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