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 bzero(ship.shp_rpath, RET_LEN);
108 putship(ship.shp_uid, &ship);
109 mlp = (struct mlist *)malloc(sizeof(struct mlist));
111 bcopy((s_char *)&ship, (s_char *)&mlp->ship,
112 sizeof(struct shpstr));
113 mlp->mobil = (double)ship.shp_mobil;
114 emp_insque(&mlp->queue, list);
118 /* This function assumes that the list was created by shp_sel */
120 shp_nav(struct emp_qelem *list, double *minmobp, double *maxmobp,
121 int *togetherp, natid actor)
123 extern int update_pending;
124 struct emp_qelem *qp;
125 struct emp_qelem *next;
137 for (qp = list->q_back; qp != list; qp = next) {
139 mlp = (struct mlist *)qp;
140 getship(mlp->ship.shp_uid, &ship);
141 if (ship.shp_own != actor) {
142 mpr(actor, "%s was sunk at %s\n",
143 prship(&ship), xyas(ship.shp_x, ship.shp_y, actor));
144 emp_remque((struct emp_qelem *)mlp);
149 if (*ship.shp_path && !update_pending) {
150 shp_mess("has a sail path", mlp);
151 mpr(actor, "Use `sail <#> -' to reset\n");
155 /* check crew - uws don't count */
156 getvec(VT_ITEM, vec, (s_char *)&ship, EF_SHIP);
157 if (vec[I_MILIT] == 0 && vec[I_CIVIL] == 0) {
158 shp_mess("is crewless", mlp);
161 if (!getsect(ship.shp_x, ship.shp_y, §)) {
162 shp_mess("was sucked into the sky by a strange looking spaceship", mlp); /* heh -KHS */
165 switch (shp_check_nav(§)) {
166 case CN_CONSTRUCTION:
167 shp_mess("is caught in a construction zone", mlp);
170 shp_mess("is landlocked", mlp);
176 shp_mess("was just swallowed by a big green worm", mlp);
184 if (ship.shp_x != allx || ship.shp_y != ally)
186 if (ship.shp_mobil + 1 < (int)mlp->mobil) {
187 mlp->mobil = (double)ship.shp_mobil;
189 if (mlp->mobil < *minmobp)
190 *minmobp = mlp->mobil;
191 if (mlp->mobil > *maxmobp)
192 *maxmobp = mlp->mobil;
193 bcopy((s_char *)&ship, (s_char *)&mlp->ship,
194 sizeof(struct shpstr));
199 shp_put(struct emp_qelem *list, natid actor)
201 register struct emp_qelem *qp;
202 register struct emp_qelem *newqp;
207 mlp = (struct mlist *)qp;
208 mpr(actor, "%s stopped at %s\n", prship(&mlp->ship),
209 xyas(mlp->ship.shp_x, mlp->ship.shp_y, mlp->ship.shp_own));
210 mlp->ship.shp_mobil = (int)mlp->mobil;
211 putship(mlp->ship.shp_uid, &mlp->ship);
220 shp_sweep(struct emp_qelem *ship_list, int verbose, natid actor)
222 struct emp_qelem *qp;
223 struct emp_qelem *next;
226 int mines, m, max, shells;
231 for (qp = ship_list->q_back; qp != ship_list; qp = next) {
233 mlp = (struct mlist *)qp;
234 if (!(mlp->mcp->m_flags & M_SWEEP)) {
236 mpr(actor, "%s doesn't have minesweeping capability!\n",
240 if (mlp->mobil <= 0.0) {
242 mpr(actor, "%s is out of mobility!\n", prship(&mlp->ship));
245 getsect(mlp->ship.shp_x, mlp->ship.shp_y, §);
246 if (sect.sct_type != SCT_WATER) {
248 mpr(actor, "%s is not at sea. No mines there!\n",
252 mobcost = mlp->ship.shp_effic * 0.01 * mlp->ship.shp_speed;
253 mobcost = 480.0 / (mobcost +
254 techfact(mlp->ship.shp_tech, mobcost));
255 mlp->mobil -= mobcost;
256 mlp->ship.shp_mobil = (int)mlp->mobil;
257 putship(mlp->ship.shp_uid, &mlp->ship);
258 if (!(mines = getvar(V_MINE, (s_char *)§, EF_SECTOR)))
260 max = vl_find(V_SHELL, mlp->mcp->m_vtype,
261 mlp->mcp->m_vamt, (int)mlp->mcp->m_nv);
262 shells = getvar(V_SHELL, (s_char *)&mlp->ship, EF_SHIP);
