NetBSD/games/atc/update.c

424 lines
10 KiB
C

/* $NetBSD: update.c,v 1.22 2011/02/15 08:25:25 is Exp $ */
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ed James.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Copyright (c) 1987 by Ed James, UC Berkeley. All rights reserved.
*
* Copy permission is hereby granted provided that this notice is
* retained on all partial or complete copies.
*
* For more info on this and all of my stuff, mail edjames@berkeley.edu.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)update.c 8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: update.c,v 1.22 2011/02/15 08:25:25 is Exp $");
#endif
#endif /* not lint */
#include "include.h"
static int next_plane(void);
static int too_close(const PLANE *p1, const PLANE *p2, int);
static int dir_deg(int);
/* ARGSUSED */
void
update(int dummy __unused)
{
int i, dir_diff, unclean;
PLANE *pp, *p1, *p2;
#ifdef SYSV
alarm(0);
signal(SIGALRM, update);
#endif
clck++;
erase_all();
/* put some planes in the air */
do {
unclean = 0;
for (pp = ground.head; pp != NULL; pp = pp->next) {
if (pp->new_altitude > 0) {
delete(&ground, pp);
append(&air, pp);
unclean = 1;
break;
}
}
} while (unclean);
/* do altitude change and basic movement */
for (pp = air.head; pp != NULL; pp = pp->next) {
/* type 0 only move every other turn */
if (pp->plane_type == 0 && clck & 1)
continue;
pp->fuel--;
if (pp->fuel < 0)
loser(pp, "ran out of fuel.");
pp->altitude += SGN(pp->new_altitude - pp->altitude);
if (!pp->delayd) {
dir_diff = pp->new_dir - pp->dir;
/*
* Allow for circle commands
*/
if (pp->new_dir >= 0 && pp->new_dir < MAXDIR) {
if (dir_diff > MAXDIR/2)
dir_diff -= MAXDIR;
else if (dir_diff < -(MAXDIR/2))
dir_diff += MAXDIR;
}
if (dir_diff > 2)
dir_diff = 2;
else if (dir_diff < -2)
dir_diff = -2;
pp->dir += dir_diff;
if (pp->dir >= MAXDIR)
pp->dir -= MAXDIR;
else if (pp->dir < 0)
pp->dir += MAXDIR;
}
pp->xpos += displacement[pp->dir].dx;
pp->ypos += displacement[pp->dir].dy;
if (pp->delayd && pp->xpos == sp->beacon[pp->delayd_no].x &&
pp->ypos == sp->beacon[pp->delayd_no].y) {
pp->delayd = 0;
if (pp->status == S_UNMARKED)
pp->status = S_MARKED;
}
switch (pp->dest_type) {
case T_AIRPORT:
if (pp->xpos == sp->airport[pp->dest_no].x &&
pp->ypos == sp->airport[pp->dest_no].y &&
pp->altitude == 0) {
if (pp->dir != sp->airport[pp->dest_no].dir)
loser(pp, "landed in the wrong direction.");
else {
pp->status = S_GONE;
continue;
}
}
break;
case T_EXIT:
if (pp->xpos == sp->exit[pp->dest_no].x &&
pp->ypos == sp->exit[pp->dest_no].y) {
if (pp->altitude != 9)
loser(pp, "exited at the wrong altitude.");
else {
pp->status = S_GONE;
continue;
}
}
break;
default:
loser(pp, "has a bizarre destination, get help!");
}
if (pp->altitude > 9)
/* "this is impossible" */
loser(pp, "exceeded flight ceiling.");
if (pp->altitude <= 0) {
for (i = 0; i < sp->num_airports; i++)
if (pp->xpos == sp->airport[i].x &&
pp->ypos == sp->airport[i].y) {
if (pp->dest_type == T_AIRPORT)
loser(pp,
"landed at the wrong airport.");
else
loser(pp,
"landed instead of exited.");
}
loser(pp, "crashed on the ground.");
}
if (pp->xpos < 1 || pp->xpos >= sp->width - 1 ||
pp->ypos < 1 || pp->ypos >= sp->height - 1) {
for (i = 0; i < sp->num_exits; i++)
if (pp->xpos == sp->exit[i].x &&
pp->ypos == sp->exit[i].y) {
if (pp->dest_type == T_EXIT)
loser(pp,
"exited via the wrong exit.");
else
loser(pp,
"exited instead of landed.");
}
loser(pp, "illegally left the flight arena.");
}
}
/*
* Traverse the list once, deleting the planes that are gone.
*/
for (pp = air.head; pp != NULL; pp = p2) {
p2 = pp->next;
if (pp->status == S_GONE) {
safe_planes++;
delete(&air, pp);
}
}
draw_all();
for (p1 = air.head; p1 != NULL; p1 = p1->next)
for (p2 = p1->next; p2 != NULL; p2 = p2->next)
if (too_close(p1, p2, 1)) {
static char buf[80];
(void)snprintf(buf, sizeof(buf),
"collided with plane '%c'.",
name(p2));
loser(p1, buf);
}
/*
* Check every other update. Actually, only add on even updates.
* Otherwise, prop jobs show up *on* entrance. Remember that
* we don't update props on odd updates.
