8000 gh-132673: Fix `ctypes.Structure` with `_align_=0` by sobolevn · Pull Request #132676 · python/cpython · GitHub
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gh-132673: Fix ctypes.Structure with _align_=0 #132676

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Merged
merged 3 commits into from
Apr 18, 2025
Merged

gh-132673: Fix ctypes.Structure with _align_=0 #132676

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e9ac834
gh-132673: Fix `ctypes.Structure` with `_align_=0`
sobolevn Apr 18, 2025
d724c46
Update Misc/NEWS.d/next/Library/2025-04-18-14-34-43.gh-issue-132673.0…
sobolevn Apr 18, 2025
2619a90
Add a test case with fields
sobolevn Apr 18, 2025
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Add a test case with fields
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@sobolevn
sobolevn committed Apr 18, 2025
commit 2619a90584384aa1624ebaff7d286aa4b8d5e5af
14 changes: 13 additions & 1 deletion Lib/test/test_ctypes/test_aligned_structures.py
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Expand Up @@ -82,7 +82,7 @@ class MyStructure(base):
_align_ = -1
_fields_ = []

def test_zero_align(self):
def test_zero_align_no_fields(self):
for base in (Structure, LittleEndianStructure, BigEndianStructure):
with self.subTest(base=base):
class MyStructure(base):
Expand All @@ -92,6 +92,18 @@ class MyStructure(base):
self.assertEqual(alignment(MyStructure), 1)
self.assertEqual(alignment(MyStructure()), 1)

def test_zero_align_with_fields(self):
for base in (Structure, LittleEndianStructure, BigEndianStructure):
with self.subTest(base=base):
class MyStructure(base):
_align_ = 0
_fields_ = [
("x", c_ubyte),
]

self.assertEqual(alignment(MyStructure), 1)
self.assertEqual(alignment(MyStructure()), 1)

def test_oversized_structure(self):
data = bytearray(b"\0" * 8)
for base in (LittleEndianStructure, BigEndianStructure):
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