ref: c5ee3aadd7954e90041dfe7e3ddb3dbcda6d7f2d
dir: /libc/nrand.c/
#include	<u.h>
#include	<libc.h>
#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;
}