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-rw-r--r--src/basic/bus-label.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/src/basic/bus-label.c b/src/basic/bus-label.c
new file mode 100644
index 0000000..d33fc92
--- /dev/null
+++ b/src/basic/bus-label.c
@@ -0,0 +1,79 @@
+/* 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;
+}