# HG changeset patch
# User Matt Harbison <matt_harbison@yahoo.com>
# Date 1490848380 14400
# Node ID 7c33adc823e008019f0f06ff5f357ca628f3ab34
# Parent  1f3b54f392b0273ad9da180cc45b61917ad68518
win32: work around a WinError problem handling HRESULT types

I ran into this ctypes bug while working with the Crypto API.  While this could
be an issue with any Win32 API in theory, the handful of things that we call are
older functions that are unlikely to return COM errors, so I didn't retrofit
this everywhere.

diff -r 1f3b54f392b0 -r 7c33adc823e0 mercurial/win32.py
--- a/mercurial/win32.py	Wed Jul 12 15:27:56 2017 -0700
+++ b/mercurial/win32.py	Thu Mar 30 00:33:00 2017 -0400
@@ -212,7 +212,12 @@
 _kernel32.PeekNamedPipe.restype = _BOOL
 
 def _raiseoserror(name):
-    err = ctypes.WinError()
+    # Force the code to a signed int to avoid an 'int too large' error.
+    # See https://bugs.python.org/issue28474
+    code = _kernel32.GetLastError()
+    if code > 0x7fffffff:
+        code -= 2**32
+    err = ctypes.WinError(code=code)
     raise OSError(err.errno, '%s: %s' % (name, err.strerror))
 
 def _getfileinfo(name):