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| @@ -0,0 +1,126 @@ | ||
| <!DOCTYPE html> | ||
| <html xmlns="http://www.w3.org/1999/xhtml" lang="" xml:lang=""> | ||
| <head> | ||
| <meta charset="utf-8" /> | ||
| <meta name="generator" content="pandoc" /> | ||
| <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes" /> | ||
| <title>Cursed Code Collection</title> | ||
| </head> | ||
| <body> | ||
| <h1 id="cursed-code-collection">Cursed Code Collection</h1> | ||
| <hr> | ||
| <p>The shebang for C is just a little bit longer than one line.</p> | ||
| <div class="sourceCode" id="cb1"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="pp">#if 0</span></span> | ||
| <span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a><span class="co">TMP=</span><span class="st">"$(mktemp -d)"</span></span> | ||
| <span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabindex="-1"></a><span class="co">cc -o </span><span class="st">"$TMP/a.out"</span><span class="co"> -x c </span><span class="st">"$0"</span><span class="co"> && </span><span class="st">"$TMP/a.out"</span><span class="co"> $@</span></span> | ||
| <span id="cb1-4"><a href="#cb1-4" aria-hidden="true" tabindex="-1"></a><span class="co">RVAL=$?</span></span> | ||
| <span id="cb1-5"><a href="#cb1-5" aria-hidden="true" tabindex="-1"></a><span class="co">rm -rf </span><span class="st">"$TMP"</span></span> | ||
| <span id="cb1-6"><a href="#cb1-6" aria-hidden="true" tabindex="-1"></a><span class="co">exit $RVAL</span></span> | ||
| <span id="cb1-7"><a href="#cb1-7" aria-hidden="true" tabindex="-1"></a><span class="pp">#endif</span></span> | ||
| <span id="cb1-8"><a href="#cb1-8" aria-hidden="true" tabindex="-1"></a></span> | ||
| <span id="cb1-9"><a href="#cb1-9" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im"><stdio.h></span></span> | ||
| <span id="cb1-10"><a href="#cb1-10" aria-hidden="true" tabindex="-1"></a><span class="dt">int</span> main<span class="op">()</span> <span class="op">{</span></span> | ||
| <span id="cb1-11"><a href="#cb1-11" aria-hidden="true" tabindex="-1"></a> puts<span class="op">(</span><span class="st">"This is such a cool bash script!"</span><span class="op">);</span></span> | ||
| <span id="cb1-12"><a href="#cb1-12" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div> | ||
| <hr> | ||
| <p>Open a file, swap the nibbles of every byte, and write it back. I'm | ||
| not sure if this error handling macro is big brain or small brain. For | ||
| sure it wouldn't pass code review.</p> | ||
| <div class="sourceCode" id="cb2"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im"><stdlib.h></span></span> | ||
| <span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im"><unistd.h></span></span> | ||
| <span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im"><fcntl.h></span></span> | ||
| <span id="cb2-4"><a href="#cb2-4" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im"><sys/stat.h></span></span> | ||
| <span id="cb2-5"><a href="#cb2-5" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im"><stdio.h></span></span> | ||
| <span id="cb2-6"><a href="#cb2-6" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im"><errno.h></span></span> | ||
| <span id="cb2-7"><a href="#cb2-7" aria-hidden="true" tabindex="-1"></a></span> | ||
| <span id="cb2-8"><a href="#cb2-8" aria-hidden="true" tabindex="-1"></a><span class="dt">char</span><span class="op">*</span> b<span class="op">;</span></span> | ||
| <span id="cb2-9"><a href="#cb2-9" aria-hidden="true" tabindex="-1"></a><span class="dt">size_t</span> i<span class="op">;</span></span> | ||
| <span id="cb2-10"><a href="#cb2-10" aria-hidden="true" tabindex="-1"></a><span class="dt">int</span> fd<span class="op">;</span></span> | ||
| <span id="cb2-11"><a href="#cb2-11" aria-hidden="true" tabindex="-1"></a><span class="kw">struct</span> stat st<span class="op">;</span></span> | ||
| <span id="cb2-12"><a href="#cb2-12" aria-hidden="true" tabindex="-1"></a></span> | ||
| <span id="cb2-13"><a href="#cb2-13" aria-hidden="true" tabindex="-1"></a><span class="pp">#define EH(fn,...) fn(__VA_ARGS__); if (errno) return perror(#fn), 1;</span></span> | ||
| <span id="cb2-14"><a href="#cb2-14" aria-hidden="true" tabindex="-1"></a><span class="pp">#define sz st.st_size</span></span> | ||
