2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2007, 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 * shpsub.c: Ship subroutine stuff
30 * Known contributors to this file:
32 * Steve McClure, 1996-2000
33 * Markus Armbruster, 2006
49 #include "prototypes.h"
56 static int shp_check_one_mines(struct ulist *);
57 static int shp_hit_mine(struct shpstr *, struct mchrstr *);
58 static void shp_mess(char *, struct ulist *);
61 shp_sel(struct nstr_item *ni, struct emp_qelem *list)
73 while (nxtitem(ni, &ship)) {
76 mcp = &mchr[(int)ship.shp_type];
77 /* if (wantflags && (mcp->m_flags & wantflags) != wantflags)
79 if (nowantflags && mcp->m_flags & nowantflags)
83 if (ontradingblock(EF_SHIP, &ship)) {
84 pr("ship #%d inelligible - it's for sale.\n",
89 /* This abuse is better fixed by building a ship with the normal negative
90 mobility that everything else is built with */
93 if (ship.shp_effic < 21 &&
94 ship.shp_mobil < etu_per_update) {
95 pr("%s needs at least %d mob to navigate.\n",
96 prship(&ship), etu_per_update);
101 ship.shp_mission = 0;
103 memset(ship.shp_rpath, 0, sizeof(ship.shp_rpath));
104 putship(ship.shp_uid, &ship);
105 mlp = malloc(sizeof(struct ulist));
106 mlp->chrp = (struct empobj_chr *)mcp;
107 mlp->unit.ship = ship;
108 mlp->mobil = ship.shp_mobil;
109 emp_insque(&mlp->queue, list);
113 /* This function assumes that the list was created by shp_sel */
115 shp_nav(struct emp_qelem *list, double *minmobp, double *maxmobp,
116 int *togetherp, natid actor)
118 struct emp_qelem *qp;
119 struct emp_qelem *next;
130 for (qp = list->q_back; qp != list; qp = next) {
132 mlp = (struct ulist *)qp;
133 getship(mlp->unit.ship.shp_uid, &ship);
134 if (ship.shp_own != actor) {
135 mpr(actor, "%s was sunk at %s\n",
136 prship(&ship), xyas(ship.shp_x, ship.shp_y, actor));
137 emp_remque((struct emp_qelem *)mlp);
142 if (*ship.shp_path && !update_pending) {
143 shp_mess("has a sail path", mlp);
144 mpr(actor, "Use `sail <#> -' to reset\n");
148 /* check crew - uws don't count */
149 if (ship.shp_item[I_MILIT] == 0 && ship.shp_item[I_CIVIL] == 0) {
150 shp_mess("is crewless", mlp);
153 if (!getsect(ship.shp_x, ship.shp_y, §)) {
154 shp_mess("was sucked into the sky by a strange looking spaceship", mlp); /* heh -KHS */
157 switch (shp_check_nav(§, &ship)) {
158 case CN_CONSTRUCTION:
159 shp_mess("is caught in a construction zone", mlp);
162 shp_mess("is landlocked", mlp);
168 shp_mess("was just swallowed by a big green worm", mlp);
176 if (ship.shp_x != allx || ship.shp_y != ally)
178 if (ship.shp_mobil + 1 < (int)mlp->mobil) {
179 mlp->mobil = ship.shp_mobil;
181 if (mlp->mobil < *minmobp)
182 *minmobp = mlp->mobil;
183 if (mlp->mobil > *maxmobp)
184 *maxmobp = mlp->mobil;
185 mlp->unit.ship = ship;
190 shp_put(struct emp_qelem *list, natid actor)
192 struct emp_qelem *qp;
193 struct emp_qelem *newqp;
