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
54 #include "prototypes.h"
56 static int shp_check_nav(struct sctstr *);
57 static int shp_check_one_mines(struct mlist *);
58 static int shp_hit_mine(struct shpstr *, struct mchrstr *);
59 static void shp_mess(s_char *, struct mlist *);
62 shp_sel(struct nstr_item *ni, struct emp_qelem *list)
74 while (nxtitem(ni, (s_char *)&ship)) {
77 mcp = &mchr[(int)ship.shp_type];
78 /* if (wantflags && (mcp->m_flags & wantflags) != wantflags)
80 if (nowantflags && mcp->m_flags & nowantflags)
84 if (ontradingblock(EF_SHIP, (int *)&ship)) {
85 pr("ship #%d inelligible - it's for sale.\n",
90 /* This abuse is better fixed by building a ship with the normal negative
91 mobility that everything else is built with */
94 if (ship.shp_effic < 21 &&
95 ship.shp_mobil < etu_per_update) {
96 pr("%s needs at least %d mob to navigate.\n",
97 prship(&ship), etu_per_update);
102 ship.shp_mission = 0;
104 memset(ship.shp_rpath, 0, sizeof(ship.shp_rpath));
105 putship(ship.shp_uid, &ship);
106 mlp = (struct mlist *)malloc(sizeof(struct mlist));
109 mlp->mobil = (double)ship.shp_mobil;
110 emp_insque(&mlp->queue, list);
114 /* This function assumes that the list was created by shp_sel */
116 shp_nav(struct emp_qelem *list, double *minmobp, double *maxmobp,
117 int *togetherp, natid actor)
119 struct emp_qelem *qp;
120 struct emp_qelem *next;
132 for (qp = list->q_back; qp != list; qp = next) {
134 mlp = (struct mlist *)qp;
135 getship(mlp->ship.shp_uid, &ship);
136 if (ship.shp_own != actor) {
137 mpr(actor, "%s was sunk at %s\n",
138 prship(&ship), xyas(ship.shp_x, ship.shp_y, actor));
139 emp_remque((struct emp_qelem *)mlp);
144 if (*ship.shp_path && !update_pending) {
145 shp_mess("has a sail path", mlp);
146 mpr(actor, "Use `sail <#> -' to reset\n");
150 /* check crew - uws don't count */
151 getvec(VT_ITEM, vec, (s_char *)&ship, EF_SHIP);
152 if (vec[I_MILIT] == 0 && vec[I_CIVIL] == 0) {
153 shp_mess("is crewless", mlp);
156 if (!getsect(ship.shp_x, ship.shp_y, §)) {
157 shp_mess("was sucked into the sky by a strange looking spaceship", mlp); /* heh -KHS */
160 switch (shp_check_nav(§)) {
161 case CN_CONSTRUCTION:
162 shp_mess("is caught in a construction zone", mlp);
165 shp_mess("is landlocked", mlp);
171 shp_mess("was just swallowed by a big green worm", mlp);
179 if (ship.shp_x != allx || ship.shp_y != ally)
181 if (ship.shp_mobil + 1 < (int)mlp->mobil) {
182 mlp->mobil = (double)ship.shp_mobil;
184 if (mlp->mobil < *minmobp)
185 *minmobp = mlp->mobil;
186 if (mlp->mobil > *maxmobp)
187 *maxmobp = mlp->mobil;
193 shp_put(struct emp_qelem *list, natid actor)
195 register struct emp_qelem *qp;
196 register struct emp_qelem *newqp;
201 mlp = (struct mlist *)qp;
202 mpr(actor, "%s stopped at %s\n", prship(&mlp->ship),
