Add different fixes for gcc 7 warnings.

Some possible buffer overflows.
Add attribute for mark fallthrough cases.
Skipped libconfig warnings.

13 files changed, 111 insertions, 20 deletions

diff --git a/src/map/battle.c b/src/map/battle.c
index 01072702d..daef8f6a8 100644
--- a/src/map/battle.c
+++ b/src/map/battle.c
@@ -693,6 +693,7 @@ int64 battle_addmastery(struct map_session_data *sd,struct block_list *target,in
 			#ifdef RENEWAL
 				if((skill_lv = pc->checkskill(sd,AM_AXEMASTERY)) > 0)
 					damage += (skill_lv * 3);
+				FALLTHROUGH
 			#endif
 		case W_DAGGER:
 			if((skill_lv = pc->checkskill(sd,SM_SWORD)) > 0)
@@ -737,6 +738,7 @@ int64 battle_addmastery(struct map_session_data *sd,struct block_list *target,in
 			if((skill_lv = pc->checkskill(sd,TK_RUN)) > 0)
 				damage += (skill_lv * 10);
 			// No break, fall through to Knuckles
+			FALLTHROUGH
 		case W_KNUCKLE:
 			if((skill_lv = pc->checkskill(sd,MO_IRONHAND)) > 0)
 				damage += (skill_lv * 3);
@@ -3005,6 +3007,7 @@ int64 battle_calc_damage(struct block_list *src,struct block_list *bl,struct Dam
 					case W_WHIP:
 						if(!t_sd->state.arrow_atk)
 							break;
+						FALLTHROUGH
 					case W_BOW:
 					case W_REVOLVER:
 					case W_RIFLE:
@@ -4256,7 +4259,9 @@ struct Damage battle_calc_misc_attack(struct block_list *src,struct block_list *
 	switch( skill_id ) {
 		case RA_FIRINGTRAP:
 		case RA_ICEBOUNDTRAP:
-			if( md.damage == 1 ) break;
+			if (md.damage == 1)
+				break;
+			FALLTHROUGH
 		case RA_CLUSTERBOMB:
 			{
 				struct Damage wd;
@@ -4556,16 +4561,19 @@ struct Damage battle_calc_weapon_attack(struct block_list *src,struct block_list
 							wd.div_ = 5;
 							break;
 						}
+						FALLTHROUGH
 					case 4:
 						if( chance < 7){// 6 % chance to attack 4 times.
 							wd.div_ = 4;
 							break;
 						}
+						FALLTHROUGH
 					case 3:
 						if( chance < 10){// 9 % chance to attack 3 times.
 							wd.div_ = 3;
 							break;
 						}
+						FALLTHROUGH
 					case 2:
 					case 1:
 						if( chance < 13){// 12 % chance to attack 2 times.
@@ -4619,6 +4627,7 @@ struct Damage battle_calc_weapon_attack(struct block_list *src,struct block_list
 				if(!(sc && sc->data[SC_AUTOCOUNTER]))
 					break;
 				status_change_end(src, SC_AUTOCOUNTER, INVALID_TIMER);
+				FALLTHROUGH
 			case KN_AUTOCOUNTER:
 				if(battle_config.auto_counter_type &&
 					(battle_config.auto_counter_type&src->type))
@@ -5074,7 +5083,7 @@ struct Damage battle_calc_weapon_attack(struct block_list *src,struct block_list
 					wd.damage = battle->calc_masteryfix(src, target, skill_id, skill_lv, wd.damage, wd.div_, 0, flag.weapon);
 					wd.damage = battle->calc_cardfix2(src, target, wd.damage, s_ele, nk, wd.flag);
 				}
-				/* Fall through */
+				FALLTHROUGH
 	#endif
 			default:
 				ATK_RATE(battle->calc_skillratio(BF_WEAPON, src, target, skill_id, skill_lv, skillratio, wflag));
@@ -6546,6 +6555,7 @@ int battle_check_target( struct block_list *src, struct block_list *target,int f
 					case RK_DRAGONBREATH_WATER:
 						if( !map->list[m].flag.pvp && !map->list[m].flag.gvg )
 							break;
+						FALLTHROUGH
 					case 0://you can hit them without skills
 					case MA_REMOVETRAP:
 					case HT_REMOVETRAP:
diff --git a/src/map/battleground.c b/src/map/battleground.c
index 5231ce3d2..7419a1928 100644
--- a/src/map/battleground.c
+++ b/src/map/battleground.c
@@ -862,11 +862,11 @@ enum BATTLEGROUNDS_QUEUE_ACK bg_canqueue(struct map_session_data *sd, struct bg_
 					count++;
 				}
 				if ( count < arena->min_team_players ) {
-					char response[117];
+					char response[121];
 					if( count != sd->guild->connect_member && sd->guild->connect_member >= arena->min_team_players )
-						sprintf(response, "Can't apply: not enough members in your team/guild that have not entered the queue in individual mode, minimum is %d",arena->min_team_players);
+						sprintf(response, "Can't apply: not enough members in your team/guild that have not entered the queue in individual mode, minimum is %d", arena->min_team_players);
 					else
-						sprintf(response, "Can't apply: not enough members in your team/guild, minimum is %d",arena->min_team_players);
+						sprintf(response, "Can't apply: not enough members in your team/guild, minimum is %d", arena->min_team_players);
 					clif->messagecolor_self(sd->fd, COLOR_RED, response);
 					return BGQA_FAIL_TEAM_COUNT;
 				}
@@ -894,9 +894,9 @@ enum BATTLEGROUNDS_QUEUE_ACK bg_canqueue(struct map_session_data *sd, struct bg_
 						return BGQA_NOT_PARTY_GUILD_LEADER;
 
