2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-1999, 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 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.
28 * shpsub.c: Ship subroutine stuff
30 * Known contributors to this file:
32 * Steve McClure, 1996-2000
53 #include "prototypes.h"
55 extern double tfactfire(natid, double);
57 extern int etu_per_update;
59 static int shp_check_nav(struct sctstr *);
60 static int shp_check_one_mines(struct mlist *);
61 static int shp_hit_mine(struct shpstr *, struct mchrstr *);
62 static void shp_mess(s_char *, struct mlist *);
65 shp_sel(struct nstr_item *ni, struct emp_qelem *list)
77 while (nxtitem(ni, (s_char *)&ship)) {
80 mcp = &mchr[(int)ship.shp_type];
81 /* if (wantflags && (mcp->m_flags & wantflags) != wantflags)
83 if (nowantflags && mcp->m_flags & nowantflags)
87 if (ontradingblock(EF_SHIP, (int *)&ship)) {
88 pr("ship #%d inelligible - it's for sale.\n",
93 /* This abuse is better fixed by building a ship with the normal negative
94 mobility that everything else is built with */
97 if (ship.shp_effic < 21 &&
98 ship.shp_mobil < etu_per_update) {
99 pr("%s needs at least %d mob to navigate.\n",
100 prship(&ship), etu_per_update);
105 ship.shp_mission = 0;
107 memset(ship.shp_rpath, 0, sizeof(ship.shp_rpath));
108 putship(ship.shp_uid, &ship);
109 mlp = (struct mlist *)malloc(sizeof(struct mlist));
112 mlp->mobil = (double)ship.shp_mobil;
113 emp_insque(&mlp->queue, list);
117 /* This function assumes that the list was created by shp_sel */
119 shp_nav(struct emp_qelem *list, double *minmobp, double *maxmobp,
120 int *togetherp, natid actor)
122 extern int update_pending;
123 struct emp_qelem *qp;
124 struct emp_qelem *next;
136 for (qp = list->q_back; qp != list; qp = next) {
138 mlp = (struct mlist *)qp;
139 getship(mlp->ship.shp_uid, &ship);
140 if (ship.shp_own != actor) {
141 mpr(actor, "%s was sunk at %s\n",
142 prship(&ship), xyas(ship.shp_x, ship.shp_y, actor));
143 emp_remque((struct emp_qelem *)mlp);
148 if (*ship.shp_path && !update_pending) {
149 shp_mess("has a sail path", mlp);
150 mpr(actor, "Use `sail <#> -' to reset\n");
154 /* check crew - uws don't count */
155 getvec(VT_ITEM, vec, (s_char *)&ship, EF_SHIP);
156 if (vec[I_MILIT] == 0 && vec[I_CIVIL] == 0) {
157 shp_mess("is crewless", mlp);
160 if (!getsect(ship.shp_x, ship.shp_y, §)) {
161 shp_mess("was sucked into the sky by a strange looking spaceship", mlp); /* heh -KHS */
164 switch (shp_check_nav(§)) {
165 case CN_CONSTRUCTION:
166 shp_mess("is caught in a construction zone", mlp);
169 shp_mess("is landlocked", mlp);
175 shp_mess("was just swallowed by a big green worm", mlp);
183 if (ship.shp_x != allx || ship.shp_y != ally)
185 if (ship.shp_mobil + 1 < (int)mlp->mobil) {
186 mlp->mobil = (double)ship.shp_mobil;
188 if (mlp->mobil < *minmobp)
189 *minmobp = mlp->mobil;
190 if (mlp->mobil > *maxmobp)
191 *maxmobp = mlp->mobil;
197 shp_put(struct emp_qelem *list, natid actor)
199 register struct emp_qelem *qp;
200 register struct emp_qelem *newqp;
205 mlp = (struct mlist *)qp;
206 mpr(actor, "%s stopped at %s\n", prship(&mlp->ship),
