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| <a href="../fs_opendir/">fs_opendir</a> |
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| <a href="../fs_read/">fs_read</a> |
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| <a href="./">fs_readdir</a> |
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| <a href="../fs_register/">fs_register</a> |
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| |
| <h2 id="fs_readdir"><font color="#F2853F" style="font-size:24pt">fs_readdir</font></h2> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">int</span> <span style="color: #000000">fs_readdir</span>(<span style="color: #A90D91">struct</span> <span style="color: #3F6E75">fs_dir</span> <span style="color: #000000">*dir</span>, <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">fs_dirent</span> <span style="color: #000000">**out_dirent</span>); |
| </code></pre></div> |
| |
| <p>Reads the next entry in an open directory. </p> |
| <h4 id="arguments">Arguments</h4> |
| <table> |
| <thead> |
| <tr> |
| <th><em>Argument</em></th> |
| <th><em>Description</em></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>dir</td> |
| <td>The directory handle to read from</td> |
| </tr> |
| <tr> |
| <td>out_dirent</td> |
| <td>On success, points to the next child entry in the specified directory</td> |
| </tr> |
| </tbody> |
| </table> |
| <h4 id="returned-values">Returned values</h4> |
| <ul> |
| <li>0 on success</li> |
| <li>FS_ENOENT if there are no more entries in the parent directory</li> |
| <li>Other <a href="../fs_return_codes/">FS error code</a> on error.</li> |
| </ul> |
| <h4 id="header-file">Header file</h4> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #633820">#include</span> <span style="color: #177500">"fs/fs.h"</span> |
| </code></pre></div> |
| |
| <h4 id="example">Example</h4> |
| <p>This example iterates through the contents of a directory, printing the name of each child node. When the traversal is complete, the code closes the directory handle.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">int</span> |
| <span style="color: #000000">traverse_dir</span>(<span style="color: #A90D91">const</span> <span style="color: #A90D91">char</span> <span style="color: #000000">*dirname</span>) |
| { |
| <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">fs_dirent</span> <span style="color: #000000">*dirent</span>; |
| <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">fs_dir</span> <span style="color: #000000">*dir</span>; |
| <span style="color: #A90D91">char</span> <span style="color: #000000">buf</span>[<span style="color: #1C01CE">64</span>]; |
| <span style="color: #A90D91">uint8_t</span> <span style="color: #000000">name_len</span>; |
| <span style="color: #A90D91">int</span> <span style="color: #000000">rc</span>; |
| |
| <span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">fs_opendir</span>(<span style="color: #000000">dirname</span>, <span style="color: #000000">&dir</span>); |
| <span style="color: #A90D91">if</span> (<span style="color: #000000">rc</span> <span style="color: #000000">!=</span> <span style="color: #1C01CE">0</span>) { |
| <span style="color: #A90D91">return</span> <span style="color: #1C01CE">-1</span>; |
| } |
| |
| <span style="color: #177500">/* Iterate through the parent directory, printing the name of each child</span> |
| <span style="color: #177500"> * entry. The loop only terminates via a function return.</span> |
| <span style="color: #177500"> */</span> |
| <span style="color: #A90D91">while</span> (<span style="color: #1C01CE">1</span>) { |
| <span style="color: #177500">/* Retrieve the next child node. */</span> |
| <span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">fs_readdir</span>(<span style="color: #000000">dir</span>, <span style="color: #000000">&dirent</span>); |
| <span style="color: #A90D91">if</span> (<span style="color: #000000">rc</span> <span style="color: #000000">==</span> <span style="color: #000000">FS_ENOENT</span>) { |
| <span style="color: #177500">/* Traversal complete. */</span> |
| <span style="color: #A90D91">return</span> <span style="color: #1C01CE">0</span>; |
| } <span style="color: #A90D91">else</span> <span style="color: #A90D91">if</span> (<span style="color: #000000">rc</span> <span style="color: #000000">!=</span> <span style="color: #1C01CE">0</span>) { |
| <span style="color: #177500">/* Unexpected error. */</span> |
| <span style="color: #A90D91">return</span> <span style="color: #1C01CE">-1</span>; |
| } |
| |
| <span style="color: #177500">/* Read the child node's name from the file system. */</span> |
| <span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">fs_dirent_name</span>(<span style="color: #000000">dirent</span>, <span style="color: #A90D91">sizeof</span> <span style="color: #000000">buf</span>, <span style="color: #000000">buf</span>, <span style="color: #000000">&name_len</span>); |
| <span style="color: #A90D91">if</span> (<span style="color: #000000">rc</span> <span style="color: #000000">!=</span> <span style="color: #1C01CE">0</span>) { |
| <span style="color: #A90D91">return</span> <span style="color: #1C01CE">-1</span>; |
| } |
| |
| <span style="color: #177500">/* Print the child node's name to the console. */</span> |
| <span style="color: #A90D91">if</span> (<span style="color: #000000">fs_dirent_is_dir</span>(<span style="color: #000000">dirent</span>)) { |
| <span style="color: #000000">console_printf</span>(<span style="color: #C41A16">" dir: "</span>); |
| } <span style="color: #A90D91">else</span> { |
| <span style="color: #000000">console_printf</span>(<span style="color: #C41A16">"file: "</span>); |
| } |
| <span style="color: #000000">console_printf</span>(<span style="color: #C41A16">"%s\n"</span>, <span style="color: #000000">buf</span>); |
| } |
| } |
| </code></pre></div> |
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