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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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/* SCCSid "$SunId$ SGI" */ |
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/* RCSid $Id$ */ |
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/* |
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* random.h - header file for random(3) and urand() function. |
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* |
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* 10/1/85 |
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*/ |
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#include "copyright.h" |
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#ifdef NORANDOM |
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#undef random |
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#define random() 1073741820 |
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#undef srandom |
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#define srandom(s) (s) |
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#define frandom() 0.5 |
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#define urand(i) 0.5 |
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#define initurand(n) (n) |
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#else |
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#ifdef MSDOS |
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#if (RAND_MAX <= 65536) |
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#define random() ((long)rand()<<16^(long)rand()<<6^(long)rand()>>4) |
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#else |
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#define random() rand() |
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#endif |
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#define srandom(s) srand((unsigned)(s)) |
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#define frandom() (rand()*(1./32768.)) |
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#define frandom() (rand()*(1./RAND_MAX)) |
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#else |
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#ifdef BSD |
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extern double drand48(); |
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#define random() lrand48() |
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#define srandom(s) srand48((long)(s)) |
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#define frandom() drand48() |
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#endif |
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#else |
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extern unsigned short *urperm; |
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extern int urmask, initurand(); |
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extern int urmask; |
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#define urand(i) ((urperm[(i)&urmask]+frandom())/(urmask+1)) |
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#endif |
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#endif |
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#ifdef NOPROTO |
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extern int initurand(); |
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extern int ilhash(); |
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extern int urind(); |
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extern void multisamp(); |
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#else |
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/* defined in urand.c */ |
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extern int initurand(int size); |
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extern int ilhash(int *d, int n); |
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/* defined in urind.c */ |
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extern int urind(int s, int i); |
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/* defined in multisamp.c */ |
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extern void multisamp(double t[], int n, double r); |
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#endif |