203 xyas(mlp->ship.shp_x, mlp->ship.shp_y, mlp->ship.shp_own));
204 mlp->ship.shp_mobil = (int)mlp->mobil;
205 putship(mlp->ship.shp_uid, &mlp->ship);
214 shp_sweep(struct emp_qelem *ship_list, int verbose, natid actor)
216 struct emp_qelem *qp;
217 struct emp_qelem *next;
220 int mines, m, max, shells;
225 for (qp = ship_list->q_back; qp != ship_list; qp = next) {
227 mlp = (struct mlist *)qp;
228 if (!(mlp->mcp->m_flags & M_SWEEP)) {
230 mpr(actor, "%s doesn't have minesweeping capability!\n",
234 if (mlp->mobil <= 0.0) {
236 mpr(actor, "%s is out of mobility!\n", prship(&mlp->ship));
239 getsect(mlp->ship.shp_x, mlp->ship.shp_y, §);
240 if (sect.sct_type != SCT_WATER) {
242 mpr(actor, "%s is not at sea. No mines there!\n",
246 mobcost = mlp->ship.shp_effic * 0.01 * mlp->ship.shp_speed;
247 mobcost = 480.0 / (mobcost +
248 techfact(mlp->ship.shp_tech, mobcost));
249 mlp->mobil -= mobcost;
250 mlp->ship.shp_mobil = (int)mlp->mobil;
251 putship(mlp->ship.shp_uid, &mlp->ship);
252 if (!(mines = getvar(V_MINE, (s_char *)§, EF_SECTOR)))
254 max = vl_find(V_SHELL, mlp->mcp->m_vtype,
255 mlp->mcp->m_vamt, (int)mlp->mcp->m_nv);
256 shells = getvar(V_SHELL, (s_char *)&mlp->ship, EF_SHIP);
257 for (m = 0; mines > 0 && m < 5; m++) {
259 mpr(actor, "Sweep...\n");
261 shells = min(max, shells + 1);
262 changed |= map_set(actor, sect.sct_x, sect.sct_y, 'X', 0);
265 putvar(V_MINE, mines, (s_char *)§, EF_SECTOR);
266 putvar(V_SHELL, shells, (s_char *)&mlp->ship, EF_SHIP);
267 if (shp_check_one_mines(mlp)) {
272 putship(mlp->ship.shp_uid, &mlp->ship);
281 shp_check_one_mines(struct mlist *mlp)
288 getsect(mlp->ship.shp_x, mlp->ship.shp_y, §);
289 if (sect.sct_type != SCT_WATER)
291 if (!(mines = getvar(V_MINE, (s_char *)§, EF_SECTOR)))
293 if (chance(DMINE_HITCHANCE(mines))) {
294 actor = mlp->ship.shp_own;
295 shp_hit_mine(&mlp->ship, mlp->mcp);
297 changed |= map_set(actor, sect.sct_x, sect.sct_y, 'X', 0);
300 putvar(V_MINE, mines, (s_char *)§, EF_SECTOR);
302 putship(mlp->ship.shp_uid, (s_char *)&mlp->ship);
303 if (!mlp->ship.shp_own)
310 shp_check_mines(struct emp_qelem *ship_list)
312 struct emp_qelem *qp;
313 struct emp_qelem *next;
317 for (qp = ship_list->q_back; qp != ship_list; qp = next) {
319 mlp = (struct mlist *)qp;
320 if (shp_check_one_mines(mlp)) {
330 shp_list(struct emp_qelem *ship_list)
332 struct emp_qelem *qp;
333 struct emp_qelem *next;
338 pr("shp# ship type x,y fl eff mil sh gun pn he xl ln mob tech\n");
340 for (qp = ship_list->q_back; qp != ship_list; qp = next) {
342 mlp = (struct mlist *)qp;
344 pr("%4d ", shp->shp_uid);
345 pr("%-16.16s ", mlp->mcp->m_name);
346 prxy("%4d,%-4d ", shp->shp_x, shp->shp_y, mlp->ship.shp_own);
347 pr("%1c", shp->shp_fleet);
348 pr("%4d%%", shp->shp_effic);
349 getvec(VT_ITEM, vec, (s_char *)shp, EF_SHIP);
350 pr("%4d", vec[I_MILIT]);
