Prevent segfault if repair item disappears #75413
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Prevents segfault that could previously occur if the item being repaired was invalidated. The target item being repaired could get invalidated for various reasons, such as a follower moving it via zone sorting, the item could burn up in a fire, etc. Previous segfault that this commit attempts to prevent: ``` #0 0x0000555555ef9057 in item::is_null (this=this@entry=0x0) at src/item.cpp:943 CleverRaven#1 0x000055555602322c in repair_item_actor::can_repair_target (this=this@entry=0x555560003e80, pl=..., fix=..., print_msg=print_msg@entry=true, check_consumed_available=check_consumed_available@entry=true) at src/iuse_actor.cpp:2920 CleverRaven#2 0x00005555560243c2 in repair_item_actor::repair (this=this@entry=0x555560003e80, pl=..., tool=..., fix=..., refit_only=refit_only@entry=false) at src/iuse_actor.cpp:3106 CleverRaven#3 0x00005555559d5b55 in repair_item_finish (act=0x5555580cdf58, you=0x5555580cd890, no_menu=false) at src/activity_handlers.cpp:2477 CleverRaven#4 0x0000555555a00f52 in std::function<void (player_activity*, Character*)>::operator()(player_activity*, Character*) const (this=<optimized out>, __args#0=<optimized out>, __args#0@entry=0x5555580cdf58, __args#1=<optimized out>, __args#1@entry=0x5555580cd890) at /usr/include/c++/13/bits/std_function.h:591 CleverRaven#5 0x00005555559ff229 in activity_type::call_finish (this=<optimized out>, act=act@entry=0x5555580cdf58, you=you@entry=0x5555580cd890) at src/activity_type.cpp:168 CleverRaven#6 0x00005555564e368b in player_activity::do_turn (this=0x5555580cdf58, you=...) at src/player_activity.cpp:393 CleverRaven#7 0x0000555555cec856 in do_turn () at src/do_turn.cpp:532 CleverRaven#8 0x0000555555776e74 in main (argc=<optimized out>, argv=<optimized out>) at src/main.cpp:873 ``` Instead, this commit adds a message shown to the player if the target item is no longer valid for whatever reason.
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Summary
Bugfixes "Prevent segfault if repair item disappears"
Purpose of change
Prevents segfault that could previously occur if the item being repaired was invalidated. Fixes #75113 .
Describe the solution
The target item being repaired could get invalidated for various reasons, such as a follower moving it via zone sorting, the item could burn up in a fire, etc.
Previous segfault that this commit attempts to prevent:
Instead, this commit adds a message shown to the player if the target item is no longer valid for whatever reason.
Describe alternatives you've considered
Testing
Performed the steps in #75113 . Can no longer reproduce the segfault on this branch. Instead, the new msg is shown:
Additional context