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empserver/src/lib/subs/mission.c
Markus Armbruster bb467c335d Update copyright notice 
Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
2014-01-02 14:33:48 +01:00

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/*
* Empire - A multi-player, client/server Internet based war game.
* Copyright (C) 1986-2014, 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 <http://www.gnu.org/licenses/>.
*
* ---
*
* 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.
*
* ---
*
* mission.c: Mission subroutines for planes/ships/units
*
* Known contributors to this file:
* Ken Stevens, 1995
* Steve McClure, 1996-2000
* Markus Armbruster, 2003-2012
*/
#include <config.h>
#include <stdlib.h>
#include "chance.h"
#include "empobj.h"
#include "file.h"
#include "item.h"
#include "misc.h"
#include "mission.h"
#include "news.h"
#include "nsc.h"
#include "optlist.h"
#include "path.h"
#include "plague.h"
#include "prototypes.h"
#include "queue.h"
#include "xy.h"
struct genlist {
struct emp_qelem queue; /* list of units */
struct empobj *thing; /* thing's struct */
};
struct airport {
struct emp_qelem queue;
coord x, y;
natid own;
};
static void add_airport(struct emp_qelem *, coord, coord);
static int air_damage(struct emp_qelem *, coord, coord, int, natid,
char *, int);
static void build_mission_list(struct genlist[],
unsigned char[], unsigned char[],
coord, coord, int);
static void build_mission_list_type(struct genlist[], unsigned char[],
coord, coord, int, int);
static void divide(struct emp_qelem *, struct emp_qelem *, coord, coord);
static int dosupport(coord, coord, natid, natid, int);
static int find_airport(struct emp_qelem *, coord, coord);
static void mission_pln_arm(struct emp_qelem *, coord, coord, int,
int, struct ichrstr *);
static void mission_pln_sel(struct emp_qelem *, int, int, int);
static int perform_mission_land(int, struct lndstr *, coord, coord,
natid, int, char *, int);
static int perform_mission_ship(int, struct shpstr *, coord, coord,
natid, int, char *, int);
static int perform_mission_msl(int, struct emp_qelem *, coord, coord,
natid, int);
static int perform_mission_bomb(int, struct emp_qelem *, coord, coord,
natid, int, char *, int, int);
static int perform_mission(coord, coord, natid, struct emp_qelem *,
int, char *, int);
static int
tally_dam(int dam, int newdam)
{
return dam < 0 ? newdam : dam + newdam;
}
/*
* Interdict commodities & transported planes
*/
int
ground_interdict(coord x, coord y, natid victim, char *s)
{
int cn;
int dam = 0, newdam;
unsigned char act[MAXNOC];
struct genlist mi[MAXNOC];
memset(mi, 0, sizeof(mi));
act[0] = 0;
for (cn = 1; cn < MAXNOC; cn++) {
act[cn] = relations_with(cn, victim) <= HOSTILE;
emp_initque((struct emp_qelem *)&mi[cn]);
}
build_mission_list(mi, act, act, x, y, MI_INTERDICT);
for (cn = 1; cn < MAXNOC; cn++) {
if (QEMPTY(&mi[cn].queue))
continue;
newdam = perform_mission(x, y, victim, &mi[cn].queue,
MI_INTERDICT, s, SECT_HARDTARGET);
if (newdam > 0) {
dam += newdam;
mpr(victim, "%s interdiction mission does %d damage!\n",
cname(cn), newdam);
}
}
if (dam) {
collateral_damage(x, y, dam);
}
