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empserver/src/lib/subs/plnsub.c
Markus Armbruster 8006543878 Distinguish between planes "in orbit" and "launched" 
Use new pln_is_in_orbit() when we want to test for orbit specifically,
and test PLN_LAUNCHED when we want to test whether the plane not
sitting in the sector (because it is flying).  This distinction is
pointless at this time, because the only way PLN_LAUNCHED gets set is
when a satellite goes into orbit.  It will become useful in a later
commit, which will use PLN_LAUNCHED to mark flying planes.
2008-03-26 22:09:09 +01:00

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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 (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;
}
if (plane.pln_effic < 40) {
pr("%s not efficient enough (must be 40%%)\n",
prplane(&plane));
continue;
}
range += ap_to_target;
range *= rangemult;
pcp = &plchr[(int)plane.pln_type];
if (!pln_capable(&plane, wantflags, nowantflags))
continue;
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;
for (qp = list->q_forw; qp != list; qp = next) {
next = qp->q_forw;
plp = (struct plist *)qp;
if (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 */
}
plp->plane.pln_mobil -= pln_mobcost(dist, &plp->plane, flags);
pr("%s equipped\n", prplane(&plp->plane));
}
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;
int rval;
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;
rval = 0;
if ((flags & P_F) == 0) {
load = pln_load(pp);
itype = I_NONE;
needed = 0;
switch (mission) {
case 's':
case 'p':
if (pp->pln_nuketype == -1) {
itype = I_SHELL;
needed = load;
}
break;
case 't':
case 'd':
if ((pcp->pl_flags & P_C) == 0 || ip == 0)
break;
itype = ip->i_uid;
needed = (load * 2) / ip->i_lbs;
break;
case 'm':
if ((pcp->pl_flags & P_MINE) == 0)
break;
itype = I_SHELL;
needed = (load * 2) / ip->i_lbs;
break;
case 'a':
if ((pcp->pl_flags & (P_V | P_C)) == 0)
break;
itype = I_MILIT;
needed = load / ip->i_lbs;
break;
case 'n':
if (pp->pln_nuketype == -1)
rval = -1;
break;
default:
break;
}
if (rval < 0 || (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 rval;
}
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 (!pp->pln_own) {
/* crashed */
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;
}
}
putplane(pp->pln_uid, pp);
emp_remque(&plp->queue);
free(plp);
}
void
pln_removedupes(struct emp_qelem *bomb_list, struct emp_qelem *esc_list)
{
struct emp_qelem *bomb;
struct emp_qelem *esc;
struct plist *bombp;
struct plist *escp;
if (QEMPTY(bomb_list) || QEMPTY(esc_list))
return;
bomb = bomb_list->q_forw;
while (bomb != bomb_list) {
if (QEMPTY(esc_list)) {
bomb = bomb_list;
continue;
}
esc = esc_list->q_forw;
bombp = (struct plist *)bomb;
while (esc != esc_list) {
escp = (struct plist *)esc;
if (escp->plane.pln_uid == bombp->plane.pln_uid) {
emp_remque(esc);
free(esc);
esc = esc_list;
} else
esc = esc->q_forw;
}
bomb = bomb->q_forw;
}
}
/*
* 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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