xiaoxiang781216 commented on code in PR #6926:
URL: https://github.com/apache/incubator-nuttx/pull/6926#discussion_r957362164
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include/nuttx/list.h:
##########
@@ -37,8 +37,67 @@
#define LIST_INITIAL_VALUE(list) { &(list), &(list) }
#define LIST_INITIAL_CLEARED_VALUE { NULL, NULL }
+#define list_in_list(item) ((item)->prev || (item)->next)
+#define list_is_empty(list) ((list)->next == list)
+#define list_is_clear(list) ((list)->next == NULL)
+
+#define list_initialize(list) \
+ do \
+ { \
+ (list)->prev = (list)->next = (list); \
+ } \
+ while(0)
+
+#define list_clear_node(item) \
+ do \
+ { \
+ (item)->prev = (item)->next = NULL; \
+ } \
+ while (0)
+
+#define list_peek_head(list) ((list)->next != (list) ? (list)->next : NULL)
+#define list_peek_tail(list) ((list)->prev != (list) ? (list)->prev : NULL)
+
+#define list_prev(list, item) ((item)->prev != (list) ? (item)->prev : NULL)
+#define list_prev_wrap(list, item) \
+ ((item)->prev != (list) ? (item)->prev : \
+ (item)->prev->prev != (list) ? (item)->prev->prev : NULL)
+
+#define list_next(list, item) ((item)->next != (list) ? (item)->next : NULL)
+#define list_next_wrap(list, item) \
+ ((item)->next != (list) ? (item)->next : \
+ (item)->next->next != (list) ? (item)->next->next : NULL)
+
#define list_add_after(entry, new_entry) list_add_head(entry, new_entry)
+#define list_add_head(list, item) \
+ do \
+ { \
+ (item)->next = (list)->next; \
+ (item)->prev = (list); \
+ (list)->next->prev = (item); \
+ (list)->next = (item); \
+ } \
+ while (0)
+
#define list_add_before(entry, new_entry) list_add_tail(entry, new_entry)
+#define list_add_tail(list, item) \
+ do \
+ { \
+ (item)->prev = (list)->prev; \
+ (item)->next = (list); \
+ (list)->prev->next = (item); \
+ (list)->prev = (item); \
+ } \
+ while (0)
+
+#define list_delete(item) \
+ do \
+ { \
+ (item)->next->prev = (item)->prev; \
+ (item)->prev->next = (item)->next; \
+ (item)->prev = (item)->next = 0; \
Review Comment:
Done.
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