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<hr><h1>rand_scs.c</h1><div class="fragment"><pre>00001 <font class="comment">/*</font>
00002 <font class="comment"> * Author : Defour David</font>
00003 <font class="comment"> * Contact : David.Defour@ens-lyon.fr</font>
00004 <font class="comment"> *</font>
00005 <font class="comment"> * This program is free software; you can redistribute it and/or modify</font>
00006 <font class="comment"> * it under the terms of the GNU Lesser General Public License as published by</font>
00007 <font class="comment"> * the Free Software Foundation; either version 2 of the License, or </font>
00008 <font class="comment"> * (at your option) any later version.</font>
00009 <font class="comment"> * </font>
00010 <font class="comment"> * This program is distributed in the hope that it will be useful,</font>
00011 <font class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</font>
00012 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</font>
00013 <font class="comment"> * GNU General Public License for more details.</font>
00014 <font class="comment"> *</font>
00015 <font class="comment"> * You should have received a copy of the GNU Lesser General Public License</font>
00016 <font class="comment"> * along with this program; if not, write to the Free Software</font>
00017 <font class="comment"> * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. </font>
00018 <font class="comment"> */</font>
00019 <font class="preprocessor">#include <stdlib.h></font>
00020 <font class="preprocessor">#include "<a class="code" href="scs_8h.html">scs.h</a>"</font>
00021 <font class="preprocessor">#include "<a class="code" href="scs__private_8h.html">scs_private.h</a>"</font>
00022
00023 <font class="comment">/*</font>
00024 <font class="comment"> * Return 'sizeof(int)' random bits </font>
00025 <font class="comment"> */</font>
00026
00027
00028 <font class="keywordtype">int</font> rand_val(<font class="keywordtype">void</font>){
00029 <font class="keywordtype">int</font> val;
00030 <font class="keywordtype">int</font> i;
00031
00032 val = (rand() & 0x000000ff);
00033 <font class="keywordflow">for</font>(i=0; i<(<font class="keyword">sizeof</font>(int)); i++){
00034 val = val << 8;
00035 val += (rand() & 0x000000ff ); <font class="comment">/* we keep only 8 bits */</font>
00036 }
00037 <font class="keywordflow">return</font> val;
00038 }
00039
00040
00041 <font class="comment">/*</font>
00042 <font class="comment"> * Put into 'result' a scs random number with the index field set</font>
00043 <font class="comment"> * with a value between -expo_max and +expo_max.</font>
00044 <font class="comment"> *</font>
00045 <font class="comment"> * Rem. :</font>
00046 <font class="comment"> * 1) If you want an scs number belonging to double precision floating</font>
00047 <font class="comment"> * point number you must call scs_rand with an expo_max less than 39.</font>
00048 <font class="comment"> * 2) expo_max must be less than RAND_MAX that is usually set a</font>
00049 <font class="comment"> * value greater than 32767</font>
00050 <font class="comment"> */</font>
00051 <font class="keywordtype">void</font> scs_rand(<a class="code" href="structscs.html">scs_ptr</a> result, <font class="keywordtype">int</font> expo_max){
00052 <font class="keywordtype">int</font> i;
00053
00054 R_EXP = 1;
00055 R_IND = (rand() % (2*expo_max)) - expo_max;
00056 R_SGN = ((2*rand()- RAND_MAX) > 0) ? (-1) : (1);
00057
00058
00059 <font class="keywordflow">for</font>(i=0; i<SCS_NB_WORDS; i++){
00060 <font class="comment">/* We keep the first SCS_NB_BITS bits of a random value */</font>
00061 R_HW[i] = rand_val() & SCS_MASK_RADIX;
00062 }
00063 }
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