 					if( count < arena->min_team_players ) {
-						char response[117];
+						char response[121];
 						if( count != p->party.count && p->party.count >= arena->min_team_players )
-							sprintf(response, "Can't apply: not enough members in your team/party that have not entered the queue in individual mode, minimum is %d",arena->min_team_players);
+							sprintf(response, "Can't apply: not enough members in your team/party that have not entered the queue in individual mode, minimum is %d", arena->min_team_players);
 						else
 							sprintf(response, "Can't apply: not enough members in your team/party, minimum is %d",arena->min_team_players);
 						clif->messagecolor_self(sd->fd, COLOR_RED, response);
diff --git a/src/map/clif.c b/src/map/clif.c
index 09e8bbb6b..040f86a58 100644
--- a/src/map/clif.c
+++ b/src/map/clif.c
@@ -13833,6 +13833,7 @@ void clif_parse_NoviceDoriDori(int fd, struct map_session_data *sd)
 		case MAPID_TAEKWON:
 			if (!sd->state.rest)
 				break;
+			FALLTHROUGH
 		case MAPID_SUPER_NOVICE:
 			sd->state.doridori=1;
 			break;
diff --git a/src/map/homunculus.c b/src/map/homunculus.c
index 080a314b8..cc920b888 100644
--- a/src/map/homunculus.c
+++ b/src/map/homunculus.c
@@ -1215,7 +1215,7 @@ void homunculus_read_db(void) {
 		if( i > 0 ) {
 			char filepath[256];
 
-			sprintf(filepath, "%s/%s", map->db_path, filename[i]);
+			snprintf(filepath, 256, "%s/%s", map->db_path, filename[i]);
 
 			if( !exists(filepath) ) {
 				continue;
diff --git a/src/map/itemdb.c b/src/map/itemdb.c
index 350697a08..2e44393fe 100644
--- a/src/map/itemdb.c
+++ b/src/map/itemdb.c
@@ -1376,7 +1376,7 @@ void itemdb_read_combos(void)
 	char filepath[256];
 	FILE* fp;
 
-	sprintf(filepath, "%s/%s", map->db_path, DBPATH"item_combo_db.txt");
+	snprintf(filepath, 256, "%s/%s", map->db_path, DBPATH"item_combo_db.txt");
 
