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 +1,33 @@
+#!/usr/bin/env python3
+"""Check C89 locals in bytes find and repeat helpers."""
+import sys
+from pathlib import Path
+
+if len(sys.argv) != 2:
+    raise SystemExit("usage: vc6-bytes-core-c89.test.py bytesobject.c")
+source = Path(sys.argv[1]).read_text()
+
+def function_body(signature):
+    start = source.index(signature)
+    body_start = source.index("\n{\n", start) + 2
+    body_end = source.index("\n}\n", body_start)
+    return source[body_start:body_end]
+
+find = function_body("_PyBytes_Find(const char *haystack")
+if not find.lstrip().startswith("Py_ssize_t res;"):
+    raise SystemExit("_PyBytes_Find res must be declared in its entry group")
+if "Py_ssize_t res =" in find:
+    raise SystemExit("_PyBytes_Find res declaration must be separate from assignment")
+if "if (res == -1) {\n        Py_ssize_t last_align;" not in find:
+    raise SystemExit("_PyBytes_Find last_align must be declared at the conditional block entry")
+if not (find.index("res = stringlib_find(") < find.index("if (res == -1)") < find.index("last_align = len_haystack - len_needle;") < find.index("memcmp(haystack + last_align")):
+    raise SystemExit("_PyBytes_Find search and trailing-alignment order changed")
+
+repeat = function_body("_PyBytes_Repeat(char* dest")
+if "else {\n        Py_ssize_t copied;\n        if (src != dest)" not in repeat:
+    raise SystemExit("_PyBytes_Repeat copied must be declared at the else-block entry")
+if "Py_ssize_t copied =" in repeat:
+    raise SystemExit("_PyBytes_Repeat copied declaration must be separate from assignment")
+if not (repeat.index("memcpy(dest, src, len_src);") < repeat.index("copied = len_src;") < repeat.index("while (copied < len_dest)")):
+    raise SystemExit("_PyBytes_Repeat copy loop initialization order changed")
+print("bytes find/repeat C89 declarations and execution order: PASS")