path-util: fix missing terminating zero

There was this code:

        if (to_path_len > 0)
                memcpy(p, to_path, to_path_len);

That didn't add the terminating zero, so the resulting string was
corrupt if this code path was taken.

Using strcpy() instead of memcpy() solves this issue, and also
simplifies the code.

Previously there was special handling for shortening "../../" to
"../..", but that has now been replaced by a path_kill_slashes() call,
which also makes the result prettier in case the input contains
redundant slashes that would otherwise be copied to the result.

1 files changed, 5 insertions, 10 deletions

diff --git a/src/shared/path-util.c b/src/shared/path-util.c
index 2f38c1096b..5863429c31 100644
--- a/src/shared/path-util.c
+++ b/src/shared/path-util.c
@@ -135,7 +135,6 @@ char *path_make_absolute_cwd(const char *p) {
 int path_make_relative(const char *from_dir, const char *to_path, char **_r) {
         char *r, *p;
         unsigned n_parents;
-        size_t to_path_len;
 
         assert(from_dir);
         assert(to_path);
@@ -168,6 +167,8 @@ int path_make_relative(const char *from_dir, const char *to_path, char **_r) {
                         if (!r)
                                 return -ENOMEM;
 
+                        path_kill_slashes(r);
+
                         *_r = r;
                         return 0;
                 }
@@ -202,21 +203,15 @@ int path_make_relative(const char *from_dir, const char *to_path, char **_r) {
                 n_parents++;
         }
 
-        to_path_len = strlen(to_path);
-
-        r = malloc(n_parents * 3 + to_path_len);
+        r = malloc(n_parents * 3 + strlen(to_path) + 1);
         if (!r)
                 return -ENOMEM;
 
         for (p = r; n_parents > 0; n_parents--, p += 3)
                 memcpy(p, "../", 3);
 
-        if (to_path_len > 0)
-                memcpy(p, to_path, to_path_len);
-        else
-                /* "to_path" is a parent directory of "from_dir". Let's remove
-                 * the redundant slash from the end of the result. */
-                *(p - 1) = 0;
+        strcpy(p, to_path);
+        path_kill_slashes(r);
 
         *_r = r;
         return 0;