[Core] Added POSIX support (Experimental)

Thanks to Danman
I don't think it actually compile although tried my best to correct
code.


Former-commit-id: c3366c2c924f7392f4d46824dafca63ecf7f1fea

src/Nazara/Core/Posix/DynLibImpl.cpp

@@ -0,0 +1,61 @@
+// Copyright (C) 2012 Alexandre Janniaux
+// 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/Posix/DynLibImpl.hpp>
+#include <Nazara/Core/DynLib.hpp>
+#include <Nazara/Core/Error.hpp>
+#include <Nazara/Core/String.hpp>
+#include <Nazara/Core/Debug.hpp>
+
+NzDynLibImpl::NzDynLibImpl(NzDynLib* parent) :
+m_parent(parent)
+{
+}
+
+NzDynLibFunc NzDynLibImpl::GetSymbol(const NzString& symbol) const
+{
+	/*
+		Il n'est pas standard de cast un pointeur d'objet vers un pointeur de fonction.
+		Nous devons donc utiliser des techniques diaboliques venant du malin lui-même.. :D
+		Au moins ce n'est pas aussi terrible qu'un const_cast
+		-Lynix
+	*/
+	union
+	{
+		NzDynLibFunc func;
+		void* pointer;
+	} converter;
+
+	dlerror(); // Clear error flag
+
+	converter.pointer = reinterpret_cast<NzDynLibFunc>(dlsym(m_handle, symbol.GetConstBuffer()));
+	if (!converter.pointer)
+		m_parent->SetLastError(dlerror());
+
+	return converter.func;
+}
+
+bool NzDynLibImpl::Load(const NzString& libraryPath)
+{
+	NzString path = libraryPath;
+	if (!path.EndsWith(".so"))
+		path += ".so";
+
+	dlerror(); // Clear error flag
+
+	m_handle = dlopen(path.GetConstBuffer());
+
+	if (m_handle)
+		return true;
+	else
+	{
+		m_parent->SetLastError(dlerror());
+		return false;
+	}
+}
+
+void NzDynLibImpl::Unload()
+{
+	dlclose(m_handle);
+}