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empserver/src/lib/subs/plnsub.c
Markus Armbruster 7bc63871c6 Fix bugs in tracking of planes flying a sortie 
Commit 7ca4f412 fixed tracking of planes flying a sortie by marking
them with flag PLN_LAUNCHED.  It failed to write SAMs and planes
flying missions back to the plane file, in sam_intercept() and
mission_pln_arm().  The only known problem with that is fairly
harmless: when the mission damages planes on the ground, the planes
flying it get damaged as if they were still sitting in their bases,
but the damage gets wiped out when they land.

The same issue applies to missiles.  So they need to be tracked as
well.  Do that in msl_hit().

While there, remove a few redundant PLN_LAUNCHED sanity checks.
2008-04-29 20:53:35 +02:00

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/*
* Empire - A multi-player, client/server Internet based war game.
* Copyright (C) 1986-2008, Dave Pare, Jeff Bailey, Thomas Ruschak,
* Ken Stevens, Steve McClure
*
* This program 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ---
*
* 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, 2004-2008
*/
#include <config.h>
#include "file.h"
#include "item.h"
#include "land.h"
#include "lost.h"
#include "map.h"
#include "misc.h"
#include "nat.h"
#include "nsc.h"
#include "nuke.h"
#include "optlist.h"
#include "path.h"
#include "plane.h"
#include "player.h"
#include "prototypes.h"
#include "sect.h"
#include "ship.h"
#include "xy.h"
static int pln_equip(struct plist *, struct ichrstr *, int, char);
static int fit_plane_on_ship(struct plnstr *, struct shpstr *);
/*
* 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 (ap_sect->sct_own == player->cnum
|| getrel(getnatp(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 (ship.shp_own == player->cnum
|| getrel(getnatp(ship.shp_own), player->cnum) == ALLIED)
return ap_sect;
}
pr("Assembly point not owned by you or an ally!\n");
return NULL;
}
int
pln_onewaymission(struct sctstr *target, int *shipno, int *flagp)
{
int nships;
int cno;
int flags, fl;
struct shpstr ship;
char buf[1024];
char *p;
flags = *flagp;
/* offer carriers */
nships = carriersatxy(target->sct_x, target->sct_y, player->cnum);
if (nships) {
for (;;) {
if (!(p = getstarg(0, "Carrier #? ", buf)) || !*p)
break;
cno = atoi(p);
if (cno < 0
|| !getship(cno, &ship)
|| (!player->owner
&& (getrel(getnatp(ship.shp_own), player->cnum)
!= ALLIED))) {
pr("Not yours\n");
continue;
}
if (ship.shp_x != target->sct_x || ship.shp_y != target->sct_y) {
pr("Ship #%d not in %s\n", cno,
xyas(target->sct_x, target->sct_y, player->cnum));
continue;
}
fl = carrier_planes(&ship, 0);
if (fl == 0) {
pr("Can't land on %s.\n", prship(&ship));
continue;
}
/* clear to land on ship#CNO */
pr("landing on carrier %d\n", cno);
flags |= fl;
*shipno = cno;
*flagp = flags;
return 0;
}
}
/* try to land at sector */
if (target->sct_own != player->cnum
&& getrel(getnatp(target->sct_own), player->cnum) != ALLIED) {
pr("Nowhere to land at sector %s!\n",
xyas(target->sct_x, target->sct_y, player->cnum));
return -1;
}
if (target->sct_type == SCT_MOUNT) {
pr("Nowhere to land at sector %s!\n",
xyas(target->sct_x, target->sct_y, player->cnum));
return -1;
}
if (target->sct_type != SCT_AIRPT || target->sct_effic < 60)
flags |= P_V;
