+++ /dev/null
-/***
- This file is part of systemd.
-
- Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 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
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <stdlib.h>
-#include <stddef.h>
-#include <errno.h>
-#include <string.h>
-
-#include "libudev-private.h"
-
-/**
- * SECTION:libudev-list
- * @short_description: list operation
- *
- * Libudev list operations.
- */
-
-/**
- * udev_list_entry:
- *
- * Opaque object representing one entry in a list. An entry contains
- * contains a name, and optionally a value.
- */
-struct udev_list_entry {
- struct udev_list_node node;
- struct udev_list *list;
- char *name;
- char *value;
- int num;
-};
-
-/* the list's head points to itself if empty */
-void udev_list_node_init(struct udev_list_node *list)
-{
- list->next = list;
- list->prev = list;
-}
-
-int udev_list_node_is_empty(struct udev_list_node *list)
-{
- return list->next == list;
-}
-
-static void udev_list_node_insert_between(struct udev_list_node *new,
- struct udev_list_node *prev,
- struct udev_list_node *next)
-{
- next->prev = new;
- new->next = next;
- new->prev = prev;
- prev->next = new;
-}
-
-void udev_list_node_append(struct udev_list_node *new, struct udev_list_node *list)
-{
- udev_list_node_insert_between(new, list->prev, list);
-}
-
-void udev_list_node_remove(struct udev_list_node *entry)
-{
- struct udev_list_node *prev = entry->prev;
- struct udev_list_node *next = entry->next;
-
- next->prev = prev;
- prev->next = next;
-
- entry->prev = NULL;
- entry->next = NULL;
-}
-
-/* return list entry which embeds this node */
-static inline struct udev_list_entry *list_node_to_entry(struct udev_list_node *node)
-{
- return container_of(node, struct udev_list_entry, node);
-}
-
-void udev_list_init(struct udev *udev, struct udev_list *list, bool unique)
-{
- memzero(list, sizeof(struct udev_list));
- list->udev = udev;
- list->unique = unique;
- udev_list_node_init(&list->node);
-}
-
-/* insert entry into a list as the last element */
-static void udev_list_entry_append(struct udev_list_entry *new, struct udev_list *list)
-{
- /* inserting before the list head make the node the last node in the list */
- udev_list_node_insert_between(&new->node, list->node.prev, &list->node);
- new->list = list;
-}
-
-/* insert entry into a list, before a given existing entry */
-static void udev_list_entry_insert_before(struct udev_list_entry *new, struct udev_list_entry *entry)
-{
- udev_list_node_insert_between(&new->node, entry->node.prev, &entry->node);
- new->list = entry->list;
-}
-
-/* binary search in sorted array */
-static int list_search(struct udev_list *list, const char *name)
-{
- unsigned int first, last;
-
- first = 0;
- last = list->entries_cur;
- while (first < last) {
- unsigned int i;
- int cmp;
-
- i = (first + last)/2;
- cmp = strcmp(name, list->entries[i]->name);
- if (cmp < 0)
- last = i;
- else if (cmp > 0)
- first = i+1;
- else
- return i;
- }
-
- /* not found, return negative insertion-index+1 */
- return -(first+1);
-}
-
-struct udev_list_entry *udev_list_entry_add(struct udev_list *list, const char *name, const char *value)
-{
- struct udev_list_entry *entry;
- int i = 0;
-
- if (list->unique) {
- /* lookup existing name or insertion-index */
- i = list_search(list, name);
- if (i >= 0) {
- entry = list->entries[i];
-
- free(entry->value);
- if (value == NULL) {
- entry->value = NULL;
- return entry;
- }
- entry->value = strdup(value);
- if (entry->value == NULL)
- return NULL;
- return entry;
- }
- }
-
- /* add new name */
- entry = new0(struct udev_list_entry, 1);
- if (entry == NULL)
- return NULL;
- entry->name = strdup(name);
- if (entry->name == NULL) {
- free(entry);
- return NULL;
- }
- if (value != NULL) {
- entry->value = strdup(value);
- if (entry->value == NULL) {
- free(entry->name);
- free(entry);
- return NULL;
- }
- }
-
- if (list->unique) {
- /* allocate or enlarge sorted array if needed */
- if (list->entries_cur >= list->entries_max) {
