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-rw-r--r--src/shared/path-util.c34
-rw-r--r--src/shared/path-util.h1
2 files changed, 35 insertions, 0 deletions
diff --git a/src/shared/path-util.c b/src/shared/path-util.c
index 665b171263..0744563976 100644
--- a/src/shared/path-util.c
+++ b/src/shared/path-util.c
@@ -539,3 +539,37 @@ bool paths_check_timestamp(const char* const* paths, usec_t *timestamp, bool upd
return changed;
}
+
+char *prefix_root(const char *root, const char *path) {
+ char *n, *p;
+ size_t l;
+
+ /* If root is passed, prefixes path with it. Otherwise returns
+ * it as is. */
+
+ assert(path);
+
+ /* First, drop duplicate prefixing slashes from the path */
+ while (path[0] == '/' && path[1] == '/')
+ path++;
+
+ if (isempty(root) || path_equal(root, "/"))
+ return strdup(path);
+
+ l = strlen(root) + 1 + strlen(path) + 1;
+
+ n = new(char, l);
+ if (!n)
+ return NULL;
+
+ p = stpcpy(n, root);
+
+ while (p > n && p[-1] == '/')
+ p--;
+
+ if (path[0] != '/')
+ *(p++) = '/';
+
+ strcpy(p, path);
+ return n;
+}
diff --git a/src/shared/path-util.h b/src/shared/path-util.h
index 56d1c52ae2..0123c2609c 100644
--- a/src/shared/path-util.h
+++ b/src/shared/path-util.h
@@ -38,3 +38,4 @@ int fd_is_mount_point(int fd);
int path_is_mount_point(const char *path, bool allow_symlink);
bool paths_check_timestamp(const char* const* paths, usec_t *paths_ts_usec, bool update);
+char *prefix_root(const char *root, const char *path);