351 pr("%4d", vec[I_SHELL]);
352 pr("%4d", vec[I_GUN]);
354 pr("%3d", shp->shp_nplane);
355 pr("%3d", shp->shp_nchoppers);
356 pr("%3d", shp->shp_nxlight);
358 pr("%3d", shp->shp_nland);
359 pr("%4d", shp->shp_mobil);
360 pr("%4d\n", shp->shp_tech);
365 shp_mess(s_char *str, struct mlist *mlp)
367 mpr(mlp->ship.shp_own, "%s %s & stays in %s\n",
369 str, xyas(mlp->ship.shp_x, mlp->ship.shp_y, mlp->ship.shp_own));
370 mlp->ship.shp_mobil = (int)mlp->mobil;
371 putship(mlp->ship.shp_uid, &mlp->ship);
372 emp_remque((struct emp_qelem *)mlp);
377 shp_check_nav(struct sctstr *sect)
379 switch (dchr[sect->sct_type].d_flg & 03) {
384 if (sect->sct_effic < 2)
385 return CN_CONSTRUCTION;
388 if (sect->sct_effic < 60)
389 return CN_CONSTRUCTION;
392 return CN_LANDLOCKED;
398 shp_count(struct emp_qelem *list, int wantflags, int nowantflags, int x,
401 struct emp_qelem *qp;
402 struct emp_qelem *next;
406 for (qp = list->q_back; qp != list; qp = next) {
408 mlp = (struct mlist *)qp;
409 if (mlp->ship.shp_x != x || mlp->ship.shp_y != y)
411 if (wantflags && (mlp->mcp->m_flags & wantflags) != wantflags)
413 if (nowantflags && mlp->mcp->m_flags & nowantflags)
421 shp_damage_one(struct mlist *mlp, int dam)
423 shipdamage(&mlp->ship, dam);
424 putship(mlp->ship.shp_uid, &mlp->ship);
425 if (!mlp->ship.shp_own) {
426 emp_remque((struct emp_qelem *)mlp);
432 shp_damage(struct emp_qelem *list, int totdam, int wantflags,
433 int nowantflags, int x, int y)
435 struct emp_qelem *qp;
436 struct emp_qelem *next;
442 || !(count = shp_count(list, wantflags, nowantflags, x, y)))
444 dam = ldround(((double)totdam / (double)count), 1);
445 for (qp = list->q_back; qp != list; qp = next) {
447 mlp = (struct mlist *)qp;
448 if (mlp->ship.shp_x != x || mlp->ship.shp_y != y)
450 if (wantflags && (mlp->mcp->m_flags & wantflags) != wantflags)
452 if (nowantflags && mlp->mcp->m_flags & nowantflags)
454 shp_damage_one(mlp, dam);
460 shp_contains(struct emp_qelem *list, int newx, int newy, int wantflags,
463 struct emp_qelem *qp;
464 struct emp_qelem *next;
467 for (qp = list->q_back; qp != list; qp = next) {
469 mlp = (struct mlist *)qp;
470 /* If the ship isn't in the requested sector, then continue */
471 if (newx != mlp->ship.shp_x || newy != mlp->ship.shp_y)
473 if (wantflags && (mlp->mcp->m_flags & wantflags) != wantflags)
475 if (nowantflags && mlp->mcp->m_flags & nowantflags)
482 static struct mlist *
483 most_valuable_ship(struct emp_qelem *list)
485 struct emp_qelem *qp;
486 struct emp_qelem *next;
488 struct mlist *mvs = 0;
490 for (qp = list->q_back; qp != list; qp = next) {
492 mlp = (struct mlist *)qp;
493 if (mlp->mcp->m_flags & M_SUB)
495 if (!mlp->mcp->m_nxlight &&
496 !mlp->mcp->m_nchoppers &&
497 mlp->mcp->m_cost < 1000 &&
498 !mlp->mcp->m_nplanes && !mlp->mcp->m_nland)
504 if (mlp->mcp->m_cost * mlp->ship.shp_effic >
