115 lines
3.3 KiB
C
115 lines
3.3 KiB
C
// 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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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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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 "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 1.10 1998/11/07 19:07:03 curt
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// Enable release builds using the --without-logging option to the configure
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// script. Also a couple log message cleanups, plus some C to C++ comment
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// conversion.
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//
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// Revision 1.9 1998/11/06 21:17:26 curt
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// Converted to new logstream debugging facility. This allows release
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// builds with no messages at all (and no performance impact) by using
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// the -DFG_NDEBUG flag.
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//
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// Revision 1.8 1998/04/25 22:06:23 curt
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// Edited cvs log messages in source files ... bad bad bad!
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//
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// Revision 1.7 1998/04/24 00:43:13 curt
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// Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
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//
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// Revision 1.6 1998/04/18 03:53:42 curt
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// Miscellaneous Tweaks.
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//
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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 <pbleisch@acm.org> 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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