add hack-a-round for language specified markdown code blocks
When language is specified in a markdown code block such as:
````
```c
printf("Hello, world!\n");
```
````
is used, the resulting HTML as produced by `pandoc(1)` combined
with our revised `ioccc.css` is not intent the code block well.
A temporary "_hack-a-round_" is to turn the "markdown code language
specifier" into an HTML comment. For example:
````
```<!---c-->
printf("Hello, world!\n");
```
````
This commits turns off existing markdown code language specifiers
for now, while preserving our ability to restore them in the future
when a better "_hack-a-round_" to the "markdown code language
specifier" problem is found.
The HTML impact if this "_hack-a-round_" is to produce HTML that
looks like this:
```
<pre class="<!---c-->"><code> .. </code></pre>
```
We might be able to create a complex set of classes for each markdown
code language (there won't be very many) in `ioccc.css`, or we might
find a more general CSS (or maybe `pandoc(1)`?) solution.
For now, this hack-a-round will have to do.
This commit is contained in:
Landon Curt Noll committed
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@@ -417,9 +417,9 @@ own fix or suggest that they’re fixed!</p>
|
||||
<h3 id="information-1984decotindex.html">Information: <a href="1984/decot/index.html">1984/decot/index.html</a></h3>
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<p>The purpose of this program is to print out a string of rubbish. In particular
|
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you should see something like:</p>
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<div class="sourceCode" id="cb3"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> ./decot</span>
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<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a> <span class="st">'",x); /*</span></span>
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<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a><span class="st"> \</span></span></code></pre></div>
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<pre class="<!---sh-->"><code> $ ./decot
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'",x); /*
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\</code></pre>
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<p>without a newline after the <code>\</code>. This is not a bug.</p>
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<h2 id="mullender"><a name="1984_mullender"></a>1984/mullender</h2>
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<h3 id="status-inabiaf---please-do-not-fix-2">STATUS: INABIAF - please <strong>DO NOT</strong> fix</h3>
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@@ -479,7 +479,7 @@ operators like <code>/</code>. To see what operators are supported check the sou
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<p>With version 2 it sometimes segfaults even with the same input where other times
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it does not. We don’t believe this is because of the fix that lets some versions
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be compiled with clang. An example invocation is:</p>
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<div class="sourceCode" id="cb4"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./ver2</span> <span class="op"><</span> westley.c</span></code></pre></div>
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<pre class="<!---sh-->"><code> ./ver2 < westley.c</code></pre>
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<h3 id="a-useful-note-on-changingfixing-this-program">A useful note on changing/fixing this program</h3>
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<p>It should be noted that in additional to rot13 names there is code that is the
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reverse of other code (also wrt names). See the source file and the index.html
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@@ -511,12 +511,12 @@ the code. But it’s trickier than that as one might expect.</p>
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<p>The comments are processed too. Furthermore it happens that the last line
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becomes the first and the first line becomes the last! Now if you look at the
|
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code you’ll see on the first line:</p>
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<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="co">/**//*/};)/**/</span>pain<span class="op">(*</span><span class="co">//**/tang ,gnat/**//*/,ABBA~,0-0(avnz;)0-0,tang,raeN</span></span></code></pre></div>
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<pre class="<!---c-->"><code> /**//*/};)/**/pain(*//**/tang ,gnat/**//*/,ABBA~,0-0(avnz;)0-0,tang,raeN</code></pre>
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<p>In <code>ver0</code> it’ll be the same but the others are more interesting.</p>
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<p>In <code>ver1</code> you’ll see on the last line:</p>
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<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> cnva<span class="op">((</span>vag<span class="op">)</span>NOON<span class="op">&</span><span class="dv">2</span><span class="co">/*//*\\**/</span><span class="op">,</span>gnat<span class="op">,</span>tang <span class="op">,</span>NOON<span class="co">/**//*/(niam/**/</span><span class="op">);}</span><span class="co">/*//**/</span></span></code></pre></div>
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<pre class="<!---c-->"><code> cnva((vag)NOON&2/*//*\\**/,gnat,tang ,NOON/**//*/(niam/**/);}/*//**/</code></pre>
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<p>and on the first line:</p>
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<div class="sourceCode" id="cb8"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a> <span class="co">/**//*/};)/**/</span>cnva<span class="op">(*</span><span class="co">//**/gnat ,tang/**//*/,NOON~,0-0(niam;)0-0,gnat,enrA</span></span></code></pre></div>
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<pre class="<!---c-->"><code> /**//*/};)/**/cnva(*//**/gnat ,tang/**//*/,NOON~,0-0(niam;)0-0,gnat,enrA</code></pre>
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<p>Observe that the ROT13 of <code>pain</code> is <code>cnva</code> and the ROT13 of <code>main</code> is <code>znva</code>.
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The ROT13 of <code>NOON</code> is <code>ABBA</code>. <code>vag</code> is ROT13 of <code>int</code>, <code>gnat</code> and <code>tang</code> are
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ROT13 of each other as well which is the reverse of the original (this is not
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@@ -563,61 +563,61 @@ Enjoy! :-)</p>
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<p>A point worth considering is that as the number passed into the program gets
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bigger the number of lines of output gets substantially larger and it takes much
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more time and resources to run as well. For instance:</p>
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<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="ex">$</span> for n in <span class="va">$(</span><span class="fu">seq</span> 1 18<span class="va">)</span><span class="kw">;</span> <span class="cf">do</span> <span class="bu">echo</span> <span class="st">"</span><span class="va">$n</span><span class="st">"</span><span class="kw">;</span> <span class="bu">echo</span> <span class="st">"</span><span class="va">$n</span><span class="st">"</span> <span class="kw">|</span> <span class="bu">time</span> <span class="st">"./baruch"</span> <span class="kw">|</span> <span class="fu">wc</span> <span class="at">-l</span> <span class="kw">|</span> <span class="fu">sed</span> <span class="at">-E</span> <span class="at">-e</span> <span class="st">'s/[[:space:]]//g'</span><span class="kw">;</span> <span class="cf">done</span></span>
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<span id="cb9-2"><a href="#cb9-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">1</span></span>
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<span id="cb9-3"><a href="#cb9-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">3</span></span>
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<span id="cb9-4"><a href="#cb9-4" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 0.00s user 0.00s system 5% cpu 0.115 total</span>
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<span id="cb9-5"><a href="#cb9-5" aria-hidden="true" tabindex="-1"></a> <span class="ex">2</span></span>
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<span id="cb9-6"><a href="#cb9-6" aria-hidden="true" tabindex="-1"></a> <span class="ex">1</span></span>
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<span id="cb9-7"><a href="#cb9-7" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 0.00s user 0.00s system 64% cpu 0.004 total</span>
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<span id="cb9-8"><a href="#cb9-8" aria-hidden="true" tabindex="-1"></a> <span class="ex">3</span></span>
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<span id="cb9-9"><a href="#cb9-9" aria-hidden="true" tabindex="-1"></a> <span class="ex">1</span></span>
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<span id="cb9-10"><a href="#cb9-10" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 0.00s user 0.00s system 60% cpu 0.003 total</span>
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<span id="cb9-11"><a href="#cb9-11" aria-hidden="true" tabindex="-1"></a> <span class="ex">4</span></span>
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<span id="cb9-12"><a href="#cb9-12" aria-hidden="true" tabindex="-1"></a> <span class="ex">11</span></span>
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<span id="cb9-13"><a href="#cb9-13" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 0.00s user 0.00s system 64% cpu 0.003 total</span>
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<span id="cb9-14"><a href="#cb9-14" aria-hidden="true" tabindex="-1"></a> <span class="ex">5</span></span>
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<span id="cb9-15"><a href="#cb9-15" aria-hidden="true" tabindex="-1"></a> <span class="ex">61</span></span>
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<span id="cb9-16"><a href="#cb9-16" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 0.00s user 0.00s system 66% cpu 0.003 total</span>
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<span id="cb9-17"><a href="#cb9-17" aria-hidden="true" tabindex="-1"></a> <span class="ex">6</span></span>
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<span id="cb9-18"><a href="#cb9-18" aria-hidden="true" tabindex="-1"></a> <span class="ex">29</span></span>
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<span id="cb9-19"><a href="#cb9-19" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 0.00s user 0.00s system 61% cpu 0.003 total</span>
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<span id="cb9-20"><a href="#cb9-20" aria-hidden="true" tabindex="-1"></a> <span class="ex">7</span></span>
|
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<span id="cb9-21"><a href="#cb9-21" aria-hidden="true" tabindex="-1"></a> <span class="ex">321</span></span>
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<span id="cb9-22"><a href="#cb9-22" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 0.00s user 0.00s system 69% cpu 0.002 total</span>
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<span id="cb9-23"><a href="#cb9-23" aria-hidden="true" tabindex="-1"></a> <span class="ex">8</span></span>
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<span id="cb9-24"><a href="#cb9-24" aria-hidden="true" tabindex="-1"></a> <span class="ex">829</span></span>
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<span id="cb9-25"><a href="#cb9-25" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 0.00s user 0.00s system 76% cpu 0.003 total</span>
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<span id="cb9-26"><a href="#cb9-26" aria-hidden="true" tabindex="-1"></a> <span class="ex">9</span></span>
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<span id="cb9-27"><a href="#cb9-27" aria-hidden="true" tabindex="-1"></a> <span class="ex">3521</span></span>
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<span id="cb9-28"><a href="#cb9-28" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 0.00s user 0.00s system 87% cpu 0.005 total</span>
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<span id="cb9-29"><a href="#cb9-29" aria-hidden="true" tabindex="-1"></a> <span class="ex">10</span></span>
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<span id="cb9-30"><a href="#cb9-30" aria-hidden="true" tabindex="-1"></a> <span class="ex">7965</span></span>
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<span id="cb9-31"><a href="#cb9-31" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 0.01s user 0.00s system 95% cpu 0.014 total</span>
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<span id="cb9-32"><a href="#cb9-32" aria-hidden="true" tabindex="-1"></a> <span class="ex">11</span></span>
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<span id="cb9-33"><a href="#cb9-33" aria-hidden="true" tabindex="-1"></a> <span class="ex">32161</span></span>
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<span id="cb9-34"><a href="#cb9-34" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 0.05s user 0.00s system 98% cpu 0.053 total</span>
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<span id="cb9-35"><a href="#cb9-35" aria-hidden="true" tabindex="-1"></a> <span class="ex">12</span></span>
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<span id="cb9-36"><a href="#cb9-36" aria-hidden="true" tabindex="-1"></a> <span class="ex">184601</span></span>
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<span id="cb9-37"><a href="#cb9-37" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 0.29s user 0.00s system 99% cpu 0.294 total</span>