505 mvs->mcp->m_cost * mvs->ship.shp_effic)
512 shp_easiest_target(struct emp_qelem *list, int wantflags, int nowantflags)
514 struct emp_qelem *qp;
515 struct emp_qelem *next;
518 int easiest = 9876; /* things start great for victim */
521 for (qp = list->q_back; qp != list; qp = next) {
523 mlp = (struct mlist *)qp;
524 if (wantflags && (mlp->mcp->m_flags & wantflags) != wantflags)
526 if (nowantflags && mlp->mcp->m_flags & nowantflags)
528 hard = shp_hardtarget(&mlp->ship);
530 easiest = hard; /* things get worse for victim */
533 return easiest - count;
537 shp_missile_interdiction(struct emp_qelem *list, coord newx, coord newy,
543 struct emp_qelem msl_list, *qp, *newqp;
547 msl_sel(&msl_list, newx, newy, victim, P_T | P_MAR, 0, MI_INTERDICT);
550 while (!QEMPTY(&msl_list) && (mvs = most_valuable_ship(list))) {
551 sprintf(what, "%s", prship(&mvs->ship));
552 dam = msl_launch_mindam(&msl_list, newx, newy,
553 shp_hardtarget(&mvs->ship),
554 EF_SHIP, 1, what, victim, MI_INTERDICT);
557 "missile interdiction mission does %d damage to %s!\n",
559 shp_damage_one(mvs, dam);
562 } else if (++twotries >= 2) {
566 qp = msl_list.q_forw;
567 while (qp != msl_list.q_forw) {
577 /* Note that this function has a side effect - it uses coastwatch
578 * ranges to see if it should fire upon a ship. So, this function
579 * is expected to return positive if a ship is in range, and 0 if a
580 * ship is not in range. */
582 notify_coastguard(struct emp_qelem *list, int trange, struct sctstr *sectp)
584 struct emp_qelem *qp;
585 struct emp_qelem *next;
590 natp = getnatp(sectp->sct_own);
592 vrange = sectp->sct_type == SCT_RADAR ? 14 : 4;
593 vrange *= tfact(sectp->sct_own, 1.0) * sectp->sct_effic / 100.0;
601 /* We got here, so we could theoretically see the ship. Now,
602 * do we want to see it in our telebox? If not, return positive
603 * since we could see the ship and want forts to fire. */
604 if (!(natp->nat_flags & NF_COASTWATCH))
607 for (qp = list->q_back; qp != list; qp = next) {
609 mlp = (struct mlist *)qp;
610 if (mlp->mcp->m_flags & M_SUB)
612 wu(0, sectp->sct_own,
613 "%s %s sighted at %s\n",
614 cname(mlp->ship.shp_own),
616 xyas(mlp->ship.shp_x, mlp->ship.shp_y, sectp->sct_own));
618 setcont(sectp->sct_own, mlp->ship.shp_own, FOUND_LOOK);
626 shp_fort_interdiction(struct emp_qelem *list, coord newx, coord newy,
632 double range, range2, guneff;
636 s_char notified[MAXNOC];
639 /* Inform neutral and worse */
640 for (i = 0; i < MAXNOC; ++i) {
641 if (getrel(getnatp(i), victim) <= NEUTRAL)
647 snxtsct_dist(&ns, newx, newy, fort_max_interdiction_range);
648 while (nxtsct(&ns, &fsect)) {
651 if (fsect.sct_own == victim)
653 if (notified[fsect.sct_own])
655 trange = mapdist(newx, newy, fsect.sct_x, fsect.sct_y);
656 if (notify_coastguard(list, trange, &fsect))
