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/*
* libudev - interface to udev device information
*
* Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include "libudev.h"
#include "libudev-private.h"
struct udev_list {
struct udev *udev;
struct list_node node;
struct list_node *list;
char *name;
char *value;
};
static struct udev_list *node_to_entry(struct list_node *node)
{
char *list;
list = (char *)node;
list -= offsetof(struct udev_list, node);
return (struct udev_list *)list;
}
void list_init(struct list_node *list)
{
list->next = list;
list->prev = list;
}
static int list_empty(struct list_node *list)
{
return list->next == list;
}
#if 0
static void list_add(struct list_node *new, struct list_node *list)
{
struct list_node *next = list->next;
next->prev = new;
new->next = next;
new->prev = list;
list->next = new;
}
#endif
static void list_add_to_end(struct list_node *new, struct list_node *list)
{
struct list_node *prev = list->prev;
list->prev = new;
new->next = list;
new->prev = prev;
prev->next = new;
}
static void list_del(struct list_node *entry)
{
struct list_node *prev = entry->prev;
struct list_node *next = entry->next;
next->prev = prev;
prev->next = next;
}
#define list_for_each_entry(pos, list) \
for (pos = node_to_entry((list)->next); \
&pos->node != (list); \
pos = node_to_entry(pos->node.next))
#define list_for_each_entry_safe(pos, tmp, list) \
for (pos = node_to_entry((list)->next), \
tmp = node_to_entry(pos->node.next); \
&pos->node != (list); \
pos = tmp, tmp = node_to_entry(tmp->node.next))
struct udev_list *list_insert_entry(struct udev *udev, struct list_node *list,
const char *name, const char *value, int sort)
{
struct udev_list *list_loop;
struct udev_list *list_new;
/* avoid duplicate entries */
list_for_each_entry(list_loop, list) {
if (strcmp(list_loop->name, name) == 0) {
dbg(udev, "'%s' is already in the list\n", name);
return list_loop;
}
}
if (sort) {
list_for_each_entry(list_loop, list) {
if (strcmp(list_loop->name, name) > 0)
break;
}
}
list_new = malloc(sizeof(struct udev_list));
if (list_new == NULL)
return NULL;
memset(list_new, 0x00, sizeof(struct udev_list));
list_new->udev = udev;
list_new->list = list;
list_new->name = strdup(name);
if (list_new->name == NULL) {
free(list_new);
return NULL;
}
if (value != NULL) {
list_new->value = strdup(value);
if (list_new->value == NULL) {
free(list_new);
return NULL;
}
}
dbg(udev, "adding '%s=%s'\n", list_new->name, list_new->value);
list_add_to_end(&list_new->node, &list_loop->node);
return list_new;
}
void list_move_entry_to_end(struct udev_list *list_entry, struct list_node *list)
{
list_del(&list_entry->node);
list_add_to_end(&list_entry->node, list);
}
void list_cleanup(struct udev *udev, struct list_node *list)
{
struct udev_list *list_loop;
struct udev_list *list_tmp;
list_for_each_entry_safe(list_loop, list_tmp, list) {
list_del(&list_loop->node);
free(list_loop->name);
free(list_loop->value);
free(list_loop);
}
}
struct udev_list *list_get_entry(struct list_node *list)
{
if (list_empty(list))
return NULL;
return node_to_entry(list->next);
}
struct udev_list *udev_list_entry_get_next(struct udev_list *list_entry)
{
struct list_node *next;
next = list_entry->node.next;
/* empty list or no more emtries */
if (next == list_entry->list)
return NULL;
return node_to_entry(next);
}
const char *udev_list_entry_get_name(struct udev_list *list_entry)
{
if (list_entry == NULL)
return NULL;
return list_entry->name;
}
const char *udev_list_entry_get_value(struct udev_list *list_entry)
{
if (list_entry == NULL)
return NULL;
return list_entry->value;
}
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