1 #include	<u.h>
2 #include	<libc.h>
3 
4 #define	MASK	0x7fffffffL
5 
6 long
7 lnrand(long n)
8 {
9 	long slop, v;
10 
11 	if(n < 0)
12 		return n;
13 	slop = MASK % n;
14 	do
15 		v = lrand();
16 	while(v <= slop);
17 	return v % n;
18 }