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Stop ship and land unit movement on interdiction with no damage

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Movement stops when shp_interdict() or lnd_interdict() report
interdiction.  However, they reported it only when there was
interdiction damage.

Zero interdiction damage commonly happens when interdicting missiles
miss, or all bombers abort.  Stopping regardless of damage makes more
sense there.

Moreover, not stopping is buggy: do_unit_move() needs to take care not
to wipe out updates made by interdiction to the moving ships or land
units.  It does so only when it stops.  Updates made by interdiction
without interdiction damage could get wiped out, triggering a seqno
mismatch oops.

Known ways moving ships and land units can get updated by interdiction
despite there is no interdiction damage:

* Interdicting bombers get intercepted by planes based on a navigating
  carrier, carrier gets charged petrol.  The bug wipes out the petrol
  use.

* Marching land units get interdicted by planes, but all planes miss.
  Sufficiently large collateral damage to the sector can still damage
  the land units.  The bug wipes out the damage to land units.

To make shp_interdict() and lnd_interdict() report interdiction
regardless of damage, change lnd_missile_interdiction(),
lnd_fort_interdiction(), lnd_mission_interdiction(),
shp_missile_interdiction(), shp_fort_interdiction(),
shp_mission_interdiction() to return whether there was interdiction.
Before, they returned whether there was damage.

Change unit_interdict(), perform_mission(), perform_mission_land(),
perform_mission_ship(), perform_mission_msl(), and
perform_mission_bomb() to return -1 for no interdiction, so that
callers can distinguish no interdiction from interdiction with no
damage.
This commit is contained in:
Markus Armbruster 2010-01-09 16:21:40 +01:00
parent 05b56fa942
commit 227854bca2
3 changed files with 62 additions and 45 deletions
Download patch file Download diff file Expand all files Collapse all files

