1<html lang="en"> 2<head> 3<title>viscanf - 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="viprintf.html#viprintf" title="viprintf"> 10<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 11<meta http-equiv="Content-Style-Type" content="text/css"> 12<style type="text/css"><!-- 13 pre.display { font-family:inherit } 14 pre.format { font-family:inherit } 15 pre.smalldisplay { font-family:inherit; font-size:smaller } 16 pre.smallformat { font-family:inherit; font-size:smaller } 17 pre.smallexample { font-size:smaller } 18 pre.smalllisp { font-size:smaller } 19 span.sc { font-variant:small-caps } 20 span.roman { font-family:serif; font-weight:normal; } 21 span.sansserif { font-family:sans-serif; font-weight:normal; } 22--></style> 23<link rel="stylesheet" type="text/css" href="../cs.css"> 24</head> 25<body> 26<div class="node"> 27<a name="viscanf"></a> 28<p> 29Previous: <a rel="previous" accesskey="p" href="viprintf.html#viprintf">viprintf</a>, 30Up: <a rel="up" accesskey="u" href="Stdio.html#Stdio">Stdio</a> 31<hr> 32</div> 33 34<h3 class="section">4.73 <code>viscanf</code>, <code>vfiscanf</code>, <code>vsiscanf</code>—format argument list</h3> 35 36<p><a name="index-viscanf-367"></a><a name="index-g_t_005fviscanf_005fr-368"></a><a name="index-vfiscanf-369"></a><a name="index-g_t_005fvfiscanf_005fr-370"></a><a name="index-vsiscanf-371"></a><a name="index-g_t_005fvsiscanf_005fr-372"></a><strong>Synopsis</strong> 37<pre class="example"> #include <stdio.h> 38 #include <stdarg.h> 39 int viscanf(const char *<var>fmt</var>, va_list <var>list</var>); 40 int vfiscanf(FILE *<var>fp</var>, const char *<var>fmt</var>, va_list <var>list</var>); 41 int vsiscanf(const char *<var>str</var>, const char *<var>fmt</var>, va_list <var>list</var>); 42 43 int _viscanf_r(struct _reent *<var>reent</var>, const char *<var>fmt</var>, 44 va_list <var>list</var>); 45 int _vfiscanf_r(struct _reent *<var>reent</var>, FILE *<var>fp</var>, const char *<var>fmt</var>, 46 va_list <var>list</var>); 47 int _vsiscanf_r(struct _reent *<var>reent</var>, const char *<var>str</var>, 48 const char *<var>fmt</var>, va_list <var>list</var>); 49 50</pre> 51 <p><strong>Description</strong><br> 52<code>viscanf</code>, <code>vfiscanf</code>, and <code>vsiscanf</code> are (respectively) variants 53of <code>iscanf</code>, <code>fiscanf</code>, and <code>siscanf</code>. They differ only in 54allowing their caller to pass the variable argument list as a 55<code>va_list</code> object (initialized by <code>va_start</code>) rather than 56directly accepting a variable number of arguments. 57 58 <p><br> 59<strong>Returns</strong><br> 60The return values are consistent with the corresponding functions: 61<code>viscanf</code> returns the number of input fields successfully scanned, 62converted, and stored; the return value does not include scanned 63fields which were not stored. 64 65 <p>If <code>viscanf</code> attempts to read at end-of-file, the return value 66is <code>EOF</code>. 67 68 <p>If no fields were stored, the return value is <code>0</code>. 69 70 <p>The routines <code>_viscanf_r</code>, <code>_vfiscanf_f</code>, and <code>_vsiscanf_r</code> are 71reentrant versions which take an additional first parameter which points to the 72reentrancy structure. 73 74 <p><br> 75<strong>Portability</strong><br> 76These are newlib extensions. 77 78 <p>Supporting OS subroutines required: 79 80 <p><br> 81 82 </body></html> 83 84