2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2008, 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 * lndsub.c: Land unit subroutines
30 * Known contributors to this file:
32 * Steve McClure, 1998-2000
33 * Markus Armbruster, 2004-2008
49 #include "prototypes.h"
54 static void lnd_mess(char *, struct ulist *);
55 static int lnd_hit_mine(struct lndstr *, struct lchrstr *);
56 static int has_helpful_engineer(coord, coord, natid);
59 attack_val(int combat_mode, struct lndstr *lp)
65 if (lp->lnd_effic < LAND_MINEFF) {
66 putland(lp->lnd_uid, lp);
70 lcp = &lchr[(int)lp->lnd_type];
72 /* Spies always count as 1 during assaults. If they are the only ones
73 in the assault, they get to sneak on anyway. */
75 if (lcp->l_flags & L_SPY && combat_mode == A_ASSAULT)
78 men = lp->lnd_item[I_MILIT];
79 value = men * lnd_att(lp) * lp->lnd_effic / 100.0;
81 switch (combat_mode) {
85 if (!(lcp->l_flags & L_MARINE))
86 return assault_penalty * value;
89 if (!(lcp->l_flags & L_MARINE))
90 return assault_penalty * men;
97 defense_val(struct lndstr *lp)
103 if (lp->lnd_effic < LAND_MINEFF) {
104 putland(lp->lnd_uid, lp);
108 lcp = &lchr[(int)lp->lnd_type];
110 men = lp->lnd_item[I_MILIT];
112 if ((lp->lnd_ship >= 0 || lp->lnd_land >= 0) &&
113 !(lcp->l_flags & L_MARINE))
116 value = men * lnd_def(lp) * lp->lnd_effic / 100.0;
117 value *= ((double)land_mob_max + lp->lnd_harden) / land_mob_max;
119 /* If there are military on the unit, you get at least a 1
120 man defensive unit, except for spies */
121 if (value < 1.0 && men > 0 && !(lcp->l_flags & L_SPY))
128 lnd_print(struct ulist *llp, char *s)
130 if (llp->unit.land.lnd_own == player->cnum)
131 pr("%s %s\n", prland(&llp->unit.land), s);
133 wu(0, llp->unit.land.lnd_own, "%s %s\n", prland(&llp->unit.land), s);
137 lnd_delete(struct ulist *llp, char *s)
141 putland(llp->unit.land.lnd_uid, &llp->unit.land);
142 emp_remque((struct emp_qelem *)llp);
147 lnd_take_casualty(int combat_mode, struct ulist *llp, int cas)
148 /* attacking or assaulting or paratrooping? */
149 /* number of casualties to take */
162 int nowhere_to_go = 0;
164 double mobcost, bmcost;
168 taken = llp->unit.land.lnd_item[I_MILIT];
169 /* Spies always die */
170 if (((struct lchrstr *)llp->chrp)->l_flags & L_SPY) {
172 llp->unit.land.lnd_effic = 0;
174 eff_eq = ldround(cas * 100.0 /
175 ((struct lchrstr *)llp->chrp)->l_item[I_MILIT], 1);
176 llp->unit.land.lnd_effic -= eff_eq;
177 lnd_submil(&llp->unit.land, cas);
180 if (llp->unit.land.lnd_effic < LAND_MINEFF) {
181 sprintf(buf, "dies %s %s!",
182 combat_mode ? att_mode[combat_mode] : "defending",
183 xyas(llp->unit.land.lnd_x, llp->unit.land.lnd_y,
184 llp->unit.land.lnd_own));
185 lnd_delete(llp, buf);
186 /* Since we killed the unit, we killed all the mil on it */
189 /* Ok, now, how many did we take off? (sould be the diff) */
190 taken = taken - llp->unit.land.lnd_item[I_MILIT];
193 if (llp->unit.land.lnd_effic >= llp->unit.land.lnd_retreat)
196 /* we're being boarded */
197 if (llp->unit.land.lnd_ship >= 0 && combat_mode == A_DEFEND)
200 /* we're being boarded */
201 if (llp->unit.land.lnd_land >= 0 && combat_mode == A_DEFEND)
204 /* Have to make a retreat check */
206 ret_chance = llp->unit.land.lnd_retreat - llp->unit.land.lnd_effic;
207 if (roll(100) < ret_chance) {
209 lnd_print(llp, "fails morale check!");
210 llp->unit.land.lnd_mission = 0;
211 llp->unit.land.lnd_harden = 0;
212 if (llp->unit.land.lnd_ship >= 0 || llp->unit.land.lnd_land >= 0)
214 else if (combat_mode == A_DEFEND) {
216 * defending unit.. find a place to send it
217 * strategy: look for the most-populated
218 * adjacent sector that is owned by the unit
219 * owner. Charge mob..
