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| author | kono@localhost.localdomain |
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| date | Fri, 05 Jun 2009 18:16:31 +0900 |
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| 290:82219f78083a | 291:3569d31705b6 |
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| 1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> | |
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| 3 <title>Cerium: Random.cc Source File</title> | |
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| 20 </div> | |
| 21 <h1>Random.cc</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#include <stdio.h></span> | |
| 22 <a name="l00002"></a>00002 <span class="preprocessor">#include <stdlib.h></span> | |
| 23 <a name="l00003"></a>00003 <span class="preprocessor">#include <sys/time.h></span> | |
| 24 <a name="l00004"></a>00004 <span class="preprocessor">#include "Random.h"</span> | |
| 25 <a name="l00005"></a>00005 | |
| 26 <a name="l00009"></a>00009 Random::Random(<span class="keywordtype">void</span>) | |
| 27 <a name="l00010"></a>00010 { | |
| 28 <a name="l00011"></a>00011 reset(); | |
| 29 <a name="l00012"></a>00012 } | |
| 30 <a name="l00013"></a>00013 | |
| 31 <a name="l00017"></a>00017 Random::Random(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> seed) | |
| 32 <a name="l00018"></a>00018 { | |
| 33 <a name="l00019"></a>00019 srandom(seed); | |
| 34 <a name="l00020"></a>00020 } | |
| 35 <a name="l00021"></a>00021 | |
| 36 <a name="l00022"></a>00022 <span class="keywordtype">void</span> | |
| 37 <a name="l00023"></a>00023 Random::reset(<span class="keywordtype">void</span>) | |
| 38 <a name="l00024"></a>00024 { | |
| 39 <a name="l00025"></a>00025 FILE *fp; | |
| 40 <a name="l00026"></a>00026 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> seed; | |
| 41 <a name="l00027"></a>00027 <span class="keyword">struct </span>timeval tv; | |
| 42 <a name="l00028"></a>00028 | |
| 43 <a name="l00029"></a>00029 fp = fopen(<span class="stringliteral">"/dev/urandom"</span>, <span class="stringliteral">"r"</span>); | |
| 44 <a name="l00030"></a>00030 <span class="keywordflow">if</span> (!fp) fp = fopen(<span class="stringliteral">"/dev/random"</span>, <span class="stringliteral">"r"</span>); | |
| 45 <a name="l00031"></a>00031 | |
| 46 <a name="l00032"></a>00032 <span class="keywordflow">if</span> (fp) { | |
| 47 <a name="l00033"></a>00033 <span class="keywordtype">int</span> res = fread(&seed, <span class="keyword">sizeof</span>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>), 1, fp); | |
| 48 <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>)) { | |
| 49 <a name="l00035"></a>00035 fclose(fp); | |
| 50 <a name="l00036"></a>00036 fp = NULL; | |
| 51 <a name="l00037"></a>00037 } | |
| 52 <a name="l00038"></a>00038 } | |
| 53 <a name="l00039"></a>00039 | |
| 54 <a name="l00040"></a>00040 <span class="keywordflow">if</span> (!fp) { | |
| 55 <a name="l00041"></a>00041 gettimeofday(&tv, NULL); | |
| 56 <a name="l00042"></a>00042 seed = (tv.tv_sec ^ tv.tv_usec); | |
| 57 <a name="l00043"></a>00043 } <span class="keywordflow">else</span> { | |
| 58 <a name="l00044"></a>00044 fclose(fp); | |
| 59 <a name="l00045"></a>00045 } | |
| 60 <a name="l00046"></a>00046 | |
| 61 <a name="l00047"></a>00047 srandom(seed); | |
| 62 <a name="l00048"></a>00048 } | |
| 63 <a name="l00049"></a>00049 | |
| 64 <a name="l00050"></a>00050 <span class="keywordtype">int</span> | |
| 65 <a name="l00051"></a>00051 Random::getData(<span class="keywordtype">void</span>) | |
| 66 <a name="l00052"></a>00052 { | |
| 67 <a name="l00053"></a>00053 <span class="keywordflow">return</span> random(); | |
| 68 <a name="l00054"></a>00054 } | |
| 69 </pre></div></div> | |
| 70 <hr size="1"><address style="text-align: right;"><small>Generated on Fri Jun 5 18:14:06 2009 for Cerium by | |
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