return dam;
}
int
collateral_damage(coord x, coord y, int dam)
{
int coll;
struct sctstr sect;
if (!dam)
return 0;
getsect(x, y, &sect);
if (sect.sct_own) {
coll = ldround((double)dam * collateral_dam, 1);
if (coll == 0)
return 0;
mpr(sect.sct_own, "%s takes %d%% collateral damage\n",
xyas(x, y, sect.sct_own), coll);
sectdamage(&sect, coll);
putsect(&sect);
return coll;
}
return 0;
}
static int
only_subs(struct emp_qelem *list)
{
struct emp_qelem *qp;
struct genlist *glp;
for (qp = list->q_forw; qp != list; qp = qp->q_forw) {
glp = (struct genlist *)qp;
if (glp->thing->ef_type != EF_SHIP)
return 0;
if (!(mchr[glp->thing->type].m_flags & M_SUB))
return 0;
/* It's a sub! */
}
/* They were all subs! */
return 1;
}
/*
* Interdict ships & land units
*/
int
unit_interdict(coord x, coord y, natid victim, char *s, int hardtarget,
int mission)
{
int cn, rel, newdam, osubs;
int dam = -1;
unsigned char plane_act[MAXNOC], other_act[MAXNOC];
struct genlist mi[MAXNOC];
memset(mi, 0, sizeof(mi));
other_act[0] = plane_act[0] = 0;
for (cn = 1; cn < MAXNOC; cn++) {
rel = relations_with(cn, victim);
other_act[cn] = rel <= HOSTILE;
plane_act[cn] = mission == MI_SINTERDICT
? rel <= NEUTRAL : other_act[cn];
emp_initque((struct emp_qelem *)&mi[cn]);
}
build_mission_list(mi, other_act, plane_act, x, y, mission);
for (cn = 1; cn < MAXNOC; cn++) {
if (QEMPTY(&mi[cn].queue))
continue;
osubs = only_subs(&mi[cn].queue);
newdam = perform_mission(x, y, victim, &mi[cn].queue,
mission, s, hardtarget);
dam = tally_dam(dam, newdam);
if (newdam > 0)
mpr(victim, "%s interdiction mission does %d damage!\n",
osubs ? "Enemy" : cname(cn), newdam);
}
if (dam > 0)
collateral_damage(x, y, dam);
return dam;
}
/*
* Perform a mission against victim, on behalf of actee
*/
int
off_support(coord x, coord y, natid victim, natid actee)
{
return dosupport(x, y, victim, actee, MI_OSUPPORT);
}
/*
* Perform a mission against victim, on behalf of actee
*/
int
def_support(coord x, coord y, natid victim, natid actee)
{
return dosupport(x, y, victim, actee, MI_DSUPPORT);
}
/*
* Perform support missions in X,Y against VICTIM for ACTEE.
* MISSION is either MI_OSUPPORT or MI_DSUPPORT.
* Return total damage.
*/
static int
dosupport(coord x, coord y, natid victim, natid actee, int mission)
{
int cn;
unsigned char act[MAXNOC];
struct genlist mi[MAXNOC];
int newdam;
int dam = 0;
memset(mi, 0, sizeof(mi));
act[0] = 0;
for (cn = 1; cn < MAXNOC; cn++) {
act[cn] = feels_like_helping(cn, actee, victim);
emp_initque((struct emp_qelem *)&mi[cn]);
}
build_mission_list(mi, act, act, x, y, MI_SUPPORT);
build_mission_list(mi, act, act, x, y, mission);
for (cn = 1; cn < MAXNOC; cn++) {
if (QEMPTY(&mi[cn].queue))
continue;
newdam = perform_mission(x, y, victim, &mi[cn].queue, MI_SUPPORT,
"", SECT_HARDTARGET);
if (newdam > 0)
dam += newdam;
}
return dam;
}
static void
build_mission_list(struct genlist mi[],
unsigned char other_act[], unsigned char plane_act[],
coord x, coord y, int mission)
{
build_mission_list_type(mi, other_act, x, y, mission, EF_LAND);
build_mission_list_type(mi, other_act, x, y, mission, EF_SHIP);
build_mission_list_type(mi, plane_act, x, y, mission, EF_PLANE);
