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/* RCSid $Id: random.h,v 2.23 2016/03/06 01:13:17 schorsch 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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#include <stdlib.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if defined(_WIN32) || defined(_WIN64)
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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+.5)))
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#else
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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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extern unsigned short *urperm;
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extern int urmask;
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#define urand(i) (urmask ? (urperm[(i)&urmask]+frandom())/(urmask+1.) \
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: frandom())
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/* defined in urand.c */
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extern long irandom(long modulus);
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extern int initurand(int size);
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extern int ilhash(int *d, int n);
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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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