support/kconfig/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_for_each_entry_safe - iterate over list of given type safe against removal of list entry
  55  * @pos:        the type * to use as a loop cursor.
  56  * @n:          another type * to use as temporary storage
  57  * @head:       the head for your list.
  58  * @member:     the name of the list_struct within the struct.
  59  */
  60 #define list_for_each_entry_safe(pos, n, head, member)                  \
  61         for (pos = list_entry((head)->next, typeof(*pos), member),      \
  62                 n = list_entry(pos->member.next, typeof(*pos), member); \
  63              &pos->member != (head);                                    \
  64              pos = n, n = list_entry(n->member.next, typeof(*n), member))
  65
  66 /**
  67  * list_empty - tests whether a list is empty
  68  * @head: the list to test.
  69  */
  70 static inline int list_empty(const struct list_head *head)
  71 {
  72         return head->next == head;
  73 }
  74
  75 /*
  76  * Insert a new entry between two known consecutive entries.
  77  *
  78  * This is only for internal list manipulation where we know
  79  * the prev/next entries already!
  80  */
  81 static inline void __list_add(struct list_head *_new,
  82                               struct list_head *prev,
  83                               struct list_head *next)
  84 {
  85         next->prev = _new;
  86         _new->next = next;
  87         _new->prev = prev;
  88         prev->next = _new;
  89 }
  90
  91 /**
  92  * list_add_tail - add a new entry
  93  * @new: new entry to be added
  94  * @head: list head to add it before
  95  *
  96  * Insert a new entry before the specified head.
  97  * This is useful for implementing queues.
  98  */
  99 static inline void list_add_tail(struct list_head *_new, struct list_head *head)
 100 {
 101         __list_add(_new, head->prev, head);
 102 }
 103
 104 /*
 105  * Delete a list entry by making the prev/next entries
 106  * point to each other.
 107  *
 108  * This is only for internal list manipulation where we know
 109  * the prev/next entries already!
 110  */
 111 static inline void __list_del(struct list_head *prev, struct list_head *next)
 112 {
 113         next->prev = prev;
 114         prev->next = next;
 115 }
 116
 117 #define LIST_POISON1  ((void *) 0x00100100)
 118 #define LIST_POISON2  ((void *) 0x00200200)
 119 /**
 120  * list_del - deletes entry from list.
 121  * @entry: the element to delete from the list.
 122  * Note: list_empty() on entry does not return true after this, the entry is
 123  * in an undefined state.
 124  */
 125 static inline void list_del(struct list_head *entry)
 126 {
 127         __list_del(entry->prev, entry->next);
 128         entry->next = (struct list_head*)LIST_POISON1;
 129         entry->prev = (struct list_head*)LIST_POISON2;
 130 }
 131 #endif