mirror of
https://github.com/postgres/postgres.git
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Massive commit to run PGINDENT on all *.c and *.h files.
This commit is contained in:
Bruce Momjian
@@ -1,19 +1,19 @@
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/*-------------------------------------------------------------------------
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*
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* rtget.c--
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* fetch tuples from an rtree scan.
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* fetch tuples from an rtree scan.
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/access/rtree/Attic/rtget.c,v 1.7 1996/11/21 06:13:43 vadim Exp $
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* $Header: /cvsroot/pgsql/src/backend/access/rtree/Attic/rtget.c,v 1.8 1997/09/07 04:39:11 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include <postgres.h>
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#include <storage/bufmgr.h>
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#include <access/sdir.h>
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#include <access/relscan.h>
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@@ -21,14 +21,15 @@
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#include <access/rtree.h>
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#include <storage/bufpage.h>
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#ifndef HAVE_MEMMOVE
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# include <regex/utils.h>
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#include <regex/utils.h>
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#else
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# include <string.h>
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#include <string.h>
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#endif
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static OffsetNumber findnext(IndexScanDesc s, Page p, OffsetNumber n,
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ScanDirection dir);
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static OffsetNumber
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findnext(IndexScanDesc s, Page p, OffsetNumber n,
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ScanDirection dir);
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static RetrieveIndexResult rtscancache(IndexScanDesc s, ScanDirection dir);
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static RetrieveIndexResult rtfirst(IndexScanDesc s, ScanDirection dir);
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static RetrieveIndexResult rtnext(IndexScanDesc s, ScanDirection dir);
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@@ -38,278 +39,315 @@ static ItemPointer rtheapptr(Relation r, ItemPointer itemp);
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RetrieveIndexResult
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rtgettuple(IndexScanDesc s, ScanDirection dir)
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{
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RetrieveIndexResult res;
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/* if we have it cached in the scan desc, just return the value */
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if ((res = rtscancache(s, dir)) != (RetrieveIndexResult) NULL)
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RetrieveIndexResult res;
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/* if we have it cached in the scan desc, just return the value */
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if ((res = rtscancache(s, dir)) != (RetrieveIndexResult) NULL)
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return (res);
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/* not cached, so we'll have to do some work */
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if (ItemPointerIsValid(&(s->currentItemData)))
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{
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res = rtnext(s, dir);
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}
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else
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{
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res = rtfirst(s, dir);
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}
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return (res);
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/* not cached, so we'll have to do some work */
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if (ItemPointerIsValid(&(s->currentItemData))) {
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res = rtnext(s, dir);
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} else {
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res = rtfirst(s, dir);
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}
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return (res);
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}
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static RetrieveIndexResult
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static RetrieveIndexResult
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rtfirst(IndexScanDesc s, ScanDirection dir)
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{
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Buffer b;
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Page p;
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OffsetNumber n;
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OffsetNumber maxoff;
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RetrieveIndexResult res;
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RTreePageOpaque po;
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RTreeScanOpaque so;
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RTSTACK *stk;
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BlockNumber blk;
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IndexTuple it;
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b = ReadBuffer(s->relation, P_ROOT);
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p = BufferGetPage(b);
