/*
* Empire - A multi-player, client/server Internet based war game.
* Copyright (C) 1986-2021, Dave Pare, Jeff Bailey, Thomas Ruschak,
* Ken Stevens, Steve McClure, Markus Armbruster
*
* Empire is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*
* ---
*
* See files README, COPYING and CREDITS in the root of the source
* tree for related information and legal notices. It is expected
* that future projects/authors will amend these files as needed.
*
* ---
*
* mslsub.c: Missile subroutine stuff
*
* Known contributors to this file:
* Ken Stevens, 1995
* Steve McClure, 1996-2000
* Markus Armbruster, 2004-2012
*/
#include
#include
#include "chance.h"
#include "misc.h"
#include "nat.h"
#include "news.h"
#include "nsc.h"
#include "nuke.h"
#include "optlist.h"
#include "plague.h"
#include "plane.h"
#include "prototypes.h"
#include "queue.h"
#include "sect.h"
#include "ship.h"
#include "xy.h"
int
msl_launch(struct plnstr *pp, int type, char *what, coord x, coord y,
natid victim, int *sublaunchp)
{
struct shpstr ship;
struct nukstr nuke;
int sublaunch = 0;
char *base, *in_or_at, *from;
mpr(pp->pln_own, "Preparing to launch %s at %s %s %s%s\n",
prplane(pp),
cname(victim),
what,
type != EF_SECTOR ? "in " : "",
xyas(x, y, pp->pln_own));
if (pp->pln_ship >= 0) {
getship(pp->pln_ship, &ship);
base = prship(&ship);
in_or_at = " in ";
if (mchr[(int)ship.shp_type].m_flags & M_SUB) {
sublaunch = 1;
from = "in hatch";
} else
from = "on deck";
} else {
if (pp->pln_harden > 0) {
base = "missile silo";
in_or_at = " at ";
from = "in silo";
} else {
base = in_or_at = "";
from = "on launch pad";
}
}
mpr(pp->pln_own, "\tLaunching from %s%s%s\n",
base, in_or_at, xyas(pp->pln_x, pp->pln_y, pp->pln_own));
CANT_HAPPEN(pp->pln_flags & PLN_LAUNCHED);
pp->pln_flags |= PLN_LAUNCHED;
putplane(pp->pln_uid, pp);
if (chance((0.05 + (100 - pp->pln_effic) / 100.0)
* (1 - techfact(pp->pln_tech, 1.0)))) {
mpr(pp->pln_own, "KABOOOOM! Missile explodes %s!\n", from);
if (getnuke(nuk_on_plane(pp), &nuke)) {
mpr(pp->pln_own, "%s lost!\n", prnuke(&nuke));
nuke.nuk_effic = 0;
putnuke(nuke.nuk_uid, &nuke);
}
#if 0
/*
* Disabled for now, because it breaks callers that call
* msl_launch() for each member of a list of planes, created
* by msl_sel() or perform_mission(). Damage to the base can
* damage other planes. Any copies of them in the list become
* stale. When msl_launch() modifies and writes back such a
* stale copy, the damage gets wiped out, triggering a seqno
* oops.
