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="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default"> 7<title>FatFs - f_truncate</title> 8</head> 9 10<body> 11 12<div class="para func"> 13<h2>f_truncate</h2> 14<p>The f_truncate function truncates the file size.</p> 15<pre> 16FRESULT f_truncate ( 17 FIL* <span class="arg">fp</span> <span class="c">/* [IN] File object */</span> 18); 19</pre> 20</div> 21 22<div class="para arg"> 23<h4>Parameter</h4> 24<dl class="par"> 25<dt>fp</dt> 26<dd>Pointer to the open file object to be truncated. If a null pointer is given, the function fails with <tt>FR_INVALID_OBJECT</tt>.</dd> 27</dl> 28</div> 29 30 31<div class="para ret"> 32<h4>Return Values</h4> 33<p> 34<a href="rc.html#ok">FR_OK</a>, 35<a href="rc.html#de">FR_DISK_ERR</a>, 36<a href="rc.html#ie">FR_INT_ERR</a>, 37<a href="rc.html#dn">FR_DENIED</a>, 38<a href="rc.html#io">FR_INVALID_OBJECT</a>, 39<a href="rc.html#tm">FR_TIMEOUT</a> 40</p> 41</div> 42 43 44<div class="para desc"> 45<h4>Description</h4> 46<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> 47</div> 48 49 50<div class="para comp"> 51<h4>QuickInfo</h4> 52<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> 53</div> 54 55 56<div class="para ref"> 57<h4>See Also</h4> 58<p><tt><a href="open.html">f_open</a>, <a href="lseek.html">f_lseek</a>, <a href="sfile.html">FIL</a></tt></p> 59</div> 60 61 62<p class="foot"><a href="../00index_e.html">Return</a></p> 63</body> 64</html> 65