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empserver/src/lib/subs/plnsub.c
Markus Armbruster 612ec6257d Pilots and air cargo now spread the plague 
Planes flying one-way with crew or cargo spread plague from their old
base to their new base.  Planes dropping cargo spread plague from
their base to the drop's target sector.
2012-07-13 20:15:33 +02:00

1118 lines
28 KiB
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/*
* Empire - A multi-player, client/server Internet based war game.
* Copyright (C) 1986-2012, 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.
*
* ---
*
* plnsub.c: Plane subroutine stuff
*
* Known contributors to this file:
* Dave Pare, 1986
* Ken Stevens, 1995
* Steve McClure, 1998-2000
* Markus Armbruster, 2004-2012
*/
#include <config.h>
#include "empobj.h"
#include "file.h"
#include "item.h"
#include "land.h"
#include "map.h"
#include "misc.h"
#include "nat.h"
#include "nsc.h"
#include "nuke.h"
#include "optlist.h"
#include "plague.h"
#include "plane.h"
#include "player.h"
#include "prototypes.h"
#include "sect.h"
#include "ship.h"
#include "xy.h"
static int ship_can_carry(struct shpstr *, int, int, int, int);
static int inc_shp_nplane(struct plnstr *, int *, int *, int *);
/*
* Get planes and escorts argument.
* Read planes into *NI_BOMB, and (optional) escorts into *NI_ESC.
* If INPUT_BOMB is not empty, use it, else prompt for more input.
* Same for INPUT_ESC.
* If we got a plane argument, initialize *NI_BOMB and *NI_ESC, and
* return 0.
* Else return -1 (*NI_BOMB and *NI_ESC may be modified).
*/
int
get_planes(struct nstr_item *ni_bomb, struct nstr_item *ni_esc,
char *input_bomb, char *input_esc)
{
if (!snxtitem(ni_bomb, EF_PLANE, input_bomb, NULL))
return -1;
if (!snxtitem(ni_esc, EF_PLANE, input_esc, "escort(s)? ")) {
if (player->aborted)
return -1;
pr("No escorts...\n");
}
return 0;
}
/*
* Get assembly point argument.
* If INPUT is not empty, use it, else prompt for more input using PROMPT.
* If this yields a valid assembly point, read it into *AP_SECT and
* return AP_SECT.
* Else complain and return NULL.
* *AP_SECT and BUF[1024] may be modified in either case.
*/
struct sctstr *
get_assembly_point(char *input, struct sctstr *ap_sect, char *buf)
{
char *p;
coord x, y;
struct nstr_item ni;
struct shpstr ship;
p = getstarg(input, "assembly point? ", buf);
if (!p || *p == 0)
return NULL;
if (!sarg_xy(p, &x, &y) || !getsect(x, y, ap_sect))
return NULL;
/* over own or allied sector is fine */
if (relations_with(ap_sect->sct_own, player->cnum) == ALLIED)
return ap_sect;
/* over own or allied ship is fine */
snxtitem_xy(&ni, EF_SHIP, x, y);
while (nxtitem(&ni, &ship)) {
if (ship.shp_effic < SHIP_MINEFF || ship.shp_own == 0)
continue;
if (relations_with(ship.shp_own, player->cnum) == ALLIED)
return ap_sect;
}
pr("Assembly point not owned by you or an ally!\n");
return NULL;
}
/*
* Find out whether planes can fly one-way to X,Y.
* Offer the player any carriers there. If he chooses one, read it
* into TARGET->ship. Else read the target sector into TARGET->sect.
* If planes can land there, set required plane flags in *FLAGSP, and
* return 0. Else return -1.