*/
if (chance(0.33)) {
struct sctstr sect;
int dam;
dam = pln_damage(pp, 'p', NULL) / 2;
if (pp->pln_ship >= 0) {
shipdamage(&ship, dam);
putship(ship.shp_uid, &ship);
} else {
mpr(pp->pln_own, "Explosion damages %s %d%%\n",
xyas(pp->pln_x, pp->pln_y, pp->pln_own), dam);
getsect(pp->pln_x, pp->pln_y, §);
sectdamage(§, dam);
putsect(§);
}
}
#endif
return -1;
}
mpr(pp->pln_own, "\tSHWOOOOOSH! Missile launched!\n");
if (type != EF_PLANE)
mpr(victim, "Incoming %s missile sighted at %s...\n",
sublaunch ? "sub-launched" : cname(pp->pln_own),
xyas(x, y, victim));
if (type == EF_SECTOR || type == EF_LAND) {
if (msl_abm_intercept(pp, x, y, sublaunch))
return -1;
}
if (type == EF_SHIP) {
if (shp_missile_defense(x, y, pp->pln_own, pln_def(pp))) {
return -1;
}
}
if (sublaunchp)
*sublaunchp = sublaunch;
return 0;
}
int
msl_hit(struct plnstr *pp, int hardtarget, int type,
int news_item, int snews_item, int sublaunch, natid victim)
{
int hitchance, hit;
if (nuk_on_plane(pp) >= 0) {
mpr(pp->pln_own, "\tArming nuclear warheads...\n");
hit = 1;
} else {
hitchance = pln_hitchance(pp, hardtarget, type);
hit = pct_chance(hitchance);
mpr(pp->pln_own, "\t%d%% hit chance...%s\n", hitchance,
hit ? "HIT!" : "miss");
}
if (type != EF_PLANE)
mpr(victim, "...Incoming %s missile %s\n",
sublaunch ? "" : cname(pp->pln_own),
hit ? "HIT!\n" : "missed\n");
if (hit && news_item) {
if (sublaunch)
nreport(victim, snews_item, 0, 1);
else
nreport(pp->pln_own, news_item, victim, 1);
}
return hit;
}
void
msl_sel(struct emp_qelem *list, coord x, coord y, natid victim,
int wantflags, int nowantflags, int mission)
{
struct plchrstr *pcp;
struct plnstr plane;
struct plist *irv;
struct nstr_item ni;
emp_initque(list);
snxtitem_all(&ni, EF_PLANE);
while (nxtitem(&ni, &plane)) {
if (!plane.pln_own)
continue;
pcp = &plchr[(int)plane.pln_type];
if (!(pcp->pl_flags & P_M))
continue;
if (wantflags && (pcp->pl_flags & wantflags) != wantflags)
continue;
if (nowantflags && pcp->pl_flags & nowantflags)
continue;
if (mission && plane.pln_mission != mission)
continue;
if (mission &&
plane.pln_radius < mapdist(x, y, plane.pln_opx, plane.pln_opy))
continue;
if (relations_with(plane.pln_own, victim) >= NEUTRAL)
continue;
/* missiles go one way, so we can use all the range */
if (plane.pln_range < mapdist(x, y, plane.pln_x, plane.pln_y))
continue;
if (plane.pln_mobil <= 0)
continue;
if (plane.pln_effic < 100)
continue;
if (opt_MARKET) {
if (ontradingblock(EF_PLANE, &plane))
continue;
}
if (!pln_airbase_ok(&plane, 1, 0))
continue;
/* got a valid interceptor */
irv = malloc(sizeof(*irv));
irv->load = 0;
irv->pstage = PLG_HEALTHY;
irv->pcp = &plchr[(int)plane.pln_type];
irv->plane = plane;
emp_insque(&irv->queue, list);
}
}
static int
msl_intercept(struct plnstr *msl, struct sctstr *sp, int sublaunch,
struct emp_qelem *irvlist, char *att_name, char *def_name,
int news_item)
{
struct plnstr *pp;
struct emp_qelem *intlist;
struct emp_qelem intfoo;
struct emp_qelem *qp;
struct emp_qelem *next;
struct plist *ip;
int icount = 0;
short destroyed;
char *who = sublaunch ? "" : cname(msl->pln_own);
intlist = &intfoo;
emp_initque(intlist);
/* First choose interceptors belonging to the target sector */
/* only allow two defense missiles per missile attack */
for (qp = irvlist->q_forw; qp != irvlist && icount < 2; qp = next) {
next = qp->q_forw;
ip = (struct plist *)qp;
pp = &ip->plane;
if (pp->pln_own != sp->sct_own)
continue;
if (mission_pln_equip(ip, NULL, 'i') < 0) {
emp_remque(qp);
free(qp);
continue;
}
/* got one interceptor, delete from irv_list and
* add to int_list.
