mdblist.h

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#ifndef _NCS_DBLIST_H
#define _NCS_DBLIST_H

#ifdef __cplusplus
extern "C" {
#endif

struct list_head {
    struct list_head *next, *prev;
};

typedef struct list_head list_t;

#define LIST_HEAD_INIT(name) { &(name), &(name) }

/* define and init a list head */
#define LIST_HEAD(name) \
    struct list_head name = LIST_HEAD_INIT(name)

/* init a list head */
#define INIT_LIST_HEAD(ptr) do { \
    (ptr)->next = (ptr); (ptr)->prev = (ptr); \
} while (0)

/*
 * \fn void __list_add(struct list_head * _new, \
                struct list_head * prev, \
                struct list_head * next)
 * \brief Insert a _new entry between two known consecutive entries. 
 *
 * This is only for internal list manipulation where we know
 * the prev/next entries already!
 */
static inline void __list_add(struct list_head * _new,
    struct list_head * prev,
    struct list_head * next)
{
    next->prev = _new;
    _new->next = next;
    _new->prev = prev;
    prev->next = _new;
}

static inline void list_add(struct list_head *_new, struct list_head *head)
{
    __list_add(_new, head, head->next);
}

static inline void list_add_tail(struct list_head *_new, struct list_head *head)
{
    __list_add(_new, head->prev, head);
}

/*
 * \fn  void __list_del(struct list_head * prev, \
                  struct list_head * next)
 * \brief Delete a list entry by making the prev/next entries
 * point to each other.
 *
 * This is only for internal list manipulation where we know
 * the prev/next entries already!
 */
static inline void __list_del(struct list_head * prev,
                  struct list_head * next)
{
    next->prev = prev;
    prev->next = next;
}

static inline void list_del(struct list_head *entry)
{
    __list_del(entry->prev, entry->next);
}

static inline void list_del_init(struct list_head *entry)
{
    __list_del(entry->prev, entry->next);
    INIT_LIST_HEAD(entry); 
}

static inline int list_empty(struct list_head *head)
{
    return head->next == head;
}

#define list_entry(ptr, type, member) \
    ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))

#define list_for_each(pos, head) \
    for (pos = (head)->next; pos != (head); pos = pos->next)
            
#define list_for_each_safe(pos, n, head) \
    for (pos = (head)->next, n = pos->next; pos != (head); \
        pos = n, n = pos->next)

#define list_for_each_ex(pos, head, begin) \
    for (pos = (begin)->next; pos != (head); pos = (pos)->next)

#define list_for_index(pos, i, head, index) \
    for (pos = (head)->next, i=0; (pos != (head) && i < index); pos = pos->next,i++)


static inline int list_add_by_index(struct list_head *_new, struct list_head *head, int index)
{
    list_t *pos = head;
    int i = -1;

    if (index >= 0) {
        for (pos = (head)->next, i=0; (pos != (head) && i < index); pos = pos->next,i++);
    }
    list_add_tail (_new, pos);
    return i;
}


/* added for normal list operations */
#define GETBY_EX(func, head, entrytype, member, datatype, ret, equal_cond) \
        void* func (datatype data) \
        { \
            list_t *me; \
            entrytype *pdata; \
            int i = 0; \
            \
            list_for_each(me, head) { \
                pdata = list_entry(me, entrytype, member); \
                if (equal_cond) \
                    return ret; \
            } \
            return NULL; \
        }

#define GET_LIST_BY_DATA(func, head, entrytype, member, datamember, datatype) \
        GETBY_EX(func, head, entrytype, member, datatype, me, (pdata->datamember == data))

#define GET_ENTRY_BY_DATA(func, head, entrytype, member, datamember, datatype) \
        GETBY_EX(func, head, entrytype, member, datatype, pdata, (pdata->datamember == data))

/* for string */
#define GET_LIST_BY_STRING(func, head, entrytype, member, datamember, datatype) \
        GETBY_EX(func, head, entrytype, member, datatype, me, (strcmp(pdata->datamember,data)==0))

#define GET_ENTRY_BY_STRING(func, head, entrytype, member, datamember, datatype) \
        GETBY_EX(func, head, entrytype, member, datatype, pdata, (strcmp(pdata->datamember,data)==0))

/* for index */
#define GET_ENTRY_BY_INDEX(func, entrytype, member) \
        static inline entrytype* func (list_t *head, int index) \
        { \
            list_t *me; \
            int i = 0; \
            \
            list_for_each(me, head) { \
                if (i++ == index) \
                    return list_entry(me, entrytype, member); \
            } \
            return NULL; \
        }

#define GET_ENTRY_INDEX(func, entrytype, member) \
        static inline int func (list_t *head, entrytype* entry) \
        { \
            list_t *me; \
            int i = 0; \
            \
            list_for_each(me, head) { \
                if (entry == list_entry(me, entrytype, member)) \
                    return i; \
                i++; \
            } \
            return -1; \
        }

#ifdef __cplusplus
}
#endif

#endif /* _NCS_DBLIST_H */