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Diffstat (limited to 'src/lib/libast/uwin/rand48.c')
| -rw-r--r-- | src/lib/libast/uwin/rand48.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/src/lib/libast/uwin/rand48.c b/src/lib/libast/uwin/rand48.c new file mode 100644 index 0000000..184a3b7 --- /dev/null +++ b/src/lib/libast/uwin/rand48.c @@ -0,0 +1,177 @@ +/*********************************************************************** +* * +* 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 |