}
static void
build_mission_list_type(struct genlist mi[], unsigned char act[],
coord x, coord y, int mission, int type)
{
struct nstr_item ni;
struct genlist *glp;
struct empobj *gp;
union empobj_storage item;
snxtitem_all(&ni, type);
while (nxtitem(&ni, &item)) {
gp = (struct empobj *)&item;
if (!act[gp->own])
continue;
if (gp->mobil < 1)
continue;
if ((gp->mission != mission) && (mission != MI_SINTERDICT))
continue;
if ((gp->mission != mission) && (mission == MI_SINTERDICT) &&
(gp->mission != MI_INTERDICT))
continue;
if (!in_oparea(gp, x, y))
continue;
glp = malloc(sizeof(struct genlist));
memset(glp, 0, sizeof(struct genlist));
glp->thing = malloc(sizeof(item));
memcpy(glp->thing, &item, sizeof(item));
emp_insque(&glp->queue, &mi[gp->own].queue);
}
}
static void
find_escorts(coord x, coord y, natid cn, struct emp_qelem *escorts)
{
struct nstr_item ni;
struct plist *plp;
struct plnstr plane;
snxtitem_all(&ni, EF_PLANE);
while (nxtitem(&ni, &plane)) {
if (plane.pln_own != cn)
continue;
if (plane.pln_mission != MI_ESCORT)
continue;
if (!in_oparea((struct empobj *)&plane, x, y))
continue;
plp = malloc(sizeof(struct plist));
plp->load = 0;
plp->pstage = PLG_HEALTHY;
plp->pcp = &plchr[(int)plane.pln_type];
plp->plane = plane;
emp_insque(&plp->queue, escorts);
}
}
static int
perform_mission(coord x, coord y, natid victim, struct emp_qelem *list,
int mission, char *s, int hardtarget)
{
struct emp_qelem *qp, missiles, bombers;
struct genlist *glp;
struct plist *plp;
struct plchrstr *pcp;
int dam = -1;
int targeting_ships = *s == 's'; /* "subs" or "ships" FIXME gross! */
emp_initque(&missiles);
emp_initque(&bombers);
for (qp = list->q_forw; qp != list; ) {
glp = (struct genlist *)qp;
qp = qp->q_forw;
if (glp->thing->ef_type == EF_LAND) {
dam = perform_mission_land(dam, (struct lndstr *)glp->thing,
x, y, victim, mission, s,
targeting_ships);
} else if (glp->thing->ef_type == EF_SHIP) {
dam = perform_mission_ship(dam, (struct shpstr *)glp->thing,
x, y, victim, mission, s,
targeting_ships);
} else if (glp->thing->ef_type == EF_PLANE) {
pcp = &plchr[glp->thing->type];
if ((pcp->pl_flags & P_M)
&& (hardtarget != SECT_HARDTARGET
|| (pcp->pl_flags & P_MAR)))
; /* units have their own missile interdiction */
else {
/* save planes for later */
plp = malloc(sizeof(struct plist));
plp->load = 0;
plp->pstage = PLG_HEALTHY;
plp->pcp = pcp;
memcpy(&plp->plane, glp->thing, sizeof(struct plnstr));
if (plp->pcp->pl_flags & P_M)
emp_insque(&plp->queue, &missiles);
else
emp_insque(&plp->queue, &bombers);
}
} else {
CANT_REACH();
break;
}
free(glp->thing);
free(glp);
}
dam = perform_mission_msl(dam, &missiles, x, y, victim, hardtarget);
dam = perform_mission_bomb(dam, &bombers, x, y, victim, mission, s,
hardtarget, targeting_ships);
return dam;
}
static int
perform_mission_land(int dam, struct lndstr *lp, coord x, coord y,
natid victim, int mission, char *s,
int targeting_ships)
{
int md, range, dam2;
if (mission == MI_SINTERDICT)
return dam;
md = mapdist(x, y, lp->lnd_x, lp->lnd_y);
if (mission == MI_INTERDICT && md > land_max_interdiction_range)
return dam;
range = roundrange(lnd_fire_range(lp));
if (md > range)