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<span id="cb9-38"><a href="#cb9-38" aria-hidden="true" tabindex="-1"></a> <span class="ex">13</span></span>
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<span id="cb9-39"><a href="#cb9-39" aria-hidden="true" tabindex="-1"></a> <span class="ex">1031969</span></span>
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<span id="cb9-40"><a href="#cb9-40" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 1.78s user 0.00s system 99% cpu 1.794 total</span>
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<span id="cb9-41"><a href="#cb9-41" aria-hidden="true" tabindex="-1"></a> <span class="ex">14</span></span>
|
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<span id="cb9-42"><a href="#cb9-42" aria-hidden="true" tabindex="-1"></a> <span class="ex">5483941</span></span>
|
||||
<span id="cb9-43"><a href="#cb9-43" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 11.26s user 0.02s system 99% cpu 11.311 total</span>
|
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<span id="cb9-44"><a href="#cb9-44" aria-hidden="true" tabindex="-1"></a> <span class="ex">15</span></span>
|
||||
<span id="cb9-45"><a href="#cb9-45" aria-hidden="true" tabindex="-1"></a> <span class="ex">36466945</span></span>
|
||||
<span id="cb9-46"><a href="#cb9-46" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 79.20s user 0.15s system 99% cpu 1:19.72 total</span>
|
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<span id="cb9-47"><a href="#cb9-47" aria-hidden="true" tabindex="-1"></a> <span class="ex">16</span></span>
|
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<span id="cb9-48"><a href="#cb9-48" aria-hidden="true" tabindex="-1"></a> <span class="ex">251132705</span></span>
|
||||
<span id="cb9-49"><a href="#cb9-49" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 592.89s user 0.77s system 99% cpu 9:55.34 total</span>
|
||||
<span id="cb9-50"><a href="#cb9-50" aria-hidden="true" tabindex="-1"></a> <span class="ex">17</span></span>
|
||||
<span id="cb9-51"><a href="#cb9-51" aria-hidden="true" tabindex="-1"></a> <span class="ex">1724671873</span></span>
|
||||
<span id="cb9-52"><a href="#cb9-52" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 4535.71s user 5.25s system 99% cpu 1:15:49.76 total</span>
|
||||
<span id="cb9-53"><a href="#cb9-53" aria-hidden="true" tabindex="-1"></a> <span class="ex">18</span></span>
|
||||
<span id="cb9-54"><a href="#cb9-54" aria-hidden="true" tabindex="-1"></a> <span class="ex">12655721857</span></span>
|
||||
<span id="cb9-55"><a href="#cb9-55" aria-hidden="true" tabindex="-1"></a> <span class="ex">./baruch</span> 37496.97s user 58.50s system 99% cpu 10:27:48.29 total</span></code></pre></div>
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<pre class="<!---sh-->"><code> $ for n in $(seq 1 18); do echo "$n"; echo "$n" | time "./baruch" | wc -l | sed -E -e 's/[[:space:]]//g'; done
|
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1
|
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3
|
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./baruch 0.00s user 0.00s system 5% cpu 0.115 total
|
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2
|
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1
|
||||
./baruch 0.00s user 0.00s system 64% cpu 0.004 total
|
||||
3
|
||||
1
|
||||
./baruch 0.00s user 0.00s system 60% cpu 0.003 total
|
||||
4
|
||||
11
|
||||
./baruch 0.00s user 0.00s system 64% cpu 0.003 total
|
||||
5
|
||||
61
|
||||
./baruch 0.00s user 0.00s system 66% cpu 0.003 total
|
||||
6
|
||||
29
|
||||
./baruch 0.00s user 0.00s system 61% cpu 0.003 total
|
||||
7
|
||||
321
|
||||
./baruch 0.00s user 0.00s system 69% cpu 0.002 total
|
||||
8
|
||||
829
|
||||
./baruch 0.00s user 0.00s system 76% cpu 0.003 total
|
||||
9
|
||||
3521
|
||||
./baruch 0.00s user 0.00s system 87% cpu 0.005 total
|
||||
10
|
||||
7965
|
||||
./baruch 0.01s user 0.00s system 95% cpu 0.014 total
|
||||
11
|
||||
32161
|
||||
./baruch 0.05s user 0.00s system 98% cpu 0.053 total
|
||||
12
|
||||
184601
|
||||
./baruch 0.29s user 0.00s system 99% cpu 0.294 total
|
||||
13
|
||||
1031969
|
||||
./baruch 1.78s user 0.00s system 99% cpu 1.794 total
|
||||
14
|
||||
5483941
|
||||
./baruch 11.26s user 0.02s system 99% cpu 11.311 total
|
||||
15
|
||||
36466945
|
||||
./baruch 79.20s user 0.15s system 99% cpu 1:19.72 total
|
||||
16
|
||||
251132705
|
||||
./baruch 592.89s user 0.77s system 99% cpu 9:55.34 total
|
||||
17
|
||||
1724671873
|
||||
./baruch 4535.71s user 5.25s system 99% cpu 1:15:49.76 total
|
||||
18
|
||||
12655721857
|
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./baruch 37496.97s user 58.50s system 99% cpu 10:27:48.29 total</code></pre>
|
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<h2 id="jaw"><a name="1990_jaw"></a>1990/jaw</h2>
|
||||
<h3 id="status-known-bug---please-help-us-fix-4">STATUS: known bug - please help us fix</h3>
|
||||
<h3 id="source-code-1990jawjaw.c">Source code: <a href="1990/jaw/jaw.c">1990/jaw/jaw.c</a></h3>
|
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@@ -627,19 +627,19 @@ fixed some issues in this program and <a href="../authors.html#Yusuke_Endoh">Yus
|
||||
Endoh</a> provided the <code>btoa</code>
|
||||
script but it appears there is a bug in this entry. The judges wrote that to
|
||||
test the entry one can do:</p>
|
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<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">"Quartz glyph jocks vend, fix, BMW."</span> <span class="kw">|</span> <span class="ex">compress</span> <span class="kw">|</span> <span class="ex">./btoa</span> <span class="kw">|</span> <span class="ex">./jaw</span></span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> echo "Quartz glyph jocks vend, fix, BMW." | compress | ./btoa | ./jaw</code></pre>
|
||||
<p>which should apply the identity transformation to a minimal holoalphabetic
|
||||
sentence.</p>
|
||||
<p>But doing this shows instead:</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="bu">echo</span> <span class="st">"Quartz glyph jocks vend, fix, BMW."</span> <span class="kw">|</span> <span class="ex">compress</span> <span class="kw">|</span> <span class="ex">./btoa</span> <span class="kw">|</span> <span class="ex">./jaw</span></span>
|
||||
<span id="cb11-2"><a href="#cb11-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">a얖?</span><span class="er">)</span><span class="ex">V...?????777??hC??h??-?</span> <span class="er">)</span><span class="ex">SSSSXXX????r?L=???*?-???ppp,,,?R</span></span>
|
||||
<span id="cb11-3"><a href="#cb11-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">?j</span></span>
|
||||
<span id="cb11-4"><a href="#cb11-4" aria-hidden="true" tabindex="-1"></a> <span class="ex">111-</span><span class="er">)))</span><span class="ex">?</span> <span class="st">'..F@E</span></span>
|
||||
<span id="cb11-5"><a href="#cb11-5" aria-hidden="true" tabindex="-1"></a><span class="st"> ???b111?</span></span>
|
||||
<span id="cb11-6"><a href="#cb11-6" aria-hidden="true" tabindex="-1"></a><span class="st"> ..F..F.?n,,,,,L@E$</span></span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> echo "Quartz glyph jocks vend, fix, BMW." | compress | ./btoa | ./jaw
|
||||
a얖?)V...?????777??hC??h??-? )SSSSXXX????r?L=???*?-???ppp,,,?R
|
||||
?j
|
||||
111-)))? '..F@E
|
||||
???b111?
|
||||
..F..F.?n,,,,,L@E$</code></pre>
|
||||
<p>Notice how there’s no newline at the end: that final <code>$</code> is the prompt.</p>
|
||||
<p>If one does, however:</p>
|
||||
<div class="sourceCode" id="cb12"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb12-1"><a href="#cb12-1" aria-hidden="true" tabindex="-1"></a> <span class="bu">echo</span> <span class="st">"Quartz glyph jocks vend, fix, BMW."</span> <span class="kw">|</span> <span class="ex">compress</span> <span class="kw">|</span> <span class="ex">./btoa</span> <span class="kw">|</span> <span class="ex">./jaw</span> <span class="kw">|</span> <span class="ex">./jaw</span></span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> echo "Quartz glyph jocks vend, fix, BMW." | compress | ./btoa | ./jaw | ./jaw</code></pre>
|
||||
<p>they will get just</p>
|
||||
<pre><code> oops</code></pre>
|
||||
<p>which seems to be an error message (one of the fixes was to make it not use
|
||||
@@ -697,7 +697,7 @@ or do something funny. For instance <code>adsleep</code> and <code>adbasename</c
|
||||
simple to fix but the author explicitly noted that this will segfault and it is
|
||||
that that is the error message.</p>
|
||||
<p>Another thing is that the code:</p>
|
||||
<div class="sourceCode" id="cb14"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb14-1"><a href="#cb14-1" aria-hidden="true" tabindex="-1"></a> printf<span class="op">((</span>W<span class="op">,</span>Y<span class="op">));</span></span></code></pre></div>
|
||||
<pre class="<!---c-->"><code> printf((W,Y));</code></pre>
|
||||
<p>appears to be wrong because <code>W</code> is a <code>FILE *</code> and <code>Y</code> is a <code>char[]</code> but if one
|
||||
changes it to use <code>fprintf()</code> on the file (which, incidentally, is opened in
|
||||
read only mode which is another reason) with the <code>%s</code> specifier it will make
|
||||
@@ -726,22 +726,22 @@ have to remove the outer <code>()</code> pair.</p>
|
||||
the first factor is 101 and is usually found in an instant.</code></pre>
|
||||
<p>A quick debugging session from Cody suggests that the problem with this value
|
||||
is that:</p>
|
||||
<div class="sourceCode" id="cb16"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb16-1"><a href="#cb16-1" aria-hidden="true" tabindex="-1"></a> <span class="cf">if</span> <span class="op">(</span> ppp<span class="op">-></span>qq<span class="op">!=</span><span class="dv">48</span> <span class="op">)</span> <span class="cf">return</span><span class="op">;</span></span></code></pre></div>
|
||||
<pre class="<!---c-->"><code> if ( ppp->qq!=48 ) return;</code></pre>
|
||||
<p>is never reached because the value is never 48 (it is in other cases but not for
|
||||
the example input). It varies in value at this point. Observe that the next
|
||||
lines of code are:</p>
|
||||
<div class="sourceCode" id="cb17"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb17-1"><a href="#cb17-1" aria-hidden="true" tabindex="-1"></a> <span class="cf">while</span> <span class="op">(</span> ppp<span class="op">-></span>qq<span class="op">==</span><span class="dv">48</span> <span class="op">)</span></span>
|
||||
<span id="cb17-2"><a href="#cb17-2" aria-hidden="true" tabindex="-1"></a> <span class="op">{</span></span>
|
||||
<span id="cb17-3"><a href="#cb17-3" aria-hidden="true" tabindex="-1"></a> printf<span class="op">(</span><span class="st">"</span><span class="sc">%ld\n</span><span class="st">"</span><span class="op">,</span>qqq<span class="op">-</span><span class="dv">45</span><span class="op">);</span></span>
|
||||
<span id="cb17-4"><a href="#cb17-4" aria-hidden="true" tabindex="-1"></a> <span class="op">*</span>pp <span class="op">=</span> ppp<span class="op">;</span></span>
|
||||
<span id="cb17-5"><a href="#cb17-5" aria-hidden="true" tabindex="-1"></a> ppp <span class="op">=</span> ppp<span class="op">-></span>p<span class="op">;</span></span>
|
||||
<span id="cb17-6"><a href="#cb17-6" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span></span></code></pre></div>
|
||||
<pre class="<!---c-->"><code> while ( ppp->qq==48 )
|
||||
{
|
||||
printf("%ld\n",qqq-45);
|
||||
*pp = ppp;
|
||||
ppp = ppp->p;
|
||||
}</code></pre>
|
||||
<p>so it is expected that that value is 48, before printing the numbers, but if
|
||||
it’s not it should not proceed at all, not even to go past that loop. In other
|
||||
words that loop should always be entered for at least one iteration. The check
|
||||
for the <code>!= 48</code> is also required.</p>
|
||||
<p>Perhaps more useful to know is that at this point in the code the code:</p>
|
||||
<div class="sourceCode" id="cb18"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb18-1"><a href="#cb18-1" aria-hidden="true" tabindex="-1"></a> <span class="cf">if</span> <span class="op">(((((</span> <span class="op">!(</span>aa<span class="op">=</span>setjmp<span class="op">(</span>ppp<span class="op">-></span>ppp<span class="op">))||</span>aa<span class="op">==</span>aaaaaa <span class="op">)))))</span></span></code></pre></div>
|
||||
<pre class="<!---c-->"><code> if ((((( !(aa=setjmp(ppp->ppp))||aa==aaaaaa )))))</code></pre>
|
||||
<p>appears to be entered because of the return value of <code>setjmp()</code>, not the other
|
||||
condition.</p>
|
||||
<p>The alt version does fix the problem but it is not obfuscated and not like the
|
||||
@@ -851,12 +851,12 @@ terminal columns is >= 80 it will display properly, rather than having to wra
|
||||
at 80 columns. However due to the nature of the program if the terminal is < 80
|
||||
in column width it will not display right. To see the number of columns in your
|
||||
terminal try:</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="va">$COLUMNS</span></span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> echo $COLUMNS</code></pre>
|
||||
<h3 id="status-known-bug---please-help-us-fix-7">STATUS: known bug - please help us fix</h3>
|
||||
<p>The author suggested that the alternate version, which Cody added (but fixed for
|
||||
modern systems), should print</p>
|
||||
<div class="sourceCode" id="cb23"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb23-1"><a href="#cb23-1" aria-hidden="true" tabindex="-1"></a> main<span class="op">(</span>l<span class="op">,</span>a<span class="op">,</span>n<span class="op">,</span>d<span class="op">)...</span></span>
|
||||
<span id="cb23-2"><a href="#cb23-2" aria-hidden="true" tabindex="-1"></a> <span class="op">[</span>A M E R I C A<span class="op">]...</span></span></code></pre></div>
|
||||
<pre class="<!---c-->"><code> main(l,a,n,d)...
|
||||
[A M E R I C A]...</code></pre>
|
||||
<p>…going down the left edge if your terminal auto-wraps at 80 characters.</p>
|
||||
<p>This however does not seem to work. It does not appear to be because of the fix
|
||||
for modern systems as it doesn’t work for gcc either, even before any changes.
