M src/util/vfs.c → src/util/vfs.c

@@ -168,6 +168,8 @@ if (dirname) {
 			ptrdiff_t len = separatorPoint - path;
 			if (PATH_MAX <= len) {
 				len = PATH_MAX - 1;
+			} else if (!len) {
+				len = 1;
 			}
 			strncpy(dirname, path, len);
 			dirname[len] = '\0';