port: advance VC6 compatibility frontier

2026-10-02 17:38:23 +00:00
parent df99608491
commit 01a7105be9
16 changed files with 20324 additions and 5 deletions
@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+"""Check C89 declaration placement in generated bytes Clinic wrappers."""
+import re
+import sys
+from pathlib import Path
+
+if len(sys.argv) != 2:
+    raise SystemExit("usage: vc6-bytes-clinic-c89.test.py bytesobject.c.h")
+source = Path(sys.argv[1]).read_text()
+checks = {
+    "bytes_decode(PyBytesObject *self, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)": (
+        "encoding_length", "errors_length"),
+    "bytes_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)": (
+        "encoding_length", "errors_length"),
+}
+for signature, names in checks.items():
+    start = source.index(signature)
+    body_start = source.index("\n{\n", start) + 2
+    body_end = source.index("\n}", body_start)
+    body = source[body_start:body_end]
+    unpack = re.search(r"^\s*(?:args|fastargs) = _PyArg_UnpackKeywords", body, re.MULTILINE)
+    if unpack is None:
+        raise SystemExit(signature.split("(", 1)[0] + ": argument unpack statement missing")
+    opening = body[:unpack.start()]
+    execution = body[unpack.end():]
+    for name in names:
+        declaration = "Py_ssize_t " + name + ";"
+        if opening.count(declaration) != 1 or body.count(declaration) != 1:
+            raise SystemExit(signature.split("(", 1)[0] + ": " + name + " must be declared once before argument unpacking")
+        if re.search(r"\bPy_ssize_t\s+" + re.escape(name) + r"\b", execution):
+            raise SystemExit(signature.split("(", 1)[0] + ": late declaration remains for " + name)
+    for name in names:
+        if "&" + name not in execution:
+            raise SystemExit(signature.split("(", 1)[0] + ": original UTF-8 length use missing for " + name)
+print("bytes Clinic C89 declaration placement: PASS")