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/>.
34 #include "libudev-private.h"
36 static ssize_t get_sys_link(struct udev *udev, const char *slink, const char *syspath, char *subsystem, size_t size)
38 char path[UTIL_PATH_SIZE];
42 util_strlcpy(path, syspath, sizeof(path));
43 util_strlcat(path, "/", sizeof(path));
44 util_strlcat(path, slink, sizeof(path));
45 len = readlink(path, path, sizeof(path));
46 if (len < 0 || len >= (ssize_t) sizeof(path))
49 pos = strrchr(path, '/');
53 return util_strlcpy(subsystem, pos, size);
56 ssize_t util_get_sys_subsystem(struct udev *udev, const char *syspath, char *subsystem, size_t size)
58 return get_sys_link(udev, "subsystem", syspath, subsystem, size);
61 ssize_t util_get_sys_driver(struct udev *udev, const char *syspath, char *driver, size_t size)
63 return get_sys_link(udev, "driver", syspath, driver, size);
66 int util_resolve_sys_link(struct udev *udev, char *syspath, size_t size)
68 char link_target[UTIL_PATH_SIZE];
74 len = readlink(syspath, link_target, sizeof(link_target));
77 link_target[len] = '\0';
78 dbg(udev, "path link '%s' points to '%s'\n", syspath, link_target);
80 for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++)
82 dbg(udev, "base '%s', tail '%s', back %i\n", syspath, &link_target[back * 3], back);
83 for (i = 0; i <= back; i++) {
84 char *pos = strrchr(syspath, '/');
90 dbg(udev, "after moving back '%s'\n", syspath);
91 util_strlcat(syspath, "/", size);
92 util_strlcat(syspath, &link_target[back * 3], size);
96 struct util_name_entry *util_name_list_add(struct udev *udev, struct list_head *name_list,
97 const char *name, const char *value, int sort)
99 struct util_name_entry *name_loop;
100 struct util_name_entry *name_new;
102 /* avoid duplicate entries */
103 list_for_each_entry(name_loop, name_list, node) {
104 if (strcmp(name_loop->name, name) == 0) {
105 dbg(udev, "'%s' is already in the list\n", name);
111 list_for_each_entry(name_loop, name_list, node) {
112 if (strcmp(name_loop->name, name) > 0)
117 name_new = malloc(sizeof(struct util_name_entry));
118 if (name_new == NULL)
120 memset(name_new, 0x00, sizeof(struct util_name_entry));
121 name_new->name = strdup(name);
122 if (name_new->name == NULL) {
127 name_new->value = strdup(value);
128 if (name_new->value == NULL) {
133 dbg(udev, "adding '%s=%s'\n", name_new->name, name_new->value);
134 list_add_tail(&name_new->node, &name_loop->node);
138 void util_name_list_cleanup(struct udev *udev, struct list_head *name_list)
140 struct util_name_entry *name_loop;
141 struct util_name_entry *name_tmp;
143 list_for_each_entry_safe(name_loop, name_tmp, name_list, node) {
144 list_del(&name_loop->node);
145 free(name_loop->name);
146 free(name_loop->value);
151 int util_log_priority(const char *priority)
156 prio = strtol(priority, &endptr, 10);
157 if (endptr[0] == '\0')
159 if (strncasecmp(priority, "err", 3) == 0)
161 if (strcasecmp(priority, "info") == 0)
163 if (strcasecmp(priority, "debug") == 0)
168 size_t util_path_encode(char *s, size_t len)
174 for (i = 0, j = 0; s[i] != '\0'; i++) {
176 memcpy(&t[j], "\\x2f", 4);
178 } else if (s[i] == '\\') {
179 memcpy(&t[j], "\\x5c", 4);
191 size_t util_path_decode(char *s)
195 for (i = 0, j = 0; s[i] != '\0'; j++) {
196 if (memcmp(&s[i], "\\x2f", 4) == 0) {
199 }else if (memcmp(&s[i], "\\x5c", 4) == 0) {
211 void util_remove_trailing_chars(char *path, char c)
218 while (len > 0 && path[len-1] == c)
222 size_t util_strlcpy(char *dst, const char *src, size_t size)
229 while ((ch = *p++)) {
235 /* If size == 0 there is no space for a final null... */
241 size_t util_strlcat(char *dst, const char *src, size_t size)
248 while (bytes < size && *q) {
253 return (bytes + strlen(src));
255 while ((ch = *p++)) {
265 /* count of characters used to encode one unicode char */
266 static int utf8_encoded_expected_len(const char *str)
268 unsigned char c = (unsigned char)str[0];
272 if ((c & 0xe0) == 0xc0)
274 if ((c & 0xf0) == 0xe0)
276 if ((c & 0xf8) == 0xf0)
278 if ((c & 0xfc) == 0xf8)
280 if ((c & 0xfe) == 0xfc)
285 /* decode one unicode char */
286 static int utf8_encoded_to_unichar(const char *str)
292 len = utf8_encoded_expected_len(str);
297 unichar = str[0] & 0x1f;
300 unichar = (int)str[0] & 0x0f;
303 unichar = (int)str[0] & 0x07;
306 unichar = (int)str[0] & 0x03;
309 unichar = (int)str[0] & 0x01;
315 for (i = 1; i < len; i++) {
316 if (((int)str[i] & 0xc0) != 0x80)
319 unichar |= (int)str[i] & 0x3f;
325 /* expected size used to encode one unicode char */
326 static int utf8_unichar_to_encoded_len(int unichar)
332 if (unichar < 0x10000)
334 if (unichar < 0x200000)
336 if (unichar < 0x4000000)
341 /* check if unicode char has a valid numeric range */
342 static int utf8_unichar_valid_range(int unichar)
344 if (unichar > 0x10ffff)
346 if ((unichar & 0xfffff800) == 0xd800)
348 if ((unichar > 0xfdcf) && (unichar < 0xfdf0))
350 if ((unichar & 0xffff) == 0xffff)
355 /* validate one encoded unicode char and return its length */
356 static int utf8_encoded_valid_unichar(const char *str)
362 len = utf8_encoded_expected_len(str);
370 /* check if expected encoded chars are available */
371 for (i = 0; i < len; i++)
372 if ((str[i] & 0x80) != 0x80)
375 unichar = utf8_encoded_to_unichar(str);
377 /* check if encoded length matches encoded value */
378 if (utf8_unichar_to_encoded_len(unichar) != len)
381 /* check if value has valid range */
382 if (!utf8_unichar_valid_range(unichar))
388 /* allow chars in whitelist, plain ascii, hex-escaping and valid utf8 */
389 int util_replace_chars(char *str, const char *white)
394 while (str[i] != '\0') {
397 /* accept whitelist */
398 if (white != NULL && strchr(white, str[i]) != NULL) {
403 /* accept plain ascii char */
404 if ((str[i] >= '0' && str[i] <= '9') ||
405 (str[i] >= 'A' && str[i] <= 'Z') ||
406 (str[i] >= 'a' && str[i] <= 'z')) {
411 /* accept hex encoding */
412 if (str[i] == '\\' && str[i+1] == 'x') {
417 /* accept valid utf8 */
418 len = utf8_encoded_valid_unichar(&str[i]);
424 /* if space is allowed, replace whitespace with ordinary space */
425 if (isspace(str[i]) && strchr(white, ' ') != NULL) {
432 /* everything else is replaced with '_' */