git.pond.sub.org Git - empserver/blob - src/lib/subs/aircombat.c

   1 /*
   2  *  Empire - A multi-player, client/server Internet based war game.
   3  *  Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
   4  *                           Ken Stevens, Steve McClure
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  *  ---
  21  *
  22  *  See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
  23  *  related information and legal notices. It is expected that any future
  24  *  projects/authors will amend these files as needed.
  25  *
  26  *  ---
  27  *
  28  *  aircombat.c: Deal with air to air combat
  29  *
  30  *  Known contributors to this file:
  31  *     Dave Pare, 1986
  32  *     Thomas Ruschak, 1992
  33  *     Steve McClure, 1996
  34  */
  35
  36 #include <string.h>
  37
  38 #include "misc.h"
  39 #include "player.h"
  40 #include "var.h"
  41 #include "news.h"
  42 #include "land.h"
  43 #include "sect.h"
  44 #include "nuke.h"
  45 #include "plane.h"
  46 #include "ship.h"
  47 #include "nat.h"
  48 #include "file.h"
  49 #include "xy.h"
  50 #include "nsc.h"
  51 #include "path.h"
  52 #include "prototypes.h"
  53 #include "optlist.h"
  54
  55 extern int update_pending;
  56
  57 #ifndef MIN
  58 #define MIN(x,y) ((x) < (y) ? (x) : (y))
  59 #endif
  60 #ifndef MAX
  61 #define MAX(x,y) ((x) < (y) ? (y) : (x))
  62 #endif
  63
  64 static void getilist(struct emp_qelem *list, natid own,
  65                      struct emp_qelem *a, struct emp_qelem *b,
  66                      struct emp_qelem *c, struct emp_qelem *d);
  67 static void ac_dog(register struct plist *ap, register struct plist *dp);
  68
  69 #define DOG_MAX         15
  70 #define FLAK_MAX        15
  71
  72                 /*       -7    -6    -5    -4    -3    -2    -1    0 */
  73 float flaktable[16] = { 0.20, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50,
  74                         0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, };
  75
  76 void
  77 ac_encounter(struct emp_qelem *bomb_list, struct emp_qelem *esc_list, coord x, coord y, s_char *path, int mission_flags, int no_air_defense, struct emp_qelem *obomb, struct emp_qelem *oesc)
  78 {
  79         int     val, non_missiles;
  80         int     rel;
  81         int     dir;
  82         int     nats[MAXNOC];
  83         int     lnats[MAXNOC];
  84         int     gotilist[MAXNOC];
  85         int     unfriendly[MAXNOC];
  86         int     overfly[MAXNOC];
  87         struct  emp_qelem ilist[MAXNOC], *qp;
  88         s_char  mypath[1024];
  89         int     myp;
  90         int     civ, mil;
  91         natid   plane_owner;
  92         struct  sctstr sect;
  93         struct  shpstr ship;
  94         struct  lndstr land;
  95         struct  nstr_item ni;
  96         natid   cn;
  97         struct  natstr *over, *mynatp;
  98         struct  plist *plp;
  99         int     evaded;
 100         struct  shiplook head;
 101         struct  shiplook *s,*s2;
 102         int     changed = 0;
 103         int     intx, inty; /* Last sector planes intercepted over */
 104         int     intown = 0; /* Last owner to intercept */
 105 /* We want to only intercept once per sector per owner.  So, if we overfly
 106    a sector, and then overfly some land units or ships, we don't want to
 107    potentially intercept 3 times. */
 108
 109         bzero((s_char *)&head,sizeof(struct shiplook));
 110         head.uid = -1;
 111
 112         plp = (struct plist *) bomb_list->q_forw;
 113         plane_owner = plp->plane.pln_own;
 114
 115         bzero((s_char *)mypath, 1024);
 116         bcopy(path,mypath,strlen(path));
 117         myp = 0;
 118
 119         bzero((s_char *)overfly, sizeof(overfly));
 120         bzero((s_char *)gotilist, sizeof(gotilist));
 121         bzero((s_char *)unfriendly, sizeof(unfriendly));
 122         for (cn=1; cn<MAXNOC; cn++) {
 123                 if ((mynatp=getnatp(cn)) == 0)
 124                         continue;
 125                 rel = getrel(mynatp, plane_owner);
 126                 if (rel > HOSTILE)
 127                         continue;
 128                 if (plane_owner == cn)
 129                         continue;
 130                 unfriendly[cn]++;
 131         }
 132         if (mission_flags & PM_R) {
 133                 if (mission_flags & P_S) {
 134                         PR(plane_owner,"\nSPY Plane report\n");
 135                         PRdate(plane_owner);
 136                         sathead();
 137                 } else if (mission_flags & P_A){
 138                         PR(plane_owner,"\nAnti-Sub Patrol report\n");
 139                 } else {
 140                         PR(plane_owner,"\nReconnaissance report\n");
 141                         PRdate(plane_owner);
 142                 }
 143         }
 144
 145         pln_removedupes(bomb_list, esc_list);
 146         while ((dir = mypath[myp++]) && !QEMPTY(bomb_list)) {
 147                 if ((val = chkdir(dir, DIR_STOP, DIR_LAST)) == 0)
 148                         break;
 149                 /* XXX using xnorm is probably bad */
 150                 x = xnorm(x + diroff[val][0]);
 151                 y = ynorm(y + diroff[val][1]);
 152                 getsect(x, y, &sect);
 153                 over = getnatp(sect.sct_own);
 154                 if (opt_HIDDEN) {
 155                     setcont(plane_owner,sect.sct_own, FOUND_FLY);
 156                 }
 157
 158                 if (mission_flags & PM_R) {
 159                         if (sect.sct_type == SCT_WATER){
 160                                 PR(plane_owner,"flying over %s at %s\n",
 161                                    dchr[sect.sct_type].d_name,
 162                                    xyas(x, y, plane_owner));
 163                                 if (mission_flags & PM_S)
 164                                         plane_sweep(bomb_list,x,y);
 165                                 if (mission_flags & P_A){
 166                                         plane_sona(bomb_list,x,y,&head);
 167                                 }
 168                                 changed += map_set(plane_owner,
 169                                                   sect.sct_x, sect.sct_y,
 170                                                   dchr[sect.sct_type].d_mnem,
 171                                                   0);
 172                         } else if (mission_flags & P_S) {
 173                                 satdisp(&sect, (mission_flags&P_I)?10:50, 1);
 174                         } else {
 175                                 /* This is borrowed from lookout */
 176                                 if (sect.sct_own == plane_owner)
 177                                         PR(plane_owner,"Your ");
 178                                 else
 179                                         PR(plane_owner,
 180                                                 "%s (#%d) ",
 181                                                 cname(sect.sct_own),
 182                                                 sect.sct_own);
 183                                 PR(plane_owner,dchr[sect.sct_type].d_name);
 184                                 changed += map_set(plane_owner,
 185                                                   sect.sct_x, sect.sct_y,
 186                                                   dchr[sect.sct_type].d_mnem,
 187                                                   0);
 188                                 PR(plane_owner," %d%% efficient ",
 189                                         (sect.sct_own == plane_owner) ?
