3 files changed, 62 insertions, 0 deletions
diff --git a/src/map/init.c b/src/map/init.c
index 6a025a8..2757aeb 100644
--- a/src/map/init.c
+++ b/src/map/init.c
@@ -104,6 +104,7 @@ HPExport void plugin_init (void)
     addHookPre("pc->unequipitem_pos", epc_unequipitem_pos);
     addHookPre("pc->can_attack", epc_can_attack);
     addHookPre("npc->parse_unknown_mapflag", enpc_parse_unknown_mapflag);
+    addHookPre("npc->buysellsel", enpc_buysellsel);
     addHookPre("clif->quest_send_list", eclif_quest_send_list);
     addHookPre("clif->quest_add", eclif_quest_add);
     addHookPre("clif->charnameack", eclif_charnameack);
diff --git a/src/map/npc.c b/src/map/npc.c
index 7b15491..74ec586 100644
--- a/src/map/npc.c
+++ b/src/map/npc.c
@@ -52,3 +52,62 @@ void enpc_parse_unknown_mapflag(const char *name, char *w3, char *w4, const char
             *retval = EXIT_FAILURE;
     }
 }
+
+int enpc_buysellsel(struct map_session_data* sd, int *id, int *type)
+{
+    struct npc_data *nd;
+
+    if (!sd)
+        return 1;
+
+    if ((nd = npc->checknear(sd, map->id2bl(*id))) == NULL)
+    {
+        hookStop();
+        return 1;
+    }
+
+    if (nd->option & OPTION_INVISIBLE) // can't buy if npc is not visible (hack?)
+    {
+        hookStop();
+        return 1;
+    }
+
+    if (*type == 0 && nd->subtype == SCRIPT && nd->u.scr.shop && nd->u.scr.shop->type == NST_MARKET)
+    {
+        clif->npc_market_open(sd, nd);
+        hookStop();
+        return 0;
+    }
+
+    if (nd->subtype != SHOP && !(nd->subtype == SCRIPT && nd->u.scr.shop && nd->u.scr.shop->items))
+    {
+        if (nd->subtype == SCRIPT)
+            ShowError("npc_buysellsel: trader '%s' has no shop list!\n", nd->exname);
+        else
+            ShowError("npc_buysellsel: no such shop npc %d (%s)\n", *id, nd->exname);
+
+        if (sd->npc_id == *id)
+            sd->npc_id = 0;
+        hookStop();
+        return 1;
+    }
+
+    if (nd->class_ < 0 && !sd->state.callshop)
+    {  // not called through a script and is not a visible NPC so an invalid call
+        hookStop();
+        return 1;
+    }
+
+    // reset the callshop state for future calls
+    sd->state.callshop = 0;
+    sd->npc_shopid = *id;
+
+    if (*type == 0)
+        clif->buylist(sd, nd);
+    else
+        clif->selllist(sd);
+
+    hookStop();
+    return 0;
+}
+
diff --git a/src/map/npc.h b/src/map/npc.h
index 54685b2..f4ca1b9 100644
--- a/src/map/npc.h
+++ b/src/map/npc.h
@@ -7,4 +7,6 @@
 void enpc_parse_unknown_mapflag(const char *name, char *w3, char *w4, const char* start,
                                 const char* buffer, const char* filepath, int *retval);
 
+int enpc_buysellsel(struct map_session_data* sd, int *id, int *type);
+
 #endif  // EVOL_MAP_NPC