207 xyas(mlp->ship.shp_x, mlp->ship.shp_y, mlp->ship.shp_own));
208 mlp->ship.shp_mobil = (int)mlp->mobil;
209 putship(mlp->ship.shp_uid, &mlp->ship);
218 shp_sweep(struct emp_qelem *ship_list, int verbose, natid actor)
220 struct emp_qelem *qp;
221 struct emp_qelem *next;
224 int mines, m, max, shells;
229 for (qp = ship_list->q_back; qp != ship_list; qp = next) {
231 mlp = (struct mlist *)qp;
232 if (!(mlp->mcp->m_flags & M_SWEEP)) {
234 mpr(actor, "%s doesn't have minesweeping capability!\n",
238 if (mlp->mobil <= 0.0) {
240 mpr(actor, "%s is out of mobility!\n", prship(&mlp->ship));
243 getsect(mlp->ship.shp_x, mlp->ship.shp_y, §);
244 if (sect.sct_type != SCT_WATER) {
246 mpr(actor, "%s is not at sea. No mines there!\n",
250 mobcost = mlp->ship.shp_effic * 0.01 * mlp->ship.shp_speed;
251 mobcost = 480.0 / (mobcost +
252 techfact(mlp->ship.shp_tech, mobcost));
253 mlp->mobil -= mobcost;
254 mlp->ship.shp_mobil = (int)mlp->mobil;
255 putship(mlp->ship.shp_uid, &mlp->ship);
256 if (!(mines = getvar(V_MINE, (s_char *)§, EF_SECTOR)))
258 max = vl_find(V_SHELL, mlp->mcp->m_vtype,
259 mlp->mcp->m_vamt, (int)mlp->mcp->m_nv);
260 shells = getvar(V_SHELL, (s_char *)&mlp->ship, EF_SHIP);
261 for (m = 0; mines > 0 && m < 5; m++) {
263 mpr(actor, "Sweep...\n");
265 shells = min(max, shells + 1);
266 changed |= map_set(actor, sect.sct_x, sect.sct_y, 'X', 0);
269 putvar(V_MINE, mines, (s_char *)§, EF_SECTOR);
270 putvar(V_SHELL, shells, (s_char *)&mlp->ship, EF_SHIP);
271 if (shp_check_one_mines(mlp)) {
276 putship(mlp->ship.shp_uid, &mlp->ship);
285 shp_check_one_mines(struct mlist *mlp)
292 getsect(mlp->ship.shp_x, mlp->ship.shp_y, §);
293 if (sect.sct_type != SCT_WATER)
295 if (!(mines = getvar(V_MINE, (s_char *)§, EF_SECTOR)))
297 if (chance(DMINE_HITCHANCE(mines))) {
298 actor = mlp->ship.shp_own;
299 shp_hit_mine(&mlp->ship, mlp->mcp);
301 changed |= map_set(actor, sect.sct_x, sect.sct_y, 'X', 0);
304 putvar(V_MINE, mines, (s_char *)§, EF_SECTOR);
306 putship(mlp->ship.shp_uid, (s_char *)&mlp->ship);
307 if (!mlp->ship.shp_own)
314 shp_check_mines(struct emp_qelem *ship_list)
316 struct emp_qelem *qp;
317 struct emp_qelem *next;
321 for (qp = ship_list->q_back; qp != ship_list; qp = next) {
323 mlp = (struct mlist *)qp;
324 if (shp_check_one_mines(mlp)) {
334 shp_list(struct emp_qelem *ship_list)
336 struct emp_qelem *qp;
337 struct emp_qelem *next;
342 pr("shp# ship type x,y fl eff mil sh gun pn he xl ln mob tech\n");
344 for (qp = ship_list->q_back; qp != ship_list; qp = next) {
346 mlp = (struct mlist *)qp;
348 pr("%4d ", shp->shp_uid);
349 pr("%-16.16s ", mlp->mcp->m_name);
350 prxy("%4d,%-4d ", shp->shp_x, shp->shp_y, mlp->ship.shp_own);
351 pr("%1c", shp->shp_fleet);
352 pr("%4d%%", shp->shp_effic);
353 getvec(VT_ITEM, vec, (s_char *)shp, EF_SHIP);
354 pr("%4d", vec[I_MILIT]);
355 pr("%4d", vec[I_SHELL]);
356 pr("%4d", vec[I_GUN]);
358 pr("%3d", shp->shp_nplane);
359 pr("%3d", shp->shp_nchoppers);
360 pr("%3d", shp->shp_nxlight);
362 pr("%3d", shp->shp_nland);
363 pr("%4d", shp->shp_mobil);
364 pr("%4d\n", shp->shp_tech);
369 shp_mess(s_char *str, struct mlist *mlp)
371 mpr(mlp->ship.shp_own, "%s %s & stays in %s\n",
