157 } bdhead_t;  typedef
158 #define BDH(p) ((bdhead_t *)(p))
581       bdhead_t *bdh;  in bget()
583       size += sizeof(bdhead_t) - sizeof(bhead_t);  in bget()
647       bdhead_t *bd;  in bgetz()
649       bd = BDH(buf - sizeof(bdhead_t));  in bgetz()
650       rsize = bd->tsize - (bufsize)sizeof(bdhead_t);  in bgetz()
683     bdhead_t *bd;  in bgetr()
685     bd = BDH(((char *)buf) - sizeof(bdhead_t));  in bgetr()
686     osize = bd->tsize - (bufsize)sizeof(bdhead_t);  in bgetr()
712     bdhead_t *bdh;  in brel()
714     bdh = BDH(((char *)buf) - sizeof(bdhead_t));  in brel()
722     (void)memset((char *)buf, 0x55, (size_t)(bdh->tsize - sizeof(bdhead_t)));  in brel()