69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
|
/**************************************************************************
|
||
|
|
* fg_random.c -- routines to handle random number generation
|
||
|
|
*
|
||
|
|
* Written by Curtis Olson, started July 1997.
|
||
|
|
*
|
||
|
|
* Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU General Public License as
|
||
|
|
* published by the Free Software Foundation; either version 2 of the
|
||
|
|
* License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful, but
|
||
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
* General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||
|
|
*
|
||
|
|
* $Id$
|
||
|
|
* (Log is kept at end of this file)
|
||
|
|
**************************************************************************/
|
||
|
|
|
||
|
|
|
||
|
|
#include <stdlib.h> /* for random(), srandom() */
|
||
|
|
#include <time.h> /* for time() to seed srandom() */
|
||
|
|
|
||
|
|
#include "fg_random.h"
|
||
|
|
|
||
|
|
#ifndef USE_RAND
|
||
|
|
# ifdef sgi
|
||
|
|
# undef RAND_MAX
|
||
|
|
# define RAND_MAX 2147483647
|
||
|
|
# endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
/* Seed the random number generater with time() so we don't see the
|
||
|
|
* same sequence every time */
|
||
|
|
void fg_srandom(void) {
|
||
|
|
#ifdef USE_RAND
|
||
|
|
srand(time(NULL));
|
||
|
|
#else
|
||
|
|
srandom(time(NULL));
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* return a random number between [0.0, 1.0) */
|
||
|
|
double fg_random(void) {
|
||
|
|
#ifdef USE_RAND
|
||
|
|
return(rand() / (double)RAND_MAX);
|
||
|
|
#else
|
||
|
|
return(random() / (double)RAND_MAX);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* $Log$
|
||
|
|
/* Revision 1.1 1997/07/30 16:04:09 curt
|
||
|
|
/* Moved random routines from Utils/ to Math/
|
||
|
|
/*
|
||
|
|
* Revision 1.1 1997/07/19 22:31:57 curt
|
||
|
|
* Initial revision.
|
||
|
|
*
|
||
|
|
*/
|