267 lines
12 KiB
HTML
267 lines
12 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<meta name="generator" content="Doxygen 1.8.13"/>
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<title>lwIP: src/include/lwip/mem.h File Reference</title>
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<body>
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<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
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<div id="titlearea">
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<table cellspacing="0" cellpadding="0">
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<tbody>
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<tr style="height: 56px;">
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<td id="projectalign" style="padding-left: 0.5em;">
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<div id="projectname">lwIP
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 <span id="projectnumber">2.1.2</span>
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</div>
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<div id="projectbrief">Lightweight IP stack</div>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<script type="text/javascript">
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$(document).ready(function(){initNavTree('mem_8h.html','');});
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</script>
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<div id="doc-content">
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<!-- window showing the filter options -->
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<div id="MSearchSelectWindow"
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onmouseover="return searchBox.OnSearchSelectShow()"
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onkeydown="return searchBox.OnSearchSelectKey(event)">
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name="MSearchResults" id="MSearchResults">
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</iframe>
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</div>
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<div class="header">
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<div class="summary">
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<a href="#func-members">Functions</a> </div>
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<div class="headertitle">
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<div class="title">mem.h File Reference</div> </div>
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</div><!--header-->
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<div class="contents">
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<div class="textblock"><code>#include "<a class="el" href="opt_8h.html">lwip/opt.h</a>"</code><br />
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</div><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:a44a136e3b70c36abb6f8dc060c778113"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="mem_8h.html#a44a136e3b70c36abb6f8dc060c778113">mem_init</a> (void)</td></tr>
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<tr class="separator:a44a136e3b70c36abb6f8dc060c778113"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a5e39a108c44d8a72df0b30a117cb62e4"><td class="memItemLeft" align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="mem_8h.html#a5e39a108c44d8a72df0b30a117cb62e4">mem_trim</a> (void *<a class="el" href="structmem.html">mem</a>, mem_size_t size)</td></tr>
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<tr class="separator:a5e39a108c44d8a72df0b30a117cb62e4"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a932aa40d85b14cb7331625e012d12335"><td class="memItemLeft" align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="mem_8h.html#a932aa40d85b14cb7331625e012d12335">mem_malloc</a> (mem_size_t size)</td></tr>
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<tr class="separator:a932aa40d85b14cb7331625e012d12335"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ab0bdc525971701883f2065e7fb257a24"><td class="memItemLeft" align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="mem_8h.html#ab0bdc525971701883f2065e7fb257a24">mem_calloc</a> (mem_size_t count, mem_size_t size)</td></tr>
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<tr class="separator:ab0bdc525971701883f2065e7fb257a24"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a2fd7aa1adf6e394d3be7c7734e7df41a"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="mem_8h.html#a2fd7aa1adf6e394d3be7c7734e7df41a">mem_free</a> (void *<a class="el" href="structmem.html">mem</a>)</td></tr>
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<tr class="separator:a2fd7aa1adf6e394d3be7c7734e7df41a"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Heap API </p>
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</div><h2 class="groupheader">Function Documentation</h2>
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<a id="ab0bdc525971701883f2065e7fb257a24"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ab0bdc525971701883f2065e7fb257a24">◆ </a></span>mem_calloc()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">void* mem_calloc </td>
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<td>(</td>
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<td class="paramtype">mem_size_t </td>
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<td class="paramname"><em>count</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">mem_size_t </td>
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<td class="paramname"><em>size</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Contiguously allocates enough space for count objects that are size bytes of memory each and returns a pointer to the allocated memory.</p>
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<p>The allocated memory is filled with bytes of value zero.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">count</td><td>number of objects to allocate </td></tr>
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<tr><td class="paramname">size</td><td>size of the objects to allocate </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>pointer to allocated memory / NULL pointer if there is an error </dd></dl>
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</div>
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</div>
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<a id="a2fd7aa1adf6e394d3be7c7734e7df41a"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a2fd7aa1adf6e394d3be7c7734e7df41a">◆ </a></span>mem_free()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">void mem_free </td>
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<td>(</td>
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<td class="paramtype">void * </td>
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<td class="paramname"><em>rmem</em></td><td>)</td>
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<td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Put a struct mem back on the heap</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">rmem</td><td>is the data portion of a struct mem as returned by a previous call to <a class="el" href="mem_8c.html#af418ade27d91d41e6143dba2cc246b0f">mem_malloc()</a> </td></tr>
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</table>
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</dd>
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</dl>
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</div>
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</div>
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<a id="a44a136e3b70c36abb6f8dc060c778113"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a44a136e3b70c36abb6f8dc060c778113">◆ </a></span>mem_init()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">void mem_init </td>
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<td>(</td>
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<td class="paramtype">void </td>
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<td class="paramname"></td><td>)</td>
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<td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Zero the heap and initialize start, end and lowest-free </p>
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</div>
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</div>
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<a id="a932aa40d85b14cb7331625e012d12335"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a932aa40d85b14cb7331625e012d12335">◆ </a></span>mem_malloc()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">void* mem_malloc </td>
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<td>(</td>
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<td class="paramtype">mem_size_t </td>
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<td class="paramname"><em>size_in</em></td><td>)</td>
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<td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Allocate a block of memory with a minimum of 'size' bytes.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">size_in</td><td>is the minimum size of the requested block in bytes. </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>pointer to allocated memory or NULL if no free memory was found.</dd></dl>
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<p>Note that the returned value will always be aligned (as defined by MEM_ALIGNMENT). </p>
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</div>
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</div>
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<a id="a5e39a108c44d8a72df0b30a117cb62e4"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a5e39a108c44d8a72df0b30a117cb62e4">◆ </a></span>mem_trim()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">void* mem_trim </td>
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<td>(</td>
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<td class="paramtype">void * </td>
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<td class="paramname"><em>rmem</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">mem_size_t </td>
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<td class="paramname"><em>new_size</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Shrink memory returned by <a class="el" href="mem_8c.html#af418ade27d91d41e6143dba2cc246b0f">mem_malloc()</a>.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">rmem</td><td>pointer to memory allocated by mem_malloc the is to be shrinked </td></tr>
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<tr><td class="paramname">new_size</td><td>required size after shrinking (needs to be smaller than or equal to the previous size) </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>for compatibility reasons: is always == rmem, at the moment or NULL if newsize is > old size, in which case rmem is NOT touched or freed! </dd></dl>
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</div>
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</div>
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</div><!-- contents -->
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</div><!-- doc-content -->
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<!-- start footer part -->
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<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
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<ul>
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<li class="navelem"><a class="el" href="dir_68267d1309a1af8e8297ef4c3efbcdba.html">src</a></li><li class="navelem"><a class="el" href="dir_b0856f6b0d80ccb263b2f415c91f9e17.html">include</a></li><li class="navelem"><a class="el" href="dir_4e6b3cf33a61b6caac9c8ac30c866f37.html">lwip</a></li><li class="navelem"><a class="el" href="mem_8h.html">mem.h</a></li>
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<li class="footer">Generated by
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<a href="http://www.doxygen.org/index.html">
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.13 </li>
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</ul>
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