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-rw-r--r--hashmap.c543
1 files changed, 0 insertions, 543 deletions
diff --git a/hashmap.c b/hashmap.c
deleted file mode 100644
index 5a993b6e47..0000000000
--- a/hashmap.c
+++ /dev/null
@@ -1,543 +0,0 @@
-/*-*- Mode: C; c-basic-offset: 8 -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-#include <errno.h>
-
-#include "util.h"
-#include "hashmap.h"
-#include "macro.h"
-
-#define NBUCKETS 127
-
-struct hashmap_entry {
- const void *key;
- void *value;
- struct hashmap_entry *bucket_next, *bucket_previous;
- struct hashmap_entry *iterate_next, *iterate_previous;
-};
-
-struct Hashmap {
- hash_func_t hash_func;
- compare_func_t compare_func;
-
- struct hashmap_entry *iterate_list_head, *iterate_list_tail;
- unsigned n_entries;
-};
-
-#define BY_HASH(h) ((struct hashmap_entry**) ((uint8_t*) (h) + ALIGN(sizeof(Hashmap))))
-
-unsigned string_hash_func(const void *p) {
- unsigned hash = 0;
- const char *c;
-
- for (c = p; *c; c++)
- hash = 31 * hash + (unsigned) *c;
-
- return hash;
-}
-
-int string_compare_func(const void *a, const void *b) {
- return strcmp(a, b);
-}
-
-unsigned trivial_hash_func(const void *p) {
- return PTR_TO_UINT(p);
-}
-
-int trivial_compare_func(const void *a, const void *b) {
- return a < b ? -1 : (a > b ? 1 : 0);
-}
-
-Hashmap *hashmap_new(hash_func_t hash_func, compare_func_t compare_func) {
- Hashmap *h;
-
- if (!(h = malloc0(ALIGN(sizeof(Hashmap)) + NBUCKETS * ALIGN(sizeof(struct hashmap_entry*)))))
- return NULL;
-
- h->hash_func = hash_func ? hash_func : trivial_hash_func;
- h->compare_func = compare_func ? compare_func : trivial_compare_func;
-
- h->n_entries = 0;
- h->iterate_list_head = h->iterate_list_tail = NULL;
-
- return h;
-}
-
-int hashmap_ensure_allocated(Hashmap **h, hash_func_t hash_func, compare_func_t compare_func) {
- assert(h);
-
- if (*h)
- return 0;
-
- if (!(*h = hashmap_new(hash_func, compare_func)))
- return -ENOMEM;
-
- return 0;
-}
-
-static void link_entry(Hashmap *h, struct hashmap_entry *e, unsigned hash) {
- assert(h);
- assert(e);
-
- /* Insert into hash table */
- e->bucket_next = BY_HASH(h)[hash];
- e->bucket_previous = NULL;
- if (BY_HASH(h)[hash])
- BY_HASH(h)[hash]->bucket_previous = e;
- BY_HASH(h)[hash] = e;
-
- /* Insert into iteration list */
- e->iterate_previous = h->iterate_list_tail;
- e->iterate_next = NULL;
- if (h->iterate_list_tail) {
- assert(h->iterate_list_head);
- h->iterate_list_tail->iterate_next = e;
- } else {
- assert(!h->iterate_list_head);
- h->iterate_list_head = e;
- }
- h->iterate_list_tail = e;
-
- h->n_entries++;
- assert(h->n_entries >= 1);
-}
-
-static void unlink_entry(Hashmap *h, struct hashmap_entry *e, unsigned hash) {
- assert(h);
- assert(e);
-
- /* Remove from iteration list */
- if (e->iterate_next)
- e->iterate_next->iterate_previous = e->iterate_previous;
- else
- h->iterate_list_tail = e->iterate_previous;
-
- if (e->iterate_previous)
- e->iterate_previous->iterate_next = e->iterate_next;
- else
- h->iterate_list_head = e->iterate_next;
-
- /* Remove from hash table bucket list */
- if (e->bucket_next)
- e->bucket_next->bucket_previous = e->bucket_previous;
-
- if (e->bucket_previous)
- e->bucket_previous->bucket_next = e->bucket_next;
- else
- BY_HASH(h)[hash] = e->bucket_next;
-
- assert(h->n_entries >= 1);
