Backport from upstream version: compatibility with older Python

versions.

Modules/_ctypes/_ctypes.c

@@ -3674,7 +3674,11 @@ CreateArrayType(PyObject *itemtype, Py_ssize_t length)
 		if (cache == NULL)
 			return NULL;
 	}
+#if (PY_VERSION_HEX < 0x02050000)
+	key = Py_BuildValue("(Oi)", itemtype, length);
+#else
 	key = Py_BuildValue("(On)", itemtype, length);
+#endif
 	if (!key)
 		return NULL;
 	result = PyDict_GetItem(cache, key);
@@ -3698,7 +3702,11 @@ CreateArrayType(PyObject *itemtype, Py_ssize_t length)
 #endif
 
 	result = PyObject_CallFunction((PyObject *)&ArrayType_Type,
+#if (PY_VERSION_HEX < 0x02050000)
+				       "s(O){s:i,s:O}",
+#else
 				       "s(O){s:n,s:O}",
+#endif
 				       name,
 				       &Array_Type,
 				       "_length_",

Modules/_ctypes/cfield.c

@@ -250,11 +250,21 @@ CField_repr(CFieldObject *self)
 	name = ((PyTypeObject *)self->proto)->tp_name;
 
 	if (bits)
-		result = PyString_FromFormat("<Field type=%s, ofs=%d:%d, bits=%d>",
-					     name, (int)self->offset, size, bits);
+		result = PyString_FromFormat(
+#if (PY_VERSION_HEX < 0x02050000)
+			"<Field type=%s, ofs=%d:%d, bits=%d>",
+#else
+			"<Field type=%s, ofs=%zd:%d, bits=%d>",
+#endif
+			name, self->offset, size, bits);
 	else
-		result = PyString_FromFormat("<Field type=%s, ofs=%d, size=%d>",
-					     name, (int)self->offset, size);
+		result = PyString_FromFormat(
+#if (PY_VERSION_HEX < 0x02050000)
+			"<Field type=%s, ofs=%d, size=%d>",
+#else
+			"<Field type=%s, ofs=%zd, size=%d>",
+#endif
+			name, self->offset, size);
 	return result;
 }
 

Modules/_ctypes/ctypes.h

 /******************************************************************/
 
+#if (PY_VERSION_HEX < 0x02050000)
+typedef int Py_ssize_t;
+#define lenfunc inquiry
+#define readbufferproc getreadbufferproc
+#define writebufferproc getwritebufferproc
+#define segcountproc getsegcountproc
+#define charbufferproc getcharbufferproc
+#define ssizeargfunc intargfunc
+#define ssizessizeargfunc intintargfunc
+#define ssizeobjargproc intobjargproc
+#define ssizessizeobjargproc intintobjargproc
+#endif
+
 #ifndef MS_WIN32
 #define max(a, b) ((a) > (b) ? (a) : (b))
 #define min(a, b) ((a) < (b) ? (a) : (b))