|
||||
@@ -909,18 +909,18 @@ through ctrl-c or such.</p>
|
||||
fixed except for an exercise to yourself, should you wish to try.</p>
|
||||
<p>This program uses <code>system(3)</code> so if you provide invalid characters in the
|
||||
question you might cause an error. For instance don’t do this:</p>
|
||||
<div class="sourceCode" id="cb25"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb25-1"><a href="#cb25-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> ./schnitzi schnitzi.info</span>
|
||||
<span id="cb25-2"><a href="#cb25-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">This</span> program answers questions about paragraphs</span>
|
||||
<span id="cb25-3"><a href="#cb25-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">of</span> text posed to it in English. It is written</span>
|
||||
<span id="cb25-4"><a href="#cb25-4" aria-hidden="true" tabindex="-1"></a> <span class="er">in</span> <span class="ex">C.</span> Mark Schnitzius is the author of this</span>
|
||||
<span id="cb25-5"><a href="#cb25-5" aria-hidden="true" tabindex="-1"></a> <span class="ex">program.</span></span>
|
||||
<span id="cb25-6"><a href="#cb25-6" aria-hidden="true" tabindex="-1"></a></span>
|
||||
<span id="cb25-7"><a href="#cb25-7" aria-hidden="true" tabindex="-1"></a> <span class="ex">The</span> Loch Ness monster has been captured. Elvis</span>
|
||||
<span id="cb25-8"><a href="#cb25-8" aria-hidden="true" tabindex="-1"></a> <span class="ex">is</span> alive. Hostler was a woman. The NASA moon</span>
|
||||
<span id="cb25-9"><a href="#cb25-9" aria-hidden="true" tabindex="-1"></a> <span class="ex">landings</span> were clearly faked.</span>
|
||||
<span id="cb25-10"><a href="#cb25-10" aria-hidden="true" tabindex="-1"></a></span>
|
||||
<span id="cb25-11"><a href="#cb25-11" aria-hidden="true" tabindex="-1"></a></span>
|
||||
<span id="cb25-12"><a href="#cb25-12" aria-hidden="true" tabindex="-1"></a> <span class="ex">?</span> What is foo<span class="st">'?</span></span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> $ ./schnitzi schnitzi.info
|
||||
This program answers questions about paragraphs
|
||||
of text posed to it in English. It is written
|
||||
in C. Mark Schnitzius is the author of this
|
||||
program.
|
||||
|
||||
The Loch Ness monster has been captured. Elvis
|
||||
is alive. Hostler was a woman. The NASA moon
|
||||
landings were clearly faked.
|
||||
|
||||
|
||||
? What is foo'?</code></pre>
|
||||
<p>because doing so will result in something like:</p>
|
||||
<pre><code> sh: -c: line 0: unexpected EOF while looking for matching `''
|
||||
sh: -c: line 1: syntax error: unexpected end of file</code></pre>
|
||||
@@ -982,10 +982,10 @@ like getting to a place that the next contest can run must be done first.</p>
|
||||
how this entry works, which will be necessary if this entry is to be fixed,
|
||||
below.</p>
|
||||
<p>You might wish to run the command:</p>
|
||||
<div class="sourceCode" id="cb28"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb28-1"><a href="#cb28-1" aria-hidden="true" tabindex="-1"></a> <span class="fu">make</span> diff_orig_prog</span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> make diff_orig_prog</code></pre>
|
||||
<p>to see what had to change for the buffer size, when looking at the below.
|
||||
Furthermore you will want to look at:</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="fu">diff</span> schnitzi.alt.c schnitzi.alt2.c</span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> diff schnitzi.alt.c schnitzi.alt2.c</code></pre>
|
||||
<p>as the <code>fgets()</code> version can compile it just can’t generate compilable code (let
|
||||
alone using <code>fgets()</code>) when fed itself (to reiterate, just changing the call to
|
||||
<code>fgets(3)</code> does not mean it can compile and there’s a further problem in that
|
||||
@@ -1022,7 +1022,7 @@ o
|
||||
h
|
||||
></code></pre>
|
||||
<p>If you join the lines you end up with:</p>
|
||||
<div class="sourceCode" id="cb31"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb31-1"><a href="#cb31-1" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im"><stdio.h></span></span></code></pre></div>
|
||||
<pre class="<!---c-->"><code>#include <stdio.h></code></pre>
|
||||
<p>If you look at column 25 which is the end of the word ‘mh111’ and you go down to
|
||||
the next row you’ll see a 0 and if you go one row down another 0. This is the
|
||||
buffer size, 100, for <code>u</code>! The column to the left is the same for the <code>t</code>
|
||||
@@ -1041,7 +1041,7 @@ size but that only works on the original source.</p>
|
||||
<p>To say just how sensitive this entry is: even a space, lack of space or a
|
||||
character, wrong character, lack of character or character in the wrong place
|
||||
can cause a compilation error! Make sure that the output of:</p>
|
||||
<div class="sourceCode" id="cb32"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb32-1"><a href="#cb32-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./schnitzi</span> <span class="op"><</span> schnitzi.c</span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> ./schnitzi < schnitzi.c</code></pre>
|
||||
<p>can be compiled and the output of that new program when fed itself can also be
|
||||
compiled!</p>
|
||||
<h2 id="shapiro"><a name="1994_shapiro"></a>1994/shapiro</h2>
|
||||
@@ -1100,12 +1100,12 @@ it calls <code>getchar()</code> via the pointer <code>m</code>. So this is a fea
|
||||
<h3 id="source-code-1995leoleo.c">Source code: <a href="1995/leo/leo.c">1995/leo/leo.c</a></h3>
|
||||
<h3 id="information-1995leoindex.html">Information: <a href="1995/leo/index.html">1995/leo/index.html</a></h3>
|
||||
<p>The judges suggested that the following commands should result in output:</p>
|
||||
<div class="sourceCode" id="cb34"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb34-1"><a href="#cb34-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./leo</span> 1 <span class="kw">|</span> <span class="fu">cat</span> <span class="at">-</span> /dev/tty <span class="kw">|</span> <span class="fu">gs</span> <span class="at">-</span></span>
|
||||
<span id="cb34-2"><a href="#cb34-2" aria-hidden="true" tabindex="-1"></a></span>
|
||||
<span id="cb34-3"><a href="#cb34-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">./leo</span> 37 80 <span class="kw">|</span> <span class="fu">cat</span> <span class="at">-</span> /dev/tty <span class="kw">|</span> <span class="fu">gs</span> <span class="at">-</span></span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> ./leo 1 | cat - /dev/tty | gs -
|
||||
|
||||
./leo 37 80 | cat - /dev/tty | gs -</code></pre>
|
||||
<p>The first one can work if one does instead:</p>
|
||||
<div class="sourceCode" id="cb35"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb35-1"><a href="#cb35-1" aria-hidden="true" tabindex="-1"></a> <span class="bu">echo</span> <span class="st">""</span> <span class="kw">|</span> <span class="ex">./leo</span> 1 <span class="op">></span> foo.ps</span>
|
||||
<span id="cb35-2"><a href="#cb35-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">gs</span> foo.ps</span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> echo "" | ./leo 1 > foo.ps
|
||||
gs foo.ps</code></pre>
|
||||
<p>but it is supposed to work in the pipeline as is. The second one does not appear
|
||||
to work at all even if one redirects to a file (like the workaround for the
|
||||
first) as it appears to just block.</p>
|
||||
@@ -1140,28 +1140,28 @@ it was instead requiring a login / password.</p>
|
||||
almost be done except that some of the output of the
|
||||
<a href="1996/huffman/try.sh">try.sh</a> is wrong, especially the last one.</p>
|
||||
<p>This diff almost does it but not quite:</p>
|
||||
<div class="sourceCode" id="cb36"><pre class="sourceCode diff"><code class="sourceCode diff"><span id="cb36-1"><a href="#cb36-1" aria-hidden="true" tabindex="-1"></a> diff --git i/1996/huffman/huffman.c w/1996/huffman/huffman.c</span>
|
||||
<span id="cb36-2"><a href="#cb36-2" aria-hidden="true" tabindex="-1"></a> index a5745bc7f4fa28b834c004f4cf19633e40ad9165..5e5e5334f33f9dbd95c70eddece3189d9bcff5e9 100644</span>
|
||||
<span id="cb36-3"><a href="#cb36-3" aria-hidden="true" tabindex="-1"></a> --- i/1996/huffman/huffman.c</span>
|
||||
<span id="cb36-4"><a href="#cb36-4" aria-hidden="true" tabindex="-1"></a> +++ w/1996/huffman/huffman.c</span>
|
||||
<span id="cb36-5"><a href="#cb36-5" aria-hidden="true" tabindex="-1"></a> @@ -1,15 +1,16 @@</span>
|
||||
<span id="cb36-6"><a href="#cb36-6" aria-hidden="true" tabindex="-1"></a> #define x char</span>
|
||||
<span id="cb36-7"><a href="#cb36-7" aria-hidden="true" tabindex="-1"></a> #define z else</span>
|
||||
<span id="cb36-8"><a href="#cb36-8" aria-hidden="true" tabindex="-1"></a> #define w gets</span>
|
||||
<span id="cb36-9"><a href="#cb36-9" aria-hidden="true" tabindex="-1"></a> +#define gets(b) ((b)[0]='\0',(fgets((b), 100, stdin)))</span>
|
||||
<span id="cb36-10"><a href="#cb36-10" aria-hidden="true" tabindex="-1"></a> #define r if</span>
|
||||
<span id="cb36-11"><a href="#cb36-11" aria-hidden="true" tabindex="-1"></a> #define u int</span>
|
||||
<span id="cb36-12"><a href="#cb36-12" aria-hidden="true" tabindex="-1"></a> #define s main</span>
|
||||
<span id="cb36-13"><a href="#cb36-13" aria-hidden="true" tabindex="-1"></a> #define v putchar</span>
|
||||
<span id="cb36-14"><a href="#cb36-14" aria-hidden="true" tabindex="-1"></a> #define y while</span>
|
||||
<span id="cb36-15"><a href="#cb36-15" aria-hidden="true" tabindex="-1"></a> #define t " A?B?K?L?CIF?MSP?E?H?O?R?DJG?NTQ?????U?V?????X???????Z????W??Y??"</span>
|
||||
<span id="cb36-16"><a href="#cb36-16" aria-hidden="true" tabindex="-1"></a> - s ( ) { x* c , b[ 5 * 72 ]; u a, e , d [ 9</span>
|
||||
<span id="cb36-17"><a href="#cb36-17" aria-hidden="true" tabindex="-1"></a> + s ( ) { x* c , b[ 5 * 72 ]; u a, e , d [ 9</span>
|
||||
<span id="cb36-18"><a href="#cb36-18" aria-hidden="true" tabindex="-1"></a> *9 *9 ] ; y (w ( b) ){ r ( 0 [ b] -7 *</span>
|
||||
<span id="cb36-19"><a href="#cb36-19" aria-hidden="true" tabindex="-1"></a> 5 ) { c = b ; y ( (* c - 6</span>
|
||||
<span id="cb36-20"><a href="#cb36-20" aria-hidden="true" tabindex="-1"></a> * 7 )* * c )c = c+ 1 ; r (( -0 ) [ c ] && w ( b +</span>
|
||||
<span id="cb36-21"><a href="#cb36-21" aria-hidden="true" tabindex="-1"></a> 8 * 5* 3 ) && w (b +8 *5 * 6) )</span>
|
||||
<span id="cb36-22"><a href="#cb36-22" aria-hidden="true" tabindex="-1"></a> { a = 0; y ( a [ b ]</span></code></pre></div>
|
||||
<pre class="<!---diff-->"><code> diff --git i/1996/huffman/huffman.c w/1996/huffman/huffman.c
|
||||
index a5745bc7f4fa28b834c004f4cf19633e40ad9165..5e5e5334f33f9dbd95c70eddece3189d9bcff5e9 100644
|
||||
--- i/1996/huffman/huffman.c
|
||||
+++ w/1996/huffman/huffman.c
|
||||
@@ -1,15 +1,16 @@
|
||||
#define x char
|
||||
#define z else
|
||||
#define w gets
|
||||
+#define gets(b) ((b)[0]='\0',(fgets((b), 100, stdin)))
|
||||
#define r if
|
||||
#define u int
|
||||
#define s main
|
||||
#define v putchar
|
||||
#define y while
|
||||
#define t " A?B?K?L?CIF?MSP?E?H?O?R?DJG?NTQ?????U?V?????X???????Z????W??Y??"