657 notified[fsect.sct_own] = 1;
659 if (opt_NO_FORT_FIRE)
660 return 0; /* Only coastwatch notify in nofortfire */
661 /* Only fire at Hostile ships */
662 for (i = 0; i < MAXNOC; ++i) {
663 if (getrel(getnatp(i), victim) >= NEUTRAL)
666 snxtsct_dist(&ns, newx, newy, fort_max_interdiction_range);
667 while (nxtsct(&ns, &fsect)) {
668 if (!notified[fsect.sct_own])
670 if (fsect.sct_type != SCT_FORTR)
672 gun = getvar(V_GUN, (s_char *)&fsect, EF_SECTOR);
675 range = tfactfire(fsect.sct_own, (double)min(gun, 7));
676 if (fsect.sct_effic > 59)
678 range2 = roundrange(range);
679 trange = mapdist(newx, newy, fsect.sct_x, fsect.sct_y);
682 if (getvar(V_MILIT, (s_char *)&fsect, EF_SECTOR) < 5)
684 shell = getvar(V_SHELL, (s_char *)&fsect, EF_SECTOR);
686 shell += supply_commod(fsect.sct_own,
687 fsect.sct_x, fsect.sct_y, I_SHELL, 1);
691 putvar(V_SHELL, shell, (s_char *)&fsect, EF_SECTOR);
695 guneff = landgun((int)fsect.sct_effic, gun);
698 mpr(victim, "Incoming fire does %d damage!\n", dam);
700 mpr(victim, "%s fires at you for %d!\n",
701 xyas(fsect.sct_x,fsect.sct_y,victim),
705 "%s fires at %s ships in %s for %d!\n",
706 xyas(fsect.sct_x, fsect.sct_y,
708 cname(victim), xyas(newx, newy, fsect.sct_own), dam);
709 nreport(fsect.sct_own, N_SHP_SHELL, victim, 1);
712 return shp_damage(list, totdam, 0, M_SUB, newx, newy);
717 shp_interdict(struct emp_qelem *list, coord newx, coord newy, natid victim)
721 if (shp_contains(list, newx, newy, 0, M_SUB)) {
722 stopping |= shp_fort_interdiction(list, newx, newy, victim);
724 if (shp_contains(list, newx, newy, 0, M_SUB)) {
727 unit_interdict(newx, newy, victim, "ships",
728 shp_easiest_target(list, 0,
730 MI_INTERDICT), 0, M_SUB, newx,
732 if (most_valuable_ship(list)) {
734 shp_missile_interdiction(list, newx, newy, victim);
738 if (shp_contains(list, newx, newy, M_SUB, 0)) {
741 unit_interdict(newx, newy, victim, "subs",
742 shp_easiest_target(list, M_SUB, 0),
743 MI_SINTERDICT), M_SUB, 0, newx,
749 /* high value of hardtarget is harder to hit */
751 shp_hardtarget(struct shpstr *sp)
755 struct mchrstr *mcp = mchr + sp->shp_type;
758 getsect(sp->shp_x, sp->shp_y, §);
759 onsea = (sect.sct_type == SCT_WATER);
760 if (mcp->m_flags & M_SUB)
762 return (int)(((double)sp->shp_effic / 100.0) *
763 (20 + (double)sp->shp_speed * onsea / 2.0 - vis));
767 shp_hit_mine(struct shpstr *sp, struct mchrstr *mcp)
771 mpr(sp->shp_own, "Kawhomp! Mine detected in %s!\n",
772 xyas(sp->shp_x, sp->shp_y, sp->shp_own));
774 nreport(sp->shp_own, N_HIT_MINE, 0, 1);
776 m = 22.0 + (double)(random() % 21);
777 if (mcp->m_flags & M_SWEEP)
780 shipdamage(sp, ldround(m, 1));
786 shp_view(struct emp_qelem *list)
789 struct emp_qelem *qp;
790 struct emp_qelem *next;
793 for (qp = list->q_back; qp != list; qp = next) {
795 mlp = (struct mlist *)qp;
