From ae06a63be5a1279739e0c8a2006e72f4bc687d57 Mon Sep 17 00:00:00 2001
From: David Majnemer <david.majnemer@gmail.com>
Date: Mon, 7 Oct 2013 09:52:36 +0000
Subject: Windows: Be more explicit with Win32 APIs

This addresses several issues in a similar vein:
 - Use the Unicode APIs when possible, running nm on clang shows that we
   only use Unicode APIs except for FormatMessage, CreateSemaphore, and
   GetModuleHandle.  AFAICT, the latter two are coming from MinGW and
   not LLVM itself.
 - Make getMainExecutable more resilient.  It previously considered
   return values of zero from ::GetModuleFileNameA to be acceptable.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192096 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Support/Windows/Path.inc | 42 ++++++++++++++++++++++++++++++------------
 1 file changed, 30 insertions(+), 12 deletions(-)

(limited to 'lib/Support/Windows/Path.inc')

diff --git a/lib/Support/Windows/Path.inc b/lib/Support/Windows/Path.inc
index 998ec42..0b39198 100644
--- a/lib/Support/Windows/Path.inc
+++ b/lib/Support/Windows/Path.inc
@@ -46,9 +46,9 @@ namespace {
     /*__in*/ LPCWSTR lpTargetFileName,
     /*__in*/ DWORD dwFlags);
 
-  PtrCreateSymbolicLinkW create_symbolic_link_api = PtrCreateSymbolicLinkW(
-    ::GetProcAddress(::GetModuleHandleA("kernel32.dll"),
-                     "CreateSymbolicLinkW"));
+  PtrCreateSymbolicLinkW create_symbolic_link_api =
+      PtrCreateSymbolicLinkW(::GetProcAddress(
+          ::GetModuleHandleW(L"Kernel32.dll"), "CreateSymbolicLinkW"));
 
   error_code TempDir(SmallVectorImpl<wchar_t> &result) {
   retry_temp_dir:
@@ -216,9 +216,28 @@ namespace sys  {
 namespace fs {
 
 std::string getMainExecutable(const char *argv0, void *MainExecAddr) {
-  char pathname[MAX_PATH];
-  DWORD ret = ::GetModuleFileNameA(NULL, pathname, MAX_PATH);
-  return ret != MAX_PATH ? pathname : "";
+  SmallVector<wchar_t, MAX_PATH> PathName;
+  DWORD Size = ::GetModuleFileNameW(NULL, PathName.data(), PathName.capacity());
+
+  // A zero return value indicates a failure other than insufficient space.
+  if (Size == 0)
+    return "";
+
+  // Insufficient space is determined by a return value equal to the size of
+  // the buffer passed in.
+  if (Size == PathName.capacity())
+    return "";
+
+  // On success, GetModuleFileNameW returns the number of characters written to
+  // the buffer not including the NULL terminator.
+  PathName.set_size(Size);
+
+  // Convert the result from UTF-16 to UTF-8.
+  SmallVector<char, MAX_PATH> PathNameUTF8;
+  if (UTF16ToUTF8(PathName.data(), PathName.size(), PathNameUTF8))
+    return "";
+
+  return std::string(PathNameUTF8.data());
 }
 
 UniqueID file_status::getUniqueID() const {
@@ -672,12 +691,11 @@ error_code mapped_file_region::init(int FD, bool CloseFD, uint64_t Offset) {
   case priv:      flprotect = PAGE_WRITECOPY; break;
   }
 
-  FileMappingHandle = ::CreateFileMapping(FileHandle,
-                                          0,
-                                          flprotect,
-                                          (Offset + Size) >> 32,
-                                          (Offset + Size) & 0xffffffff,
-                                          0);
+  FileMappingHandle =
+      ::CreateFileMappingW(FileHandle, 0, flprotect,
+                           (Offset + Size) >> 32,
+                           (Offset + Size) & 0xffffffff,
+                           0);
   if (FileMappingHandle == NULL) {
     error_code ec = windows_error(GetLastError());
     if (FileDescriptor) {
-- 
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