92 lines
8.2 KiB
HTML
92 lines
8.2 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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</head>
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<body>
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<nav role="navigation">
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<h1><a href="../webs.html">Sources</a></h1>
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<ul>
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<li><a href="../inweb/index.html">inweb</a></li>
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</ul>
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<h2>Foundation</h2>
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<ul>
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<li><a href="../foundation-module/index.html">foundation-module</a></li>
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<li><a href="../foundation-test/index.html">foundation-test</a></li>
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</ul>
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<main role="main">
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<!--Weave of 'Directories' generated by 7-->
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<ul class="crumbs"><li><a href="../webs.html">Source</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><p class="purpose">Scanning directories on the host filing system.</p>
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<p class="inwebparagraph"><a id="SP1"></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="display">
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<span class="reserved">typedef</span><span class="plain"> </span><span class="reserved">struct</span><span class="plain"> </span><span class="reserved">scan_directory</span><span class="plain"> {</span>
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<span class="reserved">void</span><span class="plain"> *</span><span class="identifier">directory_handle</span><span class="plain">;</span>
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<span class="reserved">char</span><span class="plain"> </span><span class="identifier">directory_name_written_out</span><span class="plain">[4*</span><span class="constant">MAX_FILENAME_LENGTH</span><span class="plain">];</span>
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<span class="constant">MEMORY_MANAGEMENT</span>
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<span class="plain">} </span><span class="reserved">scan_directory</span><span class="plain">;</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The structure scan_directory is private to this section.</p>
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<p class="inwebparagraph"><a id="SP2"></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="display">
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<span class="reserved">scan_directory</span><span class="plain"> *</span><span class="functiontext">Directories::open</span><span class="plain">(</span><span class="reserved">pathname</span><span class="plain"> *</span><span class="identifier">P</span><span class="plain">) {</span>
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<span class="reserved">scan_directory</span><span class="plain"> *</span><span class="identifier">D</span><span class="plain"> = </span><span class="identifier">CREATE</span><span class="plain">(</span><span class="reserved">scan_directory</span><span class="plain">);</span>
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<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">pn</span><span class="plain">);</span>
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<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">pn</span><span class="plain">, </span><span class="string">"%p"</span><span class="plain">, </span><span class="identifier">P</span><span class="plain">);</span>
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<span class="functiontext">Str::copy_to_locale_string</span><span class="plain">(</span><span class="identifier">D</span><span class="plain">-></span><span class="element">directory_name_written_out</span><span class="plain">, </span><span class="identifier">pn</span><span class="plain">, </span><span class="constant">4</span><span class="plain">*</span><span class="constant">MAX_FILENAME_LENGTH</span><span class="plain">);</span>
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<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">pn</span><span class="plain">);</span>
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<span class="identifier">D</span><span class="plain">-></span><span class="element">directory_handle</span><span class="plain"> = </span><span class="functiontext">Platform::opendir</span><span class="plain">(</span><span class="identifier">D</span><span class="plain">-></span><span class="element">directory_name_written_out</span><span class="plain">);</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">D</span><span class="plain">-></span><span class="element">directory_handle</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">NULL</span><span class="plain">;</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">D</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">Directories::next</span><span class="plain">(</span><span class="reserved">scan_directory</span><span class="plain"> *</span><span class="identifier">D</span><span class="plain">, </span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">leafname</span><span class="plain">) {</span>
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<span class="reserved">char</span><span class="plain"> </span><span class="identifier">leafname_Cs</span><span class="plain">[</span><span class="constant">MAX_FILENAME_LENGTH</span><span class="plain">];</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">rv</span><span class="plain"> = </span><span class="constant">TRUE</span><span class="plain">;</span>
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<span class="reserved">while</span><span class="plain"> (</span><span class="identifier">rv</span><span class="plain">) {</span>
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<span class="identifier">rv</span><span class="plain"> = </span><span class="functiontext">Platform::readdir</span><span class="plain">(</span><span class="identifier">D</span><span class="plain">-></span><span class="element">directory_handle</span><span class="plain">, </span><span class="identifier">D</span><span class="plain">-></span><span class="element">directory_name_written_out</span><span class="plain">, </span><span class="identifier">leafname_Cs</span><span class="plain">);</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">leafname_Cs</span><span class="plain">[0] != </span><span class="character">'.'</span><span class="plain">) </span><span class="reserved">break</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="functiontext">Str::clear</span><span class="plain">(</span><span class="identifier">leafname</span><span class="plain">);</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">rv</span><span class="plain">) </span><span class="functiontext">Streams::write_locale_string</span><span class="plain">(</span><span class="identifier">leafname</span><span class="plain">, </span><span class="identifier">leafname_Cs</span><span class="plain">);</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">rv</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Directories::close</span><span class="plain">(</span><span class="reserved">scan_directory</span><span class="plain"> *</span><span class="identifier">D</span><span class="plain">) {</span>
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<span class="functiontext">Platform::closedir</span><span class="plain">(</span><span class="identifier">D</span><span class="plain">-></span><span class="element">directory_handle</span><span class="plain">);</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Directories::open appears nowhere else.</p>
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<p class="endnote">The function Directories::next appears nowhere else.</p>
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<p class="endnote">The function Directories::close appears nowhere else.</p>
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