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/* RCSid $Id: random.h,v 2.13 2003/06/27 06:53:21 greg Exp $ */
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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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#ifndef _RAD_RANDOM_H_
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#define _RAD_RANDOM_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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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 /* ! NORANDOM */
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#ifdef _WIN32
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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./RAND_MAX))
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#else
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#ifdef BSD
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extern long random();
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#define frandom() (random()*(1./2147483648.))
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#else
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extern long lrand48();
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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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#endif
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#ifdef MC
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#define urand(i) frandom()
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#define initurand(n) (n)
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#else /* ! MC */
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extern unsigned short *urperm;
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extern int urmask;
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#define urand(i) ((urperm[(i)&urmask]+frandom())/(urmask+1))
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extern int initurand(int size);
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#endif /* ! MC */
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#endif /* ! NORANDOM */
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/* defined in urand.c */
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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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#ifdef __cplusplus
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}
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#endif
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#endif /* _RAD_RANDOM_H_ */
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