|
||||
- s ( ) { x* c , b[ 5 * 72 ]; u a, e , d [ 9
|
||||
+ s ( ) { x* c , b[ 5 * 72 ]; u a, e , d [ 9
|
||||
*9 *9 ] ; y (w ( b) ){ r ( 0 [ b] -7 *
|
||||
5 ) { c = b ; y ( (* c - 6
|
||||
* 7 )* * c )c = c+ 1 ; r (( -0 ) [ c ] && w ( b +
|
||||
8 * 5* 3 ) && w (b +8 *5 * 6) )
|
||||
{ a = 0; y ( a [ b ]</code></pre>
|
||||
<p>But since it does not for the time being it is advisable to just redirect
|
||||
<code>stderr</code> to <code>/dev/null</code> (<code>2>/dev/null</code>).</p>
|
||||
<h2 id="jonth"><a name="1996_jonth"></a>1996/jonth</h2>
|
||||
@@ -1199,8 +1199,8 @@ to the page as well! You’ll have IOCCC fame for reviving a pootifier! :-)</p>
|
||||
<h3 id="information-1998schnitziindex.html">Information: <a href="1998/schnitzi/index.html">1998/schnitzi/index.html</a></h3>
|
||||
<p>A point worth considering is that as the number passed into the program gets
|
||||
bigger the number of lines of output gets substantially larger. For instance:</p>
|
||||
<div class="sourceCode" id="cb37"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb37-1"><a href="#cb37-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> ./schnitzi 9<span class="kw">|</span><span class="fu">wc</span> <span class="at">-l</span></span>
|
||||
<span id="cb37-2"><a href="#cb37-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">771999</span></span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> $ ./schnitzi 9|wc -l
|
||||
771999</code></pre>
|
||||
<p>The larger the number the bigger the file can become too, even becoming
|
||||
gigabytes in size. The range is checked for <code>>0 && <27</code> as not having this can
|
||||
be a problem including a segfault.</p>
|
||||
@@ -1215,43 +1215,43 @@ is in the index.html file as something to try and ponder.</p>
|
||||
<h3 id="source-code-2000dlowedlowe.c">Source code: <a href="2000/dlowe/dlowe.c">2000/dlowe/dlowe.c</a></h3>
|
||||
<h3 id="information-2000dloweindex.html">Information: <a href="2000/dlowe/index.html">2000/dlowe/index.html</a></h3>
|
||||
<p>The author gives an example command:</p>
|
||||
<div class="sourceCode" id="cb38"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb38-1"><a href="#cb38-1" aria-hidden="true" tabindex="-1"></a> <span class="bu">echo</span> <span class="st">"7 P 6 d P P 8 p"</span> <span class="kw">|</span> <span class="ex">./dlowe</span> <span class="kw">|</span> <span class="fu">tr</span> 876 tpo</span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> echo "7 P 6 d P P 8 p" | ./dlowe | tr 876 tpo</code></pre>
|
||||
<p>which should print out <code>poot</code> but it doesn’t, not in linux and not in macOS.</p>
|
||||
<p>In linux it doesn’t crash but it doesn’t print anything out either.</p>
|
||||
<p>In macOS it crashes; it might appear to not crash in macOS but this is because
|
||||
of the pipeline. If you remove the <code>| tr 876 tpo</code> part of the command you will
|
||||
see that it does indeed crash!</p>
|
||||
<p>The reason for this not working is really strange.</p>
|
||||
<div class="sourceCode" id="cb39"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb39-1"><a href="#cb39-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo <span class="st">"7 P 6 d P P 8 p"</span> <span class="kw">|</span> <span class="ex">./dlowe</span></span>
|
||||
<span id="cb39-2"><a href="#cb39-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">7668</span></span>
|
||||
<span id="cb39-3"><a href="#cb39-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo <span class="st">"7 P 6 d P P 8 p"</span> <span class="kw">|</span> <span class="ex">./dlowe</span> <span class="kw">|</span> <span class="fu">grep</span> 7</span>
|
||||
<span id="cb39-4"><a href="#cb39-4" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span></span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> $ echo "7 P 6 d P P 8 p" | ./dlowe
|
||||
7668
|
||||
$ echo "7 P 6 d P P 8 p" | ./dlowe | grep 7
|
||||
$</code></pre>
|
||||
<p>Why? Is it writing to stdout? Let’s try some other things:</p>
|
||||
<div class="sourceCode" id="cb40"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb40-1"><a href="#cb40-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo 7668 <span class="kw">|</span> <span class="fu">tr</span> 876 tpo</span>
|
||||
<span id="cb40-2"><a href="#cb40-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">poot</span></span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> $ echo 7668 | tr 876 tpo
|
||||
poot</code></pre>
|
||||
<p>Okay so we know that it SHOULD work. But we also know something funny is going on with stdout and the entry. Another experiment:</p>
|
||||
<div class="sourceCode" id="cb41"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb41-1"><a href="#cb41-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo <span class="st">"7 P 6 d P P 8 p"</span> <span class="kw">|</span> <span class="ex">./dlowe</span> <span class="dv">1</span><span class="op">>&</span><span class="dv">2</span> <span class="kw">|</span> <span class="fu">grep</span> 7</span>
|
||||
<span id="cb41-2"><a href="#cb41-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">7668</span></span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> $ echo "7 P 6 d P P 8 p" | ./dlowe 1>&2 | grep 7
|
||||
7668</code></pre>
|
||||
<p>Okay so now it sees it, <code>grep</code>. But watch!</p>
|
||||
<div class="sourceCode" id="cb42"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb42-1"><a href="#cb42-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo <span class="st">"7 P 6 d P P 8 p"</span> <span class="kw">|</span> <span class="ex">./dlowe</span> <span class="dv">2</span><span class="op">></span>foo <span class="dv">1</span><span class="op">>&</span><span class="dv">1</span></span>
|
||||
<span id="cb42-2"><a href="#cb42-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">7668</span></span>
|
||||
<span id="cb42-3"><a href="#cb42-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> cat foo</span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> $ echo "7 P 6 d P P 8 p" | ./dlowe 2>foo 1>&1
|
||||
7668
|
||||
$ cat foo</code></pre>
|
||||
<p>.. so at this hour it does appear to be writing to stdout but yet somehow it doesn’t? But watch:</p>
|
||||
<div class="sourceCode" id="cb43"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb43-1"><a href="#cb43-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo <span class="st">"7 P 6 d P P 8 p"</span> <span class="kw">|</span> <span class="ex">./dlowe</span> <span class="dv">1</span><span class="op">></span>foo <span class="dv">1</span><span class="op">>&</span><span class="dv">1</span></span>
|
||||
<span id="cb43-2"><a href="#cb43-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> cat foo</span>
|
||||
<span id="cb43-3"><a href="#cb43-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span></span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> $ echo "7 P 6 d P P 8 p" | ./dlowe 1>foo 1>&1
|
||||
$ cat foo
|
||||
$</code></pre>
|
||||
<p>Well this explains why the <code>tr</code> does not transliterate it to <code>poot</code> but why is
|
||||
this happening? Why can’t it be redirected to another file even?</p>
|
||||
<p>If it could be figured out why it’s not writing to stdout and yet at the same
|
||||
time is writing to stdout one bug could be fixed. Maybe it’s the perl messing
|
||||
with things but we don’t know.</p>
|
||||
<p>Other commands do work, however, and give the appropriate output, such as:</p>
|
||||
<div class="sourceCode" id="cb44"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb44-1"><a href="#cb44-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo 1 2 + p <span class="kw">|</span> <span class="ex">./dlowe</span></span>
|
||||
<span id="cb44-2"><a href="#cb44-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">3</span></span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> $ echo 1 2 + p | ./dlowe
|
||||
3</code></pre>
|
||||
<p>so something is wrong with some commands/operators.</p>
|
||||
<p>Another feature that does work in linux is:</p>
|
||||
<div class="sourceCode" id="cb45"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb45-1"><a href="#cb45-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo poot <span class="kw">|</span> <span class="ex">./dlowe</span></span>
|
||||
<span id="cb45-2"><a href="#cb45-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">poot</span> was here!</span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> $ echo poot | ./dlowe
|
||||
poot was here!</code></pre>
|
||||
<p>Can you help fix these problems?</p>
|
||||
<p>Cody provided the C code that creates an unformatted perl script that will just
|
||||
print ‘unimplemented’ for operators but it seems to work in some other ways (see
|
||||
@@ -1259,29 +1259,29 @@ below for how to go further than unimplemented) which is the exact perl from the
|
||||
C program except that it has the <code>#!/usr/bin/env perl</code> and <code>use warnings;</code> as
|
||||
well. A note below might suggest that doing this creates incomplete perl.
|
||||
Anyway:</p>
|
||||
<div class="sourceCode" id="cb46"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb46-1"><a href="#cb46-1" aria-hidden="true" tabindex="-1"></a> <span class="pp">#include </span><span class="im"><stdio.h></span></span>
|
||||
<span id="cb46-2"><a href="#cb46-2" aria-hidden="true" tabindex="-1"></a> <span class="dt">int</span> main<span class="op">(</span><span class="dt">void</span><span class="op">)</span></span>
|
||||
<span id="cb46-3"><a href="#cb46-3" aria-hidden="true" tabindex="-1"></a> <span class="op">{</span></span>
|
||||
<span id="cb46-4"><a href="#cb46-4" aria-hidden="true" tabindex="-1"></a> printf<span class="op">(</span><span class="st">"#!/usr/bin/env perl</span><span class="sc">\n</span><span class="st">use warnings;_:$_= <> ; defined or exit; @ARGV"</span></span>
|
||||
<span id="cb46-5"><a href="#cb46-5" aria-hidden="true" tabindex="-1"></a> <span class="st">"=split; __:$_= shift;defined or goto _; chomp "</span></span>
|
||||
<span id="cb46-6"><a href="#cb46-6" aria-hidden="true" tabindex="-1"></a> <span class="st">";(m*^</span><span class="sc">\\</span><span class="st">x70oO"</span> <span class="st">"</span><span class="sc">\\</span><span class="st">x74$*i)?(pri"</span> <span class="st">"nt </span><span class="sc">\"</span><span class="st">$_ w</span><span class="sc">\\</span><span class="st">x"</span></span>
|
||||
<span id="cb46-7"><a href="#cb46-7" aria-hidden="true" tabindex="-1"></a> <span class="st">"61s h</span><span class="sc">\\</span><span class="st">145r</span><span class="sc">\\</span><span class="st">x"</span> <span class="st">"65!</span><span class="sc">\\</span><span class="st">n</span><span class="sc">\"</span><span class="st">):((m*"</span> <span class="st">"^</span><span class="sc">\\</span><span class="st">s</span><span class="sc">\\</span><span class="st">*(-?</span><span class="sc">\\</span><span class="st">d+"</span></span>
|
||||
<span id="cb46-8"><a href="#cb46-8" aria-hidden="true" tabindex="-1"></a> <span class="st">"(</span><span class="sc">\\</span><span class="st">.</span><span class="sc">\\</span><span class="st">d+)?)</span><span class="sc">\\</span><span class="st">s"</span> <span class="st">"</span><span class="sc">\\</span><span class="st">*$*)?(push@SS ,$1):(&{chr(((o"</span></span>
|
||||
<span id="cb46-9"><a href="#cb46-9" aria-hidden="true" tabindex="-1"></a> <span class="st">"rd)</span><span class="sc">%%</span><span class="st">39)+3**4)x2 } )); goto __; sub ff { @SS= ("</span></span>
|
||||
<span id="cb46-10"><a href="#cb46-10" aria-hidden="true" tabindex="-1"></a> <span class="st">")} sub __{print </span><span class="sc">\"</span><span class="st">stack empty</span><span class="sc">\\</span><span class="st">"</span> <span class="st">"n</span><span class="sc">\"</span><span class="st">} sub ss{$#"</span></span>
|
||||
<span id="cb46-11"><a href="#cb46-11" aria-hidden="true" tabindex="-1"></a> <span class="st">"SS<0 and goto & __; print $SS[$"</span> <span class="st">"#SS].</span><span class="sc">\"\\</span><span class="st">n</span><span class="sc">\"</span><span class="st">} "</span></span>
|
||||
<span id="cb46-12"><a href="#cb46-12" aria-hidden="true" tabindex="-1"></a> <span class="st">"sub SS{ $#SS<0 and goto &__ ; print pop @SS}"</span></span>
|
||||
<span id="cb46-13"><a href="#cb46-13" aria-hidden="true" tabindex="-1"></a> <span class="st">"sub _ { print </span><span class="sc">\"</span><span class="st">divide by zer"</span> <span class="st">"o</span><span class="sc">\\</span><span class="st">n</span><span class="sc">\"</span><span class="st">}sub ii{"</span></span>
