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empserver/src/lib/subs/shpsub.c
Markus Armbruster 79714720cc (ontradingblock, trdswitchown): Second parameter is a generic pointer, 
change it from int * to void *.  Callers changed not to cast to int *.
2006-03-25 15:11:17 +00:00

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/*
* Empire - A multi-player, client/server Internet based war game.
* Copyright (C) 1986-2006, 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.
*
* ---
*
* shpsub.c: Ship subroutine stuff
*
* Known contributors to this file:
* Ken Stevens, 1995
* Steve McClure, 1996-2000
*/
#include <config.h>
#include <math.h>
#include "misc.h"
#include "queue.h"
#include "player.h"
#include "sect.h"
#include "ship.h"
#include "plane.h"
#include "land.h"
#include "news.h"
#include "item.h"
#include "xy.h"
#include "nsc.h"
#include "file.h"
#include "nat.h"
#include "path.h"
#include "mission.h"
#include "optlist.h"
#include "damage.h"
#include "server.h"
#include "prototypes.h"
static int shp_check_one_mines(struct mlist *);
static int shp_hit_mine(struct shpstr *, struct mchrstr *);
static void shp_mess(s_char *, struct mlist *);
void
shp_sel(struct nstr_item *ni, struct emp_qelem *list)
/* int wantflags;
int nowantflags;
*/
{
struct shpstr ship;
struct mchrstr *mcp;
struct mlist *mlp;
emp_initque(list);
while (nxtitem(ni, &ship)) {
if (!player->owner)
continue;
mcp = &mchr[(int)ship.shp_type];
/* if (wantflags && (mcp->m_flags & wantflags) != wantflags)
continue;
if (nowantflags && mcp->m_flags & nowantflags)
continue;
*/
if (opt_MARKET) {
if (ontradingblock(EF_SHIP, &ship)) {
pr("ship #%d inelligible - it's for sale.\n",
ship.shp_uid);
continue;
}
}
/* This abuse is better fixed by building a ship with the normal negative
mobility that everything else is built with */
/*
if (opt_MOB_ACCESS) {
if (ship.shp_effic < 21 &&
ship.shp_mobil < etu_per_update) {
pr("%s needs at least %d mob to navigate.\n",
prship(&ship), etu_per_update);
continue;
}
}
*/
ship.shp_mission = 0;
ship.shp_rflags = 0;
memset(ship.shp_rpath, 0, sizeof(ship.shp_rpath));
putship(ship.shp_uid, &ship);
mlp = malloc(sizeof(struct mlist));
mlp->mcp = mcp;
mlp->ship = ship;
mlp->mobil = (double)ship.shp_mobil;
emp_insque(&mlp->queue, list);
}
}
/* This function assumes that the list was created by shp_sel */
void
shp_nav(struct emp_qelem *list, double *minmobp, double *maxmobp,
int *togetherp, natid actor)
{
struct emp_qelem *qp;
struct emp_qelem *next;
struct mlist *mlp;
struct sctstr sect;
struct shpstr ship;
coord allx;
coord ally;
int first = 1;
*minmobp = 9876.0;
*maxmobp = -9876.0;
*togetherp = 1;
for (qp = list->q_back; qp != list; qp = next) {
next = qp->q_back;
mlp = (struct mlist *)qp;
getship(mlp->ship.shp_uid, &ship);
if (ship.shp_own != actor) {
mpr(actor, "%s was sunk at %s\n",
prship(&ship), xyas(ship.shp_x, ship.shp_y, actor));
emp_remque((struct emp_qelem *)mlp);
free(mlp);
