true" tabindex="-1"></a> <span class="ex">real</span> 0m23.514s</span>
<span id="cb29-9"><a href="#cb29-9" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> time cat uni.blc uni.blc uni.blc uni.blc primes.blc <span class="kw">|</span> <span class="ex">./tromp</span> <span class="at">-b</span> <span class="kw">|</span> <span class="fu">head</span> <span class="at">-c</span> 210 <span class="op">&gt;</span> /dev/null</span>
<span id="cb29-10"><a href="#cb29-10" aria-hidden="true" tabindex="-1"></a> <span class="ex">real</span> 4m52.700s</span></code></pre></div>
<h3 id="obfuscation">Obfuscation</h3>
<p>Obfuscation is due entirely to conciseness. Some questions to ponder:</p>
<p>Which of the term space codes <code>0</code>, <code>1</code>, <code>2</code>, <code>3</code> serve multiple purposes?</p>
@@ -465,15 +464,15 @@ under the interpreter perform much worse than that same program written in Haske
<h3 id="portability">Portability</h3>
<p>The program freely (without casting) converts between <code>int</code> and <code>int *</code>, causing
many warnings;</p>
<pre><code> note: expected &#39;int *&#39; but argument is of type &#39;int&#39;
warning: assignment from incompatible pointer type
warning: assignment makes integer from pointer without a cast
warning: assignment makes pointer from integer without a cast
warning: incompatible implicit declaration of built-in function &#39;calloc&#39;
warning: incompatible implicit declaration of built-in function &#39;exit&#39;
warning: passing argument 1 of &#39;d&#39; makes pointer from integer without a cast
warning: passing argument 1 of &#39;p&#39; makes pointer from integer without a cast
warning: pointer/integer type mismatch in conditional expression</code></pre>
<pre><code> note: expected &#39;int *&#39; but argument is of type &#39;int&#39;
warning: assignment from incompatible pointer type
warning: assignment makes integer from pointer without a cast
warning: assignment makes pointer from integer without a cast
warning: incompatible implicit declaration of built-in function &#39;calloc&#39;
warning: incompatible implicit declaration of built-in function &#39;exit&#39;
warning: passing argument 1 of &#39;d&#39; makes pointer from integer without a cast
warning: passing argument 1 of &#39;p&#39; makes pointer from integer without a cast
warning: pointer/integer type mismatch in conditional expression</code></pre>
<p>Avoiding these would make the program substantially longer,
and detract from its single minded focus on conciseness.</p>
<p>It implicitly declares functions <code>read(2)</code>, <code>write(2)</code>, <code>exit(3)</code> and
2012/vik/README.md
+14 -14
View File
@@ -1,7 +1,7 @@
## To build:
```sh
make
make
```
This entry requires [Zlib](https://www.zlib.net).
@@ -15,7 +15,7 @@ code](#alternate-code) section below.
The current status of this entry is:
```
STATUS: INABIAF - please **DO NOT** fix
STATUS: INABIAF - please **DO NOT** fix
```
For more detailed information see [2012 vik bugs](../../bugs.html#2012_vik).
@@ -26,38 +26,38 @@ For more detailed information see [2012 vik bugs](../../bugs.html#2012_vik).
To embed text (from file or command line):
```sh
./vik e base.png filename > encodedimg.png
./vik e base.png filename > encodedimg.png
```
or
```sh
./vik e base.png SomeRandomText > encodedimg.png
./vik e base.png SomeRandomText > encodedimg.png
```
To extract the embedded text:
```sh
./vik d encodedimg.png
./vik d encodedimg.png
```
To embed a PNG into another:
```sh
./vik e base.png source.png > encodedimg.png
./vik e base.png source.png > encodedimg.png
```
To extract the embedded PNG:
```sh
./vik d encodedimg.png > restored.png
./vik d encodedimg.png > restored.png
```
## Try:
```sh
./try.sh
./try.sh
```
@@ -69,7 +69,7 @@ For those few who might use Windows this alternate code might work.
