1 /**************************************************************************
2 * fg_random.c -- routines to handle random number generation
4 * Written by Curtis Olson, started July 1997.
6 * Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 * (Log is kept at end of this file)
24 **************************************************************************/
32 #include <stdlib.h> /* for random(), srandom() */
33 #include <time.h> /* for time() to seed srandom() */
35 /* #include <Debug/fg_debug.h> */
37 #include "fg_random.h"
42 # define RAND_MAX 2147483647
48 long int random(void);
49 void srandom(unsigned int seed);
54 /* Seed the random number generater with time() so we don't see the
55 * same sequence every time */
56 void fg_srandom(void) {
57 /* fgPrintf( FG_MATH, FG_INFO, "Seeding random number generater\n"); */
67 /* return a random number between [0.0, 1.0) */
68 double fg_random(void) {
70 return(rand() / (double)RAND_MAX);
72 return(random() / (double)RAND_MAX);
78 /* Revision 1.9 1998/11/06 21:17:26 curt
79 /* Converted to new logstream debugging facility. This allows release
80 /* builds with no messages at all (and no performance impact) by using
81 /* the -DFG_NDEBUG flag.
83 * Revision 1.8 1998/04/25 22:06:23 curt
84 * Edited cvs log messages in source files ... bad bad bad!
86 * Revision 1.7 1998/04/24 00:43:13 curt
87 * Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
89 * Revision 1.6 1998/04/18 03:53:42 curt
90 * Miscellaneous Tweaks.
92 * Revision 1.5 1998/04/03 22:10:29 curt
93 * Converting to Gnu autoconf system.
95 * Revision 1.4 1998/02/03 23:20:28 curt
96 * Lots of little tweaks to fix various consistency problems discovered by
97 * Solaris' CC. Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
98 * passed arguments along to the real printf(). Also incorporated HUD changes
101 * Revision 1.3 1998/01/27 00:47:59 curt
102 * Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
103 * system and commandline/config file processing code.
105 * Revision 1.2 1997/12/30 20:47:48 curt
106 * Integrated new event manager with subsystem initializations.
108 * Revision 1.1 1997/07/30 16:04:09 curt
109 * Moved random routines from Utils/ to Math/
111 * Revision 1.1 1997/07/19 22:31:57 curt