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import sys
from test import support
import unittest
from ctypes import *
from ctypes.test import need_symbol
class MemFunctionsTest(unittest.TestCase):
@unittest.skip('test disabled')
def test_overflow(self):
# string_at and wstring_at must use the Python calling
# convention (which acquires the GIL and checks the Python
# error flag). Provoke an error and catch it; see also issue
# #3554: <http://bugs.python.org/issue3554>
self.assertRaises((OverflowError, MemoryError, SystemError),
lambda: wstring_at(u"foo", sys.maxint - 1))
self.assertRaises((OverflowError, MemoryError, SystemError),
lambda: string_at("foo", sys.maxint - 1))
def test_memmove(self):
# large buffers apparently increase the chance that the memory
# is allocated in high address space.
a = create_string_buffer(1000000)
p = b"Hello, World"
result = memmove(a, p, len(p))
self.assertEqual(a.value, b"Hello, World")
self.assertEqual(string_at(result), b"Hello, World")
self.assertEqual(string_at(result, 5), b"Hello")
self.assertEqual(string_at(result, 16), b"Hello, World\0\0\0\0")
self.assertEqual(string_at(result, 0), b"")
def test_memset(self):
a = create_string_buffer(1000000)
result = memset(a, ord('x'), 16)
self.assertEqual(a.value, b"xxxxxxxxxxxxxxxx")
self.assertEqual(string_at(result), b"xxxxxxxxxxxxxxxx")
self.assertEqual(string_at(a), b"xxxxxxxxxxxxxxxx")
self.assertEqual(string_at(a, 20), b"xxxxxxxxxxxxxxxx\0\0\0\0")
def test_cast(self):
a = (c_ubyte * 32)(*map(ord, "abcdef"))
self.assertEqual(cast(a, c_char_p).value, b"abcdef")
self.assertEqual(cast(a, POINTER(c_byte))[:7],
[97, 98, 99, 100, 101, 102, 0])
self.assertEqual(cast(a, POINTER(c_byte))[:7:],
[97, 98, 99, 100, 101, 102, 0])
self.assertEqual(cast(a, POINTER(c_byte))[6:-1:-1],
[0, 102, 101, 100, 99, 98, 97])
self.assertEqual(cast(a, POINTER(c_byte))[:7:2],
[97, 99, 101, 0])
self.assertEqual(cast(a, POINTER(c_byte))[:7:7],
[97])
@support.refcount_test
def test_string_at(self):
s = string_at(b"foo bar")
# XXX The following may be wrong, depending on how Python
# manages string instances
self.assertEqual(2, sys.getrefcount(s))
self.assertTrue(s, "foo bar")
self.assertEqual(string_at(b"foo bar", 7), b"foo bar")
self.assertEqual(string_at(b"foo bar", 3), b"foo")
@need_symbol('create_unicode_buffer')
def test_wstring_at(self):
p = create_unicode_buffer("Hello, World")
a = create_unicode_buffer(1000000)
result = memmove(a, p, len(p) * sizeof(c_wchar))
self.assertEqual(a.value, "Hello, World")
self.assertEqual(wstring_at(a), "Hello, World")
self.assertEqual(wstring_at(a, 5), "Hello")
self.assertEqual(wstring_at(a, 16), "Hello, World\0\0\0\0")
self.assertEqual(wstring_at(a, 0), "")
if __name__ == "__main__":
unittest.main()