Markus Armbruster
358aee203e
Store them and ef_type in bit-fields. Allocate eight bits for ef_type. Values range from 0 to EF_GAME (currently 16), so this is plenty. Allocate twelve bits for sequence numbers. Sequence number mismatches are now missed when the numbers are equal modulo 2^12. Still sufficiently improbable. Common machines store the bit-fields in a 32 bit word. There are twelve bits left in that word for future use. Total savings 16 bits, which is exactly what the previous commit spent on wider uids on common machines.
65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2009, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ---
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*
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* See files README, COPYING and CREDITS in the root of the source
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* tree for related information and legal notices. It is expected
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* that future projects/authors will amend these files as needed.
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*
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* ---
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*
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* commodity.h: Definitions for buy/market/sell commands in a time delay
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* market
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*
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* Known contributors to this file:
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* Pat Loney, 1992
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* Steve McClure, 1996
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*/
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#ifndef COMMODITY_H
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#define COMMODITY_H
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#include <time.h>
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#include "types.h"
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#include "item.h"
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struct comstr {
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/* initial part must match struct empobj */
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signed ef_type: 8;
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unsigned com_seqno: 12;
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int com_uid;
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time_t com_timestamp;
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natid com_owner;
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/* end of part matching struct empobj */
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i_type com_type;
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int com_amount;
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float com_price;
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int com_maxbidder;
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time_t com_markettime;
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coord com_x;
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coord com_y;
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coord sell_x;
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coord sell_y;
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};
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#define getcomm(n, p) ef_read(EF_COMM, (n), (p))
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#define putcomm(n, p) ef_write(EF_COMM, (n), (p))
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#endif
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