1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> 2<html lang="en"> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 5<meta http-equiv="Content-Style-Type" content="text/css"> 6<link rel="up" title="FatFs" href="../00index_e.html"> 7<link rel="alternate" hreflang="ja" title="Japanese" href="../ja/truncate.html"> 8<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default"> 9<title>FatFs - f_truncate</title> 10</head> 11 12<body> 13 14<div class="para func"> 15<h2>f_truncate</h2> 16<p>The f_truncate function truncates the file size.</p> 17<pre> 18FRESULT f_truncate ( 19 FIL* <span class="arg">fp</span> <span class="c">/* [IN] File object */</span> 20); 21</pre> 22</div> 23 24<div class="para arg"> 25<h4>Parameter</h4> 26<dl class="par"> 27<dt>fp</dt> 28<dd>Pointer to the open file object to be truncated.</dd> 29</dl> 30</div> 31 32 33<div class="para ret"> 34<h4>Return Values</h4> 35<p> 36<a href="rc.html#ok">FR_OK</a>, 37<a href="rc.html#de">FR_DISK_ERR</a>, 38<a href="rc.html#ie">FR_INT_ERR</a>, 39<a href="rc.html#dn">FR_DENIED</a>, 40<a href="rc.html#io">FR_INVALID_OBJECT</a>, 41<a href="rc.html#tm">FR_TIMEOUT</a> 42</p> 43</div> 44 45 46<div class="para desc"> 47<h4>Description</h4> 48<p>The <tt>f_truncate</tt> function truncates the file size to the current file read/write pointer. This function has no effect if the file read/write pointer is already pointing end of the file.</p> 49</div> 50 51 52<div class="para comp"> 53<h4>QuickInfo</h4> 54<p>Available when <tt><a href="config.html#fs_readonly">FF_FS_READONLY</a> == 0</tt> and <tt><a href="config.html#fs_minimize">FF_FS_MINIMIZE</a> == 0</tt>.</p> 55</div> 56 57 58<div class="para ref"> 59<h4>See Also</h4> 60<p><tt><a href="open.html">f_open</a>, <a href="lseek.html">f_lseek</a>, <a href="sfile.html">FIL</a></tt></p> 61</div> 62 63 64<p class="foot"><a href="../00index_e.html">Return</a></p> 65</body> 66</html> 67