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diff --git a/modules/mono/utils/mono_reg_utils.cpp b/modules/mono/utils/mono_reg_utils.cpp
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+/*************************************************************************/
+/* mono_reg_utils.cpp */
+/*************************************************************************/
+/* This file is part of: */
+/* GODOT ENGINE */
+/* https://godotengine.org */
+/*************************************************************************/
+/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
+/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md) */
+/* */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the */
+/* "Software"), to deal in the Software without restriction, including */
+/* without limitation the rights to use, copy, modify, merge, publish, */
+/* distribute, sublicense, and/or sell copies of the Software, and to */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions: */
+/* */
+/* The above copyright notice and this permission notice shall be */
+/* included in all copies or substantial portions of the Software. */
+/* */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
+/*************************************************************************/
+#include "mono_reg_utils.h"
+
+#ifdef WINDOWS_ENABLED
+
+#include "os/os.h"
+
+// Here, after os/os.h
+#include <windows.h>
+
+namespace MonoRegUtils {
+
+template <int>
+REGSAM bitness_sam_impl();
+
+template <>
+REGSAM bitness_sam_impl<4>() {
+ return KEY_WOW64_64KEY;
+}
+
+template <>
+REGSAM bitness_sam_impl<8>() {
+ return KEY_WOW64_32KEY;
+}
+
+REGSAM _get_bitness_sam() {
+ return bitness_sam_impl<sizeof(size_t)>();
+}
+
+LONG _RegOpenKey(HKEY hKey, LPCWSTR lpSubKey, PHKEY phkResult) {
+
+ LONG res = RegOpenKeyExW(hKey, lpSubKey, 0, KEY_READ, phkResult);
+
+ if (res != ERROR_SUCCESS)
+ res = RegOpenKeyExW(hKey, lpSubKey, 0, KEY_READ | _get_bitness_sam(), phkResult);
+
+ return res;
+}
+
+LONG _RegKeyQueryString(HKEY hKey, const String &p_value_name, String &r_value) {
+
+ Vector<WCHAR> buffer;
+ buffer.resize(512);
+ DWORD dwBufferSize = buffer.size();
+
+ LONG res = RegQueryValueExW(hKey, p_value_name.c_str(), 0, NULL, (LPBYTE)buffer.ptr(), &dwBufferSize);
+
+ if (res == ERROR_MORE_DATA) {
+ // dwBufferSize now contains the actual size
+ Vector<WCHAR> buffer;
+ buffer.resize(dwBufferSize);
+ res = RegQueryValueExW(hKey, p_value_name.c_str(), 0, NULL, (LPBYTE)buffer.ptr(), &dwBufferSize);
+ }
+
+ if (res == ERROR_SUCCESS) {
+ r_value = String(buffer.ptr(), buffer.size());
+ } else {
+ r_value = String();
+ }
+
+ return res;
+}
+
+LONG _find_mono_in_reg(const String &p_subkey, MonoRegInfo &r_info, bool p_old_reg = false) {
+
+ HKEY hKey;
+ LONG res = _RegOpenKey(HKEY_LOCAL_MACHINE, p_subkey.c_str(), &hKey);
+
+ if (res != ERROR_SUCCESS)
+ goto cleanup;
+
+ if (!p_old_reg) {
+ res = _RegKeyQueryString(hKey, "Version", r_info.version);
+ if (res != ERROR_SUCCESS)
+ goto cleanup;
+ }
+
+ res = _RegKeyQueryString(hKey, "SdkInstallRoot", r_info.install_root_dir);
+ if (res != ERROR_SUCCESS)
+ goto cleanup;
+
+ res = _RegKeyQueryString(hKey, "FrameworkAssemblyDirectory", r_info.assembly_dir);
+ if (res != ERROR_SUCCESS)
+ goto cleanup;
+
+ res = _RegKeyQueryString(hKey, "MonoConfigDir", r_info.config_dir);
+ if (res != ERROR_SUCCESS)
+ goto cleanup;
+
+ if (r_info.install_root_dir.ends_with("\\"))
+ r_info.bin_dir = r_info.install_root_dir + "bin";
+ else
+ r_info.bin_dir = r_info.install_root_dir + "\\bin";
+
+cleanup:
+ RegCloseKey(hKey);
+ return res;
+}
+
+LONG _find_mono_in_reg_old(const String &p_subkey, MonoRegInfo &r_info) {
+
+ String default_clr;
+
+ HKEY hKey;
+ LONG res = _RegOpenKey(HKEY_LOCAL_MACHINE, p_subkey.c_str(), &hKey);
+
+ if (res != ERROR_SUCCESS)
+ goto cleanup;
+
+ res = _RegKeyQueryString(hKey, "DefaultCLR", default_clr);
+
+ if (res == ERROR_SUCCESS && default_clr.length()) {
+ r_info.version = default_clr;
+ res = _find_mono_in_reg(p_subkey + "\\" + default_clr, r_info, true);
+ }
+
+cleanup:
+ RegCloseKey(hKey);
+ return res;
+}
+
+MonoRegInfo find_mono() {
+
+ MonoRegInfo info;
+
+ if (_find_mono_in_reg("Software\\Mono", info) == ERROR_SUCCESS)
+ return info;
+
+ if (_find_mono_in_reg_old("Software\\Novell\\Mono", info) == ERROR_SUCCESS)
+ return info;
+
+ ERR_PRINT("Cannot find mono in the registry");
+
+ return MonoRegInfo();
+}
+
+String find_msbuild_tools_path() {
+
+ String msbuild_tools_path;
+
+ // Try to find 15.0 with vswhere
+
+ String vswhere_path = OS::get_singleton()->get_environment(sizeof(size_t) == 8 ? "ProgramFiles(x86)" : "ProgramFiles");
+ vswhere_path += "\\Microsoft Visual Studio\\Installer\\vswhere.exe";
+
+ List<String> vswhere_args;
+ vswhere_args.push_back("-latest");
+ vswhere_args.push_back("-requires");
+ vswhere_args.push_back("Microsoft.Component.MSBuild");
+
+ String output;
+ int exit_code;
+ OS::get_singleton()->execute(vswhere_path, vswhere_args, true, NULL, &output, &exit_code);
+
+ if (exit_code == 0) {
+ Vector<String> lines = output.split("\n");
+
+ for (int i = 0; i < lines.size(); i++) {
+ const String &line = lines[i];
+ int sep_idx = line.find(":");
+
+ if (sep_idx > 0) {
+ String key = line.substr(0, sep_idx); // No need to trim
+
+ if (key == "installationPath") {
+ String val = line.substr(sep_idx + 1, line.length()).strip_edges();
+
+ ERR_BREAK(val.empty());
+
+ if (!val.ends_with("\\")) {
+ val += "\\";
+ }
+
+ return val + "MSBuild\\15.0\\Bin";
+ }
+ }
+ }
+ }
+
+ // Try to find 14.0 in the Registry
+
+ HKEY hKey;
+ LONG res = _RegOpenKey(HKEY_LOCAL_MACHINE, L"SOFTWARE\\Microsoft\\MSBuild\\ToolsVersions\\14.0", &hKey);
+
+ if (res != ERROR_SUCCESS)
+ goto cleanup;
+
+ res = _RegKeyQueryString(hKey, "MSBuildToolsPath", msbuild_tools_path);
+
+ if (res != ERROR_SUCCESS)
+ goto cleanup;
+
+cleanup:
+ RegCloseKey(hKey);
+
+ return msbuild_tools_path;
+}
+} // namespace MonoRegUtils
+
+#endif WINDOWS_ENABLED
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