1import sys
2import unittest
3from ctypes import *
4from ctypes.test import need_symbol
5
6class MemFunctionsTest(unittest.TestCase):
7    @unittest.skip('test disabled')
8    def test_overflow(self):
9        # string_at and wstring_at must use the Python calling
10        # convention (which acquires the GIL and checks the Python
11        # error flag).  Provoke an error and catch it; see also issue
12        # #3554: <http://bugs.python.org/issue3554>
13        self.assertRaises((OverflowError, MemoryError, SystemError),
14                          lambda: wstring_at(u"foo", sys.maxint - 1))
15        self.assertRaises((OverflowError, MemoryError, SystemError),
16                          lambda: string_at("foo", sys.maxint - 1))
17
18    def test_memmove(self):
19        # large buffers apparently increase the chance that the memory
20        # is allocated in high address space.
21        a = create_string_buffer(1000000)
22        p = "Hello, World"
23        result = memmove(a, p, len(p))
24        self.assertEqual(a.value, "Hello, World")
25
26        self.assertEqual(string_at(result), "Hello, World")
27        self.assertEqual(string_at(result, 5), "Hello")
28        self.assertEqual(string_at(result, 16), "Hello, World\0\0\0\0")
29        self.assertEqual(string_at(result, 0), "")
30
31    def test_memset(self):
32        a = create_string_buffer(1000000)
33        result = memset(a, ord('x'), 16)
34        self.assertEqual(a.value, "xxxxxxxxxxxxxxxx")
35
36        self.assertEqual(string_at(result), "xxxxxxxxxxxxxxxx")
37        self.assertEqual(string_at(a), "xxxxxxxxxxxxxxxx")
38        self.assertEqual(string_at(a, 20), "xxxxxxxxxxxxxxxx\0\0\0\0")
39
40    def test_cast(self):
41        a = (c_ubyte * 32)(*map(ord, "abcdef"))
42        self.assertEqual(cast(a, c_char_p).value, "abcdef")
43        self.assertEqual(cast(a, POINTER(c_byte))[:7],
44                             [97, 98, 99, 100, 101, 102, 0])
45        self.assertEqual(cast(a, POINTER(c_byte))[:7:],
46                             [97, 98, 99, 100, 101, 102, 0])
47        self.assertEqual(cast(a, POINTER(c_byte))[6:-1:-1],
48                             [0, 102, 101, 100, 99, 98, 97])
49        self.assertEqual(cast(a, POINTER(c_byte))[:7:2],
50                             [97, 99, 101, 0])
51        self.assertEqual(cast(a, POINTER(c_byte))[:7:7],
52                             [97])
53
54    def test_string_at(self):
55        s = string_at("foo bar")
56        # XXX The following may be wrong, depending on how Python
57        # manages string instances
58        self.assertEqual(2, sys.getrefcount(s))
59        self.assertTrue(s, "foo bar")
60
61        self.assertEqual(string_at("foo bar", 8), "foo bar\0")
62        self.assertEqual(string_at("foo bar", 3), "foo")
63
64    @need_symbol('create_unicode_buffer')
65    def test_wstring_at(self):
66        p = create_unicode_buffer("Hello, World")
67        a = create_unicode_buffer(1000000)
68        result = memmove(a, p, len(p) * sizeof(c_wchar))
69        self.assertEqual(a.value, "Hello, World")
70
71        self.assertEqual(wstring_at(a), "Hello, World")
72        self.assertEqual(wstring_at(a, 5), "Hello")
73        self.assertEqual(wstring_at(a, 16), "Hello, World\0\0\0\0")
74        self.assertEqual(wstring_at(a, 0), "")
75
76if __name__ == "__main__":
77    unittest.main()
78