*/
int
pln_where_to_land(coord x, coord y,
union empobj_storage *target, int *flagsp)
{
int nships;
int cno;
int fl;
char buf[1024];
char *p;
/* offer carriers */
nships = carriersatxy(x, y, player->cnum);
if (nships) {
for (;;) {
p = getstring("Carrier #? ", buf);
if (!p)
return -1;
if (!*p)
break;
cno = atoi(p);
if (!getship(cno, &target->ship)
|| (!player->owner
&& (relations_with(target->ship.shp_own, player->cnum)
!= ALLIED))) {
pr("Not yours\n");
continue;
}
if (target->ship.shp_x != x || target->ship.shp_y != y) {
pr("Ship #%d not in %s\n", cno, xyas(x, y, player->cnum));
continue;
}
fl = carrier_planes(&target->ship, 0);
if (fl == 0) {
pr("Can't land on %s.\n", prship(&target->ship));
continue;
}
/* clear to land on ship#CNO */
pr("landing on carrier %d\n", cno);
*flagsp |= fl;
return 0;
}
}
/* try to land at sector */
getsect(x, y, &target->sect);
if (relations_with(target->sect.sct_own, player->cnum) != ALLIED) {
pr("Nowhere to land at sector %s!\n", xyas(x, y, player->cnum));
return -1;
}
if (target->sect.sct_type == SCT_MOUNT) {
pr("Nowhere to land at sector %s!\n", xyas(x, y, player->cnum));
return -1;
}
/* clear to land at sector */
if (target->sect.sct_type != SCT_AIRPT || target->sect.sct_effic < 60)
*flagsp |= P_V;
return 0;
}
int
pln_can_land_on_carrier(struct emp_qelem *bomb_list,
struct emp_qelem *esc_list,
struct shpstr *sp)
{
int n, nch, nxl, nmsl;
struct emp_qelem *list, *qp;
struct plist *plp;
n = shp_nplane(sp, &nch, &nxl, &nmsl);
/* for both lists */
for (list = bomb_list;
list;
list = list == bomb_list ? esc_list : NULL) {
for (qp = list->q_forw; qp != list; qp = qp->q_forw) {
plp = (struct plist *)qp;
if (plp->plane.pln_ship == sp->shp_uid)
continue;
n++;
if (!inc_shp_nplane(&plp->plane, &nch, &nxl, &nmsl))
return 0;
}
}
return ship_can_carry(sp, n, nch, nxl, nmsl);
}
void
pln_newlanding(struct emp_qelem *list, coord tx, coord ty, int cno)
{
struct emp_qelem *qp;
struct plist *plp;
struct shpstr ship;
struct sctstr sect;
if (cno >= 0)
getship(cno, &ship);
for (qp = list->q_forw; qp != list; qp = qp->q_forw) {
plp = (struct plist *)qp;
if (cno >= 0) {
if (!could_be_on_ship(&plp->plane, &ship))
pr("\t%s cannot land on ship #%d! %s aborts!\n",
prplane(&plp->plane), cno, prplane(&plp->plane));
else if (!put_plane_on_ship(&plp->plane, &ship))
pr("\tNo room on ship #%d! %s aborts!\n",
cno, prplane(&plp->plane));
else {
if (plp->plane.pln_own != ship.shp_own) {
wu(0, ship.shp_own, "%s %s lands on your %s\n",
cname(player->cnum), prplane(&plp->plane),
prship(&ship));
}
if (plp->pcp->pl_crew && plp->pstage == PLG_INFECT
&& ship.shp_pstage == PLG_HEALTHY)
ship.shp_pstage = PLG_EXPOSED;
}
} else {
plp->plane.pln_x = tx;
plp->plane.pln_y = ty;
getsect(tx, ty, &sect);
if (plp->plane.pln_own != sect.sct_own) {
wu(0, sect.sct_own,
"%s %s lands at your sector %s\n",
cname(player->cnum),
prplane(&plp->plane), xyas(tx, ty, sect.sct_own));
}
if (plp->pcp->pl_crew && plp->pstage == PLG_INFECT
&& sect.sct_pstage == PLG_HEALTHY)
sect.sct_pstage = PLG_EXPOSED;
plp->plane.pln_ship = cno;
}
}
}
void
pln_dropoff(struct emp_qelem *list, struct ichrstr *ip, coord tx, coord ty,
int cno)
{
struct emp_qelem *qp;
struct plist *plp;
int amt;
struct sctstr sect;
struct shpstr ship;
int there;
int max;
int pstage;
if (!ip)
