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/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: random.c *
* Last rev: *
* mods: *
* comments: regular expression interpreter *
* *
*************************************************************************/
#include "config.h"
#include "YapInterface.h"
#include <math.h>
#if defined(__MINGW32__) || _MSC_VER
#include <windows.h>
#endif
void PROTO(init_random, (void));
static short a1 = 27314, b1 = 9213, c1 = 17773;
static int
p_random(void)
{
double fli;
long int t1, t2, t3;
t1 = (a1 * 171) % 30269;
t2 = (b1 * 172) % 30307;
t3 = (c1 * 170) % 30323;
fli = (t1/30269.0) + (t2/30307.0) + (t3/30323.0);
a1 = t1;
b1 = t2;
c1 = t3;
return(YAP_Unify(YAP_ARG1, YAP_MkFloatTerm(fli-(int)(fli))));
}
static int
p_setrand(void)
{
a1 = YAP_IntOfTerm(YAP_ARG1);
b1 = YAP_IntOfTerm(YAP_ARG2);
c1 = YAP_IntOfTerm(YAP_ARG3);
return(TRUE);
}
static int
p_getrand(void)
{
return(YAP_Unify(YAP_ARG1,YAP_MkIntTerm(a1)) &&
YAP_Unify(YAP_ARG2,YAP_MkIntTerm(b1)) &&
YAP_Unify(YAP_ARG3,YAP_MkIntTerm(c1)));
}
void
init_random(void)
{
YAP_UserCPredicate("random", p_random, 1);
YAP_UserCPredicate("setrand", p_setrand, 3);
YAP_UserCPredicate("getrand", p_getrand, 3);
}
#ifdef _WIN32
int WINAPI PROTO(win_random, (HANDLE, DWORD, LPVOID));
int WINAPI win_random(HANDLE hinst, DWORD reason, LPVOID reserved)
{
switch (reason)
{
case DLL_PROCESS_ATTACH:
break;
case DLL_PROCESS_DETACH:
break;
case DLL_THREAD_ATTACH:
break;
case DLL_THREAD_DETACH:
break;
}
return 1;
}
#endif
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