223 for (n = 1; n <= 6; ++n) {
224 ret_x = llp->unit.land.lnd_x + diroff[n][0];
225 ret_y = llp->unit.land.lnd_y + diroff[n][1];
226 getsect(ret_x, ret_y, §);
227 if (sect.sct_own != llp->unit.land.lnd_own)
229 if (sect.sct_type == SCT_MOUNT)
231 mobcost = lnd_mobcost(&llp->unit.land, &rsect);
235 civs = sect.sct_item[I_CIVIL];
236 if (civs > biggest) {
246 /* retreat to bx,by */
247 llp->unit.land.lnd_x = bx;
248 llp->unit.land.lnd_y = by;
249 /* FIXME landmines */
250 getsect(bx, by, &rsect);
251 mob = llp->unit.land.lnd_mobil - (int)bmcost;
254 orig = llp->unit.land.lnd_mobil;
255 llp->unit.land.lnd_mobil = (signed char)mob;
256 if (llp->unit.land.lnd_mobil > orig)
257 llp->unit.land.lnd_mobil = -127;
258 sprintf(buf, "retreats at %d%% efficiency to %s!",
259 llp->unit.land.lnd_effic,
260 xyas(bx, by, llp->unit.land.lnd_own));
261 lnd_delete(llp, buf);
263 } else { /* attacking from a sector */
264 sprintf(buf, "leaves the battlefield at %d%% efficiency",
265 llp->unit.land.lnd_effic);
266 if ((llp->unit.land.lnd_mobil - (int)llp->mobil) < -127)
267 llp->unit.land.lnd_mobil = -127;
269 llp->unit.land.lnd_mobil -= (int)llp->mobil;
271 lnd_delete(llp, buf);
275 /* nowhere to go.. take more casualties */
276 llp->unit.land.lnd_effic -= 10;
277 lnd_submil(&llp->unit.land,
278 ((struct lchrstr *)llp->chrp)->l_item[I_MILIT] / 10);
279 if (llp->unit.land.lnd_effic < LAND_MINEFF)
280 lnd_delete(llp, "has nowhere to retreat, and dies!");
283 "has nowhere to retreat and takes extra losses!");
290 lnd_takemob(struct emp_qelem *list, double loss)
292 struct emp_qelem *qp, *next;
295 int mcost = ldround(combat_mob * loss, 1);
297 for (qp = list->q_forw; qp != list; qp = next) {
299 llp = (struct ulist *)qp;
302 use_supply(&llp->unit.land);
303 if (llp->unit.land.lnd_mission == MI_RESERVE)
304 new = llp->unit.land.lnd_mobil - mcost/2;
307 new = llp->unit.land.lnd_mobil - mcost;
310 llp->unit.land.lnd_mobil = (signed char)new;
315 lnd_submil(struct lndstr *lp, int num)
317 int new = lp->lnd_item[I_MILIT] - num;
318 lp->lnd_item[I_MILIT] = new < 0 ? 0 : new;
322 lnd_spyval(struct lndstr *lp)
324 if (lchr[(int)lp->lnd_type].l_flags & L_RECON)
