atc/update.c

   1 /*      $NetBSD: update.c,v 1.14 2005/08/10 17:53:28 rpaulo Exp $       */
   2
   3 /*-
   4  * Copyright (c) 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Ed James.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 /*
  36  * Copyright (c) 1987 by Ed James, UC Berkeley.  All rights reserved.
  37  *
  38  * Copy permission is hereby granted provided that this notice is
  39  * retained on all partial or complete copies.
  40  *
  41  * For more info on this and all of my stuff, mail edjames@berkeley.edu.
  42  */
  43
  44 #include <sys/cdefs.h>
  45 #ifndef lint
  46 #if 0
  47 static char sccsid[] = "@(#)update.c    8.1 (Berkeley) 5/31/93";
  48 #else
  49 __RCSID("$NetBSD: update.c,v 1.14 2005/08/10 17:53:28 rpaulo Exp $");
  50 #endif
  51 #endif /* not lint */
  52
  53 #include "include.h"
  54
  55 /* ARGSUSED */
  56 void
  57 update(int dummy __attribute__((__unused__)))
  58 {
  59         int     i, dir_diff, unclean;
  60         PLANE   *pp, *p1, *p2;
  61
  62 #ifdef SYSV
  63         alarm(0);
  64         signal(SIGALRM, update);
  65 #endif
  66
  67         clck++;
  68
  69         erase_all();
  70
  71         /* put some planes in the air */
  72         do {
  73                 unclean = 0;
  74                 for (pp = ground.head; pp != NULL; pp = pp->next) {
  75                         if (pp->new_altitude > 0) {
  76                                 delete(&ground, pp);
  77                                 append(&air, pp);
  78                                 unclean = 1;
  79                                 break;
  80                         }
  81                 }
  82         } while (unclean);
  83
  84         /* do altitude change and basic movement */
  85         for (pp = air.head; pp != NULL; pp = pp->next) {
  86                 /* type 0 only move every other turn */
  87                 if (pp->plane_type == 0 && clck & 1)
  88                         continue;
  89
  90                 pp->fuel--;
  91                 if (pp->fuel < 0)
  92                         loser(pp, "ran out of fuel.");
  93
  94                 pp->altitude += SGN(pp->new_altitude - pp->altitude);
  95
  96                 if (!pp->delayd) {
  97                         dir_diff = pp->new_dir - pp->dir;
  98                         /*
  99                          * Allow for circle commands
 100                          */
 101                         if (pp->new_dir >= 0 && pp->new_dir < MAXDIR) {
 102                                 if (dir_diff > MAXDIR/2)
 103                                         dir_diff -= MAXDIR;
 104                                 else if (dir_diff < -(MAXDIR/2))
 105                                         dir_diff += MAXDIR;
 106                         }
 107                         if (dir_diff > 2)
 108                                 dir_diff = 2;
 109                         else if (dir_diff < -2)
 110                                 dir_diff = -2;
 111                         pp->dir += dir_diff;
 112                         if (pp->dir >= MAXDIR)
 113                                 pp->dir -= MAXDIR;
 114                         else if (pp->dir < 0)
 115                                 pp->dir += MAXDIR;
 116                 }
 117                 pp->xpos += displacement[pp->dir].dx;
 118                 pp->ypos += displacement[pp->dir].dy;
 119
 120                 if (pp->delayd && pp->xpos == sp->beacon[pp->delayd_no].x &&
 121                     pp->ypos == sp->beacon[pp->delayd_no].y) {
 122                         pp->delayd = 0;
 123                         if (pp->status == S_UNMARKED)
 124                                 pp->status = S_MARKED;
 125                 }
 126
 127                 switch (pp->dest_type) {
 128                 case T_AIRPORT:
 129                         if (pp->xpos == sp->airport[pp->dest_no].x &&
 130                             pp->ypos == sp->airport[pp->dest_no].y &&
 131                             pp->altitude == 0) {
 132                                 if (pp->dir != sp->airport[pp->dest_no].dir)
 133                                     loser(pp, "landed in the wrong direction.");
 134                                 else {
 135                                     pp->status = S_GONE;
 136                                     continue;
 137                                 }
 138                         }
 139                         break;
 140                 case T_EXIT:
 141                         if (pp->xpos == sp->exit[pp->dest_no].x &&
 142                             pp->ypos == sp->exit[pp->dest_no].y) {
 143                                 if (pp->altitude != 9)
 144                                     loser(pp, "exited at the wrong altitude.");
 145                                 else {
 146                                     pp->status = S_GONE;
 147                                     continue;
 148                                 }
 149                         }
 150                         break;
