2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2006, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure
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.
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.
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
22 * See files README, COPYING and CREDITS in the root of the source
23 * tree for related information and legal notices. It is expected
24 * that future projects/authors will amend these files as needed.
28 * aircombat.c: Deal with air to air combat
30 * Known contributors to this file:
32 * Thomas Ruschak, 1992
52 #include "prototypes.h"
56 #define FLAK_GUN_MAX 14
58 static void ac_intercept(struct emp_qelem *, struct emp_qelem *,
59 struct emp_qelem *, natid, coord, coord);
60 static int all_missiles(struct emp_qelem *);
61 static void ac_dog(struct plist *, struct plist *);
62 static void ac_planedamage(struct plist *, natid, int, natid, int,
64 static void ac_doflak(struct emp_qelem *, struct sctstr *);
65 static void ac_landflak(struct emp_qelem *, coord, coord);
66 static void ac_shipflak(struct emp_qelem *, coord, coord);
67 static void ac_fireflak(struct emp_qelem *, natid, int);
68 static void getilist(struct emp_qelem *, natid,
69 struct emp_qelem *, struct emp_qelem *,
70 struct emp_qelem *, struct emp_qelem *);
71 static int can_fly(int);
72 static int do_evade(struct emp_qelem *, struct emp_qelem *);
75 ac_encounter(struct emp_qelem *bomb_list, struct emp_qelem *esc_list,
76 coord x, coord y, char *path, int mission_flags,
77 int no_air_defense, struct emp_qelem *obomb,
78 struct emp_qelem *oesc)
80 int val, non_missiles;
86 int unfriendly[MAXNOC];
88 struct emp_qelem ilist[MAXNOC], *qp;
98 struct natstr *over, *mynatp;
101 struct shiplist *head = NULL;
103 int intown = 0; /* Last owner to intercept */
104 /* We want to only intercept once per sector per owner. So, if we overfly
105 a sector, and then overfly some land units or ships, we don't want to
106 potentially intercept 3 times. */
108 plp = (struct plist *)bomb_list->q_forw;
109 plane_owner = plp->plane.pln_own;
111 strncpy(mypath, path, sizeof(mypath));
114 memset(overfly, 0, sizeof(overfly));
115 memset(gotilist, 0, sizeof(gotilist));
116 memset(unfriendly, 0, sizeof(unfriendly));
117 for (cn = 1; cn < MAXNOC; cn++) {
118 if ((mynatp = getnatp(cn)) == 0)
120 rel = getrel(mynatp, plane_owner);
123 if (plane_owner == cn)
127 if (mission_flags & PM_R) {
128 if (mission_flags & P_S) {
129 PR(plane_owner, "\nSPY Plane report\n");
132 } else if (mission_flags & P_A) {
133 PR(plane_owner, "\nAnti-Sub Patrol report\n");
135 PR(plane_owner, "\nReconnaissance report\n");
140 pln_removedupes(bomb_list, esc_list);
141 while ((dir = mypath[myp++]) && !QEMPTY(bomb_list)) {
142 if ((val = diridx(dir)) == DIR_STOP)
144 /* XXX using xnorm is probably bad */
145 x = xnorm(x + diroff[val][0]);
146 y = ynorm(y + diroff[val][1]);
147 getsect(x, y, §);
148 over = getnatp(sect.sct_own);
150 if (mission_flags & PM_R) {
152 setcont(plane_owner, sect.sct_own, FOUND_FLY);
153 if (sect.sct_type == SCT_WATER) {
154 PR(plane_owner, "flying over %s at %s\n",
155 dchr[sect.sct_type].d_name, xyas(x, y, plane_owner));
156 if (mission_flags & PM_S)
157 plane_sweep(bomb_list, x, y);
158 if (mission_flags & P_A) {
159 plane_sona(bomb_list, x, y, &head);
161 changed += map_set(plane_owner,
162 sect.sct_x, sect.sct_y,
163 dchr[sect.sct_type].d_mnem, 0);
164 } else if (mission_flags & P_S) {
165 satdisp(§, (mission_flags & P_I) ? 10 : 50, 1);
167 /* This is borrowed from lookout */
168 if (sect.sct_own == plane_owner)
169 PR(plane_owner, "Your ");
171 PR(plane_owner, "%s (#%d) ",
172 cname(sect.sct_own), sect.sct_own);
173 PR(plane_owner, "%s", dchr[sect.sct_type].d_name);
174 changed += map_set(plane_owner,
175 sect.sct_x, sect.sct_y,
176 dchr[sect.sct_type].d_mnem, 0);
177 PR(plane_owner, " %d%% efficient ",
178 (sect.sct_own == plane_owner) ?
