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117 lines
4.8 KiB
HTML
117 lines
4.8 KiB
HTML
4 years ago
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<title>vfscanf (The Red Hat newlib C Library)</title>
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<meta name="description" content="vfscanf (The Red Hat newlib C Library)">
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<body lang="en">
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<a name="vfscanf"></a>
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<div class="header">
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<p>
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Next: <a href="vfwprintf.html#vfwprintf" accesskey="n" rel="next">vfwprintf</a>, Previous: <a href="vfprintf.html#vfprintf" accesskey="p" rel="prev">vfprintf</a>, Up: <a href="Stdio.html#Stdio" accesskey="u" rel="up">Stdio</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="vfscanf_002c-vscanf_002c-vsscanf_002d_002d_002dformat-argument-list"></a>
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<h3 class="section">4.71 <code>vfscanf</code>, <code>vscanf</code>, <code>vsscanf</code>—format argument list</h3>
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<a name="index-vfscanf"></a>
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<a name="index-_005fvfscanf_005fr"></a>
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<a name="index-vscanf"></a>
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<a name="index-_005fvscanf_005fr"></a>
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<a name="index-vsscanf"></a>
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<a name="index-_005fvsscanf_005fr"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <stdio.h>
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#include <stdarg.h>
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int vscanf(const char *<var>fmt</var>, va_list <var>list</var>);
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int vfscanf(FILE *<var>fp</var>, const char *<var>fmt</var>, va_list <var>list</var>);
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int vsscanf(const char *<var>str</var>, const char *<var>fmt</var>, va_list <var>list</var>);
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int _vscanf_r(struct _reent *<var>reent</var>, const char *<var>fmt</var>,
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va_list <var>list</var>);
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int _vfscanf_r(struct _reent *<var>reent</var>, FILE *<var>fp</var>, const char *<var>fmt</var>,
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va_list <var>list</var>);
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int _vsscanf_r(struct _reent *<var>reent</var>, const char *<var>str</var>,
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const char *<var>fmt</var>, va_list <var>list</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>vscanf</code>, <code>vfscanf</code>, and <code>vsscanf</code> are (respectively) variants
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of <code>scanf</code>, <code>fscanf</code>, and <code>sscanf</code>. They differ only in
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allowing their caller to pass the variable argument list as a
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<code>va_list</code> object (initialized by <code>va_start</code>) rather than
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directly accepting a variable number of arguments.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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The return values are consistent with the corresponding functions:
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<code>vscanf</code> returns the number of input fields successfully scanned,
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converted, and stored; the return value does not include scanned
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fields which were not stored.
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</p>
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<p>If <code>vscanf</code> attempts to read at end-of-file, the return value
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is <code>EOF</code>.
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</p>
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<p>If no fields were stored, the return value is <code>0</code>.
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</p>
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<p>The routines <code>_vscanf_r</code>, <code>_vfscanf_f</code>, and <code>_vsscanf_r</code> are
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reentrant versions which take an additional first parameter which points to the
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reentrancy structure.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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These are GNU extensions.
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</p>
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<p>Supporting OS subroutines required:
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</p>
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<br>
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</body>
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</html>
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