return;
if (cno < 0) {
getsect(tx, ty, &sect);
if (!sect.sct_own) {
if (sect.sct_type == SCT_WATER)
pr("Your %s sink like a rock!\n", ip->i_name);
else
pr("Your %s vanish without a trace.\n", ip->i_name);
return;
}
if (relations_with(sect.sct_own, player->cnum) != ALLIED) {
pr("You don't own %s! Cargo jettisoned...\n",
xyas(tx, ty, player->cnum));
return;
}
if (ip->i_uid == I_CIVIL && sect.sct_own != sect.sct_oldown) {
pr("%s is occupied. Your civilians suffer from identity crisis and die.\n",
xyas(tx, ty, player->cnum));
return;
}
there = sect.sct_item[ip->i_uid];
max = ITEM_MAX;
pstage = sect.sct_pstage;
} else {
getship(cno, &ship);
there = ship.shp_item[ip->i_uid];
max = mchr[ship.shp_type].m_item[ip->i_uid];
pstage = ship.shp_pstage;
}
amt = 0;
for (qp = list->q_forw; qp != list; qp = qp->q_forw) {
plp = (struct plist *)qp;
amt += plp->load;
if (plp->load
&& plp->pstage == PLG_INFECT && pstage == PLG_HEALTHY)
pstage = PLG_EXPOSED;
}
there += amt;
if (there > max) {
pr("%d excess %s discarded\n", there - max, ip->i_name);
amt -= there - max;
there = max;
}
pr("%d %s landed safely", amt, ip->i_name);
if (cno < 0) {
sect.sct_item[ip->i_uid] = there;
sect.sct_pstage = pstage;
if (sect.sct_own != player->cnum)
wu(0, sect.sct_own, "%s planes drop %d %s in %s\n",
cname(player->cnum), amt, ip->i_name,
xyas(tx, ty, sect.sct_own));
pr(" at %s\n", xyas(tx, ty, player->cnum));
putsect(&sect);
} else {
ship.shp_item[ip->i_uid] = there;
ship.shp_pstage = pstage;
if (ship.shp_own != player->cnum)
wu(0, ship.shp_own, "%s planes land %d %s on carrier %d\n",
cname(player->cnum), amt, ip->i_name, ship.shp_uid);
pr(" on carrier #%d\n", ship.shp_uid);
putship(ship.shp_uid, &ship);
}
}
void
pln_mine(struct emp_qelem *list, coord tx, coord ty)
{
struct emp_qelem *qp;
struct plist *plp;
int amt;
struct sctstr sect;
amt = 0;
for (qp = list->q_forw; qp != list; qp = qp->q_forw) {
plp = (struct plist *)qp;
amt += plp->load;
}
if (amt > 0) {
getsect(tx, ty, &sect);
if (sect.sct_type != SCT_WATER) {
pr("Your seamines have no effect here.\n");
return;
}
sect.sct_mines = MIN(sect.sct_mines + amt, MINES_MAX);
pr("%d mines laid in %s.\n", amt, xyas(tx, ty, player->cnum));
if (map_set(player->cnum, tx, ty, 'X', 0))
writemap(player->cnum);
putsect(&sect);
}
}
/*
* Has PP's type capabilities satisfying WANTFLAGS and NOWANTFLAGS?
* A plane type is capable unless
* - it lacks all of the P_B, P_T in WANTFLAGS, or
* - it lacks all of the P_F, P_ESC in WANTFLAGS, or
* - it lacks all of the P_E, P_L, P_K in WANTFLAGS, or
* - it lacks any of the other capabilities in WANTFLAGS, or
* - it has any of the capabilities in NOWANTFLAGS.
*/
int
pln_capable(struct plnstr *pp, int wantflags, int nowantflags)
{
int flags = plchr[(int)pp->pln_type].pl_flags;
if (wantflags & (P_B | P_T)) {
if ((flags & wantflags & (P_B | P_T)) == 0)
return 0;
wantflags &= ~(P_B | P_T);
}
if (wantflags & (P_F | P_ESC)) {
if ((flags & wantflags & (P_F | P_ESC)) == 0)
return 0;
wantflags &= ~(P_F | P_ESC);
}
if (wantflags & (P_E | P_L | P_K)) {
if ((flags & wantflags & (P_E | P_L | P_K)) == 0)
return 0;
wantflags &= ~(P_E | P_L | P_K);
}
if ((flags & wantflags) != wantflags)
return 0;
if (flags & nowantflags)
return 0;
return 1;
}
/*
* Return union of capabilities of planes in LIST.