return dam;
dam2 = lnd_fire(lp);
putland(lp->lnd_uid, lp);
if (dam2 < 0)
return dam;
if (targeting_ships) {
if (chance(lnd_acc(lp) / 100.0))
dam2 = ldround(dam2 / 2.0, 1);
}
if (targeting_ships)
nreport(lp->lnd_own, N_SHP_SHELL, victim, 1);
else
nreport(lp->lnd_own, N_SCT_SHELL, victim, 1);
wu(0, lp->lnd_own,
"%s fires at %s %s at %s\n",
prland(lp), cname(victim), s, xyas(x, y, lp->lnd_own));
mpr(victim, "%s %s fires at you at %s\n",
cname(lp->lnd_own), prland(lp), xyas(x, y, victim));
return tally_dam(dam, dam2);
}
static int
perform_mission_ship(int dam, struct shpstr *sp, coord x, coord y,
natid victim, int mission, char *s,
int targeting_ships)
{
struct mchrstr *mcp = &mchr[sp->shp_type];
double vrange, hitchance;
int md, range, dam2;
md = mapdist(x, y, sp->shp_x, sp->shp_y);
if ((mission == MI_INTERDICT || mission == MI_SINTERDICT)
&& md > ship_max_interdiction_range)
return dam;
if (mission == MI_SINTERDICT) {
if (!(mcp->m_flags & M_SONAR))
return dam;
if (!(mcp->m_flags & M_DCH) && !(mcp->m_flags & M_SUBT))
return dam;
vrange = techfact(sp->shp_tech, mcp->m_vrnge);
vrange *= sp->shp_effic / 200.0;
if (md > vrange)
return dam;
/* can't look all the time */
if (chance(0.5))
return dam;
}
if (mcp->m_flags & M_SUB) {
if (!targeting_ships)
return dam; /* subs interdict only ships */
range = roundrange(torprange(sp));
if (md > range)
return dam;
if (!line_of_sight(NULL, x, y, sp->shp_x, sp->shp_y))
return dam;
dam2 = shp_torp(sp, 1);
putship(sp->shp_uid, sp);
if (dam2 < 0)
return dam;
hitchance = shp_torp_hitchance(sp, md);
wu(0, sp->shp_own,
"%s locking on %s %s in %s\n",
prship(sp), cname(victim), s, xyas(x, y, sp->shp_own));
wu(0, sp->shp_own,
"\tEffective torpedo range is %d.0\n", range);
wu(0, sp->shp_own,
"\tWhooosh... Hitchance = %d%%\n",
(int)(hitchance * 100));
if (!chance(hitchance)) {
wu(0, sp->shp_own, "\tMissed\n");
mpr(victim,
"Incoming torpedo sighted @ %s missed (whew)!\n",
xyas(x, y, victim));
return tally_dam(dam, 0);
}
wu(0, sp->shp_own, "\tBOOM!...\n");
nreport(victim, N_TORP_SHIP, 0, 1);
wu(0, sp->shp_own,
"\tTorpedo hit %s %s for %d damage\n",
cname(victim), s, dam2);
mpr(victim,
"Incoming torpedo sighted @ %s hits and does %d damage!\n",
xyas(x, y, victim), dam2);
} else {
range = roundrange(shp_fire_range(sp));
if (md > range)
return dam;
if (mission == MI_SINTERDICT)
dam2 = shp_dchrg(sp);
else
dam2 = shp_fire(sp);
putship(sp->shp_uid, sp);
if (dam2 < 0)
return dam;
if (targeting_ships)
nreport(sp->shp_own, N_SHP_SHELL, victim, 1);
else
nreport(sp->shp_own, N_SCT_SHELL, victim, 1);
wu(0, sp->shp_own,
"%s fires at %s %s at %s\n",
prship(sp), cname(victim), s, xyas(x, y, sp->shp_own));
mpr(victim, "%s %s fires at you at %s\n",
cname(sp->shp_own), prship(sp), xyas(x, y, victim));
}
return tally_dam(dam, dam2);
}
static int
perform_mission_msl(int dam, struct emp_qelem *missiles, coord x, coord y,
natid victim, int hardtarget)
{
int performed, air_dam, sublaunch, dam2;
struct emp_qelem *qp, *newqp;
struct plist *plp;
/*
* Missiles, except for interdiction of ships or land units,
* because that happens elsewhere, in shp_missile_interdiction()
* and lnd_missile_interdiction().
