Kernel/Userspace/LibC: Implement basic dprintln for userspace

kernel/kernel/Device/DebugDevice.cpp

@@ -0,0 +1,32 @@
+#include <kernel/Device/DebugDevice.h>
+#include <kernel/FS/DevFS/FileSystem.h>
+#include <kernel/Process.h>
+#include <kernel/Timer/Timer.h>
+
+namespace Kernel
+{
+
+	BAN::ErrorOr<BAN::RefPtr<DebugDevice>> DebugDevice::create(mode_t mode, uid_t uid, gid_t gid)
+	{
+		auto* result = new DebugDevice(mode, uid, gid, DevFileSystem::get().get_next_dev());
+		if (result == nullptr)
+			return BAN::Error::from_errno(ENOMEM);
+		return BAN::RefPtr<DebugDevice>::adopt(result);
+	}
+
+	BAN::ErrorOr<size_t> DebugDevice::write_impl(off_t, BAN::ConstByteSpan buffer)
+	{
+		auto ms_since_boot = SystemTimer::get().ms_since_boot();
+		Debug::DebugLock::lock();
+		BAN::Formatter::print(Debug::putchar, "[{5}.{3}] {}: ",
+			ms_since_boot / 1000,
+			ms_since_boot % 1000,
+			Kernel::Process::current().name()
+		);
+		for (size_t i = 0; i < buffer.size(); i++)
+			Debug::putchar(buffer[i]);
+		Debug::DebugLock::unlock();
+		return buffer.size();
+	}
+
+}