load_land_ship() and load_land_land() fail for carriers that can't
carry any land units before prompting for land units to load. They
then iterate over land units to load, and fail when the carrrier has
no room. They either report "cannot carry land units" or "doesn't
have room for any more land units" then. The former cannot happen.
Crept into load_land_ship() in Empire 2, blindly copied to
load_land_land() in 4.0.0. load_plane_ship() and load_plane_land()
don't have this issue.
Drop the dead code.
Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
Attempting to unload land units from a carrier that can't carry any
prompts for land units to unload, while attempting to unload planes or
load land units or planes fails without prompting.
Fix this inconsistency by making unload and lunload fail early for
land units, just like they do for planes.
Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
load and lload skip foreign ships unless explicitly named, and
suppress some error messages for ships not explicitly named. Makes
sense, except the check for "explicitly named" is flawed: it checks
whether the argument starts with a digit. Works as intended for lists
like 1/2/3. Broken for areas that happen to start with a digit, such
as 0:9,0:5. Visible in the load-tend test.
Screwed up when the feature was added in Empire 2.
Fix the obvious way: test for NS_LIST instead. While there, drop the
p && *p guard, because it's always true after snxtitem().
Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
Unlike the move command, march checks sector abandonment before every
step.
If the player declines, the last land unit stays put and is removed
from the march.
Except when sectors or land units change while we're waiting for the
player's reply. Then the last unit is not removed from the march.
This can scatter land units. Screwed up when checking for abandoning
the sector was added in 4.2.2.
Change march to work like move, and to avoid scattering land units: if
the player declines to abandon the sector, the command simply fails.
Put the check into new lnd_abandon_askyn().
Extend would_abandon() and want_to_abandon() from a single land unit
to many. Rename the latter to abandon_askyn() for consistency.
Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
Spy units are now enabled when a land unit type with capability spy
exists. To disable them, deities have to customize table land-chr.
Before, spy units types were ignored when option LANDSPIES was
disabled. Except for xdump land-chr, which happily dumped unusable
spy unit types.
Why upgrade? I'm not a lawyer, but here's my take on the differences
to version 2:
* Software patents: better protection against abuse of patents to
prevent users from exercising the rights under the GPL. I doubt
we'll get hit with a patent suit, but it's a good move just on
general principles.
* License compatibility: compatible with more free licenses, i.e. can
"steal" more free software for use in Empire. I don't expect to steal
much, but it's nice to have the option.
* Definition of "source code": modernization of some details for today's
networked world, to make it easier to distribute the software. Not
really relevant to us now, as we normally distribute full source code.
* Tivoization: this is about putting GPL-licensed software in hardware,
then make the hardware refuse to run modified software. "Neat" trick
to effectively deny its users their rights under the GPL. Abuse was
"pioneered" by TiVo (popular digital video recorders). GPLv3 forbids
it. Unlikely to become a problem for us.
* Internationalization: more careful wording, to harden the license
outside the US. The lawyers tell us it better be done that way.
* License violations: friendlier way to deal with license violations.
This has come out of past experience enforcing the GPL.
* Additional permissions: Probably not relevant to us.
Also include myself in the list of principal authors.
Replacing getrel(getnatp(US), THEM) by relations_with(US, THEM) makes
a difference only when US equals THEM. Replace in places where it's
obvious that they're not equal.
Note: getsect() sets player->owner to "player is god or owns this
sector". Thus, after getsect(..., §), sect.sct_own ==
player->cnum implies player->owner. Conversely, !player->owner
implies sect.sct_own != player->cnum. Similarly for getship(),
getplane() and nxtitem().
Pinpointed assignments within if conditionals with spatch -sp_file
tests/bad_assign.cocci (from coccinelle-0.1.4). Cherry-picked diff
hunks affecting conditionals split over multiple lines, and cleaned
them up.
The automatic supply interface has design flaws that make it hard to
use correctly. Its current uses are in fact all wrong (until commit
0179fd86, the update had a few uses that might have been correct).
Some of the bugs can only bite with land unit capability combinations
that don't exist in the stock game, though.
Automatic supply draws supplies from supply sources in range. Since
that can update any supply source in range, all copies of potential
supply sources a caller may keep can get invalidated. Writing back
such an invalid copy wipes out the deduction of supplies and mobility
from a source, triggering a seqno mismatch oops.
This commit redesigns the interface so that callers can safely keep a
copy of the object drawing the supplies (the "supply sink"). The idea
is to pass the sink to the supply code, so it can avoid using it as
source. The actual avoiding will be implemented in a later commit.
