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<h1 id="firstHeading" class="firstHeading">vscanf, vfscanf, vsscanf, vscanf_s, vfscanf_s, vsscanf_s</h1>
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</table></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Formatted input</td></tr>
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</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>vscanf</span><span>vfscanf</span><span>vsscanf</span><span>vscanf_s</span><span>vfscanf_s</span><span>vsscanf_s</span></span></strong></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vfwscanf.html" title="c/io/vfwscanf"><span class="t-lines"><span>vwscanf</span><span>vfwscanf</span><span>vswscanf</span><span>vwscanf_s</span><span>vfwscanf_s</span><span>vswscanf_s</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div></td></tr>
</table></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Formatted output</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="fprintf.html" title="c/io/fprintf"><span class="t-lines"><span>printf</span><span>fprintf</span><span>sprintf</span><span>snprintf</span><span>printf_s</span><span>fprintf_s</span><span>sprintf_s</span><span>snprintf_s</span></span></a></div><div><span class="t-lines"><span></span><span></span><span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="fwprintf.html" title="c/io/fwprintf"><span class="t-lines"><span>wprintf</span><span>fwprintf</span><span>swprintf</span><span>wprintf_s</span><span>fwprintf_s</span><span>swprintf_s</span><span>snwprintf_s</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span><span><span class="t-mark-rev t-since-c95">(C95)</span></span><span><span class="t-mark-rev t-since-c95">(C95)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vfprintf.html" title="c/io/vfprintf"><span class="t-lines"><span>vprintf</span><span>vfprintf</span><span>vsprintf</span><span>vsnprintf</span><span>vprintf_s</span><span>vfprintf_s</span><span>vsprintf_s</span><span>vsnprintf_s</span></span></a></div><div><span class="t-lines"><span></span><span></span><span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vfwprintf.html" title="c/io/vfwprintf"><span class="t-lines"><span>vwprintf</span><span>vfwprintf</span><span>vswprintf</span><span>vwprintf_s</span><span>vfwprintf_s</span><span>vswprintf_s</span><span>vsnwprintf_s</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span><span><span class="t-mark-rev t-since-c95">(C95)</span></span><span><span class="t-mark-rev t-since-c95">(C95)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div></td></tr>
</table></div></td></tr>
<p><br />
</p>
<tr class="t-nv-h2"><td colspan="5"> File positioning</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="ftell.html" title="c/io/ftell"><span class="t-lines"><span>ftell</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="fseek.html" title="c/io/fseek"><span class="t-lines"><span>fseek</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="rewind.html" title="c/io/rewind"><span class="t-lines"><span>rewind</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Error handling</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="clearerr.html" title="c/io/clearerr"><span class="t-lines"><span>clearerr</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="ferror.html" title="c/io/ferror"><span class="t-lines"><span>ferror</span></span></a></div></div></td></tr>
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<tr class="t-nv-h2"><td colspan="5"> Operations on files</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="remove.html" title="c/io/remove"><span class="t-lines"><span>remove</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="tmpfile.html" title="c/io/tmpfile"><span class="t-lines"><span>tmpfile</span><span>tmpfile_s</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="tmpnam.html" title="c/io/tmpnam"><span class="t-lines"><span>tmpnam</span><span>tmpnam_s</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div></td></tr>
</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:c/io/navbar_content&action=edit">[edit]</a></span></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
<tr class="t-dsc-header">
<td> <div>Defined in header <code><stdio.h></code>
</div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-c99">
<td> <div><span class="mw-geshi c source-c"><span class="kw4">int</span> vscanf<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span><span class="kw4">restrict</span> format, va_list vlist <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (1) </td>
<td> <span class="t-mark-rev t-since-c99">(since C99)</span> </td>
</tr>
<tr class="t-dcl t-since-c99">
<td> <div><span class="mw-geshi c source-c"><span class="kw4">int</span> vfscanf<span class="br0">(</span> <a href="../io.html"><span class="kw881">FILE</span></a> <span class="sy2">*</span><span class="kw4">restrict</span> stream, <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span><span class="kw4">restrict</span> format, <br />
             va_list vlist <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (2) </td>
<td> <span class="t-mark-rev t-since-c99">(since C99)</span> </td>
</tr>
<tr class="t-dcl t-since-c99">
<td> <div><span class="mw-geshi c source-c"><span class="kw4">int</span> vsscanf<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span><span class="kw4">restrict</span> buffer, <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span><span class="kw4">restrict</span> format, <br />