continue;
}
if (opt_SAIL) {
if (*ship.shp_path && !update_pending) {
shp_mess("has a sail path", mlp);
mpr(actor, "Use `sail <#> -' to reset\n");
continue;
}
}
/* check crew - uws don't count */
if (ship.shp_item[I_MILIT] == 0 && ship.shp_item[I_CIVIL] == 0) {
shp_mess("is crewless", mlp);
continue;
}
if (!getsect(ship.shp_x, ship.shp_y, &sect)) {
shp_mess("was sucked into the sky by a strange looking spaceship", mlp); /* heh -KHS */
continue;
}
switch (shp_check_nav(&sect, &ship)) {
case CN_CONSTRUCTION:
shp_mess("is caught in a construction zone", mlp);
continue;
case CN_LANDLOCKED:
shp_mess("is landlocked", mlp);
continue;
case CN_NAVIGABLE:
break;
case CN_ERROR:
default:
shp_mess("was just swallowed by a big green worm", mlp);
continue;
}
if (first) {
allx = ship.shp_x;
ally = ship.shp_y;
first = 0;
}
if (ship.shp_x != allx || ship.shp_y != ally)
*togetherp = 0;
if (ship.shp_mobil + 1 < (int)mlp->mobil) {
mlp->mobil = (double)ship.shp_mobil;
}
if (mlp->mobil < *minmobp)
*minmobp = mlp->mobil;
if (mlp->mobil > *maxmobp)
*maxmobp = mlp->mobil;
mlp->ship = ship;
}
}
void
shp_put(struct emp_qelem *list, natid actor)
{
struct emp_qelem *qp;
struct emp_qelem *newqp;
struct mlist *mlp;
qp = list->q_back;
while (qp != list) {
mlp = (struct mlist *)qp;
mpr(actor, "%s stopped at %s\n", prship(&mlp->ship),
xyas(mlp->ship.shp_x, mlp->ship.shp_y, mlp->ship.shp_own));
mlp->ship.shp_mobil = (int)mlp->mobil;
putship(mlp->ship.shp_uid, &mlp->ship);
newqp = qp->q_back;
emp_remque(qp);
free(qp);
qp = newqp;
}
}
int
shp_sweep(struct emp_qelem *ship_list, int verbose, natid actor)
{
struct emp_qelem *qp;
struct emp_qelem *next;
struct mlist *mlp;
struct sctstr sect;
int mines, m, max, shells;
int changed = 0;
int stopping = 0;
double mobcost;
for (qp = ship_list->q_back; qp != ship_list; qp = next) {
next = qp->q_back;
mlp = (struct mlist *)qp;
if (!(mlp->mcp->m_flags & M_SWEEP)) {
if (verbose)
mpr(actor, "%s doesn't have minesweeping capability!\n",
prship(&mlp->ship));
continue;
}
if (mlp->mobil <= 0.0) {
if (verbose)
mpr(actor, "%s is out of mobility!\n", prship(&mlp->ship));
continue;
}
getsect(mlp->ship.shp_x, mlp->ship.shp_y, &sect);
if (sect.sct_type != SCT_WATER) {
if (verbose)
mpr(actor, "%s is not at sea. No mines there!\n",
prship(&mlp->ship));
continue;
}
mobcost = mlp->ship.shp_effic * 0.01 * mlp->ship.shp_speed;
mobcost = 480.0 / (mobcost +
techfact(mlp->ship.shp_tech, mobcost));
mlp->mobil -= mobcost;
mlp->ship.shp_mobil = (int)mlp->mobil;
putship(mlp->ship.shp_uid, &mlp->ship);
if (!(mines = sect.sct_mines))
continue;
max = mlp->mcp->m_item[I_SHELL];
shells = mlp->ship.shp_item[I_SHELL];
for (m = 0; mines > 0 && m < 5; m++) {
if (chance(0.66)) {
mpr(actor, "Sweep...\n");
mines--;
shells = MIN(max, shells + 1);
changed |= map_set(actor, sect.sct_x, sect.sct_y, 'X', 0);
}
}
sect.sct_mines = mines;
mlp->ship.shp_item[I_SHELL] = shells;
if (shp_check_one_mines(mlp)) {
stopping = 1;