Copies other than the supply sink still need to be eliminated. See
commit 65410d16 for an example.
Other improvements to help avoid common errors:
* Supply functions are commonly used to ensure the sink has a certain
amount of supplies. A common error is to fetch that amount
regardless of how many the sink already has. It's more convenient
for such users to pass how many they need to have instead of how
many to get.
* A common use of supply functions is to get supplies for immediate
use. If that use turns out not to be possible after all, the
supplies need to be added somewhere, which is all too easy to
forget. Many bugs of this kind have been fixed over time, and there
are still some left. This class of bugs can be avoided by adding
the supplies to the sink automatically.
In fact, this commit fixes precisely such bugs in mission_pln_equip()
and shp_missile_defense(): plane interception and support missions,
missile interception (abms), launch of ballistic missiles and
anti-sats could all lose shells, or supply more than needed.
Replace supply_commod() by new sct_supply(), shp_supply(),
lnd_supply(), and resupply_all() by new lnd_supply_all(). Simplify
users accordingly.
There's just one use of resupply_commod() left, in landmine(). Use
lnd_supply_all() there, and remove resupply_commod().
Being in supply is relevant for defending and reacting units. The
code used has_supply() to check that.
Contrary to its name, has_supply() does not check whether the land
unit has enough supplies to be in supply, but whether it has or could
draw enough. So, defending and reacting units did not actually draw
any missing supplies.
Fix that in get_dlist() and att_reacting_units() by calling
resupply_all(), then checking with new lnd_in_supply() instead of
has_supply(). The fix of att_reacting_units() is complicated by the
fact that it is also used in the strength command, and should keep not
drawing supplies there.
Rename has_supply() to lnd_could_be_supplied(). Replace its uses
immediately after resupply_all() by lnd_in_supply().
The Chainsaw 3 feature to let you load/unload to a specific amount
through a negative amount argument created loopholes: it let you load
your ships in friendly sectors with the unload command, and unload
friendly ships with the load command. Likewise for land units, with
allied instead of friendly, of course.
Empire 4.0.0 fixed that for the case of loading a land unit from an
allied sector. Get rid of that check, and fix it for good in
load_comm_ok().
The game generally doesn't let you give away civilians. But the check
in load_comm_ok() for that compared the sector old owner to the player
instead of the ship's or land unit's owner, which is incorrect for
foreign ships or land units. Fix that.
Also make fix the message there not to assume that the civilians are
owned by the player. This can't currently happen, but will when these
commands support use by deities properly.
This is for consistency with load and unload.
Before, you could use lunload for allied land units and lload in
allied sectors, but the command failed when stuff was loaded in allied
sectors. Doing that with lload no longer fails the command, because
the check that does that in load_comm_land() is now masked by the new
checks in lload(). Note that loading with lunload still fails the
command; that inconsistency will be removed in a later commit.
load_plane_land() already refused to load planes from foreign sectors.
This commit makes that check redundant, so remove it. Functional
change: lload now refuses to load foreign planes silently, unless both
land unit and plane were named by number. This is consistent with
load.
load and unload work on foreign ships only when their argument
explicitely names them, i.e. you have to ask for them by number. When
any other syntax is used, load() ignores foreign ships. This makes
sense. Change lload() to work just like that.
The check for ship owner's relations to the player was backward: it
checked the player's relations to the ship's owner instead. Abusable:
you could load and unload any ship by declaring friendly to its owner.
Broken since Chainsaw let you load and unload friendly ships.
The check for land unit owner's relations to the player was similarly
backward, similarly abusable, and also broken since day one.
lload and lunload checked sector owner's relations to the land unit's
owner instead of to the player. Harmless, because the two must be the
same to reach the check.
load_land_ship() and load_land_land() automatically resupply the land
units they load. This can draw supplies from the sector where the
land units are. When load() and lload() later update the sector, they
wipe out the update made for drawing supplies, and we get a seqno
mismatch oops. Highly abusable. Disable for now.
Use unit_give_away() in gift(). This fixes a number of bugs:
* Nukes on planes weren't given away along with the plane.
* Likewise for land units on land units (can't happen in the stock
game).
* Mission was not cleared by unload land/plane, lunload land/plane,
and lload plane, except for planes on land units.
* Wing and army were never cleared.
It also happens to suppress information on planes given away along
with their land unit carriers. Shrug.
Instead of counting the load with lnd_nland() / lnd_nxlight(), check
whether there's at least one loaded with lnd_first_on_land() /
pln_first_on_land().
