+++ /dev/null
-/*
- * libudev - interface to udev device information
- *
- * Copyright (C) 2008-2009 Kay Sievers <kay.sievers@vrfy.org>
- *
- * This library 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.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <stddef.h>
-#include <unistd.h>
-#include <errno.h>
-#include <string.h>
-#include <dirent.h>
-#include <ctype.h>
-#include <fcntl.h>
-#include <time.h>
-#include <sys/stat.h>
-
-#include "libudev.h"
-#include "libudev-private.h"
-
-static ssize_t get_sys_link(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;
-
- util_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];
- dbg(udev, "resolved link to: '%s'\n", pos);
- return util_strscpy(value, size, pos);
-}
-
-ssize_t util_get_sys_subsystem(struct udev *udev, const char *syspath, char *subsystem, size_t size)
-{
- return get_sys_link(udev, "subsystem", syspath, subsystem, size);
-}
-
-ssize_t util_get_sys_driver(struct udev *udev, const char *syspath, char *driver, size_t size)
-{
- return get_sys_link(udev, "driver", syspath, driver, size);
-}
-
-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;
-
- len = readlink(syspath, link_target, sizeof(link_target));
- if (len <= 0 || len == (ssize_t)sizeof(link_target))
- return -1;
- link_target[len] = '\0';
- dbg(udev, "path link '%s' points to '%s'\n", syspath, link_target);
-
- for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++)
- ;
- dbg(udev, "base '%s', tail '%s', back %i\n", syspath, &link_target[back * 3], back);
- for (i = 0; i <= back; i++) {
- base = strrchr(syspath, '/');
- if (base == NULL)
- return -1;
- base[0] = '\0';
- }
- dbg(udev, "after moving back '%s'\n", syspath);
- util_strscpyl(base, size - (base - syspath), "/", &link_target[back * 3], NULL);
- return 0;
-}
-
-int util_log_priority(const char *priority)
-{
- char *endptr;
- int prio;
-
- prio = strtol(priority, &endptr, 10);
- if (endptr[0] == '\0' || isspace(endptr[0]))
- return prio;
- if (strncmp(priority, "err", 3) == 0)
- return LOG_ERR;
- if (strncmp(priority, "info", 4) == 0)
- return LOG_INFO;
- if (strncmp(priority, "debug", 5) == 0)
- return LOG_DEBUG;
- return 0;
-}
-
-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;
-}
-
-size_t util_path_decode(char *s)
-{
- size_t i, j;
-
- for (i = 0, j = 0; s[i] != '\0'; j++) {
- if (memcmp(&s[i], "\\x2f", 4) == 0) {
- s[j] = '/';
- i += 4;
- } else if (memcmp(&s[i], "\\x5c", 4) == 0) {
- s[j] = '\\';
- i += 4;
- } else {
- s[j] = s[i];
- i++;
- }
- }
- s[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';
-}
-
-/*
- * Concatenates strings. In any case, terminates in _all_ cases with '\0'
- * and moves the @dest pointer forward to the added '\0'. Returns the
- * remaining size, and 0 if the string was truncated.
- */
-size_t util_strpcpy(char **dest, size_t size, const char *src)
-{
- size_t len;
-
- len = strlen(src);
- if (len >= size) {
- if (size > 1)
- *dest = mempcpy(*dest, src, size-1);
- size = 0;
- *dest[0] = '\0';
- } else {
- if (len > 0) {
- *dest = mempcpy(*dest, src, len);
- size -= len;
- }
- *dest[0] = '\0';
- }
- return size;
-}
-
-/* concatenates list of strings, moves dest forward */
-size_t util_strpcpyl(char **dest, size_t size, const char *src, ...)
-{
- va_list va;
-
- va_start(va, src);
- do {
- size = util_strpcpy(dest, size, src);
- src = va_arg(va, char *);
- } while (src != NULL);
- va_end(va);
-
- return size;
-}
-
-/* copies string */
-size_t util_strscpy(char *dest, size_t size, const char *src)
-{
- char *s;
-
- s = dest;
- return util_strpcpy(&s, size, src);
-}
-
-/* concatenates list of strings */
-size_t util_strscpyl(char *dest, size_t size, const char *src, ...)