*/
int
pln_caps(struct emp_qelem *list)
{
struct emp_qelem *qp;
struct plist *plp;
int fl;
fl = 0;
for (qp = list->q_forw; qp != list; qp = qp->q_forw) {
plp = (struct plist *)qp;
fl |= plp->pcp->pl_flags;
}
return fl;
}
/*
* Find plane types that can operate from carrier SP.
* If MSL find missile types, else non-missile types.
* Return a combination of P_L, P_K, P_E.
* It's zero if SP can't support air operations due to its type or
* state (low efficiency).
*/
int
carrier_planes(struct shpstr *sp, int msl)
{
struct mchrstr *mcp = mchr + sp->shp_type;
int res;
if (sp->shp_effic < SHP_AIROPS_EFF)
return 0;
res = 0;
if (mcp->m_flags & M_FLY)
res |= P_L;
if ((mcp->m_flags & M_MSL) && msl)
res |= P_L;
if (mcp->m_nchoppers && !msl)
res |= P_K;
if (mcp->m_nxlight)
res |= P_E;
return res;
}
int
pln_airbase_ok(struct plnstr *pp, int oneway, int noisy)
{
struct shpstr ship;
struct lndstr land;
struct sctstr sect;
struct plchrstr *pcp = plchr + pp->pln_type;
if (CANT_HAPPEN(noisy && pp->pln_own != player->cnum))
noisy = 0;
if (pp->pln_ship >= 0) {
/* ship: needs to be own or allied, efficient */
if (!getship(pp->pln_ship, &ship)) {
CANT_REACH();
return 0;
}
if (relations_with(ship.shp_own, pp->pln_own) != ALLIED) {
if (noisy)
pr("(note) An ally does not own the ship %s is on\n",
prplane(pp));
return 0;
}
if (!(carrier_planes(&ship, pcp->pl_flags & P_M) & pcp->pl_flags))
return 0;
} else if (pp->pln_land >= 0) {
/* land: needs to be own or allied, efficient, not embarked */
if (!getland(pp->pln_land, &land)) {
CANT_REACH();
return 0;
}
if (relations_with(land.lnd_own, pp->pln_own) != ALLIED) {
if (noisy)
pr("(note) An ally does not own the unit %s is on\n",
prplane(pp));
return 0;
}
if (land.lnd_effic < LND_AIROPS_EFF || !(pcp->pl_flags & P_E))
return 0;
if (land.lnd_ship >= 0 || land.lnd_land >= 0)
return 0;
} else {
/* sector: needs to be own or allied, efficient airfield */
if (!getsect(pp->pln_x, pp->pln_y, &sect)) {
CANT_REACH();
return 0;
}
if (relations_with(sect.sct_own, pp->pln_own) != ALLIED) {
if (noisy)
pr("(note) An ally does not own the sector %s is in\n",
prplane(pp));
return 0;
}
/* need airfield unless VTOL */
if ((pcp->pl_flags & P_V) == 0) {
if (sect.sct_type != SCT_AIRPT) {
if (noisy)
pr("%s not at airport\n", prplane(pp));
return 0;
}
if (sect.sct_effic < 40) {
if (noisy)
pr("%s is not 40%% efficient, %s can't take off from there.\n",
xyas(sect.sct_x, sect.sct_y, player->cnum),
prplane(pp));
return 0;
}
if (!oneway && sect.sct_effic < 60) {
if (noisy)
pr("%s is not 60%% efficient, %s can't land there.\n",
xyas(sect.sct_x, sect.sct_y, player->cnum),
prplane(pp));
return 0;
}
}
}
return 1;
}
void
pln_sel(struct nstr_item *ni, struct emp_qelem *list, struct sctstr *ap,
int ap_to_target, int rangemult, int wantflags, int nowantflags)
{
struct plnstr plane;
int range;
struct plchrstr *pcp;
struct plist *plp;
emp_initque(list);
while (nxtitem(ni, &plane)) {
/*
* It would be nice to let deities fly foreign planes, but
* much of the code assumes that only the plane's owner can
* fly it.
