From 1f7d2131e8aed5784c49864eaff65a903e84075f Mon Sep 17 00:00:00 2001
From: LoRd_MuldeR <mulder2@gmx.de>
Date: Sun, 2 Oct 2016 15:21:58 +0200
Subject: [PATCH] Make it possible to set an extra PATH string for the new
 process, which (will be prepended to PATH environment variable (e.g for
 loading extra DLL's).

---
 include/MUtils/Global.h    |  2 +-
 include/MUtils/OSSupport.h |  4 +++
 src/Global.cpp             | 16 ++++++++--
 src/OSSupport_Win32.cpp    | 61 ++++++++++++++++++++++++++++++++++++++
 4 files changed, 79 insertions(+), 4 deletions(-)

diff --git a/include/MUtils/Global.h b/include/MUtils/Global.h
index 22fdd7a..e25957d 100644
--- a/include/MUtils/Global.h
+++ b/include/MUtils/Global.h
@@ -76,7 +76,7 @@ namespace MUtils
 	MUTILS_API const QString& temp_folder(void);
 
 	//Process Utils
-	MUTILS_API void init_process(QProcess &process, const QString &wokringDir, const bool bReplaceTempDir = true);
+	MUTILS_API void init_process(QProcess &process, const QString &wokringDir, const bool bReplaceTempDir = true, const QString &extraPath = QString());
 
 	//Random
 	MUTILS_API void seed_rand(void);
diff --git a/include/MUtils/OSSupport.h b/include/MUtils/OSSupport.h
index 32cedd2..86df8ba 100644
--- a/include/MUtils/OSSupport.h
+++ b/include/MUtils/OSSupport.h
@@ -190,6 +190,10 @@ namespace MUtils
 		MUTILS_API bool wow64fsredir_disable(void *oldValue);
 		MUTILS_API bool wow64fsredir_revert (void *oldValue);
 
+		//Environment variables
+		MUTILS_API QString get_envvar(const QString &name);
+		MUTILS_API bool set_envvar(const QString &name, const QString &value);
+
 		//Check if debugger is present
 		MUTILS_API void check_debugger(void);
 
diff --git a/src/Global.cpp b/src/Global.cpp
index 88f2c3f..26fd3bf 100644
--- a/src/Global.cpp
+++ b/src/Global.cpp
@@ -384,7 +384,14 @@ bool MUtils::remove_directory(const QString &folderPath, const bool &recursive)
 // PROCESS UTILS
 ///////////////////////////////////////////////////////////////////////////////
 
-void MUtils::init_process(QProcess &process, const QString &wokringDir, const bool bReplaceTempDir)
+static void prependToPath(QProcessEnvironment &env, const QString &value)
+{
+	const QLatin1String PATH = QLatin1String("PATH");
+	const QString path = env.value(PATH, QString()).trimmed();
+	env.insert(PATH, path.isEmpty() ? value : QString("%1;%2").arg(value, path));
+}
+
+void MUtils::init_process(QProcess &process, const QString &wokringDir, const bool bReplaceTempDir, const QString &extraPath)
 {
 	//Environment variable names
 	static const char *const s_envvar_names_temp[] =
@@ -419,8 +426,11 @@ void MUtils::init_process(QProcess &process, const QString &wokringDir, const bo
 	}
 
 	//Setup PATH variable
-	const QString path = env.value("PATH", QString()).trimmed();
-	env.insert("PATH", path.isEmpty() ? tempDir : QString("%1;%2").arg(tempDir, path));
+	prependToPath(env, tempDir);
+	if (!extraPath.isEmpty())
+	{
+		prependToPath(env, QDir::toNativeSeparators(extraPath));
+	}
 	
 	//Setup QPorcess object
 	process.setWorkingDirectory(wokringDir);
diff --git a/src/OSSupport_Win32.cpp b/src/OSSupport_Win32.cpp
index f4fc18e..5eebc4b 100644
--- a/src/OSSupport_Win32.cpp
+++ b/src/OSSupport_Win32.cpp
@@ -1546,6 +1546,67 @@ bool MUtils::OS::wow64fsredir_revert(void *oldValue)
 // DEBUGGER CHECK
 ///////////////////////////////////////////////////////////////////////////////
 
+QString MUtils::OS::get_envvar(const QString &name)
+{
+	wchar_t *buffer = NULL;
+	size_t requiredSize = 0, buffSize = 0;
+	QString result;
+
+	forever
+	{
+		//Adjust the buffer size as required first!
+		if (buffSize < requiredSize)
+		{
+			if (buffer)
+			{
+				_freea(buffer);
+			}
+			if (!(buffer = (wchar_t*)_malloca(sizeof(wchar_t) * requiredSize)))
+			{
+				break; /*out of memory error!*/
+			}
+			buffSize = requiredSize;
+		}
+
+		//Try to fetch the environment variable now
+		const errno_t error = _wgetenv_s(&requiredSize, buffer, buffSize, MUTILS_WCHR(name));
+		if(!error)
+		{
+			if (requiredSize > 0)
+			{
+				result = MUTILS_QSTR(buffer);
+			}
+			break; /*done*/
+		}
+		else if (error != ERANGE)
+		{
+			break; /*somethging else went wrong!*/
+		}
+	}
+	
+	if (buffer)
+	{
+		_freea(buffer);
+		buffSize = 0;
+		buffer = NULL;
+	}
+
+	return result;
+}
+
+bool MUtils::OS::set_envvar(const QString &name, const QString &value)
+{
+	if (!_wputenv_s(MUTILS_WCHR(name), MUTILS_WCHR(value)))
+	{
+		return true;
+	}
+	return false;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// DEBUGGER CHECK
+///////////////////////////////////////////////////////////////////////////////
+
 #if (!(MUTILS_DEBUG))
 static __forceinline bool is_debugger_present(void)
 {