import ctypes
import os
if hasattr(ctypes.cdll, "msvcrt"): #windows branch
_BUF = ctypes.create_string_buffer('a')
def _check(address):
try:
ctypes.cdll.msvcrt.memcpy(_BUF, address, 1)
return True
except WindowsError:
return False
else:
libc = ctypes.CDLL('libc.so.6')
libc.write.argtypes = ctypes.c_int, ctypes.c_void_p, ctypes.c_size_t
_BUF = open('/tmp/_buf', 'w')
_FD = _BUF.fileno()
os.unlink(_BUF)
def _check(address):
rc = libc.write(_FD, address, 1)
_BUF.seek(0)
return rc == 1
def is_valid_ptr(address):
'determines if the passed address (integer) is a valid pointer'
return _check(address)
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