A function which returns all the strings referenced from function

ida_sarlk_function_strings_ref.py

def strs(f=None, visited=None, level=0, maxlevel=-1):
    if maxlevel >= 0 and level > maxlevel:
        return [], set()
    if not f:
        f = sark.Function()
    if not visited:
        visited = set()
        root = True
    else:
       root = False
    print 'f: ' + f.name
    visited.add(f)
    ret = []
    
    for ln in f.lines:
        for x in ln.xrefs_from:
            if x.iscode:
                to = sark.Function(x.to)
                if to in visited:
                    continue
                ret_str, ret_set = strs(to, visited, level+1, maxlevel)
                ret.extend(ret_str)
                visited = visited.union(ret_set)
            else:
                l = sark.Line(x.to)
                print 'x:  ' + repr(l)
                if l.type != 'string':
                    continue
                ret.append(l.bytes)
    if root:
        return sorted(list(set(ret)))
    return ret, visited