source: rtems/cpukit/libdrvmgr/drvmgr_list.c @ bef5e23e

/* 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.org/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;
}