 190                                         sect.sct_effic :
 191                                         roundintby((int)sect.sct_effic,25));
 192                                 civ = getvar(V_CIVIL, (s_char *)&sect, EF_SECTOR);
 193                                 mil = getvar(V_MILIT, (s_char *)&sect, EF_SECTOR);
 194                                 if (civ)
 195                                         PR(plane_owner,"with %s%d civ ",
 196                                             (sect.sct_own == plane_owner) ?
 197                                                 "" : "approx ",
 198                                             (sect.sct_own == plane_owner) ?
 199                                                 civ : roundintby(civ, 25));
 200                                 if (mil)
 201                                         PR(plane_owner,"with %s%d mil ",
 202                                                 (sect.sct_own == plane_owner) ?
 203                                                 "" : "approx ",
 204                                                 (sect.sct_own == plane_owner) ?
 205                                                 mil : roundintby(mil, 25));
 206                                 PR(plane_owner,"@ %s\n", xyas(x, y, plane_owner));
 207                         }
 208                 } else {
 209                         PR(plane_owner,"flying over %s at %s\n",
 210                                 dchr[sect.sct_type].d_name,
 211                                 xyas(x, y, plane_owner));
 212                         changed += map_set(plane_owner, sect.sct_x,
 213                                            sect.sct_y,
 214                                            dchr[sect.sct_type].d_mnem, 0);
 215                 }
 216                 if ((rel = getrel(over, plane_owner)) == ALLIED)
 217                         continue;
 218
 219                 evaded = do_evade(bomb_list,esc_list);
 220
 221                 if (sect.sct_own != 0 && sect.sct_own != plane_owner &&
 222                     (!evaded)) {
 223                         /* We only show planes overhead if they didn't
 224                          * evade radar */
 225                         overfly[sect.sct_own]++;
 226                         PR(sect.sct_own, "%s planes spotted over %s\n",
 227                             cname(plane_owner), xyas(x, y, sect.sct_own));
 228                 }
 229
 230                 if (!evaded) {
 231                     /* Fire flak */
 232                     if (unfriendly[sect.sct_own])
 233                         ac_doflak(bomb_list, &sect);
 234                     /* If bombers left, fire flak from units and ships */
 235                     if (!QEMPTY(bomb_list))
 236                         ac_landflak(bomb_list, x, y);
 237                     if (!QEMPTY(bomb_list))
 238                         ac_shipflak(bomb_list, x, y);
 239                 }
 240                 /* mission planes aborted due to flak -- don't send escorts */
 241                 if (QEMPTY(bomb_list))
 242                         break;
 243                 if ((!no_air_defense) && (!evaded))
 244                         air_defense(x,y,plane_owner,bomb_list, esc_list);
 245
 246                 if (sect.sct_own == 0 || sect.sct_own == plane_owner)
 247                         continue;
 248
 249                 if (evaded)
 250                         continue;
 251
 252                 non_missiles = 0;
 253                 for (qp = bomb_list->q_forw; qp != bomb_list; qp = qp->q_forw){
 254                         struct plist *ip = (struct plist *) qp;
 255                         if (!(plchr[(int)ip->plane.pln_type].pl_flags & P_M))
 256                                 non_missiles = 1;
 257                 }
 258
 259                 if (!non_missiles)
 260                         continue;
 261
 262                 if (unfriendly[sect.sct_own] && !gotilist[sect.sct_own]) {
 263                         getilist(&ilist[sect.sct_own], sect.sct_own,
 264                                  bomb_list, esc_list, obomb, oesc);
 265                         gotilist[sect.sct_own]++;
 266                 }
 267                 if (rel > HOSTILE)
 268                         continue;
 269                 ac_intercept(bomb_list, esc_list, &ilist[sect.sct_own],
 270                         sect.sct_own, x, y);
 271                 intx = x;
 272                 inty = y;
 273                 intown = sect.sct_own;
 274         }
 275
 276         /* Let's report all of the overflights even if aborted */
 277         for (cn = 1; cn < MAXNOC; cn++) {
 278             if (plane_owner == cn)
 279                 continue;
 280             if (overfly[cn] > 0)
 281                 nreport(plane_owner, N_OVFLY_SECT, cn, overfly[cn]);
 282         }
 283         /* If the map changed, update it */
 284         if (changed)
 285             if (!update_pending && plane_owner == player->cnum)
 286                 writemap(player->cnum);
 287         /* Now, if the bomber and escort lists are empty, we are done */
 288         if (QEMPTY(bomb_list) && QEMPTY(esc_list)) {
 289             if (mission_flags & P_A){
 290                 s=head.next;
 291                 while (s != (struct shiplook *)0){
 292                     s2=s;
 293                     s=s->next;
 294                     free(s2);
 295                 }
 296             }
 297             return;
 298         }
 299
 300         /* Something made it through */
 301         /* Go figure out if there are ships in this sector, and who's they are */
