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- /*-
- * Copyright (c) 1990 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. 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.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)update.c 5.5 (Berkeley) 10/30/90";
- #endif not lint
-
- #include "include.h"
-
- update()
- {
- int i, dir_diff, mask, unclean;
- PLANE *pp, *p1, *p2, *p;
-
- #ifdef BSD
- mask = sigblock(sigmask(SIGINT));
- #endif
- #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, "exceded 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)sprintf(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)
- addplane();
-
- #ifdef BSD
- sigsetmask(mask);
- #endif
- #ifdef SYSV
- alarm(sp->update_secs);
- #endif
- }
-
- char *
- command(pp)
- PLANE *pp;
- {
- static char buf[50], *bp, *comm_start;
- char *index();
-
- buf[0] = '\0';
- bp = buf;
- (void)sprintf(bp, "%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 = index(buf, '\0');
- if (pp->altitude == 0)
- (void)sprintf(bp, "Holding @ A%d", pp->orig_no);
- else if (pp->new_dir >= MAXDIR || pp->new_dir < 0)
- strcpy(bp, "Circle");
- else if (pp->new_dir != pp->dir)
- (void)sprintf(bp, "%d", dir_deg(pp->new_dir));
-
- bp = index(buf, '\0');
- if (pp->delayd)
- (void)sprintf(bp, " @ B%d", pp->delayd_no);
-
- bp = index(buf, '\0');
- if (*comm_start == '\0' &&
- (pp->status == S_UNMARKED || pp->status == S_IGNORED))
- strcpy(bp, "---------");
- return (buf);
- }
-
- /* char */
- name(p)
- PLANE *p;
- {
- if (p->plane_type == 0)
- return ('A' + p->plane_no);
- else
- return ('a' + p->plane_no);
- }
-
- number(l)
- {
- if (l < 'a' && l > 'z' && l < 'A' && l > 'Z')
- return (-1);
- else if (l >= 'a' && l <= 'z')
- return (l - 'a');
- else
- return (l - 'A');
- }
-
- next_plane()
- {
- 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 (last_plane == start_plane)
- return (-1);
- return (last_plane);
- }
-
- addplane()
- {
- PLANE p, *pp, *p1;
- int i, num_starts, close, rnd, rnd2, pnum;
-
- bzero(&p, 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;
- close = 0;
- for (p1 = air.head; p1 != NULL; p1 = p1->next)
- if (too_close(p1, &p, 4)) {
- close++;
- break;
- }
- if (close)
- 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();
- bcopy(&p, pp, sizeof (p));
-
- if (pp->orig_type == T_AIRPORT)
- append(&ground, pp);
- else
- append(&air, pp);
-
- return (pp->dest_type);
- }
-
- PLANE *
- findplane(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);
- }
-
- too_close(p1, p2, dist)
- PLANE *p1, *p2;
- {
- if (ABS(p1->altitude - p2->altitude) <= dist &&
- ABS(p1->xpos - p2->xpos) <= dist && ABS(p1->ypos - p2->ypos) <= dist)
- return (1);
- else
- return (0);
- }
-
- dir_deg(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);
- }
- }
-