| /* |
| * Copyright (c) 2020 Endian Technologies AB |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #ifndef ZEPHYR_INCLUDE_NET_LWM2M_PATH_H_ |
| #define ZEPHYR_INCLUDE_NET_LWM2M_PATH_H_ |
| |
| /** |
| * @brief Generate LwM2M string paths using numeric components. |
| * |
| * Accepts at least one and up to four arguments. Each argument will be |
| * stringified by the pre-processor, so calling this with non-literals will |
| * likely not do what you want. For example, |
| * |
| * #define MY_OBJ_ID 3 |
| * LWM2M_PATH(MY_OBJ_ID, 0, 1) |
| * |
| * would evaluate to "3/0/1", while |
| * |
| * int x = 3; |
| * LWM2M_PATH(x, 0, 1) |
| * |
| * evaluates to "x/0/1". |
| */ |
| #define LWM2M_PATH(...) \ |
| LWM2M_PATH_MACRO(__VA_ARGS__, LWM2M_PATH4, LWM2M_PATH3, \ |
| LWM2M_PATH2, LWM2M_PATH1)(__VA_ARGS__) |
| |
| |
| /* Internal helper macros for the LWM2M_PATH macro */ |
| #define LWM2M_PATH_VA_NUM_ARGS(...) \ |
| LWM2M_PATH_VA_NUM_ARGS_IMPL(__VA_ARGS__, 5, 4, 3, 2, 1) |
| #define LWM2M_PATH_VA_NUM_ARGS_IMPL(_1, _2, _3, _4, N, ...) N |
| |
| #define LWM2M_PATH1(_x) #_x |
| #define LWM2M_PATH2(_x, _y) #_x "/" #_y |
| #define LWM2M_PATH3(_x, _y, _z) #_x "/" #_y "/" #_z |
| #define LWM2M_PATH4(_a, _x, _y, _z) #_a "/" #_x "/" #_y "/" #_z |
| |
| #define LWM2M_PATH_MACRO(_1, _2, _3, _4, NAME, ...) NAME |
| |
| |
| |
| #endif /* ZEPHYR_INCLUDE_NET_LWM2M_PATH_H_ */ |