*/
if (!plane.pln_own || plane.pln_own != player->cnum)
continue;
if (plane.pln_mobil <= 0)
continue;
if (plane.pln_effic < 40) {
pr("%s not efficient enough (must be 40%%)\n",
prplane(&plane));
continue;
}
if (!pln_capable(&plane, wantflags, nowantflags))
continue;
if (opt_MARKET) {
if (ontradingblock(EF_PLANE, &plane)) {
pr("plane #%d inelligible - it's for sale.\n",
plane.pln_uid);
continue;
}
}
range = mapdist(plane.pln_x, plane.pln_y, ap->sct_x, ap->sct_y);
if (range > 4) {
pr("%s too far from assembly point\n", prplane(&plane));
continue;
}
range += ap_to_target;
range *= rangemult;
pcp = &plchr[(int)plane.pln_type];
if (plane.pln_range < range) {
pr("%s out of range (%d:%d)\n",
prplane(&plane), plane.pln_range, range);
continue;
}
if (!pln_airbase_ok(&plane, rangemult != 2, 1))
continue;
pr("%s standing by\n", prplane(&plane));
plane.pln_mission = 0;
putplane(plane.pln_uid, &plane);
plp = malloc(sizeof(struct plist));
plp->load = 0;
plp->pstage = PLG_HEALTHY;
plp->pcp = pcp;
plp->plane = plane;
emp_insque(&plp->queue, list);
}
}
void
pln_arm(struct emp_qelem *list, int dist, char 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;
getplane(pp->pln_uid, pp);
if ((pp->pln_flags & PLN_LAUNCHED)
|| 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);
pr("%s equipped\n", prplane(pp));
}
}
int
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;
int own;
int abandon_needed;
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;
own = ship.shp_own;
} else if (pp->pln_land >= 0) {
getland(pp->pln_land, &land);
plp->pstage = land.lnd_pstage;
item = land.lnd_item;
own = land.lnd_own;
} else {
getsect(pp->pln_x, pp->pln_y, &sect);
plp->pstage = sect.sct_pstage;
item = sect.sct_item;
own = sect.sct_oldown;
}
if (pcp->pl_fuel > item[I_PETROL]) {
pr("%s not enough petrol there!\n", prplane(pp));
return -1;
}
item[I_PETROL] -= pcp->pl_fuel;
load = pln_load(pp);
itype = I_NONE;
switch (mission) {
case 's': /* strategic bomb */
case 'p': /* pinpoint bomb */
itype = I_SHELL;
break;
case 't': /* transport */
if (!(pcp->pl_flags & P_C) || !ip)
break;
itype = ip->i_uid;
load *= 2;
break;
case 'm': /* mine */
if ((pcp->pl_flags & P_MINE) == 0)
break;
itype = I_SHELL;
load *= 2;
break;
case 'd': /* drop */
if (!(pcp->pl_flags & P_C) || CANT_HAPPEN(!ip))
break;
itype = ip->i_uid;
if (pcp->pl_flags & P_V)
load *= 2;
break;
case 'a': /* paradrop */
if (!(pcp->pl_flags & P_P))
break;
itype = I_MILIT;
if (pcp->pl_flags & P_V)
load *= 2;
break;
case 'r': /* reconnaissance */
case 'e': /* escort */
load = 0;
break;
case 'i': /* missile interception */
if (CANT_HAPPEN(!(pcp->pl_flags & P_M)
|| !(pcp->pl_flags & (P_N | P_O))))
break;
if (load)
itype = I_SHELL;
break;
default:
CANT_REACH();
load = 0;
}
if (itype != I_NONE) {
needed = load / ichr[itype].i_lbs;
if (needed <= 0) {
pr("%s can't contribute to mission\n", prplane(pp));
return -1;
}
if (nuk_on_plane(pp) >= 0) {
if (mission == 's' || mission == 't')
needed = 0;