 	if ((fp = fopen(filepath, "r")) == NULL) {
 		ShowError("itemdb_read_combos: File not found \"%s\".\n", filepath);
diff --git a/src/map/map.c b/src/map/map.c
index 47e22fa9b..0a60a92b4 100644
--- a/src/map/map.c
+++ b/src/map/map.c
@@ -1929,6 +1929,7 @@ int map_quit(struct map_session_data *sd) {
 					case SC_GDSKILL_REGENERATION:
 						if( !sd->sc.data[i]->val4 )
 							break;
+						FALLTHROUGH
 					default:
 						status_change_end(&sd->bl, (sc_type)i, INVALID_TIMER);
 				}
@@ -3738,8 +3739,8 @@ int map_readallmaps (void) {
 	if( map->enable_grf )
 		ShowStatus("Loading maps (using GRF files)...\n");
 	else {
-		char mapcachefilepath[254];
-		sprintf(mapcachefilepath,"%s/%s%s",map->db_path,DBPATH,"map_cache.dat");
+		char mapcachefilepath[256];
+		snprintf(mapcachefilepath, 256, "%s/%s%s", map->db_path, DBPATH, "map_cache.dat");
 		ShowStatus("Loading maps (using %s as map cache)...\n", mapcachefilepath);
 		if( (fp = fopen(mapcachefilepath, "rb")) == NULL ) {
 			ShowFatalError("Unable to open map cache file "CL_WHITE"%s"CL_RESET"\n", mapcachefilepath);
@@ -4394,7 +4395,7 @@ struct map_zone_data *map_merge_zone(struct map_zone_data *main, struct map_zone
 	nullpo_retr(NULL, main);
 	nullpo_retr(NULL, other);
 
-	sprintf(newzone, "%s+%s",main->name,other->name);
+	snprintf(newzone, MAP_ZONE_NAME_LENGTH, "%s+%s", main->name, other->name);
 
 	if( (zone = strdb_get(map->zone_db, newzone)) )
 		return zone;/* this zone has already been merged */
diff --git a/src/map/mob.c b/src/map/mob.c
index bede7deed..590cbf856 100644
--- a/src/map/mob.c
+++ b/src/map/mob.c
@@ -1099,6 +1099,7 @@ int mob_ai_sub_hard_activesearch(struct block_list *bl, va_list ap)
 		case BL_PC:
 			if (BL_UCCAST(BL_PC, bl)->state.gangsterparadise && !(status_get_mode(&md->bl)&MD_BOSS))
 				return 0; //Gangster paradise protection.
+			FALLTHROUGH
 		default:
 			if (battle_config.hom_setting&0x4 &&
 				(*target) && (*target)->type == BL_HOM && bl->type != BL_HOM)
@@ -1326,6 +1327,7 @@ int mob_unlocktarget(struct mob_data *md, int64 tick) {
 			break;
 		//Because it is not unset when the mob finishes walking.
 		md->state.skillstate = MSS_IDLE;
+		FALLTHROUGH
 	case MSS_IDLE:
 		// Idle skill.
 		if (!(++md->ud.walk_count%IDLE_SKILL_INTERVAL) && mob->skill_use(md, tick, -1))
@@ -3289,6 +3291,7 @@ int mobskill_use(struct mob_data *md, int64 tick, int event) {
 						bl = map->id2bl(md->master_id);
 					if (bl) //Otherwise, fall through.
 						break;
+					FALLTHROUGH
 				case MST_FRIEND:
 					bl = fbl?fbl:(fmd?&fmd->bl:&md->bl);
 					break;
@@ -3331,6 +3334,7 @@ int mobskill_use(struct mob_data *md, int64 tick, int event) {
 						bl = map->id2bl(md->master_id);
 					if (bl) //Otherwise, fall through.
 						break;
+					FALLTHROUGH
 				case MST_FRIEND:
 					if (fbl) {
 						bl = fbl;
@@ -3339,6 +3343,7 @@ int mobskill_use(struct mob_data *md, int64 tick, int event) {
 						bl = &fmd->bl;
 						break;
 					} // else fall through
+					FALLTHROUGH
 				default:
 					bl = &md->bl;
 					break;
@@ -5057,7 +5062,7 @@ void mob_readskilldb(void) {
 	for( fi = 0; fi < ARRAYLENGTH(filename); ++fi ) {
 		if(fi > 0) {
 			char filepath[256];
-			sprintf(filepath, "%s/%s", map->db_path, filename[fi]);
+			snprintf(filepath, 256, "%s/%s", map->db_path, filename[fi]);
 			if(!exists(filepath)) {
 				continue;
 			}
diff --git a/src/map/npc_chat.c b/src/map/npc_chat.c
index 4bd7d416d..7eb317e49 100644
--- a/src/map/npc_chat.c
+++ b/src/map/npc_chat.c
@@ -393,7 +393,7 @@ int npc_chat_sub(struct block_list* bl, va_list ap)
 				// save out the matched strings
 				for (i = 0; i < r; i++)
 				{
-					char var[12], val[255];
+					char var[15], val[255];
 					snprintf(var, sizeof(var), "$@p%i$", i);
 					libpcre->copy_substring(msg, offsets, r, i, val, sizeof(val));
 					script->set_var(sd, var, val);
diff --git a/src/map/pc.c b/src/map/pc.c
index 51d02ff40..0674f0137 100644
--- a/src/map/pc.c
+++ b/src/map/pc.c
@@ -11504,7 +11504,7 @@ void pc_autotrade_update(struct map_session_data *sd, enum e_pc_autotrade_update
 										))
 				Sql_ShowDebug(map->mysql_handle);
 		}
-			/* yes we want it to fall */
+		FALLTHROUGH
 		case PAUC_REFRESH:
 			for( i = 0; i < sd->vend_num; i++ ) {
 				if( sd->vending[i].amount == 0 )
diff --git a/src/map/quest.c b/src/map/quest.c
index ecaa8720e..544ddf985 100644
--- a/src/map/quest.c
+++ b/src/map/quest.c
@@ -541,7 +541,7 @@ int quest_read_db(void)
 	int i = 0, count = 0;
 	const char *filename = "quest_db.conf";
 
