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[25/51] [partial] incubator-mynewt-site git commit: generated two
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+
+ <h2 id="os_realloc"><font color="F2853F" style="font-size:24pt">os_realloc</font></h2>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"><span style="color: #A90D91">void</span> <span style="color: #000000">*os_realloc</span>(<span style="color: #A90D91">void</span> <span style="color: #000000">*ptr</span>, <span style="color: #A90D91">size_t</span> <span style="color: #000000">size</span>)
+</pre></div>
+
+
+<p>Tries to resize previously allocated memory block, and returns pointer to resized memory.
+ptr can be NULL, in which case the call is similar to calling <em>os_malloc()</em>.</p>
+<h4 id="arguments">Arguments</h4>
+<table>
+<thead>
+<tr>
+<th>Arguments</th>
+<th>Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>ptr</td>
+<td>Pointer to previously allocated memory</td>
+</tr>
+<tr>
+<td>size</td>
+<td>New size to adjust the memory block to</td>
+</tr>
+</tbody>
+</table>
+<h4 id="returned-values">Returned values</h4>
+<p>NULL: size adjustment was not successful. <br>
+ptr: pointer to new start of memory block</p>
+<h4 id="notes">Notes</h4>
+<h4 id="example">Example</h4>
+<p><Add text to set up the context for the example here></p>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"><span style="color: #000000"><Insert</span> <span style="color: #000000">the</span> <span style="color: #000000">code</span> <span style="color: #000000">snippet</span> <span style="color: #000000">here></span>
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+ <h2 id="os_mbuf_data"><font color="#F2853F" style="font-size:24pt">OS_MBUF_DATA</font></h2>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"><span style="color: #000000">OS_MBUF_DATA</span>(<span style="color: #000000">__om</span>, <span style="color: #000000">__type</span>)
+</pre></div>
+
+
+<p>Macro used to cast the data pointer of an mbuf to a given type.</p>
+<p><br></p>
+<h4 id="arguments">Arguments</h4>
+<table>
+<thead>
+<tr>
+<th>Arguments</th>
+<th>Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>__om</td>
+<td>Pointer to mbuf (struct os_mbuf *)</td>
+</tr>
+<tr>
+<td>__type</td>
+<td>Type to cast</td>
+</tr>
+</tbody>
+</table>
+<p><br></p>
+<h4 id="example">Example</h4>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"> <span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf</span> <span style="color: #000000">*om</span>
+ <span style="color: #A90D91">uint8_t</span> <span style="color: #000000">*rxbuf</span>;
+
+ <span style="color: #000000">rxbuf</span> <span style="color: #000000">=</span> <span style="color: #000000">OS_MBUF_DATA</span>(<span style="color: #000000">om</span>, <span style="color: #A90D91">uint8_t</span> <span style="color: #000000">*</span>);
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+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"><span style="color: #000000">OS_MBUF_LEADINGSPACE</span>(<span style="color: #000000">__om</span>)
+</pre></div>
+
+
+<p>Macro used to get the amount of leading space in an mbuf (in bytes).</p>
+<p><br></p>
+<h4 id="arguments">Arguments</h4>
+<table>
+<thead>
+<tr>
+<th>Arguments</th>
+<th>Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>__om</td>
+<td>Pointer to mbuf (struct os_mbuf *)</td>
+</tr>
+</tbody>
+</table>
+<p><br></p>
+<h4 id="notes">Notes</h4>
+<p>This macro works on both normal mbufs and packet header mbufs. The amount of leading space is the number of bytes between the current om_data pointer of the mbuf and the start of the mbuf user data buffer.</p>
+<p><br></p>
+<h4 id="example">Example</h4>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"> <span style="color: #A90D91">uint8_t</span> <span style="color: #000000">*dptr</span>;
+ <span style="color: #A90D91">uint16_t</span> <span style="color: #000000">space</span>;
+ <span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf</span> <span style="color: #000000">*om</span>;
+ <span style="color: #A90D91">struct</span> <span style="color: #000000">my_data_struct</span> <span style="color: #000000">my_data</span>;
+
+ <span style="color: #177500">/* Copy data from "my_data" into the start of an mbuf but only if there is enough room */</span>
+ <span style="color: #000000">space</span> <span style="color: #000000">=</span> <span style="color: #000000">OS_MBUF_LEADINGSPACE</span>(<span style="color: #000000">om</span>);
+ <span style="color: #A90D91">if</span> (<span style="color: #000000">space</span> <span style="color: #000000">>=</span> <span style="color: #A90D91">sizeof</span>(<span style="color: #A90D91">struct</span> <span style="color: #000000">my_data_struct</span>)) {
+ <span style="color: #000000">dptr</span> <span style="color: #000000">=</span> <span style="color: #000000">om->om_data</span> <span style="color: #000000">-</span> <span style="color: #A90D91">sizeof</span>(<span style="color: #A90D91">struct</span> <span style="color: #000000">my_data_struct</span>);
+ <span style="color: #000000">memcpy</span>(<span style="color: #000000">dptr</span>, <span style="color: #000000">&my_data</span>, <span style="color: #A90D91">sizeof</span>(<span style="color: #A90D91">struct</span> <span style="color: #000000">my_data_struct</span>));
+ }
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+ <h2 id="os_mbuf_pkthdr"><font color="#F2853F" style="font-size:24pt">OS_MBUF_PKTHDR</font></h2>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"><span style="color: #000000">OS_MBUF_PKTHDR</span>(<span style="color: #000000">__om</span>)
+</pre></div>
+
+
+<p>Macro used to get a pointer to the os mbuf packet header of an mbuf.</p>
+<p><br></p>
+<h4 id="arguments">Arguments</h4>
+<table>
+<thead>
+<tr>
+<th>Arguments</th>
+<th>Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>__om</td>
+<td>Pointer to mbuf (struct os_mbuf *)</td>
+</tr>
+</tbody>
+</table>
+<p><br></p>
+<h4 id="example">Example</h4>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"><span style="color: #A90D91">int</span>
+<span style="color: #000000">does_packet_have_data</span>(<span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf</span> <span style="color: #000000">*om</span>)
+{
+ <span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf_pkthdr</span> <span style="color: #000000">*hdr</span>;
+
+ <span style="color: #000000">hdr</span> <span style="color: #000000">=</span> <span style="color: #000000">OS_MBUF_PKTHDR</span>(<span style="color: #000000">om</span>);
+ <span style="color: #A90D91">if</span> (<span style="color: #000000">hdr->omp_len</span> <span style="color: #000000">!=</span> <span style="color: #1C01CE">0</span>) {
+ <span style="color: #177500">/* Packet has data in it */</span>
+ <span style="color: #A90D91">return</span> <span style="color: #000000">TRUE</span>
+ } <span style="color: #A90D91">else</span> {
+ <span style="color: #177500">/* Packet has no data */</span>
+ <span style="color: #A90D91">return</span> <span style="color: #000000">FALSE</span>;
+ }
+}
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