]>
git.ipfire.org Git - thirdparty/systemd.git/blob - src/libudev/libudev-util.c
2 This file is part of systemd.
4 Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
29 #include "MurmurHash2.h"
30 #include "device-nodes.h"
31 #include "libudev-private.h"
35 * SECTION:libudev-util
36 * @short_description: utils
38 * Utilities useful when dealing with devices and device node names.
41 /* handle "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */
42 int util_resolve_subsys_kernel(struct udev
*udev
, const char *string
,
43 char *result
, size_t maxsize
, int read_value
)
45 char temp
[UTIL_PATH_SIZE
];
48 struct udev_device
*dev
;
54 strscpy(temp
, sizeof(temp
), string
);
58 sysname
= strchr(subsys
, '/');
62 sysname
= &sysname
[1];
64 attr
= strchr(sysname
, ']');
74 if (read_value
&& attr
== NULL
)
77 dev
= udev_device_new_from_subsystem_sysname(udev
, subsys
, sysname
);
84 val
= udev_device_get_sysattr_value(dev
, attr
);
86 strscpy(result
, maxsize
, val
);
89 log_debug("value '[%s/%s]%s' is '%s'", subsys
, sysname
, attr
, result
);
95 l
= strpcpyl(&s
, maxsize
, udev_device_get_syspath(dev
), NULL
);
97 strpcpyl(&s
, l
, "/", attr
, NULL
);
98 log_debug("path '[%s/%s]%s' is '%s'", subsys
, sysname
, attr
, result
);
100 udev_device_unref(dev
);
104 int util_log_priority(const char *priority
)
109 prio
= strtoul(priority
, &endptr
, 10);
110 if (endptr
[0] == '\0' || isspace(endptr
[0])) {
111 if (prio
>= 0 && prio
<= 7)
117 return log_level_from_string(priority
);
120 size_t util_path_encode(const char *src
, char *dest
, size_t size
)
124 for (i
= 0, j
= 0; src
[i
] != '\0'; i
++) {
130 memcpy(&dest
[j
], "\\x2f", 4);
132 } else if (src
[i
] == '\\') {
137 memcpy(&dest
[j
], "\\x5c", 4);
152 void util_remove_trailing_chars(char *path
, char c
)
159 while (len
> 0 && path
[len
-1] == c
)
163 int util_replace_whitespace(const char *str
, char *to
, size_t len
)
167 /* strip trailing whitespace */
168 len
= strnlen(str
, len
);
169 while (len
&& isspace(str
[len
-1]))
172 /* strip leading whitespace */
174 while ((i
< len
) && isspace(str
[i
]))
179 /* substitute multiple whitespace with a single '_' */
180 if (isspace(str
[i
])) {
181 while (isspace(str
[i
]))
191 /* allow chars in whitelist, plain ascii, hex-escaping and valid utf8 */
192 int util_replace_chars(char *str
, const char *white
)
197 while (str
[i
] != '\0') {
200 if (whitelisted_char_for_devnode(str
[i
], white
)) {
205 /* accept hex encoding */
206 if (str
[i
] == '\\' && str
[i
+1] == 'x') {
211 /* accept valid utf8 */
212 len
= utf8_encoded_valid_unichar(&str
[i
]);
218 /* if space is allowed, replace whitespace with ordinary space */
219 if (isspace(str
[i
]) && white
!= NULL
&& strchr(white
, ' ') != NULL
) {
226 /* everything else is replaced with '_' */
235 * udev_util_encode_string:
236 * @str: input string to be encoded
237 * @str_enc: output string to store the encoded input string
238 * @len: maximum size of the output string, which may be
239 * four times as long as the input string
241 * Encode all potentially unsafe characters of a string to the
242 * corresponding 2 char hex value prefixed by '\x'.
244 * Returns: 0 if the entire string was copied, non-zero otherwise.
246 _public_
int udev_util_encode_string(const char *str
, char *str_enc
, size_t len
)
248 return encode_devnode_name(str
, str_enc
, len
);
251 unsigned int util_string_hash32(const char *str
)
253 return MurmurHash2(str
, strlen(str
), 0);
256 /* get a bunch of bit numbers out of the hash, and set the bits in our bit field */
257 uint64_t util_string_bloom64(const char *str
)
260 unsigned int hash
= util_string_hash32(str
);
262 bits
|= 1LLU << (hash
& 63);
263 bits
|= 1LLU << ((hash
>> 6) & 63);
264 bits
|= 1LLU << ((hash
>> 12) & 63);
265 bits
|= 1LLU << ((hash
>> 18) & 63);