1 /***
2 This file is part of eudev, forked from systemd.
3
4 Copyright 2008-2011 Kay Sievers
5
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.
10
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.
15
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/>.
18 ***/
19
20 #include <stdlib.h>
21 #include <stdio.h>
22 #include <stdint.h>
23 #include <string.h>
24 #include <sys/types.h>
25
26 #include "device-nodes.h"
27 #include "utf8.h"
28
whitelisted_char_for_devnode(char c,const char * white)29 int whitelisted_char_for_devnode(char c, const char *white) {
30
31 if ((c >= '0' && c <= '9') ||
32 (c >= 'A' && c <= 'Z') ||
33 (c >= 'a' && c <= 'z') ||
34 strchr("#+-.:=@_", c) != NULL ||
35 (white != NULL && strchr(white, c) != NULL))
36 return 1;
37
38 return 0;
39 }
40
encode_devnode_name(const char * str,char * str_enc,size_t len)41 int encode_devnode_name(const char *str, char *str_enc, size_t len) {
42 size_t i, j;
43
44 if (str == NULL || str_enc == NULL)
45 return -EINVAL;
46
47 for (i = 0, j = 0; str[i] != '\0'; i++) {
48 int seqlen;
49
50 seqlen = utf8_encoded_valid_unichar(&str[i]);
51 if (seqlen > 1) {
52
53 if (len-j < (size_t)seqlen)
54 return -EINVAL;
55
56 memcpy(&str_enc[j], &str[i], seqlen);
57 j += seqlen;
58 i += (seqlen-1);
59
60 } else if (str[i] == '\\' || !whitelisted_char_for_devnode(str[i], NULL)) {
61
62 if (len-j < 4)
63 return -EINVAL;
64
65 sprintf(&str_enc[j], "\\x%02x", (unsigned char) str[i]);
66 j += 4;
67
68 } else {
69 if (len-j < 1)
70 return -EINVAL;
71
72 str_enc[j] = str[i];
73 j++;
74 }
75 }
76
77 if (len-j < 1)
78 return -EINVAL;
79
80 str_enc[j] = '\0';
81 return 0;
82 }
83