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/*
* Copyright (C)2005-2022 Haxe Foundation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#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,any_int);
rnd_set_seed(val_rnd(o),val_any_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);
/* ************************************************************************ */
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