179 sect.sct_effic : roundintby((int)sect.sct_effic, 25));
180 civ = sect.sct_item[I_CIVIL];
181 mil = sect.sct_item[I_MILIT];
183 PR(plane_owner, "with %s%d civ ",
184 (sect.sct_own == plane_owner) ?
186 (sect.sct_own == plane_owner) ?
187 civ : roundintby(civ, 25));
189 PR(plane_owner, "with %s%d mil ",
190 (sect.sct_own == plane_owner) ?
192 (sect.sct_own == plane_owner) ?
193 mil : roundintby(mil, 25));
194 PR(plane_owner, "@ %s\n", xyas(x, y, plane_owner));
197 PR(plane_owner, "flying over %s at %s\n",
198 dchr[sect.sct_type].d_name, xyas(x, y, plane_owner));
199 changed += map_set(plane_owner, sect.sct_x, sect.sct_y,
200 dchr[sect.sct_type].d_mnem, 0);
202 if ((rel = getrel(over, plane_owner)) == ALLIED)
205 evaded = do_evade(bomb_list, esc_list);
207 if (sect.sct_own != 0 && sect.sct_own != plane_owner && !evaded) {
208 /* We only show planes overhead if they didn't
210 overfly[sect.sct_own]++;
211 PR(sect.sct_own, "%s planes spotted over %s\n",
212 cname(plane_owner), xyas(x, y, sect.sct_own));
214 setcont(cn, plane_owner, FOUND_FLY);
219 if (unfriendly[sect.sct_own])
220 ac_doflak(bomb_list, §);
221 /* If bombers left, fire flak from units and ships */
222 if (!QEMPTY(bomb_list))
223 ac_landflak(bomb_list, x, y);
224 if (!QEMPTY(bomb_list))
225 ac_shipflak(bomb_list, x, y);
227 /* mission planes aborted due to flak -- don't send escorts */
228 if (QEMPTY(bomb_list))
230 if (!no_air_defense && !evaded)
231 air_defense(x, y, plane_owner, bomb_list, esc_list);
233 if (sect.sct_own == 0 || sect.sct_own == plane_owner)
240 for (qp = bomb_list->q_forw; qp != bomb_list; qp = qp->q_forw) {
241 struct plist *ip = (struct plist *)qp;
242 if (!(plchr[(int)ip->plane.pln_type].pl_flags & P_M))
249 if (unfriendly[sect.sct_own] && !gotilist[sect.sct_own]) {
250 getilist(&ilist[sect.sct_own], sect.sct_own,
251 bomb_list, esc_list, obomb, oesc);
252 gotilist[sect.sct_own]++;
256 ac_intercept(bomb_list, esc_list, &ilist[sect.sct_own],
258 intown = sect.sct_own;
261 /* Let's report all of the overflights even if aborted */
262 for (cn = 1; cn < MAXNOC; cn++) {
263 if (plane_owner == cn)
266 nreport(plane_owner, N_OVFLY_SECT, cn, overfly[cn]);
268 /* If the map changed, update it */
270 if (!update_pending && plane_owner == player->cnum)
271 writemap(player->cnum);
272 /* Now, if the bomber and escort lists are empty, we are done */
273 if (QEMPTY(bomb_list) && QEMPTY(esc_list)) {
274 if (mission_flags & P_A)
275 free_shiplist(&head);
279 /* Something made it through */
280 /* Go figure out if there are ships in this sector, and who's they are */
