113 lines
2.9 KiB
C
113 lines
2.9 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these libraries and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/*%% (c) Copyright 1993, 1994 Hewlett-Packard Company */
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/*%% (c) Copyright 1993, 1994 International Business Machines Corp. */
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/*%% (c) Copyright 1993, 1994 Sun Microsystems, Inc. */
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/*%% (c) Copyright 1993, 1994 Novell, Inc. */
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/*%% $XConsortium: iskeyaux.c /main/3 1995/10/23 11:41:11 rswiston $ */
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/*
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* Copyright (c) 1988 by Sun Microsystems, Inc.
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*/
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/*
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* iskeyaux.c
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*
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* Description:
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* Auxiliary key related functions
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*/
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#include "isam_impl.h"
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Blkno _isgetfreekpage();
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/*
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* _isindex_extract()
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*
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* Extract key parts from record buffer
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*/
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void
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_iskey_extract (Keydesc2 *pkeydesc2, char *recp, char *keyp)
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{
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int i;
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struct keypart2 *ppart;
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int nparts;
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nparts = pkeydesc2->k2_nparts;
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ppart = pkeydesc2->k2_part;
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/*
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* XXX - This is a kludge to fix a problem with keys of an odd (ODD as
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* not even) length that are extended to the nearest multiple of 2.
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*
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* It would be better to use bzero() here and not to call it in
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* add1key etc. But this change was done just during the FCS process
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* and may be robust even though it's not the cleanest thing under
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* the sun.
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*/
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keyp[pkeydesc2->k2_len - 1] = '\0';
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for (i = 0; i < nparts; i++) {
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memcpy( keyp + ppart->kp2_offset,recp + ppart->kp2_start,
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ppart->kp2_leng);
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ppart++;
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}
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}
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/*
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* _allockpage()
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*
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* Allocate an initialize new key page.
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*
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* blkno, Output parameter
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*/
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Bufhdr *
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_allockpage(Fcb *fcb, int capac, int level, Blkno *blkno)
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{
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Bufhdr *pbufhdr;
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char *p;
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*blkno = _isindfreel_alloc(fcb);
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/* Fix the block in cache */
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pbufhdr = _isdisk_fix(fcb, fcb->indfd, *blkno, ISFIXNOREAD);
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p = pbufhdr->isb_buffer;
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memset(p, 0, ISPAGESIZE);
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/* Mark page as B-tree page. */
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stshort((short)PT_INDEX, p + BT_TYPE_OFF);
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/* Store page capacity. */
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stshort((short)capac, p + BT_CAPAC_OFF);
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/* Store B-tree level. */
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stshort((short)level, p + BT_LEVEL_OFF);
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return (pbufhdr);
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}
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