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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2011 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#include "FEATURE/uwin"
#if !_UWIN || _lib_srand48
void _STUB_srand48(){}
#else
#define drand48 ______drand48
#define erand48 ______erand48
#define jrand48 ______jrand48
#define lcong48 ______lcong48
#define lrand48 ______lrand48
#define mrand48 ______mrand48
#define nrand48 ______nrand48
#define seed48 ______seed48
#define srand48 ______srand48
#include <stdlib.h>
#undef drand48
#undef erand48
#undef jrand48
#undef lcong48
#undef lrand48
#undef mrand48
#undef nrand48
#undef seed48
#undef srand48
#if defined(__EXPORT__)
#define extern __EXPORT__
#endif
#define A 0x5DEECE66D
#define A0 0X5
#define A1 0xDEEC
#define A2 0xE66D
#define C 0xB
#define XINIT 0x330E
#define SCALE 3.55271e-15
static unsigned short oldval[3];
static unsigned short X[3] = { 0, 0, XINIT};
static unsigned short a[3] = { A0, A1, A2};
static unsigned short c = C;
static void multadd(unsigned short x[3], unsigned short a[3], unsigned short c)
{
register unsigned long r = c;
unsigned short x2 = x[2];
unsigned short x1 = x[1];
r += a[2]*x2;
x[2] = (unsigned short)r;
r >>= 16;
r += a[1]*x2;
r += a[2]*x1;
x[1] = (unsigned short)r;
r >>= 16;
r += a[2]*x[0];
r += a[1]*x1;
r += a[0]*x2;
x[0] = (unsigned short)r;
}
extern double drand48(void)
{
double d;
unsigned long u;
multadd(X,a,c);
u = (X[0]<<16) + X[1];
d = (u*65536.) + X[2];
return(d*SCALE);
}
extern double erand48(unsigned short xsubi[3])
{
double d;
unsigned long u;
multadd(xsubi,a,c);
u = (xsubi[0]<<16) + xsubi[1];
d = (u*65536.) + xsubi[2];
return(d*SCALE);
}
extern long jrand48(unsigned short xsubi[3])
{
long u;
multadd(xsubi,a,c);
u = (xsubi[0]<<16) | xsubi[1];
return((long)u);
}
extern void lcong48(unsigned short param[7])
{
X[0] = param[0];
X[1] = param[1];
X[2] = param[2];
a[0] = param[3];
a[1] = param[4];
a[2] = param[5];
c = param[6];
}
extern long lrand48(void)
{
long l;
multadd(X,a,c);
l = (X[0]<<15)|(X[1]>>1);
return(l);
}
extern long mrand48(void)
{
unsigned long u;
multadd(X,a,c);
u = (X[0]<<16) | X[1];
return((long)u);
}
extern long nrand48(unsigned short xsubi[3])
{
long l;
multadd(xsubi,a,c);
l = (xsubi[0]<<15)|(xsubi[1]>>1);
return(l);
}
extern unsigned short *seed48(unsigned short seed[3])
{
unsigned short *sp = (unsigned short*)&X;
a[0] = A0;
a[1] = A1;
a[2] = A2;
c = C;
oldval[0] = X[2];
oldval[1] = X[1];
oldval[2] = X[0];
X[0] = seed[2];
X[1] = seed[1];
X[2] = seed[0];
return(oldval);
}
extern void srand48(long seedval)
{
a[0] = A0;
a[1] = A1;
a[2] = A2;
c = C;
X[0] = (unsigned short)(((unsigned long)seedval) >> 16);
X[1] = (unsigned short)seedval;
X[2] = XINIT;
}
#endif
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