97  * The overhead on a block is at least 4 bytes.  When free, this space
109 union overhead {  union
110     union overhead *ov_next;	/* when free */
142  * smallest allocatable block is 8 bytes.  The overhead information
146 static union overhead *nextf[NBUCKETS] IZERO_STRUCT;
155 static	int	findbucket	(union overhead *, int);
180     union overhead *p;  in malloc()
201     nbytes = MEMALIGN(MEMALIGN(sizeof(union overhead)) + nbytes + RSLOP);  in malloc()
238     return ((memalign_t) (((caddr_t) p) + MEMALIGN(sizeof(union overhead))));  in malloc()
254     union overhead *op;  in morecore()
265     op = (union overhead *) sbrk(0);  in morecore()
278     op = (union overhead *) memtop;  in morecore()
288 	op = (union overhead *) (((U_long) op + (ROUNDUP + 1)) & ~ROUNDUP);  in morecore()
297 	op->ov_next = (union overhead *) (((caddr_t) op) + siz);  in morecore()
298 	op = (union overhead *) (((caddr_t) op) + siz);  in morecore()
310     union overhead *op;  in free()
324     op = (union overhead *) (((caddr_t) cp) - MEMALIGN(sizeof(union overhead)));  in free()
390     union overhead *op;  in realloc()
397     op = (union overhead *) (((caddr_t) cp) - MEMALIGN(sizeof(union overhead)));  in realloc()
416     onb = MEMALIGN(nbytes + MEMALIGN(sizeof(union overhead)) + RSLOP);  in realloc()
423 	nbytes = MEMALIGN(MEMALIGN(sizeof(union overhead))+nbytes+RSLOP);  in realloc()
437 	onb = (1 << (i + 3)) - MEMALIGN(sizeof(union overhead)) - RSLOP;  in realloc()
466     const union overhead *op = (const union overhead *)  in malloc_usable_size()
482 findbucket(union overhead *freep, int srchlen)  in findbucket()
484     union overhead *p;  in findbucket()
612     union overhead *p;  in showall()