373 str, xyas(mlp->ship.shp_x, mlp->ship.shp_y, mlp->ship.shp_own));
374 mlp->ship.shp_mobil = (int)mlp->mobil;
375 putship(mlp->ship.shp_uid, &mlp->ship);
376 emp_remque((struct emp_qelem *)mlp);
381 shp_check_nav(struct sctstr *sect)
383 extern struct dchrstr dchr[];
385 switch (dchr[sect->sct_type].d_flg & 03) {
390 if (sect->sct_effic < 2)
391 return CN_CONSTRUCTION;
394 if (sect->sct_effic < 60)
395 return CN_CONSTRUCTION;
398 return CN_LANDLOCKED;
404 shp_count(struct emp_qelem *list, int wantflags, int nowantflags, int x,
407 struct emp_qelem *qp;
408 struct emp_qelem *next;
412 for (qp = list->q_back; qp != list; qp = next) {
414 mlp = (struct mlist *)qp;
415 if (mlp->ship.shp_x != x || mlp->ship.shp_y != y)
417 if (wantflags && (mlp->mcp->m_flags & wantflags) != wantflags)
419 if (nowantflags && mlp->mcp->m_flags & nowantflags)
427 shp_damage_one(struct mlist *mlp, int dam)
429 shipdamage(&mlp->ship, dam);
430 putship(mlp->ship.shp_uid, &mlp->ship);
431 if (!mlp->ship.shp_own) {
432 emp_remque((struct emp_qelem *)mlp);
438 shp_damage(struct emp_qelem *list, int totdam, int wantflags,
439 int nowantflags, int x, int y)
441 struct emp_qelem *qp;
442 struct emp_qelem *next;
448 || !(count = shp_count(list, wantflags, nowantflags, x, y)))
450 dam = ldround(((double)totdam / (double)count), 1);
451 for (qp = list->q_back; qp != list; qp = next) {
453 mlp = (struct mlist *)qp;
454 if (mlp->ship.shp_x != x || mlp->ship.shp_y != y)
456 if (wantflags && (mlp->mcp->m_flags & wantflags) != wantflags)
458 if (nowantflags && mlp->mcp->m_flags & nowantflags)
460 shp_damage_one(mlp, dam);
466 shp_contains(struct emp_qelem *list, int newx, int newy, int wantflags,
469 struct emp_qelem *qp;
470 struct emp_qelem *next;
473 for (qp = list->q_back; qp != list; qp = next) {
475 mlp = (struct mlist *)qp;
476 /* If the ship isn't in the requested sector, then continue */
477 if (newx != mlp->ship.shp_x || newy != mlp->ship.shp_y)
479 if (wantflags && (mlp->mcp->m_flags & wantflags) != wantflags)
481 if (nowantflags && mlp->mcp->m_flags & nowantflags)
488 static struct mlist *
489 most_valuable_ship(struct emp_qelem *list)
491 struct emp_qelem *qp;
492 struct emp_qelem *next;
494 struct mlist *mvs = 0;
496 for (qp = list->q_back; qp != list; qp = next) {
498 mlp = (struct mlist *)qp;
499 if (mlp->mcp->m_flags & M_SUB)
501 if (!mlp->mcp->m_nxlight &&
502 !mlp->mcp->m_nchoppers &&
503 mlp->mcp->m_cost < 1000 &&
504 !mlp->mcp->m_nplanes && !mlp->mcp->m_nland)
510 if (mlp->mcp->m_cost * mlp->ship.shp_effic >
511 mvs->mcp->m_cost * mvs->ship.shp_effic)
518 shp_easiest_target(struct emp_qelem *list, int wantflags, int nowantflags)
520 struct emp_qelem *qp;
521 struct emp_qelem *next;
524 int easiest = 9876; /* things start great for victim */
527 for (qp = list->q_back; qp != list; qp = next) {
529 mlp = (struct mlist *)qp;
530 if (wantflags && (mlp->mcp->m_flags & wantflags) != wantflags)
532 if (nowantflags && mlp->mcp->m_flags & nowantflags)
534 hard = shp_hardtarget(&mlp->ship);
536 easiest = hard; /* things get worse for victim */
539 return easiest - count;
543 shp_missile_interdiction(struct emp_qelem *list, coord newx, coord newy,
