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/* Driver Manager List Interface Implementation.
*
* COPYRIGHT (c) 2009.
* Cobham Gaisler AB.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#include <stdlib.h>
#include <drvmgr/drvmgr_list.h>
/* LIST interface */
void drvmgr_list_init(struct drvmgr_list *list, int offset)
{
list->head = list->tail = NULL;
list->ofs = offset;
}
void drvmgr_list_empty(struct drvmgr_list *list)
{
list->head = list->tail = NULL;
}
void drvmgr_list_add_head(struct drvmgr_list *list, void *entry)
{
LIST_FIELD(list, entry) = list->head;
if (list->head == NULL)
list->tail = entry;
list->head = entry;
}
void drvmgr_list_add_tail(struct drvmgr_list *list, void *entry)
{
if (list->tail == NULL)
list->head = entry;
else
LIST_FIELD(list, list->tail) = entry;
LIST_FIELD(list, entry) = NULL;
list->tail = entry;
}
void drvmgr_list_remove_head(struct drvmgr_list *list)
{
list->head = LIST_FIELD(list, list->head);
if (list->head == NULL)
list->tail = NULL;
}
void drvmgr_list_remove(struct drvmgr_list *list, void *entry)
{
void **prevptr = &list->head;
void *curr, *prev;
prev = NULL;
curr = list->head;
while (curr != entry) {
prev = curr;
prevptr = &LIST_FIELD(list, curr);
curr = LIST_FIELD(list, curr);
}
*prevptr = LIST_FIELD(list, entry);
if (list->tail == entry)
list->tail = prev;
}
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