 302         bzero((s_char *)nats, sizeof(nats));
 303         snxtitem_xy(&ni, EF_SHIP, x, y);
 304         while (nxtitem(&ni, (s_char *)&ship)) {
 305             if (mchr[(int)ship.shp_type].m_flags & M_SUB)
 306                 continue;
 307             nats[ship.shp_own]++;
 308         }
 309         /* Go figure out if there are units in this sector, and who's they are */
 310         bzero((s_char *)lnats, sizeof(lnats));
 311         snxtitem_xy(&ni, EF_LAND, x, y);
 312         while (nxtitem(&ni, (s_char *)&land)) {
 313             lnats[land.lnd_own]++;
 314         }
 315
 316         /* Now, let's make life a little rougher. */
 317         for (cn = 1; cn < MAXNOC && !QEMPTY(bomb_list); cn++) {
 318             if (plane_owner == cn)
 319                 continue;
 320             intown = -1;
 321             /* Are there ships owned by this country? */
 322             if (nats[cn] != 0) {
 323                 /* Yes. */
 324                 if (cn != 0)
 325                     PR(cn, "%s planes spotted over ships in %s\n",
 326                        cname(plane_owner), xyas(x, y, cn));
 327                 if (unfriendly[cn]) {
 328                     /* They are unfriendly too */
 329                     if (!gotilist[cn]) {
 330                         getilist(&ilist[cn], cn, bomb_list, esc_list, obomb, oesc);
 331                         gotilist[cn]++;
 332                     }
 333                     PR(plane_owner, "Flying over %s ships in %s\n", cname(cn), xyas(x, y, plane_owner));
 334                                 /* This makes going for ships in harbors tough */
 335                     if (!evaded) {
 336                         /* We already fired flak up above.  Now we intercept again if we haven't already */
 337                         /* Flag that we intercepted */
 338                         intown = 1;
 339                         /* And now intercept again */
 340                         ac_intercept(bomb_list, esc_list, &ilist[cn], cn, x, y);
 341                     }
 342                 }
 343             }
 344             /* Are there units owned by this country? */
 345             if (lnats[cn] != 0) {
 346                 /* Yes. */
 347                 if (cn != 0)
 348                     PR(cn, "%s planes spotted over land units in %s\n",
 349                        cname(plane_owner), xyas(x, y, cn));
 350                 if (unfriendly[cn]) {
 351                     /* They are unfriendly too */
 352                     if (!gotilist[cn]) {
 353                         getilist(&ilist[cn], cn, bomb_list, esc_list, obomb, oesc);
 354                         gotilist[cn]++;
 355                     }
 356                     PR(plane_owner,"Flying over %s land units in %s\n", cname(cn), xyas(x, y, plane_owner));
 357                     if (!evaded) {
 358                         if (intown == -1) {
 359                             /* We haven't intercepted yet, so intercept */
 360                             ac_intercept(bomb_list, esc_list, &ilist[cn], cn, x, y);
 361                         }
 362                     }
 363                 }
 364             }
 365         }
 366
 367         if ((mission_flags & P_A) && (head.uid != -1)) {
 368             s=head.next;
 369             while (s != (struct shiplook *)0){
 370                 s2=s;
 371                 s=s->next;
 372                 free(s2);
 373             }
 374         }
 375 }
 376
 377 static int
 378 count_non_missiles(struct emp_qelem *list)
 379 {
 380         struct  emp_qelem *qp;
 381         struct  plist *plp;
 382         int att_count = 0;
 383
 384         /* don't intercept missiles */
 385         for (qp = list->q_forw; qp != list; qp = qp->q_forw){
 386                 plp = (struct plist *)qp;
 387                 if (!(plp->pcp->pl_flags & P_M))
 388                         att_count++;
 389         }
 390         return att_count;
 391 }
 392
 393 void
 394 sam_intercept(struct emp_qelem *att_list, struct emp_qelem *def_list, natid def_own, natid plane_owner, coord x, coord y, int delete_missiles)
 395 {
 396         struct  emp_qelem *aqp;
 397         struct  emp_qelem *anext;
 398         struct  emp_qelem *dqp;
 399         struct  emp_qelem *dnext;
 400         struct  plist *aplp;
 401         struct  plist *dplp;
 402         int     first = 1;
 403
 404         for (aqp = att_list->q_forw,
 405              dqp = def_list->q_forw;
 406              aqp != att_list &&
 407              dqp != def_list;
 408              aqp = anext) {
 409                 anext = aqp->q_forw;
 410                 aplp = (struct plist *)aqp;
 411                 if (aplp->pcp->pl_flags & P_M)
 412                         continue;
 413                 if (aplp->pcp->pl_cost < 1000)
 414                         continue;
 415                 for (;dqp != def_list; dqp = dnext) {
 416                         dnext = dqp->q_forw;
 417                         dplp = (struct plist *)dqp;
 418                         if (!(dplp->pcp->pl_flags & P_M))
 419                                 continue;
 420
 421                         if (dplp->plane.pln_range < mapdist(x, y, dplp->plane.pln_x, dplp->plane.pln_y)) {
 422                                 emp_remque(dqp);
 423                                 free((s_char *)dqp);
 424                                 continue;
 425                         }
 426                         if (mission_pln_equip(dplp, 0, P_F, 0) < 0) {
 427                                 emp_remque(dqp);