263 for (m = 0; mines > 0 && m < 5; m++) {
265 mpr(actor, "Sweep...\n");
267 shells = min(max, shells + 1);
268 changed |= map_set(actor, sect.sct_x, sect.sct_y, 'X', 0);
271 putvar(V_MINE, mines, (s_char *)§, EF_SECTOR);
272 putvar(V_SHELL, shells, (s_char *)&mlp->ship, EF_SHIP);
273 if (shp_check_one_mines(mlp)) {
278 putship(mlp->ship.shp_uid, &mlp->ship);
287 shp_check_one_mines(struct mlist *mlp)
294 getsect(mlp->ship.shp_x, mlp->ship.shp_y, §);
295 if (sect.sct_type != SCT_WATER)
297 if (!(mines = getvar(V_MINE, (s_char *)§, EF_SECTOR)))
299 if (chance(DMINE_HITCHANCE(mines))) {
300 actor = mlp->ship.shp_own;
301 shp_hit_mine(&mlp->ship, mlp->mcp);
303 changed |= map_set(actor, sect.sct_x, sect.sct_y, 'X', 0);
306 putvar(V_MINE, mines, (s_char *)§, EF_SECTOR);
308 putship(mlp->ship.shp_uid, (s_char *)&mlp->ship);
309 if (!mlp->ship.shp_own)
316 shp_check_mines(struct emp_qelem *ship_list)
318 struct emp_qelem *qp;
319 struct emp_qelem *next;
323 for (qp = ship_list->q_back; qp != ship_list; qp = next) {
325 mlp = (struct mlist *)qp;
326 if (shp_check_one_mines(mlp)) {
336 shp_list(struct emp_qelem *ship_list)
338 struct emp_qelem *qp;
339 struct emp_qelem *next;
344 pr("shp# ship type x,y fl eff mil sh gun pn he xl ln mob tech\n");
346 for (qp = ship_list->q_back; qp != ship_list; qp = next) {
348 mlp = (struct mlist *)qp;
350 pr("%4d ", shp->shp_uid);
351 pr("%-16.16s ", mlp->mcp->m_name);
352 prxy("%4d,%-4d ", shp->shp_x, shp->shp_y, mlp->ship.shp_own);
353 pr("%1c", shp->shp_fleet);
354 pr("%4d%%", shp->shp_effic);
355 getvec(VT_ITEM, vec, (s_char *)shp, EF_SHIP);
356 pr("%4d", vec[I_MILIT]);
357 pr("%4d", vec[I_SHELL]);
358 pr("%4d", vec[I_GUN]);
360 pr("%3d", shp->shp_nplane);
361 pr("%3d", shp->shp_nchoppers);
362 pr("%3d", shp->shp_nxlight);
364 pr("%3d", shp->shp_nland);
365 pr("%4d", shp->shp_mobil);
366 pr("%4d\n", shp->shp_tech);
371 shp_mess(s_char *str, struct mlist *mlp)
373 mpr(mlp->ship.shp_own, "%s %s & stays in %s\n",
375 str, xyas(mlp->ship.shp_x, mlp->ship.shp_y, mlp->ship.shp_own));
376 mlp->ship.shp_mobil = (int)mlp->mobil;
377 putship(mlp->ship.shp_uid, &mlp->ship);
378 emp_remque((struct emp_qelem *)mlp);
383 shp_check_nav(struct sctstr *sect)
385 extern struct dchrstr dchr[];
387 switch (dchr[sect->sct_type].d_flg & 03) {
392 if (sect->sct_effic < 2)
393 return CN_CONSTRUCTION;
396 if (sect->sct_effic < 60)
397 return CN_CONSTRUCTION;
400 return CN_LANDLOCKED;
406 shp_count(struct emp_qelem *list, int wantflags, int nowantflags, int x,
409 struct emp_qelem *qp;
410 struct emp_qelem *next;
414 for (qp = list->q_back; qp != list; qp = next) {
416 mlp = (struct mlist *)qp;
417 if (mlp->ship.shp_x != x || mlp->ship.shp_y != y)
419 if (wantflags && (mlp->mcp->m_flags & wantflags) != wantflags)
421 if (nowantflags && mlp->mcp->m_flags & nowantflags)
429 shp_damage_one(struct mlist *mlp, int dam)
431 shipdamage(&mlp->ship, dam);
432 putship(mlp->ship.shp_uid, &mlp->ship);
433 if (!mlp->ship.shp_own) {
434 emp_remque((struct emp_qelem *)mlp);
440 shp_damage(struct emp_qelem *list, int totdam, int wantflags,
441 int nowantflags, int x, int y)
443 struct emp_qelem *qp;
444 struct emp_qelem *next;
450 || !(count = shp_count(list, wantflags, nowantflags, x, y)))
