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[systemd.git] / src / basic / device-nodes.c
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1/***
2 This file is part of 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
4c89c718 20#include <errno.h>
14228c0d 21#include <stdio.h>
4c89c718 22#include <string.h>
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23
24#include "device-nodes.h"
25#include "utf8.h"
26
27int whitelisted_char_for_devnode(char c, const char *white) {
e3bff60a 28
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29 if ((c >= '0' && c <= '9') ||
30 (c >= 'A' && c <= 'Z') ||
31 (c >= 'a' && c <= 'z') ||
32 strchr("#+-.:=@_", c) != NULL ||
33 (white != NULL && strchr(white, c) != NULL))
34 return 1;
e3bff60a 35
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36 return 0;
37}
38
39int encode_devnode_name(const char *str, char *str_enc, size_t len) {
40 size_t i, j;
41
42 if (str == NULL || str_enc == NULL)
5eef597e 43 return -EINVAL;
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44
45 for (i = 0, j = 0; str[i] != '\0'; i++) {
46 int seqlen;
47
48 seqlen = utf8_encoded_valid_unichar(&str[i]);
49 if (seqlen > 1) {
e3bff60a 50
14228c0d 51 if (len-j < (size_t)seqlen)
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52 return -EINVAL;
53
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54 memcpy(&str_enc[j], &str[i], seqlen);
55 j += seqlen;
56 i += (seqlen-1);
e3bff60a 57
14228c0d 58 } else if (str[i] == '\\' || !whitelisted_char_for_devnode(str[i], NULL)) {
e3bff60a 59
14228c0d 60 if (len-j < 4)
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61 return -EINVAL;
62
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63 sprintf(&str_enc[j], "\\x%02x", (unsigned char) str[i]);
64 j += 4;
e3bff60a 65
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66 } else {
67 if (len-j < 1)
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68 return -EINVAL;
69
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70 str_enc[j] = str[i];
71 j++;
72 }
73 }
e3bff60a 74
14228c0d 75 if (len-j < 1)
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76 return -EINVAL;
77
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78 str_enc[j] = '\0';
79 return 0;
14228c0d 80}