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.
64 lines
1.8 KiB
HTML
64 lines
1.8 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_truncate</title>
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</head>
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<body>
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<div class="para">
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<h2>f_truncate</h2>
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<p>The f_truncate function truncates the file size.</p>
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<pre>
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FRESULT f_truncate (
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FIL* <em>FileObject</em> /* Pointer to the file 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>FileObject</dt>
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<dd>Pointer to the open file object to be truncated.</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.</dd>
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<dt>FR_DENIED</dt>
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<dd>The file has been opened in read-only mode.</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_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_INVALID_OBJECT</dt>
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<dd>The file object is invalid.</dd>
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</dl>
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</div>
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<div class="para">
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<h4>Description</h4>
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<p>The f_truncate function truncates the file size to the current file R/W point. When the file R/W pointer is pointing end of the file, there is no effect. 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>References</h4>
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<p><tt><a href="open.html">f_open</a>, <a href="lseek.html">f_lseek</a>, <a href="sfile.html">FIL</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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