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| <div class="section" id="fs-open"> |
| <h1>fs_open<a class="headerlink" href="#fs-open" 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="n">fs_open</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">filename</span><span class="p">,</span><span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">access_flags</span><span class="p">,</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">fs_file</span><span class="w"> </span><span class="o">**</span><span class="n">out_file</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <p>Opens a file at the specified path. The result of opening a nonexistent |
| file depends on the access flags specified. All intermediate directories |
| must already exist.</p> |
| <p>The access flags are best understood by comparing them to their |
| equivalent mode strings accepted by the C standard library function |
| <code class="docutils literal notranslate"><span class="pre">fopen()</span></code>. The mode strings passed to <code class="docutils literal notranslate"><span class="pre">fopen()</span></code> map to |
| <code class="docutils literal notranslate"><span class="pre">fs_open()</span></code>’s access flags as follows:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">"r" - FS_ACCESS_READ</span> |
| <span class="go">"r+" - FS_ACCESS_READ | FS_ACCESS_WRITE</span> |
| <span class="go">"w" - FS_ACCESS_WRITE | FS_ACCESS_TRUNCATE</span> |
| <span class="go">"w+" - FS_ACCESS_READ | FS_ACCESS_WRITE | FS_ACCESS_TRUNCATE</span> |
| <span class="go">"a" - FS_ACCESS_WRITE | FS_ACCESS_APPEND</span> |
| <span class="go">"a+" - FS_ACCESS_READ | FS_ACCESS_WRITE | FS_ACCESS_APPEND</span> |
| </pre></div> |
| </div> |
| <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: 45%" /> |
| <col style="width: 55%" /> |
| </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>filename</p></td> |
| <td><p>Null-terminate |
| d |
| string |
| indicating the |
| full path of |
| the file to |
| open</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>access_fla |
| gs</p></td> |
| <td><p>Flags |
| controlling |
| file access; |
| see above |
| table</p></td> |
| </tr> |
| <tr class="row-even"><td><p>out_file</p></td> |
| <td><p>On success, a |
| pointer to the |
| newly-created |
| file handle |
| gets written |
| here</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><a class="reference external" href="fs_return_codes.html">FS error code</a> on failure</p></li> |
| </ul> |
| </div> |
| <div class="section" id="notes"> |
| <h2>Notes<a class="headerlink" href="#notes" title="Permalink to this headline">¶</a></h2> |
| <ul class="simple"> |
| <li><p>There is no concept of current working directory. Therefore all file |
| names should start with ‘/’.</p></li> |
| <li><p>Always close files when you are done using them. If you forget to |
| close a file, the file stays open forever. Do this too many times, |
| and the underlying file system will run out of file handles, causing |
| subsequent open operations to fail. This type of bug is known as a |
| file handle leak or a file descriptor leak.</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>The below code opens the file <code class="docutils literal notranslate"><span class="pre">/settings/config.txt</span></code> for reading, |
| reads some data, and then closes the file.</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="kt">int</span> |
| <span class="nf">read_config</span><span class="p">(</span><span class="kt">void</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_file</span><span class="w"> </span><span class="o">*</span><span class="n">file</span><span class="p">;</span> |
| <span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">bytes_read</span><span class="p">;</span> |
| <span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">buf</span><span class="p">[</span><span class="mi">16</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="cm">/* Open the file for reading. */</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_open</span><span class="p">(</span><span class="s">"/settings/config.txt"</span><span class="p">,</span><span class="w"> </span><span class="n">FS_ACCESS_READ</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">file</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">/* Read up to 16 bytes from the file. */</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_read</span><span class="p">(</span><span class="n">file</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">bytes_read</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="cm">/* buf now contains up to 16 bytes of file data. */</span> |
| <span class="w"> </span><span class="n">console_printf</span><span class="p">(</span><span class="s">"read %u bytes</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="n">bytes_read</span><span class="p">)</span> |
| <span class="w"> </span><span class="p">}</span> |
| |
| <span class="w"> </span><span class="cm">/* Close the file. */</span> |
| <span class="w"> </span><span class="n">fs_close</span><span class="p">(</span><span class="n">file</span><span class="p">);</span> |
| |
| <span class="w"> </span><span class="k">return</span><span class="w"> </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="w"> </span><span class="o">?</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="mi">-1</span><span class="p">;</span> |
| <span class="p">}</span> |
| </pre></div> |
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