*/
performed = air_dam = 0;
for (qp = missiles->q_back; qp != missiles; qp = newqp) {
newqp = qp->q_back;
plp = (struct plist *)qp;
if (air_dam < 100
&& !CANT_HAPPEN(hardtarget != SECT_HARDTARGET
|| (plp->pcp->pl_flags & P_MAR))
&& mission_pln_equip(plp, NULL, 'p') >= 0) {
if (msl_launch(&plp->plane, EF_SECTOR, "sector", x, y, victim,
&sublaunch) < 0)
goto use_up_msl;
performed = 1;
if (!msl_hit(&plp->plane, SECT_HARDTARGET, EF_SECTOR,
N_SCT_MISS, N_SCT_SMISS, sublaunch, victim))
CANT_REACH();
dam2 = pln_damage(&plp->plane, 'p', 1);
air_dam += dam2;
use_up_msl:
plp->plane.pln_effic = 0;
putplane(plp->plane.pln_uid, &plp->plane);
}
emp_remque(qp);
free(qp);
}
return performed ? tally_dam(dam, air_dam) : dam;
}
static int
perform_mission_bomb(int dam, struct emp_qelem *bombers, coord x, coord y,
natid victim, int mission, char *s, int hardtarget,
int targeting_ships)
{
struct emp_qelem *qp, *newqp, escorts, airp, b, e;
struct plist *plp;
int plane_owner, performed, air_dam;
size_t md;
emp_initque(&escorts);
emp_initque(&airp);
if (QEMPTY(bombers))
return dam;
plp = (struct plist *)bombers->q_forw;
plane_owner = plp->plane.pln_own;
/*
* If there are planes performing an
* interdict or support mission, find
* some escorts for them, if possible.
* Up to 2 per bomber, if possible.
*/
find_escorts(x, y, plane_owner, &escorts);
if (mission == MI_SINTERDICT)
mission_pln_sel(bombers, P_T | P_A, 0, hardtarget);
else
mission_pln_sel(bombers, P_T, P_A, SECT_HARDTARGET);
mission_pln_sel(&escorts, P_ESC | P_F, 0, SECT_HARDTARGET);
for (qp = bombers->q_forw; qp != bombers; qp = qp->q_forw) {
plp = (struct plist *)qp;
if (!find_airport(&airp, plp->plane.pln_x, plp->plane.pln_y))
add_airport(&airp, plp->plane.pln_x, plp->plane.pln_y);
}
performed = air_dam = 0;
for (qp = airp.q_forw; qp != (&airp); qp = qp->q_forw) {
struct airport *air;
char buf[1024];
air = (struct airport *)qp;
emp_initque(&b);
emp_initque(&e);
/* Split off the bombers at this base into b */
divide(bombers, &b, air->x, air->y);
/* Split off the escorts at this base into e */
divide(&escorts, &e, air->x, air->y);
if (path_find(air->x, air->y, x, y, plane_owner, MOB_FLY) < 0)
continue;
md = path_find_route(buf, sizeof(buf), air->x, air->y, x, y);
if (md >= sizeof(buf))
continue;
mission_pln_arm(&b, air->x, air->y, 2 * md, 'p', NULL);
if (QEMPTY(&b))
continue;
mission_pln_arm(&e, air->x, air->y, 2 * md, 'e', NULL);
performed = 1;
wu(0, plane_owner, "Flying %s mission from %s to %s\n",
mission_name(mission),
xyas(air->x, air->y, plane_owner),
xyas(x, y, plane_owner));
if (air->own && (air->own != plane_owner)) {