325 return lchr[lp->lnd_type].l_spy * (lp->lnd_effic / 100.0) + 2;
327 return lchr[lp->lnd_type].l_spy * (lp->lnd_effic / 100.0);
331 intelligence_report(int destination, struct lndstr *lp, int spy,
334 int vis = lnd_vis(lp);
335 char buf1[80], buf2[80], buf3[80];
337 if (destination == 0)
340 if (lp->lnd_own == 0)
343 memset(buf1, 0, sizeof(buf1));
344 memset(buf2, 0, sizeof(buf2));
345 memset(buf3, 0, sizeof(buf3));
346 if (chance((spy + vis) / 10.0)) {
347 if (destination == player->cnum)
348 pr("%s %s", mess, prland(lp));
350 sprintf(buf1, "%s %s", mess, prland(lp));
352 if (chance((spy + vis) / 20.0)) {
353 if (destination == player->cnum)
354 pr(" (eff %d, mil %d",
355 roundintby(lp->lnd_effic, 5),
356 roundintby(lp->lnd_item[I_MILIT], 10));
358 sprintf(buf2, " (eff %d, mil %d",
359 roundintby(lp->lnd_effic, 5),
360 roundintby(lp->lnd_item[I_MILIT], 10));
362 if (chance((spy + vis) / 20.0)) {
364 t = lp->lnd_tech - 20 + roll(40);
366 if (destination == player->cnum)
367 pr(", tech %d)\n", t);
369 sprintf(buf3, ", tech %d)\n", t);
371 if (destination == player->cnum)
374 sprintf(buf3, ")\n");
377 if (destination == player->cnum)
384 if (destination != player->cnum) {
385 wu(0, destination, "%s%s%s", buf1, buf2, buf3);
390 count_units(struct shpstr *sp)
396 if (sp->shp_effic < SHIP_MINEFF)
399 snxtitem_xy(&ni, EF_LAND, sp->shp_x, sp->shp_y);
400 while (nxtitem(&ni, &land)) {
401 if (land.lnd_own == 0)
403 if (land.lnd_ship == sp->shp_uid)
407 if (sp->shp_nland != nland) {
408 sp->shp_nland = nland;
409 putship(sp->shp_uid, sp);
414 lnd_count_units(struct lndstr *lp)
420 if (lp->lnd_effic < LAND_MINEFF)
423 snxtitem_xy(&ni, EF_LAND, lp->lnd_x, lp->lnd_y);
424 while (nxtitem(&ni, &land)) {
425 if (land.lnd_own == 0)
427 if (land.lnd_land == lp->lnd_uid)
431 if (lp->lnd_nland != nland) {
432 lp->lnd_nland = nland;
433 putland(lp->lnd_uid, lp);
438 lnd_sel(struct nstr_item *ni, struct emp_qelem *list)
444 int mobtype = MOB_MOVE; /* indeterminate */
447 while (nxtitem(ni, &land)) {
451 if (ontradingblock(EF_LAND, &land)) {
452 pr("unit #%d inelligible - it's for sale.\n",
458 * The marching code gets confused when trains and non-trains
459 * march together. Disallow for now.
