1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
/* ************************************************************************ */
/* */
/* Neko Standard Library */
/* Copyright (c)2005 Motion-Twin */
/* */
/* This library is free software; you can redistribute it and/or */
/* modify it under the terms of the GNU Lesser General Public */
/* License as published by the Free Software Foundation; either */
/* version 2.1 of the License, or (at your option) any later version. */
/* */
/* This library 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 */
/* Lesser General Public License or the LICENSE file for more details. */
/* */
/* ************************************************************************ */
#include <neko.h>
#include <time.h>
#include <string.h>
#ifdef NEKO_WINDOWS
# include <windows.h>
# include <process.h>
#else
# include <sys/time.h>
# include <sys/types.h>
# include <unistd.h>
#endif
/**
<doc>
<h1>Random</h1>
<p>A seeded pseudo-random generator</p>
</doc>
**/
DEFINE_KIND(k_random);
#define val_rnd(o) ((rnd*)val_data(o))
#define NSEEDS 25
#define MAX 7
typedef struct _rnd rnd;
struct _rnd {
unsigned long seeds[NSEEDS];
unsigned long cur;
};
static unsigned long mag01[2]={
0x0, 0x8ebfd028 // magic, don't change
};
static const unsigned long init_seeds[] = {
0x95f24dab, 0x0b685215, 0xe76ccae7, 0xaf3ec239, 0x715fad23,
0x24a590ad, 0x69e4b5ef, 0xbf456141, 0x96bc1b7b, 0xa7bdf825,
0xc1de75b7, 0x8858a9c9, 0x2da87693, 0xb657f9dd, 0xffdc8a9f,
0x8121da71, 0x8b823ecb, 0x885d05f5, 0x4e20cd47, 0x5a9ad5d9,
0x512c0c03, 0xea857ccd, 0x4cc1d30f, 0x8891a8a1, 0xa6b7aadb
};
static int rnd_size() {
return sizeof(rnd);
}
static void rnd_set_seed( rnd *r, int s ) {
int i;
r->cur = 0;
memcpy(r->seeds,init_seeds,sizeof(init_seeds));
for(i=0;i<NSEEDS;i++)
r->seeds[i] ^= s;
}
static rnd *rnd_init( void *data ) {
rnd *r = (rnd*)data;
int pid = getpid();
unsigned int time;
#ifdef NEKO_WINDOWS
time = GetTickCount();
#else
struct timeval t;
gettimeofday(&t,NULL);
time = t.tv_sec * 1000000 + t.tv_usec;
#endif
rnd_set_seed(r,time ^ (pid | (pid << 16)));
return r;
}
static unsigned int rnd_int( rnd *r ) {
unsigned int y;
int pos = r->cur++;
if( pos >= NSEEDS ) {
int kk;
for(kk=0;kk<NSEEDS-MAX;kk++)
r->seeds[kk] = r->seeds[kk+MAX] ^ (r->seeds[kk] >> 1) ^ mag01[r->seeds[kk] % 2];
for(;kk<NSEEDS;kk++)
r->seeds[kk] = r->seeds[kk+(MAX-NSEEDS)] ^ (r->seeds[kk] >> 1) ^ mag01[r->seeds[kk] % 2];
r->cur = 1;
pos = 0;
}
y = r->seeds[pos];
y ^= (y << 7) & 0x2b5b2500;
y ^= (y << 15) & 0xdb8b0000;
y ^= (y >> 16);
return y;
}
static double rnd_float( rnd *r ) {
double big = 4294967296.0;
return ((rnd_int(r) / big + rnd_int(r)) / big + rnd_int(r)) / big;
}
/**
random_new : void -> 'random
<doc>Create a new random with random seed</doc>
**/
static value random_new() {
return alloc_abstract( k_random, rnd_init(alloc_private(rnd_size())) );
}
/**
random_set_seed : 'random -> int -> void
<doc>Set the generator seed</doc>
**/
static value random_set_seed( value o, value v ) {
val_check_kind(o,k_random);
val_check(v,int);
rnd_set_seed(val_rnd(o),val_int(v));
return val_true;
}
/**
random_int : 'random -> max:int -> int
<doc>Return a random integer modulo [max]</doc>
**/
static value random_int( value o, value max ) {
val_check_kind(o,k_random);
val_check(max,int);
if( val_int(max) <= 0 )
return alloc_int(0);
return alloc_int( (rnd_int(val_rnd(o)) & 0x3FFFFFFF) % val_int(max) );
}
/**
random_float : 'random -> float
<doc>Return a random float</doc>
**/
static value random_float( value o ) {
val_check_kind(o,k_random);
return alloc_float( rnd_float(val_rnd(o)) );
}
DEFINE_PRIM(random_new,0);
DEFINE_PRIM(random_set_seed,2);
DEFINE_PRIM(random_int,2);
DEFINE_PRIM(random_float,1);
/* ************************************************************************ */
|