emp_remque(qp);
free(qp);
}
putship(mlp->ship.shp_uid, &mlp->ship);
putsect(&sect);
}
if (changed)
writemap(actor);
return stopping;
}
static int
shp_check_one_mines(struct mlist *mlp)
{
struct sctstr sect;
int changed = 0;
int actor;
getsect(mlp->ship.shp_x, mlp->ship.shp_y, &sect);
if (sect.sct_type != SCT_WATER)
return 0;
if (!sect.sct_mines)
return 0;
if (chance(DMINE_HITCHANCE(sect.sct_mines))) {
actor = mlp->ship.shp_own;
shp_hit_mine(&mlp->ship, mlp->mcp);
sect.sct_mines--;
changed |= map_set(actor, sect.sct_x, sect.sct_y, 'X', 0);
if (changed)
writemap(actor);
putsect(&sect);
putship(mlp->ship.shp_uid, &mlp->ship);
if (!mlp->ship.shp_own)
return 1;
}
return 0;
}
static int
shp_check_mines(struct emp_qelem *ship_list)
{
struct emp_qelem *qp;
struct emp_qelem *next;
struct mlist *mlp;
int stopping = 0;
for (qp = ship_list->q_back; qp != ship_list; qp = next) {
next = qp->q_back;
mlp = (struct mlist *)qp;
if (shp_check_one_mines(mlp)) {
stopping = 1;
emp_remque(qp);
free(qp);
}
}
return stopping;
}
void
shp_list(struct emp_qelem *ship_list)
{
struct emp_qelem *qp;
struct emp_qelem *next;
struct mlist *mlp;
struct shpstr *shp;
pr("shp# ship type x,y fl eff mil sh gun pn he xl ln mob tech\n");
for (qp = ship_list->q_back; qp != ship_list; qp = next) {
next = qp->q_back;
mlp = (struct mlist *)qp;
shp = &mlp->ship;
pr("%4d ", shp->shp_uid);
pr("%-16.16s ", mlp->mcp->m_name);
prxy("%4d,%-4d ", shp->shp_x, shp->shp_y, mlp->ship.shp_own);
pr("%c", shp->shp_fleet);
pr("%4d%%", shp->shp_effic);
pr("%4d", shp->shp_item[I_MILIT]);
pr("%4d", shp->shp_item[I_SHELL]);
pr("%4d", shp->shp_item[I_GUN]);
count_planes(shp);
pr("%3d", shp->shp_nplane);
pr("%3d", shp->shp_nchoppers);
pr("%3d", shp->shp_nxlight);
count_units(shp);
pr("%3d", shp->shp_nland);
pr("%4d", shp->shp_mobil);
pr("%4d\n", shp->shp_tech);
}
}
static void
shp_mess(s_char *str, struct mlist *mlp)
{
mpr(mlp->ship.shp_own, "%s %s & stays in %s\n",
prship(&mlp->ship),
str, xyas(mlp->ship.shp_x, mlp->ship.shp_y, mlp->ship.shp_own));
mlp->ship.shp_mobil = (int)mlp->mobil;
putship(mlp->ship.shp_uid, &mlp->ship);
emp_remque((struct emp_qelem *)mlp);
free(mlp);
}
int
shp_check_nav(struct sctstr *sect, struct shpstr *shp)
{
switch (dchr[sect->sct_type].d_nav) {
case NAVOK:
break;
case NAV_CANAL:
if (mchr[(int)shp->shp_type].m_flags & M_CANAL) {
if (sect->sct_effic < 2)
return CN_CONSTRUCTION;
} else
return CN_LANDLOCKED;
break;
case NAV_02:
if (sect->sct_effic < 2)
return CN_CONSTRUCTION;
break;
case NAV_60:
if (sect->sct_effic < 60)
return CN_CONSTRUCTION;
break;
default:
return CN_LANDLOCKED;
}
return CN_NAVIGABLE;
}
int
sect_has_dock(struct sctstr *sect)
{
switch (dchr[sect->sct_type].d_nav) {
case NAV_02:
return 1;
default:
return 0;
}
}
static int
shp_count(struct emp_qelem *list, int wantflags, int nowantflags, int x,
int y)
{
struct emp_qelem *qp;
struct emp_qelem *next;
struct mlist *mlp;
int count = 0;
for (qp = list->q_back; qp != list; qp = next) {