| <span id="cb2-15"><a href="#cb2-15" aria-hidden="true" tabindex="-1"></a></span> | ||
| <span id="cb2-16"><a href="#cb2-16" aria-hidden="true" tabindex="-1"></a><span class="dt">int</span> main<span class="op">(</span><span class="dt">int</span> argc<span class="op">,</span> <span class="dt">char</span><span class="op">**</span> argv<span class="op">)</span> <span class="op">{</span></span> | ||
| <span id="cb2-17"><a href="#cb2-17" aria-hidden="true" tabindex="-1"></a> <span class="cf">if</span> <span class="op">(</span>argc <span class="op">!=</span> <span class="dv">3</span><span class="op">)</span> <span class="cf">return</span> <span class="dv">1</span><span class="op">;</span></span> | ||
| <span id="cb2-18"><a href="#cb2-18" aria-hidden="true" tabindex="-1"></a> EH<span class="op">(</span>stat<span class="op">,</span> argv<span class="op">[</span><span class="dv">1</span><span class="op">],</span> <span class="op">&</span>st<span class="op">);</span></span> | ||
| <span id="cb2-19"><a href="#cb2-19" aria-hidden="true" tabindex="-1"></a> b <span class="op">=</span> EH<span class="op">(</span>malloc<span class="op">,</span> sz<span class="op">);</span></span> | ||
| <span id="cb2-20"><a href="#cb2-20" aria-hidden="true" tabindex="-1"></a> fd <span class="op">=</span> EH<span class="op">(</span>open<span class="op">,</span> argv<span class="op">[</span><span class="dv">1</span><span class="op">],</span> O_RDONLY<span class="op">);</span></span> | ||
| <span id="cb2-21"><a href="#cb2-21" aria-hidden="true" tabindex="-1"></a> EH<span class="op">(</span>read<span class="op">,</span> fd<span class="op">,</span> b<span class="op">,</span> sz<span class="op">);</span></span> | ||
| <span id="cb2-22"><a href="#cb2-22" aria-hidden="true" tabindex="-1"></a> <span class="cf">for</span> <span class="op">(</span>i <span class="op">=</span> <span class="dv">0</span><span class="op">;</span> i <span class="op"><</span> sz<span class="op">;</span> <span class="op">++</span>i<span class="op">)</span></span> | ||
| <span id="cb2-23"><a href="#cb2-23" aria-hidden="true" tabindex="-1"></a> b<span class="op">[</span>i<span class="op">]</span> <span class="op">=</span> <span class="op">((</span>b<span class="op">[</span>i<span class="op">]</span> <span class="op">&</span> <span class="bn">0x0F</span><span class="op">)</span> <span class="op"><<</span> <span class="dv">4</span><span class="op">)</span> <span class="op">|</span> <span class="op">((</span>b<span class="op">[</span>i<span class="op">]</span> <span class="op">&</span> <span class="bn">0xF0</span><span class="op">)</span> <span class="op">>></span> <span class="dv">4</span><span class="op">);</span></span> | ||
| <span id="cb2-24"><a href="#cb2-24" aria-hidden="true" tabindex="-1"></a> fd <span class="op">=</span> EH<span class="op">(</span>creat<span class="op">,</span> argv<span class="op">[</span><span class="dv">2</span><span class="op">],</span> S_IRWXU<span class="op">);</span></span> | ||
| <span id="cb2-25"><a href="#cb2-25" aria-hidden="true" tabindex="-1"></a> EH<span class="op">(</span>write<span class="op">,</span> fd<span class="op">,</span> b<span class="op">,</span> sz<span class="op">);</span></span> | ||
| <span id="cb2-26"><a href="#cb2-26" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div> | ||
| <hr> | ||
| <p>Annihilate your python runtime.</p> | ||
| <div class="sourceCode" id="cb3"><pre class="sourceCode py"><code class="sourceCode python"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a>da, di <span class="op">=</span> <span class="bu">delattr</span>, <span class="bu">dir</span></span> | ||
| <span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a>shred_runtime <span class="op">=</span> <span class="kw">lambda</span>: [da(__builtins__, a) <span class="cf">for</span> a <span class="kw">in</span> di(__builtins__)]</span> | ||
| <span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a>shred_runtime()</span> | ||
| <span id="cb3-4"><a href="#cb3-4" aria-hidden="true" tabindex="-1"></a></span> | ||
| <span id="cb3-5"><a href="#cb3-5" aria-hidden="true" tabindex="-1"></a><span class="co"># print() is no longer defined</span></span> | ||
| <span id="cb3-6"><a href="#cb3-6" aria-hidden="true" tabindex="-1"></a><span class="bu">print</span>(<span class="st">"Hello World!"</span>)</span></code></pre></div> | ||