198 mlp = (struct ulist *)qp;
199 mpr(actor, "%s stopped at %s\n", prship(&mlp->unit.ship),
200 xyas(mlp->unit.ship.shp_x, mlp->unit.ship.shp_y,
201 mlp->unit.ship.shp_own));
202 mlp->unit.ship.shp_mobil = (int)mlp->mobil;
203 putship(mlp->unit.ship.shp_uid, &mlp->unit.ship);
212 shp_sweep(struct emp_qelem *ship_list, int verbose, int takemob, natid actor)
214 struct emp_qelem *qp;
215 struct emp_qelem *next;
218 int mines, m, max, shells;
222 for (qp = ship_list->q_back; qp != ship_list; qp = next) {
224 mlp = (struct ulist *)qp;
225 if (!(((struct mchrstr *)mlp->chrp)->m_flags & M_SWEEP)) {
227 mpr(actor, "%s doesn't have minesweeping capability!\n",
228 prship(&mlp->unit.ship));
231 if (takemob && mlp->mobil <= 0.0) {
233 mpr(actor, "%s is out of mobility!\n",
234 prship(&mlp->unit.ship));
237 getsect(mlp->unit.ship.shp_x, mlp->unit.ship.shp_y, §);
238 if (sect.sct_type != SCT_WATER) {
240 mpr(actor, "%s is not at sea. No mines there!\n",
241 prship(&mlp->unit.ship));
245 mlp->mobil -= shp_mobcost(&mlp->unit.ship);
246 mlp->unit.ship.shp_mobil = (int)mlp->mobil;
248 putship(mlp->unit.ship.shp_uid, &mlp->unit.ship);
249 if (!(mines = sect.sct_mines))
251 max = ((struct mchrstr *)mlp->chrp)->m_item[I_SHELL];
252 shells = mlp->unit.ship.shp_item[I_SHELL];
253 for (m = 0; mines > 0 && m < 5; m++) {
255 mpr(actor, "Sweep...\n");
257 shells = MIN(max, shells + 1);
258 changed |= map_set(actor, sect.sct_x, sect.sct_y, 'X', 0);
261 sect.sct_mines = mines;
262 mlp->unit.ship.shp_item[I_SHELL] = shells;
263 if (shp_check_one_mines(mlp)) {
268 putship(mlp->unit.ship.shp_uid, &mlp->unit.ship);
277 shp_check_one_mines(struct ulist *mlp)
282 getsect(mlp->unit.ship.shp_x, mlp->unit.ship.shp_y, §);
283 if (sect.sct_type != SCT_WATER)
287 if (chance(DMINE_HITCHANCE(sect.sct_mines))) {
288 actor = mlp->unit.ship.shp_own;
289 shp_hit_mine(&mlp->unit.ship, ((struct mchrstr *)mlp->chrp));
291 if (map_set(actor, sect.sct_x, sect.sct_y, 'X', 0))
294 putship(mlp->unit.ship.shp_uid, &mlp->unit.ship);
295 if (!mlp->unit.ship.shp_own)
302 shp_check_mines(struct emp_qelem *ship_list)
304 struct emp_qelem *qp;
305 struct emp_qelem *next;
309 for (qp = ship_list->q_back; qp != ship_list; qp = next) {
311 mlp = (struct ulist *)qp;
312 if (shp_check_one_mines(mlp)) {
322 shp_list(struct emp_qelem *ship_list)
324 struct emp_qelem *qp;
325 struct emp_qelem *next;
329 pr("shp# ship type x,y fl eff mil sh gun pn he xl ln mob tech\n");
331 for (qp = ship_list->q_back; qp != ship_list; qp = next) {
333 mlp = (struct ulist *)qp;
334 shp = &mlp->unit.ship;
335 pr("%4d ", shp->shp_uid);
336 pr("%-16.16s ", ((struct mchrstr *)mlp->chrp)->m_name);
337 prxy("%4d,%-4d ", shp->shp_x, shp->shp_y, mlp->unit.ship.shp_own);
338 pr("%1.1s", &shp->shp_fleet);
339 pr("%4d%%", shp->shp_effic);
340 pr("%4d", shp->shp_item[I_MILIT]);
341 pr("%4d", shp->shp_item[I_SHELL]);