452 dam = ldround(((double)totdam / (double)count), 1);
453 for (qp = list->q_back; qp != list; qp = next) {
455 mlp = (struct mlist *)qp;
456 if (mlp->ship.shp_x != x || mlp->ship.shp_y != y)
458 if (wantflags && (mlp->mcp->m_flags & wantflags) != wantflags)
460 if (nowantflags && mlp->mcp->m_flags & nowantflags)
462 shp_damage_one(mlp, dam);
468 shp_contains(struct emp_qelem *list, int newx, int newy, int wantflags,
471 struct emp_qelem *qp;
472 struct emp_qelem *next;
475 for (qp = list->q_back; qp != list; qp = next) {
477 mlp = (struct mlist *)qp;
478 /* If the ship isn't in the requested sector, then continue */
479 if (newx != mlp->ship.shp_x || newy != mlp->ship.shp_y)
481 if (wantflags && (mlp->mcp->m_flags & wantflags) != wantflags)
483 if (nowantflags && mlp->mcp->m_flags & nowantflags)
490 static struct mlist *
491 most_valuable_ship(struct emp_qelem *list)
493 struct emp_qelem *qp;
494 struct emp_qelem *next;
496 struct mlist *mvs = 0;
498 for (qp = list->q_back; qp != list; qp = next) {
500 mlp = (struct mlist *)qp;
501 if (mlp->mcp->m_flags & M_SUB)
503 if (!mlp->mcp->m_nxlight &&
504 !mlp->mcp->m_nchoppers &&
505 mlp->mcp->m_cost < 1000 &&
506 !mlp->mcp->m_nplanes && !mlp->mcp->m_nland)
512 if (mlp->mcp->m_cost * mlp->ship.shp_effic >
513 mvs->mcp->m_cost * mvs->ship.shp_effic)
520 shp_easiest_target(struct emp_qelem *list, int wantflags, int nowantflags)
522 struct emp_qelem *qp;
523 struct emp_qelem *next;
526 int easiest = 9876; /* things start great for victim */
529 for (qp = list->q_back; qp != list; qp = next) {
531 mlp = (struct mlist *)qp;
532 if (wantflags && (mlp->mcp->m_flags & wantflags) != wantflags)
534 if (nowantflags && mlp->mcp->m_flags & nowantflags)
536 hard = shp_hardtarget(&mlp->ship);
538 easiest = hard; /* things get worse for victim */
541 return easiest - count;
545 shp_missile_interdiction(struct emp_qelem *list, coord newx, coord newy,
551 struct emp_qelem msl_list, *qp, *newqp;
555 msl_sel(&msl_list, newx, newy, victim, P_T | P_MAR, 0, MI_INTERDICT);
558 while (!QEMPTY(&msl_list) && (mvs = most_valuable_ship(list))) {
559 sprintf(what, "%s", prship(&mvs->ship));
560 dam = msl_launch_mindam(&msl_list, newx, newy,
561 shp_hardtarget(&mvs->ship),
562 EF_SHIP, 1, what, victim, MI_INTERDICT);
565 "missile interdiction mission does %d damage to %s!\n",
567 shp_damage_one(mvs, dam);
570 } else if (++twotries >= 2) {
574 qp = msl_list.q_forw;
575 while (qp != msl_list.q_forw) {
585 /* Note that this function has a side effect - it uses coastwatch
586 * ranges to see if it should fire upon a ship. So, this function
587 * is expected to return positive if a ship is in range, and 0 if a
588 * ship is not in range. */
590 notify_coastguard(struct emp_qelem *list, int trange, struct sctstr *sectp)
592 struct emp_qelem *qp;
593 struct emp_qelem *next;
598 natp = getnatp(sectp->sct_own);
600 vrange = sectp->sct_type == SCT_RADAR ? 14 : 4;
601 vrange *= tfact(sectp->sct_own, 1.0) * sectp->sct_effic / 100.0;
609 /* We got here, so we could theoretically see the ship. Now,
610 * do we want to see it in our telebox? If not, return positive
611 * since we could see the ship and want forts to fire. */
612 if (!(natp->nat_flags & NF_COASTWATCH))
