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<title>avr-libc: <alloca.h>: Allocate space in the stack</title>
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<h1><alloca.h>: Allocate space in the stack</h1><table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__alloca.html#gabdd78c9d072e9d390bed0e8b79087a85">alloca</a> (size_t __size)</td></tr>
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<hr/><a name="_details"></a><h2>Detailed Description</h2>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="gabdd78c9d072e9d390bed0e8b79087a85"></a><!-- doxytag: member="alloca.h::alloca" ref="gabdd78c9d072e9d390bed0e8b79087a85" args="(size_t __size)" -->
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<td class="memname">void* alloca </td>
<td>(</td>
<td class="paramtype">size_t </td>
<td class="paramname"> <em>__size</em></td>
<td> ) </td>
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<p>Allocate <em>__size</em> bytes of space in the stack frame of the caller. </p>
<p>This temporary space is automatically freed when the function that called <a class="el" href="group__alloca.html#gabdd78c9d072e9d390bed0e8b79087a85" 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#gabdd78c9d072e9d390bed0e8b79087a85" 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"><dt><b>Returns:</b></dt><dd><a class="el" href="group__alloca.html#gabdd78c9d072e9d390bed0e8b79087a85" 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"><dt><b>Warning:</b></dt><dd>Avoid use <a class="el" href="group__alloca.html#gabdd78c9d072e9d390bed0e8b79087a85" 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 1.6.1 on 30 Nov 2009.</center></p>
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