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If <em class="parameter"><code>buffer</code></em> is non-<a
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><code class="literal">NULL</code></a>, <em class="parameter"><code>size</code></em> bytes are copied from it into a new
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buffer. If <em class="parameter"><code>buffer</code></em> is <a
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><code class="literal">NULL</code></a>, a new buffer of size <em class="parameter"><code>size</code></em> is created
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and filled with zero bytes.