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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2013 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <stdlib.h>
#include "alloc-util.h"
#include "bus-label.h"
#include "hexdecoct.h"
#include "macro.h"
char *bus_label_escape(const char *s) {
char *r, *t;
const char *f;
assert_return(s, NULL);
/* Escapes all chars that D-Bus' object path cannot deal
* with. Can be reversed with bus_path_unescape(). We special
* case the empty string. */
if (*s == 0)
return strdup("_");
r = new(char, strlen(s)*3 + 1);
if (!r)
return NULL;
for (f = s, t = r; *f; f++) {
/* Escape everything that is not a-zA-Z0-9. We also
* escape 0-9 if it's the first character */
if (!(*f >= 'A' && *f <= 'Z') &&
!(*f >= 'a' && *f <= 'z') &&
!(f > s && *f >= '0' && *f <= '9')) {
*(t++) = '_';
*(t++) = hexchar(*f >> 4);
*(t++) = hexchar(*f);
} else
*(t++) = *f;
}
*t = 0;
return r;
}
char *bus_label_unescape_n(const char *f, size_t l) {
char *r, *t;
size_t i;
assert_return(f, NULL);
/* Special case for the empty string */
if (l == 1 && *f == '_')
return strdup("");
r = new(char, l + 1);
if (!r)
return NULL;
for (i = 0, t = r; i < l; ++i) {
if (f[i] == '_') {
int a, b;
if (l - i < 3 ||
(a = unhexchar(f[i + 1])) < 0 ||
(b = unhexchar(f[i + 2])) < 0) {
/* Invalid escape code, let's take it literal then */
*(t++) = '_';
} else {
*(t++) = (char) ((a << 4) | b);
i += 2;
}
} else
*(t++) = f[i];
}
*t = 0;
return r;
}
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