Remove monsterId from M_GetKnockback (#4882)

Source/missiles.cpp

@@ -182,9 +182,9 @@ void MoveMissilePos(Missile &missile)
 	}
 }
 
-bool MonsterMHit(int pnum, int m, int mindam, int maxdam, int dist, missile_id t, bool shift)
+bool MonsterMHit(int pnum, int monsterId, int mindam, int maxdam, int dist, missile_id t, bool shift)
 {
-	auto &monster = Monsters[m];
+	auto &monster = Monsters[monsterId];
 
 	if (!monster.IsPossibleToHit() || monster.IsImmune(t))
 		return false;
@@ -244,14 +244,14 @@ bool MonsterMHit(int pnum, int m, int mindam, int maxdam, int dist, missile_id t
 		monster._mFlags |= MFLAG_NOHEAL;
 
 	if (monster._mhitpoints >> 6 <= 0) {
-		M_StartKill(m, pnum);
+		M_StartKill(monsterId, pnum);
 	} else if (resist) {
 		PlayEffect(monster, 1);
 	} else {
 		if (monster._mmode != MonsterMode::Petrified && MissilesData[t].mType == 0 && HasAnyOf(player._pIFlags, ItemSpecialEffect::Knockback))
-			M_GetKnockback(m);
+			M_GetKnockback(monster);
 		if (monster.type().type != MT_GOLEM)
-			M_StartHit(m, pnum, dam);
+			M_StartHit(monsterId, pnum, dam);
 	}
 
 	if (monster._msquelch == 0) {

Source/monster.cpp

@@ -3884,10 +3884,8 @@ void M_ClearSquares(const Monster &monster)
 	}
 }
 
-void M_GetKnockback(int monsterId)
+void M_GetKnockback(Monster &monster)
 {
-	auto &monster = Monsters[monsterId];
-
 	Direction dir = Opposite(monster._mdir);
 	if (!IsRelativeMoveOK(monster, monster.position.old, dir)) {
 		return;

Source/monster.h

@@ -306,7 +306,7 @@ void AddDoppelganger(Monster &monster);
 bool M_Talker(const Monster &monster);
 void M_StartStand(Monster &monster, Direction md);
 void M_ClearSquares(const Monster &monster);
-void M_GetKnockback(int monsterId);
+void M_GetKnockback(Monster &monster);
 void M_StartHit(int monsterId, int dam);
 void M_StartHit(int monsterId, int pnum, int dam);
 void StartMonsterDeath(int monsterId, int pnum, bool sendmsg);

Source/msg.cpp

@@ -1434,7 +1434,7 @@ DWORD OnKnockback(const TCmd *pCmd, int pnum)
 	const auto &message = *reinterpret_cast<const TCmdParam1 *>(pCmd);
 
 	if (gbBufferMsgs != 1 && Players[pnum].isOnActiveLevel() && message.wParam1 < MaxMonsters) {
-		M_GetKnockback(message.wParam1);
+		M_GetKnockback(Monsters[message.wParam1]);
 		M_StartHit(message.wParam1, pnum, 0);
 	}
 

Source/player.cpp

@@ -796,14 +796,14 @@ bool DamageWeapon(Player &player, int durrnd)
 	return false;
 }
 
-bool PlrHitMonst(int pnum, int m, bool adjacentDamage = false)
+bool PlrHitMonst(int pnum, int monsterId, bool adjacentDamage = false)
 {
 	int hper = 0;
 
-	if ((DWORD)m >= MaxMonsters) {
-		app_fatal(fmt::format("PlrHitMonst: illegal monster {}", m));
+	if ((DWORD)monsterId >= MaxMonsters) {
+		app_fatal(fmt::format("PlrHitMonst: illegal monster {}", monsterId));
 	}
-	auto &monster = Monsters[m];
+	auto &monster = Monsters[monsterId];
 
 	if ((DWORD)pnum >= MAX_PLRS) {
 		app_fatal(fmt::format("PlrHitMonst: illegal player {}", pnum));
@@ -971,11 +971,11 @@ bool PlrHitMonst(int pnum, int m, bool adjacentDamage = false)
 	}
 #endif
 	if ((monster._mhitpoints >> 6) <= 0) {
-		M_StartKill(m, pnum);
+		M_StartKill(monsterId, pnum);
 	} else {
 		if (monster._mmode != MonsterMode::Petrified && HasAnyOf(player._pIFlags, ItemSpecialEffect::Knockback))
-			M_GetKnockback(m);
-		M_StartHit(m, pnum, dam);
+			M_GetKnockback(monster);
+		M_StartHit(monsterId, pnum, dam);
 	}
 
 	return true;