mirror of
git://git.code.sf.net/p/cdesktopenv/code
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133 lines
3.9 KiB
C
133 lines
3.9 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: iskeyconv.c /main/3 1995/10/23 11:41:54 rswiston $ */
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#ifndef lint
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static char sccsid[] = "@(#)iskeyconv.c 1.4 89/07/17 Copyr 1988 Sun Micro";
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#endif
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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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* iskeyconv.c
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*
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* Description:
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* Conversion functions between internal and external key descriptor
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*
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*/
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#include "isam_impl.h"
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/*
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* _iskey_itox(pikdesc,pxkdesc)
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*
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* Convert internal key desc. to X/OPEN key descriptor.
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*
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* @param pikdesc NetISAM internal format
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* @param pxkdesc X/OPEN format
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*/
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void
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_iskey_itox(struct keydesc2 *pikdesc, struct keydesc *pxkdesc)
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{
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int nparts;
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int i;
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memset ((char *)pxkdesc, 0, sizeof (*pxkdesc));
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pxkdesc->k_flags = pikdesc->k2_flags;
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nparts = pxkdesc->k_nparts = pikdesc->k2_nparts;
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for (i = 0; i < nparts;i++) {
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pxkdesc->k_part[i].kp_start = pikdesc->k2_part[i].kp2_start;
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pxkdesc->k_part[i].kp_leng = pikdesc->k2_part[i].kp2_leng;
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pxkdesc->k_part[i].kp_type = pikdesc->k2_part[i].kp2_type;
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}
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}
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/*
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* _iskey_xtoi()
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*
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* Convert X/OPEN key descriptor to internal key descriptor.
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*
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* @param pikdesc NetISAM internal format
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* @param pxkdesc X/OPEN format
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*/
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void
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_iskey_xtoi(struct keydesc2 *pikdesc, struct keydesc *pxkdesc)
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{
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int nparts;
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int i;
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int offset; /* Keep track of offset in key */
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memset ((char *)pikdesc, 0, sizeof (*pikdesc));
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pikdesc->k2_flags = pxkdesc->k_flags;
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nparts = pikdesc->k2_nparts = pxkdesc->k_nparts;
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offset = 0;
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/*
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* Every key entry starts with record number.
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*/
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offset += RECNOSIZE;
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/*
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* If index allows duplicates, the key is augmented with duplicate
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* serial number.
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*/
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if ((pxkdesc->k_flags & DUPSMASK) == ISDUPS)
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offset += DUPIDSIZE;
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for (i = 0; i < nparts; i++) {
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pikdesc->k2_part[i].kp2_start = pxkdesc->k_part[i].kp_start;
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pikdesc->k2_part[i].kp2_leng = pxkdesc->k_part[i].kp_leng;
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pikdesc->k2_part[i].kp2_type = pxkdesc->k_part[i].kp_type;
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pikdesc->k2_part[i].kp2_offset = offset;
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offset += pxkdesc->k_part[i].kp_leng;
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}
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/* Append recno to key descriptors. */
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pikdesc->k2_part[i].kp2_start = 0; /* not used */
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pikdesc->k2_part[i].kp2_leng = RECNOSIZE;
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pikdesc->k2_part[i].kp2_type = RECNOTYPE;
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pikdesc->k2_part[i].kp2_offset = KEY_RECNO_OFF; /* at the beginning of key */
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if ((pxkdesc->k_flags & DUPSMASK) == ISDUPS) {
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/* Append duplicate serial number to key descriptors. */
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pikdesc->k2_part[i].kp2_start = 0; /* not used */
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pikdesc->k2_part[i].kp2_leng = DUPIDSIZE;
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pikdesc->k2_part[i].kp2_type = DUPIDTYPE;
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pikdesc->k2_part[i].kp2_offset = KEY_DUPS_OFF; /* after recno field */
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}
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/* Round up to next multiple of 2. */
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offset = (offset+1) & ~1;
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pikdesc->k2_len = offset; /* Length of the entire key */
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}
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