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116 lines
4.7 KiB
HTML
116 lines
4.7 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>viscanf (The Red Hat newlib C Library)</title>
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<meta name="description" content="viscanf (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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<link href="Stdio.html#Stdio" rel="up" title="Stdio">
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<link href="Strings.html#Strings" rel="next" title="Strings">
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</head>
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<body lang="en">
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<a name="viscanf"></a>
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<div class="header">
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<p>
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Previous: <a href="viprintf.html#viprintf" accesskey="p" rel="prev">viprintf</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="viscanf_002c-vfiscanf_002c-vsiscanf_002d_002d_002dformat-argument-list"></a>
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<h3 class="section">4.75 <code>viscanf</code>, <code>vfiscanf</code>, <code>vsiscanf</code>—format argument list</h3>
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<a name="index-viscanf"></a>
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<a name="index-_005fviscanf_005fr"></a>
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<a name="index-vfiscanf"></a>
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<a name="index-_005fvfiscanf_005fr"></a>
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<a name="index-vsiscanf"></a>
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<a name="index-_005fvsiscanf_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 viscanf(const char *<var>fmt</var>, va_list <var>list</var>);
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int vfiscanf(FILE *<var>fp</var>, const char *<var>fmt</var>, va_list <var>list</var>);
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int vsiscanf(const char *<var>str</var>, const char *<var>fmt</var>, va_list <var>list</var>);
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int _viscanf_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 _vfiscanf_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 _vsiscanf_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>viscanf</code>, <code>vfiscanf</code>, and <code>vsiscanf</code> are (respectively) variants
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of <code>iscanf</code>, <code>fiscanf</code>, and <code>siscanf</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>viscanf</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>viscanf</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>_viscanf_r</code>, <code>_vfiscanf_f</code>, and <code>_vsiscanf_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 newlib 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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