461 this_mot = lnd_mobtype(&land);
462 if (this_mot != mobtype) {
463 if (mobtype == MOB_MOVE)
465 else if (mobtype == MOB_MARCH) {
466 pr("%s is a train and can't march with the leader.\n",
470 pr("%s can't rail-march with the leading train.\n",
476 lcp = &lchr[(int)land.lnd_type];
477 land.lnd_mission = 0;
480 memset(land.lnd_rpath, 0, sizeof(land.lnd_rpath));
481 putland(land.lnd_uid, &land);
482 llp = malloc(sizeof(struct ulist));
483 llp->chrp = (struct empobj_chr *)lcp;
484 llp->unit.land = land;
485 llp->mobil = land.lnd_mobil;
486 emp_insque(&llp->queue, list);
490 /* This function assumes that the list was created by lnd_sel */
492 lnd_mar(struct emp_qelem *list, double *minmobp, double *maxmobp,
493 int *togetherp, natid actor)
495 struct emp_qelem *qp;
496 struct emp_qelem *next;
509 for (qp = list->q_back; qp != list; qp = next) {
511 llp = (struct ulist *)qp;
512 getland(llp->unit.land.lnd_uid, &land);
513 if (land.lnd_own != actor) {
514 mpr(actor, "%s was disbanded at %s\n",
515 prland(&land), xyas(land.lnd_x, land.lnd_y, land.lnd_own));
516 emp_remque((struct emp_qelem *)llp);
520 if (land.lnd_ship >= 0) {
521 lnd_mess("is on a ship", llp);
524 if (land.lnd_land >= 0) {
525 lnd_mess("is on a unit", llp);
528 if (!getsect(land.lnd_x, land.lnd_y, §)) {
529 lnd_mess("was sucked into the sky by a strange looking spaceland", llp); /* heh -KHS */
532 if (!(lchr[(int)llp->unit.land.lnd_type].l_flags & L_SPY) &&
533 !(lchr[(int)llp->unit.land.lnd_type].l_flags & L_TRAIN) &&
534 llp->unit.land.lnd_item[I_MILIT] == 0) {
535 lnd_mess("has no mil on it to guide it", llp);
538 rel = getrel(getnatp(sect.sct_own), player->cnum);
539 if (sect.sct_own != land.lnd_own && rel != ALLIED &&
540 !(lchr[(int)llp->unit.land.lnd_type].l_flags & L_SPY) &&
542 sprintf(mess, "has been kidnapped by %s", cname(sect.sct_own));
551 if (land.lnd_x != allx || land.lnd_y != ally)
553 if (land.lnd_mobil + 1 < (int)llp->mobil) {
554 llp->mobil = land.lnd_mobil;
556 if (llp->mobil < *minmobp)
557 *minmobp = llp->mobil;
558 if (llp->mobil > *maxmobp)
559 *maxmobp = llp->mobil;
560 llp->unit.land = land;
565 lnd_sweep(struct emp_qelem *land_list, int verbose, int takemob,
568 struct emp_qelem *qp;
569 struct emp_qelem *next;
572 int mines, m, max, sshells, lshells;
574 for (qp = land_list->q_back; qp != land_list; qp = next) {
576 llp = (struct ulist *)qp;
577 if (!(((struct lchrstr *)llp->chrp)->l_flags & L_ENGINEER)) {
579 mpr(actor, "%s is not an engineer!\n",
580 prland(&llp->unit.land));
583 if (takemob && llp->mobil < 0.0) {
585 lnd_mess("is out of mobility", llp);
588 getsect(llp->unit.land.lnd_x, llp->unit.land.lnd_y, §);
589 if (sect.sct_oldown == llp->unit.land.lnd_own) {
592 "%s is in a sector completely owned by you. Don't bother digging up mines there!\n",
593 prland(&llp->unit.land));
596 if (sect.sct_type == SCT_BSPAN) {
598 mpr(actor, "%s is on a bridge. No mines there!\n",
599 prland(&llp->unit.land));
603 llp->mobil -= lnd_pathcost(&llp->unit.land, 0.2);
604 llp->unit.land.lnd_mobil = (int)llp->mobil;
605 llp->unit.land.lnd_harden = 0;
607 putland(llp->unit.land.lnd_uid, &llp->unit.land);
608 if (!(mines = sect.sct_mines))
610 max = ((struct lchrstr *)llp->chrp)->l_item[I_SHELL];