 428                                 free((s_char *)dqp);
 429                                 continue;
 430                         }
 431                         if (first) {
 432                                 first = 0;
 433                                 PR(plane_owner,"%s launches SAMs!\n", cname(def_own));
 434                                 PR(def_own, "Launching SAMs at %s planes!\n", cname(plane_owner));
 435                                 ac_combat_headers(plane_owner, def_own);
 436                         }
 437                         ac_dog(aplp, dplp);
 438                         dqp = dnext;
 439                         break;
 440                 }
 441         }
 442         if (!first) {
 443                 PR(plane_owner, "\n");
 444                 PR(def_own,  "\n");
 445         }
 446         if (delete_missiles) {
 447                 for (;dqp != def_list; dqp = dnext) {
 448                         dnext = dqp->q_forw;
 449                         dplp = (struct plist *)dqp;
 450                         if (!(dplp->pcp->pl_flags & P_M))
 451                                 continue;
 452                         emp_remque(dqp);
 453                         free((s_char *)dqp);
 454                         continue;
 455                 }
 456         }
 457 }
 458
 459 void
 460 ac_intercept(struct emp_qelem *bomb_list, struct emp_qelem *esc_list, struct emp_qelem *def_list, natid def_own, coord x, coord y)
 461 {
 462         register struct plnstr *pp;
 463         struct  plist *plp;
 464         int     icount;
 465         struct  emp_qelem *next;
 466         struct  emp_qelem *qp;
 467         struct  emp_qelem int_list;
 468         int     att_count;
 469         natid   plane_owner;
 470         int     dist;
 471
 472         plp = (struct plist *)bomb_list->q_forw;
 473         plane_owner = plp->plane.pln_own;
 474
 475         icount = 0;
 476
 477         sam_intercept(bomb_list, def_list, def_own, plane_owner, x, y, 0);
 478         sam_intercept(esc_list, def_list, def_own, plane_owner, x, y, 1);
 479         if (!(att_count = count_non_missiles(bomb_list) +
 480               count_non_missiles(esc_list)))
 481                 return;
 482
 483         emp_initque(&int_list);
 484         for (qp = def_list->q_forw; qp != def_list; qp = next) {
 485                 next = qp->q_forw;
 486                 plp = (struct plist *) qp;
 487                 pp = &plp->plane;
 488                 /* SAMs interdict separately */
 489                 if (plp->pcp->pl_flags & P_M)
 490                         continue;
 491                 dist = mapdist(x, y, pp->pln_x, pp->pln_y) * 2;
 492                 if (pp->pln_range < dist)
 493                         continue;
 494                 if (mission_pln_equip(plp, 0, P_F, 0) < 0) {
 495                         emp_remque(qp);
 496                         free((s_char *)qp);
 497                         continue;
 498                 }
 499                 /* got one; delete from def_list, add to int_list */
 500                 emp_remque(qp);
 501                 emp_insque(qp, &int_list);
 502                 pp->pln_mobil -= pln_mobcost(dist,pp,P_F);
 503                 putplane(pp->pln_uid, pp);
 504                 icount++;
 505                 if (icount > att_count)
 506                         break;
 507         }
 508         if (icount == 0)
 509                 return;
 510         PR(plane_owner,"%d %s fighter%s rising to intercept!\n", icount,
 511                 cname(def_own), icount == 1 ? " is" : "s are");
 512         PR(def_own,"%d fighter%s intercepting %s planes!\n", icount,
 513                 icount == 1 ? " is" : "s are", cname(plane_owner));
 514         ac_combat_headers(plane_owner, def_own);
 515         ac_airtoair(esc_list, &int_list, def_own);
 516         ac_airtoair(bomb_list, &int_list, def_own);
 517         PR(plane_owner, "\n");
 518         PR(def_own,  "\n");
 519 }
 520
 521 void
 522 ac_combat_headers(natid plane_owner, natid def_own)
 523 {
 524         PR(plane_owner," %-10.10s %-10.10s  strength int odds  damage           results\n", cname(plane_owner), cname(def_own));
 525         PR(def_own," %-10.10s %-10.10s  strength int odds  damage           results\n", cname(def_own), cname(plane_owner));
 526 }
 527
 528 /*
 529  * air-to-air combat.
 530  */
 531 void
 532 ac_airtoair(struct emp_qelem *att_list, struct emp_qelem *int_list, natid def_own)
 533 {
 534         register struct plist *attacker;
 535         register struct plist *interceptor;
 536         struct  emp_qelem *att;
 537         struct  emp_qelem *in;
 538         int     nplanes;
 539         int     more_att;
 540         int     more_int;
 541         struct  emp_qelem *att_next;
 542         struct  emp_qelem *in_next;
 543         natid   att_own;
 544
 545         att = att_list->q_forw;
 546         in = int_list->q_forw;
 547         more_att = 1;
 548         more_int = 1;
 549         if (QEMPTY(att_list) || QEMPTY(int_list)) {
 550                 more_att = 0;
 551                 more_int = 0;
 552         }
 553         while (more_att || more_int) {
 554                 in_next = in->q_forw;
 555                 att_next = att->q_forw;
 556                 attacker = (struct plist *) att;
 557
 558                 /* skip missiles. If only missiles left, we're done */
 559                 if (plchr[(int)attacker->plane.pln_type].pl_flags & P_M){
 560                         att = att_next;
 561                         if (att == att_list) {