549 struct emp_qelem msl_list, *qp, *newqp;
553 msl_sel(&msl_list, newx, newy, victim, P_T | P_MAR, 0, MI_INTERDICT);
556 while (!QEMPTY(&msl_list) && (mvs = most_valuable_ship(list))) {
557 sprintf(what, "%s", prship(&mvs->ship));
558 dam = msl_launch_mindam(&msl_list, newx, newy,
559 shp_hardtarget(&mvs->ship),
560 EF_SHIP, 1, what, victim, MI_INTERDICT);
563 "missile interdiction mission does %d damage to %s!\n",
565 shp_damage_one(mvs, dam);
568 } else if (++twotries >= 2) {
572 qp = msl_list.q_forw;
573 while (qp != msl_list.q_forw) {
583 /* Note that this function has a side effect - it uses coastwatch
584 * ranges to see if it should fire upon a ship. So, this function
585 * is expected to return positive if a ship is in range, and 0 if a
586 * ship is not in range. */
588 notify_coastguard(struct emp_qelem *list, int trange, struct sctstr *sectp)
590 struct emp_qelem *qp;
591 struct emp_qelem *next;
596 natp = getnatp(sectp->sct_own);
598 vrange = sectp->sct_type == SCT_RADAR ? 14 : 4;
599 vrange *= tfact(sectp->sct_own, 1.0) * sectp->sct_effic / 100.0;
607 /* We got here, so we could theoretically see the ship. Now,
608 * do we want to see it in our telebox? If not, return positive
609 * since we could see the ship and want forts to fire. */
610 if (!(natp->nat_flags & NF_COASTWATCH))
613 for (qp = list->q_back; qp != list; qp = next) {
615 mlp = (struct mlist *)qp;
616 if (mlp->mcp->m_flags & M_SUB)
618 wu(0, sectp->sct_own,
619 "%s %s sighted at %s\n",
620 cname(mlp->ship.shp_own),
622 xyas(mlp->ship.shp_x, mlp->ship.shp_y, sectp->sct_own));
624 setcont(sectp->sct_own, mlp->ship.shp_own, FOUND_LOOK);
632 shp_fort_interdiction(struct emp_qelem *list, coord newx, coord newy,
635 extern int fort_max_interdiction_range;
639 double range, range2, guneff;
643 s_char notified[MAXNOC];
646 /* Inform neutral and worse */
647 for (i = 0; i < MAXNOC; ++i) {
648 if (getrel(getnatp(i), victim) <= NEUTRAL)
654 snxtsct_dist(&ns, newx, newy, fort_max_interdiction_range);
655 while (nxtsct(&ns, &fsect)) {
658 if (fsect.sct_own == victim)
660 if (notified[fsect.sct_own])
662 trange = mapdist(newx, newy, fsect.sct_x, fsect.sct_y);
663 if (notify_coastguard(list, trange, &fsect))
664 notified[fsect.sct_own] = 1;
666 if (opt_NO_FORT_FIRE)
667 return 0; /* Only coastwatch notify in nofortfire */
668 /* Only fire at Hostile ships */
669 for (i = 0; i < MAXNOC; ++i) {
670 if (getrel(getnatp(i), victim) >= NEUTRAL)
673 snxtsct_dist(&ns, newx, newy, fort_max_interdiction_range);
674 while (nxtsct(&ns, &fsect)) {
675 if (!notified[fsect.sct_own])
677 if (fsect.sct_type != SCT_FORTR)
679 gun = getvar(V_GUN, (s_char *)&fsect, EF_SECTOR);
682 range = tfactfire(fsect.sct_own, (double)min(gun, 7));
683 if (fsect.sct_effic > 59)
685 range2 = roundrange(range);
686 trange = mapdist(newx, newy, fsect.sct_x, fsect.sct_y);
689 if (getvar(V_MILIT, (s_char *)&fsect, EF_SECTOR) < 5)
691 shell = getvar(V_SHELL, (s_char *)&fsect, EF_SECTOR);
693 shell += supply_commod(fsect.sct_own,
694 fsect.sct_x, fsect.sct_y, I_SHELL, 1);
698 putvar(V_SHELL, shell, (s_char *)&fsect, EF_SECTOR);