615 for (qp = list->q_back; qp != list; qp = next) {
617 mlp = (struct mlist *)qp;
618 if (mlp->mcp->m_flags & M_SUB)
620 wu(0, sectp->sct_own,
621 "%s %s sighted at %s\n",
622 cname(mlp->ship.shp_own),
624 xyas(mlp->ship.shp_x, mlp->ship.shp_y, sectp->sct_own));
626 setcont(sectp->sct_own, mlp->ship.shp_own, FOUND_LOOK);
634 shp_fort_interdiction(struct emp_qelem *list, coord newx, coord newy,
637 extern int fort_max_interdiction_range;
641 double range, range2, guneff;
645 s_char notified[MAXNOC];
648 /* Inform neutral and worse */
649 for (i = 0; i < MAXNOC; ++i) {
650 if (getrel(getnatp(i), victim) <= NEUTRAL)
656 snxtsct_dist(&ns, newx, newy, fort_max_interdiction_range);
657 while (nxtsct(&ns, &fsect)) {
660 if (fsect.sct_own == victim)
662 if (notified[fsect.sct_own])
664 trange = mapdist(newx, newy, fsect.sct_x, fsect.sct_y);
665 if (notify_coastguard(list, trange, &fsect))
666 notified[fsect.sct_own] = 1;
668 if (opt_NO_FORT_FIRE)
669 return 0; /* Only coastwatch notify in nofortfire */
670 /* Only fire at Hostile ships */
671 for (i = 0; i < MAXNOC; ++i) {
672 if (getrel(getnatp(i), victim) >= NEUTRAL)
675 snxtsct_dist(&ns, newx, newy, fort_max_interdiction_range);
676 while (nxtsct(&ns, &fsect)) {
677 if (!notified[fsect.sct_own])
679 if (fsect.sct_type != SCT_FORTR)
681 gun = getvar(V_GUN, (s_char *)&fsect, EF_SECTOR);
684 range = tfactfire(fsect.sct_own, (double)min(gun, 7));
685 if (fsect.sct_effic > 59)
687 range2 = roundrange(range);
688 trange = mapdist(newx, newy, fsect.sct_x, fsect.sct_y);
691 if (getvar(V_MILIT, (s_char *)&fsect, EF_SECTOR) < 5)
693 shell = getvar(V_SHELL, (s_char *)&fsect, EF_SECTOR);
695 shell += supply_commod(fsect.sct_own,
696 fsect.sct_x, fsect.sct_y, I_SHELL, 1);
700 putvar(V_SHELL, shell, (s_char *)&fsect, EF_SECTOR);
704 guneff = landgun((int)fsect.sct_effic, gun);
707 mpr(victim, "Incoming fire does %d damage!\n", dam);
709 mpr(victim, "%s fires at you for %d!\n",
710 xyas(fsect.sct_x,fsect.sct_y,victim),
714 "%s fires at %s ships in %s for %d!\n",
715 xyas(fsect.sct_x, fsect.sct_y,
717 cname(victim), xyas(newx, newy, fsect.sct_own), dam);
718 nreport(fsect.sct_own, N_SHP_SHELL, victim, 1);
721 return shp_damage(list, totdam, 0, M_SUB, newx, newy);
726 shp_interdict(struct emp_qelem *list, coord newx, coord newy, natid victim)
730 if (shp_contains(list, newx, newy, 0, M_SUB)) {
731 stopping |= shp_fort_interdiction(list, newx, newy, victim);
733 if (shp_contains(list, newx, newy, 0, M_SUB)) {
736 unit_interdict(newx, newy, victim, "ships",
737 shp_easiest_target(list, 0,
739 MI_INTERDICT), 0, M_SUB, newx,
741 if (most_valuable_ship(list)) {
743 shp_missile_interdiction(list, newx, newy, victim);
747 if (shp_contains(list, newx, newy, M_SUB, 0)) {
750 unit_interdict(newx, newy, victim, "subs",
751 shp_easiest_target(list, M_SUB, 0),
752 MI_SINTERDICT), M_SUB, 0, newx,
758 /* high value of hardtarget is harder to hit */
760 shp_hardtarget(struct shpstr *sp)
764 struct mchrstr *mcp = mchr + sp->shp_type;
767 getsect(sp->shp_x, sp->shp_y, §);
768 onsea = (sect.sct_type == SCT_WATER);
769 if (mcp->m_flags & M_SUB)
771 return (int)(((double)sp->shp_effic / 100.0) *
772 (20 + (double)sp->shp_speed * onsea / 2.0 - vis));