 562                                 more_att = 0;
 563                                 if (QEMPTY(att_list))
 564                                         more_int = 0;
 565                                 else
 566                                         att = att->q_forw;
 567                         }
 568                         if (all_missiles(att_list))
 569                                 more_att = 0;
 570                         continue;
 571                 }
 572                 interceptor = (struct plist *) in;
 573                 att_own = attacker->plane.pln_own;
 574                 def_own = interceptor->plane.pln_own;
 575                 nplanes = attacker->plane.pln_effic;
 576                 if (nplanes > interceptor->plane.pln_effic)
 577                         nplanes = interceptor->plane.pln_effic;
 578                 ac_dog(attacker, interceptor);
 579                 in = in_next;
 580                 att = att_next;
 581                 if (att == att_list) {
 582                         more_att = 0;
 583                         if (QEMPTY(att_list))
 584                                 more_int = 0;
 585                         else
 586                                 att = att->q_forw;
 587                 }
 588                 if (in == int_list) {
 589                         more_int = 0;
 590                         if (QEMPTY(int_list))
 591                                 more_att = 0;
 592                         else
 593                                 in = in->q_forw;
 594                 }
 595         }
 596 }
 597
 598 int
 599 all_missiles(struct emp_qelem *att_list)
 600 {
 601         struct  emp_qelem *qp;
 602         struct  plist *p;
 603
 604         qp = att_list->q_forw;
 605         while (qp != att_list){
 606                 p = (struct plist *)qp;
 607                 if (!(plchr[(int)p->plane.pln_type].pl_flags & P_M))
 608                         return 0;
 609
 610                 qp = qp->q_forw;
 611         }
 612         return 1;
 613 }
 614
 615 static void
 616 ac_dog(register struct plist *ap, register struct plist *dp)
 617 {
 618         int     att, def;
 619         double  odds;
 620         int     intensity;
 621         natid   att_own, def_own;
 622         int     adam, ddam;
 623         s_char  mesg[1024];
 624         s_char  temp[14];
 625
 626         att_own = ap->plane.pln_own;
 627         def_own = dp->plane.pln_own;
 628
 629         PR(att_own," %3.3s #%-4d  %3.3s #%-4d",
 630            ap->pcp->pl_name,
 631            ap->plane.pln_uid,
 632            dp->pcp->pl_name,
 633            dp->plane.pln_uid);
 634         if (def_own)
 635                 PR(def_own," %3.3s #%-4d  %3.3s #%-4d",
 636                    dp->pcp->pl_name,
 637                    dp->plane.pln_uid,
 638                    ap->pcp->pl_name,
 639                    ap->plane.pln_uid);
 640         if (ap->plane.pln_att == 0){
 641                 att = ap->plane.pln_def * ap->plane.pln_effic / 100;
 642                 att = MAX(att,ap->pcp->pl_def/2);
 643         }else{
 644                 att = ap->plane.pln_att * ap->plane.pln_effic / 100;
 645                 att = MAX(att,ap->pcp->pl_att/2);
 646         }
 647
 648         def = dp->plane.pln_def * dp->plane.pln_effic / 100;
 649         def = MAX(def,dp->pcp->pl_def/2);
 650
 651         if ((ap->pcp->pl_flags & P_F) && ap->bombs != 0)
 652                 att -= 2;
 653         if ((dp->pcp->pl_flags & P_F) && dp->bombs != 0)
 654                 def -= 2;
 655         att += ((float)ap->pcp->pl_stealth/25.0);
 656         def += ((float)dp->pcp->pl_stealth/25.0);
 657         if (att < 1) {
 658             def += 1 - att;
 659             att = 1;
 660         }
 661         if (def < 1) {
 662             att += 1 - def;
 663             def = 1;
 664         }
 665         odds = ((double)att/((double)def+(double)att));
 666         if (odds <= 0.05)
 667                 odds = 0.05;
 668         intensity = roll(20)+roll(20)+roll(20)+roll(20)+1;
 669
 670         PR(att_own,"   %3d/%-3d %3d  %3.2f  ",att,def,intensity,odds);
 671         PR(def_own,"   %3d/%-3d %3d  %3.2f  ",def,att,intensity,odds);
 672
 673         adam = 0; ddam = 0;
 674         while ((intensity--)>0){
 675
 676                 if (chance(odds)) {
 677                         ddam += 1;
 678                         if ((dp->plane.pln_effic-ddam) < PLANE_MINEFF)
 679                                 intensity=0;
 680                 } else {
 681                         adam += 1;
 682                         if ((ap->plane.pln_effic-adam) < PLANE_MINEFF)
 683                                 intensity=0;
 684                 }
 685         }
 686
 687         if (dp->pcp->pl_flags & P_M)
 688                 ddam = 100;
 689
 690         PR(att_own,"%3d/%-3d", adam, ddam);
 691         PR(def_own,"%3d/%-3d", ddam, adam);
 692         ac_planedamage(ap, dp->plane.pln_own,
 693                        adam, def_own, 1, 0, mesg);
 694         strncpy(temp,mesg,14);
 695         ac_planedamage(dp, ap->plane.pln_own,
 696                        ddam, att_own, 1, 0, mesg);
 697         PR(att_own, "%-13.13s %-13.13s\n", temp, mesg);
 698         PR(def_own, "%-13.13s %-13.13s\n", mesg, temp);
 699 }
 700
 701 /*
 702  * zap plane associated with plp.
 703  * Damaging country is "from", damage is "dam".
 704  * def_own is the country on the other side of the conflict from the plane
 705  * owner. The only time def_own != from is when the interceptor is getting
 706  * damaged.
