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Added macros for walking lists backwards.

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This commit is contained in:
Martin Mares 1999-08-03 19:31:30 +00:00
parent 9a706f32af
commit b6628a8c98
1 changed files with 4 additions and 0 deletions

4
lib/lists.h

@ -24,6 +24,10 @@ typedef struct list { /* In fact two overlayed nodes */
n=(void *)((NODE (n))->next))
#define WALK_LIST_DELSAFE(n,nxt,list) \
for(n=HEAD(list); nxt=(void *)((NODE (n))->next); n=(void *) nxt)
#define WALK_LIST_BACKWARDS(n,list) for(n=TAIL(list);(NODE (n))->prev; \
n=(void *)((NODE (n))->prev))
#define WALK_LIST_BACKWARDS_DELSAFE(n,prv,list) \
for(n=TAIL(list); prv=(void *)((NODE (n))->prev); n=(void *) prv)
#define EMPTY_LIST(list) (!(list).head->next)