|
||||
<span id="cb46-14"><a href="#cb46-14" aria-hidden="true" tabindex="-1"></a> <span class="st">"map{ print</span><span class="sc">\"</span><span class="st">$_"</span> <span class="st">"</span><span class="sc">\\</span><span class="st">n</span><span class="sc">\"</span><span class="st"> } reverse @SS} sub AUTOLO"</span></span>
|
||||
<span id="cb46-15"><a href="#cb46-15" aria-hidden="true" tabindex="-1"></a> <span class="st">"AD { print</span><span class="sc">\"</span><span class="st">un"</span> <span class="st">"implemented</span><span class="sc">\\</span><span class="st">n"</span> <span class="st">"</span><span class="sc">\"</span><span class="st">} sub gg{ $#"</span></span>
|
||||
<span id="cb46-16"><a href="#cb46-16" aria-hidden="true" tabindex="-1"></a> <span class="st">"SS<0 and goto &__;push@SS,$SS[ $#SS]} sub uu{ "</span></span>
|
||||
<span id="cb46-17"><a href="#cb46-17" aria-hidden="true" tabindex="-1"></a> <span class="st">"$#SS<1 and goto &__;$SS[ $#SS]+= $SS[$#SS-1];$SS"</span></span>
|
||||
<span id="cb46-18"><a href="#cb46-18" aria-hidden="true" tabindex="-1"></a> <span class="st">"[$#SS-1]=$SS[$"</span> <span class="st">"#SS]-$SS[$#SS-"</span> <span class="st">"1]; $SS[$#SS]-"</span></span>
|
||||
<span id="cb46-19"><a href="#cb46-19" aria-hidden="true" tabindex="-1"></a> <span class="st">"=$SS[$#SS-1]}"</span><span class="op">);</span></span>
|
||||
<span id="cb46-20"><a href="#cb46-20" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span></span></code></pre></div>
|
||||
<pre class="<!---c-->"><code> #include <stdio.h>
|
||||
int main(void)
|
||||
{
|
||||
printf("#!/usr/bin/env perl\nuse warnings;_:$_= <> ; defined or exit; @ARGV"
|
||||
"=split; __:$_= shift;defined or goto _; chomp "
|
||||
";(m*^\\x70oO" "\\x74$*i)?(pri" "nt \"$_ w\\x"
|
||||
"61s h\\145r\\x" "65!\\n\"):((m*" "^\\s\\*(-?\\d+"
|
||||
"(\\.\\d+)?)\\s" "\\*$*)?(push@SS ,$1):(&{chr(((o"
|
||||
"rd)%%39)+3**4)x2 } )); goto __; sub ff { @SS= ("
|
||||
")} sub __{print \"stack empty\\" "n\"} sub ss{$#"
|
||||
"SS<0 and goto & __; print $SS[$" "#SS].\"\\n\"} "
|
||||
"sub SS{ $#SS<0 and goto &__ ; print pop @SS}"
|
||||
"sub _ { print \"divide by zer" "o\\n\"}sub ii{"
|
||||
"map{ print\"$_" "\\n\" } reverse @SS} sub AUTOLO"
|
||||
"AD { print\"un" "implemented\\n" "\"} sub gg{ $#"
|
||||
"SS<0 and goto &__;push@SS,$SS[ $#SS]} sub uu{ "
|
||||
"$#SS<1 and goto &__;$SS[ $#SS]+= $SS[$#SS-1];$SS"
|
||||
"[$#SS-1]=$SS[$" "#SS]-$SS[$#SS-" "1]; $SS[$#SS]-"
|
||||
"=$SS[$#SS-1]}");
|
||||
}</code></pre>
|
||||
<p>Compiling this you can generate:</p>
|
||||
<div class="sourceCode" id="cb47"><pre class="sourceCode perl"><code class="sourceCode perl"><span id="cb47-1"><a href="#cb47-1" aria-hidden="true" tabindex="-1"></a> <span class="co">#!/usr/bin/env perl</span></span>
|
||||
<span id="cb47-2"><a href="#cb47-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">use</span> <span class="kw">warnings</span>;_:<span class="wa">$_</span>= <> ; <span class="fu">defined</span> <span class="ot">or</span> <span class="fu">exit</span>; <span class="wa">@ARGV</span>=<span class="fu">split</span>; __:<span class="wa">$_</span>= <span class="fu">shift</span>;<span class="fu">defined</span> <span class="ot">or</span> <span class="fu">goto</span> _; <span class="fu">chomp</span> ;(<span class="ot">m*</span><span class="ch">^</span><span class="wa">\x70</span><span class="ot">oO</span><span class="wa">\x74$*</span><span class="ot">i</span><span class="ch">)?(</span><span class="ot">print "</span><span class="wa">$_</span><span class="ot"> w</span><span class="wa">\x61</span><span class="ot">s h</span><span class="wa">\145</span><span class="ot">r</span><span class="wa">\x65</span><span class="ot">!</span><span class="bn">\n</span><span class="ot">"</span><span class="ch">)</span><span class="ot">:</span><span class="ch">((</span><span class="ot">m</span><span class="ch">*^</span><span class="bn">\s</span><span class="ot">\*</span><span class="ch">(</span><span class="ot">-</span><span class="ch">?</span><span class="bn">\d</span><span class="ch">+(</span><span class="ot">\.</span><span class="bn">\d</span><span class="ch">+)?)</span><span class="bn">\s</span><span class="ot">\*</span><span class="wa">$*</span><span class="ch">)?(</span><span class="ot">push</span><span class="dt">@SS</span><span class="ot"> ,</span><span class="wa">$1</span><span class="ch">)</span><span class="ot">:</span><span class="ch">(</span><span class="ot">&{chr</span><span class="ch">(((</span><span class="ot">ord</span><span class="ch">)</span><span class="ot">%39</span><span class="ch">)+</span><span class="ot">3</span><span class="ch">**</span><span class="ot">4</span><span class="ch">)</span><span class="ot">x2 } </span><span class="ch">))</span><span class="ot">; goto __; sub ff { </span><span class="dt">@SS</span><span class="ot">= </span><span class="ch">()</span><span class="ot">} sub __{print "stack empty</span><span class="bn">\n</span><span class="ot">"} sub ss{</span><span class="dt">$#SS</span><span class="ot"><0 and goto & __; print </span><span class="dt">$SS</span><span class="ch">[</span><span class="bn">$#SS</span><span class="ch">]</span><span class="ot">."</span><span class="bn">\n</span><span class="ot">"} sub SS{ </span><span class="dt">$#SS</span><span class="ot"><0 and goto &__ ; print pop </span><span class="dt">@SS</span><span class="ot">}sub _ { print "divide by zero</span><span class="bn">\n</span><span class="ot">"}sub ii{map{ print"</span><span class="wa">$_</span><span class="bn">\n</span><span class="ot">" } reverse </span><span class="dt">@SS</span><span class="ot">} sub AUTOLOAD { print"unimplemented</span><span class="bn">\n</span><span class="ot">"} sub gg{ </span><span class="dt">$#SS</span><span class="ot"><0 and goto &__;push</span><span class="dt">@SS</span><span class="ot">,</span><span class="dt">$SS</span><span class="ch">[</span><span class="bn"> $#SS</span><span class="ch">]</span><span class="ot">} sub uu{ </span><span class="dt">$#SS</span><span class="ot"><1 and goto &__;</span><span class="dt">$SS</span><span class="ch">[</span><span class="bn"> $#SS</span><span class="ch">]+</span><span class="ot">= </span><span class="dt">$SS</span><span class="ch">[</span><span class="bn">$#SS-1</span><span class="ch">]</span><span class="ot">;</span><span class="dt">$SS</span><span class="ch">[</span><span class="bn">$#SS-1</span><span class="ch">]</span><span class="ot">=</span><span class="dt">$SS</span><span class="ch">[</span><span class="bn">$#SS</span><span class="ch">]</span><span class="ot">-</span><span class="dt">$SS</span><span class="ch">[</span><span class="bn">$#SS-1</span><span class="ch">]</span><span class="ot">; </span><span class="dt">$SS</span><span class="ch">[</span><span class="bn">$#SS</span><span class="ch">]</span><span class="ot">-=</span><span class="dt">$SS</span><span class="ch">[</span><span class="bn">$#SS-1</span><span class="ch">]</span><span class="ot">}</span></span></code></pre></div>
|
||||
<pre class="<!---perl-->"><code> #!/usr/bin/env perl
|
||||
use warnings;_:$_= <> ; defined or exit; @ARGV=split; __:$_= shift;defined or goto _; chomp ;(m*^\x70oO\x74$*i)?(print "$_ w\x61s h\145r\x65!\n"):((m*^\s\*(-?\d+(\.\d+)?)\s\*$*)?(push@SS ,$1):(&{chr(((ord)%39)+3**4)x2 } )); goto __; sub ff { @SS= ()} sub __{print "stack empty\n"} sub ss{$#SS<0 and goto & __; print $SS[$#SS]."\n"} sub SS{ $#SS<0 and goto &__ ; print pop @SS}sub _ { print "divide by zero\n"}sub ii{map{ print"$_\n" } reverse @SS} sub AUTOLOAD { print"unimplemented\n"} sub gg{ $#SS<0 and goto &__;push@SS,$SS[ $#SS]} sub uu{ $#SS<1 and goto &__;$SS[ $#SS]+= $SS[$#SS-1];$SS[$#SS-1]=$SS[$#SS]-$SS[$#SS-1]; $SS[$#SS]-=$SS[$#SS-1]}</code></pre>
|
||||
<p>Here is example input/output:</p>
|
||||
<pre><code> p
|
||||
stack empty
|
||||
@@ -1298,32 +1298,32 @@ Anyway:</p>
|
||||
how this does not happen in the C program in linux!) but if one uses ‘p’ by
|
||||
itself it will print what’s on the stack (for example).</p>
|
||||
<p>To not get ‘unimplemented’ you can remove from the perl:</p>
|
||||
<div class="sourceCode" id="cb49"><pre class="sourceCode perl"><code class="sourceCode perl"><span id="cb49-1"><a href="#cb49-1" aria-hidden="true" tabindex="-1"></a> <span class="kw">sub </span><span class="fu">AUTOLOAD</span> { print<span class="ot">"</span><span class="st">unimplemented</span><span class="ch">\n</span><span class="ot">"</span>}</span></code></pre></div>
|
||||
<pre class="<!---perl-->"><code> sub AUTOLOAD { print"unimplemented\n"}</code></pre>
|
||||
<p>(Note that the author stated this was used for exception handling so another
|
||||
possibility is that the C code doesn’t generate the correct perl and indeed even
|
||||
spaces is known to break the perl in at least one way, syntax errors, but maybe
|
||||
others too.)</p>
|
||||
<p>Here is an example run of several operations in the perl script after removing
|
||||
that subroutine:</p>
|
||||
<div class="sourceCode" id="cb50"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb50-1"><a href="#cb50-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo 5 5 p <span class="kw">|</span> <span class="ex">./dlowe.pl</span></span>
|
||||
<span id="cb50-2"><a href="#cb50-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">5</span></span>
|
||||
<span id="cb50-3"><a href="#cb50-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo 5 5 + p <span class="kw">|</span> <span class="ex">./dlowe.pl</span></span>
|
||||
<span id="cb50-4"><a href="#cb50-4" aria-hidden="true" tabindex="-1"></a> <span class="ex">5</span></span>
|
||||
<span id="cb50-5"><a href="#cb50-5" aria-hidden="true" tabindex="-1"></a> <span class="ex">Undefined</span> subroutine <span class="kw">&</span><span class="ex">main::UU</span> called at ./pl.pl line 2, <span class="op"><></span> line 1.</span>
|
||||
<span id="cb50-6"><a href="#cb50-6" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo 5 5 <span class="pp">*</span> p <span class="kw">|</span> <span class="ex">./dlowe.pl</span></span>
|
||||
<span id="cb50-7"><a href="#cb50-7" aria-hidden="true" tabindex="-1"></a> <span class="ex">5</span></span>
|
||||
<span id="cb50-8"><a href="#cb50-8" aria-hidden="true" tabindex="-1"></a> <span class="ex">Undefined</span> subroutine <span class="kw">&</span><span class="ex">main::ww</span> called at ./pl.pl line 2, <span class="op"><></span> line 1.</span>
|
||||
<span id="cb50-9"><a href="#cb50-9" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo 5 5 <span class="at">-</span> p <span class="kw">|</span> <span class="ex">./dlowe.pl</span></span>
|
||||
<span id="cb50-10"><a href="#cb50-10" aria-hidden="true" tabindex="-1"></a> <span class="ex">5</span></span>
|
||||
<span id="cb50-11"><a href="#cb50-11" aria-hidden="true" tabindex="-1"></a> <span class="ex">Undefined</span> subroutine <span class="kw">&</span><span class="ex">main::WW</span> called at ./pl.pl line 2, <span class="op"><></span> line 1.</span>
|
||||
<span id="cb50-12"><a href="#cb50-12" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo 5 5 / p <span class="kw">|</span> <span class="ex">./dlowe.pl</span></span>
|
||||
<span id="cb50-13"><a href="#cb50-13" aria-hidden="true" tabindex="-1"></a> <span class="ex">5</span></span>
|
||||
<span id="cb50-14"><a href="#cb50-14" aria-hidden="true" tabindex="-1"></a> <span class="ex">Undefined</span> subroutine <span class="kw">&</span><span class="ex">main::YY</span> called at ./pl.pl line 2, <span class="op"><></span> line 1.</span>
|
||||
<span id="cb50-15"><a href="#cb50-15" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo 5 P <span class="kw">|</span> <span class="ex">./dlowe.pl</span></span>
|
||||
<span id="cb50-16"><a href="#cb50-16" aria-hidden="true" tabindex="-1"></a> <span class="ex">5$</span> echo p <span class="kw">|</span> <span class="ex">./dlowe.pl</span></span>
|
||||
<span id="cb50-17"><a href="#cb50-17" aria-hidden="true" tabindex="-1"></a> <span class="ex">stack</span> empty</span>
|
||||
<span id="cb50-18"><a href="#cb50-18" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo P <span class="kw">|</span> <span class="ex">./dlowe.pl</span></span>
|
||||
<span id="cb50-19"><a href="#cb50-19" aria-hidden="true" tabindex="-1"></a> <span class="ex">stack</span> empty</span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> $ echo 5 5 p | ./dlowe.pl
|
||||
5
|
||||
$ echo 5 5 + p | ./dlowe.pl
|
||||
5
|
||||
Undefined subroutine &main::UU called at ./pl.pl line 2, <> line 1.
