import gdb.printing
import re

class StdStringPrinter:

	def __init__ (self, val):
		self.val = val

	def to_string (self):
		return self.val['_M_dataplus']['_M_p']

	def display_hint (self):
		return 'string'

def str_lookup_function(val):
	bbb = {}
	try:
		bbb = val.type.fields ()
	except:
		pass
	found = 0
	for x in bbb:
		if x.name == '_M_dataplus':
			found = 1
	if found == 1:
		return StdStringPrinter(val)
	return None

gdb.printing.register_pretty_printer (gdb, str_lookup_function)