/* clear to land at sector */
*shipno = -1;
*flagp = flags;
return 0;
}
int
pln_oneway_to_carrier_ok(struct emp_qelem *bomb_list,
struct emp_qelem *esc_list, int cno)
{
struct emp_qelem *list, *qp;
struct plist *plp;
struct shpstr ship;
if (cno < 0 || !getship(cno, &ship))
return 0;
count_planes(&ship);
/* 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 == ship.shp_uid)
continue;
if (!fit_plane_on_ship(&plp->plane, &ship))
return 0;
}
}
return 1;
}
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) {
count_planes(&ship);
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) {
/* 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));
}
}
} else {
plp->plane.pln_x = tx;
plp->plane.pln_y = ty;
getsect(tx, ty, &sect);
if (plp->plane.pln_own != sect.sct_own) {
/* 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));
}
plp->plane.pln_ship = cno;
}
}
if (cno >= 0)
putship(ship.shp_uid, &ship);
}
void
pln_dropoff(struct emp_qelem *list, struct ichrstr *ip, coord tx, coord ty,
void *ptr, int type)
{
struct emp_qelem *qp;
struct plist *plp;
int amt;
struct sctstr *sectp;
struct shpstr *sp;
int there;
int max;
struct mchrstr *mp;
if (ip == 0)
return;
amt = 0;
for (qp = list->q_forw; qp != list; qp = qp->q_forw) {
plp = (struct plist *)qp;
amt += plp->misc;
}
if (type == EF_SECTOR) {
sectp = ptr;
if (!sectp->sct_own) {
if (sectp->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 (sectp->sct_own != player->cnum
&& getrel(getnatp(sectp->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 && sectp->sct_own != sectp->sct_oldown) {
pr("%s is occupied. Your civilians suffer from identity crisis and die.\n",
xyas(tx, ty, player->cnum));
return;
}
there = sectp->sct_item[ip->i_uid];
max = ITEM_MAX;
} else {
sp = ptr;
there = sp->shp_item[ip->i_uid];
mp = &mchr[(int)sp->shp_type];
max = mp->m_item[ip->i_uid];
}
there += amt;
if (there > max) {
pr("%d excess %s discarded\n", max - there, ip->i_name);
amt = max - there;
there = max;
}
pr("%d %s landed safely", amt, ip->i_name);
if (type == EF_SECTOR) {
sectp = ptr;
sectp->sct_item[ip->i_uid] = there;
if (sectp->sct_own != player->cnum)
wu(0, sectp->sct_own, "%s planes drop %d %s in %s\n",
cname(player->cnum), amt, ip->i_name,
xyas(sectp->sct_x, sectp->sct_y, sectp->sct_own));
pr(" at %s\n", xyas(tx, ty, player->cnum));
putsect((struct sctstr *)ptr);
} else {
struct shpstr *sp = (struct shpstr *)ptr;
sp->shp_item[ip->i_uid] = there;
if (sp->shp_own != player->cnum)
wu(0, sp->shp_own, "%s planes land %d %s on carrier %d\n",
cname(player->cnum), amt, ip->i_name, sp->shp_uid);
pr(" on carrier #%d\n", sp->shp_uid);
putship(sp->shp_uid, sp);
}
}
void
pln_mine(struct emp_qelem *list, struct sctstr *sectp)
{
struct emp_qelem *qp;
struct plist *plp;
int amt;
amt = 0;
for (qp = list->q_forw; qp != list; qp = qp->q_forw) {
plp = (struct plist *)qp;
amt += plp->misc;
}
if (amt > 0) {
if (sectp->sct_type != SCT_WATER) {
pr("Your seamines have no effect here.\n");
return;
}
sectp->sct_mines = MIN(sectp->sct_mines + amt, MINES_MAX);
pr("%d mines laid in %s.\n", amt,
xyas(sectp->sct_x, sectp->sct_y, player->cnum));
if (map_set(player->cnum, sectp->sct_x, sectp->sct_y, 'X', 0))
writemap(player->cnum);
putsect(sectp);
}
}
/*
* Has PP's type capabilities satisfying WANTFLAGS and NOWANTFLAGS?
