bpo-37445: Include FORMAT_MESSAGE_IGNORE_INSERTS in FormatMessageW() …

…calls (pythonGH-14462) If FormatMessageW() is passed the FORMAT_MESSAGE_FROM_SYSTEM flag without FORMAT_MESSAGE_IGNORE_INSERTS, it will fail if there are insert sequences in the message definition. (cherry picked from commit a656365) Co-authored-by: Zackery Spytz <zspytz@gmail.com>
miss-islington · Sep 9, 2019 · 36a8589 · 36a8589
1 parent 5190b71
commit 36a8589
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Showing 4 changed files with 9 additions and 3 deletions.
diff --git a/Misc/NEWS.d/next/Windows/2019-06-28-18-10-29.bpo-37445.LsdYO6.rst b/Misc/NEWS.d/next/Windows/2019-06-28-18-10-29.bpo-37445.LsdYO6.rst
@@ -0,0 +1,2 @@
+Include the ``FORMAT_MESSAGE_IGNORE_INSERTS`` flag in ``FormatMessageW()``
+calls.
diff --git a/Modules/_ctypes/callproc.c b/Modules/_ctypes/callproc.c
@@ -239,7 +239,9 @@ static WCHAR *FormatError(DWORD code)
 {
     WCHAR *lpMsgBuf;
     DWORD n;
-    n = FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
+    n = FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER |
+                       FORMAT_MESSAGE_FROM_SYSTEM |
+                       FORMAT_MESSAGE_IGNORE_INSERTS,
                        NULL,
                        code,
                        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), /* Default language */

diff --git a/Modules/overlapped.c b/Modules/overlapped.c
@@ -486,7 +486,8 @@ overlapped_FormatMessage(PyObject *ignore, PyObject *args)
         return NULL;
 
     n = FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER |
-                       FORMAT_MESSAGE_FROM_SYSTEM,
+                       FORMAT_MESSAGE_FROM_SYSTEM |
+                       FORMAT_MESSAGE_IGNORE_INSERTS,
                        NULL,
                        code,
                        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),

diff --git a/PC/bdist_wininst/install.c b/PC/bdist_wininst/install.c
@@ -939,7 +939,8 @@ static BOOL SystemError(int error, char *msg)
         LPVOID lpMsgBuf;
         FormatMessage(
             FORMAT_MESSAGE_ALLOCATE_BUFFER |
-            FORMAT_MESSAGE_FROM_SYSTEM,
+            FORMAT_MESSAGE_FROM_SYSTEM |
+            FORMAT_MESSAGE_IGNORE_INSERTS,
             NULL,
             error,
             MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),