611 lshells = llp->unit.land.lnd_item[I_SHELL];
612 sshells = sect.sct_item[I_SHELL];
613 for (m = 0; mines > 0 && m < max * 2; m++) {
614 if (chance(0.5 * ((struct lchrstr *)llp->chrp)->l_att)) {
615 mpr(actor, "Sweep...\n");
619 else if (sshells < ITEM_MAX)
623 sect.sct_mines = mines;
624 llp->unit.land.lnd_item[I_SHELL] = lshells;
625 sect.sct_item[I_SHELL] = sshells;
626 putland(llp->unit.land.lnd_uid, &llp->unit.land);
632 contains_engineer(struct emp_qelem *list)
634 struct emp_qelem *qp;
635 struct emp_qelem *next;
638 for (qp = list->q_back; qp != list; qp = next) {
640 llp = (struct ulist *)qp;
641 if (((struct lchrstr *)llp->chrp)->l_flags & L_ENGINEER)
648 lnd_check_mines(struct emp_qelem *land_list)
650 struct emp_qelem *qp;
651 struct emp_qelem *next;
655 int with_eng = contains_engineer(land_list);
657 for (qp = land_list->q_back; qp != land_list; qp = next) {
659 llp = (struct ulist *)qp;
660 getsect(llp->unit.land.lnd_x, llp->unit.land.lnd_y, §);
661 if (sect.sct_oldown == llp->unit.land.lnd_own)
663 if (sect.sct_type == SCT_BSPAN)
667 if (chance(DMINE_LHITCHANCE(sect.sct_mines) / (1 + 2 * with_eng))) {
668 lnd_hit_mine(&llp->unit.land, ((struct lchrstr *)llp->chrp));
671 putland(llp->unit.land.lnd_uid, &llp->unit.land);
672 if (!llp->unit.land.lnd_own) {
683 lnd_mess(char *str, struct ulist *llp)
685 mpr(llp->unit.land.lnd_own, "%s %s & stays in %s\n",
686 prland(&llp->unit.land),
687 str, xyas(llp->unit.land.lnd_x, llp->unit.land.lnd_y,
688 llp->unit.land.lnd_own));
689 if (llp->mobil < -127)
691 llp->unit.land.lnd_mobil = llp->mobil;
692 putland(llp->unit.land.lnd_uid, &llp->unit.land);
693 emp_remque((struct emp_qelem *)llp);
698 lnd_count(struct emp_qelem *list)
700 struct emp_qelem *qp;
701 struct emp_qelem *next;
704 for (qp = list->q_back; qp != list; qp = next) {
712 lnd_damage(struct emp_qelem *list, int totdam)
714 struct emp_qelem *qp;
715 struct emp_qelem *next;
720 if (!totdam || !(count = lnd_count(list)))
722 dam = ldround((double)totdam / count, 1);
723 for (qp = list->q_back; qp != list; qp = next) {
725 llp = (struct ulist *)qp;
726 /* have to get it again because of collateral damage */
727 getland(llp->unit.land.lnd_uid, &llp->unit.land);
728 landdamage(&llp->unit.land, dam);
729 putland(llp->unit.land.lnd_uid, &llp->unit.land);
730 if (!llp->unit.land.lnd_own) {
739 lnd_easiest_target(struct emp_qelem *list)
741 struct emp_qelem *qp;
742 struct emp_qelem *next;
745 int easiest = 9876; /* things start great for victim */
748 for (qp = list->q_back; qp != list; qp = next) {
750 llp = (struct ulist *)qp;
751 hard = lnd_hardtarget(&llp->unit.land);
753 easiest = hard; /* things get worse for victim */
756 return easiest - count;
760 lnd_missile_interdiction(struct emp_qelem *list, coord newx, coord newy,
764 struct emp_qelem msl_list, *qp, *newqp;
766 msl_sel(&msl_list, newx, newy, victim, P_T, P_MAR, MI_INTERDICT);
768 dam = msl_launch_mindam(&msl_list, newx, newy,
769 lnd_easiest_target(list), EF_LAND,
770 lnd_count(list) * 20, "troops", victim,
773 mpr(victim, "missile interdiction mission does %d damage!\n", dam);
774 collateral_damage(newx, newy, dam);
776 qp = msl_list.q_forw;
777 while (qp != msl_list.q_forw) {
