+++ /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 <unistd.h>
-#include <errno.h>
-#include <string.h>
-#include <ctype.h>
-
-#include "device-nodes.h"
-#include "libudev.h"
-#include "libudev-private.h"
-#include "utf8.h"
-#include "MurmurHash2.h"
-
-/**
- * SECTION:libudev-util
- * @short_description: utils
- *
- * Utilities useful when dealing with devices and device node names.
- */
-
-/* handle "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */
-int util_resolve_subsys_kernel(struct udev *udev, const char *string,
- char *result, size_t maxsize, int read_value)
-{
- char temp[UTIL_PATH_SIZE];
- char *subsys;
- char *sysname;
- struct udev_device *dev;
- char *attr;
-
- if (string[0] != '[')
- return -1;
-
- strscpy(temp, sizeof(temp), string);
-
- subsys = &temp[1];
-
- sysname = strchr(subsys, '/');
- if (sysname == NULL)
- return -1;
- sysname[0] = '\0';
- sysname = &sysname[1];
-
- attr = strchr(sysname, ']');
- if (attr == NULL)
- return -1;
- attr[0] = '\0';
- attr = &attr[1];
- if (attr[0] == '/')
- attr = &attr[1];
- if (attr[0] == '\0')
- attr = NULL;
-
- if (read_value && attr == NULL)
- return -1;
-
- dev = udev_device_new_from_subsystem_sysname(udev, subsys, sysname);
- if (dev == NULL)
- return -1;
-
- if (read_value) {
- const char *val;
-
- val = udev_device_get_sysattr_value(dev, attr);
- if (val != NULL)
- strscpy(result, maxsize, val);
- else
- result[0] = '\0';
- log_debug("value '[%s/%s]%s' is '%s'", subsys, sysname, attr, result);
- } else {
- size_t l;
- char *s;
-
- s = result;
- l = strpcpyl(&s, maxsize, udev_device_get_syspath(dev), NULL);
- if (attr != NULL)
- strpcpyl(&s, l, "/", attr, NULL);
- log_debug("path '[%s/%s]%s' is '%s'", subsys, sysname, attr, result);
- }
- udev_device_unref(dev);
- return 0;
-}
-
-ssize_t util_get_sys_core_link_value(struct udev *udev, const char *slink, const char *syspath, char *value, size_t size)
-{
- char path[UTIL_PATH_SIZE];
- char target[UTIL_PATH_SIZE];
- ssize_t len;
- const char *pos;
-
- strscpyl(path, sizeof(path), syspath, "/", slink, NULL);
- len = readlink(path, target, sizeof(target));
- if (len <= 0 || len == (ssize_t)sizeof(target))
- return -1;
- target[len] = '\0';
- pos = strrchr(target, '/');
- if (pos == NULL)
- return -1;
- pos = &pos[1];
- return strscpy(value, size, pos);
-}
-
-int util_resolve_sys_link(struct udev *udev, char *syspath, size_t size)
-{
- char link_target[UTIL_PATH_SIZE];
-
- ssize_t len;
- int i;
- int back;
- char *base = NULL;
-
- len = readlink(syspath, link_target, sizeof(link_target));
- if (len <= 0 || len == (ssize_t)sizeof(link_target))
- return -1;
- link_target[len] = '\0';
-
- for (back = 0; startswith(&link_target[back * 3], "../"); back++)
- ;
- for (i = 0; i <= back; i++) {
- base = strrchr(syspath, '/');
- if (base == NULL)
- return -EINVAL;
- base[0] = '\0';
- }
-
- strscpyl(base, size - (base - syspath), "/", &link_target[back * 3], NULL);
- return 0;
-}
-
-int util_log_priority(const char *priority)
-{
- char *endptr;
- int prio;
-
- prio = strtoul(priority, &endptr, 10);
- if (endptr[0] == '\0' || isspace(endptr[0])) {
- if (prio >= 0 && prio <= 7)
- return prio;