wu(0, air->own, "%s is flying %s mission from %s to %s\n",
cname(plane_owner), mission_name(mission),
xyas(air->x, air->y, air->own),
xyas(x, y, air->own));
}
ac_encounter(&b, &e, air->x, air->y, buf, 0);
if (!QEMPTY(&b))
air_dam +=
air_damage(&b, x, y, mission, victim, s, hardtarget);
pln_put(&b);
pln_put(&e);
}
if (air_dam > 0) {
if (targeting_ships)
nreport(plane_owner, N_SHP_BOMB, victim, 1);
else
nreport(plane_owner, N_SCT_BOMB, victim, 1);
}
qp = escorts.q_forw;
while (qp != (&escorts)) {
newqp = qp->q_forw;
emp_remque(qp);
free(qp);
qp = newqp;
}
qp = bombers->q_forw;
while (qp != bombers) {
newqp = qp->q_forw;
emp_remque(qp);
free(qp);
qp = newqp;
}
return performed ? tally_dam(dam, air_dam) : dam;
}
int
cando(int mission, int type)
{
switch (mission) {
case MI_ESCORT:
if (type == EF_PLANE)
return 1;
return 0;
case MI_AIR_DEFENSE:
if (type == EF_PLANE)
return 1;
return 0;
case MI_SINTERDICT:
if ((type == EF_PLANE) || (type == EF_SHIP))
return 1;
return 0;
case MI_INTERDICT:
return 1;
case MI_SUPPORT:
case MI_OSUPPORT:
case MI_DSUPPORT:
if (type == EF_PLANE)
return 1;
return 0;
case MI_RESERVE:
if (type == EF_LAND)
return 1;
return 0;
}
return 0;
}
char *
mission_name(int mission)
{
switch (mission) {
case MI_INTERDICT:
return "an interdiction";
case MI_SUPPORT:
return "a support";
case MI_OSUPPORT:
return "an offensive support";
case MI_DSUPPORT:
return "a defensive support";
case MI_RESERVE:
return "a reserve";
case MI_ESCORT:
return "an escort";
case MI_SINTERDICT:
return "a sub interdiction";
case MI_AIR_DEFENSE:
return "an air defense";
}
CANT_REACH();
return "a mysterious";
}
/*
* Maximum distance GP can perform its mission.
* Note: this has nothing to do with the radius of the op-area.
* oprange() governs where the unit *can* strike, the op-area governs
* where the player wants it to strike.
*/
int
oprange(struct empobj *gp)
{
switch (gp->ef_type) {
case EF_SHIP:
return ldround(shp_fire_range((struct shpstr *)gp), 1);
case EF_LAND:
if (gp->mission == MI_RESERVE)
return lnd_reaction_range((struct lndstr *)gp);
return ldround(lnd_fire_range((struct lndstr *)gp), 1);
case EF_PLANE:
/* missiles go one way, so we can use all the range */
if (plchr[(int)gp->type].pl_flags & P_M)
return ((struct plnstr *)gp)->pln_range;
return ((struct plnstr *)gp)->pln_range / 2;
}
CANT_REACH();
return -1;
}
/*
* Does GP's mission op area cover X,Y?
*/
int
in_oparea(struct empobj *gp, coord x, coord y)
{
return mapdist(x, y, gp->opx, gp->opy) <= gp->radius
&& mapdist(x, y, gp->x, gp->y) <= oprange(gp);
}
/*
* Remove all planes who cannot go on
* the mission from the plane list.
