Service: Make service registration part of the sm implementation

Also enhances the GetServiceHandle implementation to be more accurate.

src/core/hle/service/sm/sm.cpp

@@ -0,0 +1,58 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <tuple>
+#include "core/hle/kernel/client_session.h"
+#include "core/hle/kernel/server_port.h"
+#include "core/hle/result.h"
+#include "core/hle/service/sm/sm.h"
+
+namespace Service {
+namespace SM {
+
+static ResultCode ValidateServiceName(const std::string& name) {
+    if (name.size() <= 0 || name.size() > 8) {
+        return ERR_INVALID_NAME_SIZE;
+    }
+    if (name.find('\0') != std::string::npos) {
+        return ERR_NAME_CONTAINS_NUL;
+    }
+    return RESULT_SUCCESS;
+}
+
+ResultVal<Kernel::SharedPtr<Kernel::ServerPort>> ServiceManager::RegisterService(
+    std::string name, unsigned int max_sessions) {
+
+    CASCADE_CODE(ValidateServiceName(name));
+    Kernel::SharedPtr<Kernel::ServerPort> server_port;
+    Kernel::SharedPtr<Kernel::ClientPort> client_port;
+    std::tie(server_port, client_port) = Kernel::ServerPort::CreatePortPair(max_sessions, name);
+
+    registered_services.emplace(name, std::move(client_port));
+    return MakeResult<Kernel::SharedPtr<Kernel::ServerPort>>(std::move(server_port));
+}
+
+ResultVal<Kernel::SharedPtr<Kernel::ClientPort>> ServiceManager::GetServicePort(
+    const std::string& name) {
+
+    CASCADE_CODE(ValidateServiceName(name));
+    auto it = registered_services.find(name);
+    if (it == registered_services.end()) {
+        return ERR_SERVICE_NOT_REGISTERED;
+    }
+
+    return MakeResult<Kernel::SharedPtr<Kernel::ClientPort>>(it->second);
+}
+
+ResultVal<Kernel::SharedPtr<Kernel::ClientSession>> ServiceManager::ConnectToService(
+    const std::string& name) {
+
+    CASCADE_RESULT(auto client_port, GetServicePort(name));
+    return client_port->Connect();
+}
+
+std::unique_ptr<ServiceManager> g_service_manager;
+
+} // namespace SM
+} // namespace Service