             va_list vlist <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (3) </td>
<td> <span class="t-mark-rev t-since-c99">(since C99)</span> </td>
</tr>
</tbody><tbody>
<tr class="t-dcl t-since-c11">
<td> <div><span class="mw-geshi c source-c"><span class="kw4">int</span> vscanf_s<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span><span class="kw4">restrict</span> format, va_list vlist<span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (4) </td>
<td> <span class="t-mark-rev t-since-c11">(since C11)</span> </td>
</tr>
<tr class="t-dcl t-since-c11">
<td> <div><span class="mw-geshi c source-c"><span class="kw4">int</span> vfscanf_s<span class="br0">(</span> <a href="../io.html"><span class="kw881">FILE</span></a> <span class="sy2">*</span><span class="kw4">restrict</span> stream, <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span><span class="kw4">restrict</span> format,<br />
               va_list vlist<span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (5) </td>
<td> <span class="t-mark-rev t-since-c11">(since C11)</span> </td>
</tr>
<tr class="t-dcl t-since-c11">
<td> <div><span class="mw-geshi c source-c"><span class="kw4">int</span> vsscanf_s<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span><span class="kw4">restrict</span> buffer, <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span><span class="kw4">restrict</span> format,<br />
               va_list vlist<span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (6) </td>
<td> <span class="t-mark-rev t-since-c11">(since C11)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>Reads data from the a variety of sources, interprets it according to <code>format</code> and stores the results into locations defined by <code>vlist</code>.
</p>
<div class="t-li1"><span class="t-li">1)</span> Reads the data from <span class="t-lc"><a href="../io.html" title="c/io">stdin</a></span></div>
<div class="t-li1"><span class="t-li">2)</span> Reads the data from file stream <code>stream</code></div>
<div class="t-li1"><span class="t-li">3)</span> Reads the data from null-terminated character string <code>buffer</code>. Reaching the end of the string is equivalent to reaching the end-of-file condition for <code>fscanf</code></div>
<div class="t-li1"><span class="t-li">4-6)</span> Same as <span class="t-v">(1-3)</span>, except that <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">%</span>c</span></span>, <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">%</span>s</span></span>, and <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">%</span><span class="br0">[</span></span></span> conversion specifiers each expect two arguments (the usual pointer and a value of type <span class="t-lc">rsize_t</span> indicating the size of the receiving array, which may be 1 when reading with a %c into a single char) and except that the following errors are detected at runtime and call the currently installed <a href="../error/set_constraint_handler_s.html" title="c/error/set constraint handler s">constraint handler</a> function:
<dl><dd><ul><li> any of the arguments of pointer type is a null pointer
</li><li> <code>format</code>, <code>stream</code>, or <code>buffer</code> is a null pointer
</li><li> the number of characters that would be written by %c, %s, or %[, plus the terminating null character, would exceed the second (rsize_t) argument provided for each of those conversion specifiers
</li><li> optionally, any other detectable error, such as unknown conversion specifier
</li></ul>
</dd><dd>As all bounds-checked functions, <code>vscanf_s</code>, <code>vfscanf_s</code>, and <code>vsscanf_s</code> are only guaranteed to be available if <span class="t-c"><span class="mw-geshi c source-c">__STDC_LIB_EXT1__</span></span> is defined by the implementation and if the user defines <span class="t-c"><span class="mw-geshi c source-c">__STDC_WANT_LIB_EXT1__</span></span> to the integer constant <span class="t-c"><span class="mw-geshi c source-c"><span class="nu0">1</span></span></span> before including <code><stdio.h></code>.</div>
</dd></dl>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="vfscanf.html#Parameters"><span class="tocnumber">1</span> <span class="toctext">Parameters</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="vfscanf.html#Return_value"><span class="tocnumber">2</span> <span class="toctext">Return value</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="vfscanf.html#Notes"><span class="tocnumber">3</span> <span class="toctext">Notes</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="vfscanf.html#Example"><span class="tocnumber">4</span> <span class="toctext">Example</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="vfscanf.html#References"><span class="tocnumber">5</span> <span class="toctext">References</span></a></li>
<li class="toclevel-1 tocsection-6"><a href="vfscanf.html#See_also"><span class="tocnumber">6</span> <span class="toctext">See also</span></a></li>
</ul>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/io/vfscanf&action=edit&section=1" title="Edit section: Parameters">edit</a>]</span> <span class="mw-headline" id="Parameters">Parameters</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td> stream
</td>
<td> -
</td>
<td> input file stream to read from
</td></tr>
<tr class="t-par">
<td> buffer
</td>
<td> -
</td>
<td> pointer to a null-terminated character string to read from
</td></tr>
<tr class="t-par">
<td> format
</td>
<td> -
</td>
<td> pointer to a null-terminated character string specifying how to read the input.
