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<tr class="t-nv-h2"><td colspan="5"> Formatted input</td></tr>
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<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="">
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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><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>
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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>
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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>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="rename.html" title="c/io/rename"><span class="t-lines"><span>rename</span></span></a></div></div></td></tr>
<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><strong class="selflink"><span class="t-lines"><span>tmpnam</span><span>tmpnam_s</span></span></strong></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">
<td> <div><span class="mw-geshi c source-c"><span class="kw4">char</span> <span class="sy2">*</span>tmpnam<span class="br0">(</span> <span class="kw4">char</span> <span class="sy2">*</span>filename <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (1) </td>
<td class="t-dcl-nopad"> </td>
</tr>
<tr class="t-dcl t-since-c11">
<td> <div><span class="mw-geshi c source-c">errno_t tmpnam_s<span class="br0">(</span><span class="kw4">char</span> <span class="sy2">*</span>filename_s, rsize_t maxsize<span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (2) </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>
<div class="t-li1"><span class="t-li">1)</span> Creates a unique valid file name (no longer than <span class="t-lc"><a href="../io.html" title="c/io">L_tmpnam</a></span> in length) and stores it in character string pointed to by <code>filename</code>. The function is capable of generating up to <span class="t-lc"><a href="../io.html" title="c/io">TMP_MAX</a></span> of unique filenames, but some or all of them may be in use in the filesystem and thus not suitable return values. </div>
<div class="t-li1"><span class="t-li">2)</span> Same as <span class="t-v">(1)</span>, except that up to <span class="t-lc">TMP_MAX_S</span> names may be generated, no longer than <span class="t-lc">L_tmpnam)s</span> in length, and he 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> <code>filename_s</code> is a null pointer
</li><li> <code>maxsize</code> is greater than <span class="t-c"><span class="mw-geshi c source-c">RSIZE_MAX</span></span>
</li><li> <code>maxsize</code> is less than the generated file name string
</li></ul>
</dd><dd>As all bounds-checked functions, <code>tmpnam_s</code> is only guaranteed to be available of <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>
<p><code>tmpnam</code> and <code>tmpnam_s</code> modify static state (which may be shared between these functions) and are not required to be thread-safe.
</p>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="tmpnam.html#Parameters"><span class="tocnumber">1</span> <span class="toctext">Parameters</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="tmpnam.html#Return_value"><span class="tocnumber">2</span> <span class="toctext">Return value</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="tmpnam.html#Notes"><span class="tocnumber">3</span> <span class="toctext">Notes</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="tmpnam.html#Example"><span class="tocnumber">4</span> <span class="toctext">Example</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="tmpnam.html#References"><span class="tocnumber">5</span> <span class="toctext">References</span></a></li>
<li class="toclevel-1 tocsection-6"><a href="tmpnam.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/tmpnam&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> filename
</td>
<td> -
</td>
<td> pointer to the character array capable of holding at least <span class="t-lc"><a href="../io.html" title="c/io">L_tmpnam</a></span> bytes, to be used as a result buffer. If null pointer is passed, a pointer to an internal static buffer is returned.
</td></tr>
<tr class="t-par">
<td> filename_s
</td>
<td> -
</td>
<td> pointer to the character array capable of holding at least <span class="t-lc">L_tmpnam_s</span> bytes, to be used as a result buffer.
</td></tr>
<tr class="t-par">
<td> maxsize
</td>
<td> -
</td>
<td> maximum number of characters the function is allowed to write (typically the size of the <code>filename_s</code> array).
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/io/tmpnam&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)</span> <code>filename</code> if <code>filename</code> was not a null pointer. Otherwise a pointer to an internal static buffer is returned. If no suitable filename can be generated, null pointer is returned.</div>
<div class="t-li1"><span class="t-li">2)</span> Returns zero and writes the file name to <code>filename_s</code> on success. On error, returns non-zero and writes the null character to <code>filename_s[0]</code> (only if <code>filename_s</code> is not null and <code>maxsize</code> is not zero and is not greater than <span class="t-lc">RSIZE_MAX</span>).</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/io/tmpnam&action=edit&section=3" title="Edit section: Notes">edit</a>]</span> <span class="mw-headline" id="Notes">Notes</span></h3>
<p>Although the names generated by <code>tmpnam</code> are difficult to guess, it is possible that a file with that name is created by another process between the moment <code>tmpnam</code> returns and the moment this program attempts to use the returned name to create a file. The standard function <span class="t-lc"><a href="tmpfile.html" title="c/io/tmpfile">tmpfile</a></span> and the POSIX function <a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/mkdtemp.html">mkstemp</a> do not have this problem (creating a unique directory using only the standard C library still requires the use of <code>tmpnam</code>).
</p><p>POSIX systems additionally define the similarly named function <code><a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/tempnam.html">tempnam()</a></code>, which offers the choice of a directory (which defaults to the optionally defined macro <code><a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/stdio.h.html">P_tmpdir</a>)</code>.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/io/tmpnam&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 <string.h></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">char</span><span class="sy2">*</span> name1 <span class="sy1">=</span> tmpnam<span class="br0">(</span><a href="../types/NULL.html"><span class="kw103">NULL</span></a><span class="br0">)</span><span class="sy4">;</span>
<a href="fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"temporary file name: %s<span class="es1">\n</span>"</span>, name1<span class="br0">)</span><span class="sy4">;</span>
 
<span class="kw4">char</span> name2<span class="br0">[</span><a href="../io.html"><span class="kw899">L_tmpnam</span></a><span class="br0">]</span><span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span>tmpnam<span class="br0">(</span>name2<span class="br0">)</span><span class="br0">)</span>
<a href="fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"temporary file name: %s<span class="es1">\n</span>"</span>, name2<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>Possible output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">temporary file name: /tmp/fileRZHMwL
temporary file name: /tmp/file420gSN</pre></div></div>
</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/io/tmpnam&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> 7.21.4.4 The tmpnam function (p: 303-304)
</li></ul>
</dd></dl>
<dl><dd><ul><li> K.3.5.1.2 The tmpnam_s function (p: 587-588)
</li></ul>
</dd></dl>
<div class="t-ref-std-c99">
<ul><li> C99 standard (ISO/IEC 9899:1999):
</li></ul>
<dl><dd><ul><li> 7.19.4.4 The tmpnam function (p: 269-270)
</li></ul>
</dd></dl>
<div class="t-ref-std-c89">
<ul><li> C89/C90 standard (ISO/IEC 9899:1990):
</li></ul>
<dl><dd><ul><li> 4.9.4.4 The tmpnam function
</li></ul>
</dd></dl>
</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/io/tmpnam&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="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>
<td> returns a pointer to a temporary file <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_tmpfile&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/tmpnam.html" title="cpp/io/c/tmpnam">C++ documentation</a></span> for <span class="t-dsc-see-tt"><span>tmpnam</span></span></div>
</td></tr>
</table></div>
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