| 1 |
/* Copyright (c) 1999 Silicon Graphics, Inc. */ |
| 2 |
|
| 3 |
/* SCCSid "$SunId$ SGI" */ |
| 4 |
|
| 5 |
/* |
| 6 |
* random.h - header file for random(3) and urand() function. |
| 7 |
* |
| 8 |
* 10/1/85 |
| 9 |
*/ |
| 10 |
|
| 11 |
#ifdef MSDOS |
| 12 |
|
| 13 |
#define random() ((long)rand()<<16^(long)rand()<<6^(long)rand()>>4) |
| 14 |
#define srandom(s) srand((unsigned)(s)) |
| 15 |
|
| 16 |
#define frandom() (rand()*(1./32768.)) |
| 17 |
|
| 18 |
#else |
| 19 |
#ifdef BSD |
| 20 |
|
| 21 |
extern long random(); |
| 22 |
|
| 23 |
#define frandom() (random()*(1./2147483648.)) |
| 24 |
|
| 25 |
#else |
| 26 |
|
| 27 |
extern long lrand48(); |
| 28 |
extern double drand48(); |
| 29 |
|
| 30 |
#define random() lrand48() |
| 31 |
#define srandom(s) srand48((long)(s)) |
| 32 |
#define frandom() drand48() |
| 33 |
|
| 34 |
#endif |
| 35 |
#endif |
| 36 |
|
| 37 |
#ifdef MC |
| 38 |
|
| 39 |
#define urand(i) frandom() |
| 40 |
#define initurand(n) (n) |
| 41 |
|
| 42 |
#else |
| 43 |
|
| 44 |
extern unsigned short *urperm; |
| 45 |
extern int urmask, initurand(); |
| 46 |
|
| 47 |
#define urand(i) ((urperm[(i)&urmask]+frandom())/(urmask+1)) |
| 48 |
|
| 49 |
#endif |