702 guneff = landgun((int)fsect.sct_effic, gun);
705 mpr(victim, "Incoming fire does %d damage!\n", dam);
707 mpr(victim, "%s fires at you for %d!\n",
708 xyas(fsect.sct_x,fsect.sct_y,victim),
712 "%s fires at %s ships in %s for %d!\n",
713 xyas(fsect.sct_x, fsect.sct_y,
715 cname(victim), xyas(newx, newy, fsect.sct_own), dam);
716 nreport(fsect.sct_own, N_SHP_SHELL, victim, 1);
719 return shp_damage(list, totdam, 0, M_SUB, newx, newy);
724 shp_interdict(struct emp_qelem *list, coord newx, coord newy, natid victim)
728 if (shp_contains(list, newx, newy, 0, M_SUB)) {
729 stopping |= shp_fort_interdiction(list, newx, newy, victim);
731 if (shp_contains(list, newx, newy, 0, M_SUB)) {
734 unit_interdict(newx, newy, victim, "ships",
735 shp_easiest_target(list, 0,
737 MI_INTERDICT), 0, M_SUB, newx,
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),
750 MI_SINTERDICT), M_SUB, 0, newx,
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)(((double)sp->shp_effic / 100.0) *
770 (20 + (double)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);
783 m = 22.0 + (double)(random() % 21);
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 mlist *)qp;
803 getsect(mlp->ship.shp_x, mlp->ship.shp_y, §);
804 if (mlp->mcp->m_flags & M_FOOD)
805 mpr(mlp->ship.shp_own, "[fert:%d] ", sect.sct_fertil);
806 if (mlp->mcp->m_flags & M_OIL)
807 mpr(mlp->ship.shp_own, "[oil:%d] ", sect.sct_oil);
808 mpr(mlp->ship.shp_own, "%s @ %s %d%% %s\n",
810 xyas(mlp->ship.shp_x, mlp->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;
822 struct emp_qelem *nqp;
823 struct emp_qelem *nnext;
831 double tech; /* for mapping */
832 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 mlist *)qp;
844 newx = xnorm(mlp->ship.shp_x + dx);
845 newy = ynorm(mlp->ship.shp_y + dy);
846 getsect(newx, newy, §);
847 if (shp_check_nav(§) != CN_NAVIGABLE ||
848 (sect.sct_own && actor != sect.sct_own &&
849 getrel(getnatp(sect.sct_own), actor) < FRIENDLY)) {
851 mpr(actor, "can't go to %s\n", xyas(newx, newy, actor));
854 sprintf(dp, "can't go to %s", xyas(newx, newy, actor));
859 if (opt_BIG_CITY && sect.sct_type == SCT_CAPIT) {
860 if (mlp->mcp->m_lcm + 2 * mlp->mcp->m_hcm >= 60) {
862 "is too large to fit into the canal system at %s",
863 xyas(newx, newy, actor));
868 if (mlp->mobil <= 0.0) {
869 shp_mess("is out of mobility", mlp);
872 mobcost = mlp->ship.shp_effic * 0.01 * mlp->ship.shp_speed;
874 (mobcost + techfact(mlp->ship.shp_tech, mobcost));
875 mlp->ship.shp_x = newx;
876 mlp->ship.shp_y = newy;
877 if (mlp->mobil - mobcost < -127) {
880 mlp->mobil -= mobcost;
882 mlp->ship.shp_mobil = (int)mlp->mobil;
883 putship(mlp->ship.shp_uid, &mlp->ship);
884 mlp->done = 0; /* We haven't interdicted this ship yet */
886 /* Now update the map for this ship */
887 tech = techfact(mlp->ship.shp_tech, (double)mlp->mcp->m_vrnge);
888 if (mlp->mcp->m_flags & M_SONAR)
889 tf = techfact(mlp->ship.shp_tech, 1.0);
892 radmapupd(mlp->ship.shp_own, mlp->ship.shp_x, mlp->ship.shp_y,
893 (int)mlp->ship.shp_effic, (int)tech, tf);
897 stopping |= shp_sweep(list, 0, actor);
900 stopping |= shp_check_mines(list);
904 /* Ok, run through each ship and interdict each coordinate */
