1 files changed, 62 insertions, 0 deletions
diff --git a/boost/dll/detail/windows/path_from_handle.hpp b/boost/dll/detail/windows/path_from_handle.hpp
new file mode 100644
index 0000000000..37eee86428
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+++ b/boost/dll/detail/windows/path_from_handle.hpp
@@ -0,0 +1,62 @@
+// Copyright 2014 Renato Tegon Forti, Antony Polukhin.
+// Copyright 2015 Antony Polukhin.
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt
+// or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_DLL_DETAIL_WINDOWS_PATH_FROM_HANDLE_HPP
+#define BOOST_DLL_DETAIL_WINDOWS_PATH_FROM_HANDLE_HPP
+
+#include <boost/config.hpp>
+#include <boost/dll/detail/system_error.hpp>
+#include <boost/detail/winapi/dll.hpp>
+#include <boost/detail/winapi/get_last_error.hpp>
+#include <boost/filesystem/path.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+# pragma once
+#endif
+
+namespace boost { namespace dll { namespace detail {
+
+    static inline boost::system::error_code last_error_code() BOOST_NOEXCEPT {
+        boost::detail::winapi::DWORD_ err = boost::detail::winapi::GetLastError();
+        return boost::system::error_code(
+            err,
+            boost::system::system_category()
+        );
+    }
+
+    inline boost::filesystem::path path_from_handle(boost::detail::winapi::HMODULE_ handle, boost::system::error_code &ec) {
+        BOOST_STATIC_CONSTANT(boost::detail::winapi::DWORD_, ERROR_INSUFFICIENT_BUFFER_ = 0x7A);
+        BOOST_STATIC_CONSTANT(boost::detail::winapi::DWORD_, DEFAULT_PATH_SIZE_ = 260);
+
+        // If `handle` parameter is NULL, GetModuleFileName retrieves the path of the
+        // executable file of the current process.
+        boost::detail::winapi::WCHAR_ path_hldr[DEFAULT_PATH_SIZE_];
+        boost::detail::winapi::GetModuleFileNameW(handle, path_hldr, DEFAULT_PATH_SIZE_);
+        ec = last_error_code();
+        if (!ec) {
+            return boost::filesystem::path(path_hldr);
+        }
+
+        for (unsigned i = 2; i < 1025 && static_cast<boost::detail::winapi::DWORD_>(ec.value()) == ERROR_INSUFFICIENT_BUFFER_; i *= 2) {
+            std::wstring p(DEFAULT_PATH_SIZE_ * i, L'\0');
+            const std::size_t size = boost::detail::winapi::GetModuleFileNameW(handle, &p[0], DEFAULT_PATH_SIZE_ * i);
+            ec = last_error_code();
+
+            if (!ec) {
+                p.resize(size);
+                return boost::filesystem::path(p);
+            }
+        }
+
+        // Error other than ERROR_INSUFFICIENT_BUFFER_ occurred or failed to allocate buffer big enough
+        return boost::filesystem::path();
+    }
+
+}}} // namespace boost::dll::detail
+
+#endif // BOOST_DLL_DETAIL_WINDOWS_PATH_FROM_HANDLE_HPP
+