-{
- va_list va;
- char *s;
-
- va_start(va, src);
- s = dest;
- do {
- size = util_strpcpy(&s, size, src);
- src = va_arg(va, char *);
- } while (src != NULL);
- va_end(va);
-
- return size;
-}
-
-/* count of characters used to encode one unicode char */
-static int utf8_encoded_expected_len(const char *str)
-{
- unsigned char c = (unsigned char)str[0];
-
- if (c < 0x80)
- return 1;
- if ((c & 0xe0) == 0xc0)
- return 2;
- if ((c & 0xf0) == 0xe0)
- return 3;
- if ((c & 0xf8) == 0xf0)
- return 4;
- if ((c & 0xfc) == 0xf8)
- return 5;
- if ((c & 0xfe) == 0xfc)
- return 6;
- return 0;
-}
-
-/* decode one unicode char */
-static int utf8_encoded_to_unichar(const char *str)
-{
- int unichar;
- int len;
- int i;
-
- len = utf8_encoded_expected_len(str);
- switch (len) {
- case 1:
- return (int)str[0];
- case 2:
- unichar = str[0] & 0x1f;
- break;
- case 3:
- unichar = (int)str[0] & 0x0f;
- break;
- case 4:
- unichar = (int)str[0] & 0x07;
- break;
- case 5:
- unichar = (int)str[0] & 0x03;
- break;
- case 6:
- unichar = (int)str[0] & 0x01;
- break;
- default:
- return -1;
- }
-
- for (i = 1; i < len; i++) {
- if (((int)str[i] & 0xc0) != 0x80)
- return -1;
- unichar <<= 6;
- unichar |= (int)str[i] & 0x3f;
- }
-
- return unichar;
-}
-
-/* expected size used to encode one unicode char */
-static int utf8_unichar_to_encoded_len(int unichar)
-{
- if (unichar < 0x80)
- return 1;
- if (unichar < 0x800)
- return 2;
- if (unichar < 0x10000)
- return 3;
- if (unichar < 0x200000)
- return 4;
- if (unichar < 0x4000000)
- return 5;
- return 6;
-}
-
-/* check if unicode char has a valid numeric range */
-static int utf8_unichar_valid_range(int unichar)
-{
- if (unichar > 0x10ffff)
- return 0;
- if ((unichar & 0xfffff800) == 0xd800)
- return 0;
- if ((unichar > 0xfdcf) && (unichar < 0xfdf0))
- return 0;
- if ((unichar & 0xffff) == 0xffff)
- return 0;
- return 1;
-}
-
-/* validate one encoded unicode char and return its length */
-static int utf8_encoded_valid_unichar(const char *str)
-{
- int len;
- int unichar;
- int i;
-
- len = utf8_encoded_expected_len(str);
- if (len == 0)
- return -1;
-
- /* ascii is valid */
- if (len == 1)
- return 1;
-
- /* check if expected encoded chars are available */
- for (i = 0; i < len; i++)
- if ((str[i] & 0x80) != 0x80)
- return -1;
-
- unichar = utf8_encoded_to_unichar(str);
-
- /* check if encoded length matches encoded value */
- if (utf8_unichar_to_encoded_len(unichar) != len)
- return -1;
-
- /* check if value has valid range */
- if (!utf8_unichar_valid_range(unichar))
- return -1;
-
- return len;
-}
-
-int udev_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;
-}
-
-static int is_whitelisted(char c, const char *white)
-{
- if ((c >= '0' && c <= '9') ||
- (c >= 'A' && c <= 'Z') ||
- (c >= 'a' && c <= 'z') ||
- strchr("#+-.:=@_", c) != NULL ||
- (white != NULL && strchr(white, c) != NULL))
- return 1;
- return 0;
-}
-
-/* allow chars in whitelist, plain ascii, hex-escaping and valid utf8 */
-int udev_util_replace_chars(char *str, const char *white)
-{
- size_t i = 0;
- int replaced = 0;
-
- while (str[i] != '\0') {
- int len;
-
- if (is_whitelisted(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;
-}
-
-/**
- * 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 hex value prefixed by '\x'.
- *
- * Returns: 0 if the entire string was copied, non-zero otherwise.
- **/
-int udev_util_encode_string(const char *str, char *str_enc, size_t len)
-{
- size_t i, j;
-
- if (str == NULL || str_enc == NULL)
- return -1;
-
- for (i = 0, j = 0; str[i] != '\0'; i++) {
- int seqlen;
-
- seqlen = utf8_encoded_valid_unichar(&str[i]);
- if (seqlen > 1) {
- if (len-j < (size_t)seqlen)
- goto err;
- memcpy(&str_enc[j], &str[i], seqlen);
- j += seqlen;
- i += (seqlen-1);
- } else if (str[i] == '\\' || !is_whitelisted(str[i], NULL)) {
- if (len-j < 4)
- goto err;
- sprintf(&str_enc[j], "\\x%02x", (unsigned char) str[i]);
- j += 4;
- } else {
- if (len-j < 1)
- goto err;
- str_enc[j] = str[i];
- j++;
- }
- }
- if (len-j < 1)
- goto err;
- str_enc[j] = '\0';
- return 0;
-err:
- return -1;
-}
-
-/*
- * http://sites.google.com/site/murmurhash/
- *
- * All code is released to the public domain. For business purposes,
- * Murmurhash is under the MIT license.
- *
- */
-static unsigned int murmur_hash2(const char *key, int len, unsigned int seed)
-{
- /*
- * 'm' and 'r' are mixing constants generated offline.
- * They're not really 'magic', they just happen to work well.
- */
- const unsigned int m = 0x5bd1e995;
- const int r = 24;
-
- /* initialize the hash to a 'random' value */
- unsigned int h = seed ^ len;
-
- /* mix 4 bytes at a time into the hash */
- const unsigned char * data = (const unsigned char *)key;
-
- while(len >= 4) {
- unsigned int k = *(unsigned int *)data;
-
- k *= m;
- k ^= k >> r;
- k *= m;
- h *= m;
- h ^= k;
-
- data += 4;
- len -= 4;
- }
-
- /* handle the last few bytes of the input array */
- switch(len) {
- case 3:
- h ^= data[2] << 16;
- case 2:
- h ^= data[1] << 8;
- case 1:
- h ^= data[0];
- h *= m;
- };
-
- /* do a few final mixes of the hash to ensure the last few bytes are well-incorporated */
- h ^= h >> 13;
- h *= m;
- h ^= h >> 15;
-
- return h;
-}
-
-unsigned int util_string_hash32(const char *str)
-{
- return murmur_hash2(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;
-}
-
-#define USEC_PER_SEC 1000000ULL
-#define NSEC_PER_USEC 1000ULL
-unsigned long long now_usec(void)
-{
- struct timespec ts;
-
- if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
- return 0;
- return (unsigned long long) ts.tv_sec * USEC_PER_SEC +
- (unsigned long long) ts.tv_nsec / NSEC_PER_USEC;
-}
~ianmdlvl / elogind.git / blobdiff