<p>The format string consists of
</p>
<ul><li> non-whitespace multibyte characters except <code><b>%</b></code>: each such character in the format string consumes exactly one identical character from the input stream, or causes the function to fail if the next character on the stream does not compare equal.
</li><li> whitespace characters: any single whitespace character in the format string consumes all available consecutive whitespace characters from the input (determined as if by calling <a href="../string/byte/isspace.html" title="c/string/byte/isspace"><tt>isspace</tt></a> in a loop). Note that there is no difference between <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">"<span class="es1">\n</span>"</span></span></span>, <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">" "</span></span></span>, <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">"<span class="es1">\t</span><span class="es1">\t</span>"</span></span></span>, or other whitespace in the format string.
</li><li> conversion specifications. Each conversion specification has the following format:
</li></ul>
<dl><dd><ul><li> introductory <code><b>%</b></code> character
</li></ul>
</dd></dl>
<dl><dd><ul><li> <span class="t-mark">(optional)</span> assignment-suppressing character <code><b>*</b></code>. If this option is present, the function does not assign the result of the conversion to any receiving argument.
</li></ul>
</dd></dl>
<dl><dd><ul><li> <span class="t-mark">(optional)</span> integer number (greater than zero) that specifies <i>maximum field width</i>, that is, the maximum number of characters that the function is allowed to consume when doing the conversion specified by the current conversion specification. Note that %s and %[ may lead to buffer overflow if the width is not provided.
</li></ul>
</dd></dl>
<dl><dd><ul><li> <span class="t-mark">(optional)</span> <i>length modifier</i> that specifies the size of the receiving argument, that is, the actual destination type. This affects the conversion accuracy and overflow rules. The default destination type is different for each conversion type (see table below).
</li></ul>
</dd></dl>
<dl><dd><ul><li> conversion format specifier
</li></ul>
</dd></dl>
<p>The following format specifiers are available:
</p>
<table class="wikitable" style="text-align:center; font-size:85%; max-width:90em;">
<tr>
<th rowspan="1"> Conversion<br /> specifier
</th>
<th rowspan="1"> Explanation
</th>
<th colspan="9"> Argument type
</th></tr>
<tr>
<th colspan="2" style="text-align:right; font-weight:normal;"> length modifier
</th>
<th> <code>hh</code>
<p><span class="t-mark-rev t-since-c99">(C99)</span>
</p>
</th>
<th> <code>h</code>
</th>
<th style="font-weight:normal;"> (none)
</th>
<th> <code><b>l</b></code>
</th>
<th> <code><b>ll</b></code>
<p><span class="t-mark-rev t-since-c99">(C99)</span>
</p>
</th>
<th> <code><b>j</b></code>
<p><span class="t-mark-rev t-since-c99">(C99)</span>
</p>
</th>
<th> <code><b>z</b></code>
<p><span class="t-mark-rev t-since-c99">(C99)</span>
</p>
</th>
<th> <code><b>t</b></code>
<p><span class="t-mark-rev t-since-c99">(C99)</span>
</p>
</th>
<th> <code><b>L</b></code>
</th></tr>
<tr>
<th> <code>%</code>
</th>
<td style="text-align:left;"> matches literal <code><b>%</b></code>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td></tr>
<tr>
<th> <code>c</code>
</th>
<td style="text-align:left;">
<dl><dd> matches a <b>character</b> or a sequence of <b>characters</b>
</dd></dl>
<p>If a width specifier is used, matches exactly <i>width</i> characters (the argument must be a pointer to an array with sufficient room). Unlike %s and %[, does not append the null character to the array.
