152 lines
25 KiB
HTML
152 lines
25 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<title>Directories</title>
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<link href="../docs-assets/Breadcrumbs.css" rel="stylesheet" rev="stylesheet" type="text/css">
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<meta name="viewport" content="width=device-width initial-scale=1">
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<nav role="navigation">
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<h1><a href="../index.html">
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<img src="../docs-assets/Octagram.png" width=72 height=72">
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</a></h1>
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<ul><li><a href="../inweb/index.html">inweb</a></li>
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</ul><h2>Foundation Module</h2><ul>
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<li><a href="index.html"><span class="selectedlink">foundation</span></a></li>
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<li><a href="../foundation-test/index.html">foundation-test</a></li>
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</ul><h2>Example Webs</h2><ul>
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<li><a href="../goldbach/index.html">goldbach</a></li>
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<li><a href="../twinprimes/twinprimes.html">twinprimes</a></li>
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</ul><h2>Repository</h2><ul>
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<li><a href="https://github.com/ganelson/inweb"><img src="../docs-assets/github.png" height=18> github</a></li>
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</ul><h2>Related Projects</h2><ul>
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<li><a href="../../../inform/docs/overview.html">inform</a></li>
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<li><a href="../../../intest/docs/index.html">intest</a></li>
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<main role="main">
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<!--Weave of 'Directories' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="index.html">foundation</a></li><li><a href="index.html#3">Chapter 3: The Operating System</a></li><li><b>Directories</b></li></ul></div>
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<p class="purpose">Scanning directories on the host filing system.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>All of this abstracts the code already found in the platform definitions.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">scan_directory</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">directory_handle</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax"> </span><span class="identifier-syntax">directory_name_written_out</span><span class="plain-syntax">[4*</span><span class="constant-syntax">MAX_FILENAME_LENGTH</span><span class="plain-syntax">];</span>
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<span class="plain-syntax"> </span><span class="constant-syntax">CLASS_DEFINITION</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">scan_directory</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure scan_directory is private to this section.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>The directory name going out has to be transcoded from flat Unicode to
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whatever the locale encoding is; the filenames coming back have to be
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transcoded the other way.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">scan_directory</span><span class="plain-syntax"> *</span><span class="function-syntax">Directories::open</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">Directories::open</span></span>:<br/><a href="3-drc.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">scan_directory</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">scan_directory</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">, </span><span class="string-syntax">"%p"</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="4-sm.html#SP6" class="function-link"><span class="function-syntax">Str::copy_to_locale_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">-></span><span class="element-syntax">directory_name_written_out</span><span class="plain-syntax">, </span><span class="identifier-syntax">pn</span><span class="plain-syntax">, </span><span class="constant-syntax">4</span><span class="plain-syntax">*</span><span class="constant-syntax">MAX_FILENAME_LENGTH</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">D</span><span class="plain-syntax">-></span><span class="element-syntax">directory_handle</span><span class="plain-syntax"> = </span><a href="1-wp.html#SP9" class="function-link"><span class="function-syntax">Platform::opendir</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">-></span><span class="element-syntax">directory_name_written_out</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">D</span><span class="plain-syntax">-></span><span class="identifier-syntax">directory_handle</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">D</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Directories::next</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">Directories::next</span></span>:<br/><a href="3-drc.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">scan_directory</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">leafname</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax"> </span><span class="identifier-syntax">leafname_Cs</span><span class="plain-syntax">[</span><span class="constant-syntax">MAX_FILENAME_LENGTH</span><span class="plain-syntax">];</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">rv</span><span class="plain-syntax"> = </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><span class="identifier-syntax">rv</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">rv</span><span class="plain-syntax"> = </span><a href="1-wp.html#SP9" class="function-link"><span class="function-syntax">Platform::readdir</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">-></span><span class="element-syntax">directory_handle</span><span class="plain-syntax">, </span><span class="identifier-syntax">D</span><span class="plain-syntax">-></span><span class="element-syntax">directory_name_written_out</span><span class="plain-syntax">, </span><span class="identifier-syntax">leafname_Cs</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">leafname_Cs</span><span class="plain-syntax">[0] != </span><span class="character-syntax">'.'</span><span class="plain-syntax">) </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::clear</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">leafname</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">rv</span><span class="plain-syntax">) </span><a href="2-str.html#SP32" class="function-link"><span class="function-syntax">Streams::write_locale_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">leafname</span><span class="plain-syntax">, </span><span class="identifier-syntax">leafname_Cs</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">rv</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Directories::close</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">Directories::close</span></span>:<br/><a href="3-drc.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">scan_directory</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="1-wp.html#SP9" class="function-link"><span class="function-syntax">Platform::closedir</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">-></span><span class="element-syntax">directory_handle</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>It turns out to be useful to scan the contents of a directory in an order
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which is predictable regardless of platform — <span class="extract"><span class="extract-syntax">Platform::readdir</span></span> works in a
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different order on MacOS, Windows and Linux, even given the same directory
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of files to work on. So the following returns a linked list of the contents,
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sorted into alphabetical order, but case-insensitively. For the Inform project,
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at least, we don't anticipate ever dealing with files whose names disagree only
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in casing, so this ordering is effectively deterministic.
