scripts/config/list.h

   1 #ifndef LIST_H
   2 #define LIST_H
   3
   4 /*
   5  * Copied from include/linux/...
   6  */
   7
   8 #undef offsetof
   9 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
  10
  11 /**
  12  * container_of - cast a member of a structure out to the containing structure
  13  * @ptr:        the pointer to the member.
  14  * @type:       the type of the container struct this is embedded in.
  15  * @member:     the name of the member within the struct.
  16  *
  17  */
  18 #define container_of(ptr, type, member) ({                      \
  19         const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
  20         (type *)( (char *)__mptr - offsetof(type,member) );})
  21
  22
  23 struct list_head {
  24         struct list_head *next, *prev;
  25 };
  26
  27
  28 #define LIST_HEAD_INIT(name) { &(name), &(name) }
  29
  30 #define LIST_HEAD(name) \
  31         struct list_head name = LIST_HEAD_INIT(name)
  32
  33 /**
  34  * list_entry - get the struct for this entry
  35  * @ptr:        the &struct list_head pointer.
  36  * @type:       the type of the struct this is embedded in.
  37  * @member:     the name of the list_struct within the struct.
  38  */
  39 #define list_entry(ptr, type, member) \
  40         container_of(ptr, type, member)
  41
  42 /**
  43  * list_for_each_entry  -       iterate over list of given type
  44  * @pos:        the type * to use as a loop cursor.
  45  * @head:       the head for your list.
  46  * @member:     the name of the list_struct within the struct.
  47  */
  48 #define list_for_each_entry(pos, head, member)                          \
  49         for (pos = list_entry((head)->next, typeof(*pos), member);      \
  50              &pos->member != (head);    \
  51              pos = list_entry(pos->member.next, typeof(*pos), member))
  52
  53 /**
  54  * list_empty - tests whether a list is empty
  55  * @head: the list to test.
  56  */
  57 static inline int list_empty(const struct list_head *head)
  58 {
  59         return head->next == head;
  60 }
  61
  62 /*
  63  * Insert a new entry between two known consecutive entries.
  64  *
  65  * This is only for internal list manipulation where we know
  66  * the prev/next entries already!
  67  */
  68 static inline void __list_add(struct list_head *_new,
  69                               struct list_head *prev,
  70                               struct list_head *next)
  71 {
  72         next->prev = _new;
  73         _new->next = next;
  74         _new->prev = prev;
  75         prev->next = _new;
  76 }
  77
  78 /**
  79  * list_add_tail - add a new entry
  80  * @new: new entry to be added
  81  * @head: list head to add it before
  82  *
  83  * Insert a new entry before the specified head.
  84  * This is useful for implementing queues.
  85  */
  86 static inline void list_add_tail(struct list_head *_new, struct list_head *head)
  87 {
  88         __list_add(_new, head->prev, head);
  89 }
  90
  91 #endif