776 shp_hit_mine(struct shpstr *sp, struct mchrstr *mcp)
780 mpr(sp->shp_own, "Kawhomp! Mine detected in %s!\n",
781 xyas(sp->shp_x, sp->shp_y, sp->shp_own));
783 nreport(sp->shp_own, N_HIT_MINE, 0, 1);
785 m = 22.0 + (double)(random() % 21);
786 if (mcp->m_flags & M_SWEEP)
789 shipdamage(sp, ldround(m, 1));
795 shp_view(struct emp_qelem *list)
798 struct emp_qelem *qp;
799 struct emp_qelem *next;
802 for (qp = list->q_back; qp != list; qp = next) {
804 mlp = (struct mlist *)qp;
805 getsect(mlp->ship.shp_x, mlp->ship.shp_y, §);
806 if (mlp->mcp->m_flags & M_FOOD)
807 mpr(mlp->ship.shp_own, "[fert:%d] ", sect.sct_fertil);
808 if (mlp->mcp->m_flags & M_OIL)
809 mpr(mlp->ship.shp_own, "[oil:%d] ", sect.sct_oil);
810 mpr(mlp->ship.shp_own, "%s @ %s %d%% %s\n",
812 xyas(mlp->ship.shp_x, mlp->ship.shp_y, player->cnum),
813 sect.sct_effic, dchr[sect.sct_type].d_name);
818 shp_nav_one_sector(struct emp_qelem *list, int dir, natid actor,
822 struct emp_qelem *qp;
823 struct emp_qelem *next;
824 struct emp_qelem *nqp;
825 struct emp_qelem *nnext;
833 double tech; /* for mapping */
834 double tf; /* for mapping */
837 if (dir <= DIR_STOP || dir >= DIR_VIEW) {
838 shp_put(list, actor);
843 for (qp = list->q_back; qp != list; qp = next) {
845 mlp = (struct mlist *)qp;
846 newx = xnorm(mlp->ship.shp_x + dx);
847 newy = ynorm(mlp->ship.shp_y + dy);
848 getsect(newx, newy, §);
849 if (shp_check_nav(§) != CN_NAVIGABLE ||
850 (sect.sct_own && actor != sect.sct_own &&
851 getrel(getnatp(sect.sct_own), actor) < FRIENDLY)) {
853 mpr(actor, "can't go to %s\n", xyas(newx, newy, actor));
856 sprintf(dp, "can't go to %s", xyas(newx, newy, actor));
861 if (opt_BIG_CITY && sect.sct_type == SCT_CAPIT) {
862 if (mlp->mcp->m_lcm + 2 * mlp->mcp->m_hcm >= 60) {
864 "is too large to fit into the canal system at %s",
865 xyas(newx, newy, actor));
870 if (mlp->mobil <= 0.0) {
871 shp_mess("is out of mobility", mlp);
874 mobcost = mlp->ship.shp_effic * 0.01 * mlp->ship.shp_speed;
876 (mobcost + techfact(mlp->ship.shp_tech, mobcost));
877 mlp->ship.shp_x = newx;
878 mlp->ship.shp_y = newy;
879 if (mlp->mobil - mobcost < -127) {
882 mlp->mobil -= mobcost;
884 mlp->ship.shp_mobil = (int)mlp->mobil;
885 putship(mlp->ship.shp_uid, &mlp->ship);
886 mlp->done = 0; /* We haven't interdicted this ship yet */
888 /* Now update the map for this ship */
889 tech = techfact(mlp->ship.shp_tech, (double)mlp->mcp->m_vrnge);
890 if (mlp->mcp->m_flags & M_SONAR)
891 tf = techfact(mlp->ship.shp_tech, 1.0);
894 radmapupd(mlp->ship.shp_own, mlp->ship.shp_x, mlp->ship.shp_y,
895 (int)mlp->ship.shp_effic, (int)tech, tf);
899 stopping |= shp_sweep(list, 0, actor);
902 stopping |= shp_check_mines(list);
906 /* Ok, run through each ship and interdict each coordinate */
907 for (qp = list->q_back; qp != list; qp = next) {
909 mlp = (struct mlist *)qp;
910 /* Has this ship been interdicted yet? */
913 newx = mlp->ship.shp_x;
914 newy = mlp->ship.shp_y;
915 stopping |= shp_interdict(list, newx, newy, actor);
918 /* Now, set all ships in this coordinate to done */
919 for (nqp = list->q_back; nqp != list; nqp = nnext) {
921 mlp = (struct mlist *)nqp;
922 if (mlp->ship.shp_x == newx && mlp->ship.shp_y == newy)
932 * Check for incoming missiles with a P_MAR flag.
