1 /* $OpenBSD: update.c,v 1.11 2006/03/31 10:32:30 otto 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 #ifndef lint 45 #if 0 46 static char sccsid[] = "@(#)update.c 8.1 (Berkeley) 5/31/93"; 47 #else 48 static char rcsid[] = "$OpenBSD: update.c,v 1.11 2006/03/31 10:32:30 otto Exp $"; 49 #endif 50 #endif /* not lint */ 51 52 #include "include.h" 53 54 void 55 update(int dummy) 56 { 57 int i, dir_diff, unclean; 58 PLANE *pp, *p1, *p2; 59 60 #ifdef SYSV 61 alarm(0); 62 signal(SIGALRM, update); 63 #endif 64 65 clck++; 66 67 erase_all(); 68 69 /* put some planes in the air */ 70 do { 71 unclean = 0; 72 for (pp = ground.head; pp != NULL; pp = pp->next) { 73 if (pp->new_altitude > 0) { 74 delete(&ground, pp); 75 append(&air, pp); 76 unclean = 1; 77 break; 78 } 79 } 80 } while (unclean); 81 82 /* do altitude change and basic movement */ 83 for (pp = air.head; pp != NULL; pp = pp->next) { 84 /* type 0 only move every other turn */ 85 if (pp->plane_type == 0 && clck & 1) 86 continue; 87 88 pp->fuel--; 89 if (pp->fuel < 0) 90 loser(pp, "ran out of fuel."); 91 92 pp->altitude += SGN(pp->new_altitude - pp->altitude); 93 94 if (!pp->delayd) { 95 dir_diff = pp->new_dir - pp->dir; 96 /* 97 * Allow for circle commands 98 */ 99 if (pp->new_dir >= 0 && pp->new_dir < MAXDIR) { 100 if (dir_diff > MAXDIR/2) 101 dir_diff -= MAXDIR; 102 else if (dir_diff < -(MAXDIR/2)) 103 dir_diff += MAXDIR; 104 } 105 if (dir_diff > 2) 106 dir_diff = 2; 107 else if (dir_diff < -2) 108 dir_diff = -2; 109 pp->dir += dir_diff; 110 if (pp->dir >= MAXDIR) 111 pp->dir -= MAXDIR; 112 else if (pp->dir < 0) 113 pp->dir += MAXDIR; 114 } 115 pp->xpos += displacement[pp->dir].dx; 116 pp->ypos += displacement[pp->dir].dy; 117 118 if (pp->delayd && pp->xpos == sp->beacon[pp->delayd_no].x && 119 pp->ypos == sp->beacon[pp->delayd_no].y) { 120 pp->delayd = 0; 121 if (pp->status == S_UNMARKED) 122 pp->status = S_MARKED; 123 } 124 125 switch (pp->dest_type) { 126 case T_AIRPORT: 127 if (pp->xpos == sp->airport[pp->dest_no].x && 128 pp->ypos == sp->airport[pp->dest_no].y && 129 pp->altitude == 0) { 130 if (pp->dir != sp->airport[pp->dest_no].dir) 131 loser(pp, "landed in the wrong direction."); 132 else { 133 pp->status = S_GONE; 134 continue; 135 } 136 } 137 break; 138 case T_EXIT: 139 if (pp->xpos == sp->exit[pp->dest_no].x && 140 pp->ypos == sp->exit[pp->dest_no].y) { 141 if (pp->altitude != 9) 142 loser(pp, "exited at the wrong altitude."); 143 else { 144 pp->status = S_GONE; 145 continue; 146 } 147 } 148 break; 149 default: 150 loser(pp, "has a bizarre destination, get help!"); 151 } 152 if (pp->altitude > 9) 153 /* "this is impossible" */ 154 loser(pp, "exceeded flight ceiling."); 155 if (pp->altitude <= 0) { 156 for (i = 0; i < sp->num_airports; i++) 157 if (pp->xpos == sp->airport[i].x && 158 pp->ypos == sp->airport[i].y) { 159 if (pp->dest_type == T_AIRPORT) 160 loser(pp, 161 "landed at the wrong airport."); 162 else 163 loser(pp, 164 "landed instead of exited."); 165 } 166 loser(pp, "crashed on the ground."); 167 } 168 if (pp->xpos < 1 || pp->xpos >= sp->width - 1 || 169 pp->ypos < 1 || pp->ypos >= sp->height - 1) { 170 for (i = 0; i < sp->num_exits; i++) 171 if (pp->xpos == sp->exit[i].x && 172 pp->ypos == sp->exit[i].y) { 173 if (pp->dest_type == T_EXIT) 174 loser(pp, 175 "exited via the wrong exit."); 176 else 177 loser(pp, 178 "exited instead of landed."); 179 } 180 loser(pp, "illegally left the flight arena."); 181 } 182 } 183 184 /* 185 * Traverse the list once, deleting the planes that are gone. 186 */ 187 for (pp = air.head; pp != NULL; pp = p2) { 188 p2 = pp->next; 189 if (pp->status == S_GONE) { 190 safe_planes++; 191 delete(&air, pp); 192 } 193 } 194 195 draw_all(); 196 197 for (p1 = air.head; p1 != NULL; p1 = p1->next) 198 for (p2 = p1->next; p2 != NULL; p2 = p2->next) 199 if (too_close(p1, p2, 1)) { 200 static char buf[80]; 201 202 (void)snprintf(buf, sizeof buf, 203 "collided with plane '%c'.", 204 name(p2)); 205 loser(p1, buf); 206 } 207 /* 208 * Check every other update. Actually, only add on even updates. 209 * Otherwise, prop jobs show up *on* entrance. Remember that 210 * we don't update props on odd updates. 