stack_calc.py

from idaapi import *

var_size_threshold   = 16
current_address      = ScreenEA()

for function in Functions(SegStart(current_address), SegEnd(current_address) ):

    stack_frame   = GetFrame( function )

    frame_counter = 0
    prev_count    = -1

    frame_size    = GetStrucSize( stack_frame )

    while frame_counter < frame_size:

        stack_var = GetMemberName( stack_frame, frame_counter )

        if stack_var != "":

            if prev_count != -1:

                distance = frame_counter - prev_distance

                if distance >= var_size_threshold:
                    print "[*] Function: %s -> Stack Variable: %s (%d bytes)" % ( GetFunctionName(function), prev_member, distance )

            else:

                prev_count    = frame_counter
                prev_member   = stack_var

                try:
                    frame_counter = frame_counter + GetMemberSize(stack_frame, frame_counter)
                except:
                    frame_counter += 1
        else:
            frame_counter += 1