Made current file relative to engine directory

Former-commit-id: 7a664df265a1d1b7f9b3594e34418163cc023eda

src/Nazara/Core/Directory.cpp

@@ -6,6 +6,7 @@
 #include <Nazara/Core/Config.hpp>
 #include <Nazara/Core/Error.hpp>
 #include <Nazara/Core/File.hpp>
+#include <cstring>
 
 #if defined(NAZARA_PLATFORM_WINDOWS)
 	#include <Nazara/Core/Win32/DirectoryImpl.hpp>
@@ -293,6 +294,30 @@ NzString NzDirectory::GetCurrent()
 	return currentPath;
 }
 
+const char* NzDirectory::GetCurrentFileRelativeToEngine(const char* currentFile)
+{
+	///FIXME: Est-ce que cette méthode est au bon endroit ?
+	static int offset = -1;
+
+	if (offset < 0)
+	{
+		const char* directoryFile = __FILE__;
+		const char* ptr = std::strstr(directoryFile, "NazaraEngine/src/Nazara/Core/Directory.cpp");
+		if (ptr)
+			offset = ptr - directoryFile;
+		else
+		{
+			ptr = std::strstr(directoryFile, "NazaraEngine\\src\\Nazara\\Core\\Directory.cpp");
+			if (ptr)
+				offset = ptr - directoryFile;
+			else
+				offset = 0;
+		}
+	}
+
+	return &currentFile[offset];
+}
+
 bool NzDirectory::Remove(const NzString& dirPath, bool emptyDirectory)
 {
 	if (dirPath.IsEmpty())