71 lines
1.9 KiB
C
71 lines
1.9 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: iskeycalc.c /main/3 1995/10/23 11:41:29 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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* iskeycalc.c
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*
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* Description:
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* Key related calculation functions
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*/
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#include "isam_impl.h"
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/* getkeysperleaf() - Calculate number of keys per leaf node */
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int
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getkeysperleaf (int keylen)
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{
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int n;
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n = ((ISPAGESIZE - BT_KEYS_OFF) / keylen);
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return (le_odd (n)); /* n or n-1 */
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}
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/* getkeyspernode() - Calculate number of keys per non-leaf node */
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int
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getkeyspernode (int keylen)
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{
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int n;
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n = ((ISPAGESIZE - BT_KEYS_OFF) / (keylen + BLKNOSIZE));
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return (le_odd (n)); /* n or n-1 */
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}
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/* le_odd(n) - Get next lower or equal odd number */
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int
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le_odd(int n)
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{
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return ((n - 1) | 1);
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}
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