/*
* tidsend - converts tid to binary format
*/
Datum
tidsend(PG_FUNCTION_ARGS)
{
ItemPointer itemPtr = PG_GETARG_ITEMPOINTER(0);
StringInfoData buf;
pq_begintypsend(&buf);
pq_sendint32(&buf, ItemPointerGetBlockNumberNoCheck(itemPtr));
pq_sendint16(&buf, ItemPointerGetOffsetNumberNoCheck(itemPtr));
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
/*
* ItemPointerCompare
* Generic btree-style comparison for item pointers.
*/
int32
ItemPointerCompare(ItemPointer arg1, ItemPointer arg2)
{
/*
* Use ItemPointerGet{Offset,Block}NumberNoCheck to avoid asserting
* ip_posid != 0, which may not be true for a user-supplied TID.
*/
BlockNumber b1 = ItemPointerGetBlockNumberNoCheck(arg1);
BlockNumber b2 = ItemPointerGetBlockNumberNoCheck(arg2);
if (b1 < b2)
return -1;
else if (b1 > b2)
return 1;
else if (ItemPointerGetOffsetNumberNoCheck(arg1) <
ItemPointerGetOffsetNumberNoCheck(arg2))
return -1;
else if (ItemPointerGetOffsetNumberNoCheck(arg1) >
ItemPointerGetOffsetNumberNoCheck(arg2))
return 1;
else
return 0;
}
/* ----------------------------------------------------------------
* tidout
* ----------------------------------------------------------------
*/
Datum
tidout(PG_FUNCTION_ARGS)
{
ItemPointer itemPtr = PG_GETARG_ITEMPOINTER(0);
BlockNumber blockNumber;
OffsetNumber offsetNumber;
char buf[32];
blockNumber = ItemPointerGetBlockNumberNoCheck(itemPtr);
offsetNumber = ItemPointerGetOffsetNumberNoCheck(itemPtr);
/* Perhaps someday we should output this as a record. */
snprintf(buf, sizeof(buf), "(%u,%u)", blockNumber, offsetNumber);
PG_RETURN_CSTRING(pstrdup(buf));
}
/*-------------------------------------------------------
* bt_page_print_tuples()
*
* Form a tuple describing index tuple at a given offset
* ------------------------------------------------------
*/
static Datum
bt_page_print_tuples(FuncCallContext *fctx, Page page, OffsetNumber offset)
{
char *values[6];
HeapTuple tuple;
ItemId id;
IndexTuple itup;
int j;
int off;
int dlen;
char *dump;
char *ptr;
id = PageGetItemId(page, offset);
if (!ItemIdIsValid(id))
elog(ERROR, "invalid ItemId");
itup = (IndexTuple) PageGetItem(page, id);
j = 0;
values[j++] = psprintf("%d", offset);
values[j++] = psprintf("(%u,%u)",
ItemPointerGetBlockNumberNoCheck(&itup->t_tid),
ItemPointerGetOffsetNumberNoCheck(&itup->t_tid));
values[j++] = psprintf("%d", (int) IndexTupleSize(itup));
values[j++] = psprintf("%c", IndexTupleHasNulls(itup) ? 't' : 'f');
values[j++] = psprintf("%c", IndexTupleHasVarwidths(itup) ? 't' : 'f');
ptr = (char *) itup + IndexInfoFindDataOffset(itup->t_info);
dlen = IndexTupleSize(itup) - IndexInfoFindDataOffset(itup->t_info);
dump = palloc0(dlen * 3 + 1);
values[j] = dump;
for (off = 0; off < dlen; off++)
{
if (off > 0)
*dump++ = ' ';
sprintf(dump, "%02x", *(ptr + off) & 0xff);
dump += 2;
}
tuple = BuildTupleFromCStrings(fctx->attinmeta, values);
return HeapTupleGetDatum(tuple);
}
