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authorAllan McRae <allan@archlinux.org>2011-01-30 22:42:45 +1000
committerAllan McRae <allan@archlinux.org>2011-02-04 09:55:45 +1000
commit01c3c7e4f28d837f0b8a6aaaf27d16894d4b762d (patch)
treedce1eecbcc7961ac318d7732e14dd9ded075048c /lib/libalpm/pkghash.c
parent11e5e86151f83219b1cedbca31be7530911e25eb (diff)
Actually remove packages from pkghash on removal
Fully removes a package from the hash. Also unify prototype with removal from an alpm_list_t, fixing issues when removing a package from the pkgcache. Signed-off-by: Allan McRae <allan@archlinux.org>
Diffstat (limited to 'lib/libalpm/pkghash.c')
-rw-r--r--lib/libalpm/pkghash.c37
1 files changed, 29 insertions, 8 deletions
diff --git a/lib/libalpm/pkghash.c b/lib/libalpm/pkghash.c
index bdff78ea..14056e37 100644
--- a/lib/libalpm/pkghash.c
+++ b/lib/libalpm/pkghash.c
@@ -219,11 +219,15 @@ pmpkghash_t *_alpm_pkghash_add_sorted(pmpkghash_t *hash, pmpkg_t *pkg)
*
* @return the resultant hash
*/
-pmpkghash_t *_alpm_pkghash_remove(pmpkghash_t *hash, pmpkg_t *pkg, pmpkg_t *data)
+pmpkghash_t *_alpm_pkghash_remove(pmpkghash_t *hash, pmpkg_t *pkg, pmpkg_t **data)
{
alpm_list_t *i;
size_t position;
+ if(data) {
+ *data = NULL;
+ }
+
if(pkg == NULL || hash == NULL) {
return(hash);
}
@@ -235,7 +239,6 @@ pmpkghash_t *_alpm_pkghash_remove(pmpkghash_t *hash, pmpkg_t *pkg, pmpkg_t *data
if(info->name_hash == pkg->name_hash &&
strcmp(info->name, pkg->name) == 0) {
-#if 0 /* Actually removing items is not a good idea with linear probing... */
/* remove from list */
/* TODO - refactor with alpm_list_remove */
if(i == hash->list) {
@@ -266,16 +269,34 @@ pmpkghash_t *_alpm_pkghash_remove(pmpkghash_t *hash, pmpkg_t *pkg, pmpkg_t *data
}
/* remove from hash */
- data = info;
- info = NULL;
+ if(data) {
+ *data = info;
+ }
+ hash->hash_table[position] = NULL;
free(i);
- i = NULL;
hash->entries -= 1;
-#endif
- /* fake removal - pkgname can not be blank so 0 hash is impossible */
- info->name_hash = 0;
+ /* potentially move entries following removed entry to keep
+ * open addressing collision resolution working */
+ size_t next_null = (position + 1) % hash->buckets;
+ while(hash->hash_table[next_null] != NULL) {
+ next_null = (next_null + 1) % hash->buckets;
+ }
+
+ position = (position + 1) % hash->buckets;
+
+ while((i = hash->hash_table[position]) != NULL) {
+ info = i->data;
+ size_t new_position = get_hash_position(info->name_hash, hash);
+
+ if(new_position != next_null) {
+ hash->hash_table[new_position] = i;
+ hash->hash_table[position] = NULL;
+ }
+
+ position = (position + 1) % hash->buckets;
+ }
return(hash);
}