*/
static void
mission_pln_sel(struct emp_qelem *list, int wantflags, int nowantflags,
int hardtarget)
{
struct emp_qelem *qp, *next;
struct plnstr *pp;
struct plchrstr *pcp;
struct plist *plp;
for (qp = list->q_forw; qp != list; qp = next) {
next = qp->q_forw;
plp = (struct plist *)qp;
pp = &plp->plane;
pcp = plp->pcp;
if (pp->pln_effic < 40) {
emp_remque(qp);
free(qp);
continue;
}
if (pp->pln_mobil < 1) {
emp_remque(qp);
free(qp);
continue;
}
if (opt_MARKET) {
if (ontradingblock(EF_PLANE, pp)) {
emp_remque(qp);
free(qp);
continue;
}
}
if (!pln_capable(pp, wantflags, nowantflags)) {
emp_remque(qp);
free(qp);
continue;
}
if (!pln_airbase_ok(pp, 0, 0)) {
emp_remque(qp);
free(qp);
continue;
}
if (pcp->pl_flags & P_A) {
if (!pct_chance(pln_identchance(pp, hardtarget, EF_SHIP))) {
emp_remque(qp);
free(qp);
continue;
}
}
putplane(pp->pln_uid, pp);
}
}
/*
* Arm only the planes at x,y
*/
static void
mission_pln_arm(struct emp_qelem *list, coord x, coord y, int dist,
int mission, struct ichrstr *ip)
{
struct emp_qelem *qp;
struct emp_qelem *next;
struct plist *plp;
struct plnstr *pp;
for (qp = list->q_forw; qp != list; qp = next) {
next = qp->q_forw;
plp = (struct plist *)qp;
pp = &plp->plane;
if (pp->pln_x != x)
continue;
if (pp->pln_y != y)
continue;
if (CANT_HAPPEN(pp->pln_flags & PLN_LAUNCHED)
|| mission_pln_equip(plp, ip, mission) < 0) {
emp_remque(qp);
free(qp);
continue;
}
pp->pln_flags |= PLN_LAUNCHED;
pp->pln_mobil -= pln_mobcost(dist, pp, mission);
putplane(pp->pln_uid, pp);
}
}
int
mission_pln_equip(struct plist *plp, struct ichrstr *ip, char mission)
{
struct plchrstr *pcp;
struct plnstr *pp;
int load, needed;
struct lndstr land;
struct shpstr ship;
struct sctstr sect;
i_type itype;
short *item;
pp = &plp->plane;
pcp = plp->pcp;
if (pp->pln_ship >= 0) {
getship(pp->pln_ship, &ship);
plp->pstage = ship.shp_pstage;
item = ship.shp_item;
} else if (pp->pln_land >= 0) {
getland(pp->pln_land, &land);
plp->pstage = land.lnd_pstage;
item = land.lnd_item;
} else {
getsect(pp->pln_x, pp->pln_y, &sect);
plp->pstage = sect.sct_pstage;
item = sect.sct_item;
}
if (pcp->pl_fuel > item[I_PETROL]) {
return -1;
}
item[I_PETROL] -= pcp->pl_fuel;
load = pln_load(pp);
itype = I_NONE;
switch (mission) {
case 'p': /* pinpoint bomb */
itype = I_SHELL;
break;
case 'i': /* missile interception */
if (load)
itype = I_SHELL;
break;
case 'e': /* escort */
case 0: /* plane interception */
load = 0;
break;
default:
CANT_REACH();
load = 0;
}
if (itype != I_NONE) {
needed = load / ichr[itype].i_lbs;
if (needed <= 0)
return -1;
if (CANT_HAPPEN(nuk_on_plane(pp) >= 0))
return -1;
if (itype == I_SHELL && item[itype] < needed) {
if (pp->pln_ship >= 0)
shp_supply(&ship, I_SHELL, needed);
else if (pp->pln_land >= 0)
lnd_supply(&land, I_SHELL, needed);
else
sct_supply(&sect, I_SHELL, needed);
}
if (item[itype] < needed)
return -1;
item[itype] -= needed;
plp->load = needed;
}
if (pp->pln_ship >= 0)
putship(ship.shp_uid, &ship);
else if (pp->pln_land >= 0)
putland(land.lnd_uid, &land);
else
putsect(&sect);
return 0;
}
/*
* Return 1 if this x,y pair is in the list
*/
static int
find_airport(struct emp_qelem *airp, coord x, coord y)
{
struct emp_qelem *qp;
struct airport *a;
for (qp = airp->q_forw; qp != airp; qp = qp->q_forw) {
a = (struct airport *)qp;
if ((a->x == x) && (a->y == y))
return 1;
}
return 0;
}
/* #*# This needs to be changed to include acc's -KHS */
static void
add_airport(struct emp_qelem *airp, coord x, coord y)
{
struct airport *a;
struct sctstr sect;
a = malloc(sizeof(struct airport));
a->x = x;
a->y = y;
getsect(x, y, &sect);
a->own = sect.sct_own;
emp_insque((struct emp_qelem *)a, airp);
}
/*
* Take all the planes in list 1 that
* are at x,y, and put them into list 2.
