2 * libudev - interface to udev device information
4 * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
32 #include "libudev-private.h"
34 static ssize_t get_sys_link(struct udev *udev, const char *slink, const char *devpath, char *subsystem, size_t size)
36 char path[UTIL_PATH_SIZE];
40 util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
41 util_strlcat(path, devpath, sizeof(path));
42 util_strlcat(path, "/", sizeof(path));
43 util_strlcat(path, slink, sizeof(path));
44 len = readlink(path, path, sizeof(path));
45 if (len < 0 || len >= (ssize_t) sizeof(path))
48 pos = strrchr(path, '/');
52 return util_strlcpy(subsystem, pos, size);
55 ssize_t util_get_sys_subsystem(struct udev *udev, const char *devpath, char *subsystem, size_t size)
57 return get_sys_link(udev, "subsystem", devpath, subsystem, size);
60 ssize_t util_get_sys_driver(struct udev *udev, const char *devpath, char *driver, size_t size)
62 return get_sys_link(udev, "driver", devpath, driver, size);
65 int util_resolve_sys_link(struct udev *udev, char *devpath, size_t size)
67 char link_path[UTIL_PATH_SIZE];
68 char link_target[UTIL_PATH_SIZE];
74 util_strlcpy(link_path, udev_get_sys_path(udev), sizeof(link_path));
75 util_strlcat(link_path, devpath, sizeof(link_path));
76 len = readlink(link_path, link_target, sizeof(link_target));
79 link_target[len] = '\0';
80 dbg(udev, "path link '%s' points to '%s'\n", devpath, link_target);
82 for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++)
84 dbg(udev, "base '%s', tail '%s', back %i\n", devpath, &link_target[back * 3], back);
85 for (i = 0; i <= back; i++) {
86 char *pos = strrchr(devpath, '/');
92 dbg(udev, "after moving back '%s'\n", devpath);
93 util_strlcat(devpath, "/", size);
94 util_strlcat(devpath, &link_target[back * 3], size);
98 struct util_name_entry *util_name_list_add(struct udev *udev, struct list_head *name_list,
99 const char *name, int sort)
101 struct util_name_entry *name_loop;
102 struct util_name_entry *name_new;
104 /* avoid duplicate entries */
105 list_for_each_entry(name_loop, name_list, node) {
106 if (strcmp(name_loop->name, name) == 0) {
107 dbg(udev, "'%s' is already in the list\n", name);
113 list_for_each_entry(name_loop, name_list, node) {
114 if (strcmp(name_loop->name, name) > 0)
119 name_new = malloc(sizeof(struct util_name_entry));
120 if (name_new == NULL)
122 memset(name_new, 0x00, sizeof(struct util_name_entry));
123 name_new->name = strdup(name);
124 if (name_new->name == NULL) {
128 dbg(udev, "adding '%s'\n", name_new->name);
129 list_add_tail(&name_new->node, &name_loop->node);
133 void util_name_list_cleanup(struct udev *udev, struct list_head *name_list)
135 struct util_name_entry *name_loop;
136 struct util_name_entry *name_tmp;
138 list_for_each_entry_safe(name_loop, name_tmp, name_list, node) {
139 list_del(&name_loop->node);
140 free(name_loop->name);
145 int util_log_priority(const char *priority)
150 prio = strtol(priority, &endptr, 10);
151 if (endptr[0] == '\0')
153 if (strncasecmp(priority, "err", 3) == 0)
155 if (strcasecmp(priority, "info") == 0)
157 if (strcasecmp(priority, "debug") == 0)
162 size_t util_path_encode(char *s, size_t len)
168 for (i = 0, j = 0; s[i] != '\0'; i++) {
170 memcpy(&t[j], "\\x2f", 4);
172 } else if (s[i] == '\\') {
173 memcpy(&t[j], "\\x5c", 4);
185 size_t util_path_decode(char *s)
189 for (i = 0, j = 0; s[i] != '\0'; j++) {
190 if (memcmp(&s[i], "\\x2f", 4) == 0) {
193 }else if (memcmp(&s[i], "\\x5c", 4) == 0) {
205 void util_remove_trailing_chars(char *path, char c)
212 while (len > 0 && path[len-1] == c)
216 size_t util_strlcpy(char *dst, const char *src, size_t size)
223 while ((ch = *p++)) {
229 /* If size == 0 there is no space for a final null... */
235 size_t util_strlcat(char *dst, const char *src, size_t size)
242 while (bytes < size && *q) {
247 return (bytes + strlen(src));
249 while ((ch = *p++)) {