next = qp->q_back;
mlp = (struct mlist *)qp;
if (mlp->ship.shp_x != x || mlp->ship.shp_y != y)
continue;
if (wantflags && (mlp->mcp->m_flags & wantflags) != wantflags)
continue;
if (nowantflags && mlp->mcp->m_flags & nowantflags)
continue;
++count;
}
return count;
}
static void
shp_damage_one(struct mlist *mlp, int dam)
{
shipdamage(&mlp->ship, dam);
putship(mlp->ship.shp_uid, &mlp->ship);
if (!mlp->ship.shp_own) {
emp_remque((struct emp_qelem *)mlp);
free(mlp);
}
}
static int
shp_damage(struct emp_qelem *list, int totdam, int wantflags,
int nowantflags, int x, int y)
{
struct emp_qelem *qp;
struct emp_qelem *next;
struct mlist *mlp;
int dam;
int count;
if (!totdam
|| !(count = shp_count(list, wantflags, nowantflags, x, y)))
return 0;
dam = ldround(((double)totdam / (double)count), 1);
for (qp = list->q_back; qp != list; qp = next) {
next = qp->q_back;
mlp = (struct mlist *)qp;
if (mlp->ship.shp_x != x || mlp->ship.shp_y != y)
continue;
if (wantflags && (mlp->mcp->m_flags & wantflags) != wantflags)
continue;
if (nowantflags && mlp->mcp->m_flags & nowantflags)
continue;
shp_damage_one(mlp, dam);
}
return dam;
}
static int
shp_contains(struct emp_qelem *list, int newx, int newy, int wantflags,
int nowantflags)
{
struct emp_qelem *qp;
struct emp_qelem *next;
struct mlist *mlp;
for (qp = list->q_back; qp != list; qp = next) {
next = qp->q_back;
mlp = (struct mlist *)qp;
/* If the ship isn't in the requested sector, then continue */
if (newx != mlp->ship.shp_x || newy != mlp->ship.shp_y)
continue;
if (wantflags && (mlp->mcp->m_flags & wantflags) != wantflags)
continue;
if (nowantflags && mlp->mcp->m_flags & nowantflags)
continue;
return 1;
}
return 0;
}
static struct mlist *
most_valuable_ship(struct emp_qelem *list)
{
struct emp_qelem *qp;
struct emp_qelem *next;
struct mlist *mlp;
struct mlist *mvs = 0;
for (qp = list->q_back; qp != list; qp = next) {
next = qp->q_back;
mlp = (struct mlist *)qp;
if (mlp->mcp->m_flags & M_SUB)
continue;
if (!mlp->mcp->m_nxlight &&
!mlp->mcp->m_nchoppers &&
mlp->mcp->m_cost < 1000 &&
!mlp->mcp->m_nplanes && !mlp->mcp->m_nland)
continue;
if (!mvs) {
mvs = mlp;
continue;
}
if (mlp->mcp->m_cost * mlp->ship.shp_effic >
mvs->mcp->m_cost * mvs->ship.shp_effic)
mvs = mlp;
}
return mvs;
}
static int
shp_easiest_target(struct emp_qelem *list, int wantflags, int nowantflags)
{
struct emp_qelem *qp;
struct emp_qelem *next;
struct mlist *mlp;
int hard;
int easiest = 9876; /* things start great for victim */
int count = 0;
for (qp = list->q_back; qp != list; qp = next) {
next = qp->q_back;
mlp = (struct mlist *)qp;
if (wantflags && (mlp->mcp->m_flags & wantflags) != wantflags)
continue;
if (nowantflags && mlp->mcp->m_flags & nowantflags)
continue;
hard = shp_hardtarget(&mlp->ship);
if (hard < easiest)
easiest = hard; /* things get worse for victim */
++count;
}
return easiest - count;
}
static int
shp_missile_interdiction(struct emp_qelem *list, coord newx, coord newy,