*/
static void
divide(struct emp_qelem *l1, struct emp_qelem *l2, coord x, coord y)
{
struct emp_qelem *qp, *next;
struct plist *plp;
for (qp = l1->q_forw; qp != l1; qp = next) {
next = qp->q_forw;
plp = (struct plist *)qp;
if (plp->plane.pln_x != x)
continue;
if (plp->plane.pln_y != y)
continue;
emp_remque(qp);
emp_insque(qp, l2);
}
}
static int
air_damage(struct emp_qelem *bombers, coord x, coord y, int mission,
natid victim, char *s, int hardtarget)
{
struct emp_qelem *qp;
struct plist *plp;
struct plnstr *pp;
int newdam, dam = 0;
int hitchance;
for (qp = bombers->q_forw; qp != bombers; qp = qp->q_forw) {
plp = (struct plist *)qp;
pp = &plp->plane;
if ((mission == MI_SINTERDICT) && !(plp->pcp->pl_flags & P_A))
continue;
if (!plp->load)
continue;
if (plp->pcp->pl_flags & P_A) {
if (!pct_chance(pln_identchance(pp, hardtarget, EF_SHIP))) {
wu(0, pp->pln_own,
"\t%s detects sub movement in %s\n",
prplane(pp), xyas(x, y, pp->pln_own));
continue;
}
if (relations_with(pp->pln_own, victim) > HOSTILE) {
wu(0, pp->pln_own,
"\t%s tracks %s %s at %s\n",
prplane(pp), cname(victim), s, xyas(x, y, pp->pln_own));
continue;
}
wu(0, pp->pln_own,
"\t%s depth-charging %s %s in %s\n",
prplane(pp), cname(victim), s, xyas(x, y, pp->pln_own));
} else {
wu(0, pp->pln_own,
"\t%s pinbombing %s %s in %s\n",
prplane(pp), cname(victim), s, xyas(x, y, pp->pln_own));
}
hitchance = pln_hitchance(pp, hardtarget, EF_SHIP);
if (nuk_on_plane(&plp->plane) >= 0)
hitchance = 100;
else if (hardtarget != SECT_HARDTARGET)
wu(0, pp->pln_own, "\t\t%d%% hitchance...", hitchance);
if (pct_chance(hitchance)) {
newdam = pln_damage(&plp->plane, 'p', 1);
wu(0, pp->pln_own,
"\t\thit %s %s for %d damage\n",
cname(victim), s, newdam);
dam += newdam;
} else {
newdam = pln_damage(&plp->plane, 'p', 0);
wu(0, pp->pln_own, "missed\n");
if (mission == MI_SINTERDICT) {
mpr(victim,
"RUMBLE... your sub in %s hears a depth-charge explode nearby\n",
xyas(x, y, victim));
} else if (*s == 's') {
mpr(victim, "SPLASH! Bombs miss your %s in %s\n",
s, xyas(x, y, victim));
} else {
mpr(victim, "SPLAT! Bombs miss your %s in %s\n",
s, xyas(x, y, victim));
}
/* Now, even though we missed, the bombs
land somewhere. */
collateral_damage(x, y, newdam);
}
/* use up missiles */
if (plp->pcp->pl_flags & P_M)
pp->pln_effic = 0;
}
return dam;
}
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