### Alternate build:
```sh
make alt
make alt
```
@@ -117,8 +117,8 @@ of the previous winning brainfuck interpreters, but I thought it would be easier
to include an interpreter in the program to avoid the hassle:
```sh
./vik e ioccc.png chocolate.png > encodedimg.png
./vik b encodedimg.png
./vik e ioccc.png chocolate.png > encodedimg.png
./vik b encodedimg.png
```
It is of course also possible to embed a
@@ -126,8 +126,8 @@ It is of course also possible to embed a
(as explained above) and decode it, e.g.:
```sh
./vik e ioccc.png .+[.+] > encodedimg.png
./vik b encodedimg.png
./vik e ioccc.png .+[.+] > encodedimg.png
./vik b encodedimg.png
```
### Obfuscation
@@ -155,7 +155,7 @@ the variable declarations in the main declaration in order to run
correctly:
```c
_setmode(_fileno(stdout), 0x8000);
_setmode(_fileno(stdout), 0x8000);
```
NOTE: this is what the [Alternate code](#alternate-code) does.
2012/vik/index.html
+15 -16
View File
@@ -132,8 +132,7 @@
<h2 id="author"><a name="author"></a>Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Daniel_Vik">Daniel Vik</a><br>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)
<br><br></li>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
</ul>
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -142,31 +141,31 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
<h2 id="to-build">To build:</h2>
<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>
<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>
<p>This entry requires <a href="https://www.zlib.net">Zlib</a>.</p>
<p>There is an alternate version which might work for Windows. See <a href="#alternate-code">Alternate
code</a> section below.</p>
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
<p>The current status of this entry is:</p>
<pre><code>STATUS: INABIAF - please **DO NOT** fix</code></pre>
<pre><code> STATUS: INABIAF - please **DO NOT** fix</code></pre>
<p>For more detailed information see <a href="../../bugs.html#2012_vik">2012 vik bugs</a>.</p>
<h2 id="to-use">To use:</h2>
<p>To embed text (from file or command line):</p>
<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">./vik</span> e base.png filename <span class="op">&gt;</span> encodedimg.png</span></code></pre></div>
<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">./vik</span> e base.png filename <span class="op">&gt;</span> encodedimg.png</span></code></pre></div>
<p>or</p>
<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">./vik</span> e base.png SomeRandomText <span class="op">&gt;</span> encodedimg.png</span></code></pre></div>
<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">./vik</span> e base.png SomeRandomText <span class="op">&gt;</span> encodedimg.png</span></code></pre></div>
<p>To extract the embedded text:</p>
<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="ex">./vik</span> d encodedimg.png</span></code></pre></div>
<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="ex">./vik</span> d encodedimg.png</span></code></pre></div>
<p>To embed a PNG into another:</p>
<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="ex">./vik</span> e base.png source.png <span class="op">&gt;</span> encodedimg.png</span></code></pre></div>
<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="ex">./vik</span> e base.png source.png <span class="op">&gt;</span> encodedimg.png</span></code></pre></div>
<p>To extract the embedded PNG:</p>
<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">./vik</span> d encodedimg.png <span class="op">&gt;</span> restored.png</span></code></pre></div>
<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">./vik</span> d encodedimg.png <span class="op">&gt;</span> restored.png</span></code></pre></div>
<h2 id="try">Try:</h2>
<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">./try.sh</span></span></code></pre></div>
<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">./try.sh</span></span></code></pre></div>
<h2 id="alternate-code">Alternate code:</h2>
<p>For those few who might use Windows this alternate code might work.</p>
<h3 id="alternate-build">Alternate build:</h3>
<div class="sourceCode" id="cb9"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span> alt</span></code></pre></div>
<div class="sourceCode" id="cb9"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a> <span class="fu">make</span> alt</span></code></pre></div>
