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(s_commod): Clarify and comment the trickery required to make the

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recursion work.  By the way, resuppling from supply units in unit id
order is a greedy algorithm, which is quite inappropriate for the
problem.
This commit is contained in:
Markus Armbruster 2004-03-05 16:30:30 +00:00
parent e6ffdb71ee
commit d35085e5c4
1 changed files with 15 additions and 9 deletions
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24
src/lib/subs/supply.c
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@ -390,22 +390,28 @@ s_commod(int own, int x, int y, int type, int total_wanted,
if ((vec[type] - wanted) < get_minimum(&land, type)) { if ((vec[type] - wanted) < get_minimum(&land, type)) {
int hold; int hold;
struct lndstr l2; struct lndstr save;
l2 = land; /*
* Temporarily zap this unit's store, so the recursion
* avoids it.
*/
save = land;
hold = vec[type]; hold = vec[type];
vec[type] = 0; vec[type] = 0;
putvec(VT_ITEM, vec, (s_char *)&land, EF_LAND); putvec(VT_ITEM, vec, (s_char *)&land, EF_LAND);
land.lnd_fuel = 0; land.lnd_fuel = 0;
putland(land.lnd_uid, &land); putland(land.lnd_uid, &land);
hold +=
s_commod(own, land.lnd_x, land.lnd_y, type, wanted, hold += s_commod(own, land.lnd_x, land.lnd_y, type, wanted,
actually_doit); actually_doit);
vec[type] = hold; vec[type] = hold;
putvec(VT_ITEM, vec, (s_char *)&land, EF_LAND); if (actually_doit) {
putland(land.lnd_uid, &land); putvec(VT_ITEM, vec, (s_char *)&land, EF_LAND);
if (!actually_doit) putland(land.lnd_uid, &land);
putland(l2.lnd_uid, &l2); } else
putland(save.lnd_uid, &save);
} }
getvec(VT_ITEM, vec, (s_char *)&land, EF_LAND); getvec(VT_ITEM, vec, (s_char *)&land, EF_LAND);