extern int sd(natid, natid, coord, coord, int, int, int);
extern int dd(natid, natid, coord, coord, int, int);
extern int shipdef(natid, natid, coord, coord);
+extern int feels_like_helping(natid, natid, natid);
/* getbit.c */
extern int emp_getbit(int, int, unsigned char *);
extern void emp_setbit(int, int, unsigned char *);
struct shpstr ship;
struct lndstr land;
struct nstr_item ni;
- int dam, dam2, rel, rel2;
+ int dam, dam2;
struct sctstr firing;
struct nstr_sect ns;
struct flist *fp;
dam = 0;
snxtitem_dist(&ni, EF_SHIP, ax, ay, 8);
while (nxtitem(&ni, &ship)) {
- if (ship.shp_own == 0)
+ if (!feels_like_helping(ship.shp_own, own, aown))
continue;
if ((mchr[ship.shp_type].m_flags & M_SUB) && type != EF_SHIP)
continue;
- rel = getrel(getnatp(ship.shp_own), own);
- rel2 = getrel(getnatp(ship.shp_own), aown);
- if ((ship.shp_own != own) && ((rel != ALLIED) || (rel2 != AT_WAR)))
- continue;
- /* Don't shoot yourself */
- if (ship.shp_own == aown)
- continue;
if (mchr[(int)ship.shp_type].m_flags & M_SUB) {
erange = torprange(&ship);
if (roundrange(erange) < ni.curdist)
}
snxtitem_dist(&ni, EF_LAND, ax, ay, 8);
while (nxtitem(&ni, &land)) {
- if (land.lnd_own == 0)
- continue;
- /* Don't shoot yourself */
- if (land.lnd_own == aown)
- continue;
-
- rel = getrel(getnatp(land.lnd_own), own);
- rel2 = getrel(getnatp(land.lnd_own), aown);
-
- if ((land.lnd_own != own) && ((rel != ALLIED) || (rel2 != AT_WAR)))
+ if (!feels_like_helping(land.lnd_own, own, aown))
continue;
erange = lnd_fire_range(&land);
if (!opt_NO_FORT_FIRE) {
snxtsct_dist(&ns, ax, ay, 8);
while (nxtsct(&ns, &firing)) {
- if (firing.sct_own == 0)
+ if (!feels_like_helping(firing.sct_own, own, aown))
continue;
- rel = getrel(getnatp(firing.sct_own), own);
- rel2 = getrel(getnatp(firing.sct_own), aown);
- if ((firing.sct_own != own) &&
- ((rel != ALLIED) || (rel2 != AT_WAR)))
- continue;
- /* Don't shoot yourself */
- if (firing.sct_own == aown)
- continue;
erange = fortrange(&firing);
if (roundrange(erange) < ns.curdist)
continue;
double eff;
struct shpstr ship;
struct nstr_item ni;
- int dam, rel, rel2;
+ int dam;
if (own == 0)
return 0;
eff = 1.0;
snxtitem_dist(&ni, EF_SHIP, x, y, 8);
while (nxtitem(&ni, &ship) && eff > 0.30) {
- if (ship.shp_own == att)
- continue;
- if (ship.shp_own == 0)
+ if (!feels_like_helping(ship.shp_own, own, att))
continue;
- rel = getrel(getnatp(ship.shp_own), own);
- rel2 = getrel(getnatp(ship.shp_own), att);
- if ((ship.shp_own != own) && ((rel != ALLIED) || (rel2 != AT_WAR)))
- continue;
if ((mchr[(int)ship.shp_type].m_flags & M_SUB) && !usesubs)
continue;
range = roundrange(shp_fire_range(&ship));
int
dd(natid att, natid def_own, coord ax, coord ay, int noisy, int defending)
{
- int dam, rel, rel2;
+ int dam;
struct sctstr firing;
struct nstr_sect ns;
dam = 0;
snxtsct_dist(&ns, ax, ay, 8);
while (nxtsct(&ns, &firing) && dam < 80) {
- if (firing.sct_own == att)
- continue;
- if (firing.sct_own == 0)
- continue;
- rel = getrel(getnatp(firing.sct_own), def_own);
- rel2 = getrel(getnatp(firing.sct_own), att);
- if (firing.sct_own != def_own && (rel != ALLIED || rel2 != AT_WAR))
+ if (!feels_like_helping(firing.sct_own, def_own, att))
continue;
/* XXX defdef damage is additive, but ship or land unit damage isn't */
dam += sb(att, def_own, &firing, ax, ay, noisy, defending);
return dam;
}
+/*
+ * Shall CN attempt to help FRIEND against FOE?
+ */
+int
+feels_like_helping(natid cn, natid friend, natid foe)
+{
+ if (cn == 0)
+ return 0; /* never helps anybody */
+ if (cn == foe)
+ return 0; /* don't help anybody against self */
+ if (cn == friend)
+ return 1; /* help self against anybody else */
+ /* third party helps ally if at war with foe: */
+ return getrel(getnatp(cn), friend) == ALLIED
+ && getrel(getnatp(cn), foe) == AT_WAR;
+}
+
/* Shoot back
*
* See if the sector being fired at will defend itself.