* A plane type is capable unless
* - 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_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;
}
/*
* 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 (ship.shp_own != pp->pln_own
&& getrel(getnatp(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 (land.lnd_own != pp->pln_own
&& getrel(getnatp(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 (sect.sct_own != pp->pln_own
&& getrel(getnatp(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, pp->pln_own),
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, pp->pln_own),
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)) {
if (!player->owner)
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->misc = 0;
plp->bombs = 0;
plp->pcp = pcp;
plp->plane = plane;
emp_insque(&plp->queue, list);
}
}
int
pln_arm(struct emp_qelem *list, int dist, char mission, struct ichrstr *ip,
int flags, int mission_flags)
{
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_flags & PLN_LAUNCHED)
|| pln_equip(plp, ip, flags, mission) < 0) {
emp_remque(qp);
free(qp);
continue;
}
if (flags & (P_S | P_I)) {
if (plp->pcp->pl_flags & P_S)
mission_flags |= P_S;
if (plp->pcp->pl_flags & P_I)
mission_flags |= P_I;
}
if (!(plp->pcp->pl_flags & P_H))
/* no stealth on this mission */
mission_flags &= ~P_H;
if (!(plp->pcp->pl_flags & P_X))
/* no stealth on this mission */
mission_flags &= ~P_X;
if (!(plp->pcp->pl_flags & P_A)) {
/* no asw on this mission */
mission_flags &= ~P_A;
/* FIXME escorts turn ASW patrol into ordinary recon */
}
if (!(plp->pcp->pl_flags & P_MINE)) {
/* no asw on this mission */
mission_flags &= ~P_MINE;
/* FIXME no effect */
}
pp->pln_flags |= PLN_LAUNCHED;
pp->pln_mobil -= pln_mobcost(dist, pp, flags);
putplane(pp->pln_uid, pp);
pr("%s equipped\n", prplane(pp));
}
return mission_flags;
}
static int
pln_equip(struct plist *plp, struct ichrstr *ip, int flags, 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);
item = ship.shp_item;
own = ship.shp_own;
} else if (pp->pln_land >= 0) {
getland(pp->pln_land, &land);
item = land.lnd_item;
own = land.lnd_own;
} else {
getsect(pp->pln_x, pp->pln_y, &sect);
item = sect.sct_item;
own = sect.sct_oldown;
}
if (ip) {
if (ip->i_uid == I_CIVIL) {
if (pp->pln_own != own) {
pr("You don't control those civilians!\n");
return -1;
}
}
}
if (pcp->pl_fuel > item[I_PETROL]) {
pr("%s not enough petrol there!\n", prplane(pp));
return -1;
}
item[I_PETROL] -= pcp->pl_fuel;
if ((flags & P_F) == 0) {
load = pln_load(pp);
itype = I_NONE;
needed = 0;
switch (mission) {
case 's': /* strategic bomb */
case 'p': /* pinpoint bomb */
if (pp->pln_nuketype == -1) {
itype = I_SHELL;
needed = load;
}
break;
case 't': /* transport */
case 'd': /* drop */
if ((pcp->pl_flags & P_C) == 0 || ip == 0)
break;
itype = ip->i_uid;
needed = (load * 2) / ip->i_lbs;
break;
case 'm': /* mine */
if ((pcp->pl_flags & P_MINE) == 0)
break;
itype = I_SHELL;
needed = (load * 2) / ip->i_lbs;
break;
case 'a': /* paradrop */
if ((pcp->pl_flags & (P_V | P_C)) == 0)
break;
itype = I_MILIT;
needed = load / ip->i_lbs;
break;
case 'r': /* reconnaissance */
break;
default:
CANT_REACH();
}
if (itype != I_NONE && needed <= 0) {
pr("%s can't contribute to mission\n", prplane(pp));
return -1;
}
if (itype != I_NONE) {
#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
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;
}
if (itype == I_SHELL && (mission == 's' || mission == 'p'))
plp->bombs = needed;
else
plp->misc = 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 lndstr land;
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 */
if (pp->pln_ship >= 0) {
getship(pp->pln_ship, &ship);
take_plane_off_ship(pp, &ship);
}
if (pp->pln_land >= 0) {
getland(pp->pln_land, &land);
take_plane_off_land(pp, &land);
}
} 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);
}
/*
* Fit a plane of PP's type on ship SP.
* Adjust SP's plane counters.
* Updating the plane accordingly is the caller's job.
* Return whether it fits.