|
||||
$ echo 5 5 * p | ./dlowe.pl
|
||||
5
|
||||
Undefined subroutine &main::ww called at ./pl.pl line 2, <> line 1.
|
||||
$ echo 5 5 - p | ./dlowe.pl
|
||||
5
|
||||
Undefined subroutine &main::WW called at ./pl.pl line 2, <> line 1.
|
||||
$ echo 5 5 / p | ./dlowe.pl
|
||||
5
|
||||
Undefined subroutine &main::YY called at ./pl.pl line 2, <> line 1.
|
||||
$ echo 5 P | ./dlowe.pl
|
||||
5$ echo p | ./dlowe.pl
|
||||
stack empty
|
||||
$ echo P | ./dlowe.pl
|
||||
stack empty</code></pre>
|
||||
<p>Note the undefined subroutine error: that happens with commands that are not
|
||||
even in the program. Again the author used <code>AUTOLOAD</code> for exception handling so
|
||||
it seems likely that there is something missing (which the below shows as well).
|
||||
@@ -1336,9 +1336,9 @@ works in the code, at least in some cases.</p>
|
||||
invalid input. But as can be seen by the input I (Cody) gave the input is not
|
||||
actually incorrect. It is also curious to note that it ends up printing what’s
|
||||
on the stack at that point:</p>
|
||||
<div class="sourceCode" id="cb52"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb52-1"><a href="#cb52-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo 5 5 + p <span class="kw">|</span> <span class="ex">./dlowe.pl</span></span>
|
||||
<span id="cb52-2"><a href="#cb52-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">unimplemented</span></span>
|
||||
<span id="cb52-3"><a href="#cb52-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">5</span></span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> $ echo 5 5 + p | ./dlowe.pl
|
||||
unimplemented
|
||||
5</code></pre>
|
||||
<p>which might (?) suggest that the <code>+</code> operator is unimplemented. Unfortunately it
|
||||
has been many years since I have used perl and I was never a guru either.</p>
|
||||
<h3 id="status-inabiaf---please-do-not-fix-25">STATUS: INABIAF - please <strong>DO NOT</strong> fix</h3>
|
||||
@@ -1346,34 +1346,34 @@ has been many years since I have used perl and I was never a guru either.</p>
|
||||
they said is in <code>Perl_sv_upgrade</code>. As this is documented it is not considered a
|
||||
bug to be fixed. For the curious this will crash in macOS. Cody notes that the
|
||||
code that crashes is:</p>
|
||||
<div class="sourceCode" id="cb53"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb53-1"><a href="#cb53-1" aria-hidden="true" tabindex="-1"></a> perl_eval_sv</span>
|
||||
<span id="cb53-2"><a href="#cb53-2" aria-hidden="true" tabindex="-1"></a> <span class="op">(</span>newSVpv<span class="op">(</span><span class="st">"_:$_= <> ; defined or exit; @ARGV"</span></span>
|
||||
<span id="cb53-3"><a href="#cb53-3" aria-hidden="true" tabindex="-1"></a> <span class="st">"=split; __:$_= shift;defined or goto _; chomp "</span></span>
|
||||
<span id="cb53-4"><a href="#cb53-4" aria-hidden="true" tabindex="-1"></a> <span class="st">";(m*^</span><span class="sc">\\</span><span class="st">x70oO"</span> <span class="st">"</span><span class="sc">\\</span><span class="st">x74$*i)?(pri"</span> <span class="st">"nt </span><span class="sc">\"</span><span class="st">$_ w</span><span class="sc">\\</span><span class="st">x"</span></span>
|
||||
<span id="cb53-5"><a href="#cb53-5" aria-hidden="true" tabindex="-1"></a> <span class="st">"61s h</span><span class="sc">\\</span><span class="st">145r</span><span class="sc">\\</span><span class="st">x"</span> <span class="st">"65!</span><span class="sc">\\</span><span class="st">n</span><span class="sc">\"</span><span class="st">):((m*"</span> <span class="st">"^</span><span class="sc">\\</span><span class="st">s</span><span class="sc">\\</span><span class="st">*(-?</span><span class="sc">\\</span><span class="st">d+"</span></span>
|
||||
<span id="cb53-6"><a href="#cb53-6" aria-hidden="true" tabindex="-1"></a> <span class="st">"(</span><span class="sc">\\</span><span class="st">.</span><span class="sc">\\</span><span class="st">d+)?)</span><span class="sc">\\</span><span class="st">s"</span> <span class="st">"</span><span class="sc">\\</span><span class="st">*$*)?(push@SS ,$1):(&{chr(((o"</span></span>
|
||||
<span id="cb53-7"><a href="#cb53-7" aria-hidden="true" tabindex="-1"></a> <span class="st">"rd)%39)+3**4)x2 } )); goto __; sub ff { @SS= ("</span></span>
|
||||
<span id="cb53-8"><a href="#cb53-8" aria-hidden="true" tabindex="-1"></a> <span class="st">")} sub __{print </span><span class="sc">\"</span><span class="st">stack empty</span><span class="sc">\\</span><span class="st">"</span> <span class="st">"n</span><span class="sc">\"</span><span class="st">} sub ss{$#"</span></span>
|
||||
<span id="cb53-9"><a href="#cb53-9" aria-hidden="true" tabindex="-1"></a> <span class="st">"SS<0 and goto & __; print $SS[$"</span> <span class="st">"#SS].</span><span class="sc">\"\\</span><span class="st">n</span><span class="sc">\"</span><span class="st">} "</span></span>
|
||||
<span id="cb53-10"><a href="#cb53-10" aria-hidden="true" tabindex="-1"></a> <span class="st">"sub SS{ $#SS<0 and goto &__ ; print pop @SS}"</span></span>
|
||||
<span id="cb53-11"><a href="#cb53-11" aria-hidden="true" tabindex="-1"></a> <span class="st">"sub _ { print </span><span class="sc">\"</span><span class="st">divide by zer"</span> <span class="st">"o</span><span class="sc">\\</span><span class="st">n</span><span class="sc">\"</span><span class="st">}sub ii{"</span></span>
|
||||
<span id="cb53-12"><a href="#cb53-12" aria-hidden="true" tabindex="-1"></a> <span class="st">"map{ print</span><span class="sc">\"</span><span class="st">$_"</span> <span class="st">"</span><span class="sc">\\</span><span class="st">n</span><span class="sc">\"</span><span class="st"> } reverse @SS} sub AUTOLO"</span></span>
|
||||
<span id="cb53-13"><a href="#cb53-13" aria-hidden="true" tabindex="-1"></a> <span class="st">"AD { print</span><span class="sc">\"</span><span class="st">un"</span> <span class="st">"implemented</span><span class="sc">\\</span><span class="st">n"</span> <span class="st">"</span><span class="sc">\"</span><span class="st">} sub gg{ $#"</span></span>
|
||||
<span id="cb53-14"><a href="#cb53-14" aria-hidden="true" tabindex="-1"></a> <span class="st">"SS<0 and goto &__;push@SS,$SS[ $#SS]} sub uu{ "</span></span>
|
||||
<span id="cb53-15"><a href="#cb53-15" aria-hidden="true" tabindex="-1"></a> <span class="st">"$#SS<1 and goto &__;$SS[ $#SS]+= $SS[$#SS-1];$SS"</span></span>
|
||||
<span id="cb53-16"><a href="#cb53-16" aria-hidden="true" tabindex="-1"></a> <span class="st">"[$#SS-1]=$SS[$"</span> <span class="st">"#SS]-$SS[$#SS-"</span> <span class="st">"1]; $SS[$#SS]-"</span></span>
|
||||
<span id="cb53-17"><a href="#cb53-17" aria-hidden="true" tabindex="-1"></a> <span class="st">"=$SS[$#SS-1]} "</span><span class="op">,</span><span class="dv">0</span><span class="op">),</span><span class="dv">0</span> <span class="op">);</span></span></code></pre></div>
|
||||
<pre class="<!---c-->"><code> perl_eval_sv
|
||||
(newSVpv("_:$_= <> ; defined or exit; @ARGV"
|
||||
"=split; __:$_= shift;defined or goto _; chomp "
|
||||
";(m*^\\x70oO" "\\x74$*i)?(pri" "nt \"$_ w\\x"
|
||||
"61s h\\145r\\x" "65!\\n\"):((m*" "^\\s\\*(-?\\d+"
|
||||
"(\\.\\d+)?)\\s" "\\*$*)?(push@SS ,$1):(&{chr(((o"
|
||||
"rd)%39)+3**4)x2 } )); goto __; sub ff { @SS= ("
|
||||
")} sub __{print \"stack empty\\" "n\"} sub ss{$#"
|
||||
"SS<0 and goto & __; print $SS[$" "#SS].\"\\n\"} "
|
||||
"sub SS{ $#SS<0 and goto &__ ; print pop @SS}"
|
||||
"sub _ { print \"divide by zer" "o\\n\"}sub ii{"
|
||||
"map{ print\"$_" "\\n\" } reverse @SS} sub AUTOLO"
|
||||
"AD { print\"un" "implemented\\n" "\"} sub gg{ $#"
|
||||
"SS<0 and goto &__;push@SS,$SS[ $#SS]} sub uu{ "
|
||||
"$#SS<1 and goto &__;$SS[ $#SS]+= $SS[$#SS-1];$SS"
|
||||
"[$#SS-1]=$SS[$" "#SS]-$SS[$#SS-" "1]; $SS[$#SS]-"
|
||||
"=$SS[$#SS-1]} ",0),0 );</code></pre>
|
||||
<p>and in particular it appears that it is the perl itself. In other words if one
|
||||
changes it to be:</p>
|
||||
<div class="sourceCode" id="cb54"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb54-1"><a href="#cb54-1" aria-hidden="true" tabindex="-1"></a> perl_eval_sv<span class="op">(</span>newSVpv<span class="op">(</span><span class="st">""</span><span class="op">,</span><span class="dv">0</span><span class="op">),</span><span class="dv">0</span><span class="op">);</span></span></code></pre></div>
|
||||
<pre class="<!---c-->"><code> perl_eval_sv(newSVpv("",0),0);</code></pre>
|
||||
<p>it will not crash. But of course it won’t do anything either. So it’s more
|
||||
specifically that the call to <code>newSVpv()</code> crashes the code but <em>INSIDE</em>
|
||||
(key point!) the call to <code>perl_eval_sv()</code> that does it. Given what the author
|
||||
stated and that the version of perl is < than 5.6.0 which the author states can
|
||||
crash this makes sense.</p>
|
||||
<p>The example command above <em>should</em> print:</p>
|
||||
<div class="sourceCode" id="cb55"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb55-1"><a href="#cb55-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> echo <span class="st">"13 14 15 16 17 + - * / p"</span> <span class="kw">|</span> <span class="ex">./dlowe</span></span>
|
||||
<span id="cb55-2"><a href="#cb55-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">-0.0515873015873016</span></span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> $ echo "13 14 15 16 17 + - * / p" | ./dlowe
|
||||
-0.0515873015873016</code></pre>
|
||||
<p>and that’s what it shows in linux.</p>
|
||||
<p>Note that with different perl libraries in macOS (for instance from
|
||||
<a href="https://brew.sh">Homebrew</a> and <a href="https://www.macports.org">MacPorts</a>) it will
|
||||
@@ -1385,7 +1385,7 @@ of 92 warnings! Nonetheless neither works okay and both crash.</p>
|
||||
<h3 id="source-code-2000primenumprimenum.c">Source code: <a href="2000/primenum/primenum.c">2000/primenum/primenum.c</a></h3>
|
||||
<h3 id="information-2000primenumindex.html">Information: <a href="2000/primenum/index.html">2000/primenum/index.html</a></h3>
|
||||
<p>This program does not do what you might think it does! Running it like:</p>
|
||||
<div class="sourceCode" id="cb56"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb56-1"><a href="#cb56-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./primenum</span> 13</span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> ./primenum 13</code></pre>
|
||||
<p>will seemingly wait for input exactly because it is waiting for input. See the
|
||||
index.html file or look at the source.</p>
|
||||
<p>Although the name of the program suggests it prints prime numbers this is not
|
||||