 707  *
 708  * NOTE: This routine removes the appropriate plane element from the
 709  * queue if it gets destroyed.  That means that the caller must assume
 710  * that the current queue pointer is invalid on return from the ac_planedamage
 711  * call.  (this has caused bugs in the past)
 712  */
 713 void
 714 ac_planedamage(struct plist *plp, natid from, int dam, natid other, int checkabort, int show, s_char *mesg)
 715 {
 716         register struct plnstr *pp;
 717         int     disp;
 718         s_char  dmess[255];
 719         int     eff;
 720         struct shpstr ship;
 721         struct lndstr land;
 722         /* s_char *sprintf();           already in misc.h [JFW] */
 723         natid   plane_owner;
 724
 725         disp = 0;
 726         pp = &plp->plane;
 727         plane_owner = pp->pln_own;
 728         eff = pp->pln_effic;
 729         sprintf(dmess," no damage");
 730         if (dam <= 0) {
 731             strcpy(mesg, dmess);
 732             return;
 733         }
 734         bzero(dmess,255);
 735         eff -= dam;
 736         if (eff < 0)
 737             eff = 0;
 738         if (eff < PLANE_MINEFF) {
 739             sprintf(dmess," shot down");
 740             disp = 1;
 741         } else if (eff < 80 && chance((100-eff)/100.0) && checkabort){
 742             sprintf(dmess," aborted @%2d%%", eff);
 743             disp = 2;
 744         } else if (show == 0) {
 745             sprintf(dmess," cleared");
 746         }
 747
 748         if ((plp->pcp->pl_flags & P_M) == 0) {
 749             if (show) {
 750                 PR(plane_owner, "    %s %s takes %d%s.\n",
 751                    cname(pp->pln_own),
 752                    prplane(pp), dam, dmess);
 753                 if (other)
 754                     PR(other, "    %s %s takes %d%s.\n",
 755                        cname(pp->pln_own),
 756                        prplane(pp), dam, dmess);
 757             }
 758         }
 759         if (show && checkabort == 1) {
 760             PR(plane_owner,"\n");
 761             if (other)
 762                 PR(other,"\n");
 763         }
 764
 765         pp->pln_effic = eff;
 766         pp->pln_mobil -= min(32 + pp->pln_mobil, dam/2);
 767         if (disp == 1) {
 768             if (from != 0 && (plp->pcp->pl_flags & P_M) == 0)
 769                 nreport(from, N_DOWN_PLANE, pp->pln_own, 1);
 770             if (pp->pln_ship >= 0) {
 771                 getship(pp->pln_ship,&ship);
 772                 take_plane_off_ship(pp,&ship);
 773             }
 774             if (pp->pln_land >= 0) {
 775                 getland(pp->pln_land,&land);
 776                 take_plane_off_land(pp,&land);
 777             }
 778             makelost(EF_PLANE, pp->pln_own, pp->pln_uid, pp->pln_x, pp->pln_y);
 779             pp->pln_own = 0;
 780             putplane(pp->pln_uid, pp);
 781             emp_remque(&plp->queue);
 782             free((s_char *)plp);
 783         } else if (disp == 2) {
 784             putplane(pp->pln_uid, pp);
 785             emp_remque(&plp->queue);
 786             free((s_char *)plp);
 787         } else
 788             putplane(pp->pln_uid, pp);
 789         strcpy(mesg, dmess);
 790 }
 791
 792 void
 793 ac_doflak(struct emp_qelem *list, struct sctstr *from)
 794 {
 795         int     shell, add;
 796         int     gun;
 797         natid   plane_owner;
 798         struct  plist *plp;
 799
 800         plp = (struct plist *)list->q_forw;
 801         plane_owner = plp->plane.pln_own;
 802
 803         gun = getvar(V_GUN, (s_char *)from, EF_SECTOR);
 804         shell = getvar(V_SHELL, (s_char *)from, EF_SECTOR);
 805         add = 0;
 806         if (shell < (gun/2))
 807                 add = supply_commod(from->sct_own,from->sct_x,from->sct_y,
 808                         I_SHELL,ldround(((double)gun/2.0),1)-shell);
 809         shell += add;
 810         if (gun == 0 || shell == 0)
 811                 return;
 812         if (gun > shell*2)
 813                 gun = shell*2;
 814         if (gun > 14)
 815                 gun = 14;
 816
 817         putvar(V_SHELL, shell, (s_char *)from, EF_SECTOR);
 818         putsect(from);
 819         gun = 2.0 * tfact(from->sct_own, (double) gun);
 820         if (gun > 0) {
 821                 PR(plane_owner,"firing %d flak guns in %s...\n",
 822                         gun, xyas(from->sct_x, from->sct_y, plane_owner));
 823                 if(from->sct_own != 0)
 824                 PR(from->sct_own, "firing %d flak guns in %s...\n",
 825                         gun, xyas(from->sct_x, from->sct_y, from->sct_own));
 826                 ac_fireflak(list, from->sct_own, 0, gun);
 827         }
 828 }
 829
 830 void
 831 ac_shipflak(struct emp_qelem *list, coord x, coord y)
 832 {
 833         struct  nstr_item ni;
 834         struct  shpstr ship;
 835         struct  mchrstr *mcp;
 836         int     firing;
 837         int     guns;
 838         int     gun;
 839         int     shell;
 840         int     rel;
 841         struct  plist *plp;
 842         natid   plane_owner;
 843         natid   from;
 844         int     nats[MAXNOC];
 845
 846         plp = (struct plist *)list->q_forw;
 847         plane_owner = plp->plane.pln_own;
 848
 849         bzero((s_char *)nats, sizeof(nats));
 850         guns = 0;
 851         snxtitem_xy(&ni, EF_SHIP, x, y);
 852         while (!QEMPTY(list) && nxtitem(&ni, (s_char *)&ship)) {
 853                 if (ship.shp_own == 0 || ship.shp_own == plane_owner)
 854                         continue;
 855                 if (guns >= 14)
 856                     break;
 857                 mcp = &mchr[(int)ship.shp_type];
 858                 if (mcp->m_flags & M_SUB)
 859                     continue;
 860                 rel = getrel(getnatp(ship.shp_own), plane_owner);
 861                 if (rel > HOSTILE)
 862                     continue;
 863                 shell = gun = 0;
 864                 gun = min(getvar(V_GUN, (s_char *)&ship, EF_SHIP), ship.shp_glim);
 865                 if (gun) {
 866                     shell = getvar(V_SHELL, (s_char *)&ship, EF_SHIP);
 867                     if (shell <= 0)
 868                         shell = supply_commod(ship.shp_own, ship.shp_x,
 869                                               ship.shp_y, I_SHELL, 1);