natid victim)
{
int dam;
int twotries;
int stopping = 0;
struct emp_qelem msl_list, *qp, *newqp;
struct mlist *mvs;
s_char what[512];
msl_sel(&msl_list, newx, newy, victim, P_T | P_MAR, 0, MI_INTERDICT);
twotries = 0;
while (!QEMPTY(&msl_list) && (mvs = most_valuable_ship(list))) {
sprintf(what, "%s", prship(&mvs->ship));
dam = msl_launch_mindam(&msl_list, newx, newy,
shp_hardtarget(&mvs->ship),
EF_SHIP, 1, what, victim, MI_INTERDICT);
if (dam) {
mpr(victim,
"missile interdiction mission does %d damage to %s!\n",
dam, what);
shp_damage_one(mvs, dam);
twotries = 0;
stopping |= 1;
} else if (++twotries >= 2) {
break;
}
}
qp = msl_list.q_forw;
while (qp != msl_list.q_forw) {
newqp = qp->q_forw;
emp_remque(qp);
free(qp);
qp = newqp;
}
return stopping;
}
/* Note that this function has a side effect - it uses coastwatch
* ranges to see if it should fire upon a ship. So, this function
* is expected to return positive if a ship is in range, and 0 if a
* ship is not in range. */
static int
notify_coastguard(struct emp_qelem *list, int trange, struct sctstr *sectp)
{
struct emp_qelem *qp;
struct emp_qelem *next;
struct mlist *mlp;
struct natstr *natp;
int vrange;
natp = getnatp(sectp->sct_own);
vrange = sectp->sct_type == SCT_RADAR ? 14 : 4;
vrange *= tfact(sectp->sct_own, 1.0) * sectp->sct_effic / 100.0;
if (vrange < 1)
vrange = 1;
if (vrange < trange)
return 0;
for (qp = list->q_back; qp != list; qp = next) {
next = qp->q_back;
mlp = (struct mlist *)qp;
if (mlp->mcp->m_flags & M_SUB)
continue;
if (natp->nat_flags & NF_COASTWATCH)
wu(0, sectp->sct_own,
"%s %s sighted at %s\n",
cname(mlp->ship.shp_own),
prship(&mlp->ship),
xyas(mlp->ship.shp_x, mlp->ship.shp_y, sectp->sct_own));
if (opt_HIDDEN)
setcont(sectp->sct_own, mlp->ship.shp_own, FOUND_COAST);
}
return 1;
}
static int
shp_fort_interdiction(struct emp_qelem *list, coord newx, coord newy,
natid victim)
{
struct nstr_sect ns;
struct sctstr fsect;
int trange;
double range, range2, guneff;
int shell, gun;
int dam;
int totdam = 0;
s_char notified[MAXNOC];
int i;
/* Inform neutral and worse */
for (i = 0; i < MAXNOC; ++i) {
if (getrel(getnatp(i), victim) <= NEUTRAL)
notified[i] = 0;
else
notified[i] = 1;
}
snxtsct_dist(&ns, newx, newy, fort_max_interdiction_range);
while (nxtsct(&ns, &fsect)) {
if (!fsect.sct_own)
continue;
if (fsect.sct_own == victim)
continue;
if (notified[fsect.sct_own])
continue;
trange = mapdist(newx, newy, fsect.sct_x, fsect.sct_y);
if (notify_coastguard(list, trange, &fsect))
notified[fsect.sct_own] = 1;
}
if (opt_NO_FORT_FIRE)
return 0; /* Only coastwatch notify in nofortfire */
/* Only fire at Hostile ships */
for (i = 0; i < MAXNOC; ++i) {
if (getrel(getnatp(i), victim) >= NEUTRAL)
notified[i] = 0;
}
snxtsct_dist(&ns, newx, newy, fort_max_interdiction_range);
while (nxtsct(&ns, &fsect)) {
if (!notified[fsect.sct_own])
continue;
if (fsect.sct_type != SCT_FORTR)
continue;
gun = fsect.sct_item[I_GUN];