787 /* Steve M. - commented out for now until abuse is decided upon */
788 /* risner: allow forts to interdict land units. */
790 lnd_fort_interdiction(struct emp_qelem *list,
791 coord newx, coord newy, natid victim)
802 snxtsct_dist(&ns, newx, newy, fort_max_interdiction_range);
803 while (nxtsct(&ns, &fsect)) {
804 if (fsect.sct_own == 0)
806 if (fsect.sct_own == victim)
808 if (getrel(getnatp(fsect.sct_own), victim) >= NEUTRAL)
810 range = roundrange(fortrange(&fsect));
811 trange = mapdist(newx, newy, fsect.sct_x, fsect.sct_y);
814 dam = fort_fire(&fsect);
819 mpr(victim, "Incoming fire does %d damage!\n", dam);
821 "%s fires at %s land units in %s for %d!\n",
822 xyas(fsect.sct_x, fsect.sct_y,
824 cname(victim), xyas(newx, newy, fsect.sct_own), dam);
825 nreport(fsect.sct_own, N_SCT_SHELL, victim, 1);
828 return lnd_damage(list, totdam);
834 lnd_interdict(struct emp_qelem *list, coord newx, coord newy, natid victim)
839 if (!opt_NO_FORT_FIRE)
840 /* Steve M. - commented out for now until abuse is decided upon */
841 stopping |= lnd_fort_interdiction(list, newx, newy, victim);
846 unit_interdict(newx, newy, victim, "land units",
847 lnd_easiest_target(list), MI_INTERDICT));
851 lnd_missile_interdiction(list, newx, newy, victim));
855 /* high value of hardtarget is harder to hit */
857 lnd_hardtarget(struct lndstr *lp)
861 getsect(lp->lnd_x, lp->lnd_y, §);
862 return (int)((lp->lnd_effic / 100.0) *
863 (10 + dchr[sect.sct_type].d_dstr * 2 + lnd_spd(lp) / 2.0
868 lnd_hit_mine(struct lndstr *lp, struct lchrstr *lcp)
872 mpr(lp->lnd_own, "Blammo! Landmines detected in %s! ",
873 xyas(lp->lnd_x, lp->lnd_y, lp->lnd_own));
875 nreport(lp->lnd_own, N_LHIT_MINE, 0, 1);
878 if (lcp->l_flags & L_ENGINEER)
886 lnd_pathcost(struct lndstr *lp, double pathcost)
890 effspd = lnd_spd(lp);
891 if (lchr[(int)lp->lnd_type].l_flags & L_SUPPLY)
892 effspd *= lp->lnd_effic * 0.01;
895 * The return value must be PATHCOST times a factor that depends
896 * only on the land unit. Anything else breaks path finding. In
897 * particular, you can't add or enforce a minimum cost here. Do
898 * it in sector_mcost().
900 return pathcost * 5.0 * speed_factor(effspd, lp->lnd_tech);
904 lnd_mobtype(struct lndstr *lp)
906 return (lchr[(int)lp->lnd_type].l_flags & L_TRAIN)
907 ? MOB_RAIL : MOB_MARCH;
911 lnd_mobcost(struct lndstr *lp, struct sctstr *sp)
913 return lnd_pathcost(lp, sector_mcost(sp, lnd_mobtype(lp)));
917 lnd_mar_one_sector(struct emp_qelem *list, int dir, natid actor,
920 struct sctstr sect, osect;
921 struct emp_qelem *qp;
922 struct emp_qelem *qp2;
923 struct emp_qelem *next;
925 struct emp_qelem cur, done;
937 if (dir <= DIR_STOP || dir >= DIR_VIEW) {
938 unit_put(list, actor);
943 for (qp = list->q_back; qp != list; qp = next) {
945 llp = (struct ulist *)qp;
946 getsect(llp->unit.land.lnd_x, llp->unit.land.lnd_y, &osect);
947 oldown = osect.sct_own;
948 newx = xnorm(llp->unit.land.lnd_x + dx);
949 newy = ynorm(llp->unit.land.lnd_y + dy);
950 getsect(newx, newy, §);
951 rel = getrel(getnatp(sect.sct_own), player->cnum);
952 if ((sect.sct_own != actor && rel != ALLIED &&
953 !(lchr[(int)llp->unit.land.lnd_type].l_flags & L_SPY) &&
954 sect.sct_own) || (sect.sct_type == SCT_WATER ||