281 memset(nats, 0, sizeof(nats));
282 snxtitem_xy(&ni, EF_SHIP, x, y);
283 while (nxtitem(&ni, &ship)) {
284 if (mchr[(int)ship.shp_type].m_flags & M_SUB)
286 nats[ship.shp_own]++;
288 /* Go figure out if there are units in this sector, and who's they are */
289 memset(lnats, 0, sizeof(lnats));
290 snxtitem_xy(&ni, EF_LAND, x, y);
291 while (nxtitem(&ni, &land)) {
292 if (land.lnd_ship >= 0 || land.lnd_land >= 0)
294 lnats[land.lnd_own]++;
297 /* Now, let's make life a little rougher. */
298 for (cn = 1; cn < MAXNOC && !QEMPTY(bomb_list); cn++) {
299 if (plane_owner == cn)
302 /* Are there ships owned by this country? */
306 PR(cn, "%s planes spotted over ships in %s\n",
307 cname(plane_owner), xyas(x, y, cn));
309 setcont(cn, plane_owner, FOUND_FLY);
311 if (unfriendly[cn]) {
312 /* They are unfriendly too */
314 getilist(&ilist[cn], cn, bomb_list, esc_list, obomb,
318 PR(plane_owner, "Flying over %s ships in %s\n",
319 cname(cn), xyas(x, y, plane_owner));
320 /* This makes going for ships in harbors tough */
322 /* We already fired flak up above. Now we intercept again if we haven't already */
323 /* Flag that we intercepted */
325 /* And now intercept again */
326 ac_intercept(bomb_list, esc_list, &ilist[cn],
331 /* Are there units owned by this country? */
332 if (lnats[cn] != 0) {
335 PR(cn, "%s planes spotted over land units in %s\n",
336 cname(plane_owner), xyas(x, y, cn));
338 setcont(cn, plane_owner, FOUND_FLY);
340 if (unfriendly[cn]) {
341 /* They are unfriendly too */
343 getilist(&ilist[cn], cn, bomb_list, esc_list, obomb,
347 PR(plane_owner, "Flying over %s land units in %s\n",
348 cname(cn), xyas(x, y, plane_owner));
351 /* We haven't intercepted yet, so intercept */
352 ac_intercept(bomb_list, esc_list, &ilist[cn],
359 if (mission_flags & P_A)
360 free_shiplist(&head);
364 count_non_missiles(struct emp_qelem *list)
366 struct emp_qelem *qp;
370 /* don't intercept missiles */
371 for (qp = list->q_forw; qp != list; qp = qp->q_forw) {
372 plp = (struct plist *)qp;
373 if (!(plp->pcp->pl_flags & P_M))
380 sam_intercept(struct emp_qelem *att_list, struct emp_qelem *def_list,
381 natid def_own, natid plane_owner, coord x, coord y,
384 struct emp_qelem *aqp;
385 struct emp_qelem *anext;
386 struct emp_qelem *dqp;
387 struct emp_qelem *dnext;
392 for (aqp = att_list->q_forw,
393 dqp = def_list->q_forw;
394 aqp != att_list && dqp != def_list; aqp = anext) {
396 aplp = (struct plist *)aqp;
397 if (aplp->pcp->pl_flags & P_M)
399 if (aplp->pcp->pl_cost < 1000)
401 for (; dqp != def_list; dqp = dnext) {
403 dplp = (struct plist *)dqp;
404 if (!(dplp->pcp->pl_flags & P_M))
