rres_utils.h

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#ifndef __UTILS_H__
#define __UTILS_H__

#include <linux/list.h>
#include "rres_config.h"

/* @todo (low) check all list operations, in particular the use of NULL value and *_NULL macro */
/* @todo (low) rename the macro parameters name adding __ */
/* @todo (mid) move here other functions? */
#define INIT_LIST_HEAD_NULL(ptr) do { (ptr)->prev = NULL; (ptr)->next = NULL; } while (0)

#define list_add_ordered(head, obj_type, obj, list_field, ord_field, ret) \
do { \
  struct list_head *h; \
  if (list_empty(&head)) { \
    list_add(&((obj)->list_field ), &(head)); \
    goto __ret1; \
  } else { \
    for (h = (head).next; h != &(head); h = h->next) { \
      if ((list_entry(h, struct obj_type, list_field)->ord_field) > (obj)->ord_field) { \
        break; \
      } \
    } \
    list_add_tail(&((obj)->list_field), h); \
  } \
  if (&((obj)->list_field) == (head).next) { \
    goto __ret1; \
  } \
  (ret) = 0; \
  break; \
__ret1: \
  (ret) = 1; \
} while (0)

static inline void list_del_null(struct list_head *entry)
{
  list_del(entry);
  entry->next = entry->prev = 0;
} 

#endif

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