9base/lib9/nrand.c

#include <lib9.h>

extern	long	p9lrand(void);
#define	lrand	p9lrand
#define	MASK	0x7fffffffL

int
nrand(int n)
{
	long slop, v;

	if(n < 0)
		return n;
	slop = MASK % n;
	do
		v = lrand();
	while(v <= slop);
	return v % n;
}