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<a name="viscanf_002c-vfiscanf_002c-vsiscanf_002d_002d_002dformat-argument-list"></a>
<h3 class="section">4.75 <code>viscanf</code>, <code>vfiscanf</code>, <code>vsiscanf</code>&mdash;format argument list</h3>
<a name="index-viscanf"></a>
<a name="index-_005fviscanf_005fr"></a>
<a name="index-vfiscanf"></a>
<a name="index-_005fvfiscanf_005fr"></a>
<a name="index-vsiscanf"></a>
<a name="index-_005fvsiscanf_005fr"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;stdio.h&gt;
#include &lt;stdarg.h&gt;
int viscanf(const char *<var>fmt</var>, va_list <var>list</var>);
int vfiscanf(FILE *<var>fp</var>, const char *<var>fmt</var>, va_list <var>list</var>);
int vsiscanf(const char *<var>str</var>, const char *<var>fmt</var>, va_list <var>list</var>);

int _viscanf_r(struct _reent *<var>reent</var>, const char *<var>fmt</var>, 
    va_list <var>list</var>);
int _vfiscanf_r(struct _reent *<var>reent</var>, FILE *<var>fp</var>, const char *<var>fmt</var>, 
    va_list <var>list</var>);
int _vsiscanf_r(struct _reent *<var>reent</var>, const char *<var>str</var>,
    const char *<var>fmt</var>, va_list <var>list</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>viscanf</code>, <code>vfiscanf</code>, and <code>vsiscanf</code> are (respectively) variants
of <code>iscanf</code>, <code>fiscanf</code>, and <code>siscanf</code>.  They differ only in 
allowing their caller to pass the variable argument list as a 
<code>va_list</code> object (initialized by <code>va_start</code>) rather than 
directly accepting a variable number of arguments.
</p>
<br>
<p><strong>Returns</strong><br>
The return values are consistent with the corresponding functions:
<code>viscanf</code> returns the number of input fields successfully scanned,
converted, and stored; the return value does not include scanned
fields which were not stored.  
</p>
<p>If <code>viscanf</code> attempts to read at end-of-file, the return value 
is <code>EOF</code>.
</p>
<p>If no fields were stored, the return value is <code>0</code>.
</p>
<p>The routines <code>_viscanf_r</code>, <code>_vfiscanf_f</code>, and <code>_vsiscanf_r</code> are
reentrant versions which take an additional first parameter which points to the
reentrancy structure.
</p>
<br>
<p><strong>Portability</strong><br>
These are newlib extensions.
</p>
<p>Supporting OS subroutines required:
</p>
<br>


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