796 getsect(mlp->ship.shp_x, mlp->ship.shp_y, §);
797 if (mlp->mcp->m_flags & M_FOOD)
798 mpr(mlp->ship.shp_own, "[fert:%d] ", sect.sct_fertil);
799 if (mlp->mcp->m_flags & M_OIL)
800 mpr(mlp->ship.shp_own, "[oil:%d] ", sect.sct_oil);
801 mpr(mlp->ship.shp_own, "%s @ %s %d%% %s\n",
803 xyas(mlp->ship.shp_x, mlp->ship.shp_y, player->cnum),
804 sect.sct_effic, dchr[sect.sct_type].d_name);
809 shp_nav_one_sector(struct emp_qelem *list, int dir, natid actor,
813 struct emp_qelem *qp;
814 struct emp_qelem *next;
815 struct emp_qelem *nqp;
816 struct emp_qelem *nnext;
824 double tech; /* for mapping */
825 double tf; /* for mapping */
828 if (dir <= DIR_STOP || dir >= DIR_VIEW) {
829 shp_put(list, actor);
834 for (qp = list->q_back; qp != list; qp = next) {
836 mlp = (struct mlist *)qp;
837 newx = xnorm(mlp->ship.shp_x + dx);
838 newy = ynorm(mlp->ship.shp_y + dy);
839 getsect(newx, newy, §);
840 if (shp_check_nav(§) != CN_NAVIGABLE ||
841 (sect.sct_own && actor != sect.sct_own &&
842 getrel(getnatp(sect.sct_own), actor) < FRIENDLY)) {
844 mpr(actor, "can't go to %s\n", xyas(newx, newy, actor));
847 sprintf(dp, "can't go to %s", xyas(newx, newy, actor));
852 if (opt_BIG_CITY && sect.sct_type == SCT_CAPIT) {
853 if (mlp->mcp->m_lcm + 2 * mlp->mcp->m_hcm >= 60) {
855 "is too large to fit into the canal system at %s",
856 xyas(newx, newy, actor));
861 if (mlp->mobil <= 0.0) {
862 shp_mess("is out of mobility", mlp);
865 mobcost = mlp->ship.shp_effic * 0.01 * mlp->ship.shp_speed;
867 (mobcost + techfact(mlp->ship.shp_tech, mobcost));
868 mlp->ship.shp_x = newx;
869 mlp->ship.shp_y = newy;
870 if (mlp->mobil - mobcost < -127) {
873 mlp->mobil -= mobcost;
875 mlp->ship.shp_mobil = (int)mlp->mobil;
876 putship(mlp->ship.shp_uid, &mlp->ship);
877 mlp->done = 0; /* We haven't interdicted this ship yet */
879 /* Now update the map for this ship */
880 tech = techfact(mlp->ship.shp_tech, (double)mlp->mcp->m_vrnge);
881 if (mlp->mcp->m_flags & M_SONAR)
882 tf = techfact(mlp->ship.shp_tech, 1.0);
885 radmapupd(mlp->ship.shp_own, mlp->ship.shp_x, mlp->ship.shp_y,
886 (int)mlp->ship.shp_effic, (int)tech, tf);
890 stopping |= shp_sweep(list, 0, actor);
893 stopping |= shp_check_mines(list);
897 /* Ok, run through each ship and interdict each coordinate */
898 for (qp = list->q_back; qp != list; qp = next) {
900 mlp = (struct mlist *)qp;
901 /* Has this ship been interdicted yet? */
904 newx = mlp->ship.shp_x;
905 newy = mlp->ship.shp_y;
906 stopping |= shp_interdict(list, newx, newy, actor);
909 /* Now, set all ships in this coordinate to done */
910 for (nqp = list->q_back; nqp != list; nqp = nnext) {
912 mlp = (struct mlist *)nqp;
913 if (mlp->ship.shp_x == newx && mlp->ship.shp_y == newy)
923 * Check for incoming missiles with a P_MAR flag.
924 * Return True=1 if the missile was shotdown.
