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fix #H6942 - dropx vs hold_another_object

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Dropping an existing fragile item while levitating will usually
break it.  Getting a new wished-for fragile item and dropping it
because of fumbling or overfull inventory never would.

Some callers of hold_another_object() held on to its return value,
others discarded that.  That return value was unsafe if the item
was dropped and fell down a hole (or broke [after this change]).
Return Null if we can't be sure of the value, and make sure all
callers are prepared to deal with Null.
This commit is contained in:
PatR
2018-12-23 12:37:26 -08:00
parent df5dc6050d
commit 7bc36ddef4
11 changed files with 68 additions and 47 deletions
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5
src/uhitm.c
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@@ -1,4 +1,4 @@
/* NetHack 3.6 uhitm.c $NHDT-Date: 1544840256 2018/12/15 02:17:36 $ $NHDT-Branch: NetHack-3.6.2-beta01 $:$NHDT-Revision: 1.196 $ */
/* NetHack 3.6 uhitm.c $NHDT-Date: 1545597432 2018/12/23 20:37:12 $ $NHDT-Branch: NetHack-3.6.2-beta01 $:$NHDT-Revision: 1.197 $ */
/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/*-Copyright (c) Robert Patrick Rankin, 2012. */
/* NetHack may be freely redistributed. See license for details. */
@@ -1546,7 +1546,8 @@ struct attack *mattk;
/* give the object to the character */
otmp = hold_another_object(otmp, "You snatched but dropped %s.",
doname(otmp), "You steal: ");
if (otmp->where != OBJ_INVENT)
/* might have dropped otmp, and it might have broken or left level */
if (!otmp || otmp->where != OBJ_INVENT)
continue;
if (theft_petrifies(otmp))
break; /* stop thieving even though hero survived */