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po = (RTreePageOpaque) PageGetSpecialPointer(p);
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so = (RTreeScanOpaque) s->opaque;
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for (;;) {
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maxoff = PageGetMaxOffsetNumber(p);
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if (ScanDirectionIsBackward(dir))
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n = findnext(s, p, maxoff, dir);
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else
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n = findnext(s, p, FirstOffsetNumber, dir);
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while (n < FirstOffsetNumber || n > maxoff) {
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ReleaseBuffer(b);
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if (so->s_stack == (RTSTACK *) NULL)
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return ((RetrieveIndexResult) NULL);
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stk = so->s_stack;
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b = ReadBuffer(s->relation, stk->rts_blk);
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p = BufferGetPage(b);
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po = (RTreePageOpaque) PageGetSpecialPointer(p);
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maxoff = PageGetMaxOffsetNumber(p);
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if (ScanDirectionIsBackward(dir)) {
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n = OffsetNumberPrev(stk->rts_child);
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} else {
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n = OffsetNumberNext(stk->rts_child);
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}
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so->s_stack = stk->rts_parent;
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pfree(stk);
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n = findnext(s, p, n, dir);
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Buffer b;
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Page p;
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OffsetNumber n;
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OffsetNumber maxoff;
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RetrieveIndexResult res;
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RTreePageOpaque po;
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RTreeScanOpaque so;
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RTSTACK *stk;
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BlockNumber blk;
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IndexTuple it;
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b = ReadBuffer(s->relation, P_ROOT);
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p = BufferGetPage(b);
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po = (RTreePageOpaque) PageGetSpecialPointer(p);
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so = (RTreeScanOpaque) s->opaque;
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for (;;)
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{
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maxoff = PageGetMaxOffsetNumber(p);
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if (ScanDirectionIsBackward(dir))
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n = findnext(s, p, maxoff, dir);
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else
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n = findnext(s, p, FirstOffsetNumber, dir);
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while (n < FirstOffsetNumber || n > maxoff)
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{
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ReleaseBuffer(b);
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if (so->s_stack == (RTSTACK *) NULL)
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return ((RetrieveIndexResult) NULL);
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stk = so->s_stack;
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b = ReadBuffer(s->relation, stk->rts_blk);
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p = BufferGetPage(b);
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po = (RTreePageOpaque) PageGetSpecialPointer(p);
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maxoff = PageGetMaxOffsetNumber(p);
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if (ScanDirectionIsBackward(dir))
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{
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n = OffsetNumberPrev(stk->rts_child);
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}
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else
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{
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n = OffsetNumberNext(stk->rts_child);
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}
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so->s_stack = stk->rts_parent;
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pfree(stk);
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n = findnext(s, p, n, dir);
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}
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if (po->flags & F_LEAF)
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{
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ItemPointerSet(&(s->currentItemData), BufferGetBlockNumber(b), n);
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it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
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res = FormRetrieveIndexResult(&(s->currentItemData), &(it->t_tid));
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ReleaseBuffer(b);
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return (res);
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}
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else
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{
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stk = (RTSTACK *) palloc(sizeof(RTSTACK));
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stk->rts_child = n;