</p>
</td>
<td rowspan="3" style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td rowspan="3" style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td rowspan="3"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">char</span><span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="3"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">wchar_t</span><span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="3" style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td rowspan="3" style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td rowspan="3" style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td rowspan="3" style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td rowspan="3" style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td></tr>
<tr>
<th> <code>s</code>
</th>
<td style="text-align:left;">
<dl><dd> matches a sequence of non-whitespace characters (a <b>string</b>)
</dd></dl>
<p>If width specifier is used, matches up to <i>width</i> or until the first whitespace character, whichever appears first. Always stores a null character in addition to the characters matched (so the argument array must have room for at least <i>width+1</i> characters)
</p>
</td></tr>
<tr>
<th> <code>[</code><span class="t-spar">set</span><code>]</code>
</th>
<td style="text-align:left;">
<dl><dd>matches a non-empty sequence of character from <span class="t-spar">set</span> of characters.
</dd></dl>
<p>If the first character of the set is <code>^</code>, then all characters not in the set are matched. If the set begins with <code>]</code> or <code>^]</code> then the <code>]</code> character is also included into the set. It is implementation-defined whether the character <code>-</code> in the non-initial position in the scanset may be indicating a range, as in <code>[0-9]</code>. If width specifier is used, matches only up to <i>width</i>. Always stores a null character in addition to the characters matched (so the argument array must have room for at least <i>width+1</i> characters)
</p>
</td></tr>
<tr>
<th> <code>d</code>
</th>
<td style="text-align:left;">
<dl><dd>matches a <b>decimal integer</b>.
</dd></dl>
<p>The format of the number is the same as expected by <a href="../string/byte/strtol.html" title="c/string/byte/strtol"><tt>strtol()</tt></a> with the value <span class="t-c"><span class="mw-geshi c source-c"><span class="nu0">10</span></span></span> for the <code>base</code> argument
</p>
</td>
<td rowspan="6"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">signed</span> <span class="kw4">char</span><span class="sy2">*</span></span></span> or <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">unsigned</span> <span class="kw4">char</span><span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="6"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">signed</span> <span class="kw4">short</span><span class="sy2">*</span></span></span> or <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">unsigned</span> <span class="kw4">short</span><span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="6"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">signed</span> <span class="kw4">int</span><span class="sy2">*</span></span></span> or <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">unsigned</span> <span class="kw4">int</span><span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="6"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">signed</span> <span class="kw4">long</span><span class="sy2">*</span></span></span> or <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">unsigned</span> <span class="kw4">long</span><span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="6"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">signed</span> <span class="kw4">long</span> <span class="kw4">long</span><span class="sy2">*</span></span></span> or <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">unsigned</span> <span class="kw4">long</span> <span class="kw4">long</span><span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="6"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi c source-c"><a href="../types/integer.html"><span class="kw118">intmax_t</span></a><span class="sy2">*</span></span></span> or <span class="t-c"><span class="mw-geshi c source-c"><a href="../types/integer.html"><span class="kw132">uintmax_t</span></a><span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="6"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi c source-c"><a href="../types/size_t.html"><span class="kw100">size_t</span></a><span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="6"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi c source-c"><a href="../types/ptrdiff_t.html"><span class="kw101">ptrdiff_t</span></a><span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="6" style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td></tr>
<tr>
<th> <code>i</code>
</th>
<td style="text-align:left;">
<dl><dd>matches an <b>integer</b>.
</dd></dl>
<p>The format of the number is the same as expected by <a href="../string/byte/strtol.html" title="c/string/byte/strtol"><tt>strtol()</tt></a> with the value <span class="t-c"><span class="mw-geshi c source-c"><span class="nu0">0</span></span></span> for the <code>base</code> argument (base is determined by the first characters parsed)
</p>
</td></tr>
<tr>
<th> <code>u</code>
</th>
<td style="text-align:left;">
<dl><dd>matches an unsigned <b>decimal integer</b>.