*/
static int
fit_plane_on_ship(struct plnstr *pp, struct shpstr *sp)
{
struct plchrstr *pcp = plchr + pp->pln_type;
struct mchrstr *mcp = mchr + sp->shp_type;
int wanted;
if (pcp->pl_flags & P_K) {
/* chopper, try chopper slot first */
if (sp->shp_nchoppers < mcp->m_nchoppers)
return ++sp->shp_nchoppers;
/* else try plane slot */
wanted = M_FLY;
} else if (pcp->pl_flags & P_E) {
/* x-light, try x-light slot first */
if (sp->shp_nxlight < mcp->m_nxlight)
return ++sp->shp_nxlight;
/* else try plane slot */
wanted = M_MSL | M_FLY;
} else if (!(pcp->pl_flags & P_L)) {
/* not light, no go */
wanted = 0;
} else if (pcp->pl_flags & P_M) {
/* missile, use plane slot */
wanted = M_MSL | M_FLY;
} else {
/* fixed-wing plane, use plane slot */
wanted = M_FLY;
}
if ((mcp->m_flags & wanted) == 0)
return 0; /* ship not capable */
if (sp->shp_nplane < mcp->m_nplanes)
return ++sp->shp_nplane;
return 0;
}
/*
* Fit a plane of PP's type off ship SP.
* Adjust SP's plane counters, badly. You need to run count_planes()
* before the next fit_plane_on_ship().
* Updating the plane accordingly is the caller's job.
*/
static void
fit_plane_off_ship(struct plnstr *pp, struct shpstr *sp)
{
/*
* Frees chopper and nxlight slots first, which is why we need to
* run count_planes() before fit_plane_on_ship().
*/
struct plchrstr *pcp = plchr + pp->pln_type;
if (pcp->pl_flags & P_K) {
if (sp->shp_nchoppers) {
sp->shp_nchoppers--;
return;
}
} else if (pcp->pl_flags & P_E) {
if (sp->shp_nxlight) {
sp->shp_nxlight--;
return;
}
}
if (CANT_HAPPEN(sp->shp_nplane == 0))
sp->shp_nplane = 1;
sp->shp_nplane--;
}
int
put_plane_on_ship(struct plnstr *plane, struct shpstr *ship)
{
if (plane->pln_ship == ship->shp_uid)
return 1; /* Already on ship */
if (!fit_plane_on_ship(plane, ship))
return 0;
plane->pln_x = ship->shp_x;
plane->pln_y = ship->shp_y;
plane->pln_ship = ship->shp_uid;
putplane(plane->pln_uid, plane);
putship(ship->shp_uid, ship);
return 1;
}
void
take_plane_off_ship(struct plnstr *plane, struct shpstr *ship)
{
if (CANT_HAPPEN(plane->pln_ship != ship->shp_uid))
return;
fit_plane_off_ship(plane, ship);
plane->pln_ship = -1;
putship(ship->shp_uid, ship);
putplane(plane->pln_uid, plane);
}
/*
* Fit a plane of PP's type on land unit LP.
* Adjust LP's plane counters.
* Updating the plane accordingly is the caller's job.
* Return whether it fits.
*/
static int
fit_plane_on_land(struct plnstr *pp, struct lndstr *lp)
{
struct plchrstr *pcp = plchr + pp->pln_type;
struct lchrstr *lcp = lchr + lp->lnd_type;
if ((pcp->pl_flags & P_E) && lp->lnd_nxlight < lcp->l_nxlight)
return ++lp->lnd_nxlight;
return 0;
}
/*
* Fit a plane of PP's type off land unit LP.
* Adjust LP's plane counters.
* Updating the plane accordingly is the caller's job.
*/
static void
fit_plane_off_land(struct plnstr *pp, struct lndstr *lp)
{
if (CANT_HAPPEN(lp->lnd_nxlight == 0))
lp->lnd_nxlight = 1;
lp->lnd_nxlight--;
}
int
put_plane_on_land(struct plnstr *plane, struct lndstr *land)
{
if (plane->pln_land == land->lnd_uid)
return 1; /* Already on unit */
if (!fit_plane_on_land(plane, land))
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);
putland(land->lnd_uid, land);
return 1;
}
void
take_plane_off_land(struct plnstr *plane, struct lndstr *land)
{
if (CANT_HAPPEN(plane->pln_land != land->lnd_uid))
return;
fit_plane_off_land(plane, land);
plane->pln_land = -1;
putland(land->lnd_uid, land);
putplane(plane->pln_uid, plane);
}
/*
* Could a plane of PP's type be on on ship SP?