- h->n_entries--;
-}
-
-static void remove_entry(Hashmap *h, struct hashmap_entry *e) {
- unsigned hash;
-
- assert(h);
- assert(e);
-
- hash = h->hash_func(e->key) % NBUCKETS;
-
- unlink_entry(h, e, hash);
- free(e);
-}
-
-void hashmap_free(Hashmap*h) {
-
- if (!h)
- return;
-
- hashmap_clear(h);
-
- free(h);
-}
-
-void hashmap_clear(Hashmap *h) {
- if (!h)
- return;
-
- while (h->iterate_list_head)
- remove_entry(h, h->iterate_list_head);
-}
-
-static struct hashmap_entry *hash_scan(Hashmap *h, unsigned hash, const void *key) {
- struct hashmap_entry *e;
- assert(h);
- assert(hash < NBUCKETS);
-
- for (e = BY_HASH(h)[hash]; e; e = e->bucket_next)
- if (h->compare_func(e->key, key) == 0)
- return e;
-
- return NULL;
-}
-
-int hashmap_put(Hashmap *h, const void *key, void *value) {
- struct hashmap_entry *e;
- unsigned hash;
-
- assert(h);
-
- hash = h->hash_func(key) % NBUCKETS;
-
- if ((e = hash_scan(h, hash, key))) {
-
- if (e->value == value)
- return 0;
-
- return -EEXIST;
- }
-
- if (!(e = new(struct hashmap_entry, 1)))
- return -ENOMEM;
-
- e->key = key;
- e->value = value;
-
- link_entry(h, e, hash);
-
- return 1;
-}
-
-int hashmap_replace(Hashmap *h, const void *key, void *value) {
- struct hashmap_entry *e;
- unsigned hash;
-
- assert(h);
-
- hash = h->hash_func(key) % NBUCKETS;
-
- if ((e = hash_scan(h, hash, key))) {
- e->key = key;
- e->value = value;
- return 0;
- }
-
- return hashmap_put(h, key, value);
-}
-
-void* hashmap_get(Hashmap *h, const void *key) {
- unsigned hash;
- struct hashmap_entry *e;
-
- if (!h)
- return NULL;
-
- hash = h->hash_func(key) % NBUCKETS;
-
- if (!(e = hash_scan(h, hash, key)))
- return NULL;
-
- return e->value;
-}
-
-void* hashmap_remove(Hashmap *h, const void *key) {
- struct hashmap_entry *e;
- unsigned hash;
- void *data;
-
- if (!h)
- return NULL;
-
- hash = h->hash_func(key) % NBUCKETS;
-
- if (!(e = hash_scan(h, hash, key)))
- return NULL;
-
- data = e->value;
- remove_entry(h, e);
-
- return data;
-}
-
-int hashmap_remove_and_put(Hashmap *h, const void *old_key, const void *new_key, void *value) {
- struct hashmap_entry *e;
- unsigned old_hash, new_hash;
-
- if (!h)
- return -ENOENT;
-
- old_hash = h->hash_func(old_key) % NBUCKETS;
- if (!(e = hash_scan(h, old_hash, old_key)))
- return -ENOENT;
-
- new_hash = h->hash_func(new_key) % NBUCKETS;
- if (hash_scan(h, new_hash, new_key))
- return -EEXIST;
-
- unlink_entry(h, e, old_hash);
-
- e->key = new_key;
- e->value = value;
-
- link_entry(h, e, new_hash);
-
- return 0;
-}
-
-void* hashmap_remove_value(Hashmap *h, const void *key, void *value) {
- struct hashmap_entry *e;
- unsigned hash;
-
- if (!h)
- return NULL;
-
- hash = h->hash_func(key) % NBUCKETS;
-
- if (!(e = hash_scan(h, hash, key)))
- return NULL;
-
- if (e->value != value)
- return NULL;
-
- remove_entry(h, e);
-
- return value;
-}
-
-void *hashmap_iterate(Hashmap *h, Iterator *i, const void **key) {
- struct hashmap_entry *e;
-
- assert(i);
-
- if (!h)
- goto at_end;
-
- if (*i == ITERATOR_LAST)
- goto at_end;
-
- if (*i == ITERATOR_FIRST && !h->iterate_list_head)
- goto at_end;
-
- e = *i == ITERATOR_FIRST ? h->iterate_list_head : (struct hashmap_entry*) *i;
-
- if (e->iterate_next)
- *i = (Iterator) e->iterate_next;
- else
- *i = ITERATOR_LAST;
-
- if (key)
- *key = e->key;
-
- return e->value;
-
-at_end:
