1 #include <u.h> 2 #include <libc.h> 3 4 #define MASK 0x7fffffffL 5 6 int 7 nrand(int n) 8 { 9 long slop, v; 10 11 if(n < 0) 12 return n; 13 if(n == 1) 14 return 0; 15 /* and if n == 0, you deserve what you get */ 16 slop = MASK % n; 17 do 18 v = lrand(); 19 while(v <= slop); 20 return v % n; 21 } 22