342 pr("%4d", shp->shp_item[I_GUN]);
344 pr("%3d", shp->shp_nplane);
345 pr("%3d", shp->shp_nchoppers);
346 pr("%3d", shp->shp_nxlight);
348 pr("%3d", shp->shp_nland);
349 pr("%4d", shp->shp_mobil);
350 pr("%4d\n", shp->shp_tech);
355 shp_mess(char *str, struct ulist *mlp)
357 mpr(mlp->unit.ship.shp_own, "%s %s & stays in %s\n",
358 prship(&mlp->unit.ship),
359 str, xyas(mlp->unit.ship.shp_x, mlp->unit.ship.shp_y,
360 mlp->unit.ship.shp_own));
361 mlp->unit.ship.shp_mobil = (int)mlp->mobil;
362 putship(mlp->unit.ship.shp_uid, &mlp->unit.ship);
363 emp_remque((struct emp_qelem *)mlp);
368 shp_check_nav(struct sctstr *sect, struct shpstr *shp)
370 switch (dchr[sect->sct_type].d_nav) {
374 if (mchr[(int)shp->shp_type].m_flags & M_CANAL) {
375 if (sect->sct_effic < 2)
376 return CN_CONSTRUCTION;
378 return CN_LANDLOCKED;
381 if (sect->sct_effic < 2)
382 return CN_CONSTRUCTION;
385 if (sect->sct_effic < 60)
386 return CN_CONSTRUCTION;
389 return CN_LANDLOCKED;
395 sect_has_dock(struct sctstr *sect)
397 switch (dchr[sect->sct_type].d_nav) {
407 shp_count(struct emp_qelem *list, int wantflags, int nowantflags,
410 struct emp_qelem *qp;
411 struct emp_qelem *next;
415 for (qp = list->q_back; qp != list; qp = next) {
417 mlp = (struct ulist *)qp;
418 if (mlp->unit.ship.shp_x != x || mlp->unit.ship.shp_y != y)
421 (((struct mchrstr *)mlp->chrp)->m_flags & wantflags) != wantflags)
424 ((struct mchrstr *)mlp->chrp)->m_flags & nowantflags)
432 shp_damage_one(struct ulist *mlp, int dam)
434 shipdamage(&mlp->unit.ship, dam);
435 putship(mlp->unit.ship.shp_uid, &mlp->unit.ship);
436 if (!mlp->unit.ship.shp_own) {
437 emp_remque((struct emp_qelem *)mlp);
443 shp_damage(struct emp_qelem *list, int totdam, int wantflags,
444 int nowantflags, int x, int y)
446 struct emp_qelem *qp;
447 struct emp_qelem *next;
453 || !(count = shp_count(list, wantflags, nowantflags, x, y)))
455 dam = ldround((double)totdam / count, 1);
456 for (qp = list->q_back; qp != list; qp = next) {
458 mlp = (struct ulist *)qp;
459 if (mlp->unit.ship.shp_x != x || mlp->unit.ship.shp_y != y)
462 (((struct mchrstr *)mlp->chrp)->m_flags & wantflags) != wantflags)
465 ((struct mchrstr *)mlp->chrp)->m_flags & nowantflags)
467 shp_damage_one(mlp, dam);
473 shp_contains(struct emp_qelem *list, int newx, int newy, int wantflags,
476 struct emp_qelem *qp;
477 struct emp_qelem *next;
480 for (qp = list->q_back; qp != list; qp = next) {
482 mlp = (struct ulist *)qp;
483 /* If the ship isn't in the requested sector, then continue */
484 if (newx != mlp->unit.ship.shp_x || newy != mlp->unit.ship.shp_y)
487 (((struct mchrstr *)mlp->chrp)->m_flags & wantflags) != wantflags)
490 ((struct mchrstr *)mlp->chrp)->m_flags & nowantflags)
497 static struct ulist *
498 most_valuable_ship(struct emp_qelem *list)
500 struct emp_qelem *qp;
501 struct emp_qelem *next;
503 struct ulist *mvs = 0;