407 if (dplp->plane.pln_range <
408 mapdist(x, y, dplp->plane.pln_x, dplp->plane.pln_y)) {
413 if (mission_pln_equip(dplp, 0, P_F, 0) < 0) {
420 PR(plane_owner, "%s launches SAMs!\n", cname(def_own));
421 PR(def_own, "Launching SAMs at %s planes!\n",
423 ac_combat_headers(plane_owner, def_own);
431 PR(plane_owner, "\n");
434 if (delete_missiles) {
435 for (; dqp != def_list; dqp = dnext) {
437 dplp = (struct plist *)dqp;
438 if (!(dplp->pcp->pl_flags & P_M))
448 ac_intercept(struct emp_qelem *bomb_list, struct emp_qelem *esc_list,
449 struct emp_qelem *def_list, natid def_own, coord x, coord y)
454 struct emp_qelem *next;
455 struct emp_qelem *qp;
456 struct emp_qelem int_list;
461 plp = (struct plist *)bomb_list->q_forw;
462 plane_owner = plp->plane.pln_own;
466 sam_intercept(bomb_list, def_list, def_own, plane_owner, x, y, 0);
467 sam_intercept(esc_list, def_list, def_own, plane_owner, x, y, 1);
468 if (!(att_count = count_non_missiles(bomb_list) +
469 count_non_missiles(esc_list)))
472 emp_initque(&int_list);
473 for (qp = def_list->q_forw; qp != def_list; qp = next) {
475 plp = (struct plist *)qp;
477 /* SAMs interdict separately */
478 if (plp->pcp->pl_flags & P_M)
480 dist = mapdist(x, y, pp->pln_x, pp->pln_y) * 2;
481 if (pp->pln_range < dist)
483 if (mission_pln_equip(plp, 0, P_F, 0) < 0) {
488 /* got one; delete from def_list, add to int_list */
490 emp_insque(qp, &int_list);
491 pp->pln_mobil -= pln_mobcost(dist, pp, P_F);
492 putplane(pp->pln_uid, pp);
494 if (icount > att_count)
499 PR(plane_owner, "%d %s fighter%s rising to intercept!\n",
500 icount, cname(def_own), icount == 1 ? " is" : "s are");
501 PR(def_own, "%d fighter%s intercepting %s planes!\n",
502 icount, icount == 1 ? " is" : "s are", cname(plane_owner));
503 ac_combat_headers(plane_owner, def_own);
504 ac_airtoair(esc_list, &int_list);
505 ac_airtoair(bomb_list, &int_list);
506 PR(plane_owner, "\n");
511 ac_combat_headers(natid plane_owner, natid def_own)
514 " %-10.10s %-10.10s strength int odds damage results\n",
515 cname(plane_owner), cname(def_own));
517 " %-10.10s %-10.10s strength int odds damage results\n",
518 cname(def_own), cname(plane_owner));
525 ac_airtoair(struct emp_qelem *att_list, struct emp_qelem *int_list)
527 struct plist *attacker;
528 struct plist *interceptor;
529 struct emp_qelem *att;
530 struct emp_qelem *in;
534 struct emp_qelem *att_next;
535 struct emp_qelem *in_next;
537 att = att_list->q_forw;
538 in = int_list->q_forw;
541 if (QEMPTY(att_list) || QEMPTY(int_list)) {
545 while (more_att || more_int) {
546 in_next = in->q_forw;
