414 lines
9.8 KiB
C
414 lines
9.8 KiB
C
/* $NetBSD: update.c,v 1.17 2006/03/22 15:24:52 christos Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Ed James.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1987 by Ed James, UC Berkeley. All rights reserved.
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*
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* Copy permission is hereby granted provided that this notice is
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* retained on all partial or complete copies.
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*
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* For more info on this and all of my stuff, mail edjames@berkeley.edu.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)update.c 8.1 (Berkeley) 5/31/93";
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#else
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__RCSID("$NetBSD: update.c,v 1.17 2006/03/22 15:24:52 christos Exp $");
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#endif
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#endif /* not lint */
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#include "include.h"
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/* ARGSUSED */
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void
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update(int dummy __attribute__((__unused__)))
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{
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int i, dir_diff, unclean;
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PLANE *pp, *p1, *p2;
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#ifdef SYSV
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alarm(0);
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signal(SIGALRM, update);
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#endif
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clck++;
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erase_all();
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/* put some planes in the air */
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do {
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unclean = 0;
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for (pp = ground.head; pp != NULL; pp = pp->next) {
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if (pp->new_altitude > 0) {
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delete(&ground, pp);
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append(&air, pp);
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unclean = 1;
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break;
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}
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}
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} while (unclean);
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/* do altitude change and basic movement */
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for (pp = air.head; pp != NULL; pp = pp->next) {
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/* type 0 only move every other turn */
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if (pp->plane_type == 0 && clck & 1)
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continue;
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pp->fuel--;
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if (pp->fuel < 0)
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loser(pp, "ran out of fuel.");
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pp->altitude += SGN(pp->new_altitude - pp->altitude);
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if (!pp->delayd) {
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dir_diff = pp->new_dir - pp->dir;
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/*
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* Allow for circle commands
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*/
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if (pp->new_dir >= 0 && pp->new_dir < MAXDIR) {
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if (dir_diff > MAXDIR/2)
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dir_diff -= MAXDIR;
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else if (dir_diff < -(MAXDIR/2))
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dir_diff += MAXDIR;
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}
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if (dir_diff > 2)
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dir_diff = 2;
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else if (dir_diff < -2)
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dir_diff = -2;
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pp->dir += dir_diff;
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if (pp->dir >= MAXDIR)
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pp->dir -= MAXDIR;
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else if (pp->dir < 0)
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pp->dir += MAXDIR;
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}
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pp->xpos += displacement[pp->dir].dx;
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pp->ypos += displacement[pp->dir].dy;
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if (pp->delayd && pp->xpos == sp->beacon[pp->delayd_no].x &&
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pp->ypos == sp->beacon[pp->delayd_no].y) {
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pp->delayd = 0;
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if (pp->status == S_UNMARKED)
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pp->status = S_MARKED;
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}
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switch (pp->dest_type) {
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case T_AIRPORT:
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if (pp->xpos == sp->airport[pp->dest_no].x &&
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pp->ypos == sp->airport[pp->dest_no].y &&
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pp->altitude == 0) {
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if (pp->dir != sp->airport[pp->dest_no].dir)
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loser(pp, "landed in the wrong direction.");
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else {
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pp->status = S_GONE;
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continue;
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}
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}
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break;
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case T_EXIT:
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if (pp->xpos == sp->exit[pp->dest_no].x &&
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pp->ypos == sp->exit[pp->dest_no].y) {
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if (pp->altitude != 9)
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loser(pp, "exited at the wrong altitude.");
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else {
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pp->status = S_GONE;
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continue;
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}
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}
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break;
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default:
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loser(pp, "has a bizarre destination, get help!");
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}
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if (pp->altitude > 9)
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/* "this is impossible" */
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loser(pp, "exceded flight ceiling.");
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if (pp->altitude <= 0) {
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for (i = 0; i < sp->num_airports; i++)
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if (pp->xpos == sp->airport[i].x &&
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pp->ypos == sp->airport[i].y) {
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if (pp->dest_type == T_AIRPORT)
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loser(pp,
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"landed at the wrong airport.");
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else
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loser(pp,
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"landed instead of exited.");
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}
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loser(pp, "crashed on the ground.");
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}
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if (pp->xpos < 1 || pp->xpos >= sp->width - 1 ||
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pp->ypos < 1 || pp->ypos >= sp->height - 1) {
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for (i = 0; i < sp->num_exits; i++)
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if (pp->xpos == sp->exit[i].x &&
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pp->ypos == sp->exit[i].y) {
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if (pp->dest_type == T_EXIT)
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loser(pp,
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"exited via the wrong exit.");
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else
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loser(pp,
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"exited instead of landed.");
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}
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loser(pp, "illegally left the flight arena.");
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}
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}
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/*
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* Traverse the list once, deleting the planes that are gone.
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*/
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for (pp = air.head; pp != NULL; pp = p2) {
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p2 = pp->next;
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if (pp->status == S_GONE) {
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safe_planes++;
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delete(&air, pp);
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}
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}
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draw_all();
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for (p1 = air.head; p1 != NULL; p1 = p1->next)
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for (p2 = p1->next; p2 != NULL; p2 = p2->next)
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if (too_close(p1, p2, 1)) {
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static char buf[80];
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(void)sprintf(buf, "collided with plane '%c'.",
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name(p2));
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loser(p1, buf);
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}
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/*
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* Check every other update. Actually, only add on even updates.
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* Otherwise, prop jobs show up *on* entrance. Remember that
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* we don't update props on odd updates.
