HEAD_SIZE
#define HEAD_TYPE (HEAD_SIZE + HEAD_SIZE_LEN)
#define EXCESS_3_2_LEN (HEAD_SIZE + TAIL_LEN)
real_size = stoh(fbp->psave + HEAD_SIZE);
real_size = stoh(fbp->psave + HEAD_SIZE);
size = stoh(msgbuf + HEAD_SIZE) - EXCESS_3_2_LEN;
memmove(msgbuf, msgbuf + HEAD_SIZE, size);
(void) memmove(tmpbuf + HEAD_SIZE, msgbuf, size);
(void) htos(tmpbuf + HEAD_SIZE, size + EXCESS_3_2_LEN);