| 1 |
< |
/* Copyright (c) 1991 Regents of the University of California */ |
| 1 |
> |
/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
| 2 |
|
|
| 3 |
|
#ifndef lint |
| 4 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
| 4 |
> |
static char SCCSid[] = "$SunId$ SGI"; |
| 5 |
|
#endif |
| 6 |
|
|
| 7 |
|
/* |
| 8 |
< |
* Uncorrelated (anticorrelated) random function |
| 8 |
> |
* Anticorrelated random function due to Christophe Schlick |
| 9 |
|
*/ |
| 10 |
|
|
| 11 |
|
#include "random.h" |
| 12 |
|
|
| 13 |
|
#define NULL 0 |
| 14 |
|
|
| 15 |
+ |
#define MAXORDER (8*sizeof(unsigned short)) |
| 16 |
+ |
|
| 17 |
|
extern char *malloc(); |
| 18 |
|
|
| 19 |
< |
short *urperm; /* urand() permutation */ |
| 19 |
> |
unsigned short *urperm = NULL; /* urand() permutation */ |
| 20 |
|
int urmask; /* bits used in permutation */ |
| 21 |
|
|
| 22 |
|
|
| 23 |
+ |
int |
| 24 |
|
initurand(size) /* initialize urand() for size entries */ |
| 25 |
|
int size; |
| 26 |
|
{ |
| 27 |
|
int order, n; |
| 28 |
|
register int i, offset; |
| 29 |
|
|
| 30 |
+ |
if (urperm != NULL) |
| 31 |
+ |
free((char *)urperm); |
| 32 |
|
size--; |
| 33 |
|
for (i = 1; size >>= 1; i++) |
| 34 |
|
; |
| 35 |
< |
order = i; |
| 35 |
> |
order = i>MAXORDER ? MAXORDER : i; |
| 36 |
|
urmask = (1<<i) - 1; |
| 37 |
< |
urperm = (short *)malloc((urmask+1)*sizeof(short)); |
| 37 |
> |
urperm = (unsigned short *)malloc((urmask+1)*sizeof(unsigned short)); |
| 38 |
|
if (urperm == NULL) { |
| 39 |
|
eputs("out of memory in initurand\n"); |
| 40 |
|
quit(1); |
| 49 |
|
else |
| 50 |
|
urperm[i+offset]++; |
| 51 |
|
} |
| 52 |
+ |
return(1<<order); |
| 53 |
|
} |
| 54 |
|
|
| 55 |
|
|
| 59 |
|
register int n; |
| 60 |
|
{ |
| 61 |
|
static int tab[8] = {13623,353,1637,5831,2314,3887,5832,8737}; |
| 62 |
< |
register unsigned hval; |
| 62 |
> |
register int hval; |
| 63 |
|
|
| 64 |
|
hval = 0; |
| 65 |
|
while (n-- > 0) |
