grub_strncat
grub_strncat (device, tmp, sizeof (device));
grub_strncat (device, tmp, sizeof (device));
grub_strncat (device, ")", sizeof (device));
#define strncat grub_strncat
int grub_strncat (char *s1, const char *s2, int n);
int grub_strncat (char *s1, const char *s2, int n);
grub_strncat (default_file + i, "default", DEFAULT_FILE_BUFLEN - i);