-	sprintf(filepath, "%s/%s", map->db_path, filename);
+	snprintf(filepath, 256, "%s/%s", map->db_path, filename);
 	if (!libconfig->load_file(&quest_db_conf, filepath))
 		return -1;
 
diff --git a/src/map/script.c b/src/map/script.c
index f8754660c..a1efbb3b8 100644
--- a/src/map/script.c
+++ b/src/map/script.c
@@ -2291,7 +2291,7 @@ void read_constdb(void)
 	struct config_setting_t *t;
 	int i = 0;
 
-	sprintf(filepath, "%s/constants.conf", map->db_path);
+	snprintf(filepath, 256, "%s/constants.conf", map->db_path);
 
 	if (!libconfig->load_file(&constants_conf, filepath))
 		return;
@@ -9269,7 +9269,7 @@ BUILDIN(bonus) {
 				val1 = skill->name2id(script_getstr(st, 3));
 				break;
 			}
-			// else fall through
+			FALLTHROUGH
 		default:
 			val1 = script_getnum(st,3);
 			break;
diff --git a/src/map/skill.c b/src/map/skill.c
index ab1c026f3..2559a7a5b 100644
--- a/src/map/skill.c
+++ b/src/map/skill.c
@@ -557,6 +557,7 @@ int skillnotok (uint16 skill_id, struct map_session_data *sd)
 				clif->skill_fail(sd,skill_id,USESKILL_FAIL_THERE_ARE_NPC_AROUND,0);
 				return 1;
 			}
+			FALLTHROUGH
 		case MC_IDENTIFY:
 			return 0; // always allowed
 		case WZ_ICEWALL:
@@ -2508,6 +2509,7 @@ int skill_attack(int attack_type, struct block_list* src, struct block_list *dsr
 		case KO_MUCHANAGE:
 			if( dmg.dmg_lv == ATK_FLEE )
 				break;
+			FALLTHROUGH
 		case WL_SOULEXPANSION:
 		case WL_COMET:
 		case NJ_HUUMA:
@@ -2520,6 +2522,7 @@ int skill_attack(int attack_type, struct block_list* src, struct block_list *dsr
 		case LG_OVERBRAND:
 			/* Fall through */
 			dmg.amotion = status_get_amotion(src) * 2;
+			FALLTHROUGH
 		case LG_OVERBRAND_PLUSATK:
 			dmg.dmotion = clif->skill_damage(dsrc,bl,tick,status_get_amotion(src),dmg.dmotion,damage,dmg.div_,skill_id,-1,BDT_SPLASH);
 			break;
@@ -2578,6 +2581,7 @@ int skill_attack(int attack_type, struct block_list* src, struct block_list *dsr
 			dmg.dmotion = clif->skill_damage(src,bl,tick, dmg.amotion, dmg.dmotion, damage, dmg.div_, skill_id, (flag&SD_LEVEL) ? -1 : skill_lv, BDT_SPLASH);
 			if( dsrc != src ) // avoid damage display redundancy
 				break;
+			FALLTHROUGH
 		case HT_LANDMINE:
 			dmg.dmotion = clif->skill_damage(dsrc,bl,tick, dmg.amotion, dmg.dmotion, damage, dmg.div_, skill_id, -1, type);
 			break;
@@ -2590,6 +2594,7 @@ int skill_attack(int attack_type, struct block_list* src, struct block_list *dsr
 		case AB_DUPLELIGHT_MELEE:
 		case AB_DUPLELIGHT_MAGIC:
 			dmg.amotion = 300;/* makes the damage value not overlap with previous damage (when displayed by the client) */
+			FALLTHROUGH
 		default:
 			skill->attack_display_unknown(&attack_type, src, dsrc, bl, &skill_id, &skill_lv, &tick, &flag, &type, &dmg, &damage);
 			break;
@@ -3003,6 +3008,7 @@ int skill_check_unit_range_sub(struct block_list *bl, va_list ap)
 		case AL_PNEUMA:
 			if(g_skill_id == SA_LANDPROTECTOR)
 				break;
+			FALLTHROUGH
 		case MG_SAFETYWALL:
 		case MH_STEINWAND:
 		case SC_MAELSTROM:
@@ -3425,6 +3431,7 @@ int skill_timerskill(int tid, int64 tick, int id, intptr_t data) {
 						skill->blown(src,target,skill->get_blewcount(skl->skill_id, skl->skill_lv), -1, 0x0 );
 						break;
 					}
+					FALLTHROUGH
 				}
 				default:
 					skill->timerskill_target_unknown(tid, tick, src, target, ud, skl);
@@ -3451,6 +3458,7 @@ int skill_timerskill(int tid, int64 tick, int id, intptr_t data) {
 
