inventory overflow control

     Prevent heroes in giant form from picking up boulders once they run
out of available inventory slots to avoid an uncontrolled number of '#'
entries.  There is an exception:  if not already carrying any boulders,
they can put one into the '#' slot.  Loadstones are treated the same way,
although since they stack and are rare to begin with, someone would have
to have gone far out of their way to have gotten many # entries with them.

     Assuming that you can get something other than a boulder or loadstone
into the # slot (which is definitely possible, I just can't remember how),
you could relatively easily get three total # entries by picking up a
loadstone and polying into a giant and picking up a boulder.  But I don't
think there's anything wrong with that.

doc/fixes34.4

@@ -264,6 +264,7 @@ fireproof containers should not burn in lava
 fix invalid pointer dereference after applying a wielded cream pie
 avoid drowned in a drowning and burned by burning if life-saving is inadequate
 reveal hidden monsters who change levels or are magically summoned
+hero can't carry an unlimited number of boulders when poly'd into a giant
 
 
 Platform- and/or Interface-Specific Fixes

src/pickup.c

@@ -1185,19 +1185,28 @@ boolean telekinesis;
 			body_part(HAND), xname(obj));
 	return -1;
     }
+    /* override weight consideration for loadstone picked up by anybody
+       and for boulder picked up by hero poly'd into a giant; override
+       availability of open inventory slot iff not already carrying one */
     if (obj->otyp == LOADSTONE ||
-	    (obj->otyp == BOULDER && throws_rocks(youmonst.data)))
-	return 1;		/* lift regardless of current situation */
+	    (obj->otyp == BOULDER && throws_rocks(youmonst.data))) {
+	if (inv_cnt() < 52 || !carrying(obj->otyp) || merge_choice(invent, obj))
+	    return 1;	/* lift regardless of current situation */
+	/* if we reach here, we're out of slots and already have at least
+	   one of these, so treat this one more like a normal item */
+	You("are carrying too much stuff to pick up %s %s.",
+	    (obj->quan == 1L) ? "another" : "more", simpleonames(obj));
+	return -1;
+    }
 
     *cnt_p = carry_count(obj, container, *cnt_p, telekinesis, &old_wt, &new_wt);
     if (*cnt_p < 1L) {
 	result = -1;	/* nothing lifted */
+    } else if (
 #ifndef GOLDOBJ
-    } else if (obj->oclass != COIN_CLASS && inv_cnt() >= 52 &&
-		!merge_choice(invent, obj)) {
-#else
-    } else if (inv_cnt() >= 52 && !merge_choice(invent, obj)) {
+		obj->oclass != COIN_CLASS &&
 #endif
+		inv_cnt() >= 52 && !merge_choice(invent, obj)) {
 	Your("knapsack cannot accommodate any more items.");
 	result = -1;	/* nothing lifted */
     } else {