if (gun < 1)
continue;
range = tfactfire(fsect.sct_own, (double)MIN(gun, 7));
if (fsect.sct_effic > 59)
range++;
range2 = roundrange(range);
trange = mapdist(newx, newy, fsect.sct_x, fsect.sct_y);
if (trange > range2)
continue;
if (fsect.sct_item[I_MILIT] < 5)
continue;
shell = fsect.sct_item[I_SHELL];
if (shell < 1)
shell += supply_commod(fsect.sct_own,
fsect.sct_x, fsect.sct_y, I_SHELL, 1);
if (shell < 1)
continue;
shell--;
fsect.sct_item[I_SHELL] = shell;
putsect(&fsect);
if (gun > 7)
gun = 7;
guneff = landgun((int)fsect.sct_effic, gun);
dam = (int)guneff;
totdam += dam;
mpr(victim, "Incoming fire does %d damage!\n", dam);
/*
mpr(victim, "%s fires at you for %d!\n",
xyas(fsect.sct_x,fsect.sct_y,victim),
dam);
*/
wu(0, fsect.sct_own,
"%s fires at %s ships in %s for %d!\n",
xyas(fsect.sct_x, fsect.sct_y,
fsect.sct_own),
cname(victim), xyas(newx, newy, fsect.sct_own), dam);
nreport(fsect.sct_own, N_SHP_SHELL, victim, 1);
}
if (totdam > 0)
return shp_damage(list, totdam, 0, M_SUB, newx, newy);
return 0;
}
static int
shp_interdict(struct emp_qelem *list, coord newx, coord newy, natid victim)
{
int stopping = 0;
if (shp_contains(list, newx, newy, 0, M_SUB)) {
stopping |= shp_fort_interdiction(list, newx, newy, victim);
if (shp_contains(list, newx, newy, 0, M_SUB)) {
stopping |=
shp_damage(list,
unit_interdict(newx, newy, victim, "ships",
shp_easiest_target(list, 0, M_SUB),
MI_INTERDICT),
0, M_SUB, newx, newy);
if (most_valuable_ship(list)) {
stopping |=
shp_missile_interdiction(list, newx, newy, victim);
}
}
}
if (shp_contains(list, newx, newy, M_SUB, 0)) {
stopping |=
shp_damage(list,
unit_interdict(newx, newy, victim, "subs",
shp_easiest_target(list, M_SUB, 0),
MI_SINTERDICT),
M_SUB, 0, newx, newy);
}
return stopping;
}
/* high value of hardtarget is harder to hit */
int
shp_hardtarget(struct shpstr *sp)
{
struct sctstr sect;
int vis, onsea;
struct mchrstr *mcp = mchr + sp->shp_type;
vis = sp->shp_visib;
getsect(sp->shp_x, sp->shp_y, &sect);
onsea = (sect.sct_type == SCT_WATER);
if (mcp->m_flags & M_SUB)
vis *= 4;
return (int)(((double)sp->shp_effic / 100.0) *
(20 + (double)sp->shp_speed * onsea / 2.0 - vis));
}
static int
shp_hit_mine(struct shpstr *sp, struct mchrstr *mcp)
{
double m;
mpr(sp->shp_own, "Kawhomp! Mine detected in %s!\n",
xyas(sp->shp_x, sp->shp_y, sp->shp_own));
nreport(sp->shp_own, N_HIT_MINE, 0, 1);
m = 22.0 + (double)(random() % 21);
if (mcp->m_flags & M_SWEEP)
m /= 2.0;
shipdamage(sp, ldround(m, 1));
return (int)m;
}
void
shp_view(struct emp_qelem *list)
{
struct sctstr sect;
struct emp_qelem *qp;
struct emp_qelem *next;
struct mlist *mlp;
for (qp = list->q_back; qp != list; qp = next) {
next = qp->q_back;
mlp = (struct mlist *)qp;
getsect(mlp->ship.shp_x, mlp->ship.shp_y, &sect);
if (mlp->mcp->m_flags & M_FOOD)
mpr(mlp->ship.shp_own, "[fert:%d] ", sect.sct_fertil);
if (mlp->mcp->m_flags & M_OIL)
mpr(mlp->ship.shp_own, "[oil:%d] ", sect.sct_oil);