547 att_next = att->q_forw;
548 attacker = (struct plist *)att;
550 /* skip missiles. If only missiles left, we're done */
551 if (plchr[(int)attacker->plane.pln_type].pl_flags & P_M) {
553 if (att == att_list) {
555 if (QEMPTY(att_list))
560 if (all_missiles(att_list))
564 interceptor = (struct plist *)in;
565 nplanes = attacker->plane.pln_effic;
566 if (nplanes > interceptor->plane.pln_effic)
567 nplanes = interceptor->plane.pln_effic;
568 ac_dog(attacker, interceptor);
571 if (att == att_list) {
573 if (QEMPTY(att_list))
578 if (in == int_list) {
580 if (QEMPTY(int_list))
589 all_missiles(struct emp_qelem *att_list)
591 struct emp_qelem *qp;
594 qp = att_list->q_forw;
595 while (qp != att_list) {
596 p = (struct plist *)qp;
597 if (!(plchr[(int)p->plane.pln_type].pl_flags & P_M))
606 ac_dog(struct plist *ap, struct plist *dp)
611 natid att_own, def_own;
616 att_own = ap->plane.pln_own;
617 def_own = dp->plane.pln_own;
619 PR(att_own, " %3.3s #%-4d %3.3s #%-4d",
621 ap->plane.pln_uid, dp->pcp->pl_name, dp->plane.pln_uid);
623 PR(def_own, " %3.3s #%-4d %3.3s #%-4d",
625 dp->plane.pln_uid, ap->pcp->pl_name, ap->plane.pln_uid);
626 if (ap->plane.pln_att == 0) {
627 att = ap->plane.pln_def * ap->plane.pln_effic / 100;
628 att = MAX(att, ap->pcp->pl_def / 2);
630 att = ap->plane.pln_att * ap->plane.pln_effic / 100;
631 att = MAX(att, ap->pcp->pl_att / 2);
634 def = dp->plane.pln_def * dp->plane.pln_effic / 100;
635 def = MAX(def, dp->pcp->pl_def / 2);
637 if ((ap->pcp->pl_flags & P_F) && ap->bombs != 0)
639 if ((dp->pcp->pl_flags & P_F) && dp->bombs != 0)
641 att += ap->pcp->pl_stealth / 25.0;
642 def += dp->pcp->pl_stealth / 25.0;
651 odds = ((double)att / ((double)def + (double)att));
654 intensity = roll(20) + roll(20) + roll(20) + roll(20) + 1;
656 PR(att_own, " %3d/%-3d %3d %3.2f ", att, def, intensity, odds);
657 PR(def_own, " %3d/%-3d %3d %3.2f ", def, att, intensity, odds);
661 while ((intensity--) > 0) {
665 if ((dp->plane.pln_effic - ddam) < PLANE_MINEFF)
669 if ((ap->plane.pln_effic - adam) < PLANE_MINEFF)
674 if (dp->pcp->pl_flags & P_M)
677 PR(att_own, "%3d/%-3d", adam, ddam);
678 PR(def_own, "%3d/%-3d", ddam, adam);
679 ac_planedamage(ap, def_own, adam, def_own, 1, 0, mesg);
680 strncpy(temp, mesg, 14);
681 ac_planedamage(dp, att_own, ddam, att_own, 1, 0, mesg);
682 PR(att_own, "%-13.13s %-13.13s\n", temp, mesg);
683 PR(def_own, "%-13.13s %-13.13s\n", mesg, temp);
686 setcont(att_own, def_own, FOUND_FLY);
687 setcont(def_own, att_own, FOUND_FLY);
692 * zap plane associated with plp.
693 * Damaging country is "from", damage is "dam".