 						map->foreachinarea(skill->cell_overlap,src->m,skl->x-i,skl->y-i,skl->x+i,skl->y+i,BL_SKILL,skl->skill_id,&dummy,src);
 					}
+					FALLTHROUGH
 				// fall through ...
 				case WL_EARTHSTRAIN:
 					skill->unitsetting(src,skl->skill_id,skl->skill_lv,skl->x,skl->y,(skl->type<<16)|skl->flag);
@@ -3958,6 +3966,7 @@ int skill_castend_damage_id(struct block_list* src, struct block_list *bl, uint1
 		case MC_CARTREVOLUTION:
 		case NPC_SPLASHATTACK:
 			flag |= SD_PREAMBLE; // a fake packet will be sent for the first target to be hit
+			FALLTHROUGH
 		case AS_SPLASHER:
 		case HT_BLITZBEAT:
 		case AC_SHOWER:
@@ -4338,6 +4347,7 @@ int skill_castend_damage_id(struct block_list* src, struct block_list *bl, uint1
 			if( (tsc = status->get_sc(bl)) && tsc->data[SC_HIDING] )
 				break;
 			}
+			FALLTHROUGH
 		case HVAN_EXPLOSION:
 			if (src != bl)
 				skill->attack(BF_MISC,src,src,bl,skill_id,skill_lv,tick,flag);
@@ -4595,6 +4605,7 @@ int skill_castend_damage_id(struct block_list* src, struct block_list *bl, uint1
 				}
 				break;
 			}
+			FALLTHROUGH
 		case RA_WUGBITE:
 			if( path->search(NULL,src,src->m,src->x,src->y,bl->x,bl->y,1,CELL_CHKNOREACH) ) {
 				skill->attack(BF_WEAPON,src,src,bl,skill_id,skill_lv,tick,flag);
@@ -5353,6 +5364,7 @@ int skill_castend_nodamage_id(struct block_list *src, struct block_list *bl, uin
 				if (sd) clif->skill_fail(sd,skill_id,USESKILL_FAIL_LEVEL,0) ;
 				break ;
 			}
+			FALLTHROUGH
 		case AL_HEAL:
 