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stk->rts_blk = BufferGetBlockNumber(b);
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stk->rts_parent = so->s_stack;
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so->s_stack = stk;
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it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
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blk = ItemPointerGetBlockNumber(&(it->t_tid));
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ReleaseBuffer(b);
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b = ReadBuffer(s->relation, blk);
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p = BufferGetPage(b);
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po = (RTreePageOpaque) PageGetSpecialPointer(p);
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}
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}
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if (po->flags & F_LEAF) {
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ItemPointerSet(&(s->currentItemData), BufferGetBlockNumber(b), n);
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it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
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res = FormRetrieveIndexResult(&(s->currentItemData), &(it->t_tid));
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ReleaseBuffer(b);
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return (res);
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} else {
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stk = (RTSTACK *) palloc(sizeof(RTSTACK));
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stk->rts_child = n;
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stk->rts_blk = BufferGetBlockNumber(b);
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stk->rts_parent = so->s_stack;
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so->s_stack = stk;
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it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
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blk = ItemPointerGetBlockNumber(&(it->t_tid));
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ReleaseBuffer(b);
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b = ReadBuffer(s->relation, blk);
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p = BufferGetPage(b);
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po = (RTreePageOpaque) PageGetSpecialPointer(p);
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}
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}
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}
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static RetrieveIndexResult
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static RetrieveIndexResult
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rtnext(IndexScanDesc s, ScanDirection dir)
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{
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Buffer b;
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Page p;
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OffsetNumber n;
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OffsetNumber maxoff;
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RetrieveIndexResult res;
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RTreePageOpaque po;
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RTreeScanOpaque so;
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RTSTACK *stk;
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BlockNumber blk;
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IndexTuple it;
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blk = ItemPointerGetBlockNumber(&(s->currentItemData));
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n = ItemPointerGetOffsetNumber(&(s->currentItemData));
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if (ScanDirectionIsForward(dir)) {
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n = OffsetNumberNext(n);
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} else {
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n = OffsetNumberPrev(n);
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}
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Buffer b;
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Page p;
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OffsetNumber n;
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OffsetNumber maxoff;
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RetrieveIndexResult res;
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RTreePageOpaque po;
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RTreeScanOpaque so;
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RTSTACK *stk;
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BlockNumber blk;
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IndexTuple it;
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b = ReadBuffer(s->relation, blk);
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p = BufferGetPage(b);
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po = (RTreePageOpaque) PageGetSpecialPointer(p);
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so = (RTreeScanOpaque) s->opaque;
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for (;;) {
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maxoff = PageGetMaxOffsetNumber(p);
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n = findnext(s, p, n, dir);
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while (n < FirstOffsetNumber || n > maxoff) {
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ReleaseBuffer(b);
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if (so->s_stack == (RTSTACK *) NULL)
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return ((RetrieveIndexResult) NULL);
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stk = so->s_stack;
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b = ReadBuffer(s->relation, stk->rts_blk);
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p = BufferGetPage(b);
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maxoff = PageGetMaxOffsetNumber(p);
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po = (RTreePageOpaque) PageGetSpecialPointer(p);