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</p>
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<p class="commentary">There's some time and memory overhead here, but unless we're dealing with
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directories holding upwards of 10,000 files or so, it'll be trivial.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="function-syntax">Directories::listing</span><span class="plain-syntax">(</span><span class="reserved-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">capacity</span><span class="plain-syntax"> = </span><span class="constant-syntax">4</span><span class="plain-syntax">, </span><span class="identifier-syntax">used</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> **</span><span class="identifier-syntax">listing_array</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> **)</span>
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<span class="plain-syntax"> (</span><a href="2-mmr.html#SP24" class="function-link"><span class="function-syntax">Memory::calloc</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">capacity</span><span class="plain-syntax">, </span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *), </span><span class="constant-syntax">ARRAY_SORTING_MREASON</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">scan_directory</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax"> = </span><a href="3-drc.html#SP2" class="function-link"><span class="function-syntax">Directories::open</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">D</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">entry</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP2" class="function-link"><span class="function-syntax">Str::new</span></a><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><a href="3-drc.html#SP2" class="function-link"><span class="function-syntax">Directories::next</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">, </span><span class="identifier-syntax">entry</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">used</span><span class="plain-syntax"> == </span><span class="identifier-syntax">capacity</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">new_capacity</span><span class="plain-syntax"> = </span><span class="constant-syntax">4</span><span class="plain-syntax">*</span><span class="identifier-syntax">capacity</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> **</span><span class="identifier-syntax">new_listing_array</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> **)</span>
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<span class="plain-syntax"> (</span><a href="2-mmr.html#SP24" class="function-link"><span class="function-syntax">Memory::calloc</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">new_capacity</span><span class="plain-syntax">, </span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *), </span><span class="constant-syntax">ARRAY_SORTING_MREASON</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><</span><span class="identifier-syntax">used</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) </span><span class="identifier-syntax">new_listing_array</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] = </span><span class="identifier-syntax">listing_array</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">];</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">listing_array</span><span class="plain-syntax"> = </span><span class="identifier-syntax">new_listing_array</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">capacity</span><span class="plain-syntax"> = </span><span class="identifier-syntax">new_capacity</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">listing_array</span><span class="plain-syntax">[</span><span class="identifier-syntax">used</span><span class="plain-syntax">++] = </span><span class="identifier-syntax">entry</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">entry</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP2" class="function-link"><span class="function-syntax">Str::new</span></a><span class="plain-syntax">();</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><a href="3-drc.html#SP2" class="function-link"><span class="function-syntax">Directories::close</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">qsort</span><span class="plain-syntax">(</span><span class="identifier-syntax">listing_array</span><span class="plain-syntax">, (</span><span class="identifier-syntax">size_t</span><span class="plain-syntax">) </span><span class="identifier-syntax">used</span><span class="plain-syntax">, </span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *), </span><a href="3-drc.html#SP3" class="function-link"><span class="function-syntax">Directories::compare_names</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">L</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><</span><span class="identifier-syntax">used</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">listing_array</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">], </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-mmr.html#SP26" class="function-link"><span class="function-syntax">Memory::I7_free</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">listing_array</span><span class="plain-syntax">, </span><span class="constant-syntax">ARRAY_SORTING_MREASON</span><span class="plain-syntax">, </span><span class="identifier-syntax">capacity</span><span class="plain-syntax">*((</span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *)));</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">L</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Directories::compare_names</span><span class="plain-syntax">(</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ent1</span><span class="plain-syntax">, </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ent2</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tx1</span><span class="plain-syntax"> = *((</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> **) </span><span class="identifier-syntax">ent1</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tx2</span><span class="plain-syntax"> = *((</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> **) </span><span class="identifier-syntax">ent2</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="4-sm.html#SP20" class="function-link"><span class="function-syntax">Str::cmp_insensitive</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">tx1</span><span class="plain-syntax">, </span><span class="identifier-syntax">tx2</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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