diff options
author | Lennart Poettering <lennart@poettering.net> | 2010-05-16 18:45:24 +0200 |
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committer | Lennart Poettering <lennart@poettering.net> | 2010-05-16 18:45:24 +0200 |
commit | e99e38bbdcca3fe5956823bdb3d38544ccf93221 (patch) | |
tree | 109871cf2bdcad19105d55f4eea62d5495a8f614 /hashmap.c | |
parent | e9da3678fcfc774b325dc1eaa054d0e00028a1fc (diff) |
build-sys: move source files to subdirectory
Diffstat (limited to 'hashmap.c')
-rw-r--r-- | hashmap.c | 543 |
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; -} |