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if (ScanDirectionIsBackward(dir)) {
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n = OffsetNumberPrev(stk->rts_child);
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} else {
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n = OffsetNumberNext(stk->rts_child);
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}
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so->s_stack = stk->rts_parent;
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pfree(stk);
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n = findnext(s, p, n, dir);
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blk = ItemPointerGetBlockNumber(&(s->currentItemData));
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n = ItemPointerGetOffsetNumber(&(s->currentItemData));
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if (ScanDirectionIsForward(dir))
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{
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n = OffsetNumberNext(n);
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}
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if (po->flags & F_LEAF) {
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ItemPointerSet(&(s->currentItemData), BufferGetBlockNumber(b), n);
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it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
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res = FormRetrieveIndexResult(&(s->currentItemData), &(it->t_tid));
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ReleaseBuffer(b);
|
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return (res);
|
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} else {
|
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stk = (RTSTACK *) palloc(sizeof(RTSTACK));
|
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stk->rts_child = n;
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stk->rts_blk = BufferGetBlockNumber(b);
|
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stk->rts_parent = so->s_stack;
|
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so->s_stack = stk;
|
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it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
|
||||
blk = ItemPointerGetBlockNumber(&(it->t_tid));
|
||||
|
||||
ReleaseBuffer(b);
|
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b = ReadBuffer(s->relation, blk);
|
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p = BufferGetPage(b);
|
||||
po = (RTreePageOpaque) PageGetSpecialPointer(p);
|
||||
|
||||
if (ScanDirectionIsBackward(dir)) {
|
||||
n = PageGetMaxOffsetNumber(p);
|
||||
} else {
|
||||
n = FirstOffsetNumber;
|
||||
}
|
||||
else
|
||||
{
|
||||
n = OffsetNumberPrev(n);
|
||||
}
|
||||
|
||||
b = ReadBuffer(s->relation, blk);
|
||||
p = BufferGetPage(b);
|
||||
po = (RTreePageOpaque) PageGetSpecialPointer(p);
|
||||
so = (RTreeScanOpaque) s->opaque;
|
||||
|
||||
for (;;)
|
||||
{
|
||||
maxoff = PageGetMaxOffsetNumber(p);
|
||||
n = findnext(s, p, n, dir);
|
||||
|
||||
while (n < FirstOffsetNumber || n > maxoff)
|
||||
{
|
||||
|
||||
ReleaseBuffer(b);
|
||||
if (so->s_stack == (RTSTACK *) NULL)
|
||||
return ((RetrieveIndexResult) NULL);
|
||||
|
||||
stk = so->s_stack;
|
||||
b = ReadBuffer(s->relation, stk->rts_blk);
|
||||
p = BufferGetPage(b);
|
||||
maxoff = PageGetMaxOffsetNumber(p);
|
||||
po = (RTreePageOpaque) PageGetSpecialPointer(p);
|
||||
|
||||
if (ScanDirectionIsBackward(dir))
|
||||
{
|
||||
n = OffsetNumberPrev(stk->rts_child);
|
||||
}
|
||||
else
|
||||
{
|
||||
n = OffsetNumberNext(stk->rts_child);
|
||||
}
|
||||
so->s_stack = stk->rts_parent;
|
||||
pfree(stk);
|
||||
|
||||
n = findnext(s, p, n, dir);
|
||||
}
|
||||
if (po->flags & F_LEAF)
|
||||
{
|
||||
ItemPointerSet(&(s->currentItemData), BufferGetBlockNumber(b), n);
|
||||
|
||||
it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
|
||||
|
||||
res = FormRetrieveIndexResult(&(s->currentItemData), &(it->t_tid));
|
||||
|
||||
ReleaseBuffer(b);
|
||||
return (res);
|
||||
}
|
||||
else
|
||||
{
|
||||
stk = (RTSTACK *) palloc(sizeof(RTSTACK));
|
||||
stk->rts_child = n;
|
||||
stk->rts_blk = BufferGetBlockNumber(b);
|
||||
stk->rts_parent = so->s_stack;
|
||||
so->s_stack = stk;
|
||||
|
||||
it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
|
||||
blk = ItemPointerGetBlockNumber(&(it->t_tid));
|
||||
|
||||
ReleaseBuffer(b);
|
||||
b = ReadBuffer(s->relation, blk);
|
||||
p = BufferGetPage(b);
|
||||
po = (RTreePageOpaque) PageGetSpecialPointer(p);
|
||||
|
||||
if (ScanDirectionIsBackward(dir))
|
||||
{
|
||||
n = PageGetMaxOffsetNumber(p);
|
||||
}
|
||||
else
|
||||
{
|
||||
n = FirstOffsetNumber;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static OffsetNumber
|
||||
static OffsetNumber
|
||||
findnext(IndexScanDesc s, Page p, OffsetNumber n, ScanDirection dir)
|
||||
{
|
||||
OffsetNumber maxoff;
|
||||
IndexTuple it;
|
||||
RTreePageOpaque po;
|
||||
RTreeScanOpaque so;
|
||||
|
||||
maxoff = PageGetMaxOffsetNumber(p);
|
||||
po = (RTreePageOpaque) PageGetSpecialPointer(p);
|
||||
so = (RTreeScanOpaque) s->opaque;
|
||||
|
||||
/*
|
||||
* If we modified the index during the scan, we may have a pointer to
|
||||
* a ghost tuple, before the scan. If this is the case, back up one.
|
||||
*/
|
||||
|
||||
if (so->s_flags & RTS_CURBEFORE) {
|
||||
so->s_flags &= ~RTS_CURBEFORE;
|
||||
n = OffsetNumberPrev(n);
|
||||
}
|
||||
|
||||
while (n >= FirstOffsetNumber && n <= maxoff) {
|
||||
it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
|
||||
if (po->flags & F_LEAF) {
|
||||
if (index_keytest(it,
|
||||
RelationGetTupleDescriptor(s->relation),
|
||||
s->numberOfKeys, s->keyData))
|
||||
break;
|
||||
} else {
|
||||
if (index_keytest(it,
|
||||
RelationGetTupleDescriptor(s->relation),
|
||||
so->s_internalNKey, so->s_internalKey))
|
||||
break;
|
||||
OffsetNumber maxoff;
|
||||
IndexTuple it;
|
||||
RTreePageOpaque po;
|
||||
RTreeScanOpaque so;
|
||||
|
||||
maxoff = PageGetMaxOffsetNumber(p);
|
||||
po = (RTreePageOpaque) PageGetSpecialPointer(p);
|
||||
so = (RTreeScanOpaque) s->opaque;
|
||||
|
||||
/*
|
||||
* If we modified the index during the scan, we may have a pointer to
|
||||
* a ghost tuple, before the scan. If this is the case, back up one.