else {
pr("%s can't fly this mission"
" while it is carrying a nuclear weapon",
prplane(pp));
return -1;
}
}
if (itype == I_CIVIL && pp->pln_own != own) {
pr("You don't control those civilians!\n");
return -1;
}
#if 0
/* Supply is broken somewhere, so don't use it for now */
if (itype == I_SHELL && item[itype] < needed)
item[itype] += supply_commod(plp->plane.pln_own,
plp->plane.pln_x,
plp->plane.pln_y,
I_SHELL, needed);
#endif
if (pp->pln_ship >= 0 || pp->pln_land >= 0)
abandon_needed = 0;
else
abandon_needed = !!would_abandon(&sect, itype, needed, NULL);
if (item[itype] < needed + abandon_needed) {
pr("Not enough %s for %s\n", ichr[itype].i_name, prplane(pp));
return -1;
}
item[itype] -= needed;
plp->load = needed;
}
if (pp->pln_ship >= 0) {
if (pp->pln_own != ship.shp_own) {
wu(0, ship.shp_own,
"%s %s prepares for takeoff from ship %s\n",
cname(pp->pln_own), prplane(pp), prship(&ship));
}
putship(ship.shp_uid, &ship);
} else if (pp->pln_land >= 0) {
if (pp->pln_own != land.lnd_own) {
wu(0, land.lnd_own,
"%s %s prepares for takeoff from unit %s\n",
cname(pp->pln_own), prplane(pp), prland(&land));
}
putland(land.lnd_uid, &land);
} else {
if (pp->pln_own != sect.sct_own) {
wu(0, sect.sct_own, "%s %s prepares for takeoff from %s\n",
cname(pp->pln_own), prplane(pp),
xyas(sect.sct_x, sect.sct_y, sect.sct_own));
}
putsect(&sect);
}
return 0;
}
void
pln_put(struct emp_qelem *list)
{
struct emp_qelem *qp, *next;
for (qp = list->q_forw; qp != list; qp = next) {
next = qp->q_forw;
pln_put1((struct plist *)qp);
}
}
void
pln_put1(struct plist *plp)
{
struct plnstr *pp;
struct shpstr ship;
struct sctstr sect;
pp = &plp->plane;
if (CANT_HAPPEN((pp->pln_flags & PLN_LAUNCHED)
&& (plchr[pp->pln_type].pl_flags & P_M)
&& pp->pln_effic >= PLANE_MINEFF))
pp->pln_effic = 0; /* bug: missile launched but not used up */
if (!(pp->pln_flags & PLN_LAUNCHED))
; /* never took off */
else if (pp->pln_effic < PLANE_MINEFF) {
; /* destroyed */
} else if (pp->pln_ship >= 0) {
/* It is landing on a carrier */
getship(pp->pln_ship, &ship);
/* We should do more, like make sure it's really
a carrier, etc. but for now just make sure it's
not sunk. */
if (ship.shp_effic < SHIP_MINEFF) {
mpr(pp->pln_own,
"Ship #%d has been sunk, plane #%d has nowhere to land, and\n"
"splashes into the sea.\n",
pp->pln_ship, pp->pln_uid);
pp->pln_effic = 0;
}
} else {
/* Presume we are landing back in a sector. */
getsect(pp->pln_x, pp->pln_y, &sect);
if (sect.sct_type == SCT_WATER || sect.sct_type == SCT_WASTE) {
mpr(pp->pln_own,
"Nowhere to land at %s, plane #%d crashes and burns...\n",
xyas(pp->pln_x, pp->pln_y, pp->pln_own), pp->pln_uid);
pp->pln_effic = 0;
}
}
pp->pln_flags &= ~PLN_LAUNCHED;
putplane(pp->pln_uid, pp);
emp_remque(&plp->queue);
free(plp);
}
/*
* Can a carrier of SP's type carry this load of planes?
* The load consists of N planes, of which NCH are choppers, NXL
* xlight, NMSL light missiles, and the rest are light fixed-wing
* planes.
