t_bits alignment fix from Tatsuo Ishii

src/backend/access/common/heaptuple.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/access/common/heaptuple.c,v 1.41 1998/09/01 04:26:39 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/access/common/heaptuple.c,v 1.42 1998/09/04 18:05:38 momjian Exp $
  *
  * NOTES
  *	  The old interface functions have been converted to macros
@@ -809,7 +809,7 @@ heap_formtuple(TupleDesc tupleDescriptor,
 	int			i;
 	int			numberOfAttributes = tupleDescriptor->natts;
 
-	len = sizeof *tuple - sizeof tuple->t_bits;
+	len = offsetof(HeapTuple->t_bits);
 
 	for (i = 0; i < numberOfAttributes && !hasnull; i++)
 	{
@@ -957,7 +957,7 @@ heap_addheader(uint32 natts,	/* max domain index */
 
 	AssertArg(natts > 0);
 
-	len = sizeof(HeapTupleData) - sizeof(tup->t_bits);
+	len = offsetof(HeapTuple->t_bits);
 
 	hoff = len = DOUBLEALIGN(len);		/* be conservative */
 	len += structlen;

src/backend/storage/large_object/inv_api.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/storage/large_object/inv_api.c,v 1.38 1998/09/01 04:31:56 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/storage/large_object/inv_api.c,v 1.39 1998/09/04 18:05:39 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -916,7 +916,9 @@ inv_wrold(LargeObjectDesc *obj_desc,
 	 */
 /*
 	ntup = inv_newtuple(obj_desc, newbuf, newpage, (char *) NULL, tupbytes);
-	dptr = ((char *) ntup) + ntup->t_hoff - sizeof(ntup->t_bits) + sizeof(int4)
+	dptr = ((char *) ntup) + ntup->t_hoff -
+				(sizeof(HeapTupleData) - offsetof(HeapTupleData.t_bits)) +
+				sizeof(int4)
 				+ sizeof(fsblock->vl_len);
 
 	if (obj_desc->offset > obj_desc->lowbyte) {
@@ -996,7 +998,7 @@ inv_newtuple(LargeObjectDesc *obj_desc,
 	char	   *attptr;
 
 	/* compute tuple size -- no nulls */
-	hoff = sizeof(HeapTupleData) - sizeof(ntup->t_bits);
+	hoff = offsetof(HeapTuple->t_bits);
 
 	/* add in olastbyte, varlena.vl_len, varlena.vl_dat */
 	tupsize = hoff + (2 * sizeof(int32)) + nwrite;