Command: Memory Difference

[SporyTike]

With the more or less new toolkit version which added AddAddress there is one major problem when coming up with pointers: It's needed to know the differences between memories. I would like to have such a command which works like this:

Input:
!memDiff 0x181320 0x18eb54

Output:
0x181320 - 0x18eb54 = -0xD834