mirror of
https://github.com/AuxXxilium/eudev.git
synced 2024-12-22 15:03:34 +07:00
544 lines
12 KiB
C
544 lines
12 KiB
C
/*-*- 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;
|
|
}
|