- struct udev_list_entry **entries;
- unsigned int add;
-
- add = list->entries_max;
- if (add < 1)
- add = 64;
- entries = realloc(list->entries, (list->entries_max + add) * sizeof(struct udev_list_entry *));
- if (entries == NULL) {
- free(entry->name);
- free(entry->value);
- free(entry);
- return NULL;
- }
- list->entries = entries;
- list->entries_max += add;
- }
-
- /* the negative i returned the insertion index */
- i = (-i)-1;
-
- /* insert into sorted list */
- if ((unsigned int)i < list->entries_cur)
- udev_list_entry_insert_before(entry, list->entries[i]);
- else
- udev_list_entry_append(entry, list);
-
- /* insert into sorted array */
- memmove(&list->entries[i+1], &list->entries[i],
- (list->entries_cur - i) * sizeof(struct udev_list_entry *));
- list->entries[i] = entry;
- list->entries_cur++;
- } else {
- udev_list_entry_append(entry, list);
- }
-
- return entry;
-}
-
-void udev_list_entry_delete(struct udev_list_entry *entry)
-{
- if (entry->list->entries != NULL) {
- int i;
- struct udev_list *list = entry->list;
-
- /* remove entry from sorted array */
- i = list_search(list, entry->name);
- if (i >= 0) {
- memmove(&list->entries[i], &list->entries[i+1],
- ((list->entries_cur-1) - i) * sizeof(struct udev_list_entry *));
- list->entries_cur--;
- }
- }
-
- udev_list_node_remove(&entry->node);
- free(entry->name);
- free(entry->value);
- free(entry);
-}
-
-void udev_list_cleanup(struct udev_list *list)
-{
- struct udev_list_entry *entry_loop;
- struct udev_list_entry *entry_tmp;
-
- free(list->entries);
- list->entries = NULL;
- list->entries_cur = 0;
- list->entries_max = 0;
- udev_list_entry_foreach_safe(entry_loop, entry_tmp, udev_list_get_entry(list))
- udev_list_entry_delete(entry_loop);
-}
-
-struct udev_list_entry *udev_list_get_entry(struct udev_list *list)
-{
- if (udev_list_node_is_empty(&list->node))
- return NULL;
- return list_node_to_entry(list->node.next);
-}
-
-/**
- * udev_list_entry_get_next:
- * @list_entry: current entry
- *
- * Get the next entry from the list.
- *
- * Returns: udev_list_entry, #NULL if no more entries are available.
- */
-_public_ struct udev_list_entry *udev_list_entry_get_next(struct udev_list_entry *list_entry)
-{
- struct udev_list_node *next;
-
- if (list_entry == NULL)
- return NULL;
- next = list_entry->node.next;
- /* empty list or no more entries */
- if (next == &list_entry->list->node)
- return NULL;
- return list_node_to_entry(next);
-}
-
-/**
- * udev_list_entry_get_by_name:
- * @list_entry: current entry
- * @name: name string to match
- *
- * Lookup an entry in the list with a certain name.
- *
- * Returns: udev_list_entry, #NULL if no matching entry is found.
- */
-_public_ struct udev_list_entry *udev_list_entry_get_by_name(struct udev_list_entry *list_entry, const char *name)
-{
- int i;
-
- if (list_entry == NULL)
- return NULL;
-
- if (!list_entry->list->unique)
- return NULL;
-
- i = list_search(list_entry->list, name);
- if (i < 0)
- return NULL;
- return list_entry->list->entries[i];
-}
-
-/**
- * udev_list_entry_get_name:
- * @list_entry: current entry
- *
- * Get the name of a list entry.
- *
- * Returns: the name string of this entry.
- */
-_public_ const char *udev_list_entry_get_name(struct udev_list_entry *list_entry)
-{
- if (list_entry == NULL)
- return NULL;
- return list_entry->name;
-}
-
-/**
- * udev_list_entry_get_value:
- * @list_entry: current entry
- *
- * Get the value of list entry.
- *
- * Returns: the value string of this entry.
- */
-_public_ const char *udev_list_entry_get_value(struct udev_list_entry *list_entry)
-{
- if (list_entry == NULL)
- return NULL;
- return list_entry->value;
-}
-
-int udev_list_entry_get_num(struct udev_list_entry *list_entry)
-{
- if (list_entry == NULL)
- return -EINVAL;
- return list_entry->num;
-}
-
-void udev_list_entry_set_num(struct udev_list_entry *list_entry, int num)
-{
- if (list_entry == NULL)
- return;
- list_entry->num = num;
-}
~ianmdlvl / elogind.git / blobdiff