505 for (qp = list->q_back; qp != list; qp = next) {
507 mlp = (struct ulist *)qp;
508 if (((struct mchrstr *)mlp->chrp)->m_flags & M_SUB)
510 if (!((struct mchrstr *)mlp->chrp)->m_nxlight &&
511 !((struct mchrstr *)mlp->chrp)->m_nchoppers &&
512 ((struct mchrstr *)mlp->chrp)->m_cost < 1000 &&
513 !((struct mchrstr *)mlp->chrp)->m_nplanes &&
514 !((struct mchrstr *)mlp->chrp)->m_nland)
520 if (((struct mchrstr *)mlp->chrp)->m_cost * mlp->unit.ship.shp_effic >
521 ((struct mchrstr *)mlp->chrp)->m_cost * mvs->unit.ship.shp_effic)
528 shp_easiest_target(struct emp_qelem *list, int wantflags, int nowantflags)
530 struct emp_qelem *qp;
531 struct emp_qelem *next;
534 int easiest = 9876; /* things start great for victim */
537 for (qp = list->q_back; qp != list; qp = next) {
539 mlp = (struct ulist *)qp;
541 (((struct mchrstr *)mlp->chrp)->m_flags & wantflags) != wantflags)
544 ((struct mchrstr *)mlp->chrp)->m_flags & nowantflags)
546 hard = shp_hardtarget(&mlp->unit.ship);
548 easiest = hard; /* things get worse for victim */
551 return easiest - count;
555 shp_missile_interdiction(struct emp_qelem *list, coord newx, coord newy,
561 struct emp_qelem msl_list, *qp, *newqp;
565 msl_sel(&msl_list, newx, newy, victim, P_T | P_MAR, 0, MI_INTERDICT);
568 while (!QEMPTY(&msl_list) && (mvs = most_valuable_ship(list))) {
569 sprintf(what, "%s", prship(&mvs->unit.ship));
570 dam = msl_launch_mindam(&msl_list, newx, newy,
571 shp_hardtarget(&mvs->unit.ship),
572 EF_SHIP, 1, what, victim, MI_INTERDICT);
575 "missile interdiction mission does %d damage to %s!\n",
577 shp_damage_one(mvs, dam);
580 } else if (++twotries >= 2) {
584 qp = msl_list.q_forw;
585 while (qp != msl_list.q_forw) {
595 /* Note that this function has a side effect - it uses coastwatch
596 * ranges to see if it should fire upon a ship. So, this function
597 * is expected to return positive if a ship is in range, and 0 if a
598 * ship is not in range. */
600 notify_coastguard(struct emp_qelem *list, int trange, struct sctstr *sectp)
602 struct emp_qelem *qp;
603 struct emp_qelem *next;
608 natp = getnatp(sectp->sct_own);
610 vrange = sectp->sct_type == SCT_RADAR ? 14 : 4;
611 vrange *= tfact(sectp->sct_own, 1.0) * sectp->sct_effic / 100.0;
619 for (qp = list->q_back; qp != list; qp = next) {
621 mlp = (struct ulist *)qp;
622 if (((struct mchrstr *)mlp->chrp)->m_flags & M_SUB)
624 if (natp->nat_flags & NF_COASTWATCH)
625 wu(0, sectp->sct_own,
626 "%s %s sighted at %s\n",
627 cname(mlp->unit.ship.shp_own),
628 prship(&mlp->unit.ship),
629 xyas(mlp->unit.ship.shp_x, mlp->unit.ship.shp_y,
632 setcont(sectp->sct_own, mlp->unit.ship.shp_own, FOUND_COAST);
639 shp_fort_interdiction(struct emp_qelem *list, coord newx, coord newy,
649 signed char notified[MAXNOC];
652 /* Inform neutral and worse */
653 for (i = 0; i < MAXNOC; ++i) {
654 if (getrel(getnatp(i), victim) <= NEUTRAL)