@@ -1556,17 +1556,17 @@ identified by <code>R</code>.</p>
|
||||
<p>Since the game never ends properly the score is not printed either.</p>
|
||||
<p>It appears that the crash happens in more than one place. For instance it has
|
||||
happened at</p>
|
||||
<div class="sourceCode" id="cb57"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb57-1"><a href="#cb57-1" aria-hidden="true" tabindex="-1"></a> XCheckMaskEvent<span class="op">(</span>d<span class="op">,</span> <span class="dv">4</span><span class="op">,&</span>e<span class="op">)</span></span></code></pre></div>
|
||||
<pre class="<!---c-->"><code> XCheckMaskEvent(d, 4,&e)</code></pre>
|
||||
<p>but it’s also happened at</p>
|
||||
<div class="sourceCode" id="cb58"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb58-1"><a href="#cb58-1" aria-hidden="true" tabindex="-1"></a> <span class="cf">else</span> XDrawPoint<span class="op">(</span>d <span class="op">,</span>w<span class="op">,</span>g<span class="op">,(</span>l<span class="op">.</span>s<span class="op">+=</span>l<span class="op">.</span>a<span class="op">)>></span><span class="dv">9</span><span class="op">,</span> h<span class="op">=(</span>l<span class="op">.</span>c<span class="op">+=</span>l<span class="op">.</span>b<span class="op">)>></span><span class="dv">9</span><span class="op">)</span></span></code></pre></div>
|
||||
<pre class="<!---c-->"><code> else XDrawPoint(d ,w,g,(l.s+=l.a)>>9, h=(l.c+=l.b)>>9)</code></pre>
|
||||
<p>In both cases the pointer <code>d</code> was corrupted:</p>
|
||||
<pre><code> (lldb) p d
|
||||
(Display *) 0x0000000000000001</code></pre>
|
||||
<p>It is believed that it also happened at</p>
|
||||
<div class="sourceCode" id="cb60"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb60-1"><a href="#cb60-1" aria-hidden="true" tabindex="-1"></a> XDrawString<span class="op">(</span>d<span class="op">,</span>w<span class="op">,</span>g<span class="op">,</span>W<span class="op">/</span><span class="dv">3</span><span class="op">,</span>H<span class="op">/</span><span class="dv">2</span><span class="op">,</span>m<span class="op">,</span>B<span class="op">);</span></span></code></pre></div>
|
||||
<pre class="<!---c-->"><code> XDrawString(d,w,g,W/3,H/2,m,B);</code></pre>
|
||||
<p>in <code>J()</code> and for the same reason.</p>
|
||||
<p>The loop seems to be stuck in the call to <code>usleep(3)</code> like:</p>
|
||||
<div class="sourceCode" id="cb61"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb61-1"><a href="#cb61-1" aria-hidden="true" tabindex="-1"></a> usleep<span class="op">(</span>p<span class="op">*</span><span class="dv">200</span><span class="op">);</span></span></code></pre></div>
|
||||
<pre class="<!---c-->"><code> usleep(p*200);</code></pre>
|
||||
<p>which happens to be in a <code>while()</code> loop.</p>
|
||||
<p>There is a way to get the code to crash. If you don’t do anything until
|
||||
everything is destroyed (where you’d lose the game if it ended) and then you
|
||||
@@ -1587,7 +1587,7 @@ sleeping.</p>
|
||||
<h3 id="information-2004gavinindex.html">Information: <a href="2004/gavin//index.html">2004/gavin//index.html</a></h3>
|
||||
<p>Segmentation fault will occur in some systems. For instance on macOS with the
|
||||
arm64 chip:</p>
|
||||
<div class="sourceCode" id="cb62"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb62-1"><a href="#cb62-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./gavin</span> <span class="op">></span> kernel</span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> ./gavin > kernel</code></pre>
|
||||
<p>When trying to link <code>gavin.o</code> to produce <code>sh</code>, the linker generates:</p>
|
||||
<pre><code> Undefined symbols for architecture arm64:
|
||||
"start", referenced from:
|
||||
@@ -1599,32 +1599,32 @@ you have a fix? We welcome your help!</p>
|
||||
<h3 id="recent-2004gavin-mods">Recent 2004/gavin mods:</h3>
|
||||
<p>Although not related some recent changes were made to 2004/gavin to let it
|
||||
compile under clang. The following patch was applied:</p>
|
||||
<div class="sourceCode" id="cb64"><pre class="sourceCode patch"><code class="sourceCode diff"><span id="cb64-1"><a href="#cb64-1" aria-hidden="true" tabindex="-1"></a> diff --git a/2004/gavin/gavin.c b/2004/gavin/gavin.c</span>
|
||||
<span id="cb64-2"><a href="#cb64-2" aria-hidden="true" tabindex="-1"></a> index c967b7e..2082b49 100644</span>
|
||||
<span id="cb64-3"><a href="#cb64-3" aria-hidden="true" tabindex="-1"></a> --- a/2004/gavin/gavin.c</span>
|
||||
<span id="cb64-4"><a href="#cb64-4" aria-hidden="true" tabindex="-1"></a> +++ b/2004/gavin/gavin.c</span>
|
||||
<span id="cb64-5"><a href="#cb64-5" aria-hidden="true" tabindex="-1"></a> @@ -1,8 +1,9 @@</span>
|
||||
<span id="cb64-6"><a href="#cb64-6" aria-hidden="true" tabindex="-1"></a> +int main(int t, char **q, char **d) { return cain(t, (int)q, (int)d); }</span>
|
||||
<span id="cb64-7"><a href="#cb64-7" aria-hidden="true" tabindex="-1"></a> #define G(n) int n(int t, int q, int d)</span>
|
||||
<span id="cb64-8"><a href="#cb64-8" aria-hidden="true" tabindex="-1"></a> #define X(p,t,s) (p>=t&&p<(t+s)&&(p-(t)&1023)<(s&1023))</span>
|
||||
<span id="cb64-9"><a href="#cb64-9" aria-hidden="true" tabindex="-1"></a> #define U(m) *((signed char *)(m))</span>
|
||||
<span id="cb64-10"><a href="#cb64-10" aria-hidden="true" tabindex="-1"></a> #define F if(!--q){</span>
|
||||
<span id="cb64-11"><a href="#cb64-11" aria-hidden="true" tabindex="-1"></a> -#define I(s) (int)main-(int)s</span>
|
||||
<span id="cb64-12"><a href="#cb64-12" aria-hidden="true" tabindex="-1"></a> +#define I(s) (int)cain-(int)s</span>
|
||||
<span id="cb64-13"><a href="#cb64-13" aria-hidden="true" tabindex="-1"></a> #define P(s,c,k) for(h=0; h>>14==0; h+=129)Y(16*c+h/1024+Y(V+36))&128>>(h&7)?U(s+(h&15367))=k:k</span>
|
||||
<span id="cb64-14"><a href="#cb64-14" aria-hidden="true" tabindex="-1"></a></span>
|
||||
<span id="cb64-15"><a href="#cb64-15" aria-hidden="true" tabindex="-1"></a> G (B)</span>
|
||||
<span id="cb64-16"><a href="#cb64-16" aria-hidden="true" tabindex="-1"></a> @@ -52,7 +53,7 @@ else</span>
|
||||
<span id="cb64-17"><a href="#cb64-17" aria-hidden="true" tabindex="-1"></a></span>
|
||||
<span id="cb64-18"><a href="#cb64-18" aria-hidden="true" tabindex="-1"></a> G (_);</span>
|
||||
<span id="cb64-19"><a href="#cb64-19" aria-hidden="true" tabindex="-1"></a> G (o);</span>
|
||||
<span id="cb64-20"><a href="#cb64-20" aria-hidden="true" tabindex="-1"></a> -G (main)</span>
|
||||
<span id="cb64-21"><a href="#cb64-21" aria-hidden="true" tabindex="-1"></a> +G (cain)</span>
|
||||
<span id="cb64-22"><a href="#cb64-22" aria-hidden="true" tabindex="-1"></a> {</span>
|
||||
<span id="cb64-23"><a href="#cb64-23" aria-hidden="true" tabindex="-1"></a> Z, k = K;</span>
|
||||
<span id="cb64-24"><a href="#cb64-24" aria-hidden="true" tabindex="-1"></a> if (!t)</span></code></pre></div>
|
||||
<pre class="<!---patch-->"><code> diff --git a/2004/gavin/gavin.c b/2004/gavin/gavin.c
|
||||
index c967b7e..2082b49 100644
|
||||
--- a/2004/gavin/gavin.c
|
||||
+++ b/2004/gavin/gavin.c
|
||||
@@ -1,8 +1,9 @@
|
||||
+int main(int t, char **q, char **d) { return cain(t, (int)q, (int)d); }
|
||||
#define G(n) int n(int t, int q, int d)
|
||||
#define X(p,t,s) (p>=t&&p<(t+s)&&(p-(t)&1023)<(s&1023))
|
||||
#define U(m) *((signed char *)(m))
|
||||
#define F if(!--q){
|
||||
-#define I(s) (int)main-(int)s
|
||||
+#define I(s) (int)cain-(int)s
|
||||
#define P(s,c,k) for(h=0; h>>14==0; h+=129)Y(16*c+h/1024+Y(V+36))&128>>(h&7)?U(s+(h&15367))=k:k
|
||||
|
||||
G (B)
|
||||
@@ -52,7 +53,7 @@ else
|
||||
|
||||
G (_);
|
||||
G (o);
|
||||
-G (main)
|
||||
+G (cain)
|
||||
{
|
||||
Z, k = K;
|
||||
if (!t)</code></pre>
|
||||
<p>The original Makefile from 2004 had the following to say about this entry:</p>
|
||||
<pre class="make"><code> # Special flags for the gavin entry
|
||||
<pre class="<!---make-->"><code> # Special flags for the gavin entry
|
||||
#
|
||||
# FYI: Older versions of GCC have a bug in -O2 optimization, hence -O1
|
||||
#
|
||||
@@ -1791,8 +1791,8 @@ used decimal mode, or any of the “undocumented” instructions.</p>
|
||||
obnoxious in macOS as it shows it at runtime (redirecting <code>stderr</code> to
|
||||
<code>/dev/null</code> will silence it). The following diff will almost work but it crashes
|
||||
with at least <code>computer.tofu</code> input file:</p>
|
||||
<div class="sourceCode" id="cb67"><pre class="sourceCode diff"><code class="sourceCode diff"><span id="cb67-1"><a href="#cb67-1" aria-hidden="true" tabindex="-1"></a> 12a13</span>
|
||||
<span id="cb67-2"><a href="#cb67-2" aria-hidden="true" tabindex="-1"></a> #define gets(c) fgets((c),PI,stdin)&&(((c)[strlen((c))-1]='\0'),c!=NULL)</span></code></pre></div>
|
||||
<pre class="<!---diff-->"><code> 12a13
|
||||
#define gets(c) fgets((c),PI,stdin)&&(((c)[strlen((c))-1]='\0'),c!=NULL)</code></pre>
|
||||
<h2 id="borsanyi"><a name="2006_borsanyi"></a>2006/borsanyi</h2>
|
||||
<h3 id="status-inabiaf---please-do-not-fix-41">STATUS: INABIAF - please <strong>DO NOT</strong> fix</h3>
|
||||
<h3 id="source-code-2006borsanyiborsanyi.c">Source code: <a href="2006/borsanyi/borsanyi.c">2006/borsanyi/borsanyi.c</a></h3>
|
||||
@@ -1919,14 +1919,14 @@ macOS. A few things that were noticed depending on <code>asan</code> sanitisers
|
||||
With <code>address</code> in linux:</p>
|
||||
<pre><code> richards.c:101:9: runtime error: null pointer passed as argument 2, which is declared to never be null</code></pre>
|
||||
<p>but it actually works. This code is:</p>
|
||||
<div class="sourceCode" id="cb70"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb70-1"><a href="#cb70-1" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span> <span class="cf">else</span></span>
|
||||
<span id="cb70-2"><a href="#cb70-2" aria-hidden="true" tabindex="-1"></a> p<span class="op">++;</span></span>
|
||||
<span id="cb70-3"><a href="#cb70-3" aria-hidden="true" tabindex="-1"></a> W<span class="op">(</span>c<span class="op">)}</span> <span class="co">/* LINE 101 */</span></span>
|
||||
<span id="cb70-4"><a href="#cb70-4" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span></span></code></pre></div>
|
||||
<pre class="<!---c-->"><code> } else
|
||||
p++;
|
||||
W(c)} /* LINE 101 */
|
||||
}</code></pre>
|
||||
<p>Okay but what about argument 2? Well <code>W</code> is defined as:</p>
|
||||