</dd></dl>
<p>The format of the number is the same as expected by <a href="../string/byte/strtoul.html" title="c/string/byte/strtoul"><tt>strtoul()</tt></a> with the value <span class="t-c"><span class="mw-geshi c source-c"><span class="nu0">10</span></span></span> for the <code>base</code> argument.
</p>
</td></tr>
<tr>
<th> <code>o</code>
</th>
<td style="text-align:left;">
<dl><dd>matches an unsigned <b>octal integer</b>.
</dd></dl>
<p>The format of the number is the same as expected by <a href="../string/byte/strtoul.html" title="c/string/byte/strtoul"><tt>strtoul()</tt></a> with the value <span class="t-c"><span class="mw-geshi c source-c"><span class="nu0">8</span></span></span> for the <code>base</code> argument
</p>
</td></tr>
<tr>
<th> <code>x</code>, <code>X</code>
</th>
<td style="text-align:left;">
<dl><dd>matches an unsigned <b>hexadecimal integer</b>.
</dd></dl>
<p>The format of the number is the same as expected by <a href="../string/byte/strtoul.html" title="c/string/byte/strtoul"><tt>strtoul()</tt></a> with the value <span class="t-c"><span class="mw-geshi c source-c"><span class="nu0">16</span></span></span> for the <code>base</code> argument
</p>
</td></tr>
<tr>
<th> <code>n</code>
</th>
<td style="text-align:left;">
<dl><dd>returns the <b>number of characters read so far</b>.
</dd></dl>
<p>No input is consumed. Does not increment the assignment count. If the specifier has assignment-suppressing operator defined, the behavior is undefined
</p>
</td></tr>
<tr>
<th> <code>a</code>, <code>A</code><span class="t-mark-rev t-since-c99">(C99)</span><br /> <code>e</code>, <code>E</code><br /> <code>f</code>, <code>F</code><br /> <code>g</code>, <code>G</code>
</th>
<td style="text-align:left;">
<dl><dd>matches a <b>floating-point number</b>.
</dd></dl>
<p>The format of the number is the same as expected by <a href="../string/byte/strtof.html" title="c/string/byte/strtof"><tt>strtof()</tt></a>
</p>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">float</span><span class="sy2">*</span></span></span></div></div>
</td>
<td> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">double</span><span class="sy2">*</span></span></span></div></div>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span><span class="sy2">*</span></span></span></div></div>
</td></tr>
<tr>
<th> <code>p</code>
</th>
<td style="text-align:left;">
<dl><dd>matches implementation defined character sequence defining a <b>pointer</b>.
</dd></dl>
<p><code>printf</code> family of functions should produce the same sequence using <code><b>%p</b></code> format specifier
</p>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">void</span><span class="sy2">**</span></span></span></div></div>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td></tr></table>
<p>For every conversion specifier other than <code>n</code>, the longest sequence of input characters which does not exceed any specified field width and which either is exactly what the conversion specifier expects or is a prefix of a sequence it would expect, is what's consumed from the stream. The first character, if any, after this consumed sequence remains unread. If the consumed sequence has length zero or if the consumed sequence cannot be converted as specified above, the matching failure occurs unless end-of-file, an encoding error, or a read error prevented input from the stream, in which case it is an input failure.
</p><p>All conversion specifiers other than <code>[</code>, <code>c</code>, and <code>n</code> consume and discard all leading whitespace characters (determined as if by calling <a href="../string/byte/isspace.html" title="c/string/byte/isspace"><tt>isspace</tt></a>) before attempting to parse the input. These consumed characters do not count towards the specified maximum field width.
</p><p>The conversion specifiers <code>lc</code>, <code>ls</code>, and <code>l[</code> perform multibyte-to-wide character conversion as if by calling <a href="../string/multibyte/mbrtowc.html" title="c/string/multibyte/mbrtowc"><tt>mbrtowc()</tt></a> with an <a href="../string/multibyte/mbstate_t.html" title="c/string/multibyte/mbstate t"><tt>mbstate_t</tt></a> object initialized to zero before the first character is converted.