 		/**
@@ -7592,6 +7604,7 @@ int skill_castend_nodamage_id(struct block_list *src, struct block_list *bl, uin
 								// remove trap should be used instead
 								break;
 							// otherwise fall through to below
+							FALLTHROUGH
 						case UNT_BLASTMINE:
 						case UNT_SKIDTRAP:
 						case UNT_LANDMINE:
@@ -7629,7 +7642,8 @@ int skill_castend_nodamage_id(struct block_list *src, struct block_list *bl, uin
 			clif->skill_nodamage(src,bl,skill_id,skill_lv,
 				sc_start4(src,bl,type,100,skill_lv,skill_id,src->id,skill->get_time(skill_id,skill_lv),1000));
 		#ifndef RENEWAL
-			if (sd) skill->blockpc_start (sd, skill_id, skill->get_time(skill_id, skill_lv)+3000);
+			if (sd)
+				skill->blockpc_start(sd, skill_id, skill->get_time(skill_id, skill_lv) + 3000);
 		#endif
 			break;
 
@@ -10406,6 +10420,7 @@ int skill_castend_pos2(struct block_list* src, int x, int y, uint16 skill_id, ui
 				clif->skill_fail(sd,skill_id,USESKILL_FAIL_LEVEL,0);
 				break;
 			}
+			FALLTHROUGH
 
 		case MG_SAFETYWALL:
 		{
@@ -10415,6 +10430,7 @@ int skill_castend_pos2(struct block_list* src, int x, int y, uint16 skill_id, ui
 				return 0; // Don't consume gems if cast on LP
 			}
 		}
+		FALLTHROUGH
 		case MG_FIREWALL:
 		case MG_THUNDERSTORM:
 