927 * Chad Zabel, July 95
931 shp_missile_defense(coord dx, coord dy, natid bombown, int hardtarget)
937 double gun, eff, teff;
939 snxtitem_dist(&ni, EF_SHIP, dx, dy, 1);
941 while (nxtitem(&ni, (caddr_t)&ship)) {
945 if (!(mchr[(int)ship.shp_type].m_flags & M_ANTIMISSILE))
948 if (getrel(getnatp(ship.shp_own), bombown) >= NEUTRAL)
951 if (ship.shp_effic < 60)
954 if (getvec(VT_ITEM, vec, (caddr_t)&ship, EF_SHIP) < 0)
956 if (vec[I_MILIT] < 1) /* do we have mil? */
958 if (vec[I_SHELL] < 2) { /* do we need shells */
959 vec[I_SHELL] += supply_commod(ship.shp_own,
960 ship.shp_x, ship.shp_y,
962 if (vec[I_SHELL] < 2)
965 if (vec[I_GUN] < 1) /* we need at least 1 gun */
968 /* now calculate the odds */
969 gun = ((double)min(vec[I_GUN], ship.shp_glim));
970 eff = (double)ship.shp_effic / 100.0;
972 (((double)ship.shp_tech) / (((double)ship.shp_tech) + 200.0));
973 /* raise 4.5 for better interception -KHS */
974 hitchance = (int)(gun * eff * teff * 4.5) - hardtarget;
980 mpr(bombown, "%s anti-missile system activated...",
981 cname(ship.shp_own));
982 mpr(ship.shp_own, "Ship #%i anti-missile system activated!\n",
984 mpr(ship.shp_own, "%d%% hitchance...", hitchance);
986 putvar(V_SHELL, vec[I_SHELL] - 2, (caddr_t)&ship, EF_SHIP);
987 putship(ship.shp_uid, &ship);
989 if (roll(100) <= hitchance) {
990 mpr(bombown, "KABOOOM!! Missile destroyed\n\n");
992 "KABOOOM!! Incoming missile destroyed!\n\n");
995 mpr(bombown, "SWOOSH!! anti-missile system failed!!\n");
997 "SWOOSH!! Missile evades anti-missile systems\n\n");
1000 return 0; /* all attempts failed */
1004 shp_path(int together, struct shpstr *shp, s_char *buf)
1008 struct sctstr d_sect;
1011 if (!sarg_xy(buf, &destx, &desty))
1015 "Cannot go to a destination sector if not all starting in the same sector\n");
1018 if (!getsect(destx, desty, &d_sect)) {
1019 mpr(shp->shp_own, "%d,%d is not a sector\n", destx, desty);
1023 cp = (s_char *)BestShipPath(buf, shp->shp_x, shp->shp_y,
1024 d_sect.sct_x, d_sect.sct_y, player->cnum);
1025 if (!cp || shp->shp_mobil <= 0) {
1026 mpr(shp->shp_own, "Can't get to '%s' right now.\n",
1027 xyas(d_sect.sct_x, d_sect.sct_y, player->cnum));
1033 /* Fire missiles at a ship which has fired shells */
1035 shp_missdef(struct shpstr *sp, natid victim)
1037 struct emp_qelem list;
1044 mlp = (struct mlist *)malloc(sizeof(struct mlist));
1045 mlp->mcp = &mchr[(int)sp->shp_type];
1047 mlp->mobil = (double)sp->shp_mobil;
1048 emp_insque(&mlp->queue, &list);
1049 sprintf(buf, "%s", prship(&mlp->ship));
1051 eff = sp->shp_effic;
1052 if (most_valuable_ship(&list)) {
1053 shp_missile_interdiction(&list, sp->shp_x, sp->shp_y, sp->shp_own);
1054 getship(sp->shp_uid, sp);
1058 "missiles launched in defense did 100%% damage to %s\n",
1060 wu(0, victim, "%s sunk!\n", buf);
1061 } else if (eff > 0 && sp->shp_effic < eff) {
1063 "missiles launched in defense did %d%% damage to %s\n",
1064 100 * (eff - sp->shp_effic) / eff, buf);