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<a href='https://github.com/akkartik/mu/blob/main/linux/ex7.subx'>https://github.com/akkartik/mu/blob/main/linux/ex7.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Example showing file syscalls.</span>
<span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># Create a file, open it for writing, write a character to it, close it, open</span>
<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># it for reading, read a character from it, close it, delete it, and return</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># the character read.</span>
<span id="L6" class="LineNr"> 6 </span><span class="subxComment">#</span>
<span id="L7" class="LineNr"> 7 </span><span class="subxComment"># To run:</span>
<span id="L8" class="LineNr"> 8 </span><span class="subxComment">#   $ bootstrap/bootstrap translate ex7.subx -o ex7</span>
<span id="L9" class="LineNr"> 9 </span><span class="subxComment">#   $ bootstrap/bootstrap run ex7</span>
<span id="L10" class="LineNr">10 </span><span class="subxComment"># Expected result:</span>
<span id="L11" class="LineNr">11 </span><span class="subxComment">#   $ echo $?</span>
<span id="L12" class="LineNr">12 </span><span class="subxComment">#   97</span>
<span id="L13" class="LineNr">13 </span>
<span id="L14" class="LineNr">14 </span>== code
<span id="L15" class="LineNr">15 </span><span class="subxComment">#   instruction                     effective address                                                   register    displacement    immediate</span>
<span id="L16" class="LineNr">16 </span><span class="subxS1Comment"># . op          subop               mod             rm32          base        index         scale       r32</span>
<span id="L17" class="LineNr">17 </span><span class="subxS1Comment"># . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes</span>
<span id="L18" class="LineNr">18 </span>
<span id="L19" class="LineNr">19 </span><span class="SpecialChar">Entry</span>:
<span id="L20" class="LineNr">20 </span>    <span class="subxComment"># creat(Filename)</span>
<span id="L21" class="LineNr">21 </span>    bb/copy-to-ebx  <span class="SpecialChar"><a href='ex7.subx.html#L94'>Filename</a></span>/imm32
<span id="L22" class="LineNr">22 </span>    b9/copy-to-ecx  0x180/imm32/fixed-perms
<span id="L23" class="LineNr">23 </span>    e8/call  <a href='000init.subx.html#L53'>syscall_creat</a>/disp32
<span id="L24" class="LineNr">24 </span>
<span id="L25" class="LineNr">25 </span>    <span class="subxComment"># stream = open(Filename, O_WRONLY, 0)  # we can't use 'fd' because it looks like a hex byte</span>
<span id="L26" class="LineNr">26 </span>    bb/copy-to-ebx  <span class="SpecialChar"><a href='ex7.subx.html#L94'>Filename</a></span>/imm32
<span id="L27" class="LineNr">27 </span>    b9/copy-to-ecx  1/imm32/wronly
<span id="L28" class="LineNr">28 </span>    ba/copy-to-edx  0x180/imm32/fixed-perms
<span id="L29" class="LineNr">29 </span>    e8/call  <a href='000init.subx.html#L35'>syscall_open</a>/disp32
<span id="L30" class="LineNr">30 </span>    <span class="subxComment"># save stream</span>
<span id="L31" class="LineNr">31 </span>    bb/copy-to-ebx  <span class="SpecialChar"><a href='ex7.subx.html#L88'>Stream</a></span>/imm32
<span id="L32" class="LineNr">32 </span>    89/copy                         0/mod/indirect  3/rm32/ebx   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          0/r32/eax  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy eax to *ebx</span>
<span id="L33" class="LineNr">33 </span>
<span id="L34" class="LineNr">34 </span>    <span class="subxComment"># write(Stream, &quot;a&quot;, 1)</span>
<span id="L35" class="LineNr">35 </span>    <span class="subxS1Comment"># . load<style>pre { line-height: 125%; }
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.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */</style><div class="highlight"><pre><span></span><span class="c1"># Copyright (C) 2009, 2010  Roman Zimbelmann &lt;romanz@lavabit.com&gt;</span>
<span class="c1">#</span>
<span class="c1"># This program is free software: you can redistribute it and/or modify</span>
<span class="c1"># it under the terms of the GNU General Public License as published by</span>
<span class="c1"># the Free Software Foundation, either version 3 of the License, or</span>
<span class="c1"># (at your option) any later version.</span>
<span class="c1">#</span>
<span class="c1"># This program is distributed in the hope that it will be useful,</span>
<span class="c1"># but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span class="c1"># MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<span class="c1"># GNU General Public License for more details.</span>
<span class="c1">#</span>
<span class="c1"># You should have received a copy of the GNU General Public License</span>
<span class="c1"># along with this program.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>

<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s1">&#39;__main__&#39;</span><span class="p">:</span> <span class="kn">from</span> <span class="nn">__init__</span> <span class="kn">import</span> <span class="n">init</span><span class="p">;</span> <span class="n">init</span><span class="p">()</span>

<span class="kn">import</span> <span class="nn">unittest</span>
<span class="kn">from</span> <span class="nn">ranger.ext.direction</span> <span class="kn">import</span> <span class="n">Direction</span>
<span class="kn">from</span> <span class="nn">ranger.ext.openstruct</span> <span class="kn">import</span> <span class="n">OpenStruct</span>

<span class="k">class</span> <span class="nc">TestDirections</span><span class="p">(</span><span class="n">unittest</span><span class="o">.</span><span class="n">TestCase</span><span class="p">):</span>
	<span class="k">def</span> <span class="nf">test_symmetry</span><span class="p">(</span><span class="bp">self</span><span