mpr(mlp->ship.shp_own, "%s @ %s %d%% %s\n",
prship(&mlp->ship),
xyas(mlp->ship.shp_x, mlp->ship.shp_y, player->cnum),
sect.sct_effic, dchr[sect.sct_type].d_name);
}
}
int
shp_nav_one_sector(struct emp_qelem *list, int dir, natid actor,
int together)
{
struct sctstr sect;
struct emp_qelem *qp;
struct emp_qelem *next;
struct mlist *mlp;
struct emp_qelem done;
coord dx;
coord dy;
coord newx;
coord newy;
int stopping = 0;
double mobcost;
double tech; /* for mapping */
double tf; /* for mapping */
s_char dp[80];
int navigate;
if (dir <= DIR_STOP || dir >= DIR_VIEW) {
shp_put(list, actor);
return 1;
}
dx = diroff[dir][0];
dy = diroff[dir][1];
for (qp = list->q_back; qp != list; qp = next) {
next = qp->q_back;
mlp = (struct mlist *)qp;
newx = xnorm(mlp->ship.shp_x + dx);
newy = ynorm(mlp->ship.shp_y + dy);
getsect(newx, newy, &sect);
navigate = shp_check_nav(&sect, &mlp->ship);
if (navigate != CN_NAVIGABLE ||
(sect.sct_own && actor != sect.sct_own &&
getrel(getnatp(sect.sct_own), actor) < FRIENDLY)) {
if (dchr[sect.sct_type].d_nav == NAV_CANAL &&
!(mlp->mcp->m_flags & M_CANAL) &&
navigate == CN_LANDLOCKED)
sprintf(dp,
"is too large to fit into the canal system at %s",
xyas(newx, newy, actor));
else
sprintf(dp, "can't go to %s", xyas(newx, newy, actor));
if (together) {
mpr(actor, "%s\n", dp);
return 2;
} else {
shp_mess(dp, mlp);
continue;
}
}
if (mlp->mobil <= 0.0) {
shp_mess("is out of mobility", mlp);
continue;
}
mobcost = mlp->ship.shp_effic * 0.01 * mlp->ship.shp_speed;
mobcost = 480.0 /
(mobcost + techfact(mlp->ship.shp_tech, mobcost));
mlp->ship.shp_x = newx;
mlp->ship.shp_y = newy;
if (mlp->mobil - mobcost < -127) {
mlp->mobil = -127;
} else {
mlp->mobil -= mobcost;
}
mlp->ship.shp_mobil = (int)mlp->mobil;
putship(mlp->ship.shp_uid, &mlp->ship);
/* Now update the map for this ship */
tech = techfact(mlp->ship.shp_tech, (double)mlp->mcp->m_vrnge);
if (mlp->mcp->m_flags & M_SONAR)
tf = techfact(mlp->ship.shp_tech, 1.0);
else
tf = 0.0;
radmapupd(mlp->ship.shp_own, mlp->ship.shp_x, mlp->ship.shp_y,
(int)mlp->ship.shp_effic, (int)tech, tf);
}
if (QEMPTY(list))
return stopping;
stopping |= shp_sweep(list, 0, actor);
if (QEMPTY(list))
return stopping;
stopping |= shp_check_mines(list);
if (QEMPTY(list))
return stopping;
/* interdict ships sector by sector */
emp_initque(&done);
while (!QEMPTY(list)) {
mlp = (struct mlist *)list->q_back;
newx = mlp->ship.shp_x;
newy = mlp->ship.shp_y;
stopping |= shp_interdict(list, newx, newy, actor);
/* move survivors in this sector to done */
for (qp = list->q_back; qp != list; qp = next) {
next = qp->q_back;
mlp = (struct mlist *)qp;
if (mlp->ship.shp_x == newx && mlp->ship.shp_y == newy) {
emp_remque(qp);
emp_insque(qp, &done);
}
}
}
/* assign surviving ships back to list */
emp_insque(list, &done);
emp_remque(&done);
return stopping;
}
/*
* shp_miss_defence
* Check for incoming missiles with a P_MAR flag.
* Return True=1 if the missile was shotdown.
