send_dir
send_dir(sp, 0);
send_dir(sp, sp->file->dir);
void send_dir(struct ship *ship, long a);
uint8_t send_dir;
send_dir = SEND_FWD;
send_dir = SEND_REV;
send_dir = SEND_FWD | SEND_REV;
if (send_dir & SEND_REV)
if (send_dir & SEND_FWD)