</p><p>The conversion specifiers <code>s</code> and <code>[</code> always store the null terminator in addition to the matched characters. The size of the destination array must be at least one greater than the specified field width. The use of <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">%</span>s</span></span> or <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">%</span><span class="br0">[</span></span></span>, without specifying the destination array size, is as unsafe as <span class="t-lc"><a href="gets.html" title="c/io/gets">gets</a></span>
</p><p>The correct conversion specifications for the <a href="../types/integer.html" title="c/types/integer">fixed-width integer types</a> (<code>int8_t</code>, etc) are defined in the header <a href="../types/integer.html" title="c/types/integer"><inttypes.h></a> (although <a href="../types/integer.html" title="c/types/integer"><tt>SCNdMAX</tt></a>, <a href="../types/integer.html" title="c/types/integer"><tt>SCNuMAX</tt></a>, etc is synonymous with <code>%jd</code>, <code>%ju</code>, etc).
</p><p>There is a <a href="../language/eval_order.html" title="c/language/eval order">sequence point</a> after the action of each conversion specifier; this permits storing multiple fields in the same "sink" variable.
</p><p>When parsing an incomplete floating-point value that ends in the exponent with no digits, such as parsing <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">"100er"</span></span></span> with the conversion specifier <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">%</span>f</span></span>, the sequence <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">"100e"</span></span></span> (the longest prefix of a possibly valid floating-point number) is consumed, resulting in a matching error (the consumed sequence cannot be converted to a floating-point number), with <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">"r"</span></span></span> remaining. Existing implementations do not follow this rule and roll back to consume only <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">"100"</span></span></span>, leaving <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">"er"</span></span></span>, e.g. <a rel="nofollow" class="external text" href="https://sourceware.org/bugzilla/show_bug.cgi?id=1765">glibc bug 1765</a>
</p><p><br />
</p>
</td></tr>
<tr class="t-par">
<td> vlist
</td>
<td> -
</td>
<td> variable argument list containing the receiving arguments
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/io/vfscanf&action=edit&section=2" title="Edit section: Return value">edit</a>]</span> <span class="mw-headline" id="Return_value">Return value</span></h3>
<div class="t-li1"><span class="t-li">1-3)</span> Number of receiving arguments successfully assigned, or <span class="t-lc"><a href="../io.html" title="c/io">EOF</a></span> if read failure occurs before the first receiving argument was assigned.</div>
<div class="t-li1"><span class="t-li">4-6)</span> Same as <span class="t-v">(1-3)</span>, except that <span class="t-lc"><a href="../io.html" title="c/io">EOF</a></span> is also returned if there is a runtime constraint violation.</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/io/vfscanf&action=edit&section=3" title="Edit section: Notes">edit</a>]</span> <span class="mw-headline" id="Notes">Notes</span></h3>
<p>All these functions invoke <span class="t-lc">va_arg</span> at least once, the value of <code>arg</code> is indeterminate after the return. These functions to not invoke <span class="t-lc">va_end</span>, and it must be done by the caller.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/io/vfscanf&action=edit&section=4" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="co2">#include <stdio.h></span>
<span class="co2">#include <stdbool.h></span>
<span class="co2">#include <stdarg.h></span>
 
bool checked_sscanf<span class="br0">(</span><span class="kw4">int</span> count, <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> buf, <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span>fmt, ...<span class="br0">)</span>
<span class="br0">{</span>
va_list ap<span class="sy4">;</span>
va_start<span class="br0">(</span>ap, fmt<span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">int</span> rc <span class="sy1">=</span> vsscanf<span class="br0">(</span>buf, fmt, ap<span class="br0">)</span><span class="sy4">;</span>
va_end<span class="br0">(</span>ap<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">return</span> rc <span class="sy1">==</span> count<span class="sy4">;</span>
<span class="br0">}</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">int</span> n, m<span class="sy4">;</span>
 