660 snxtsct_dist(&ns, newx, newy, fort_max_interdiction_range);
661 while (nxtsct(&ns, &fsect)) {
664 if (fsect.sct_own == victim)
666 if (notified[fsect.sct_own])
668 trange = mapdist(newx, newy, fsect.sct_x, fsect.sct_y);
669 if (notify_coastguard(list, trange, &fsect))
670 notified[fsect.sct_own] = 1;
672 if (opt_NO_FORT_FIRE)
673 return 0; /* Only coastwatch notify in nofortfire */
674 /* Only fire at Hostile ships */
675 for (i = 0; i < MAXNOC; ++i) {
676 if (getrel(getnatp(i), victim) >= NEUTRAL)
679 snxtsct_dist(&ns, newx, newy, fort_max_interdiction_range);
680 while (nxtsct(&ns, &fsect)) {
681 if (!notified[fsect.sct_own])
683 gun = fsect.sct_item[I_GUN];
686 range = roundrange(fortrange(&fsect));
687 trange = mapdist(newx, newy, fsect.sct_x, fsect.sct_y);
690 if (fsect.sct_item[I_MILIT] < 5)
692 shell = fsect.sct_item[I_SHELL];
694 shell += supply_commod(fsect.sct_own, fsect.sct_x, fsect.sct_y,
699 fsect.sct_item[I_SHELL] = shell;
703 guneff = landgun((int)fsect.sct_effic, gun);
706 mpr(victim, "Incoming fire does %d damage!\n", dam);
708 mpr(victim, "%s fires at you for %d!\n",
709 xyas(fsect.sct_x,fsect.sct_y,victim),
713 "%s fires at %s ships in %s for %d!\n",
714 xyas(fsect.sct_x, fsect.sct_y,
716 cname(victim), xyas(newx, newy, fsect.sct_own), dam);
717 nreport(fsect.sct_own, N_SHP_SHELL, victim, 1);
720 return shp_damage(list, totdam, 0, M_SUB, newx, newy);
725 shp_interdict(struct emp_qelem *list, coord newx, coord newy, natid victim)
729 if (shp_contains(list, newx, newy, 0, M_SUB)) {
730 stopping |= shp_fort_interdiction(list, newx, newy, victim);
732 if (shp_contains(list, newx, newy, 0, M_SUB)) {
735 unit_interdict(newx, newy, victim, "ships",
736 shp_easiest_target(list, 0, M_SUB),
738 0, M_SUB, newx, newy);
739 if (most_valuable_ship(list)) {
741 shp_missile_interdiction(list, newx, newy, victim);
745 if (shp_contains(list, newx, newy, M_SUB, 0)) {
748 unit_interdict(newx, newy, victim, "subs",
749 shp_easiest_target(list, M_SUB, 0),
751 M_SUB, 0, newx, newy);
756 /* high value of hardtarget is harder to hit */
758 shp_hardtarget(struct shpstr *sp)
762 struct mchrstr *mcp = mchr + sp->shp_type;
765 getsect(sp->shp_x, sp->shp_y, §);
766 onsea = sect.sct_type == SCT_WATER;
767 if (mcp->m_flags & M_SUB)
769 return (int)((sp->shp_effic / 100.0) *
770 (20 + sp->shp_speed * onsea / 2.0 - vis));
774 shp_hit_mine(struct shpstr *sp, struct mchrstr *mcp)
778 mpr(sp->shp_own, "Kawhomp! Mine detected in %s!\n",
779 xyas(sp->shp_x, sp->shp_y, sp->shp_own));
781 nreport(sp->shp_own, N_HIT_MINE, 0, 1);
784 if (mcp->m_flags & M_SWEEP)
787 shipdamage(sp, ldround(m, 1));
793 shp_view(struct emp_qelem *list)
796 struct emp_qelem *qp;
797 struct emp_qelem *next;
800 for (qp = list->q_back; qp != list; qp = next) {
802 mlp = (struct ulist *)qp;
803 getsect(mlp->unit.ship.shp_x, mlp->unit.ship.shp_y, §);