- *i = ITERATOR_LAST;
-
- if (key)
- *key = NULL;
-
- return NULL;
-}
-
-void *hashmap_iterate_backwards(Hashmap *h, Iterator *i, const void **key) {
- struct hashmap_entry *e;
-
- assert(i);
-
- if (!h)
- goto at_beginning;
-
- if (*i == ITERATOR_FIRST)
- goto at_beginning;
-
- if (*i == ITERATOR_LAST && !h->iterate_list_tail)
- goto at_beginning;
-
- e = *i == ITERATOR_LAST ? h->iterate_list_tail : (struct hashmap_entry*) *i;
-
- if (e->iterate_previous)
- *i = (Iterator) e->iterate_previous;
- else
- *i = ITERATOR_FIRST;
-
- if (key)
- *key = e->key;
-
- return e->value;
-
-at_beginning:
- *i = ITERATOR_FIRST;
-
- if (key)
- *key = NULL;
-
- return NULL;
-}
-
-void *hashmap_iterate_skip(Hashmap *h, const void *key, Iterator *i) {
- unsigned hash;
- struct hashmap_entry *e;
-
- if (!h)
- return NULL;
-
- hash = h->hash_func(key) % NBUCKETS;
-
- if (!(e = hash_scan(h, hash, key)))
- return NULL;
-
- *i = (Iterator) e;
-
- return e->value;
-}
-
-void* hashmap_first(Hashmap *h) {
-
- if (!h)
- return NULL;
-
- if (!h->iterate_list_head)
- return NULL;
-
- return h->iterate_list_head->value;
-}
-
-void* hashmap_last(Hashmap *h) {
-
- if (!h)
- return NULL;
-
- if (!h->iterate_list_tail)
- return NULL;
-
- return h->iterate_list_tail->value;
-}
-
-void* hashmap_steal_first(Hashmap *h) {
- void *data;
-
- if (!h)
- return NULL;
-
- if (!h->iterate_list_head)
- return NULL;
-
- data = h->iterate_list_head->value;
- remove_entry(h, h->iterate_list_head);
-
- return data;
-}
-
-unsigned hashmap_size(Hashmap *h) {
-
- if (!h)
- return 0;
-
- return h->n_entries;
-}
-
-bool hashmap_isempty(Hashmap *h) {
-
- if (!h)
- return true;
-
- return h->n_entries == 0;
-}
-
-int hashmap_merge(Hashmap *h, Hashmap *other) {
- struct hashmap_entry *e;
-
- assert(h);
-
- if (!other)
- return 0;
-
- for (e = other->iterate_list_head; e; e = e->iterate_next) {
- int r;
-
- if ((r = hashmap_put(h, e->key, e->value)) < 0)
- if (r != -EEXIST)
- return r;
- }
-
- return 0;
-}
-
-void hashmap_move(Hashmap *h, Hashmap *other) {
- struct hashmap_entry *e, *n;
-
- assert(h);
-
- /* The same as hashmap_merge(), but every new item from other
- * is moved to h. This function is guaranteed to succeed. */
-
- if (!other)
- return;
-
- for (e = other->iterate_list_head; e; e = n) {
- unsigned h_hash, other_hash;
-
- n = e->iterate_next;
-
- h_hash = h->hash_func(e->key) % NBUCKETS;
-
- if (hash_scan(h, h_hash, e->key))
- continue;
-
- other_hash = other->hash_func(e->key) % NBUCKETS;
-
- unlink_entry(other, e, other_hash);
- link_entry(h, e, h_hash);
- }
-}
-
-int hashmap_move_one(Hashmap *h, Hashmap *other, const void *key) {
- unsigned h_hash, other_hash;
- struct hashmap_entry *e;
-
- if (!other)
- return 0;
-
- assert(h);
-
- h_hash = h->hash_func(key) % NBUCKETS;
- if (hash_scan(h, h_hash, key))
- return -EEXIST;
-
- other_hash = other->hash_func(key) % NBUCKETS;
- if (!(e = hash_scan(other, other_hash, key)))
- return -ENOENT;
-
- unlink_entry(other, e, other_hash);
- link_entry(h, e, h_hash);
-
- return 0;
-}
-
-Hashmap *hashmap_copy(Hashmap *h) {
- Hashmap *copy;
-
- assert(h);
-
- if (!(copy = hashmap_new(h->hash_func, h->compare_func)))
- return NULL;
-
- if (hashmap_merge(copy, h) < 0) {
- hashmap_free(copy);
- return NULL;
- }
-
- return copy;
-}
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