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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#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 (!ascii_isalpha(*f) &&
!(f > s && ascii_isdigit(*f))) {
*(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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