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-rw-r--r--src/map/npc.c22
1 files changed, 21 insertions, 1 deletions
diff --git a/src/map/npc.c b/src/map/npc.c
index 37cf06157..a95b490d9 100644
--- a/src/map/npc.c
+++ b/src/map/npc.c
@@ -51,7 +51,27 @@ static int npc_script=0;
static int npc_mob=0;
static int npc_delay_mob=0;
static int npc_cache_mob=0;
-int npc_get_new_npc_id(void){ return npc_id++; }
+
+/// Returns a new npc id that isn't being used in id_db.
+/// Fatal error if nothing is available.
+int npc_get_new_npc_id(void)
+{
+ if( npc_id >= START_NPC_NUM && map_id2bl(npc_id) == NULL )
+ return npc_id++;// available
+ {// find next id
+ int base_id = npc_id;
+ while( base_id != ++npc_id )
+ {
+ if( npc_id < START_NPC_NUM )
+ npc_id = START_NPC_NUM;
+ if( map_id2bl(npc_id) == NULL )
+ return npc_id++;// available
+ }
+ // full loop, nothing available
+ ShowFatalError("npc_get_new_npc_id: All ids are taken. Exiting...");
+ exit(1);
+ }
+}
static DBMap* ev_db; // const char* event_name -> struct event_data*
static DBMap* npcname_db; // const char* npc_name -> struct npc_data*