63
src/lib/subs/mission.c
View file

@ -80,8 +80,14 @@ static int perform_mission_msl(int, struct emp_qelem *, coord, coord,
natid, int);
static int perform_mission_bomb(int, struct emp_qelem *, coord, coord,
natid, int, char *, int, int);
static int perform_mission(coord, coord, natid, struct emp_qelem *, int,
char *, int);
static int perform_mission(coord, coord, natid, struct emp_qelem *,
int, char *, int);
static int
tally_dam(int dam, int newdam)
{
return dam < 0 ? newdam : dam + newdam;
}
/*
* Interdict commodities & transported planes
@ -109,10 +115,11 @@ ground_interdict(coord x, coord y, natid victim, char *s)
newdam = perform_mission(x, y, victim, &mi[cn].queue,
MI_INTERDICT, s, SECT_HARDTARGET);
dam += newdam;
if (newdam)
if (newdam > 0) {
dam += newdam;
mpr(victim, "%s interdiction mission does %d damage!\n",
cname(cn), newdam);
}
}
if (dam) {
collateral_damage(x, y, dam);
@ -170,10 +177,9 @@ int
unit_interdict(coord x, coord y, natid victim, char *s, int hardtarget,
int mission)
{
int cn;
int dam = 0, newdam;
int cn, newdam, osubs;
int dam = -1;
struct genlist mi[MAXNOC];
int osubs;
memset(mi, 0, sizeof(mi));
for (cn = 1; cn < MAXNOC; cn++)
@ -196,17 +202,13 @@ unit_interdict(coord x, coord y, natid victim, char *s, int hardtarget,
osubs = only_subs(&mi[cn].queue);
newdam = perform_mission(x, y, victim, &mi[cn].queue,
mission, s, hardtarget);
dam += newdam;
if (newdam) {
/* If only subs responded, then we don't know who's
subs they are */
dam = tally_dam(dam, newdam);
if (newdam > 0)
mpr(victim, "%s interdiction mission does %d damage!\n",
osubs ? "Enemy" : cname(cn), newdam);
}
}
if (dam) {
if (dam > 0)
collateral_damage(x, y, dam);
}
return dam;
}
@ -256,7 +258,7 @@ static int
dosupport(struct genlist *mi, coord x, coord y, natid victim, natid actee)
{
int cn;
int rel;
int rel, newdam;
int dam = 0;
for (cn = 1; cn < MAXNOC; cn++) {
@ -270,8 +272,10 @@ dosupport(struct genlist *mi, coord x, coord y, natid victim, natid actee)
if (QEMPTY(&mi[cn].queue))
continue;
dam += perform_mission(x, y, victim, &mi[cn].queue, MI_SUPPORT,
"", SECT_HARDTARGET);
newdam = perform_mission(x, y, victim, &mi[cn].queue, MI_SUPPORT,
"", SECT_HARDTARGET);
if (newdam > 0)
dam += newdam;
}
return dam;
}
@ -383,7 +387,7 @@ perform_mission(coord x, coord y, natid victim, struct emp_qelem *list,
struct genlist *glp;
struct plist *plp;
struct plchrstr *pcp;
int dam = 0;
int dam = -1;
int targeting_ships = *s == 's'; /* "subs" or "ships" FIXME gross! */
emp_initque(&missiles);
@ -429,7 +433,6 @@ perform_mission(coord x, coord y, natid victim, struct emp_qelem *list,
dam = perform_mission_msl(dam, &missiles, x, y, victim, hardtarget);
dam = perform_mission_bomb(dam, &bombers, x, y, victim, mission, s,
hardtarget, targeting_ships);
return dam;
}
@ -472,7 +475,7 @@ perform_mission_land(int dam, struct lndstr *lp, coord x, coord y,
mpr(victim, "%s %s fires at you at %s\n",
cname(lp->lnd_own), prland(lp), xyas(x, y, victim));
return dam + dam2;
return tally_dam(dam, dam2);
}
static int
@ -531,7 +534,7 @@ perform_mission_ship(int dam, struct shpstr *sp, coord x, coord y,
mpr(victim,
"Incoming torpedo sighted @ %s missed (whew)!\n",
xyas(x, y, victim));
return dam;
return tally_dam(dam, 0);
}
wu(0, sp->shp_own, "\tBOOM!...\n");
nreport(victim, N_TORP_SHIP, 0, 1);
@ -565,24 +568,23 @@ perform_mission_ship(int dam, struct shpstr *sp, coord x, coord y,
cname(sp->shp_own), prship(sp), xyas(x, y, victim));
}
return dam + dam2;
return tally_dam(dam, dam2);
}
static int
perform_mission_msl(int dam, struct emp_qelem *missiles, coord x, coord y,
natid victim, int hardtarget)
{
int air_dam;
int performed, air_dam, sublaunch, dam2;
struct emp_qelem *qp, *newqp;
struct plist *plp;
int sublaunch, dam2;
/*
* Missiles, except for interdiction of ships or land units,
* because that happens elsewhere, in shp_missile_interdiction()
* and lnd_missile_interdiction().
*/
air_dam = 0;
performed = air_dam = 0;
for (qp = missiles->q_back; qp != missiles; qp = newqp) {
newqp = qp->q_back;
plp = (struct plist *)qp;
@ -594,6 +596,7 @@ perform_mission_msl(int dam, struct emp_qelem *missiles, coord x, coord y,
if (msl_launch(&plp->plane, EF_SECTOR, "sector", x, y, victim,
&sublaunch) < 0)
goto use_up_msl;
performed = 1;
if (!msl_hit(&plp->plane, SECT_HARDTARGET, EF_SECTOR,
N_SCT_MISS, N_SCT_SMISS, sublaunch, victim))
CANT_REACH();
@ -606,7 +609,8 @@ perform_mission_msl(int dam, struct emp_qelem *missiles, coord x, coord y,
emp_remque(qp);
free(qp);
}
return dam + air_dam;
return performed ? tally_dam(dam, air_dam) : dam;
}
static int
@ -616,7 +620,7 @@ perform_mission_bomb(int dam, struct emp_qelem *bombers, coord x, coord y,
{
struct emp_qelem *qp, *newqp, escorts, airp, b, e;
struct plist *plp;
int plane_owner, air_dam, md;
int plane_owner, performed, air_dam, md;
emp_initque(&escorts);
emp_initque(&airp);
@ -648,7 +652,7 @@ perform_mission_bomb(int dam, struct emp_qelem *bombers, coord x, coord y,
add_airport(&airp, plp->plane.pln_x, plp->plane.pln_y);
}
air_dam = 0;
performed = air_dam = 0;
for (qp = airp.q_forw; qp != (&airp); qp = qp->q_forw) {
struct airport *air;
char buf[512];
@ -676,6 +680,7 @@ perform_mission_bomb(int dam, struct emp_qelem *bombers, coord x, coord y,
pp = BestAirPath(buf, air->x, air->y, x, y);
if (CANT_HAPPEN(!pp))
continue;
performed = 1;
wu(0, plane_owner, "Flying %s mission from %s to %s\n",
mission_name(mission),
xyas(air->x, air->y, plane_owner),
@ -720,7 +725,7 @@ perform_mission_bomb(int dam, struct emp_qelem *bombers, coord x, coord y,
qp = newqp;
}
return dam + air_dam;
return performed ? tally_dam(dam, air_dam) : dam;
}
int