955 sect.sct_type == SCT_SANCT ||
956 sect.sct_type == SCT_WASTE)) {
958 pr("can't go to %s\n", xyas(newx, newy, actor));
961 sprintf(dp, "can't go to %s", xyas(newx, newy, actor));
966 if ((!intrchr[INT_RAIL].in_enable || sect.sct_rail == 0)
967 && lnd_mobtype(&llp->unit.land) == MOB_RAIL) {
969 pr("no rail system in %s\n", xyas(newx, newy, actor));
972 sprintf(dp, "has no rail system in %s",
973 xyas(newx, newy, actor));
978 /* Note we check would_abandon first because we don't want
979 to always have to do these checks */
980 if (would_abandon(&osect, I_CIVIL, 0, &llp->unit.land)) {
982 if (!want_to_abandon(&osect, I_CIVIL, 0, &llp->unit.land)) {
985 /* now check stuff */
986 if (!check_sect_ok(§))
988 if (!check_sect_ok(&osect))
990 for (qp2 = list->q_back; qp2 != list; qp2 = qp2->q_back) {
991 if (!check_land_ok(&((struct ulist *)qp2)->unit.land))
995 lnd_mess("stops", llp);
999 if (llp->mobil <= 0.0) {
1000 lnd_mess("is out of mobility", llp);
1003 llp->unit.land.lnd_x = newx;
1004 llp->unit.land.lnd_y = newy;
1005 llp->mobil -= lnd_mobcost(&llp->unit.land, §);
1006 llp->unit.land.lnd_mobil = (int)llp->mobil;
1007 llp->unit.land.lnd_harden = 0;
1008 putland(llp->unit.land.lnd_uid, &llp->unit.land);
1010 getsect(osect.sct_x, osect.sct_y, &osect);
1011 if (osect.sct_own != oldown && oldown == player->cnum) {
1012 /* It was your sector, now it's not. Simple :) */
1013 pr("You no longer own %s\n",
1014 xyas(osect.sct_x, osect.sct_y, player->cnum));
1016 if (rel != ALLIED && sect.sct_own != actor && sect.sct_own) { /* must be a spy */
1017 /* Always a 10% chance of getting caught. */
1018 if (chance(LND_SPY_DETECT_CHANCE(llp->unit.land.lnd_effic))) {
1019 if (rel == NEUTRAL || rel == FRIENDLY) {
1021 "%s unit spotted in %s\n", cname(player->cnum),
1022 xyas(sect.sct_x, sect.sct_y, sect.sct_own));
1023 setrel(sect.sct_own, llp->unit.land.lnd_own, HOSTILE);
1024 } else if (rel == HOSTILE || rel == AT_WAR ||
1025 rel == SITZKRIEG || rel == MOBILIZATION) {
1027 "%s spy shot in %s\n", cname(player->cnum),
1028 xyas(sect.sct_x, sect.sct_y, sect.sct_own));
1029 pr("%s was shot and killed.\n", prland(&llp->unit.land));
1030 llp->unit.land.lnd_effic = 0;
1031 putland(llp->unit.land.lnd_uid, &llp->unit.land);
1039 lnd_sweep(list, 0, 1, actor);
1040 stopping |= lnd_check_mines(list);
1044 /* interdict land units sector by sector */
1047 while (!QEMPTY(list)) {
1048 llp = (struct ulist *)list->q_back;
1049 newx = llp->unit.land.lnd_x;
1050 newy = llp->unit.land.lnd_y;
1051 /* move units in NEWX,NEWY to cur */
1053 for (qp = list->q_back; qp != list; qp = next) {
1055 llp = (struct ulist *)qp;
1056 if (llp->unit.land.lnd_x == newx && llp->unit.land.lnd_y == newy) {
1058 emp_insque(qp, &cur);
1059 if (!(lchr[(int)llp->unit.land.lnd_type].l_flags & L_SPY))
1063 /* interdict them */
1065 stopping |= lnd_interdict(&cur, newx, newy, actor);
1066 /* move survivors to done */
1067 for (qp = cur.q_back; qp != &cur; qp = next) {
1069 llp = (struct ulist *)qp;
1071 emp_insque(qp, &done);
1074 /* assign surviving land units back to list */
1075 emp_insque(list, &done);
1082 * find all artillery units belonging
1083 * to the attacker or defender that can fire.