804 if (((struct mchrstr *)mlp->chrp)->m_flags & M_FOOD)
805 mpr(mlp->unit.ship.shp_own, "[fert:%d] ", sect.sct_fertil);
806 if (((struct mchrstr *)mlp->chrp)->m_flags & M_OIL)
807 mpr(mlp->unit.ship.shp_own, "[oil:%d] ", sect.sct_oil);
808 mpr(mlp->unit.ship.shp_own, "%s @ %s %d%% %s\n",
809 prship(&mlp->unit.ship),
810 xyas(mlp->unit.ship.shp_x, mlp->unit.ship.shp_y, player->cnum),
811 sect.sct_effic, dchr[sect.sct_type].d_name);
816 shp_nav_one_sector(struct emp_qelem *list, int dir, natid actor,
820 struct emp_qelem *qp;
821 struct emp_qelem *next;
823 struct emp_qelem done;
830 double tech; /* for mapping */
831 double tf; /* for mapping */
835 if (dir <= DIR_STOP || dir >= DIR_VIEW) {
836 shp_put(list, actor);
841 for (qp = list->q_back; qp != list; qp = next) {
843 mlp = (struct ulist *)qp;
844 newx = xnorm(mlp->unit.ship.shp_x + dx);
845 newy = ynorm(mlp->unit.ship.shp_y + dy);
846 getsect(newx, newy, §);
847 navigate = shp_check_nav(§, &mlp->unit.ship);
848 if (navigate != CN_NAVIGABLE ||
849 (sect.sct_own && actor != sect.sct_own &&
850 getrel(getnatp(sect.sct_own), actor) < FRIENDLY)) {
851 if (dchr[sect.sct_type].d_nav == NAV_CANAL &&
852 !(((struct mchrstr *)mlp->chrp)->m_flags & M_CANAL) &&
853 navigate == CN_LANDLOCKED)
855 "is too large to fit into the canal system at %s",
856 xyas(newx, newy, actor));
858 sprintf(dp, "can't go to %s", xyas(newx, newy, actor));
860 mpr(actor, "%s\n", dp);
868 if (mlp->mobil <= 0.0) {
869 shp_mess("is out of mobility", mlp);
872 mobcost = shp_mobcost(&mlp->unit.ship);
873 mlp->unit.ship.shp_x = newx;
874 mlp->unit.ship.shp_y = newy;
875 if (mlp->mobil - mobcost < -127) {
878 mlp->mobil -= mobcost;
880 mlp->unit.ship.shp_mobil = (int)mlp->mobil;
881 putship(mlp->unit.ship.shp_uid, &mlp->unit.ship);
883 /* Now update the map for this ship */
884 tech = techfact(mlp->unit.ship.shp_tech,
885 ((struct mchrstr *)mlp->chrp)->m_vrnge);
886 if (((struct mchrstr *)mlp->chrp)->m_flags & M_SONAR)
887 tf = techfact(mlp->unit.ship.shp_tech, 1.0);
890 radmapupd(mlp->unit.ship.shp_own,
891 mlp->unit.ship.shp_x, mlp->unit.ship.shp_y,
892 (int)mlp->unit.ship.shp_effic, (int)tech, tf);
896 stopping |= shp_sweep(list, 0, 0, actor);
899 stopping |= shp_check_mines(list);
903 /* interdict ships sector by sector */
905 while (!QEMPTY(list)) {
906 mlp = (struct ulist *)list->q_back;
907 newx = mlp->unit.ship.shp_x;
908 newy = mlp->unit.ship.shp_y;
909 stopping |= shp_interdict(list, newx, newy, actor);
910 /* move survivors in this sector to done */
911 for (qp = list->q_back; qp != list; qp = next) {
913 mlp = (struct ulist *)qp;
914 if (mlp->unit.ship.shp_x == newx &&
915 mlp->unit.ship.shp_y == newy) {
917 emp_insque(qp, &done);
921 /* assign surviving ships back to list */
922 emp_insque(list, &done);
930 * Check for incoming missiles with a P_MAR flag.
931 * Return True=1 if the missile was shotdown.