*/
int
could_be_on_ship(struct plnstr *pp, struct shpstr *sp)
{
struct shpstr ship;
ship = *sp;
ship.shp_nplane = ship.shp_nchoppers = ship.shp_nxlight = 0;
return fit_plane_on_ship(pp, &ship);
}
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) && (sect.sct_type != SCT_HARBR))
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, pp->pln_own));
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);
}
void
count_planes(struct shpstr *sp)
{
struct nstr_item ni;
struct plnstr plane;
int nplane, nchoppers, nxlight;
if (sp->shp_effic < SHIP_MINEFF)
return;
nplane = sp->shp_nplane;
sp->shp_nplane = 0;
nchoppers = sp->shp_nchoppers;
sp->shp_nchoppers = 0;
nxlight = sp->shp_nxlight;
sp->shp_nxlight = 0;
snxtitem_xy(&ni, EF_PLANE, sp->shp_x, sp->shp_y);
while (nxtitem(&ni, &plane)) {
if (plane.pln_own == 0)
continue;
if (plane.pln_ship == sp->shp_uid) {
if (!fit_plane_on_ship(&plane, sp))
CANT_REACH();
}
}
if (nplane != sp->shp_nplane ||
nxlight != sp->shp_nxlight || nchoppers != sp->shp_nchoppers) {
putship(sp->shp_uid, sp);
}
}
void
count_land_planes(struct lndstr *lp)
{
struct nstr_item ni;
struct plnstr plane;
int nplane;
if (lp->lnd_effic < LAND_MINEFF)
return;
nplane = lp->lnd_nxlight;
lp->lnd_nxlight = 0;
snxtitem_all(&ni, EF_PLANE);
while (nxtitem(&ni, &plane)) {
if (plane.pln_own == 0)
continue;
if (plane.pln_land == lp->lnd_uid)
if (!fit_plane_on_land(&plane, lp))
CANT_REACH();
}
if (lp->lnd_nxlight != nplane)
putland(lp->lnd_uid, lp);
}
int
count_sect_planes(struct sctstr *sp)
{
int count = 0;
struct nstr_item ni;
struct plnstr plane;
snxtitem_all(&ni, EF_PLANE);
while (nxtitem(&ni, &plane)) {
if (!plane.pln_own)
continue;
if (plane.pln_flags & PLN_LAUNCHED)
continue;
if (plane.pln_x == sp->sct_x && plane.pln_y == sp->sct_y)
++count;
}
return count;
}
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;
}
/* return 0 if there was a nuclear detonation */
int
pln_damage(struct plnstr *pp, coord x, coord y, char type, int *nukedamp,
int noisy)
{
struct nukstr nuke;
struct plchrstr *pcp = plchr + pp->pln_type;
int load, i;
int hitroll;
int dam = 0;
int aim;
int effective = 1;
int pinbomber = 0;
if (pp->pln_nuketype != -1) {
if (nuk_on_plane(&nuke, pp->pln_uid) >= 0) {
mpr(pp->pln_own, "Releasing RV's for %s detonation...\n",
pp->pln_flags & PLN_AIRBURST ? "airburst" : "groundburst");
pp->pln_nuketype = -1;
*nukedamp = detonate(&nuke, x, y,
pp->pln_flags & PLN_AIRBURST);
return 0;
}
CANT_REACH();
}
*nukedamp = 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;
}
while (i--) {
dam += roll(6);
hitroll = roll(100);
if (hitroll >= 90) {
dam += 8;
if (noisy)
mpr(pp->pln_own, "BLAM");
} else if (hitroll < aim) {
dam += 5;
if (noisy)
mpr(pp->pln_own, "Blam");
} else {
dam += 1;
if (noisy)
mpr(pp->pln_own, "blam");
}
if (i && noisy)
mpr(pp->pln_own, "-");
}
if (noisy)
mpr(pp->pln_own, "\n");
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, int flags)
{
double cost;
cost = 20.0 / (pp->pln_effic / 100.0);
if ((flags & P_F) || (flags & P_ESC))
cost /= 2;
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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