?? truncate.html
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<title>FatFs - f_truncate</title>
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<div class="para">
<h2>f_truncate</h2>
<p>The f_truncate function truncates the file size.</p>
<pre>
FRESULT f_truncate (
FIL* <em>FileObject</em> /* Pointer to the file object */
);
</pre>
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<div class="para">
<h4>Parameter</h4>
<dl class="par">
<dt>FileObject</dt>
<dd>Pointer to the open file object to be truncated.</dd>
</dl>
</div>
<div class="para">
<h4>Return Values</h4>
<dl class="ret">
<dt>FR_OK (0)</dt>
<dd>The function succeeded.</dd>
<dt>FR_DENIED</dt>
<dd>The file has been opened in read-only mode.</dd>
<dt>FR_RW_ERROR</dt>
<dd>The function failed due to a disk error or an internal error.</dd>
<dt>FR_NOT_READY</dt>
<dd>The disk drive cannot work due to no medium in the drive or any other reason.</dd>
<dt>FR_INVALID_OBJECT</dt>
<dd>The file object is invalid.</dd>
</dl>
</div>
<div class="para">
<h4>Description</h4>
<p>The f_truncate function truncates the file size to the current file R/W point. When the file R/W pointer is already 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 class="para">
<h4>References</h4>
<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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