In my example there is an enumeration type that defines four operations. Now each enumeration value is associated with a number, starting from 0. So in the case of these commands we would have a number range from 0 to 3, and we only can generate numbers in this range with equal probability.

  typedef enum  { nop, reset, load, count} command_t;

How to write a function that can count the percentage of the occurrence of each of the numbers which could be used to generate a weight?

If the $urandom_range() function returns a number that has already occurred according to the weight then you just discard it, how to call that function again and use the new (most likely different) number?

Thanks,

Mihaela