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hashmap: implement api to iterate a hashmap backwards

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This commit is contained in:
Lennart Poettering 2009-06-17 03:02:19 +02:00
parent 277e8c5ce4
commit a1d84e3935
2 changed files with 42 additions and 1 deletions
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33
src/pulsecore/hashmap.c
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@ -237,6 +237,39 @@ at_end:
return NULL;
}
void *pa_hashmap_iterate_backwards(pa_hashmap *h, void **state, const void **key) {
struct hashmap_entry *e;
pa_assert(h);
pa_assert(state);
if (*state == (void*) -1)
goto at_beginning;
if (!*state && !h->iterate_list_tail)
goto at_beginning;
e = *state ? *state : h->iterate_list_tail;
if (e->iterate_previous)
*state = e->iterate_previous;
else
*state = (void*) -1;
if (key)
*key = e->key;
return e->value;
at_beginning:
*state = (void *) -1;
if (key)
*key = NULL;
return NULL;
}
void* pa_hashmap_first(pa_hashmap *h) {
pa_assert(h);