savelij13
e400c8c902
- Added f_truncate(). - Added f_utime(). - Fixed off by one error at FAT sub-type determination. - Fixed btr in f_read() can be mistruncated. - Fixed cached sector is not flushed when create and close without write.
92 lines
3.1 KiB
HTML
92 lines
3.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta http-equiv="Content-Style-Type" content="text/css">
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<link rel="up" title="FatFs" href="../00index_e.html">
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<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">
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<title>FatFs - f_getfree</title>
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</head>
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<body>
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<div class="para">
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<h2>f_getfree</h2>
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<p>The f_getfree function gets number of the free clusters.</p>
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<pre>
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FRESULT f_getfree (
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const char* <em>Path</em>, /* Root directory of the drive */
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DWORD* <em>Clusters</em>, /* Pointer to the variable to store number of free clusters */
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FATFS** <em>FileSystemObject</em> /* Pointer to pointer to file system object */
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);
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</pre>
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</div>
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<div class="para">
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<h4>Parameters</h4>
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<dl class="par">
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<dt>Path</dt>
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<dd>Pinter to the null-terminated string that specifies the <a href="filename.html">root directory</a> of the logical drive. Always specify a null-string for Tiny-FatFs.</dd>
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<dt>Clusters</dt>
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<dd>Pointer to the DWORD variable to store number of free clusters.</dd>
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<dt>FileSystemObject</dt>
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<dd>Pointer to pointer that to store a pointer to the corresponding file system object.</dd>
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</dl>
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</div>
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<div class="para">
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<h4>Return Values</h4>
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<dl class="ret">
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<dt>FR_OK (0)</dt>
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<dd>The function succeeded. The <tt><em>*Clusters</em></tt> has number of free clusters and <tt><em>*FileSystemObject</em></tt> points the file system object.</dd>
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<dt>FR_INVALID_DRIVE</dt>
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<dd>The drive number is invalid.</dd>
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<dt>FR_NOT_READY</dt>
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<dd>The disk drive cannot work due to no medium in the drive or any other reason.</dd>
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<dt>FR_RW_ERROR</dt>
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<dd>The function failed due to a disk error or an internal error.</dd>
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<dt>FR_NOT_ENABLED</dt>
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<dd>The logical drive has no work area.</dd>
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<dt>FR_NO_FILESYSTEM</dt>
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<dd>There is no valid FAT partition on the disk.</dd>
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</dl>
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</div>
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<div class="para">
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<h4>Descriptions</h4>
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<p>The f_getfree function gets number of free clusters on the drive. The <tt>sects_clust</tt> member in the file system object is refreting number of sectors per cluster, so that the free space in unit of sector can be calcurated with this. When <tt>_USE_FSINFO</tt> option is enabled, this function might return an inaccurate free cluster count on FAT32 volume. When it is disabled, this function will take a time on FAT32 volume.</p>
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<p>This function is not supported in read-only configuration and minimization level of >= 1.</p>
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</div>
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<div class="para">
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<h4>Example</h4>
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<pre>
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FATFS *fs;
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DWORD clust;
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// Get free clusters
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res = f_getfree("", &clust, &fs);
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if (res) die(res);
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// Get free space
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printf("%lu KB total disk space.\n"
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"%lu KB available on the disk.\n",
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(DWORD)(fs->max_clust - 2) * fs->sects_clust / 2,
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clust * fs->sects_clust / 2);
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</pre>
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</div>
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<div class="para">
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<h4>References</h4>
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<p><tt><a href="sfatfs.html">FATFS</a></tt></p>
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</div>
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<p class="foot"><a href="../00index_e.html">Return</a></p>
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</body>
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</html>
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