<h3 id="alternate-use">Alternate use:</h3>
<p>Use <code>vik.alt</code> as you would <code>vik</code> above.</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
@@ -197,13 +196,13 @@ into another image and extracted, the bitmap data is also a valid
possible to get the bitmap data from the extracted image, and run it through any
of the previous winning brainfuck interpreters, but I thought it would be easier
to include an interpreter in the program to avoid the hassle:</p>
<div class="sourceCode" id="cb10"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./vik</span> e ioccc.png chocolate.png <span class="op">&gt;</span> encodedimg.png</span>
<span id="cb10-2"><a href="#cb10-2" aria-hidden="true" tabindex="-1"></a><span class="ex">./vik</span> b encodedimg.png</span></code></pre></div>
<div class="sourceCode" id="cb10"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./vik</span> e ioccc.png chocolate.png <span class="op">&gt;</span> encodedimg.png</span>
<span id="cb10-2"><a href="#cb10-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">./vik</span> b encodedimg.png</span></code></pre></div>
<p>It is of course also possible to embed a
<a href="https://en.wikipedia.org/wiki/Brainfuck">brainfuck</a> program as a text file
(as explained above) and decode it, e.g.:</p>
<div class="sourceCode" id="cb11"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./vik</span> e ioccc.png .+<span class="pp">[</span><span class="ss">.+</span><span class="pp">]</span> <span class="op">&gt;</span> encodedimg.png</span>
<span id="cb11-2"><a href="#cb11-2" aria-hidden="true" tabindex="-1"></a><span class="ex">./vik</span> b encodedimg.png</span></code></pre></div>
<div class="sourceCode" id="cb11"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./vik</span> e ioccc.png .+<span class="pp">[</span><span class="ss">.+</span><span class="pp">]</span> <span class="op">&gt;</span> encodedimg.png</span>
<span id="cb11-2"><a href="#cb11-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">./vik</span> b encodedimg.png</span></code></pre></div>
<h3 id="obfuscation">Obfuscation</h3>
<p>I really wanted to keep the program simple, so instead of adding multiple macros
or helper methods that can be confusing, I placed all functionality in the
@@ -222,7 +221,7 @@ binary data to <code>stdout</code>.</p>
compile the program on this platform, the following line can be added after
the variable declarations in the main declaration in order to run
correctly:</p>
<div class="sourceCode" id="cb12"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb12-1"><a href="#cb12-1" aria-hidden="true" tabindex="-1"></a>_setmode<span class="op">(</span>_fileno<span class="op">(</span>stdout<span class="op">),</span> <span class="bn">0x8000</span><span class="op">);</span></span></code></pre></div>
<div class="sourceCode" id="cb12"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb12-1"><a href="#cb12-1" aria-hidden="true" tabindex="-1"></a> _setmode<span class="op">(</span>_fileno<span class="op">(</span>stdout<span class="op">),</span> <span class="bn">0x8000</span><span class="op">);</span></span></code></pre></div>
<p>NOTE: this is what the <a href="#alternate-code">Alternate code</a> does.</p>
<h3 id="limitations">Limitations</h3>
<p>The program doesn’t have many error checks so passing in invalid arguments
2012/zeitak/README.md
+7 -7
View File
@@ -1,7 +1,7 @@
## To build:
```sh
make
make
```
There is an alternate version that is slightly deobfuscated. See [alternate
@@ -11,7 +11,7 @@ code](#alternate-code) below.
## To use:
```sh
./zeitak < file
./zeitak < file
```
where `file` is the file to be checked for nesting errors. For example, you may
@@ -22,7 +22,7 @@ text files that are not code.
## Try:
```sh
make test
make test
```
NOTE: the program prints an error and exits on the first nesting error so it
@@ -39,7 +39,7 @@ understand this extremely subtle entry.
### Alternate build:
```sh
make alt
make alt
```
@@ -61,7 +61,7 @@ just to understand _18 key **characters**_ of this code.
NOTE: if you use vim to view the code, make sure to do:
```
:set tabstop=4
:set tabstop=4
```
in command mode, before looking at the code, to see the correct layout.
@@ -93,7 +93,7 @@ around it's position.
will be detected in the following line:
```c
printf(")");
printf(")");
```
* Doesn't get confused by the [1984/anonymous](../../1984/anonymous/index.html) entry!
