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f01de965 KS |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2013 Lennart Poettering | |
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 | ||
f01de965 | 20 | #include <stdlib.h> |
f01de965 | 21 | |
b5efdb8a | 22 | #include "alloc-util.h" |
f01de965 | 23 | #include "bus-label.h" |
e4e73a63 | 24 | #include "hexdecoct.h" |
b5efdb8a | 25 | #include "macro.h" |
f01de965 KS |
26 | |
27 | char *bus_label_escape(const char *s) { | |
28 | char *r, *t; | |
29 | const char *f; | |
30 | ||
31 | assert_return(s, NULL); | |
32 | ||
33 | /* Escapes all chars that D-Bus' object path cannot deal | |
34 | * with. Can be reversed with bus_path_unescape(). We special | |
35 | * case the empty string. */ | |
36 | ||
37 | if (*s == 0) | |
38 | return strdup("_"); | |
39 | ||
40 | r = new(char, strlen(s)*3 + 1); | |
41 | if (!r) | |
42 | return NULL; | |
43 | ||
44 | for (f = s, t = r; *f; f++) { | |
45 | ||
46 | /* Escape everything that is not a-zA-Z0-9. We also | |
47 | * escape 0-9 if it's the first character */ | |
48 | ||
49 | if (!(*f >= 'A' && *f <= 'Z') && | |
50 | !(*f >= 'a' && *f <= 'z') && | |
51 | !(f > s && *f >= '0' && *f <= '9')) { | |
52 | *(t++) = '_'; | |
53 | *(t++) = hexchar(*f >> 4); | |
54 | *(t++) = hexchar(*f); | |
55 | } else | |
56 | *(t++) = *f; | |
57 | } | |
58 | ||
59 | *t = 0; | |
60 | ||
61 | return r; | |
62 | } | |
63 | ||
ad922737 | 64 | char *bus_label_unescape_n(const char *f, size_t l) { |
f01de965 | 65 | char *r, *t; |
ad922737 | 66 | size_t i; |
f01de965 KS |
67 | |
68 | assert_return(f, NULL); | |
69 | ||
70 | /* Special case for the empty string */ | |
ad922737 | 71 | if (l == 1 && *f == '_') |
f01de965 KS |
72 | return strdup(""); |
73 | ||
ad922737 | 74 | r = new(char, l + 1); |
f01de965 KS |
75 | if (!r) |
76 | return NULL; | |
77 | ||
ad922737 DH |
78 | for (i = 0, t = r; i < l; ++i) { |
79 | if (f[i] == '_') { | |
f01de965 KS |
80 | int a, b; |
81 | ||
ad922737 DH |
82 | if (l - i < 3 || |
83 | (a = unhexchar(f[i + 1])) < 0 || | |
84 | (b = unhexchar(f[i + 2])) < 0) { | |
f01de965 KS |
85 | /* Invalid escape code, let's take it literal then */ |
86 | *(t++) = '_'; | |
87 | } else { | |
88 | *(t++) = (char) ((a << 4) | b); | |
ad922737 | 89 | i += 2; |
f01de965 KS |
90 | } |
91 | } else | |
ad922737 | 92 | *(t++) = f[i]; |
f01de965 KS |
93 | } |
94 | ||
95 | *t = 0; | |
96 | ||
97 | return r; | |
98 | } |