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<p>Extensions to the C Library Part II: Dynamic Allocation Functions, ISO/IEC TR 24731-2:2010, defines the following new components for the C standard library:
</p>
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<td> <div class="t-dsc-member-div"><div><span class="t-lines"><span>__STDC_ALLOC_LIB__</span></span></div></div>
</td>
<td> integer constant of type <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span></span></span> indicating conformance level <br /> <span class="t-mark">(macro constant)</span>
</td></tr>
<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><stdio.h></code> </div>
</td></tr>
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<td> <div class="t-dsc-member-div"><div><a href="http://en.cppreference.com/mwiki/index.php?title=c/experimental/dynamic/fmemopen&action=edit&redlink=1" class="new" title="c/experimental/dynamic/fmemopen (page does not exist)"> <span class="t-lines"><span>fmemopen</span></span></a></div></div>
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<td> opens a fixed-size memory buffer as an I/O stream <br /> <span class="t-mark">(function)</span>
</td></tr>
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<td> <div class="t-dsc-member-div"><div><a href="http://en.cppreference.com/mwiki/index.php?title=c/experimental/dynamic/open_memstream&action=edit&redlink=1" class="new" title="c/experimental/dynamic/open memstream (page does not exist)"> <span class="t-lines"><span>open_memstream</span><span>open_wmemstream</span></span></a></div></div>
</td>
<td> opens a dynamically resized memory buffer as an I/O stream <br /> <span class="t-mark">(function)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="http://en.cppreference.com/mwiki/index.php?title=c/experimental/dynamic/asprintf&action=edit&redlink=1" class="new" title="c/experimental/dynamic/asprintf (page does not exist)"> <span class="t-lines"><span>asprintf</span><span>aswprintf</span><span>vasprintf</span><span>vaswprintf</span></span></a></div></div>
</td>
<td> variants of <span class="t-lc"><a href="../io/fprintf.html" title="c/io/fprintf">sprintf</a></span> etc that write to automatically-allocated buffer and return a pointer to it <br /> <span class="t-mark">(function)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="http://en.cppreference.com/mwiki/index.php?title=c/experimental/dynamic/getdelim&action=edit&redlink=1" class="new" title="c/experimental/dynamic/getdelim (page does not exist)"> <span class="t-lines"><span>getdelim</span><span>getwdelim</span></span></a></div></div>
</td>
<td> read from a stream into a dynamically-allocated buffer until the delimiter <br /> <span class="t-mark">(function)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="http://en.cppreference.com/mwiki/index.php?title=c/experimental/dynamic/getline&action=edit&redlink=1" class="new" title="c/experimental/dynamic/getline (page does not exist)"> <span class="t-lines"><span>getline</span><span>getwline</span></span></a></div></div>
</td>
<td> read from a stream into a dynamically-allocated buffer until end of line <br /> <span class="t-mark">(function)</span>
</td></tr>
<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><string.h></code> </div>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="http://en.cppreference.com/mwiki/index.php?title=c/experimental/dynamic/strdup&action=edit&redlink=1" class="new" title="c/experimental/dynamic/strdup (page does not exist)"> <span class="t-lines"><span>strdup</span></span></a></div></div>
</td>
<td> allocate a copy of a string <br /> <span class="t-mark">(function)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="http://en.cppreference.com/mwiki/index.php?title=c/experimental/dynamic/strndup&action=edit&redlink=1" class="new" title="c/experimental/dynamic/strndup (page does not exist)"> <span class="t-lines"><span>strndup</span></span></a></div></div>
</td>
<td> allocate a copy of a string up to specified size <br /> <span class="t-mark">(function)</span>
</td></tr>
</table>
<p>This library extension also introduces assignment-allocation character <code><b>m</b></code> for use with <code><b>%s</b></code>, <code><b>%[</b></code>, and <code><b>%c</b></code> conversion specifiers in <span class="t-lc"><a href="../io/fscanf.html" title="c/io/fscanf">fscanf</a></span> and <span class="t-lc"><a href="../io/fwscanf.html" title="c/io/fwscanf">fwscanf</a></span> family of functions.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/experimental/dynamic&action=edit&section=1" title="Edit section: Notes">edit</a>]</span> <span class="mw-headline" id="Notes">Notes</span></h3>
<p>The functions <code>fmemopen</code>, <code>open_memstream</code>, <code>open_wmemstream</code>, <code>getdelim</code>, <code>getline</code>, <code>strdup</code>, <code>strndup</code>, and the extensions to <code>fscanf</code> are available in <a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/">POSIX (ISO/IEC 9945:2003)</a>.
</p><p>The functions <code>asprintf</code> and <code>vasprintf</code> are available in Linux Standard Base (ISO/IEC IS 23360:2006)
</p>
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