*/
static int
ship_can_carry(struct shpstr *sp, int n, int nch, int nxl, int nmsl)
{
struct mchrstr *mcp = &mchr[sp->shp_type];
int nfw = n - nch - nxl - nmsl;
if (nch > mcp->m_nchoppers) /* overflow into fixed-wing slots */
nfw += nch - mcp->m_nchoppers;
if (nxl > mcp->m_nxlight) /* overflow into missile slots */
nmsl += nxl - mcp->m_nxlight;
if (nmsl && !(mcp->m_flags & (M_MSL | M_FLY)))
return 0; /* missile slots wanted */
if (nfw && !(mcp->m_flags & M_FLY))
return 0; /* fixed-wing slots wanted */
return nfw + nmsl <= mcp->m_nplanes;
}
/*
* Increment carrier plane counters for PP.
* If it's a chopper, increment *NCH.
* Else, if it's x-light, increment *NXL.
* Else, if it's a light missile, increment *MSL.
* Return non-zero if it's a chopper, x-light or light.
*/
static int
inc_shp_nplane(struct plnstr *pp, int *nch, int *nxl, int *nmsl)
{
struct plchrstr *pcp = &plchr[pp->pln_type];
if (pcp->pl_flags & P_K)
(*nch)++;
else if (pcp->pl_flags & P_E)
(*nxl)++;
else if (!(pcp->pl_flags & P_L))
return 0;
else if (pcp->pl_flags & P_M)
(*nmsl)++;
return 1;
}
/*
* Can PP be loaded on a ship of SP's type?
*/
int
could_be_on_ship(struct plnstr *pp, struct shpstr *sp)
{
int nch = 0, nxl = 0, nmsl = 0;
if (!inc_shp_nplane(pp, &nch, &nxl, &nmsl))
return 0;
return ship_can_carry(sp, 1, nch, nxl, nmsl);
}
int
put_plane_on_ship(struct plnstr *plane, struct shpstr *ship)
{
int n, nch, nxl, nmsl;
if (plane->pln_ship == ship->shp_uid)
return 1; /* Already on ship */
n = shp_nplane(ship, &nch, &nxl, &nmsl);
if (!inc_shp_nplane(plane, &nch, &nxl, &nmsl))
return 0; /* not a carrier plane */
if (!ship_can_carry(ship, n + 1, nch, nxl, nmsl))
return 0; /* no space */
plane->pln_x = ship->shp_x;
plane->pln_y = ship->shp_y;
plane->pln_ship = ship->shp_uid;
putplane(plane->pln_uid, plane);
return 1;
}
int
put_plane_on_land(struct plnstr *plane, struct lndstr *land)
{
if (plane->pln_land == land->lnd_uid)
return 1; /* Already on unit */
if (!(plchr[plane->pln_type].pl_flags & P_E))
return 0;
if (lnd_nxlight(land) >= lchr[land->lnd_type].l_nxlight)
return 0;
plane->pln_x = land->lnd_x;
plane->pln_y = land->lnd_y;
plane->pln_land = land->lnd_uid;
putplane(plane->pln_uid, plane);
return 1;
}
void
plane_sweep(struct emp_qelem *plane_list, coord x, coord y)
{
struct plnstr *pp;
struct plchrstr *pcp;
struct emp_qelem *qp;
struct emp_qelem *next;
struct plist *ip;
struct sctstr sect;
int mines_there;
int found = 0;
getsect(x, y, &sect);
mines_there = sect.sct_mines;
if (mines_there == 0)
return;
if (sect.sct_type != SCT_WATER)
return;
for (qp = plane_list->q_forw; ((qp != plane_list) && (mines_there));
qp = next) {
next = qp->q_forw;
ip = (struct plist *)qp;
pp = &ip->plane;
pcp = ip->pcp;
if (!(pcp->pl_flags & P_SWEEP)) /* if it isn't an sweep plane */
continue;
if (chance((100.0 - pln_acc(pp)) / 100.0)) {
pr("Sweep! in %s\n",
xyas(sect.sct_x, sect.sct_y, player->cnum));
mines_there--;
found = 1;
}
}
