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lib: Tweaks to linked list macros

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* lib/linklist.h

    - Change the listnextnode, listhead and listtail macros so that
      they allow the list pointer to be NULL.

    - Modify the ALL_LIST_ELEMENTS* macros such that they clear the
      data pointer at the beginning and end of the loop.

From: Josh Bailey <joshb@google.com>
Signed-off-by: Avneesh Sachdev <avneesh@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@diac24.net>
This commit is contained in:
Josh Bailey 2012-03-21 10:00:07 -07:00 committed by Avneesh Sachdev
parent 8ced4e82e6
commit 54dd612273
1 changed files with 7 additions and 7 deletions
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14
lib/linklist.h
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@ -54,9 +54,9 @@ struct list
void (*del) (void *val);
};
#define listnextnode(X) ((X)->next)
#define listhead(X) ((X)->head)
#define listtail(X) ((X)->tail)
#define listnextnode(X) ((X) ? ((X)->next) : NULL)
#define listhead(X) ((X) ? ((X)->head) : NULL)
#define listtail(X) ((X) ? ((X)->tail) : NULL)
#define listcount(X) ((X)->count)
#define list_isempty(X) ((X)->head == NULL && (X)->tail == NULL)
#define listgetdata(X) (assert((X)->data != NULL), (X)->data)
@ -88,10 +88,10 @@ extern void list_add_list (struct list *, struct list *);
* It is safe to delete the listnode using this macro.
*/
#define ALL_LIST_ELEMENTS(list,node,nextnode,data) \
(node) = listhead(list); \
(node) = listhead(list), ((data) = NULL); \
(node) != NULL && \
((data) = listgetdata(node),(nextnode) = listnextnode(node), 1); \
(node) = (nextnode)
(node) = (nextnode), ((data) = NULL)
/* read-only list iteration macro.
* Usage: as per ALL_LIST_ELEMENTS, but not safe to delete the listnode Only
@ -100,9 +100,9 @@ extern void list_add_list (struct list *, struct list *);
* of previous macro.
*/
#define ALL_LIST_ELEMENTS_RO(list,node,data) \
(node) = listhead(list); \
(node) = listhead(list), ((data) = NULL);\
(node) != NULL && ((data) = listgetdata(node), 1); \
(node) = listnextnode(node)
(node) = listnextnode(node), ((data) = NULL)
/* these *do not* cleanup list nodes and referenced data, as the functions
* do - these macros simply {de,at}tach a listnode from/to a list.