 870                 }
 871                 if (gun == 0 || shell == 0)
 872                         continue;
 873                 firing = (int) (techfact(ship.shp_tech, (double)gun) * 2.0);
 874                 guns += firing;
 875
 876                 if (!nats[ship.shp_own]) {
 877                     /* First time here, print the message */
 878                     PR(ship.shp_own, "%s planes spotted over ships in %s\n",
 879                        cname(plane_owner), xyas(x, y, ship.shp_own));
 880                     PR(plane_owner, "Flying over %s ships in %s\n", cname(ship.shp_own),
 881                        xyas(x, y, plane_owner));
 882                     nats[ship.shp_own] = 1;
 883                 }
 884                 PR(ship.shp_own, "firing %d flak guns from %s...\n",
 885                         firing, prship(&ship));
 886                 putvar(V_SHELL, shell, (s_char *)&ship, EF_SHIP);
 887                 putship(ship.shp_uid, &ship);
 888                 from = ship.shp_own;
 889         }
 890         if (guns > 0) {
 891             if (guns > 14)
 892                 guns = 14;
 893             guns = 2.0 * tfact(from, (double)guns);
 894             PR(plane_owner, "Flak!  Ships firing %d flak guns...\n", guns);
 895             ac_fireflak(list, from, 0, guns);
 896         }
 897 }
 898
 899 void
 900 ac_landflak(struct emp_qelem *list, coord x, coord y)
 901 {
 902         struct  nstr_item ni;
 903         struct  lndstr land;
 904         struct  lchrstr *lcp;
 905         int     firing;
 906         int     guns;
 907         int     rel;
 908         natid   from;
 909         struct  plist *plp;
 910         natid   plane_owner;
 911         int     nats[MAXNOC];
 912
 913         plp = (struct plist *)list->q_forw;
 914         plane_owner = plp->plane.pln_own;
 915
 916         bzero((s_char *)nats, sizeof(nats));
 917         guns = 0;
 918         snxtitem_xy(&ni, EF_LAND, x, y);
 919         while (!QEMPTY(list) && nxtitem(&ni, (s_char *)&land)) {
 920                 if (land.lnd_own == 0 || land.lnd_own == plane_owner)
 921                         continue;
 922                 if (guns >= 14)
 923                     break;
 924                 lcp = &lchr[(int)land.lnd_type];
 925
 926                 if ((lcp->l_flags & L_FLAK) == 0)
 927                         continue;
 928
 929                 if (land.lnd_aaf == 0)
 930                         continue;
 931
 932                 rel = getrel(getnatp(land.lnd_own), plane_owner);
 933                 if (rel > HOSTILE)
 934                         continue;
 935                 firing = (int)(techfact(land.lnd_tech, (double)land.lnd_aaf) * 3.0);
 936                 guns += firing;
 937
 938                 if (!nats[land.lnd_own]) {
 939                     /* First time here, print the message */
 940                     PR(land.lnd_own, "%s planes spotted over land units in %s\n",
 941                        cname(plane_owner), xyas(x, y, land.lnd_own));
 942                     PR(plane_owner, "Flying over %s land units in %s\n", cname(land.lnd_own),
 943                        xyas(x, y, plane_owner));
 944                     nats[land.lnd_own] = 1;
 945                 }
 946                 PR(land.lnd_own, "firing flak guns from unit %s (aa rating %d)\n",
 947                    prland(&land), land.lnd_aaf);
 948
 949                 from = land.lnd_own; /* We always use the last owner as the from */
 950         }
 951         if (guns > 0) {
 952             if (guns > 14)
 953                 guns = 14;
 954             guns = 2.0 * tfact(from, (double)guns);
 955             PR(plane_owner, "Flak!  Land units firing %d flak guns...\n", guns);
 956             ac_fireflak(list, from, 0, guns);
 957         }
 958 }
 959
 960 /*
 961  * Called from shipflak, landflak, and doflak.
 962  */
 963 void
 964 ac_fireflak(struct emp_qelem *list, natid from, natid other, int guns)
 965 {
 966         extern  double flakscale;
 967         register struct plnstr *pp;
 968         struct  plist *plp;
 969         int     n;
 970         float   mult;
 971         int     diff;
 972         struct  emp_qelem *qp;
 973         struct  emp_qelem *next;
 974         s_char  msg[255];
 975
 976         plp = (struct plist *)list->q_forw;
 977
 978         for (qp = list->q_forw; qp != list; qp = next) {
 979                 /*
 980                  * fighters don't get shot at by flak
 981                  * non-tactical bombers are harder to hit with flak.
 982                  * ('Cause they're not dive-bombing?)
 983                  */
 984                 next = qp->q_forw;
 985                 plp = (struct plist *) qp;
 986                 pp = &plp->plane;
 987                 diff = guns - pp->pln_def;
 988                 if ((plp->pcp->pl_flags & P_T) == 0)
 989                         diff--;
 990                 if (plp->pcp->pl_flags & P_X)
 991                         diff -= 2;
 992                 if (plp->pcp->pl_flags & P_H)
 993                         diff -= 1;
 994                 if (diff > 8)
 995                         mult = flaktable[FLAK_MAX] * 1.33;
 996                 else if (diff < -7)
 997                         mult = flaktable[0] * 0.66;
 998                 else {
 999                         diff += 7;
1000                         mult = flaktable[diff];
1001                 }
1002                 mult *= flakscale;
1003                 n = (int) ((roll(8) + 2) * mult);
1004                 if (n > 100)
1005                         n = 100;
1006                 ac_planedamage(plp, from, n, other, 2, 1, msg);
1007         }
1008 }
1009
1010 /*
1011  * See if this plane is flying in this list
1012  */
1013 int
1014 ac_isflying(struct plnstr *plane, struct emp_qelem *list)
1015 {
1016   struct emp_qelem *qp;
1017   struct emp_qelem *next;
1018   struct plnstr *pp;
1019   struct  plist *plp;
1020
1021   if (!list)
1022     return 0;
1023   for (qp = list->q_forw; qp != list; qp = next) {
1024     next = qp->q_forw;
1025     plp = (struct plist *) qp;
1026     pp = &plp->plane;
1027     if (plane->pln_uid == pp->pln_uid)
1028       return 1;
1029   }
1030   return 0;
1031 }
1032
1033
1034 /*
1035  * Get a list of planes available for interception duties.