*/
if ((rand() % sp->newplane_time) == 0)
(void)addplane();
#ifdef SYSV
alarm(sp->update_secs);
#endif
}
const char *
command(const PLANE *pp)
{
static char buf[50], *bp, *comm_start;
size_t bpsize;
buf[0] = '\0';
bp = buf;
bpsize = sizeof(buf);
(void)snprintf(bp, bpsize, "%c%d%c%c%d: ", name(pp), pp->altitude,
(pp->fuel < LOWFUEL) ? '*' : ' ',
(pp->dest_type == T_AIRPORT) ? 'A' : 'E', pp->dest_no);
comm_start = bp = strchr(buf, '\0');
bpsize = buf + sizeof(buf) - bp;
if (pp->altitude == 0)
(void)snprintf(bp, bpsize, "Holding @ A%d", pp->orig_no);
else if (pp->new_dir >= MAXDIR || pp->new_dir < 0)
(void)snprintf(bp, bpsize, "Circle");
else if (pp->new_dir != pp->dir)
(void)snprintf(bp, bpsize, "%d", dir_deg(pp->new_dir));
bp = strchr(buf, '\0');
bpsize = buf + sizeof(buf) - bp;
if (pp->delayd)
(void)snprintf(bp, bpsize, " @ B%d", pp->delayd_no);
bp = strchr(buf, '\0');
bpsize = buf + sizeof(buf) - bp;
if (*comm_start == '\0' &&
(pp->status == S_UNMARKED || pp->status == S_IGNORED))
(void)snprintf(bp, bpsize, "---------");
return (buf);
}
char
name(const PLANE *p)
{
if (p->plane_type == 0)
return ('A' + p->plane_no);
else
return ('a' + p->plane_no);
}
int
number(int l)
{
if (islower((unsigned char)l))
return (l - 'a');
else if (isupper((unsigned char)l))
return (l - 'A');
else
return (-1);
}
static int
next_plane(void)
{
static int last_plane = -1;
PLANE *pp;
int found, start_plane = last_plane;
do {
found = 0;
last_plane++;
if (last_plane >= 26)
last_plane = 0;
for (pp = air.head; pp != NULL; pp = pp->next)
if (pp->plane_no == last_plane) {
found++;
break;
}
if (!found)
for (pp = ground.head; pp != NULL; pp = pp->next)
if (pp->plane_no == last_plane) {
found++;
break;
}
} while (found && last_plane != start_plane);
if (found)
return (-1);
return (last_plane);
}
int
addplane(void)
{
PLANE p, *pp, *p1;
int i, num_starts, isclose, rnd, rnd2, pnum;
(void)memset(&p, 0, sizeof (p));
p.status = S_MARKED;
p.plane_type = random() % 2;
num_starts = sp->num_exits + sp->num_airports;
rnd = random() % num_starts;
if (rnd < sp->num_exits) {
p.dest_type = T_EXIT;
p.dest_no = rnd;
} else {
p.dest_type = T_AIRPORT;
p.dest_no = rnd - sp->num_exits;
}
/* loop until we get a plane not near another */
for (i = 0; i < num_starts; i++) {
/* loop till we get a different start point */
while ((rnd2 = random() % num_starts) == rnd)
;
if (rnd2 < sp->num_exits) {
p.orig_type = T_EXIT;
p.orig_no = rnd2;
p.xpos = sp->exit[rnd2].x;
p.ypos = sp->exit[rnd2].y;
p.new_dir = p.dir = sp->exit[rnd2].dir;
p.altitude = p.new_altitude = 7;
isclose = 0;
for (p1 = air.head; p1 != NULL; p1 = p1->next)
if (too_close(p1, &p, 4)) {
isclose++;
break;
}
if (isclose)
continue;
} else {
p.orig_type = T_AIRPORT;
p.orig_no = rnd2 - sp->num_exits;
p.xpos = sp->airport[p.orig_no].x;
p.ypos = sp->airport[p.orig_no].y;
p.new_dir = p.dir = sp->airport[p.orig_no].dir;
p.altitude = p.new_altitude = 0;
}
p.fuel = sp->width + sp->height;
break;
}
if (i >= num_starts)
return (-1);
pnum = next_plane();
if (pnum < 0)
return (-1);
p.plane_no = pnum;
pp = newplane();
if (pp == NULL)
loser(NULL, "Out of memory!");
(void)memcpy(pp, &p, sizeof (p));
if (pp->orig_type == T_AIRPORT)
append(&ground, pp);
else
append(&air, pp);
return (pp->dest_type);
}
PLANE *
findplane(int n)
{
PLANE *pp;
for (pp = air.head; pp != NULL; pp = pp->next)
if (pp->plane_no == n)
return (pp);
for (pp = ground.head; pp != NULL; pp = pp->next)
if (pp->plane_no == n)
return (pp);
return (NULL);
}
static int
too_close(const PLANE *p1, const PLANE *p2, int dist)
{
if (ABS(p1->altitude - p2->altitude) <= dist &&
ABS(p1->xpos - p2->xpos) <= dist &&
ABS(p1->ypos - p2->ypos) <= dist)
return (1);
else
return (0);
}
static int
dir_deg(int d)
{
switch (d) {
case 0: return (0);
case 1: return (45);
case 2: return (90);
case 3: return (135);
case 4: return (180);
case 5: return (225);
case 6: return (270);
case 7: return (315);
default:
return (-1);
}
}