183 lines
4.0 KiB
C
183 lines
4.0 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: iskeycmp.c /main/3 1995/10/23 11:41:41 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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* iskeycmp.c
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*
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* Description:
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* ISAM index comparison functions
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*/
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#include "isam_impl.h"
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static struct keypart2 *_curtab; /* Current comparison */
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/* descriptor table */
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static int _ncurtab; /* Number of entries */
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/*
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* _iskeycmp_set()
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*
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* Set key decriptor and number of parts for subsequent key comparison.s
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* nparts, Use only so many parts
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*/
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void
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_iskeycmp_set (Keydesc2 *pkeydesc2, int nparts)
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{
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_ncurtab = nparts;
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_curtab = pkeydesc2->k2_part;
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assert(_ncurtab <= pkeydesc2->k2_nparts + 1); /* + 1 for recno */
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}
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/*
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* Return number that is > 0 if l > r,
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* = 0 if l = r,
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* < 0 if l < r.
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*/
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int
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_iskeycmp(const void *lkey, const void *rkey)
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{
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int i, ret;
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struct keypart2 *p;
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char *l, *r;
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long llong, rlong;
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double ldouble, rdouble;
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const char* charLkey = (const char*)lkey;
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const char* charRkey = (const char*)rkey;
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ret = 0;
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for (i = 0, p = _curtab; ret == 0 && i < _ncurtab;i++, p++) {
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l = charLkey + p->kp2_offset;
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r = charRkey + p->kp2_offset;
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switch (p->kp2_type) {
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case CHARTYPE:
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case BINTYPE:
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ret = memcmp(l, r, p->kp2_leng);
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break;
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case LONGTYPE:
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llong = ldlong(l);
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rlong = ldlong(r);
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if (llong > rlong)
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ret = 1;
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else if (llong < rlong)
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ret = -1;
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break;
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case SHORTTYPE:
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llong = (long)ldshort(l);
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rlong = (long)ldshort(r);
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if (llong > rlong)
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ret = 1;
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else if (llong < rlong)
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ret = -1;
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break;
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case DOUBLETYPE:
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ldouble = lddbl(l);
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rdouble = lddbl(r);
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if (ldouble > rdouble)
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ret = 1;
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else if (ldouble < rdouble)
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ret = -1;
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break;
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case FLOATTYPE:
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ldouble = (double)ldfloat(l);
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rdouble = (double)ldfloat(r);
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if (ldouble > rdouble)
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ret = 1;
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else if (ldouble < rdouble)
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ret = -1;
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break;
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case CHARTYPE + ISDESC:
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case BINTYPE + ISDESC:
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ret = memcmp(r, l, p->kp2_leng);
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break;
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case LONGTYPE + ISDESC:
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llong = ldlong(l);
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rlong = ldlong(r);
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if (llong > rlong)
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ret = -1;
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else if (llong < rlong)
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ret = 1;
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break;
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case SHORTTYPE + ISDESC:
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llong = (long)ldshort(l);
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rlong = (long)ldshort(r);
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if (llong > rlong)
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ret = -1;
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else if (llong < rlong)
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ret = 1;
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break;
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case DOUBLETYPE + ISDESC:
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ldouble = lddbl(l);
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rdouble = lddbl(r);
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if (ldouble > rdouble)
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ret = -1;
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else if (ldouble < rdouble)
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ret = 1;
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break;
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case FLOATTYPE + ISDESC:
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ldouble = (double)ldfloat(l);
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rdouble = (double)ldfloat(r);
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if (ldouble > rdouble)
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ret = -1;
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else if (ldouble < rdouble)
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ret = 1;
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break;
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default:
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_isfatal_error("Bad data conversion descriptor");
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break;
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}
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}
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return (ret);
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}
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