1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 Copyright 2013 Lennart Poettering
8 #include "alloc-util.h"
10 #include "hexdecoct.h"
13 char *bus_label_escape(const char *s) {
17 assert_return(s, NULL);
19 /* Escapes all chars that D-Bus' object path cannot deal
20 * with. Can be reversed with bus_path_unescape(). We special
21 * case the empty string. */
26 r = new(char, strlen(s)*3 + 1);
30 for (f = s, t = r; *f; f++) {
32 /* Escape everything that is not a-zA-Z0-9. We also
33 * escape 0-9 if it's the first character */
35 if (!(*f >= 'A' && *f <= 'Z') &&
36 !(*f >= 'a' && *f <= 'z') &&
37 !(f > s && *f >= '0' && *f <= '9')) {
39 *(t++) = hexchar(*f >> 4);
50 char *bus_label_unescape_n(const char *f, size_t l) {
54 assert_return(f, NULL);
56 /* Special case for the empty string */
57 if (l == 1 && *f == '_')
64 for (i = 0, t = r; i < l; ++i) {
69 (a = unhexchar(f[i + 1])) < 0 ||
70 (b = unhexchar(f[i + 2])) < 0) {
71 /* Invalid escape code, let's take it literal then */
74 *(t++) = (char) ((a << 4) | b);