From ffbbc88801de3fc56d0bf5f0af1418ca7cfcfa4f Mon Sep 17 00:00:00 2001
From: gAlfonso-bit <83477269+gAlfonso-bit@users.noreply.github.com>
Date: Sun, 23 May 2021 10:35:03 -0400
Subject: BUGFIX: battle scripts (#1436)

---
 src/battle_ai_script_commands.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

(limited to 'src/battle_ai_script_commands.c')

diff --git a/src/battle_ai_script_commands.c b/src/battle_ai_script_commands.c
index 81e7c15cc..b72875036 100644
--- a/src/battle_ai_script_commands.c
+++ b/src/battle_ai_script_commands.c
@@ -1761,7 +1761,11 @@ static void Cmd_if_cant_faint(void)
 
     gBattleMoveDamage = gBattleMoveDamage * AI_THINKING_STRUCT->simulatedRNG[AI_THINKING_STRUCT->movesetIndex] / 100;
 
-    // This macro is missing the damage 0 = 1 assumption.
+#ifdef BUGFIX
+    // Moves always do at least 1 damage.
+    if (gBattleMoveDamage == 0)
+        gBattleMoveDamage = 1;
+#endif
 
     if (gBattleMons[gBattlerTarget].hp > gBattleMoveDamage)
         gAIScriptPtr = T1_READ_PTR(gAIScriptPtr + 1);
@@ -2019,18 +2023,24 @@ static void Cmd_if_holds_item(void)
 {
     u8 battlerId = BattleAI_GetWantedBattler(gAIScriptPtr[1]);
     u16 item;
-    u8 var1, var2;
+    u8 itemLo, itemHi;
 
     if ((battlerId & BIT_SIDE) == (sBattler_AI & BIT_SIDE))
         item = gBattleMons[battlerId].item;
     else
         item = BATTLE_HISTORY->itemEffects[battlerId];
 
-    // UB: doesn't properly read an unaligned u16
-    var2 = gAIScriptPtr[2];
-    var1 = gAIScriptPtr[3];
+    itemHi = gAIScriptPtr[2];
+    itemLo = gAIScriptPtr[3];
 
-    if ((var1 | var2) == item)
+#ifdef BUGFIX
+    // This bug doesn't affect the vanilla game because this script command
+    // is only used to check ITEM_PERSIM_BERRY, whose high byte happens to
+    // be 0.
+    if (((itemHi << 8) | itemLo) == item)
+#else
+    if ((itemLo | itemHi) == item)
+#endif
         gAIScriptPtr = T1_READ_PTR(gAIScriptPtr + 4);
     else
         gAIScriptPtr += 8;
-- 
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