1 files changed, 54 insertions, 0 deletions
diff --git a/libbutl/win32-utility.cxx b/libbutl/win32-utility.cxx
new file mode 100644
index 0000000..c16f8cc
--- /dev/null
+++ b/libbutl/win32-utility.cxx
@@ -0,0 +1,54 @@
+// file      : libbutl/win32-utility.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <libbutl/win32-utility.hxx>
+
+// Note that while we exclude it from the buildfile-based builds, we still
+// need these guards for build2 bootstrap.
+//
+#ifdef _WIN32
+
+#include <memory> // unique_ptr
+
+using namespace std;
+
+namespace butl
+{
+  namespace win32
+  {
+    struct msg_deleter
+    {
+      void operator() (char* p) const {LocalFree (p);}
+    };
+
+    string
+    error_msg (DWORD code)
+    {
+      char* msg;
+      if (!FormatMessageA (
+            FORMAT_MESSAGE_ALLOCATE_BUFFER |
+            FORMAT_MESSAGE_FROM_SYSTEM |
+            FORMAT_MESSAGE_IGNORE_INSERTS |
+            FORMAT_MESSAGE_MAX_WIDTH_MASK,
+            0,
+            code,
+            MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
+            (char*)&msg,
+            0,
+            0))
+        return "unknown error code " + to_string (code);
+
+      unique_ptr<char, msg_deleter> m (msg);
+      return msg;
+    }
+
+    string
+    last_error_msg ()
+    {
+      return error_msg (GetLastError ());
+    }
+  }
+}
+
+#endif // _WIN32