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<title>avr-libc: &lt;alloca.h&gt;: Allocate space in the stack</title>
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<td align="left"><a href="http://www.nongnu.org/avr-libc/">AVR Libc Home Page</a></td>
<td align="center" colspan=4><img src="avrs.png" alt="AVRs" align="middle" border="0"></td>
<td align="right"><a href="https://savannah.nongnu.org/projects/avr-libc/">AVR Libc Development Pages</a></td>
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<td align="center" width="13%"><a href="index.html">Main Page</a></td>
<td align="center" width="13%"><a href="pages.html">User Manual</a></td>
<td align="center" width="13%"><a href="modules.html">Library Reference</a></td>
<td align="center" width="13%"><a href="FAQ.html">FAQ</a></td>
<td align="center" width="13%"><a href="globals.html">Alphabetical Index</a></td>
<td align="center" width="13%"><a href="group__demos.html">Example Projects</a></td>
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<h1>&lt;alloca.h&gt;: Allocate space in the stack</h1><hr><a name="_details"></a><h2>Detailed Description</h2>
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<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void *&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__alloca.html#gbdd78c9d072e9d390bed0e8b79087a85">alloca</a> (size_t __size)</td></tr>
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<hr><h2>Function Documentation</h2>
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<td class="memname">void* alloca </td>
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<td class="paramtype">size_t&nbsp;</td>
<td class="paramname"> <em>__size</em> </td>
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Allocate <em>__size</em> bytes of space in the stack frame of the caller.
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This temporary space is automatically freed when the function that called <a class="el" href="group__alloca.html#gbdd78c9d072e9d390bed0e8b79087a85" title="Allocate __size bytes of space in the stack frame of the caller.">alloca()</a> returns to its caller. Avr-libc defines the <a class="el" href="group__alloca.html#gbdd78c9d072e9d390bed0e8b79087a85" title="Allocate __size bytes of space in the stack frame of the caller.">alloca()</a> as a macro, which is translated into the inlined <code>__builtin_alloca()</code> function. The fact that the code is inlined, means that it is impossible to take the address of this function, or to change its behaviour by linking with a different library.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd><a class="el" href="group__alloca.html#gbdd78c9d072e9d390bed0e8b79087a85" title="Allocate __size bytes of space in the stack frame of the caller.">alloca()</a> returns a pointer to the beginning of the allocated space. If the allocation causes stack overflow, program behaviour is undefined.</dd></dl>
<dl class="warning" compact><dt><b>Warning:</b></dt><dd>Avoid use <a class="el" href="group__alloca.html#gbdd78c9d072e9d390bed0e8b79087a85" title="Allocate __size bytes of space in the stack frame of the caller.">alloca()</a> inside the list of arguments of a function call. </dd></dl>
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<p><center>Automatically generated by Doxygen 1.5.6 on 4 Dec 2008.</center></p>
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