933 * Return True=1 if the missile was shotdown.
936 * Chad Zabel, July 95
940 shp_missile_defense(coord dx, coord dy, natid bombown, int hardtarget)
946 double gun, eff, teff;
948 snxtitem_dist(&ni, EF_SHIP, dx, dy, 1);
950 while (nxtitem(&ni, (caddr_t)&ship)) {
954 if (!(mchr[(int)ship.shp_type].m_flags & M_ANTIMISSILE))
957 if (getrel(getnatp(ship.shp_own), bombown) >= NEUTRAL)
960 if (ship.shp_effic < 60)
963 if (getvec(VT_ITEM, vec, (caddr_t)&ship, EF_SHIP) < 0)
965 if (vec[I_MILIT] < 1) /* do we have mil? */
967 if (vec[I_SHELL] < 2) { /* do we need shells */
968 if (vec[I_SHELL] += supply_commod(ship.shp_own,
970 ship.shp_y, I_SHELL, 2) < 2)
973 if (vec[I_GUN] < 1) /* we need at least 1 gun */
976 /* now calculate the odds */
977 gun = ((double)min(vec[I_GUN], ship.shp_glim));
978 eff = (double)ship.shp_effic / 100.0;
980 (((double)ship.shp_tech) / (((double)ship.shp_tech) + 200.0));
981 /* raise 4.5 for better interception -KHS */
982 hitchance = (int)(gun * eff * teff * 4.5) - hardtarget;
988 mpr(bombown, "%s anti-missile system activated...",
989 cname(ship.shp_own));
990 mpr(ship.shp_own, "Ship #%i anti-missile system activated!\n",
992 mpr(ship.shp_own, "%d%% hitchance...", hitchance);
994 putvar(V_SHELL, vec[I_SHELL] - 2, (caddr_t)&ship, EF_SHIP);
995 putship(ship.shp_uid, &ship);
997 if (roll(100) <= hitchance) {
998 mpr(bombown, "KABOOOM!! Missile destroyed\n\n");
1000 "KABOOOM!! Incoming missile destroyed!\n\n");
1003 mpr(bombown, "SWOOSH!! anti-missile system failed!!\n");
1005 "SWOOSH!! Missile evades anti-missile systems\n\n");
1008 return 0; /* all attempts failed */
1012 shp_path(int together, struct shpstr *shp, s_char *buf)
1016 struct sctstr d_sect;
1019 if (!sarg_xy(buf, &destx, &desty))
1023 "Cannot go to a destination sector if not all starting in the same sector\n");
1026 if (!getsect(destx, desty, &d_sect)) {
1027 mpr(shp->shp_own, "%d,%d is not a sector\n", destx, desty);
1031 cp = (s_char *)BestShipPath(buf, shp->shp_x, shp->shp_y,
1032 d_sect.sct_x, d_sect.sct_y, player->cnum);
1033 if (!cp || shp->shp_mobil <= 0) {
1034 mpr(shp->shp_own, "Can't get to '%s' right now.\n",
1035 xyas(d_sect.sct_x, d_sect.sct_y, player->cnum));
1041 /* Fire missiles at a ship which has fired shells */
1043 shp_missdef(struct shpstr *sp, natid victim)
1045 struct emp_qelem list;
1052 mlp = (struct mlist *)malloc(sizeof(struct mlist));
1053 mlp->mcp = &mchr[(int)sp->shp_type];
1054 bcopy((s_char *)sp, (s_char *)&mlp->ship, sizeof(struct shpstr));
1055 mlp->mobil = (double)sp->shp_mobil;
1056 emp_insque(&mlp->queue, &list);
1057 sprintf(buf, "%s", prship(&mlp->ship));
1059 eff = sp->shp_effic;
1060 if (most_valuable_ship(&list)) {
1061 shp_missile_interdiction(&list, sp->shp_x, sp->shp_y, sp->shp_own);
1062 getship(sp->shp_uid, sp);
1066 "missiles launched in defense did 100%% damage to %s\n",
1068 wu(0, victim, "%s sunk!\n", buf);
1069 } else if (eff > 0 && sp->shp_effic < eff) {
1071 "missiles launched in defense did %d%% damage to %s\n",
1072 100 * (eff - sp->shp_effic) / eff, buf);