905 for (qp = list->q_back; qp != list; qp = next) {
907 mlp = (struct mlist *)qp;
908 /* Has this ship been interdicted yet? */
911 newx = mlp->ship.shp_x;
912 newy = mlp->ship.shp_y;
913 stopping |= shp_interdict(list, newx, newy, actor);
916 /* Now, set all ships in this coordinate to done */
917 for (nqp = list->q_back; nqp != list; nqp = nnext) {
919 mlp = (struct mlist *)nqp;
920 if (mlp->ship.shp_x == newx && mlp->ship.shp_y == newy)
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, (caddr_t)&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 if (getvec(VT_ITEM, vec, (caddr_t)&ship, EF_SHIP) < 0)
963 if (vec[I_MILIT] < 1) /* do we have mil? */
965 if (vec[I_SHELL] < 2) { /* do we need shells */
966 if (vec[I_SHELL] += supply_commod(ship.shp_own,
968 ship.shp_y, I_SHELL, 2) < 2)
971 if (vec[I_GUN] < 1) /* we need at least 1 gun */
974 /* now calculate the odds */
975 gun = ((double)min(vec[I_GUN], ship.shp_glim));
976 eff = (double)ship.shp_effic / 100.0;
978 (((double)ship.shp_tech) / (((double)ship.shp_tech) + 200.0));
979 /* raise 4.5 for better interception -KHS */
980 hitchance = (int)(gun * eff * teff * 4.5) - hardtarget;
986 mpr(bombown, "%s anti-missile system activated...",
987 cname(ship.shp_own));
988 mpr(ship.shp_own, "Ship #%i anti-missile system activated!\n",
990 mpr(ship.shp_own, "%d%% hitchance...", hitchance);
992 putvar(V_SHELL, vec[I_SHELL] - 2, (caddr_t)&ship, EF_SHIP);
993 putship(ship.shp_uid, &ship);
995 if (roll(100) <= hitchance) {
996 mpr(bombown, "KABOOOM!! Missile destroyed\n\n");
998 "KABOOOM!! Incoming missile destroyed!\n\n");
1001 mpr(bombown, "SWOOSH!! anti-missile system failed!!\n");
1003 "SWOOSH!! Missile evades anti-missile systems\n\n");
1006 return 0; /* all attempts failed */
1010 shp_path(int together, struct shpstr *shp, s_char *buf)
1014 struct sctstr d_sect;
1017 if (!sarg_xy(buf, &destx, &desty))
1021 "Cannot go to a destination sector if not all starting in the same sector\n");
1024 if (!getsect(destx, desty, &d_sect)) {
1025 mpr(shp->shp_own, "%d,%d is not a sector\n", destx, desty);
1029 cp = (s_char *)BestShipPath(buf, shp->shp_x, shp->shp_y,
1030 d_sect.sct_x, d_sect.sct_y, player->cnum);
1031 if (!cp || shp->shp_mobil <= 0) {
1032 mpr(shp->shp_own, "Can't get to '%s' right now.\n",
1033 xyas(d_sect.sct_x, d_sect.sct_y, player->cnum));
1039 /* Fire missiles at a ship which has fired shells */
1041 shp_missdef(struct shpstr *sp, natid victim)
1043 struct emp_qelem list;
1050 mlp = (struct mlist *)malloc(sizeof(struct mlist));
1051 mlp->mcp = &mchr[(int)sp->shp_type];
1053 mlp->mobil = (double)sp->shp_mobil;
1054 emp_insque(&mlp->queue, &list);
1055 sprintf(buf, "%s", prship(&mlp->ship));
1057 eff = sp->shp_effic;
1058 if (most_valuable_ship(&list)) {
1059 shp_missile_interdiction(&list, sp->shp_x, sp->shp_y, sp->shp_own);
1060 getship(sp->shp_uid, sp);
1064 "missiles launched in defense did 100%% damage to %s\n",
1066 wu(0, victim, "%s sunk!\n", buf);
1067 } else if (eff > 0 && sp->shp_effic < eff) {
1069 "missiles launched in defense did %d%% damage to %s\n",
1070 100 * (eff - sp->shp_effic) / eff, buf);