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<h1>Random.cc</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#include &lt;stdio.h&gt;</span>
<a name="l00002"></a>00002 <span class="preprocessor">#include &lt;stdlib.h&gt;</span>
<a name="l00003"></a>00003 <span class="preprocessor">#include &lt;sys/time.h&gt;</span>
<a name="l00004"></a>00004 <span class="preprocessor">#include "Random.h"</span>
<a name="l00005"></a>00005
<a name="l00009"></a>00009 Random::Random(<span class="keywordtype">void</span>)
<a name="l00010"></a>00010 {
<a name="l00011"></a>00011     reset();
<a name="l00012"></a>00012 }
<a name="l00013"></a>00013
<a name="l00017"></a>00017 Random::Random(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> seed)
<a name="l00018"></a>00018 {
<a name="l00019"></a>00019     srandom(seed);
<a name="l00020"></a>00020 }
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="keywordtype">void</span>
<a name="l00023"></a>00023 Random::reset(<span class="keywordtype">void</span>)
<a name="l00024"></a>00024 {
<a name="l00025"></a>00025     FILE *fp;
<a name="l00026"></a>00026     <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> seed;
<a name="l00027"></a>00027     <span class="keyword">struct </span>timeval tv;
<a name="l00028"></a>00028
<a name="l00029"></a>00029     fp = fopen(<span class="stringliteral">"/dev/urandom"</span>, <span class="stringliteral">"r"</span>);
<a name="l00030"></a>00030     <span class="keywordflow">if</span> (!fp) fp = fopen(<span class="stringliteral">"/dev/random"</span>, <span class="stringliteral">"r"</span>);
<a name="l00031"></a>00031
<a name="l00032"></a>00032     <span class="keywordflow">if</span> (fp) {
<a name="l00033"></a>00033         <span class="keywordtype">int</span> res = fread(&amp;seed, <span class="keyword">sizeof</span>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>), 1, fp);
<a name="l00034"></a>00034         <span class="keywordflow">if</span> (res != <span class="keyword">sizeof</span>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)) {
<a name="l00035"></a>00035             fclose(fp);
<a name="l00036"></a>00036             fp = NULL;
<a name="l00037"></a>00037         }
<a name="l00038"></a>00038     }
<a name="l00039"></a>00039
<a name="l00040"></a>00040     <span class="keywordflow">if</span> (!fp) {
<a name="l00041"></a>00041         gettimeofday(&amp;tv, NULL);
<a name="l00042"></a>00042         seed = (tv.tv_sec ^ tv.tv_usec);
<a name="l00043"></a>00043     } <span class="keywordflow">else</span> {
<a name="l00044"></a>00044         fclose(fp);
<a name="l00045"></a>00045     }
<a name="l00046"></a>00046
<a name="l00047"></a>00047     srandom(seed);
<a name="l00048"></a>00048 }
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="keywordtype">int</span>
<a name="l00051"></a>00051 Random::getData(<span class="keywordtype">void</span>)
<a name="l00052"></a>00052 {
<a name="l00053"></a>00053     <span class="keywordflow">return</span> random();
<a name="l00054"></a>00054 }
</pre></div></div>
<hr size="1"><address style="text-align: right;"><small>Generated on Fri Jun 5 18:14:06 2009 for Cerium by&nbsp;
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author	kono@localhost.localdomain
date	Fri, 05 Jun 2009 18:16:31 +0900
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