| <hr> | ||
| <p>Use generics to figure out what version of <code>strerror_r</code> | ||
| you have. This is less cursed code, and more just the most sane way of | ||
| doing things. But the fact that <code>_Generic</code> is actually the | ||
| best solution to any problem is baffling, and cursed in its own | ||
| right.</p> | ||
| <div class="sourceCode" id="cb4"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im"><string.h></span></span> | ||
| <span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im"><stdio.h></span></span> | ||
| <span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a></span> | ||
| <span id="cb4-4"><a href="#cb4-4" aria-hidden="true" tabindex="-1"></a><span class="pp">#define STRERR_R _Generic(strerror_r, \</span></span> | ||
| <span id="cb4-5"><a href="#cb4-5" aria-hidden="true" tabindex="-1"></a><span class="pp"> int(*)(int, char*, size_t): "XSI", \</span></span> | ||
| <span id="cb4-6"><a href="#cb4-6" aria-hidden="true" tabindex="-1"></a><span class="pp"> char*(*)(int, char*, size_t): "GNU", \</span></span> | ||
| <span id="cb4-7"><a href="#cb4-7" aria-hidden="true" tabindex="-1"></a><span class="pp"> default: "UNK")</span></span> | ||
| <span id="cb4-8"><a href="#cb4-8" 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 class="op">{</span></span> | ||
| <span id="cb4-9"><a href="#cb4-9" aria-hidden="true" tabindex="-1"></a> puts<span class="op">(</span>STRERR_R<span class="op">);</span></span> | ||
| <span id="cb4-10"><a href="#cb4-10" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div> | ||
| <hr> | ||
| <p><code>eval()</code> exists in javascript and python. It takes code as | ||
| a string and runs it. What if I told you it existed in C as well?</p> | ||
| <div class="sourceCode" id="cb5"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im"><stdio.h></span></span> | ||
| <span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im"><stdlib.h></span></span> | ||
| <span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im"><dlfcn.h></span></span> | ||
| <span id="cb5-4"><a href="#cb5-4" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im"><unistd.h></span></span> | ||
| <span id="cb5-5"><a href="#cb5-5" aria-hidden="true" tabindex="-1"></a></span> | ||
| <span id="cb5-6"><a href="#cb5-6" aria-hidden="true" tabindex="-1"></a><span class="dt">void</span> eval<span class="op">(</span><span class="dt">char</span><span class="op">*</span> program<span class="op">,</span> <span class="dt">char</span><span class="op">*</span> symbol<span class="op">)</span> <span class="op">{</span></span> | ||
| <span id="cb5-7"><a href="#cb5-7" aria-hidden="true" tabindex="-1"></a> <span class="dt">FILE</span><span class="op">*</span> tmpf <span class="op">=</span> fopen<span class="op">(</span><span class="st">"/tmp/libtmp.c"</span><span class="op">,</span> <span class="st">"w"</span><span class="op">);</span></span> | ||
| <span id="cb5-8"><a href="#cb5-8" aria-hidden="true" tabindex="-1"></a> fprintf<span class="op">(</span>tmpf<span class="op">,</span> program<span class="op">);</span></span> | ||
| <span id="cb5-9"><a href="#cb5-9" aria-hidden="true" tabindex="-1"></a> fclose<span class="op">(</span>tmpf<span class="op">);</span></span> | ||
| <span id="cb5-10"><a href="#cb5-10" aria-hidden="true" tabindex="-1"></a> system<span class="op">(</span><span class="st">"cc /tmp/libtmp.c -shared -o /tmp/libtmp.so"</span><span class="op">);</span></span> | ||
| <span id="cb5-11"><a href="#cb5-11" aria-hidden="true" tabindex="-1"></a> <span class="op">((</span><span class="dt">void</span><span class="op">(*)(</span><span class="dt">void</span><span class="op">))</span>dlsym<span class="op">(</span>dlopen<span class="op">(</span><span class="st">"/tmp/libtmp.so"</span><span class="op">,</span> RTLD_LAZY<span class="op">),</span> symbol<span class="op">))();</span></span> | ||
| <span id="cb5-12"><a href="#cb5-12" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span> | ||
| <span id="cb5-13"><a href="#cb5-13" aria-hidden="true" tabindex="-1"></a></span> | ||
| <span id="cb5-14"><a href="#cb5-14" aria-hidden="true" tabindex="-1"></a><span class="dt">int</span> main<span class="op">()</span> <span class="op">{</span></span> | ||