1084 * Each arty unit adds +1%/damage point
1087 lnd_support(natid victim, natid attacker, coord x, coord y, int defending)
1089 struct nstr_item ni;
1097 snxtitem_all(&ni, EF_LAND);
1098 while (nxtitem(&ni, &land)) {
1099 if ((land.lnd_x == x) && (land.lnd_y == y))
1101 rel = getrel(getnatp(land.lnd_own), attacker);
1102 rel2 = getrel(getnatp(land.lnd_own), victim);
1103 if ((land.lnd_own != attacker) &&
1104 ((rel != ALLIED) || (rel2 != AT_WAR)))
1107 /* are we in range? */
1108 dist = mapdist(land.lnd_x, land.lnd_y, x, y);
1110 range = roundrange(lnd_fire_range(&land));
1114 dam2 = lnd_fire(&land);
1115 putland(land.lnd_uid, &land);
1120 nreport(land.lnd_own, N_FIRE_BACK, victim, 1);
1122 nreport(land.lnd_own, N_FIRE_L_ATTACK, victim, 1);
1123 if (roll(100) < lnd_acc(&land))
1126 if (land.lnd_own != attacker)
1128 "%s supported %s at %s\n",
1129 prland(&land), cname(attacker), xyas(x, y, land.lnd_own));
1135 lnd_can_attack(struct lndstr *lp)
1137 struct lchrstr *lcp = &lchr[(int)lp->lnd_type];
1139 if (lcp->l_flags & L_SUPPLY)
1146 * Increase fortification value of LP.
1147 * Fortification costs mobility. Use up to MOB mobility.
1148 * Return actual fortification increase.
1151 lnd_fortify(struct lndstr *lp, int mob)
1154 double mob_used, mult;
1156 if (lp->lnd_ship >= 0 || lp->lnd_land >= 0)
1159 mob_used = MIN(lp->lnd_mobil, mob);
1163 mult = has_helpful_engineer(lp->lnd_x, lp->lnd_y, lp->lnd_own)
1166 hard_amt = (int)(mob_used * mult);
1167 if (lp->lnd_harden + hard_amt > land_mob_max) {
1168 hard_amt = land_mob_max - lp->lnd_harden;
1169 mob_used = ceil(hard_amt / mult);
1172 lp->lnd_mobil -= (int)mob_used;
1173 lp->lnd_harden += hard_amt;
1174 lp->lnd_harden = MIN(lp->lnd_harden, land_mob_max);
1180 * Is there a engineer unit at X,Y that can help nation CN?
1183 has_helpful_engineer(coord x, coord y, natid cn)
1185 struct nstr_item ni;
1188 snxtitem_xy(&ni, EF_LAND, x, y);
1189 while (nxtitem(&ni, &land)) {
1190 if (land.lnd_own != cn && getrel(getnatp(land.lnd_own), cn) != ALLIED)
1192 if (lchr[(int)land.lnd_type].l_flags & L_ENGINEER)
1200 * Set LP's tech to TLEV along with everything else that depends on it.
1203 lnd_set_tech(struct lndstr *lp, int tlev)
1205 struct lchrstr *lcp = lchr + lp->lnd_type;
1207 if (CANT_HAPPEN(tlev < lcp->l_tech))
1210 lp->lnd_tech = tlev;