* Or False=0
*
* Chad Zabel, July 95
*/
int
shp_missile_defense(coord dx, coord dy, natid bombown, int hardtarget)
{
struct nstr_item ni;
struct shpstr ship;
int hitchance;
int shell;
double gun, eff, teff;
snxtitem_dist(&ni, EF_SHIP, dx, dy, 1);
while (nxtitem(&ni, &ship)) {
if (!ship.shp_own)
continue;
if (!(mchr[(int)ship.shp_type].m_flags & M_ANTIMISSILE))
continue;
if (getrel(getnatp(ship.shp_own), bombown) >= NEUTRAL)
continue;
if (ship.shp_effic < 60)
continue;
shell = ship.shp_item[I_SHELL];
if (ship.shp_item[I_MILIT] < 1) /* do we have mil? */
continue;
if (shell < 2) { /* do we need shells */
shell += supply_commod(ship.shp_own, ship.shp_x, ship.shp_y,
I_SHELL, 2);
if (shell < 2)
continue;
}
if (ship.shp_item[I_GUN] < 1) /* we need at least 1 gun */
continue;
/* now calculate the odds */
gun = MIN(ship.shp_item[I_GUN], ship.shp_glim);
eff = (double)ship.shp_effic / 100.0;
teff =
(((double)ship.shp_tech) / (((double)ship.shp_tech) + 200.0));
/* raise 4.5 for better interception -KHS */
hitchance = (int)(gun * eff * teff * 4.5) - hardtarget;
if (hitchance < 0)
hitchance = 0;
if (hitchance > 100)
hitchance = 100;
mpr(bombown, "%s anti-missile system activated...",
cname(ship.shp_own));
mpr(ship.shp_own, "Ship #%i anti-missile system activated!\n",
ship.shp_uid);
mpr(ship.shp_own, "%d%% hitchance...", hitchance);
/* use ammo */
ship.shp_item[I_SHELL] = shell - 2;
putship(ship.shp_uid, &ship);
if (roll(100) <= hitchance) {
mpr(bombown, "KABOOOM!! Missile destroyed\n\n");
mpr(ship.shp_own,
"KABOOOM!! Incoming missile destroyed!\n\n");
return 1;
} else {
mpr(bombown, "SWOOSH!! anti-missile system failed!!\n");
mpr(ship.shp_own,
"SWOOSH!! Missile evades anti-missile systems\n\n");
}
}
return 0; /* all attempts failed */
}
s_char *
shp_path(int together, struct shpstr *shp, s_char *buf)
{
coord destx;
coord desty;
struct sctstr d_sect;
s_char *cp;
if (!sarg_xy(buf, &destx, &desty))
return 0;
if (!together) {
mpr(shp->shp_own,
"Cannot go to a destination sector if not all starting in the same sector\n");
return 0;
}
if (!getsect(destx, desty, &d_sect)) {
mpr(shp->shp_own, "%d,%d is not a sector\n", destx, desty);
return 0;
}
cp = BestShipPath(buf, shp->shp_x, shp->shp_y,
d_sect.sct_x, d_sect.sct_y, player->cnum);
if (!cp || shp->shp_mobil <= 0) {
mpr(shp->shp_own, "Can't get to '%s' right now.\n",
xyas(d_sect.sct_x, d_sect.sct_y, player->cnum));
return 0;
}
return cp;
}
/* Fire missiles at a ship which has fired shells */
void
shp_missdef(struct shpstr *sp, natid victim)
{
struct emp_qelem list;
struct mlist *mlp;
int eff;
s_char buf[512];
emp_initque(&list);
mlp = malloc(sizeof(struct mlist));
mlp->mcp = &mchr[(int)sp->shp_type];
mlp->ship = *sp;
mlp->mobil = (double)sp->shp_mobil;
emp_insque(&mlp->queue, &list);
sprintf(buf, "%s", prship(&mlp->ship));
eff = sp->shp_effic;
if (most_valuable_ship(&list)) {
shp_missile_interdiction(&list, sp->shp_x, sp->shp_y, sp->shp_own);
getship(sp->shp_uid, sp);
if (!sp->shp_own) {
wu(0, victim,
"missiles launched in defense did 100%% damage to %s\n",
buf);
wu(0, victim, "%s sunk!\n", buf);
} else if (eff > 0 && sp->shp_effic < eff) {
wu(0, victim,
"missiles launched in defense did %d%% damage to %s\n",
100 * (eff - sp->shp_effic) / eff, buf);
}
}
if (!QEMPTY(&list))
free(mlp);
}
/*
* Set SP's tech to TLEV along with everything else that depends on it.
*/
void
shp_set_tech(struct shpstr *sp, int tlev)
{
struct mchrstr *mcp = mchr + sp->shp_type;
int tech_diff = tlev - mcp->m_tech;
if (CANT_HAPPEN(tech_diff < 0)) {
tlev -= tech_diff;
tech_diff = 0;
}
sp->shp_tech = tlev;
sp->shp_armor = (short)SHP_DEF(mcp->m_armor, tech_diff);
sp->shp_speed = (short)SHP_SPD(mcp->m_speed, tech_diff);
sp->shp_visib = (short)SHP_VIS(mcp->m_visib, tech_diff);
sp->shp_frnge = (short)SHP_RNG(mcp->m_frnge, tech_diff);
sp->shp_glim = (short)SHP_FIR(mcp->m_glim, tech_diff);
}
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