| <span id="cb5-15"><a href="#cb5-15" aria-hidden="true" tabindex="-1"></a> <span class="dt">char</span><span class="op">*</span> hello_world <span class="op">=</span> <span class="op">(</span><span class="dt">char</span><span class="op">*)</span><span class="st">"#include <stdio.h></span><span class="sc">\n</span><span class="st">"</span></span> | ||
| <span id="cb5-16"><a href="#cb5-16" aria-hidden="true" tabindex="-1"></a> <span class="st">"void hello(void) {</span><span class="sc">\n</span><span class="st">"</span></span> | ||
| <span id="cb5-17"><a href="#cb5-17" aria-hidden="true" tabindex="-1"></a> <span class="st">" puts(</span><span class="sc">\"</span><span class="st">Hello World!</span><span class="sc">\"</span><span class="st">);</span><span class="sc">\n</span><span class="st">"</span></span> | ||
| <span id="cb5-18"><a href="#cb5-18" aria-hidden="true" tabindex="-1"></a> <span class="st">"}"</span><span class="op">;</span></span> | ||
| <span id="cb5-19"><a href="#cb5-19" aria-hidden="true" tabindex="-1"></a> eval<span class="op">(</span>hello_world<span class="op">,</span> <span class="st">"hello"</span><span class="op">);</span></span> | ||
| <span id="cb5-20"><a href="#cb5-20" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div> | ||
| <hr> | ||
| <p>My favorite hello world program. The compiler replaces the while loop | ||
| with a call to memset, and it calls our memset rather than the one from | ||
| the stdlib, because that one hasn't been included.</p> | ||
| <div class="sourceCode" id="cb6"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im"><stdio.h></span></span> | ||
| <span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a></span> | ||
| <span id="cb6-3"><a href="#cb6-3" aria-hidden="true" tabindex="-1"></a><span class="dt">void</span><span class="op">*</span> memset<span class="op">(</span><span class="dt">void</span><span class="op">*</span> s<span class="op">,</span> <span class="dt">int</span> c<span class="op">,</span> <span class="dt">size_t</span> n<span class="op">)</span> <span class="op">{</span></span> | ||
| <span id="cb6-4"><a href="#cb6-4" aria-hidden="true" tabindex="-1"></a> puts<span class="op">(</span><span class="st">"Hello world"</span><span class="op">);</span></span> | ||
| <span id="cb6-5"><a href="#cb6-5" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span> | ||
| <span id="cb6-6"><a href="#cb6-6" aria-hidden="true" tabindex="-1"></a></span> | ||
| <span id="cb6-7"><a href="#cb6-7" aria-hidden="true" tabindex="-1"></a><span class="dt">int</span> main<span class="op">(</span><span class="dt">int</span> argc<span class="op">,</span> <span class="dt">char</span><span class="op">**</span> argv<span class="op">)</span> <span class="op">{</span></span> | ||
| <span id="cb6-8"><a href="#cb6-8" aria-hidden="true" tabindex="-1"></a> <span class="cf">while</span> <span class="op">(</span>argc<span class="op">--)</span> argv<span class="op">[</span>argc<span class="op">]</span> <span class="op">=</span> <span class="dv">0</span><span class="op">;</span></span> | ||
| <span id="cb6-9"><a href="#cb6-9" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div> | ||
| <hr> | ||
| <p>Melt your compiler. GCC does the right thing and tries to read | ||
| /dev/urandom forever. For some reason, clang does not, doesn't even | ||
| error, and compiles a functional hello world program.</p> | ||
| <div class="sourceCode" id="cb7"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im"></dev/urandom></span></span> | ||
| <span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a><span class="pp">#include </span><span class="im"><stdio.h></span></span> | ||
| <span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a></span> | ||
| <span id="cb7-4"><a href="#cb7-4" aria-hidden="true" tabindex="-1"></a><span class="dt">int</span> main<span class="op">()</span> <span class="op">{</span></span> | ||
| <span id="cb7-5"><a href="#cb7-5" aria-hidden="true" tabindex="-1"></a> puts<span class="op">(</span><span class="st">"Hello world!"</span><span class="op">);</span></span> | ||
| <span id="cb7-6"><a href="#cb7-6" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div> | ||
| </body> | ||
| </html> |
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