934 * Chad Zabel, July 95
938 shp_missile_defense(coord dx, coord dy, natid bombown, int hardtarget)
944 double gun, eff, teff;
946 snxtitem_dist(&ni, EF_SHIP, dx, dy, 1);
948 while (nxtitem(&ni, &ship)) {
952 if (!(mchr[(int)ship.shp_type].m_flags & M_ANTIMISSILE))
955 if (getrel(getnatp(ship.shp_own), bombown) >= NEUTRAL)
958 if (ship.shp_effic < 60)
961 shell = ship.shp_item[I_SHELL];
962 if (ship.shp_item[I_MILIT] < 1) /* do we have mil? */
964 if (shell < 2) { /* do we need shells */
965 shell += supply_commod(ship.shp_own, ship.shp_x, ship.shp_y,
970 if (ship.shp_item[I_GUN] < 1) /* we need at least 1 gun */
973 /* now calculate the odds */
974 gun = MIN(ship.shp_item[I_GUN], ship.shp_glim);
975 eff = ship.shp_effic / 100.0;
976 teff = ship.shp_tech / (ship.shp_tech + 200.0);
977 /* raise 4.5 for better interception -KHS */
978 hitchance = (int)(gun * eff * teff * 4.5) - hardtarget;
984 mpr(bombown, "%s anti-missile system activated...",
985 cname(ship.shp_own));
986 mpr(ship.shp_own, "Ship #%i anti-missile system activated!\n",
988 mpr(ship.shp_own, "%d%% hitchance...", hitchance);
990 ship.shp_item[I_SHELL] = shell - 2;
991 putship(ship.shp_uid, &ship);
993 if (roll(100) <= hitchance) {
994 mpr(bombown, "KABOOOM!! Missile destroyed\n\n");
996 "KABOOOM!! Incoming missile destroyed!\n\n");
999 mpr(bombown, "SWOOSH!! anti-missile system failed!!\n");
1001 "SWOOSH!! Missile evades anti-missile systems\n\n");
1004 return 0; /* all attempts failed */
1008 shp_path(int together, struct shpstr *shp, char *buf)
1012 struct sctstr d_sect;
1015 if (!sarg_xy(buf, &destx, &desty))
1019 "Cannot go to a destination sector if not all starting in the same sector\n");
1022 if (!getsect(destx, desty, &d_sect)) {
1023 mpr(shp->shp_own, "%d,%d is not a sector\n", destx, desty);
1027 cp = BestShipPath(buf, shp->shp_x, shp->shp_y,
1028 d_sect.sct_x, d_sect.sct_y, player->cnum);
1029 if (!cp || shp->shp_mobil <= 0) {
1030 mpr(shp->shp_own, "Can't get to '%s' right now.\n",
1031 xyas(d_sect.sct_x, d_sect.sct_y, player->cnum));
1037 /* Fire missiles at a ship which has fired shells */
1039 shp_missdef(struct shpstr *sp, natid victim)
1041 struct emp_qelem list;
1048 mlp = malloc(sizeof(struct ulist));
1049 mlp->chrp = (struct empobj_chr *)&mchr[(int)sp->shp_type];
1050 mlp->unit.ship = *sp;
1051 mlp->mobil = sp->shp_mobil;
1052 emp_insque(&mlp->queue, &list);
1053 sprintf(buf, "%s", prship(&mlp->unit.ship));
1055 eff = sp->shp_effic;
1056 if (most_valuable_ship(&list)) {
1057 shp_missile_interdiction(&list, sp->shp_x, sp->shp_y, sp->shp_own);
1058 getship(sp->shp_uid, sp);
1062 "missiles launched in defense did 100%% damage to %s\n",
1064 wu(0, victim, "%s sunk!\n", buf);
1065 } else if (eff > 0 && sp->shp_effic < eff) {
1067 "missiles launched in defense did %d%% damage to %s\n",
1068 100 * (eff - sp->shp_effic) / eff, buf);
1076 shp_mobcost(struct shpstr *sp)
1078 return speed_factor(sp->shp_effic * 0.01 * sp->shp_speed,
1083 * Set SP's tech to TLEV along with everything else that depends on it.
1086 shp_set_tech(struct shpstr *sp, int tlev)
1088 struct mchrstr *mcp = mchr + sp->shp_type;
1089 int tech_diff = tlev - mcp->m_tech;
1091 if (CANT_HAPPEN(tech_diff < 0)) {
1096 sp->shp_tech = tlev;
1097 sp->shp_armor = (short)SHP_DEF(mcp->m_armor, tech_diff);
1098 sp->shp_speed = (short)SHP_SPD(mcp->m_speed, tech_diff);
1099 sp->shp_visib = (short)SHP_VIS(mcp->m_visib, tech_diff);
1100 sp->shp_frnge = (short)SHP_RNG(mcp->m_frnge, tech_diff);
1101 sp->shp_glim = (short)SHP_FIR(mcp->m_glim, tech_diff);