X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fshared%2Fbus-label.c;h=ccc9f2bf8e58df7c6047bafc13b22c127e77b0bb;hb=30ab6a0fc1bb950c4dcd90dcd3dfe00a810c7fc1;hp=61eb75bca28490decd8c9d924fa265525eac7934;hpb=f01de9656d0969633ac89eb57a0ba4658a100568;p=elogind.git

diff --git a/src/shared/bus-label.c b/src/shared/bus-label.c
index 61eb75bca..ccc9f2bf8 100644
--- a/src/shared/bus-label.c
+++ b/src/shared/bus-label.c
@@ -19,13 +19,10 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#include <assert.h>
 #include <stdlib.h>
-#include <unistd.h>
 
 #include "util.h"
 #include "macro.h"
-#include "def.h"
 
 #include "bus-label.h"
 
@@ -66,34 +63,35 @@ char *bus_label_escape(const char *s) {
         return r;
 }
 
-char *bus_label_unescape(const char *f) {
+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 (streq(f, "_"))
+        if (l == 1 && *f == '_')
                 return strdup("");
 
-        r = new(char, strlen(f) + 1);
+        r = new(char, l + 1);
         if (!r)
                 return NULL;
 
-        for (t = r; *f; f++) {
-
-                if (*f == '_') {
+        for (i = 0, t = r; i < l; ++i) {
+                if (f[i] == '_') {
                         int a, b;
 
-                        if ((a = unhexchar(f[1])) < 0 ||
-                            (b = unhexchar(f[2])) < 0) {
+                        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);
-                                f += 2;
+                                i += 2;
                         }
                 } else
-                        *(t++) = *f;
+                        *(t++) = f[i];
         }
 
         *t = 0;