|
||||
*/
|
||||
|
||||
if (so->s_flags & RTS_CURBEFORE)
|
||||
{
|
||||
so->s_flags &= ~RTS_CURBEFORE;
|
||||
n = OffsetNumberPrev(n);
|
||||
}
|
||||
|
||||
if (ScanDirectionIsBackward(dir)) {
|
||||
n = OffsetNumberPrev(n);
|
||||
} else {
|
||||
n = OffsetNumberNext(n);
|
||||
|
||||
while (n >= FirstOffsetNumber && n <= maxoff)
|
||||
{
|
||||
it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
|
||||
if (po->flags & F_LEAF)
|
||||
{
|
||||
if (index_keytest(it,
|
||||
RelationGetTupleDescriptor(s->relation),
|
||||
s->numberOfKeys, s->keyData))
|
||||
break;
|
||||
}
|
||||
else
|
||||
{
|
||||
if (index_keytest(it,
|
||||
RelationGetTupleDescriptor(s->relation),
|
||||
so->s_internalNKey, so->s_internalKey))
|
||||
break;
|
||||
}
|
||||
|
||||
if (ScanDirectionIsBackward(dir))
|
||||
{
|
||||
n = OffsetNumberPrev(n);
|
||||
}
|
||||
else
|
||||
{
|
||||
n = OffsetNumberNext(n);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return (n);
|
||||
|
||||
return (n);
|
||||
}
|
||||
|
||||
static RetrieveIndexResult
|
||||
static RetrieveIndexResult
|
||||
rtscancache(IndexScanDesc s, ScanDirection dir)
|
||||
{
|
||||
RetrieveIndexResult res;
|
||||
ItemPointer ip;
|
||||
|
||||
if (!(ScanDirectionIsNoMovement(dir)
|
||||
&& ItemPointerIsValid(&(s->currentItemData)))) {
|
||||
|
||||
return ((RetrieveIndexResult) NULL);
|
||||
}
|
||||
|
||||
ip = rtheapptr(s->relation, &(s->currentItemData));
|
||||
|
||||
if (ItemPointerIsValid(ip))
|
||||
res = FormRetrieveIndexResult(&(s->currentItemData), ip);
|
||||
else
|
||||
res = (RetrieveIndexResult) NULL;
|
||||
|
||||
pfree (ip);
|
||||
RetrieveIndexResult res;
|
||||
ItemPointer ip;
|
||||
|
||||
return (res);
|
||||
if (!(ScanDirectionIsNoMovement(dir)
|
||||
&& ItemPointerIsValid(&(s->currentItemData))))
|
||||
{
|
||||
|
||||
return ((RetrieveIndexResult) NULL);
|
||||
}
|
||||
|
||||
ip = rtheapptr(s->relation, &(s->currentItemData));
|
||||
|
||||
if (ItemPointerIsValid(ip))
|
||||
res = FormRetrieveIndexResult(&(s->currentItemData), ip);
|
||||
else
|
||||
res = (RetrieveIndexResult) NULL;
|
||||
|
||||
pfree(ip);
|
||||
|
||||
return (res);
|
||||
}
|
||||
|
||||
/*
|
||||
* rtheapptr returns the item pointer to the tuple in the heap relation
|
||||
* for which itemp is the index relation item pointer.
|
||||
* rtheapptr returns the item pointer to the tuple in the heap relation
|
||||
* for which itemp is the index relation item pointer.
|
||||
*/
|
||||
static ItemPointer
|
||||
static ItemPointer
|
||||
rtheapptr(Relation r, ItemPointer itemp)
|
||||
{
|
||||
Buffer b;
|
||||
Page p;
|
||||
IndexTuple it;
|
||||
ItemPointer ip;
|
||||
OffsetNumber n;
|
||||
|
||||
ip = (ItemPointer) palloc(sizeof(ItemPointerData));
|
||||
if (ItemPointerIsValid(itemp)) {
|
||||
b = ReadBuffer(r, ItemPointerGetBlockNumber(itemp));
|
||||
p = BufferGetPage(b);
|
||||
n = ItemPointerGetOffsetNumber(itemp);
|
||||
it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
|
||||
memmove((char *) ip, (char *) &(it->t_tid),
|
||||
sizeof(ItemPointerData));
|
||||
ReleaseBuffer(b);
|
||||
} else {
|
||||
ItemPointerSetInvalid(ip);
|
||||
}
|
||||
|
||||
return (ip);
|
||||
Buffer b;
|
||||
Page p;
|
||||
IndexTuple it;
|
||||
ItemPointer ip;
|
||||
OffsetNumber n;
|
||||
|
||||
ip = (ItemPointer) palloc(sizeof(ItemPointerData));
|
||||
if (ItemPointerIsValid(itemp))
|
||||
{
|
||||
b = ReadBuffer(r, ItemPointerGetBlockNumber(itemp));
|
||||
p = BufferGetPage(b);
|
||||
n = ItemPointerGetOffsetNumber(itemp);
|
||||
it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
|
||||
memmove((char *) ip, (char *) &(it->t_tid),
|
||||
sizeof(ItemPointerData));
|
||||
ReleaseBuffer(b);
|
||||
}
|
||||
else
|
||||
{
|
||||
ItemPointerSetInvalid(ip);
|
||||
}
|
||||
|
||||
return (ip);
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user