694 * def_own is the country on the other side of the conflict from the plane
695 * owner. The only time def_own != from is when the interceptor is getting
698 * NOTE: This routine removes the appropriate plane element from the
699 * queue if it gets destroyed. That means that the caller must assume
700 * that the current queue pointer is invalid on return from the ac_planedamage
701 * call. (this has caused bugs in the past)
704 ac_planedamage(struct plist *plp, natid from, int dam, natid other,
705 int checkabort, int show, char *mesg)
717 plane_owner = pp->pln_own;
719 sprintf(dmess, " no damage");
724 memset(dmess, 0, sizeof(dmess));
728 if (eff < PLANE_MINEFF) {
729 sprintf(dmess, " shot down");
731 } else if (eff < 80 && chance((100 - eff) / 100.0) && checkabort) {
732 sprintf(dmess, " aborted @%2d%%", eff);
734 } else if (show == 0) {
735 sprintf(dmess, " cleared");
738 if ((plp->pcp->pl_flags & P_M) == 0) {
740 PR(plane_owner, " %s %s takes %d%s.\n",
741 cname(pp->pln_own), prplane(pp), dam, dmess);
743 PR(other, " %s %s takes %d%s.\n",
744 cname(pp->pln_own), prplane(pp), dam, dmess);
747 if (show && checkabort == 1) {
748 PR(plane_owner, "\n");
754 pp->pln_mobil -= MIN(32 + pp->pln_mobil, dam / 2);
756 if (from != 0 && (plp->pcp->pl_flags & P_M) == 0)
757 nreport(from, N_DOWN_PLANE, pp->pln_own, 1);
758 if (pp->pln_ship >= 0) {
759 getship(pp->pln_ship, &ship);
760 take_plane_off_ship(pp, &ship);
762 if (pp->pln_land >= 0) {
763 getland(pp->pln_land, &land);
764 take_plane_off_land(pp, &land);
767 putplane(pp->pln_uid, pp);
768 emp_remque(&plp->queue);
770 } else if (disp == 2) {
771 putplane(pp->pln_uid, pp);
772 emp_remque(&plp->queue);
775 putplane(pp->pln_uid, pp);
780 ac_doflak(struct emp_qelem *list, struct sctstr *from)
787 plp = (struct plist *)list->q_forw;
788 plane_owner = plp->plane.pln_own;
790 gun = MIN(FLAK_GUN_MAX, from->sct_item[I_GUN]);
791 shell = from->sct_item[I_SHELL];
792 if (gun > shell * 2) {
793 shell += supply_commod(from->sct_own, from->sct_x, from->sct_y,
794 I_SHELL, (gun + 1) / 2 - shell);
795 from->sct_item[I_SHELL] = shell;
801 gun = roundavg(tfact(from->sct_own, 2.0 * gun));
803 PR(plane_owner, "firing %d flak guns in %s...\n",
804 gun, xyas(from->sct_x, from->sct_y, plane_owner));
805 if (from->sct_own != 0)
806 PR(from->sct_own, "firing %d flak guns in %s...\n",
807 gun, xyas(from->sct_x, from->sct_y, from->sct_own));
808 ac_fireflak(list, from->sct_own, gun);
813 ac_shipflak(struct emp_qelem *list, coord x, coord y)
818 double flak, total, ngun;
826 plp = (struct plist *)list->q_forw;
827 plane_owner = plp->plane.pln_own;
829 memset(nats, 0, sizeof(nats));
831 snxtitem_xy(&ni, EF_SHIP, x, y);
832 while (!QEMPTY(list) && nxtitem(&ni, &ship)) {
833 if (ship.shp_own == 0 || ship.shp_own == plane_owner)
835 mcp = &mchr[(int)ship.shp_type];
836 if (mcp->m_flags & M_SUB)
838 rel = getrel(getnatp(ship.shp_own), plane_owner);
842 gun = MIN(ship.shp_item[I_GUN], ship.shp_glim);
844 shell = ship.shp_item[I_SHELL];
846 shell = supply_commod(ship.shp_own, ship.shp_x, ship.shp_y,
848 ship.shp_item[I_SHELL] = shell;
849 putship(ship.shp_uid, &ship);
852 if (gun == 0 || shell == 0)
854 flak = gun * (ship.shp_effic / 100.0);
856 total += techfact(ship.shp_tech, flak * 2.0);
858 if (!nats[ship.shp_own]) {
859 /* First time here, print the message */
