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