98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
/**************************************************************************
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* fg_random.c -- routines to handle random number generation
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*
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* Written by Curtis Olson, started July 1997.
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*
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* Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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* (Log is kept at end of this file)
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**************************************************************************/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h> /* for random(), srandom() */
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#include <time.h> /* for time() to seed srandom() */
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#include <Main/fg_debug.h>
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#include "fg_random.h"
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#ifndef HAVE_RAND
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# ifdef sgi
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# undef RAND_MAX
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# define RAND_MAX 2147483647
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# endif
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#endif
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#ifdef __SUNPRO_CC
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extern "C" {
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long int random(void);
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void srandom(unsigned int seed);
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}
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#endif
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/* Seed the random number generater with time() so we don't see the
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* same sequence every time */
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void fg_srandom(void) {
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fgPrintf( FG_MATH, FG_INFO, "Seeding random number generater\n");
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#ifdef HAVE_RAND
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srand(time(NULL));
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#else
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srandom(time(NULL));
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#endif
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}
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/* return a random number between [0.0, 1.0) */
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double fg_random(void) {
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#ifdef HAVE_RAND
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return(rand() / (double)RAND_MAX);
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#else
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return(random() / (double)RAND_MAX);
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#endif
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}
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/* $Log$
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/* Revision 1.5 1998/04/03 22:10:29 curt
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/* Converting to Gnu autoconf system.
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/*
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* Revision 1.4 1998/02/03 23:20:28 curt
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* Lots of little tweaks to fix various consistency problems discovered by
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* Solaris' CC. Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
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* passed arguments along to the real printf(). Also incorporated HUD changes
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* by Michele America.
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*
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* Revision 1.3 1998/01/27 00:47:59 curt
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* Incorporated Paul Bleisch's <bleisch@chromatic.com> new debug message
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* system and commandline/config file processing code.
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*
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* Revision 1.2 1997/12/30 20:47:48 curt
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* Integrated new event manager with subsystem initializations.
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*
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* Revision 1.1 1997/07/30 16:04:09 curt
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* Moved random routines from Utils/ to Math/
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*
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* Revision 1.1 1997/07/19 22:31:57 curt
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* Initial revision.
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*
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*/
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