if (found && map_set(player->cnum, sect.sct_x, sect.sct_y, 'X', 0))
writemap(player->cnum);
sect.sct_mines = mines_there;
putsect(&sect);
}
int
pln_hitchance(struct plnstr *pp, int hardtarget, int type)
{
struct plchrstr *pcp = plchr + pp->pln_type;
double tfact = (double)(pp->pln_tech - pcp->pl_tech) /
(pp->pln_tech - pcp->pl_tech / 2);
int acc = pln_acc(pp);
int hitchance;
if (type == EF_SHIP) {
if (pcp->pl_flags & P_A)
acc -= 20;
if (!(pcp->pl_flags & P_T))
acc += 35;
}
hitchance = (int)(pp->pln_effic * (1.0 - 0.1 * tfact) *
(1.0 - acc / 100.0)) - hardtarget;
/* smooth out the bottom of the graph with asymtote at 5 -KHS */
if (hitchance < 20)
hitchance = 5 + ldround(300.0 / (40.0 - hitchance), 1);
if (hitchance > 100)
hitchance = 100;
return hitchance;
}
int
pln_damage(struct plnstr *pp, char type, int noisy)
{
struct plchrstr *pcp = plchr + pp->pln_type;
int load, i, hitroll, aim, len;
int dam = 0;
int effective = 1;
int pinbomber = 0;
char buf[80];
if (CANT_HAPPEN(nuk_on_plane(pp) >= 0))
return 0;
load = pln_load(pp);
if (!load) /* e.g. ab, blowing up on launch pad */
return 0;
i = roll(load) + 1;
if (i > load)
i = load;
if (pcp->pl_flags & P_M) {
if (pcp->pl_flags & P_MAR)
pinbomber = 1;
} else if (pcp->pl_flags & P_T)
pinbomber = 1;
aim = pln_acc(pp);
if (type == 's') {
effective = !pinbomber;
aim = 30 + (pinbomber ? aim : 100 - aim);
} else {
effective = pinbomber;
aim = 100 - aim;
}
len = 0;
while (i--) {
dam += roll(6);
hitroll = roll(100);
if (hitroll >= 90) {
dam += 8;
if (noisy)
len += sprintf(buf + len, "BLAM");
} else if (hitroll < aim) {
dam += 5;
if (noisy)
len += sprintf(buf + len, "Blam");
} else {
dam += 1;
if (noisy)
len += sprintf(buf + len, "blam");
}
if (noisy) {
if (len > 75) {
mpr(pp->pln_own, "%s\n", buf);
len = 0;
}
if (i)
len += sprintf(buf + len, "-");
}
}
if (noisy && len)
mpr(pp->pln_own, "%s\n", buf);
if (effective)
dam *= 2;
return dam;
}
int
pln_identchance(struct plnstr *pp, int hardtarget, int type)
{
double misschance =
(100.0 - pln_hitchance(pp, hardtarget, type)) / 100.0;
return (int)(100 - 100 * misschance * misschance);
}
int
pln_mobcost(int dist, struct plnstr *pp, char mission)
{
double cost;
cost = 20.0 / (pp->pln_effic / 100.0);
if (mission == 'e' || mission == 0)
cost /= 2; /* escort or intercept */
return ldround(cost * dist / pln_range_max(pp) + 5, 1);
}
int
pln_is_in_orbit(struct plnstr *pp)
{
return (plchr[pp->pln_type].pl_flags & (P_M | P_O)) == P_O
&& (pp->pln_flags & PLN_LAUNCHED);
}
/*
* Set PP's tech to TLEV along with everything else that depends on it.
*/
void
pln_set_tech(struct plnstr *pp, int tlev)
{
struct plchrstr *pcp = plchr + pp->pln_type;
int limited_range = pp->pln_range < pln_range_max(pp);
int range_max;
if (CANT_HAPPEN(tlev < pcp->pl_tech))
tlev = pcp->pl_tech;
pp->pln_tech = tlev;
range_max = pln_range_max(pp);
if (!limited_range || pp->pln_range > range_max)
pp->pln_range = range_max;
}
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