[4Luke4]

Party XP arithmetic and formatting

Warning

Known bugs:

• AddXPObject queues permanent additive opcode 104 and immediately asks for character XP feedback. The effect adds a signed delta to unsigned CGameSprite.m_baseStats.m_xp. Subtracting more XP than available wraps below zero.
• CGameSprite::FeedBack formats int1 with %d and always fetches the gain message.
• CInfGame::AddPartyXP divides its post-bonus total using unsigned DIV. Its recipient loop also consumes only positive remainders.

Tip

Fixes:

• A C++ leaf normalizes only negative deltas to the available balance; the hook then executes the original ADD and completion/repass instructions. It does not change the effect's stored requested amount. Absolute, percentage and temporary-modifier paths remain native, as do positive additions and XP caps.
• A targeted C++ call replacement formats negative amounts with %u using an unsigned magnitude, including INT_MIN -> 2147483648. A before-call hook selects a translatable character-loss TLK entry for negative int1. Native eligibility/feedback settings, the EXPERIENCEAMOUNT token, character attribution, colors and message construction remain in the engine.
• Two C++ integer leaves replace the split and remainder region: signed division truncates toward zero; each extra point has the total's sign and is assigned in native recipient order. Thus -100 split among three eligible characters requests -34/-33/-33.
  Each recipient independently clamps at zero; an unaffordable portion is not reassigned. Native alive/valid-recipient selection and bonus adjustment remain in place. Party feedback retains its existing localized loss string and total; only its XP formatter is replaced to handle the INT_MIN magnitude safely.

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Notes:

• Tested on iwdee v2.7.3.0
• See also: Engine Fix: party XP arithmetic and formatting InfinityLoader#30