<a href="fprintf.html"><span class="kw848">printf</span></a><span class="br0">(</span><span class="st0">"Parsing '1 2'..."</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span><span class="br0">(</span>checked_sscanf<span class="br0">(</span><span class="nu0">2</span>, <span class="st0">"1 2"</span>, <span class="st0">"%d %d"</span>, <span class="sy3">&</span>n, <span class="sy3">&</span>m<span class="br0">)</span><span class="br0">)</span>
<a href="puts.html"><span class="kw836">puts</span></a><span class="br0">(</span><span class="st0">"success"</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">else</span>
<a href="puts.html"><span class="kw836">puts</span></a><span class="br0">(</span><span class="st0">"failure"</span><span class="br0">)</span><span class="sy4">;</span>
 
<a href="fprintf.html"><span class="kw848">printf</span></a><span class="br0">(</span><span class="st0">"Parsing '1 a'..."</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span><span class="br0">(</span>checked_sscanf<span class="br0">(</span><span class="nu0">2</span>, <span class="st0">"1 a"</span>, <span class="st0">"%d %d"</span>, <span class="sy3">&</span>n, <span class="sy3">&</span>m<span class="br0">)</span><span class="br0">)</span>
<a href="puts.html"><span class="kw836">puts</span></a><span class="br0">(</span><span class="st0">"success"</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">else</span>
<a href="puts.html"><span class="kw836">puts</span></a><span class="br0">(</span><span class="st0">"failure"</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>Output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">Parsing '1 2'...success
Parsing '1 a'...failure</pre></div></div>
</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/io/vfscanf&action=edit&section=5" title="Edit section: References">edit</a>]</span> <span class="mw-headline" id="References">References</span></h3>
<div class="t-ref-std-11">
<ul><li> C11 standard (ISO/IEC 9899:2011):
</li></ul>
<dl><dd><ul><li> 7.21.6.9 The vfscanf function (p: 327)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.21.6.11 The vscanf function (p: 328)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.21.6.14 The vsscanf function (p: 330)
</li></ul>
</dd></dl>
<dl><dd><ul><li> K.3.5.3.9 The vfscanf_s function (p: 597-598)
</li></ul>
</dd></dl>
<dl><dd><ul><li> K.3.5.3.11 The vscanf_s function (p: 599)
</li></ul>
</dd></dl>
<dl><dd><ul><li> K.3.5.3.14 The vsscanf_s function (p: 602)
</li></ul>
</dd></dl>
<div class="t-ref-std-c99">
<ul><li> C99 standard (ISO/IEC 9899:1999):
</li></ul>
<dl><dd><ul><li> 7.19.6.9 The vfscanf function (p: 293)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.19.6.11 The vscanf function (p: 294)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.19.6.14 The vsscanf function (p: 295)
</li></ul>
</dd></dl>
</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/io/vfscanf&action=edit&section=6" title="Edit section: See also">edit</a>]</span> <span class="mw-headline" id="See_also">See also</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="fscanf.html" title="c/io/fscanf"> <span class="t-lines"><span>scanf</span><span>fscanf</span><span>sscanf</span><span>scanf_s</span><span>fscanf_s</span><span>sscanf_s</span></span></a></div><div><span class="t-lines"><span></span><span></span><span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td> reads formatted input from <span class="t-lc"><a href="../io.html" title="c/io">stdin</a></span>, a file stream or a buffer <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:c/io/dsc_fscanf&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vfprintf.html" title="c/io/vfprintf"> <span class="t-lines"><span>vprintf</span><span>vfprintf</span><span>vsprintf</span><span>vsnprintf</span><span>vprintf_s</span><span>vfprintf_s</span><span>vsprintf_s</span><span>vsnprintf_s</span></span></a></div><div><span class="t-lines"><span></span><span></span><span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td> prints formatted output to <span class="t-lc"><a href="../io.html" title="c/io">stdout</a></span>, a file stream or a buffer<br /> using variable argument list <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:c/io/dsc_vfprintf&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td colspan="2"> <div class="t-dsc-see"><span><a href="../../cpp/io/c/vfscanf.html" title="cpp/io/c/vfscanf">C++ documentation</a></span> for <span class="t-dsc-see-tt"><span>vscanf</span>, <span>vfscanf</span>, <span>vsscanf</span></span></div>
</td></tr>
</table></div>
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