1<html lang="en"> 2<head> 3<title>vfscanf - Untitled</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Untitled"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="Stdio.html#Stdio" title="Stdio"> 9<link rel="prev" href="vfprintf.html#vfprintf" title="vfprintf"> 10<link rel="next" href="vfwprintf.html#vfwprintf" title="vfwprintf"> 11<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 12<meta http-equiv="Content-Style-Type" content="text/css"> 13<style type="text/css"><!-- 14 pre.display { font-family:inherit } 15 pre.format { font-family:inherit } 16 pre.smalldisplay { font-family:inherit; font-size:smaller } 17 pre.smallformat { font-family:inherit; font-size:smaller } 18 pre.smallexample { font-size:smaller } 19 pre.smalllisp { font-size:smaller } 20 span.sc { font-variant:small-caps } 21 span.roman { font-family:serif; font-weight:normal; } 22 span.sansserif { font-family:sans-serif; font-weight:normal; } 23--></style> 24<link rel="stylesheet" type="text/css" href="../cs.css"> 25</head> 26<body> 27<div class="node"> 28<a name="vfscanf"></a> 29<p> 30Next: <a rel="next" accesskey="n" href="vfwprintf.html#vfwprintf">vfwprintf</a>, 31Previous: <a rel="previous" accesskey="p" href="vfprintf.html#vfprintf">vfprintf</a>, 32Up: <a rel="up" accesskey="u" href="Stdio.html#Stdio">Stdio</a> 33<hr> 34</div> 35 36<h3 class="section">4.69 <code>vfscanf</code>, <code>vscanf</code>, <code>vsscanf</code>—format argument list</h3> 37 38<p><a name="index-vfscanf-337"></a><a name="index-g_t_005fvfscanf_005fr-338"></a><a name="index-vscanf-339"></a><a name="index-g_t_005fvscanf_005fr-340"></a><a name="index-vsscanf-341"></a><a name="index-g_t_005fvsscanf_005fr-342"></a><strong>Synopsis</strong> 39<pre class="example"> #include <stdio.h> 40 #include <stdarg.h> 41 int vscanf(const char *<var>fmt</var>, va_list <var>list</var>); 42 int vfscanf(FILE *<var>fp</var>, const char *<var>fmt</var>, va_list <var>list</var>); 43 int vsscanf(const char *<var>str</var>, const char *<var>fmt</var>, va_list <var>list</var>); 44 45 int _vscanf_r(struct _reent *<var>reent</var>, const char *<var>fmt</var>, 46 va_list <var>list</var>); 47 int _vfscanf_r(struct _reent *<var>reent</var>, FILE *<var>fp</var>, const char *<var>fmt</var>, 48 va_list <var>list</var>); 49 int _vsscanf_r(struct _reent *<var>reent</var>, const char *<var>str</var>, 50 const char *<var>fmt</var>, va_list <var>list</var>); 51 52</pre> 53 <p><strong>Description</strong><br> 54<code>vscanf</code>, <code>vfscanf</code>, and <code>vsscanf</code> are (respectively) variants 55of <code>scanf</code>, <code>fscanf</code>, and <code>sscanf</code>. They differ only in 56allowing their caller to pass the variable argument list as a 57<code>va_list</code> object (initialized by <code>va_start</code>) rather than 58directly accepting a variable number of arguments. 59 60 <p><br> 61<strong>Returns</strong><br> 62The return values are consistent with the corresponding functions: 63<code>vscanf</code> returns the number of input fields successfully scanned, 64converted, and stored; the return value does not include scanned 65fields which were not stored. 66 67 <p>If <code>vscanf</code> attempts to read at end-of-file, the return value 68is <code>EOF</code>. 69 70 <p>If no fields were stored, the return value is <code>0</code>. 71 72 <p>The routines <code>_vscanf_r</code>, <code>_vfscanf_f</code>, and <code>_vsscanf_r</code> are 73reentrant versions which take an additional first parameter which points to the 74reentrancy structure. 75 76 <p><br> 77<strong>Portability</strong><br> 78These are GNU extensions. 79 80 <p>Supporting OS subroutines required: 81 82 <p><br> 83 84 </body></html> 85 86