Implement MBF's -dog and -dogs cmdline parameters

src/d_main.c

@@ -2534,6 +2534,16 @@ static void D_DoomMainSetup(void)
         }
     }
 
+    if (M_CheckParm("-dog"))
+        P_InitHelperDogs(1);
+    else if ((p = M_CheckParmWithArgs("-dogs", 1)))
+    {
+        const int   dogs = strtol(myargv[p + 1], NULL, 10);
+
+        if (dogs > 0 && dogs <= 4)
+            P_InitHelperDogs(dogs);
+    }
+
     M_Init();
     R_Init();
     P_Init();

src/p_local.h

@@ -153,6 +153,7 @@ void P_MobjThinker(mobj_t *mobj);
 
 void P_SpawnMoreBlood(mobj_t *mobj);
 void P_LookForFriends(void);
+void P_InitHelperDogs(const int dogs);
 mobj_t *P_SpawnMapThing(mapthing_t *mthing, const bool spawnmonsters);
 void P_SpawnPuff(const fixed_t x, const fixed_t y, const fixed_t z, const angle_t angle);
 void P_SpawnSmokeTrail(const fixed_t x, const fixed_t y, const fixed_t z, const angle_t angle);

src/p_mobj.c

@@ -1143,6 +1143,15 @@ void P_LookForFriends(void)
             }
 }
 
+void P_InitHelperDogs(const int dogs)
+{
+    for (int i = 0; i < dogs; i++)
+    {
+        friendtype[numfriends] = MT_DOGS;
+        friendhealth[numfriends++] = mobjinfo[MT_DOGS].spawnhealth;
+    }
+}
+
 static void P_SpawnFriend(const mapthing_t *mthing)
 {
     const short playerstart = mthing->type;