gh-116417: Move 4 limited C API test files to _testlimitedcapi (#116571)

Move the following files from Modules/_testcapi/ to
Modules/_testlimitedcapi/:

* bytearray.c
* bytes.c
* pyos.c
* sys.c

Changes:

* Replace PyBytes_AS_STRING() with PyBytes_AsString().
* Replace PyBytes_GET_SIZE() with PyBytes_Size().
* Update related test_capi tests.
* Copy Modules/_testcapi/util.h to Modules/_testlimitedcapi/util.h.

1 files changed, 33 insertions, 0 deletions

diff --git a/Modules/_testlimitedcapi/util.h b/Modules/_testlimitedcapi/util.h
new file mode 100644
index 0000000..f26d765
--- /dev/null
+++ b/Modules/_testlimitedcapi/util.h
@@ -0,0 +1,33 @@
+#define NULLABLE(x) do {                    \
+        if (x == Py_None) {                 \
+            x = NULL;                       \
+        }                                   \
+    } while (0);
+
+#define RETURN_INT(value) do {              \
+        int _ret = (value);                 \
+        if (_ret == -1) {                   \
+            assert(PyErr_Occurred());       \
+            return NULL;                    \
+        }                                   \
+        assert(!PyErr_Occurred());          \
+        return PyLong_FromLong(_ret);       \
+    } while (0)
+
+#define RETURN_SIZE(value) do {             \
+        Py_ssize_t _ret = (value);          \
+        if (_ret == -1) {                   \
+            assert(PyErr_Occurred());       \
+            return NULL;                    \
+        }                                   \
+        assert(!PyErr_Occurred());          \
+        return PyLong_FromSsize_t(_ret);    \
+    } while (0)
+
+/* Marker to check that pointer value was set. */
+static const char uninitialized[] = "uninitialized";
+#define UNINITIALIZED_PTR ((void *)uninitialized)
+/* Marker to check that Py_ssize_t value was set. */
+#define UNINITIALIZED_SIZE ((Py_ssize_t)236892191)
+/* Marker to check that integer value was set. */
+#define UNINITIALIZED_INT (63256717)