860 PR(ship.shp_own, "%s planes spotted over ships in %s\n",
861 cname(plane_owner), xyas(x, y, ship.shp_own));
862 PR(plane_owner, "Flying over %s ships in %s\n",
863 cname(ship.shp_own), xyas(x, y, plane_owner));
864 nats[ship.shp_own] = 1;
866 PR(ship.shp_own, "firing %.0f flak guns from %s...\n",
867 flak, prship(&ship));
871 /* Limit to FLAK_GUN_MAX guns of average tech factor */
872 if (ngun > FLAK_GUN_MAX)
873 total *= FLAK_GUN_MAX / ngun;
875 gun = roundavg(total);
877 PR(plane_owner, "Flak! Ships firing %d flak guns...\n", gun);
878 ac_fireflak(list, from, gun);
883 ac_landflak(struct emp_qelem *list, coord x, coord y)
888 double flak, total, ngun;
896 plp = (struct plist *)list->q_forw;
897 plane_owner = plp->plane.pln_own;
899 memset(nats, 0, sizeof(nats));
901 snxtitem_xy(&ni, EF_LAND, x, y);
902 while (!QEMPTY(list) && nxtitem(&ni, &land)) {
903 if (land.lnd_own == 0 || land.lnd_own == plane_owner)
905 lcp = &lchr[(int)land.lnd_type];
906 if ((lcp->l_flags & L_FLAK) == 0 || land.lnd_aaf == 0)
908 if (land.lnd_ship >= 0 || land.lnd_land >= 0)
910 rel = getrel(getnatp(land.lnd_own), plane_owner);
913 flak = land.lnd_aaf * 1.5 * land.lnd_effic / 100.0;
915 total += techfact(land.lnd_tech, flak * 2.0);
917 if (!nats[land.lnd_own]) {
918 /* First time here, print the message */
919 PR(land.lnd_own, "%s planes spotted over land units in %s\n",
920 cname(plane_owner), xyas(x, y, land.lnd_own));
921 PR(plane_owner, "Flying over %s land units in %s\n",
922 cname(land.lnd_own), xyas(x, y, plane_owner));
923 nats[land.lnd_own] = 1;
925 PR(land.lnd_own, "firing flak guns from unit %s (aa rating %d)\n",
926 prland(&land), land.lnd_aaf);
930 /* Limit to FLAK_GUN_MAX guns of average tech factor */
931 if (ngun > FLAK_GUN_MAX)
932 total *= FLAK_GUN_MAX / ngun;
934 gun = roundavg(total);
936 PR(plane_owner, "Flak! Land units firing %d flak guns...\n", gun);
937 ac_fireflak(list, from, gun);
942 * Called from shipflak, landflak, and doflak.
945 ac_fireflak(struct emp_qelem *list, natid from, int guns)
951 struct emp_qelem *qp;
952 struct emp_qelem *next;
955 plp = (struct plist *)list->q_forw;
957 for (qp = list->q_forw; qp != list; qp = next) {
959 * fighters don't get shot at by flak
960 * non-tactical bombers are harder to hit with flak.
961 * ('Cause they're not dive-bombing?)
964 plp = (struct plist *)qp;
966 diff = guns - pp->pln_def;
967 if ((plp->pcp->pl_flags & P_T) == 0)
969 if (plp->pcp->pl_flags & P_X)
971 if (plp->pcp->pl_flags & P_H)
973 n = ac_flak_dam(diff);
974 ac_planedamage(plp, from, n, 0, 2, 1, msg);
979 * Calculate flak damage
982 ac_flak_dam(int flak)
986 /* <-7 -7 -6 -5 -4 */
987 static float flaktable[18] = { 0.132f, 0.20f, 0.20f, 0.25f, 0.30f,
988 /* -3 -2 -1 0 +1 +2 +3 +4 */
989 0.35f, 0.40f, 0.45f, 0.50f, 0.50f, 0.55f, 0.60f, 0.65f,
990 /* +5 +6 +7 +8 >+8 */
991 0.70f,0.75f, 0.80f, 0.85f, 1.1305f };
992 enum { FLAK_MAX = sizeof(flaktable)/sizeof(flaktable[0]) - 1 };
995 mult = flaktable[FLAK_MAX];
1000 mult = flaktable[flak];
1003 dam = (int)((roll(8) + 2) * mult);
1010 * See if this plane is flying in this list
1013 ac_isflying(struct plnstr *plane, struct emp_qelem *list)
1015 struct emp_qelem *qp;
1016 struct emp_qelem *next;
1022 for (qp = list->q_forw; qp != list; qp = next) {
1024 plp = (struct plist *)qp;
1026 if (plane->pln_uid == pp->pln_uid)
1034 * Get a list of planes available for interception duties.