 151                 default:
 152                         loser(pp, "has a bizarre destination, get help!");
 153                 }
 154                 if (pp->altitude > 9)
 155                         /* "this is impossible" */
 156                         loser(pp, "exceded flight ceiling.");
 157                 if (pp->altitude <= 0) {
 158                         for (i = 0; i < sp->num_airports; i++)
 159                                 if (pp->xpos == sp->airport[i].x &&
 160                                     pp->ypos == sp->airport[i].y) {
 161                                         if (pp->dest_type == T_AIRPORT)
 162                                             loser(pp,
 163                                                 "landed at the wrong airport.");
 164                                         else
 165                                             loser(pp,
 166                                                 "landed instead of exited.");
 167                                 }
 168                         loser(pp, "crashed on the ground.");
 169                 }
 170                 if (pp->xpos < 1 || pp->xpos >= sp->width - 1 ||
 171                     pp->ypos < 1 || pp->ypos >= sp->height - 1) {
 172                         for (i = 0; i < sp->num_exits; i++)
 173                                 if (pp->xpos == sp->exit[i].x &&
 174                                     pp->ypos == sp->exit[i].y) {
 175                                         if (pp->dest_type == T_EXIT)
 176                                             loser(pp,
 177                                                 "exited via the wrong exit.");
 178                                         else
 179                                             loser(pp,
 180                                                 "exited instead of landed.");
 181                                 }
 182                         loser(pp, "illegally left the flight arena.");
 183                 }
 184         }
 185
 186         /*
 187          * Traverse the list once, deleting the planes that are gone.
 188          */
 189         for (pp = air.head; pp != NULL; pp = p2) {
 190                 p2 = pp->next;
 191                 if (pp->status == S_GONE) {
 192                         safe_planes++;
 193                         delete(&air, pp);
 194                 }
 195         }
 196
 197         draw_all();
 198
 199         for (p1 = air.head; p1 != NULL; p1 = p1->next)
 200                 for (p2 = p1->next; p2 != NULL; p2 = p2->next)
 201                         if (too_close(p1, p2, 1)) {
 202                                 static char     buf[80];
 203
 204                                 (void)sprintf(buf, "collided with plane '%c'.",
 205                                         name(p2));
 206                                 loser(p1, buf);
 207                         }
 208         /*
 209          * Check every other update.  Actually, only add on even updates.
 210          * Otherwise, prop jobs show up *on* entrance.  Remember that
 211          * we don't update props on odd updates.
 212          */
 213         if ((rand() % sp->newplane_time) == 0)
 214                 (void)addplane();
 215
 216 #ifdef SYSV
 217         alarm(sp->update_secs);
 218 #endif
 219 }
 220
 221 const char *
 222 command(const PLANE *pp)
 223 {
 224         static char     buf[50], *bp, *comm_start;
 225
 226         buf[0] = '\0';
 227         bp = buf;
 228         (void)sprintf(bp, "%c%d%c%c%d: ", name(pp), pp->altitude,
 229                 (pp->fuel < LOWFUEL) ? '*' : ' ',
 230                 (pp->dest_type == T_AIRPORT) ? 'A' : 'E', pp->dest_no);
 231
 232         comm_start = bp = strchr(buf, '\0');
 233         if (pp->altitude == 0)
 234                 (void)sprintf(bp, "Holding @ A%d", pp->orig_no);
 235         else if (pp->new_dir >= MAXDIR || pp->new_dir < 0)
 236                 (void)strcpy(bp, "Circle");
 237         else if (pp->new_dir != pp->dir)
 238                 (void)sprintf(bp, "%d", dir_deg(pp->new_dir));
 239
 240         bp = strchr(buf, '\0');
 241         if (pp->delayd)
 242                 (void)sprintf(bp, " @ B%d", pp->delayd_no);
 243
 244         bp = strchr(buf, '\0');
 245         if (*comm_start == '\0' &&
 246             (pp->status == S_UNMARKED || pp->status == S_IGNORED))
 247                 (void)strcpy(bp, "---------");
 248         return (buf);
 249 }
 250
 251 char
 252 name(const PLANE *p)
 253 {
 254         if (p->plane_type == 0)
 255                 return ('A' + p->plane_no);
 256         else
 257                 return ('a' + p->plane_no);
 258 }
 259
 260 int
 261 number(int l)
 262 {
 263         if (l < 'a' && l > 'z' && l < 'A' && l > 'Z')
 264                 return (-1);
 265         else if (l >= 'a' && l <= 'z')
 266                 return (l - 'a');
 267         else
 268                 return (l - 'A');
 269 }
 270
 271 int
 272 next_plane(void)
 273 {
 274         static int      last_plane = -1;
