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bpo-47208: Allow vendors to override CTYPES_MAX_ARGCOUNT (GH-32297)

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Christian Heimes 2022-04-04 20:13:42 +03:00 committed by GitHub
parent 1ecfe3d5ae
commit d1b1c885d8
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4 changed files with 6 additions and 3 deletions
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3
Lib/ctypes/test/test_callbacks.py
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@ -4,6 +4,7 @@ from test import support
from ctypes import *
from ctypes.test import need_symbol
from _ctypes import CTYPES_MAX_ARGCOUNT
import _ctypes_test
class Callbacks(unittest.TestCase):
@ -293,8 +294,6 @@ class SampleCallbacksTestCase(unittest.TestCase):
def func(*args):
return len(args)
CTYPES_MAX_ARGCOUNT = 1024
# valid call with nargs <= CTYPES_MAX_ARGCOUNT
proto = CFUNCTYPE(c_int, *(c_int,) * CTYPES_MAX_ARGCOUNT)
cb = proto(func)

1
Misc/NEWS.d/next/Library/2022-04-04-08-54-31.bpo-47208.cOh9xZ.rst Normal file
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@ -0,0 +1 @@
Allow vendors to override :const:`CTYPES_MAX_ARGCOUNT`.

1
Modules/_ctypes/_ctypes.c
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@ -5781,6 +5781,7 @@ _ctypes_add_objects(PyObject *mod)
#endif
MOD_ADD("RTLD_LOCAL", PyLong_FromLong(RTLD_LOCAL));
MOD_ADD("RTLD_GLOBAL", PyLong_FromLong(RTLD_GLOBAL));
MOD_ADD("CTYPES_MAX_ARGCOUNT", PyLong_FromLong(CTYPES_MAX_ARGCOUNT));
MOD_ADD("ArgumentError", Py_NewRef(PyExc_ArgError));
return 0;
#undef MOD_ADD

4
Modules/_ctypes/ctypes.h
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@ -18,7 +18,9 @@
* This limit is enforced for the `alloca()` call in `_ctypes_callproc`,
* to avoid allocating a massive buffer on the stack.
*/
#define CTYPES_MAX_ARGCOUNT 1024
#ifndef CTYPES_MAX_ARGCOUNT
#define CTYPES_MAX_ARGCOUNT 1024
#endif
typedef struct tagPyCArgObject PyCArgObject;
typedef struct tagCDataObject CDataObject;