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| <div class="section" id="fs-readdir"> |
| <h1>fs_readdir<a class="headerlink" href="#fs-readdir" title="Permalink to this headline">¶</a></h1> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="kt">int</span><span class="w"> </span><span class="nf">fs_readdir</span><span class="p">(</span><span class="k">struct</span><span class="w"> </span><span class="nc">fs_dir</span><span class="w"> </span><span class="o">*</span><span class="n">dir</span><span class="p">,</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">fs_dirent</span><span class="w"> </span><span class="o">**</span><span class="n">out_dirent</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <p>Reads the next entry in an open directory.</p> |
| <div class="section" id="arguments"> |
| <h2>Arguments<a class="headerlink" href="#arguments" title="Permalink to this headline">¶</a></h2> |
| <table class="docutils align-default"> |
| <colgroup> |
| <col style="width: 47%" /> |
| <col style="width: 53%" /> |
| </colgroup> |
| <thead> |
| <tr class="row-odd"><th class="head"><p><em>Argument</em></p></th> |
| <th class="head"><p><em>Description</em></p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>dir</p></td> |
| <td><p>The directory |
| handle to read |
| from</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>out_dirent</p></td> |
| <td><p>On success, |
| points to the |
| next child |
| entry in the |
| specified |
| directory</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="returned-values"> |
| <h2>Returned values<a class="headerlink" href="#returned-values" title="Permalink to this headline">¶</a></h2> |
| <ul class="simple"> |
| <li><p>0 on success</p></li> |
| <li><p>FS_ENOENT if there are no more entries in the parent directory</p></li> |
| <li><p>Other <a class="reference external" href="fs_return_codes.html">FS error code</a> on error.</p></li> |
| </ul> |
| </div> |
| <div class="section" id="header-file"> |
| <h2>Header file<a class="headerlink" href="#header-file" title="Permalink to this headline">¶</a></h2> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf">"fs/fs.h"</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="example"> |
| <h2>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2> |
| <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="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="kt">int</span> |
| <span class="nf">traverse_dir</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="o">*</span><span class="n">dirname</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">fs_dirent</span><span class="w"> </span><span class="o">*</span><span class="n">dirent</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">fs_dir</span><span class="w"> </span><span class="o">*</span><span class="n">dir</span><span class="p">;</span> |
| <span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="n">buf</span><span class="p">[</span><span class="mi">64</span><span class="p">];</span> |
| <span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">name_len</span><span class="p">;</span> |
| <span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">rc</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="n">rc</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">fs_opendir</span><span class="p">(</span><span class="n">dirname</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">dir</span><span class="p">);</span> |
| <span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">rc</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">-1</span><span class="p">;</span> |
| <span class="w"> </span><span class="p">}</span> |
| |
| <span class="w"> </span><span class="cm">/* Iterate through the parent directory, printing the name of each child</span> |
| <span class="cm"> * entry. The loop only terminates via a function return.</span> |
| <span class="cm"> */</span> |
| <span class="w"> </span><span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="cm">/* Retrieve the next child node. */</span> |
| <span class="w"> </span><span class="n">rc</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">fs_readdir</span><span class="p">(</span><span class="n">dir</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">dirent</span><span class="p">);</span> |
| <span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">rc</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">FS_ENOENT</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="cm">/* Traversal complete. */</span> |
| <span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span> |
| <span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">rc</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="cm">/* Unexpected error. */</span> |
| <span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">-1</span><span class="p">;</span> |
| <span class="w"> </span><span class="p">}</span> |
| |
| <span class="w"> </span><span class="cm">/* Read the child node's name from the file system. */</span> |
| <span class="w"> </span><span class="n">rc</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">fs_dirent_name</span><span class="p">(</span><span class="n">dirent</span><span class="p">,</span><span class="w"> </span><span class="k">sizeof</span><span class="w"> </span><span class="n">buf</span><span class="p">,</span><span class="w"> </span><span class="n">buf</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">name_len</span><span class="p">);</span> |
| <span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">rc</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">-1</span><span class="p">;</span> |
| <span class="w"> </span><span class="p">}</span> |
| |
| <span class="w"> </span><span class="cm">/* Print the child node's name to the console. */</span> |
| <span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">fs_dirent_is_dir</span><span class="p">(</span><span class="n">dirent</span><span class="p">))</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">console_printf</span><span class="p">(</span><span class="s">" dir: "</span><span class="p">);</span> |
| <span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">console_printf</span><span class="p">(</span><span class="s">"file: "</span><span class="p">);</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="w"> </span><span class="n">console_printf</span><span class="p">(</span><span class="s">"%s</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="n">buf</span><span class="p">);</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| </div> |
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