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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
036ae95a | 6 | Copyright 2008-2011 Kay Sievers |
8f6ce71f DR |
7 | |
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <stdlib.h> | |
23 | #include <stdio.h> | |
24 | #include <stdint.h> | |
25 | #include <sys/types.h> | |
26 | ||
27 | #include "device-nodes.h" | |
28 | #include "utf8.h" | |
29 | ||
30 | int whitelisted_char_for_devnode(char c, const char *white) { | |
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 | return 0; | |
38 | } | |
39 | ||
40 | int encode_devnode_name(const char *str, char *str_enc, size_t len) { | |
41 | size_t i, j; | |
42 | ||
43 | if (str == NULL || str_enc == NULL) | |
44 | return -1; | |
45 | ||
46 | for (i = 0, j = 0; str[i] != '\0'; i++) { | |
47 | int seqlen; | |
48 | ||
49 | seqlen = utf8_encoded_valid_unichar(&str[i]); | |
50 | if (seqlen > 1) { | |
51 | if (len-j < (size_t)seqlen) | |
52 | goto err; | |
53 | memcpy(&str_enc[j], &str[i], seqlen); | |
54 | j += seqlen; | |
55 | i += (seqlen-1); | |
56 | } else if (str[i] == '\\' || !whitelisted_char_for_devnode(str[i], NULL)) { | |
57 | if (len-j < 4) | |
58 | goto err; | |
59 | sprintf(&str_enc[j], "\\x%02x", (unsigned char) str[i]); | |
60 | j += 4; | |
61 | } else { | |
62 | if (len-j < 1) | |
63 | goto err; | |
64 | str_enc[j] = str[i]; | |
65 | j++; | |
66 | } | |
67 | } | |
68 | if (len-j < 1) | |
69 | goto err; | |
70 | str_enc[j] = '\0'; | |
71 | return 0; | |
72 | err: | |
73 | return -1; | |
74 | } |