@@ -105,7 +105,7 @@ printf(")");
an error:
```c
printf("\"");
printf("\"");
```
#### Obfuscation
2012/zeitak/index.html
+8 -9
View File
@@ -132,8 +132,7 @@
<h2 id="author"><a name="author"></a>Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Adar_Zeitak">Adar Zeitak</a><br>
Location: <a href="../../location.html#IL">IL</a> - <em>State of Israel</em> (<em>Israel</em>)
<br><br></li>
Location: <a href="../../location.html#IL">IL</a> - <em>State of Israel</em> (<em>Israel</em>)</li>
</ul>
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -142,16 +141,16 @@ Location: <a href="../../location.html#IL">IL</a> - <em>State of Israel</em> (<e
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
<h2 id="to-build">To build:</h2>
<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>
<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>
<p>There is an alternate version that is slightly deobfuscated. See <a href="#alternate-code">alternate
code</a> below.</p>
<h2 id="to-use">To use:</h2>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./zeitak</span> <span class="op">&lt;</span> file</span></code></pre></div>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./zeitak</span> <span class="op">&lt;</span> file</span></code></pre></div>
<p>where <code>file</code> is the file to be checked for nesting errors. For example, you may
try <a href="incorrect.c">incorrect.c</a> and the program itself. You may also run it on
text files that are not code.</p>
<h2 id="try">Try:</h2>
<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="fu">make</span> test</span></code></pre></div>
<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="fu">make</span> test</span></code></pre></div>
<p>NOTE: the program prints an error and exits on the first nesting error so it
will not detect multiple issues.</p>
<h2 id="alternate-code">Alternate code:</h2>
@@ -159,7 +158,7 @@ will not detect multiple issues.</p>
deobfuscated by the author. You may find reading it helpful in your attempt to
understand this extremely subtle entry.</p>
<h3 id="alternate-build">Alternate build:</h3>
<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="fu">make</span> alt</span></code></pre></div>
<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="fu">make</span> alt</span></code></pre></div>
<h3 id="alternate-use">Alternate use:</h3>
<p>Use <code>zeitak.alt</code> as you would <code>zeitak</code> above.</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
@@ -170,7 +169,7 @@ At one point we spent
minutes</a>
just to understand <em>18 key <strong>characters</strong></em> of this code.</p>
<p>NOTE: if you use vim to view the code, make sure to do:</p>
<pre><code>:set tabstop=4</code></pre>
<pre><code> :set tabstop=4</code></pre>
<p>in command mode, before looking at the code, to see the correct layout.</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<h3 id="nesting-errors-detector">Nesting Errors Detector</h3>
@@ -189,7 +188,7 @@ around it’s position.</p>
<li>Ignores parenthesis inside strings or character constants, so no errors
will be detected in the following line:</li>
</ul>
<div class="sourceCode" id="cb6"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a>printf<span class="op">(</span><span class="st">&quot;)&quot;</span><span class="op">);</span></span></code></pre></div>
<div class="sourceCode" id="cb6"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a> printf<span class="op">(</span><span class="st">&quot;)&quot;</span><span class="op">);</span></span></code></pre></div>
<ul>
<li>Doesn’t get confused by the <a href="../../1984/anonymous/index.html">1984/anonymous</a> entry!</li>
</ul>
@@ -198,7 +197,7 @@ will be detected in the following line:</li>
<li>Escapes (e.g. <code>\"</code>) are ignored, so the following line will produce
an error:</li>
</ul>
<div class="sourceCode" id="cb7"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a>printf<span class="op">(</span><span class="st">&quot;</span><span class="sc">\&quot;</span><span class="st">&quot;</span><span class="op">);</span></span></code></pre></div>
<div class="sourceCode" id="cb7"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a> printf<span class="op">(</span><span class="st">&quot;</span><span class="sc">\&quot;</span><span class="st">&quot;</span><span class="op">);</span></span></code></pre></div>
<h4 id="obfuscation">Obfuscation</h4>
<p><a href="../../years.html">IOCCC entries</a> already contain entries without digits, control-flow
keywords and certain operators in their source. This entry has an