- else
- return -ERANGE;
- }
-
- return log_level_from_string(priority);
-}
-
-size_t util_path_encode(const char *src, char *dest, size_t size)
-{
- size_t i, j;
-
- for (i = 0, j = 0; src[i] != '\0'; i++) {
- if (src[i] == '/') {
- if (j+4 >= size) {
- j = 0;
- break;
- }
- memcpy(&dest[j], "\\x2f", 4);
- j += 4;
- } else if (src[i] == '\\') {
- if (j+4 >= size) {
- j = 0;
- break;
- }
- memcpy(&dest[j], "\\x5c", 4);
- j += 4;
- } else {
- if (j+1 >= size) {
- j = 0;
- break;
- }
- dest[j] = src[i];
- j++;
- }
- }
- dest[j] = '\0';
- return j;
-}
-
-void util_remove_trailing_chars(char *path, char c)
-{
- size_t len;
-
- if (path == NULL)
- return;
- len = strlen(path);
- while (len > 0 && path[len-1] == c)
- path[--len] = '\0';
-}
-
-int util_replace_whitespace(const char *str, char *to, size_t len)
-{
- size_t i, j;
-
- /* strip trailing whitespace */
- len = strnlen(str, len);
- while (len && isspace(str[len-1]))
- len--;
-
- /* strip leading whitespace */
- i = 0;
- while (isspace(str[i]) && (i < len))
- i++;
-
- j = 0;
- while (i < len) {
- /* substitute multiple whitespace with a single '_' */
- if (isspace(str[i])) {
- while (isspace(str[i]))
- i++;
- to[j++] = '_';
- }
- to[j++] = str[i++];
- }
- to[j] = '\0';
- return 0;
-}
-
-/* allow chars in whitelist, plain ascii, hex-escaping and valid utf8 */
-int util_replace_chars(char *str, const char *white)
-{
- size_t i = 0;
- int replaced = 0;
-
- while (str[i] != '\0') {
- int len;
-
- if (whitelisted_char_for_devnode(str[i], white)) {
- i++;
- continue;
- }
-
- /* accept hex encoding */
- if (str[i] == '\\' && str[i+1] == 'x') {
- i += 2;
- continue;
- }
-
- /* accept valid utf8 */
- len = utf8_encoded_valid_unichar(&str[i]);
- if (len > 1) {
- i += len;
- continue;
- }
-
- /* if space is allowed, replace whitespace with ordinary space */
- if (isspace(str[i]) && white != NULL && strchr(white, ' ') != NULL) {
- str[i] = ' ';
- i++;
- replaced++;
- continue;
- }
-
- /* everything else is replaced with '_' */
- str[i] = '_';
- i++;
- replaced++;
- }
- return replaced;
-}
-
-/**
- * udev_util_encode_string:
- * @str: input string to be encoded
- * @str_enc: output string to store the encoded input string
- * @len: maximum size of the output string, which may be
- * four times as long as the input string
- *
- * Encode all potentially unsafe characters of a string to the
- * corresponding 2 char hex value prefixed by '\x'.
- *
- * Returns: 0 if the entire string was copied, non-zero otherwise.
- **/
-_public_ int udev_util_encode_string(const char *str, char *str_enc, size_t len)
-{
- return encode_devnode_name(str, str_enc, len);
-}
-
-unsigned int util_string_hash32(const char *str)
-{
- return MurmurHash2(str, strlen(str), 0);
-}
-
-/* get a bunch of bit numbers out of the hash, and set the bits in our bit field */
-uint64_t util_string_bloom64(const char *str)
-{
- uint64_t bits = 0;
- unsigned int hash = util_string_hash32(str);
-
- bits |= 1LLU << (hash & 63);
- bits |= 1LLU << ((hash >> 6) & 63);
- bits |= 1LLU << ((hash >> 12) & 63);
- bits |= 1LLU << ((hash >> 18) & 63);
- return bits;
-}
~ianmdlvl / elogind.git / blobdiff