+extern struct stats stats;
+extern char *backup_dir;
+extern char *log_format;
+extern char *backup_suffix;
+extern int backup_suffix_len;
+
+
+static int is_backup_file(char *fn)
+{
+ int k = strlen(fn) - backup_suffix_len;
+ return k > 0 && strcmp(fn+k, backup_suffix) == 0;
+}