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|
| 8 |
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#include "copyright.h" |
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|
| 10 |
< |
#include <stdlib.h> |
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< |
|
| 12 |
< |
#include "standard.h" |
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> |
#include "rterror.h" |
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#include "random.h" |
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|
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#undef initurand |
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|
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#define MAXORDER (8*sizeof(unsigned short)) |
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|
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< |
unsigned short *urperm = NULL; /* urand() permutation */ |
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< |
int urmask; /* bits used in permutation */ |
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> |
static unsigned short empty_tab = 0; |
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|
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+ |
unsigned short *urperm = &empty_tab; /* urand() permutation */ |
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+ |
int urmask = 0; /* bits used in permutation */ |
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+ |
|
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+ |
|
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+ |
long |
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+ |
irandom( /* better than using random() % modulus */ |
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+ |
long modulus |
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) |
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{ |
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+ |
if (sizeof(long) >= 8) |
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+ |
return((random()*modulus)>>31); |
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+ |
|
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+ |
if (sizeof(long long) >= 8) |
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+ |
return((random()*(long long)modulus)>>31); |
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+ |
|
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+ |
return(frandom()*modulus); |
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+ |
} |
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+ |
|
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int |
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< |
initurand(size) /* initialize urand() for size entries */ |
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< |
int size; |
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> |
initurand( /* initialize urand() for size entries */ |
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> |
int size |
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> |
) |
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{ |
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int order, n; |
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< |
register int i, offset; |
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> |
int i, offset; |
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|
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< |
if (urperm != NULL) |
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> |
if ((urperm != NULL) & (urperm != &empty_tab)) |
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free((void *)urperm); |
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if (--size <= 0) { |
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< |
urperm = NULL; |
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> |
empty_tab = 0; |
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> |
urperm = &empty_tab; |
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urmask = 0; |
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return(0); |
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} |
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eputs("out of memory in initurand\n"); |
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quit(1); |
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} |
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< |
urperm[0] = (random() & 0x4000) != 0; |
| 63 |
> |
urperm[0] = 0; |
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|
for (n = 1, offset = 1; n <= order; n++, offset <<= 1) |
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for (i = offset; i--; ) { |
| 66 |
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urperm[i+offset] = urperm[i] <<= 1; |
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|
| 75 |
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|
| 76 |
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int |
| 77 |
< |
ilhash(d, n) /* hash a set of integer values */ |
| 78 |
< |
register int *d; |
| 79 |
< |
register int n; |
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> |
ilhash( /* hash a set of integer values */ |
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> |
int *d, |
| 79 |
> |
int n |
| 80 |
> |
) |
| 81 |
|
{ |
| 82 |
< |
static int tab[8] = {13623,353,1637,5831,2314,3887,5832,8737}; |
| 83 |
< |
register int hval; |
| 82 |
> |
static int tab[8] = {103699,96289,73771,65203,81119,87037,92051,98899}; |
| 83 |
> |
int hval; |
| 84 |
|
|
| 85 |
|
hval = 0; |
| 86 |
|
while (n-- > 0) |
| 87 |
< |
hval += *d++ * tab[n&7]; |
| 88 |
< |
return(hval); |
| 87 |
> |
hval ^= *d++ * tab[n&7]; |
| 88 |
> |
return(hval & 0x7fffffff); |
| 89 |
|
} |
