190 lines
4.3 KiB
C
190 lines
4.3 KiB
C
/*
|
|
* Empire - A multi-player, client/server Internet based war game.
|
|
* Copyright (C) 1986-2008, Dave Pare, Jeff Bailey, Thomas Ruschak,
|
|
* Ken Stevens, Steve McClure
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
* ---
|
|
*
|
|
* See files README, COPYING and CREDITS in the root of the source
|
|
* tree for related information and legal notices. It is expected
|
|
* that future projects/authors will amend these files as needed.
|
|
*
|
|
* ---
|
|
*
|
|
* game.c: Game file access
|
|
*
|
|
* Known contributors to this file:
|
|
* Markus Armbruster, 2007-2008
|
|
*/
|
|
|
|
/*
|
|
* On Empire Time:
|
|
*
|
|
* An Empire turn is terminated by an update. The Empire clock counts
|
|
* turns and ETUs, i.e. it ticks etu_per_update times per turn. When
|
|
* updates move around in real time (schedule change, downtime, etc.),
|
|
* the Empire clock automatically adapts the duration of an ETU
|
|
* accordingly.
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#include <math.h>
|
|
#include "file.h"
|
|
#include "game.h"
|
|
#include "optlist.h"
|
|
#include "prototypes.h"
|
|
#include "server.h"
|
|
|
|
/*
|
|
* Disable updates
|
|
*/
|
|
void
|
|
game_ctrl_update(int enable)
|
|
{
|
|
struct gamestr *game = getgamep();
|
|
|
|
game->game_upd_disable = !enable;
|
|
putgame();
|
|
}
|
|
|
|
/*
|
|
* Are updates disabled?
|
|
*/
|
|
int
|
|
updates_disabled(void)
|
|
{
|
|
return getgamep()->game_upd_disable;
|
|
}
|
|
|
|
/*
|
|
* Notice that a player broke sanctuary.
|
|
* This starts the Empire clock if it hasn't been started yet.
|
|
*/
|
|
void
|
|
game_note_bsanct(void)
|
|
{
|
|
struct gamestr *game = getgamep();
|
|
|
|
if (game->game_rt == 0) {
|
|
game->game_rt = time(NULL);
|
|
putgame();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Record an update in the game file, the current time is NOW.
|
|
* This starts the Empire clock if it hasn't been started yet.
|
|
*/
|
|
void
|
|
game_record_update(time_t now)
|
|
{
|
|
struct gamestr *game = getgamep();
|
|
|
|
game->game_turn++;
|
|
game->game_tick = 0;
|
|
game->game_rt = now;
|
|
putgame();
|
|
}
|
|
|
|
/*
|
|
* Return current duration of an ETU in seconds.
|
|
* Note: may return HUGE_VAL when the Empire clock is not ticking.
|
|
*/
|
|
static double
|
|
secs_per_etu(struct gamestr *game)
|
|
{
|
|
double secs;
|
|
|
|
if (!game->game_rt || !update_time[0])
|
|
return HUGE_VAL; /* not started or no update scheduled */
|
|
|
|
secs = update_time[0] - game->game_rt;
|
|
if (secs < 0)
|
|
return HUGE_VAL; /* update seems to be late */
|
|
return secs / (etu_per_update - game->game_tick);
|
|
}
|
|
|
|
/*
|
|
* Update the Empire clock according to the current real time.
|
|
* Return the game struct.
|
|
*/
|
|
struct gamestr *
|
|
game_tick_tick(void)
|
|
{
|
|
struct gamestr *game = getgamep();
|
|
double dsecs, s_p_etu;
|
|
int detu;
|
|
|
|
dsecs = time(NULL) - game->game_rt;
|
|
if (CANT_HAPPEN(dsecs < 0))
|
|
dsecs = 0;
|
|
s_p_etu = secs_per_etu(game);
|
|
detu = (int)(dsecs / s_p_etu);
|
|
if (detu > 0) {
|
|
if (CANT_HAPPEN(game->game_tick + detu > etu_per_update))
|
|
detu = etu_per_update - game->game_tick;
|
|
game->game_tick += detu;
|
|
game->game_rt += detu * s_p_etu;
|
|
putgame();
|
|
}
|
|
|
|
return game;
|
|
}
|
|
|
|
/*
|
|
* Set ETU timestamp *TICK to the current ETU time.
|
|
* Return by how many ETUs it was increased.
|
|
*/
|
|
int
|
|
game_tick_to_now(short *tick)
|
|
{
|
|
return game_step_a_tick(game_tick_tick(), tick);
|
|
}
|
|
|
|
/*
|
|
* Set ETU timestamp *TICK to the ETU time recorded in the game struct.
|
|
* The Empire clock is not updated.
|
|
* Return by how many ETUs it was increased.
|
|
*/
|
|
int
|
|
game_step_a_tick(struct gamestr *game, short *tick)
|
|
{
|
|
int etu;
|
|
|
|
etu = game->game_tick - *tick;
|
|
if (CANT_HAPPEN(etu < 0))
|
|
etu = 0;
|
|
*tick = game->game_tick;
|
|
return etu;
|
|
}
|
|
|
|
/*
|
|
* Reset ETU timestamp *TICK to zero.
|
|
* Return how many ETUs it had left until etu_per_update.
|
|
*/
|
|
int
|
|
game_reset_tick(short *tick)
|
|
{
|
|
int etu;
|
|
|
|
etu = etu_per_update - *tick;
|
|
if (CANT_HAPPEN(etu < 0))
|
|
etu = 0;
|
|
*tick = 0;
|
|
return etu;
|
|
}
|