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lightning-sunbird  0.9+nobinonly
prng.c
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00001 /*
00002  *  prng.c
00003  *
00004  *  Command-line pseudo-random number generator
00005  *
00006  * ***** BEGIN LICENSE BLOCK *****
00007  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00008  *
00009  * The contents of this file are subject to the Mozilla Public License Version
00010  * 1.1 (the "License"); you may not use this file except in compliance with
00011  * the License. You may obtain a copy of the License at
00012  * http://www.mozilla.org/MPL/
00013  *
00014  * Software distributed under the License is distributed on an "AS IS" basis,
00015  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00016  * for the specific language governing rights and limitations under the
00017  * License.
00018  *
00019  * The Original Code is the MPI Arbitrary Precision Integer Arithmetic library.
00020  *
00021  * The Initial Developer of the Original Code is
00022  * Michael J. Fromberger.
00023  * Portions created by the Initial Developer are Copyright (C) 1998
00024  * the Initial Developer. All Rights Reserved.
00025  *
00026  * Contributor(s):
00027  *
00028  * Alternatively, the contents of this file may be used under the terms of
00029  * either the GNU General Public License Version 2 or later (the "GPL"), or
00030  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00031  * in which case the provisions of the GPL or the LGPL are applicable instead
00032  * of those above. If you wish to allow use of your version of this file only
00033  * under the terms of either the GPL or the LGPL, and not to allow others to
00034  * use your version of this file under the terms of the MPL, indicate your
00035  * decision by deleting the provisions above and replace them with the notice
00036  * and other provisions required by the GPL or the LGPL. If you do not delete
00037  * the provisions above, a recipient may use your version of this file under
00038  * the terms of any one of the MPL, the GPL or the LGPL.
00039  *
00040  * ***** END LICENSE BLOCK ***** */
00041 /* $Id: prng.c,v 1.4 2004/04/27 23:04:37 gerv%gerv.net Exp $ */
00042 
00043 #include <stdio.h>
00044 #include <stdlib.h>
00045 #include <limits.h>
00046 #include <time.h>
00047 
00048 #ifdef __OS2__
00049 #include <types.h>
00050 #include <process.h>
00051 #else
00052 #include <unistd.h>
00053 #endif
00054 
00055 #include "bbs_rand.h"
00056 
00057 int main(int argc, char *argv[])
00058 {
00059   unsigned char *seed;
00060   unsigned int   ix, num = 1;
00061   pid_t          pid;
00062   
00063   if(argc > 1) {
00064     num = atoi(argv[1]);
00065     if(num <= 0) 
00066       num = 1;
00067   }
00068 
00069   pid = getpid();
00070   srand(time(NULL) * (unsigned int)pid);
00071 
00072   /* Not a perfect seed, but not bad */
00073   seed = malloc(bbs_seed_size);
00074   for(ix = 0; ix < bbs_seed_size; ix++) {
00075     seed[ix] = rand() % UCHAR_MAX;
00076   }
00077 
00078   bbs_srand(seed, bbs_seed_size);
00079   memset(seed, 0, bbs_seed_size);
00080   free(seed);
00081 
00082   while(num-- > 0) {
00083     ix = bbs_rand();
00084 
00085     printf("%u\n", ix);
00086   }
00087 
00088   return 0;
00089 
00090 }