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location viability on Plane of Water

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While testing, I noticed that I could completely fill the Water level
with air elementals.

Hero can't fly or levitate or water walk into/onto water locations
on Water level without drowning/crawling out the water, and monsters
shouldn't have been able to but could, then they were hit by drowning
since minliquid used different criteria than movement.  But goodpos(),
used for teleport destination and new monster creation among other
things, consided water locations acceptable on that level for
non-aquadic creatures with Fly/Lev/Wwalk ability.

It explains why so many dragons and other 'nasty' monsters have been
ending up on the vanquished monsters list when hero uses level
teleport to go directly there from level 1.  They've either been
getting created in water and then they drown when it's their turn to
move or moving into it to approach the hero and drowning (not sure
whether that case is immediate or on next move).  There's no message
since hero doesn't see it, and air elementals didn't drown since thy
don't breathe.
This commit is contained in:
PatR
2019-06-05 04:16:34 -07:00
parent 43ae30443d
commit b982e6c526
4 changed files with 36 additions and 14 deletions
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22
src/teleport.c
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@@ -1,4 +1,4 @@
/* NetHack 3.6 teleport.c $NHDT-Date: 1559227830 2019/05/30 14:50:30 $ $NHDT-Branch: NetHack-3.6 $:$NHDT-Revision: 1.87 $ */
/* NetHack 3.6 teleport.c $NHDT-Date: 1559733391 2019/06/05 11:16:31 $ $NHDT-Branch: NetHack-3.6 $:$NHDT-Revision: 1.88 $ */
/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/*-Copyright (c) Robert Patrick Rankin, 2011. */
/* NetHack may be freely redistributed. See license for details. */
@@ -62,16 +62,26 @@ unsigned gpflags;
mdat = mtmp->data;
if (is_pool(x, y) && !ignorewater) {
/* [what about Breathless?] */
if (mtmp == &youmonst)
return (Levitation || Flying || Wwalking || Swimming
|| Amphibious);
return (Swimming || Amphibious
|| (!Is_waterlevel(&u.uz)
/* water on the Plane of Water has no surface
so there's no way to be on or above that */
&& (Levitation || Flying || Wwalking)));
else
return (is_floater(mdat) || is_flyer(mdat) || is_swimmer(mdat)
|| is_clinger(mdat));
return (is_swimmer(mdat)
|| (!Is_waterlevel(&u.uz)
&& (is_floater(mdat) || is_flyer(mdat)
|| is_clinger(mdat))));
} else if (mdat->mlet == S_EEL && rn2(13) && !ignorewater) {
return FALSE;
} else if (is_lava(x, y)) {
if (mtmp == &youmonst)
/* 3.6.3: floating eye can levitate over lava but it avoids
that due the effect of the heat causing it to dry out */
if (mdat == &mons[PM_FLOATING_EYE])
return FALSE;
else if (mtmp == &youmonst)
return (Levitation || Flying
|| (Fire_resistance && Wwalking && uarmf
&& uarmf->oerodeproof)