From 5472514f4bfdca2831070de3c6d3b6cc8070b1a0 Mon Sep 17 00:00:00 2001
From: Lynix <lynix680@gmail.com>
Date: Fri, 1 Dec 2023 20:59:21 +0100
Subject: [PATCH] Core: Add EnvironmentVariables

---
 include/Nazara/Core/EnvironmentVariables.hpp | 21 +++++++++++
 include/Nazara/Core/EnvironmentVariables.inl | 11 ++++++
 src/Nazara/Core/EnvironmentVariables.cpp     | 39 ++++++++++++++++++++
 src/Nazara/Core/PluginLoader.cpp             |  3 +-
 4 files changed, 73 insertions(+), 1 deletion(-)
 create mode 100644 include/Nazara/Core/EnvironmentVariables.hpp
 create mode 100644 include/Nazara/Core/EnvironmentVariables.inl
 create mode 100644 src/Nazara/Core/EnvironmentVariables.cpp

diff --git a/include/Nazara/Core/EnvironmentVariables.hpp b/include/Nazara/Core/EnvironmentVariables.hpp
new file mode 100644
index 000000000..c5e189dae
--- /dev/null
+++ b/include/Nazara/Core/EnvironmentVariables.hpp
@@ -0,0 +1,21 @@
+// Copyright (C) 2023 Jérôme "Lynix" Leclercq (lynix680@gmail.com)
+// This file is part of the "Nazara Engine - Core module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#pragma once
+
+#ifndef NAZARA_CORE_ENVIRONMENTVARIABLES_HPP
+#define NAZARA_CORE_ENVIRONMENTVARIABLES_HPP
+
+#include <NazaraUtils/Prerequisites.hpp>
+#include <Nazara/Core/Config.hpp>
+
+namespace Nz
+{
+	NAZARA_CORE_API const char* GetEnvironmentVariable(const char* envVar);
+	NAZARA_CORE_API bool TestEnvironmentVariable(const char* envVar);
+}
+
+#include <Nazara/Core/EnvironmentVariables.inl>
+
+#endif // NAZARA_CORE_ENVIRONMENTVARIABLES_HPP
diff --git a/include/Nazara/Core/EnvironmentVariables.inl b/include/Nazara/Core/EnvironmentVariables.inl
new file mode 100644
index 000000000..3846a912d
--- /dev/null
+++ b/include/Nazara/Core/EnvironmentVariables.inl
@@ -0,0 +1,11 @@
+// Copyright (C) 2023 Jérôme "Lynix" Leclercq (lynix680@gmail.com)
+// This file is part of the "Nazara Engine - Core module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Core/Debug.hpp>
+
+namespace Nz
+{
+}
+
+#include <Nazara/Core/DebugOff.hpp>
diff --git a/src/Nazara/Core/EnvironmentVariables.cpp b/src/Nazara/Core/EnvironmentVariables.cpp
new file mode 100644
index 000000000..b328aad4b
--- /dev/null
+++ b/src/Nazara/Core/EnvironmentVariables.cpp
@@ -0,0 +1,39 @@
+// Copyright (C) 2023 Jérôme "Lynix" Leclercq (lynix680@gmail.com)
+// This file is part of the "Nazara Engine - Core module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Core/EnvironmentVariables.hpp>
+#include <cstdlib>
+#include <string_view>
+#include <Nazara/Core/Debug.hpp>
+
+namespace Nz
+{
+	const char* GetEnvironmentVariable(const char* envVar)
+	{
+		return std::getenv(envVar);
+	}
+
+	bool TestEnvironmentVariable(const char* envVar)
+	{
+		const char* value = GetEnvironmentVariable(envVar);
+		if (!value)
+			return false;
+
+		// Environment variable exists, recognize some values as disabling it
+		using namespace std::string_view_literals;
+		constexpr std::array disabledValues = {
+			"0"sv,
+			"n"sv,
+			"false"sv,
+		};
+
+		for (std::string_view disabledValue : disabledValues)
+		{
+			if (value == disabledValue)
+				return false;
+		}
+
+		return true;
+	}
+}
diff --git a/src/Nazara/Core/PluginLoader.cpp b/src/Nazara/Core/PluginLoader.cpp
index 7bc0b5e01..a56b501ce 100644
--- a/src/Nazara/Core/PluginLoader.cpp
+++ b/src/Nazara/Core/PluginLoader.cpp
@@ -4,6 +4,7 @@
 
 #include <Nazara/Core/PluginLoader.hpp>
 #include <Nazara/Core/DynLib.hpp>
+#include <Nazara/Core/EnvironmentVariables.hpp>
 #include <Nazara/Core/Error.hpp>
 #include <NazaraUtils/Algorithm.hpp>
 #include <stdexcept>
@@ -15,7 +16,7 @@ namespace Nz
 	{
 		AddSearchDirectory(".");
 		AddSearchDirectory("plugins");
-		if (const char* path = getenv("NAZARA_PLUGIN_DIR"))
+		if (const char* path = GetEnvironmentVariable("NAZARA_PLUGIN_DIR"))
 			AddSearchDirectory(Utf8Path(path));
 	}