1037 getilist(struct emp_qelem *list, natid own, struct emp_qelem *a,
1038 struct emp_qelem *b, struct emp_qelem *c, struct emp_qelem *d)
1040 struct plchrstr *pcp;
1041 struct plnstr plane;
1045 struct nstr_item ni;
1050 snxtitem_all(&ni, EF_PLANE);
1051 while (nxtitem(&ni, &plane)) {
1052 if (plane.pln_own != own)
1054 pcp = &plchr[(int)plane.pln_type];
1055 if ((pcp->pl_flags & P_F) == 0)
1057 if (plane.pln_mission != 0)
1059 if (plane.pln_mobil <= 0)
1061 if (plane.pln_effic < 40)
1063 if (plane.pln_ship >= 0) {
1064 if (!can_fly(plane.pln_uid))
1066 getship(plane.pln_ship, &ship);
1067 petrol = ship.shp_item[I_PETROL];
1068 } else if (plane.pln_land >= 0) {
1069 if (!can_fly(plane.pln_uid))
1071 getland(plane.pln_land, &land);
1072 petrol = land.lnd_item[I_PETROL];
1074 getsect(plane.pln_x, plane.pln_y, §);
1075 petrol = sect.sct_item[I_PETROL];
1076 if ((sect.sct_effic < 60 || sect.sct_type != SCT_AIRPT)
1077 && (pcp->pl_flags & P_V) == 0)
1080 if (petrol <= pcp->pl_fuel / 2)
1082 /* Finally, is it in the list of planes already in
1084 if (ac_isflying(&plane, a))
1086 if (ac_isflying(&plane, b))
1088 if (ac_isflying(&plane, c))
1090 if (ac_isflying(&plane, d))
1093 ip = malloc(sizeof(*ip));
1096 ip->pcp = &plchr[(int)plane.pln_type];
1098 emp_insque(&ip->queue, list);
1106 { /* Can this plane fly from the ship or land unit it is on? */
1107 struct plnstr plane;
1110 struct plchrstr *pcp;
1111 struct mchrstr *scp;
1113 getplane(p, &plane);
1114 pcp = &plchr[(int)plane.pln_type];
1116 if (plane.pln_ship >= 0) {
1117 if (!(pcp->pl_flags & P_L) && !(pcp->pl_flags & P_M)
1118 && !(pcp->pl_flags & P_K)
1119 && !(pcp->pl_flags & P_E)
1123 getship(plane.pln_ship, &ship);
1124 scp = &mchr[(int)ship.shp_type];
1126 if ((pcp->pl_flags & P_L) && (scp->m_flags & M_FLY)) {
1130 if ((pcp->pl_flags & P_M) && (scp->m_flags & M_MSL)) {
1134 if ((pcp->pl_flags & P_K) && (scp->m_flags & M_CHOPPER)) {
1138 if ((pcp->pl_flags & P_E) && (scp->m_flags & M_XLIGHT)) {
1143 if (plane.pln_land >= 0) {
1144 if (!(pcp->pl_flags & P_E))
1147 getland(plane.pln_land, &land);
1149 if ((pcp->pl_flags & P_E) && land.lnd_maxlight) {
1158 do_evade(struct emp_qelem *bomb_list, struct emp_qelem *esc_list)
1160 struct emp_qelem *qp;
1165 for (qp = bomb_list->q_forw; qp != bomb_list; qp = qp->q_forw) {
1166 plp = (struct plist *)qp;
1167 if (evade > plp->pcp->pl_stealth / 100.0)
1168 evade = plp->pcp->pl_stealth / 100.0;
1170 for (qp = esc_list->q_forw; qp != esc_list; qp = qp->q_forw) {
1171 plp = (struct plist *)qp;
1172 if (evade > plp->pcp->pl_stealth / 100.0)
1173 evade = plp->pcp->pl_stealth / 100.0;