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*/
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if ((rand() % sp->newplane_time) == 0)
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(void)addplane();
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#ifdef SYSV
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alarm(sp->update_secs);
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#endif
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}
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const char *
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command(const PLANE *pp)
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{
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static char buf[50], *bp, *comm_start;
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buf[0] = '\0';
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bp = buf;
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(void)sprintf(bp, "%c%d%c%c%d: ", name(pp), pp->altitude,
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(pp->fuel < LOWFUEL) ? '*' : ' ',
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(pp->dest_type == T_AIRPORT) ? 'A' : 'E', pp->dest_no);
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comm_start = bp = strchr(buf, '\0');
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if (pp->altitude == 0)
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(void)sprintf(bp, "Holding @ A%d", pp->orig_no);
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else if (pp->new_dir >= MAXDIR || pp->new_dir < 0)
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(void)strcpy(bp, "Circle");
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else if (pp->new_dir != pp->dir)
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(void)sprintf(bp, "%d", dir_deg(pp->new_dir));
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bp = strchr(buf, '\0');
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if (pp->delayd)
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(void)sprintf(bp, " @ B%d", pp->delayd_no);
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bp = strchr(buf, '\0');
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if (*comm_start == '\0' &&
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(pp->status == S_UNMARKED || pp->status == S_IGNORED))
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(void)strcpy(bp, "---------");
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return (buf);
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}
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char
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name(const PLANE *p)
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{
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if (p->plane_type == 0)
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return ('A' + p->plane_no);
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else
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return ('a' + p->plane_no);
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}
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int
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number(int l)
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{
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if (islower((unsigned char)l))
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return (l - 'a');
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else if (isupper((unsigned char)l))
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return (l - 'A');
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else
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return (-1);
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}
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int
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next_plane(void)
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{
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static int last_plane = -1;
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PLANE *pp;
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int found, start_plane = last_plane;
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do {
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found = 0;
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last_plane++;
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if (last_plane >= 26)
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last_plane = 0;
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for (pp = air.head; pp != NULL; pp = pp->next)
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if (pp->plane_no == last_plane) {
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found++;
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break;
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}
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if (!found)
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for (pp = ground.head; pp != NULL; pp = pp->next)
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if (pp->plane_no == last_plane) {
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found++;
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break;
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}
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} while (found && last_plane != start_plane);
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if (last_plane == start_plane)
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return (-1);
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return (last_plane);
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}
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int
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addplane(void)
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{
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PLANE p, *pp, *p1;
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int i, num_starts, isclose, rnd, rnd2, pnum;
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(void)memset(&p, 0, sizeof (p));
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p.status = S_MARKED;
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p.plane_type = random() % 2;
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num_starts = sp->num_exits + sp->num_airports;
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rnd = random() % num_starts;
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if (rnd < sp->num_exits) {
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p.dest_type = T_EXIT;
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p.dest_no = rnd;
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} else {
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p.dest_type = T_AIRPORT;
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p.dest_no = rnd - sp->num_exits;
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}
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/* loop until we get a plane not near another */
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for (i = 0; i < num_starts; i++) {
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/* loop till we get a different start point */
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while ((rnd2 = random() % num_starts) == rnd)
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;
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if (rnd2 < sp->num_exits) {
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p.orig_type = T_EXIT;
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p.orig_no = rnd2;
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p.xpos = sp->exit[rnd2].x;
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p.ypos = sp->exit[rnd2].y;
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p.new_dir = p.dir = sp->exit[rnd2].dir;
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p.altitude = p.new_altitude = 7;
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isclose = 0;
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for (p1 = air.head; p1 != NULL; p1 = p1->next)
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if (too_close(p1, &p, 4)) {
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isclose++;
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break;
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}
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if (isclose)
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continue;
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} else {
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p.orig_type = T_AIRPORT;
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p.orig_no = rnd2 - sp->num_exits;
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p.xpos = sp->airport[p.orig_no].x;
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p.ypos = sp->airport[p.orig_no].y;
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p.new_dir = p.dir = sp->airport[p.orig_no].dir;
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p.altitude = p.new_altitude = 0;
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}
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p.fuel = sp->width + sp->height;
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break;
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}
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if (i >= num_starts)
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return (-1);
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pnum = next_plane();
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if (pnum < 0)
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return (-1);
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p.plane_no = pnum;
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pp = newplane();
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if (pp == NULL)
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loser(NULL, "Out of memory!");
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(void)memcpy(pp, &p, sizeof (p));
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if (pp->orig_type == T_AIRPORT)
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append(&ground, pp);
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else
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append(&air, pp);
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return (pp->dest_type);
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}
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PLANE *
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findplane(int n)
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{
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PLANE *pp;
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for (pp = air.head; pp != NULL; pp = pp->next)
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if (pp->plane_no == n)
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return (pp);
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for (pp = ground.head; pp != NULL; pp = pp->next)
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if (pp->plane_no == n)
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return (pp);
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return (NULL);
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}
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int
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too_close(const PLANE *p1, const PLANE *p2, int dist)
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{
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if (ABS(p1->altitude - p2->altitude) <= dist &&
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ABS(p1->xpos - p2->xpos) <= dist &&
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ABS(p1->ypos - p2->ypos) <= dist)
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return (1);
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else
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return (0);
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}
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int
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dir_deg(int d)
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{
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switch (d) {
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case 0: return (0);
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case 1: return (45);
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case 2: return (90);
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case 3: return (135);
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case 4: return (180);
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case 5: return (225);
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case 6: return (270);
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case 7: return (315);
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default:
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return (-1);
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}
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}
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