 275         PLANE           *pp;
 276         int             found, start_plane = last_plane;
 277
 278         do {
 279                 found = 0;
 280                 last_plane++;
 281                 if (last_plane >= 26)
 282                         last_plane = 0;
 283                 for (pp = air.head; pp != NULL; pp = pp->next)
 284                         if (pp->plane_no == last_plane) {
 285                                 found++;
 286                                 break;
 287                         }
 288                 if (!found)
 289                         for (pp = ground.head; pp != NULL; pp = pp->next)
 290                                 if (pp->plane_no == last_plane) {
 291                                         found++;
 292                                         break;
 293                                 }
 294         } while (found && last_plane != start_plane);
 295         if (last_plane == start_plane)
 296                 return (-1);
 297         return (last_plane);
 298 }
 299
 300 int
 301 addplane(void)
 302 {
 303         PLANE   p, *pp, *p1;
 304         int     i, num_starts, isclose, rnd, rnd2, pnum;
 305
 306         (void)memset(&p, 0, sizeof (p));
 307
 308         p.status = S_MARKED;
 309         p.plane_type = random() % 2;
 310
 311         num_starts = sp->num_exits + sp->num_airports;
 312         rnd = random() % num_starts;
 313
 314         if (rnd < sp->num_exits) {
 315                 p.dest_type = T_EXIT;
 316                 p.dest_no = rnd;
 317         } else {
 318                 p.dest_type = T_AIRPORT;
 319                 p.dest_no = rnd - sp->num_exits;
 320         }
 321
 322         /* loop until we get a plane not near another */
 323         for (i = 0; i < num_starts; i++) {
 324                 /* loop till we get a different start point */
 325                 while ((rnd2 = random() % num_starts) == rnd)
 326                         ;
 327                 if (rnd2 < sp->num_exits) {
 328                         p.orig_type = T_EXIT;
 329                         p.orig_no = rnd2;
 330                         p.xpos = sp->exit[rnd2].x;
 331                         p.ypos = sp->exit[rnd2].y;
 332                         p.new_dir = p.dir = sp->exit[rnd2].dir;
 333                         p.altitude = p.new_altitude = 7;
 334                         isclose = 0;
 335                         for (p1 = air.head; p1 != NULL; p1 = p1->next)
 336                                 if (too_close(p1, &p, 4)) {
 337                                         isclose++;
 338                                         break;
 339                                 }
 340                         if (isclose)
 341                                 continue;
 342                 } else {
 343                         p.orig_type = T_AIRPORT;
 344                         p.orig_no = rnd2 - sp->num_exits;
 345                         p.xpos = sp->airport[p.orig_no].x;
 346                         p.ypos = sp->airport[p.orig_no].y;
 347                         p.new_dir = p.dir = sp->airport[p.orig_no].dir;
 348                         p.altitude = p.new_altitude = 0;
 349                 }
 350                 p.fuel = sp->width + sp->height;
 351                 break;
 352         }
 353         if (i >= num_starts)
 354                 return (-1);
 355         pnum = next_plane();
 356         if (pnum < 0)
 357                 return (-1);
 358         p.plane_no = pnum;
 359
 360         pp = newplane();
 361         if (pp == NULL)
 362                 loser(NULL, "Out of memory!");
 363         (void)memcpy(pp, &p, sizeof (p));
 364
 365         if (pp->orig_type == T_AIRPORT)
 366                 append(&ground, pp);
 367         else
 368                 append(&air, pp);
 369
 370         return (pp->dest_type);
 371 }
 372
 373 PLANE *
 374 findplane(int n)
 375 {
 376         PLANE   *pp;
 377
 378         for (pp = air.head; pp != NULL; pp = pp->next)
 379                 if (pp->plane_no == n)
 380                         return (pp);
 381         for (pp = ground.head; pp != NULL; pp = pp->next)
 382                 if (pp->plane_no == n)
 383                         return (pp);
 384         return (NULL);
 385 }
 386
 387 int
 388 too_close(const PLANE *p1, const PLANE *p2, int dist)
 389 {
 390         if (ABS(p1->altitude - p2->altitude) <= dist &&
 391             ABS(p1->xpos - p2->xpos) <= dist &&
 392             ABS(p1->ypos - p2->ypos) <= dist)
 393                 return (1);
 394         else
 395                 return (0);
 396 }
 397
 398 int
 399 dir_deg(int d)
 400 {
 401         switch (d) {
 402         case 0: return (0);
 403         case 1: return (45);
 404         case 2: return (90);
 405         case 3: return (135);
 406         case 4: return (180);
 407         case 5: return (225);
 408         case 6: return (270);
 409         case 7: return (315);
 410         default:
 411                 return (-1);
 412         }
 413 }