bus: implement bus_label_unescape_n()

This is like bus_label_unescape() but takes a maximum length instead of
relying on NULL-terminated strings. This is highly useful to unescape
labels that are not at the end of a path.

1 files changed, 8 insertions, 1 deletions

diff --git a/src/shared/bus-label.h b/src/shared/bus-label.h
index c27c8517fd..ed1dc4e0a7 100644
--- a/src/shared/bus-label.h
+++ b/src/shared/bus-label.h
@@ -21,5 +21,12 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#include <stdlib.h>
+#include <string.h>
+
 char *bus_label_escape(const char *s);
-char *bus_label_unescape(const char *f);
+char *bus_label_unescape_n(const char *f, size_t l);
+
+static inline char *bus_label_unescape(const char *f) {
+        return bus_label_unescape_n(f, f ? strlen(f) : 0);
+}