| /* |
| * |
| * Copyright (c) 2021 Project CHIP Authors |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /** |
| * @file |
| * This file defines and implements some utlities for generating persistent storage keys |
| * |
| */ |
| |
| #pragma once |
| |
| #include <lib/support/CodeUtils.h> |
| |
| namespace chip { |
| |
| // This macro generates a key for storage using a node ID and a key prefix, and performs the given action |
| // on that key. |
| #define PERSISTENT_KEY_OP(node, keyPrefix, key, action) \ |
| do \ |
| { \ |
| constexpr size_t len = std::extent<decltype(keyPrefix)>::value; \ |
| static_assert(len > 0, "keyPrefix length must be known at compile time"); \ |
| /* 2 * sizeof(chip::NodeId) to accommodate 2 character for each byte in Node Id */ \ |
| char key[len + 2 * sizeof(chip::NodeId) + 1]; \ |
| static_assert(sizeof(node) <= sizeof(uint64_t), "Node ID size is greater than expected"); \ |
| /* Be careful about switching to ChipLogFormatX64: it would change the storage keys! */ \ |
| snprintf(key, sizeof(key), "%s%" PRIx64, keyPrefix, node); \ |
| action; \ |
| } while (0) |
| |
| } // namespace chip |