<div class="sourceCode" id="cb71"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb71-1"><a href="#cb71-1" aria-hidden="true" tabindex="-1"></a> <span class="pp">#define W</span><span class="op">(</span><span class="pp">c</span><span class="op">)</span><span class="pp"> e</span><span class="op">=</span><span class="pp">memmove</span><span class="op">(</span><span class="pp">e</span><span class="op">,</span><span class="pp">x</span><span class="op">[(</span>u<span class="op">)</span><span class="pp">c</span><span class="op">],</span><span class="pp"> y</span><span class="op">[(</span>u<span class="op">)</span><span class="pp">c</span><span class="op">])+</span><span class="pp">y</span><span class="op">[(</span>u<span class="op">)</span><span class="pp">c</span><span class="op">];</span></span></code></pre></div>
|
||||
<pre class="<!---c-->"><code> #define W(c) e=memmove(e,x[(u)c], y[(u)c])+y[(u)c];</code></pre>
|
||||
<p>so it would appear that</p>
|
||||
<div class="sourceCode" id="cb72"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb72-1"><a href="#cb72-1" aria-hidden="true" tabindex="-1"></a> x<span class="op">[(</span>u<span class="op">)</span>c<span class="op">]</span></span></code></pre></div>
|
||||
<pre class="<!---c-->"><code> x[(u)c]</code></pre>
|
||||
<p>(at least in my tired head?) is NULL. But why does it work then?</p>
|
||||
<p>NOTE: <code>u</code> is <code>int</code>.</p>
|
||||
<p>Under macOS (with the arm64 chip) we get:</p>
|
||||
@@ -2006,11 +2006,11 @@ address allocated in macOS? Or is it?</p>
|
||||
==10983==ABORTING
|
||||
/bin/bash: line 1: 10983 Abort trap: 6 ./richards</code></pre>
|
||||
<p>which corresponds to the code:</p>
|
||||
<div class="sourceCode" id="cb75"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb75-1"><a href="#cb75-1" aria-hidden="true" tabindex="-1"></a> o rd<span class="op">(</span>u v<span class="op">)</span></span>
|
||||
<span id="cb75-2"><a href="#cb75-2" aria-hidden="true" tabindex="-1"></a> <span class="op">{</span></span>
|
||||
<span id="cb75-3"><a href="#cb75-3" aria-hidden="true" tabindex="-1"></a> o <span class="op">*</span>a <span class="op">=</span> <span class="dv">0</span><span class="op">,</span> <span class="op">**</span>b <span class="op">=</span> <span class="op">&</span>a<span class="op">,</span> <span class="op">**</span>c <span class="op">=</span> b <span class="op">+</span> <span class="dv">32</span><span class="op">;</span></span>
|
||||
<span id="cb75-4"><a href="#cb75-4" aria-hidden="true" tabindex="-1"></a> x<span class="op">[</span>v<span class="op">]</span> <span class="op">=</span> w<span class="op">;</span></span>
|
||||
<span id="cb75-5"><a href="#cb75-5" aria-hidden="true" tabindex="-1"></a> <span class="cf">for</span> <span class="op">(;</span> b <span class="op"><</span> c <span class="op">&&</span> <span class="op">(*</span>b <span class="op"><</span> <span class="op">(</span>o <span class="op">*)</span>w <span class="op">||</span> <span class="op">*</span>b <span class="op">></span> <span class="op">(</span>o <span class="op">*)</span> T <span class="op">||</span> <span class="op">*</span>b <span class="op">==</span> <span class="op">&</span>v<span class="op">);</span> b<span class="op">++);</span> <span class="co">/* LINE 132 */</span></span></code></pre></div>
|
||||
<pre class="<!---c-->"><code> o rd(u v)
|
||||
{
|
||||
o *a = 0, **b = &a, **c = b + 32;
|
||||
x[v] = w;
|
||||
for (; b < c && (*b < (o *)w || *b > (o *) T || *b == &v); b++); /* LINE 132 */</code></pre>
|
||||
<p>but this seems to not necessarily be relevant since without it it works in
|
||||
linux.</p>
|
||||
<p>A warning of interest when compiling is:</p>
|
||||
@@ -2265,9 +2265,9 @@ but this is not known.</p>
|
||||
machine to find problems as it will allow you to verify what is correct and what
|
||||
is not. Again see his index.html for details. However it is also possible to not
|
||||
rely on the entry as the below shows. One should be able to do:</p>
|
||||
<div class="sourceCode" id="cb80"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb80-1"><a href="#cb80-1" aria-hidden="true" tabindex="-1"></a> <span class="bu">echo</span> <span class="st">'No. I want chocolate!'</span> <span class="kw">|</span> <span class="ex">./prog</span> <span class="op">></span> chocolate.raw</span>
|
||||
<span id="cb80-2"><a href="#cb80-2" aria-hidden="true" tabindex="-1"></a></span>
|
||||
<span id="cb80-3"><a href="#cb80-3" aria-hidden="true" tabindex="-1"></a><span class="ex">./prog</span> e <span class="op"><</span> chocolate.raw</span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> echo 'No. I want chocolate!' | ./prog > chocolate.raw
|
||||
|
||||
./prog e < chocolate.raw</code></pre>
|
||||
<p>and get:</p>
|
||||
<pre><code> No. I want some chocolate!</code></pre>
|
||||
<p>but instead we get:</p>
|
||||
@@ -2350,9 +2350,9 @@ loop printing whitespace.</li>
|
||||
<h3 id="source-code-2018houprog.c">Source code: <a href="2018/hou/prog.c">2018/hou/prog.c</a></h3>
|
||||
<h3 id="information-2018houindex.html">Information: <a href="2018/hou/index.html">2018/hou/index.html</a></h3>
|
||||
<p>When you run it on a JSON file you will see something like:</p>
|
||||
<div class="sourceCode" id="cb85"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb85-1"><a href="#cb85-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> ./prog <span class="op"><</span> ioccc.json <span class="op">></span> ioccc.html</span>
|
||||
<span id="cb85-2"><a href="#cb85-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">Assertion</span> failed: <span class="er">(</span><span class="ex">rulez</span><span class="kw">)</span><span class="ex">,</span> function C, file prog.c, line 124.</span>
|
||||
<span id="cb85-3"><a href="#cb85-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">Abort</span> trap: 6</span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> $ ./prog < ioccc.json > ioccc.html
|
||||
Assertion failed: (rulez), function C, file prog.c, line 124.
|
||||
Abort trap: 6</code></pre>
|
||||
<p>(from say running <code>./try.sh) but this is expected and the file</code>ioccc.html` will
|
||||
be generated properly.</p>
|
||||
<p>Some JSON files might cause the program to continue to run and seemingly
|
||||
@@ -2445,7 +2445,7 @@ values but his implementation matches that of macOS and FreeBSD.</p>
|
||||
that they can work but it might end up that the scripts don’t show any output
|
||||
anyway as they use the full alphabet. To test that it works one can have a
|
||||
script like:</p>
|
||||
<div class="sourceCode" id="cb87"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb87-1"><a href="#cb87-1" aria-hidden="true" tabindex="-1"></a> <span class="va">LC_ALL</span><span class="op">=</span>C <span class="ex">aäbcdefghijklmnoöpqrsßtuüvwxyz</span> <span class="kw">|</span> <span class="va">LC_ALL</span><span class="op">=</span>C <span class="fu">grep</span> .. <span class="kw">|</span> <span class="va">LC_ALL</span><span class="op">=</span>de_DE.UTF-8 <span class="ex">./prog</span> aäbcdefghijklmnoöpqrsßtuüvwxyz</span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> LC_ALL=C aäbcdefghijklmnoöpqrsßtuüvwxyz | LC_ALL=C grep .. | LC_ALL=de_DE.UTF-8 ./prog aäbcdefghijklmnoöpqrsßtuüvwxyz</code></pre>
|
||||
<p>If you run this you should see:</p>
|
||||
<pre><code> aäbcdefghijklmnoöpqrsßtuüvwxyz</code></pre>
|
||||
<p>which shows it works. However as the de.sh script refers to all letters it can’t
|
||||
@@ -2477,20 +2477,20 @@ beginning.</p>
|
||||
<p>This program will also very likely leave sockets lying about in the current
|
||||
working directory. For instance <a href="authors.html#Cody_Boone_Ferguson">Cody Boone
|
||||
Ferguson</a> showed us this:</p>
|
||||
<div class="sourceCode" id="cb90"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb90-1"><a href="#cb90-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">$</span> ls <span class="at">-al</span> <span class="kw">|</span><span class="fu">grep</span> <span class="st">'^s'</span></span>
|
||||
<span id="cb90-2"><a href="#cb90-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">srwxr-xr-x</span> 1 cody staff 0 Apr 6 08:19 .BDHFHALG=</span>
|
||||
<span id="cb90-3"><a href="#cb90-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">srwxr-xr-x</span> 1 cody staff 0 Apr 6 08:15 .CGGHAMGC=</span>
|
||||
<span id="cb90-4"><a href="#cb90-4" aria-hidden="true" tabindex="-1"></a> <span class="ex">srwxr-xr-x</span> 1 cody staff 0 Apr 6 08:16 .CMDGAELH=</span>
|
||||
<span id="cb90-5"><a href="#cb90-5" aria-hidden="true" tabindex="-1"></a> <span class="ex">srwxr-xr-x</span> 1 cody staff 0 Apr 3 08:47 .CMLBCCDA=</span>
|
||||
<span id="cb90-6"><a href="#cb90-6" aria-hidden="true" tabindex="-1"></a> <span class="ex">[...]</span></span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> $ ls -al |grep '^s'
|
||||
srwxr-xr-x 1 cody staff 0 Apr 6 08:19 .BDHFHALG=
|
||||
srwxr-xr-x 1 cody staff 0 Apr 6 08:15 .CGGHAMGC=
|
||||
srwxr-xr-x 1 cody staff 0 Apr 6 08:16 .CMDGAELH=
|
||||
srwxr-xr-x 1 cody staff 0 Apr 3 08:47 .CMLBCCDA=
|
||||
[...]</code></pre>
|
||||
<p>This is NOT a bug and you’ll have to (at least at this time?) delete the files
|
||||
manually. You shouldn’t have to worry about these being added to git: it seems
|
||||
to ignore sockets (it did at least in macOS).</p>
|
||||
<p>He provides the following tips on this situation. A simpler way to find sockets
|
||||
in the directory:</p>
|
||||
<div class="sourceCode" id="cb91"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb91-1"><a href="#cb91-1" aria-hidden="true" tabindex="-1"></a> <span class="fu">file</span> .<span class="pp">*</span><span class="kw">|</span><span class="fu">grep</span> socket<span class="kw">|</span><span class="fu">cut</span> <span class="at">-f1</span> <span class="at">-d:</span></span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> file .*|grep socket|cut -f1 -d:</code></pre>
|
||||
<p>To delete them you can do:</p>
|
||||
<div class="sourceCode" id="cb92"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb92-1"><a href="#cb92-1" aria-hidden="true" tabindex="-1"></a> <span class="fu">find</span> . <span class="at">-exec</span> file <span class="st">'{}'</span> <span class="dt">\;</span><span class="kw">|</span><span class="fu">grep</span> socket<span class="kw">|</span><span class="fu">cut</span> <span class="at">-f</span> 1 <span class="at">-d:</span> <span class="kw">|</span> <span class="fu">xargs</span> rm <span class="at">-f</span></span></code></pre></div>
|
||||
<pre class="<!---sh-->"><code> find . -exec file '{}' \;|grep socket|cut -f 1 -d: | xargs rm -f</code></pre>
|
||||
<p>though one might want to check that the program is not currently running. :-)</p>
|
||||
<h2 id="endoh"><a name="2019_endoh"></a>2019/endoh</h2>
|
||||
<h3 id="status-inabiaf---please-do-not-fix-74">STATUS: INABIAF - please <strong>DO NOT</strong> fix</h3>
|
||||
|
||||
Reference in new issue
Block a user