*/
emp_remque(qp);
emp_insque(qp, intlist);
putplane(pp->pln_uid, pp);
icount++;
}
/* only allow two defense missiles per missile attack */
for (qp = irvlist->q_forw; qp != irvlist && icount < 2; qp = next) {
next = qp->q_forw;
ip = (struct plist *)qp;
pp = &ip->plane;
if (mission_pln_equip(ip, NULL, 'i') < 0) {
emp_remque(qp);
free(qp);
continue;
}
/* got one interceptor, delete from irv_list and
* add to int_list.
*/
emp_remque(qp);
emp_insque(qp, intlist);
putplane(pp->pln_uid, pp);
icount++;
}
/* Now, clean out the queue */
while (!QEMPTY(irvlist)) {
qp = irvlist->q_forw;
emp_remque(qp);
free(qp);
}
if (icount == 0) {
mpr(sp->sct_own, "No %ss launched to intercept.\n", def_name);
return 0;
}
/* attempt to destroy incoming missile */
destroyed = 0;
while (!destroyed && !QEMPTY(intlist)) {
qp = intlist->q_forw;
ip = (struct plist *)qp;
pp = &ip->plane;
mpr(msl->pln_own, "%s %s launched in defense!\n",
cname(pp->pln_own), def_name);
if (sp->sct_own == pp->pln_own) {
mpr(sp->sct_own, "%s launched to intercept %s %s!\n",
def_name, who, att_name);
} else {
mpr(sp->sct_own,
"%s launched an %s to intercept the %s %s!\n",
cname(pp->pln_own), def_name, who, att_name);
mpr(pp->pln_own,
"%s launched to intercept %s %s arcing towards %s territory!\n",
def_name, who, att_name, cname(sp->sct_own));
}
if (msl_launch(pp, EF_PLANE, att_name, sp->sct_x, sp->sct_y,
msl->pln_own, NULL) >= 0
&& msl_hit(pp, pln_def(msl), EF_PLANE, 0, 0, 0, msl->pln_own)) {
mpr(msl->pln_own, "%s destroyed by %s %s!\n",
att_name, cname(pp->pln_own), def_name);
mpr(sp->sct_own, "%s %s intercepted!\n", who, att_name);
if (sp->sct_own != pp->pln_own)
mpr(pp->pln_own, "%s %s intercepted!\n", who, att_name);
if (sublaunch)
nreport(pp->pln_own, news_item, 0, 1);
else
nreport(pp->pln_own, news_item, msl->pln_own, 1);
destroyed = 1;
}
/* zap the missile */
pp->pln_effic = 0;
putplane(pp->pln_uid, pp);
emp_remque(qp);
free(qp);
}
/* Clean out what is left in the list */
while (!QEMPTY(intlist)) {
qp = intlist->q_forw;
emp_remque(qp);
free(qp);
}
if (destroyed)
return 1;
if (icount) {
mpr(msl->pln_own, "%s made it through %s defenses!\n",
att_name, def_name);
mpr(sp->sct_own, "%s made it through %s defenses!\n",
att_name, def_name);
}
return 0;
}
int
msl_abm_intercept(struct plnstr *msl, coord x, coord y, int sublaunch)
{
struct sctstr sect;
struct emp_qelem irvlist;
getsect(x, y, §);
msl_sel(&irvlist, x, y, msl->pln_own, P_N, P_O, 0);
return msl_intercept(msl, §, sublaunch,
&irvlist, "warhead", "abm",
sublaunch ? N_NUKE_SSTOP : N_NUKE_STOP);
}
int
msl_asat_intercept(struct plnstr *msl, coord x, coord y)
{
struct sctstr sect;
struct emp_qelem irvlist;
getsect(x, y, §);
mpr(sect.sct_own, "%s has positioned a satellite over %s\n",
cname(msl->pln_own), xyas(x, y, sect.sct_own));
msl_sel(&irvlist, x, y, msl->pln_own, P_O, 0, 0);
return msl_intercept(msl, §, 0,
&irvlist, "satellite", "a-sat missile",
N_SAT_KILL);
}