1036  */
1037 static void
1038 getilist(struct emp_qelem *list, natid own, struct emp_qelem *a, struct emp_qelem *b, struct emp_qelem *c, struct emp_qelem *d)
1039 {
1040         register struct plchrstr *pcp;
1041         struct  plnstr plane;
1042         struct  shpstr ship;
1043         struct  lndstr land;
1044         struct  sctstr sect;
1045         struct  nstr_item ni;
1046         int     type;
1047         s_char  *ptr;
1048         struct  plist *ip;
1049
1050         emp_initque(list);
1051         snxtitem_all(&ni, EF_PLANE);
1052         while (nxtitem(&ni, (s_char *)&plane)) {
1053                 if (plane.pln_own != own)
1054                         continue;
1055                 pcp = &plchr[(int)plane.pln_type];
1056                 if ((pcp->pl_flags & P_F) == 0)
1057                         continue;
1058                 if (plane.pln_mission != 0)
1059                         continue;
1060                 if (plane.pln_mobil <= 0)
1061                         continue;
1062                 if (plane.pln_effic < 40)
1063                         continue;
1064                 if (plane.pln_ship >= 0) {
1065                         if (!can_fly(plane.pln_uid))
1066                                 continue;
1067                         getship(plane.pln_ship,&ship);
1068                         ptr = (s_char *)&ship;
1069                         type = EF_SHIP;
1070                 } else
1071                 if (plane.pln_land >= 0) {
1072                         if (!can_fly(plane.pln_uid))
1073                                 continue;
1074                         getland(plane.pln_land,&land);
1075                         ptr = (s_char *)&land;
1076                         type = EF_LAND;
1077                 } else {
1078                         getsect(plane.pln_x, plane.pln_y, &sect);
1079                         ptr = (s_char *)&sect;
1080                         type = EF_SECTOR;
1081 #if 0
1082                         if (sect.sct_effic < 60 && (pcp->pl_flags & P_V) == 0)
1083                                 continue;
1084 #else
1085                         if ((sect.sct_effic < 60 || sect.sct_type != SCT_AIRPT)
1086                         && (pcp->pl_flags & P_V) == 0)
1087                                 continue;
1088 #endif
1089                 }
1090                 if (((float)getvar(V_PETROL, ptr, type)) <
1091                         (((float)pcp->pl_fuel)/2.0))
1092                         continue;
1093                 /* Finally, is it in the list of planes already in
1094                    flight? */
1095                 if (ac_isflying(&plane, a))
1096                   continue;
1097                 if (ac_isflying(&plane, b))
1098                   continue;
1099                 if (ac_isflying(&plane, c))
1100                   continue;
1101                 if (ac_isflying(&plane, d))
1102                   continue;
1103                 /* got one! */
1104                 ip = (struct plist *) malloc(sizeof(*ip));
1105                 ip->state = P_OK;
1106                 ip->bombs = 0;
1107                 ip->misc = 0;
1108                 ip->pcp = &plchr[(int)plane.pln_type];
1109                 bcopy((s_char *)&plane, (s_char *)&ip->plane, sizeof(plane));
1110                 emp_insque(&ip->queue, list);
1111         }
1112 }
1113
1114
1115
1116 int
1117 can_fly(int p) /* Can this plane fly from the ship or land unit it is on? */
1118
1119 {
1120         struct plnstr plane;
1121         struct shpstr ship;
1122         struct lndstr land;
1123         struct plchrstr *pcp;
1124         struct mchrstr *scp;
1125         struct lchrstr *lcp;
1126
1127         getplane(p,&plane);
1128         pcp = &plchr[(int)plane.pln_type];
1129
1130         if (plane.pln_ship >= 0){
1131                 if (
1132                         !(pcp->pl_flags & P_L) && !(pcp->pl_flags & P_M)
1133                         && !(pcp->pl_flags & P_K)
1134                         && !(pcp->pl_flags & P_E)
1135                         )
1136                         return 0;
1137
1138                 getship(plane.pln_ship,&ship);
1139                 scp = & mchr[(int)ship.shp_type];
1140
1141                 if ((pcp->pl_flags & P_L) && (scp->m_flags & M_FLY)){
1142                         return 1;
1143                 }
1144
1145                 if ((pcp->pl_flags & P_M) && (scp->m_flags & M_MSL)){
1146                         return 1;
1147                 }
1148
1149                 if ((pcp->pl_flags & P_K) && (scp->m_flags & M_CHOPPER)){
1150                         return 1;
1151                 }
1152
1153                 if ((pcp->pl_flags & P_E) && (scp->m_flags & M_XLIGHT)){
1154                         return 1;
1155                 }
1156         }
1157
1158         if (plane.pln_land >= 0){
1159                 if (!(pcp->pl_flags & P_E))
1160                         return 0;
1161
1162                 getland(plane.pln_land,&land);
1163                 lcp = & lchr[(int)land.lnd_type];
1164
1165                 if ((pcp->pl_flags & P_E) && (lcp->l_flags & L_XLIGHT)){
1166                         return 1;
1167                 }
1168         }
1169
1170         return 0;
1171 }
1172
1173 int
1174 do_evade(struct emp_qelem *bomb_list, struct emp_qelem *esc_list)
1175 {
1176         struct emp_qelem *qp;
1177         double evade;
1178         struct plist *plp;
1179
1180         evade=100.0;
1181         for (qp = bomb_list->q_forw; qp != bomb_list; qp = qp->q_forw){
1182                 plp = (struct plist *) qp;
1183                 if (evade > ((float)plp->pcp->pl_stealth/100.0))
1184                         evade = (plp->pcp->pl_stealth/100.0);
1185         }
1186         for (qp = esc_list->q_forw; qp != esc_list; qp = qp->q_forw){
1187                 plp = (struct plist *) qp;
1188                 if (evade > plp->pcp->pl_stealth/100.0)
1189                         evade = (plp->pcp->pl_stealth/100.0);
1190         }
1191
1192         if (chance(evade))
1193                 return 1;
1194
1195         return 0;
1196 }