211 */ 212 if ((random() % sp->newplane_time) == 0) 213 addplane(); 214 215 #ifdef SYSV 216 alarm(sp->update_secs); 217 #endif 218 } 219 220 const char * 221 command(PLANE *pp) 222 { 223 static char buf[50], *bp, *comm_start; 224 225 buf[0] = '\0'; 226 bp = buf; 227 (void)snprintf(bp, buf + sizeof buf - bp, 228 "%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)snprintf(bp, buf + sizeof buf - bp, 235 "Holding @ A%d", pp->orig_no); 236 else if (pp->new_dir >= MAXDIR || pp->new_dir < 0) 237 strlcpy(bp, "Circle", buf + sizeof buf - bp); 238 else if (pp->new_dir != pp->dir) 239 (void)snprintf(bp, buf + sizeof buf - bp, 240 "%d", dir_deg(pp->new_dir)); 241 242 bp = strchr(buf, '\0'); 243 if (pp->delayd) 244 (void)snprintf(bp, buf + sizeof buf - bp, 245 " @ B%d", pp->delayd_no); 246 247 bp = strchr(buf, '\0'); 248 if (*comm_start == '\0' && 249 (pp->status == S_UNMARKED || pp->status == S_IGNORED)) 250 strlcpy(bp, "---------", buf + sizeof buf - bp); 251 return (buf); 252 } 253 254 char 255 name(const PLANE *p) 256 { 257 if (p->plane_type == 0) 258 return ('A' + p->plane_no); 259 else 260 return ('a' + p->plane_no); 261 } 262 263 int 264 number(char l) 265 { 266 if (l >= 'a' && l <= 'z') 267 return (l - 'a'); 268 else if (l >= 'A' && l <= 'Z') 269 return (l - 'A'); 270 else 271 return (-1); 272 } 273 274 int 275 next_plane(void) 276 { 277 static int last_plane = -1; 278 PLANE *pp; 279 int found, start_plane = last_plane; 280 281 do { 282 found = 0; 283 last_plane++; 284 if (last_plane >= 26) 285 last_plane = 0; 286 for (pp = air.head; pp != NULL; pp = pp->next) 287 if (pp->plane_no == last_plane) { 288 found++; 289 break; 290 } 291 if (!found) 292 for (pp = ground.head; pp != NULL; pp = pp->next) 293 if (pp->plane_no == last_plane) { 294 found++; 295 break; 296 } 297 } while (found && last_plane != start_plane); 298 if (last_plane == start_plane) 299 return (-1); 300 return (last_plane); 301 } 302 303 int 304 addplane(void) 305 { 306 PLANE p, *pp, *p1; 307 int i, num_starts, close, rnd, rnd2, pnum; 308 309 memset(&p, 0, sizeof (p)); 310 311 p.status = S_MARKED; 312 p.plane_type = random() % 2; 313 314 num_starts = sp->num_exits + sp->num_airports; 315 rnd = random() % num_starts; 316 317 if (rnd < sp->num_exits) { 318 p.dest_type = T_EXIT; 319 p.dest_no = rnd; 320 } else { 321 p.dest_type = T_AIRPORT; 322 p.dest_no = rnd - sp->num_exits; 323 } 324 325 /* loop until we get a plane not near another */ 326 for (i = 0; i < num_starts; i++) { 327 /* loop till we get a different start point */ 328 while ((rnd2 = random() % num_starts) == rnd) 329 ; 330 if (rnd2 < sp->num_exits) { 331 p.orig_type = T_EXIT; 332 p.orig_no = rnd2; 333 p.xpos = sp->exit[rnd2].x; 334 p.ypos = sp->exit[rnd2].y; 335 p.new_dir = p.dir = sp->exit[rnd2].dir; 336 p.altitude = p.new_altitude = 7; 337 close = 0; 338 for (p1 = air.head; p1 != NULL; p1 = p1->next) 339 if (too_close(p1, &p, 4)) { 340 close++; 341 break; 342 } 343 if (close) 344 continue; 345 } else { 346 p.orig_type = T_AIRPORT; 347 p.orig_no = rnd2 - sp->num_exits; 348 p.xpos = sp->airport[p.orig_no].x; 349 p.ypos = sp->airport[p.orig_no].y; 350 p.new_dir = p.dir = sp->airport[p.orig_no].dir; 351 p.altitude = p.new_altitude = 0; 352 } 353 p.fuel = sp->width + sp->height; 354 break; 355 } 356 if (i >= num_starts) 357 return (-1); 358 pnum = next_plane(); 359 if (pnum < 0) 360 return (-1); 361 p.plane_no = pnum; 362 363 pp = newplane(); 364 memcpy(pp, &p, sizeof (p)); 365 366 if (pp->orig_type == T_AIRPORT) 367 append(&ground, pp); 368 else 369 append(&air, pp); 370 371 return (pp->dest_type); 372 } 373 374 PLANE * 375 findplane(int n) 376 { 377 PLANE *pp; 378 379 for (pp = air.head; pp != NULL; pp = pp->next) 380 if (pp->plane_no == n) 381 return (pp); 382 for (pp = ground.head; pp != NULL; pp = pp->next) 383 if (pp->plane_no == n) 384 return (pp); 385 return (NULL); 386 } 387 388 int 389 too_close(const PLANE *p1, const PLANE *p2, int dist) 390 { 391 if (ABS(p1->altitude - p2->altitude) <= dist && 392 ABS(p1->xpos - p2->xpos) <= dist && 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 } 414