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yap-6.3/library/random/yap_random.c
Vitor Santos Costa 76cfa609c2 listing
2018-11-04 10:55:58 +00:00

77 lines
1.9 KiB
C

/*************************************************************************
* *
* 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 "YapInterface.h"
#include <math.h>
#if defined(__MINGW32__) || _MSC_VER
#include <windows.h>
#endif
X_API void init_random(void);
static short a1 = 27314, b1 = 9213, c1 = 17773;
static YAP_Bool 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 YAP_Bool p_setrand(void) {
a1 = YAP_IntOfTerm(YAP_ARG1);
b1 = YAP_IntOfTerm(YAP_ARG2);
c1 = YAP_IntOfTerm(YAP_ARG3);
return (TRUE);
}
static YAP_Bool 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)));
}
X_API 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 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