port: advance MSVC600 CPython compatibility frontier

2026-08-22 17:36:38 +00:00
parent a7a9560e5c
commit 824b4f0d24
15 changed files with 6150 additions and 41 deletions
@@ -0,0 +1,84 @@
+#ifndef PYWIN9X_COMPAT_MSVC600_PATHCCH_H
+#define PYWIN9X_COMPAT_MSVC600_PATHCCH_H
+
+/*
+ * Narrow PathCchFindExtension compatibility for the VC6/MSVC600 probe.
+ *
+ * CPython 3.11's Modules/getpath.c includes <pathcch.h> only to call
+ * PathCchFindExtension() from getpath_isxfile().  MSVC 6.0's Windows SDK
+ * predates PathCch, so provide just that one API shape for the project-local
+ * VC6 include path.  Modern builds should keep using the platform SDK header;
+ * this file is not installed into CPython or a system include directory.
+ */
+
+#if defined(_MSC_VER) && _MSC_VER <= 1200
+
+#ifndef _WINDOWS_
+#include <windows.h>
+#endif
+#include <stddef.h>
+
+#ifndef PCWSTR
+typedef const WCHAR *PCWSTR;
+#endif
+#ifndef PWSTR
+typedef WCHAR *PWSTR;
+#endif
+#ifndef S_OK
+#define S_OK ((HRESULT)0L)
+#endif
+#ifndef E_INVALIDARG
+#define E_INVALIDARG ((HRESULT)0x80070057L)
+#endif
+
+static HRESULT
+PathCchFindExtension(PCWSTR pszPath, size_t cchPath, PCWSTR *ppszExt)
+{
+    size_t i;
+    size_t last_sep;
+    size_t last_dot;
+    int have_dot;
+
+    if (pszPath == NULL || ppszExt == NULL || cchPath == 0) {
+        return E_INVALIDARG;
+    }
+
+    last_sep = 0;
+    last_dot = 0;
+    have_dot = 0;
+
+    for (i = 0; i < cchPath; ++i) {
+        WCHAR ch = pszPath[i];
+        if (ch == L'\0') {
+            if (have_dot) {
+                *ppszExt = pszPath + last_dot;
+            }
+            else {
+                *ppszExt = pszPath + i;
+            }
+            return S_OK;
+        }
+        if (ch == L'\\' || ch == L'/' || ch == L':') {
+            last_sep = i + 1;
+            have_dot = 0;
+        }
+        else if (ch == L'.' && i >= last_sep) {
+            last_dot = i;
+            have_dot = 1;
+        }
+    }
+
+    *ppszExt = NULL;
+    return E_INVALIDARG;
+}
+
+#else
+/*
+ * This compatibility header is intentionally scoped to VC6.  If a modern
+ * compiler finds it, the include path is wrong: use the real Windows SDK
+ * pathcch.h instead to avoid shadowing the platform declaration.
+ */
+#error "compat/msvc600/pathcch.h is only for MSVC 6.0; use the Windows SDK pathcch.h on modern compilers"
+#endif
+
+#endif /* PYWIN9X_COMPAT_MSVC600_PATHCCH_H */