3 files changed, 34 insertions, 0 deletions
diff --git a/src/map/clif.c b/src/map/clif.c
index e1e06d890..34bdb4a2a 100644
--- a/src/map/clif.c
+++ b/src/map/clif.c
@@ -3078,6 +3078,21 @@ static void clif_inventoryExpansionInfo(struct map_session_data *sd)
 #endif
 }
 
+static void clif_inventoryExpandAck(struct map_session_data *sd, enum expand_inventory result, int itemId)
+{
+#if PACKETVER_ZERO_NUM >= 20181212
+	nullpo_retv(sd);
+
+	const int fd = sd->fd;
+	WFIFOHEAD(fd, sizeof(struct PACKET_ZC_ACK_INVENTORY_EXPAND));
+	struct PACKET_ZC_ACK_INVENTORY_EXPAND *p = WFIFOP(fd, 0);
+	p->packetType = HEADER_ZC_ACK_INVENTORY_EXPAND;
+	p->result = result;
+	p->itemId = itemId;
+	WFIFOSET(fd, sizeof(struct PACKET_ZC_ACK_INVENTORY_EXPAND));
+#endif
+}
+
 /// Removes cart (ZC_CARTOFF).
 /// 012b
 /// Client behavior:
@@ -22544,6 +22559,7 @@ void clif_defaults(void)
 	clif->cartList = clif_cartList;
 	clif->cartItems = clif_cartItems;
 	clif->inventoryExpansionInfo = clif_inventoryExpansionInfo;
+	clif->inventoryExpandAck = clif_inventoryExpandAck;
 	clif->favorite_item = clif_favorite_item;
 	clif->clearcart = clif_clearcart;
 	clif->item_identify_list = clif_item_identify_list;
diff --git a/src/map/clif.h b/src/map/clif.h
index de1d2b593..2c3e7499b 100644
--- a/src/map/clif.h
+++ b/src/map/clif.h
@@ -677,6 +677,14 @@ enum memorial_dungeon_command {
 	COMMAND_MEMORIALDUNGEON_DESTROY_FORCE = 0x3,
 };
 
+enum expand_inventory {
+	EXPAND_INVENTORY_ASK_CONFIRMATION = 0,
+	EXPAND_INVENTORY_FAILED = 1,
+	EXPAND_INVENTORY_OTHER_WORK = 2,
+	EXPAND_INVENTORY_MISSING_ITEM = 3,
+	EXPAND_INVENTORY_MAX_SIZE = 4
+};
+
 /**
  * Clif.c Interface
  **/
@@ -852,6 +860,7 @@ struct clif_interface {
 	void (*cartList) (struct map_session_data *sd);
 	void (*cartItems) (struct map_session_data *sd, enum inventory_type type);
 	void (*inventoryExpansionInfo) (struct map_session_data *sd);
+	void (*inventoryExpandAck) (struct map_session_data *sd, enum expand_inventory result, int itemId);
 	void (*favorite_item) (struct map_session_data* sd, unsigned short index);
 	void (*clearcart) (int fd);
 	void (*item_identify_list) (struct map_session_data *sd);
diff --git a/src/map/packets_struct.h b/src/map/packets_struct.h
index 78ed1a83b..663e6cbbf 100644
--- a/src/map/packets_struct.h
+++ b/src/map/packets_struct.h
@@ -2989,6 +2989,15 @@ struct PACKET_ZC_INVENTORY_EXPANSION_INFO {
 DEFINE_PACKET_HEADER(ZC_INVENTORY_EXPANSION_INFO, 0x0b18);
 #endif
 
+#if PACKETVER_ZERO_NUM >= 20181212
+struct PACKET_ZC_ACK_INVENTORY_EXPAND {
+	int16 packetType;
+	uint8 result;
+	uint32 itemId;
+} __attribute__((packed));
+DEFINE_PACKET_HEADER(ZC_ACK_INVENTORY_EXPAND, 0x0b15);
+#endif
+
 #if !defined(sun) && (!defined(__NETBSD__) || __NetBSD_Version__ >= 600000000) // NetBSD 5 and Solaris don't like pragma pack but accept the packed attribute
 #pragma pack(pop)
 #endif // not NetBSD < 6 / Solaris