@@ -10525,6 +10541,7 @@ int skill_castend_pos2(struct block_list* src, int x, int y, uint16 skill_id, ui
 		case RL_B_TRAP:
 		case MH_XENO_SLASHER:
 			flag|=1;//Set flag to 1 to prevent deleting ammo (it will be deleted on group-delete).
+			FALLTHROUGH
 		case GS_GROUNDDRIFT: //Ammo should be deleted right away.
 			if ( skill_id == WM_SEVERE_RAINSTORM )
 				sc_start(src,src,SC_NO_SWITCH_EQUIP,100,0,skill->get_time(skill_id,skill_lv));
@@ -11284,8 +11301,10 @@ struct skill_unit_group* skill_unitsetting(struct block_list *src, uint16 skill_
 		case HT_ANKLESNARE:
 			if( flag&2 )
 				val3 = SC_ESCAPE;
+			FALLTHROUGH
 		case HT_SHOCKWAVE:
 			val1=skill_lv*15+10;
+			FALLTHROUGH
 		case HT_SANDMAN:
 		case MA_SANDMAN:
 		case HT_CLAYMORETRAP:
@@ -11470,12 +11489,16 @@ struct skill_unit_group* skill_unitsetting(struct block_list *src, uint16 skill_
 			{
 				case ELE_FIRE:
 					subunt++;
+					FALLTHROUGH
 				case ELE_WATER:
 					subunt++;
+					FALLTHROUGH
 				case ELE_POISON:
 					subunt++;
+					FALLTHROUGH
 				case ELE_DARK:
 					subunt++;
+					FALLTHROUGH
 				case ELE_WIND:
 					break;
 				default:
@@ -11512,6 +11535,7 @@ struct skill_unit_group* skill_unitsetting(struct block_list *src, uint16 skill_
 				target = BCT_ALL;
 			val1 = skill_lv + 1;
 			val2 = 1;
+			FALLTHROUGH
 		case WM_POEMOFNETHERWORLD: // Can't be placed on top of Land Protector.
 		case SO_WATER_INSIGNIA:
 		case SO_FIRE_INSIGNIA:
@@ -11836,6 +11860,7 @@ int skill_unit_onplace(struct skill_unit *src, struct block_list *bl, int64 tick
 		case UNT_HERMODE:
 			if (sg->src_id!=bl->id && battle->check_target(&src->bl,bl,BCT_PARTY|BCT_GUILD) > 0)
 				status->change_clear_buffs(bl,1); //Should dispell only allies.
+			FALLTHROUGH
 		case UNT_RICHMANKIM:
 		case UNT_ETERNALCHAOS:
 		case UNT_DRUMBATTLEFIELD:
@@ -11854,6 +11879,7 @@ int skill_unit_onplace(struct skill_unit *src, struct block_list *bl, int64 tick
 			if (!battle_config.song_timer_reset && sc && sce)
 				return 0;
 			// Let it fall through
+			FALLTHROUGH
 		case UNT_WHISTLE:
 		case UNT_ASSASSINCROSS:
 		case UNT_POEMBRAGI:
@@ -12238,11 +12264,13 @@ int skill_unit_onplace_timer(struct skill_unit *src, struct block_list *bl, int6
 		case UNT_VERDURETRAP:
 			if( bl->type == BL_PC )// it won't work on players
 				break;
+			FALLTHROUGH
 		case UNT_FIRINGTRAP:
 		case UNT_ICEBOUNDTRAP:
 		case UNT_CLUSTERBOMB:
 			if( bl->id == ss->id )// it won't trigger on caster
 				break;
+			FALLTHROUGH
 		case UNT_LANDMINE:
 		case UNT_BLASTMINE:
 		case UNT_SHOCKWAVE:
@@ -12534,6 +12562,7 @@ int skill_unit_onplace_timer(struct skill_unit *src, struct block_list *bl, int6
 		case UNT_STEALTHFIELD:
 			if( bl->id == sg->src_id )
 				break; // Don't work on Self (video shows that)
+			FALLTHROUGH
 		case UNT_NEUTRALBARRIER:
 			sc_start(ss,bl,type,100,sg->skill_lv,sg->interval + 100);
 			break;
@@ -13315,6 +13344,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, uint16 skill_id
 		case KO_YAMIKUMO:
 			if( sc && sc->data[status->skill2sc(skill_id)] )
 				return 1;
+			FALLTHROUGH
 		default:
 		{
 			int ret = skill->check_condition_castbegin_off_unknown(sc, &skill_id);
@@ -13421,6 +13451,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, uint16 skill_id
 				clif->skill_fail(sd,skill_id,USESKILL_FAIL_LEVEL,0);
 				return 0;
 			}
+			FALLTHROUGH
 		case SA_CASTCANCEL:
 			if(sd->ud.skilltimer == INVALID_TIMER) {
 				clif->skill_fail(sd,skill_id,USESKILL_FAIL_LEVEL,0);
@@ -13670,6 +13701,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, uint16 skill_id
 				clif->skill_fail(sd,skill_id,USESKILL_FAIL_LEVEL,0);
 				return 0;
 			}
+			FALLTHROUGH
 		case GD_EMERGENCYCALL:
 			// other checks were already done in skillnotok()
 			if (!sd->status.guild_id || !sd->state.gmaster_flag)
@@ -13692,6 +13724,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, uint16 skill_id
 				clif->skill_fail(sd,skill_id,USESKILL_FAIL_LEVEL,0);
 				return 0;
 			}
+			FALLTHROUGH
 		case NJ_BUNSINJYUTSU:
 			if (!(sc && sc->data[SC_NJ_NEN])) {
 				clif->skill_fail(sd,skill_id,USESKILL_FAIL_LEVEL,0);
@@ -14018,6 +14051,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, uint16 skill_id
 				clif->skill_fail(sd,skill_id,USESKILL_FAIL_LEVEL,0);
 				return 0;
 			}
+			FALLTHROUGH
 		case ST_CART:
 			if(!pc_iscarton(sd)) {
 				clif->skill_fail(sd,skill_id,USESKILL_FAIL_CART,0);
@@ -14111,11 +14145,13 @@ int skill_check_condition_castbegin(struct map_session_data* sd, uint16 skill_id
 				clif->skill_fail(sd,skill_id,USESKILL_FAIL_LEVEL,0);
 				return 0;
 			}
+			FALLTHROUGH
 		case ST_MH_GRAPPLING:
 			if (!(sc && sc->data[SC_STYLE_CHANGE] && sc->data[SC_STYLE_CHANGE]->val2 == MH_MD_GRAPPLING)){
 				clif->skill_fail(sd,skill_id,USESKILL_FAIL_LEVEL,0);
 				return 0;
 			}
+			FALLTHROUGH
 		case ST_PECO:
 			if (!pc_isridingpeco(sd)) {
 				clif->skill_fail(sd,skill_id,USESKILL_FAIL_LEVEL,0);
@@ -14989,6 +15025,7 @@ int skill_vfcastfix(struct block_list *bl, double time, uint16 skill_id, uint16
 					case WZ_FIREPILLAR:
 						if(skill_lv < 5)
 							break;
+						FALLTHROUGH
 					case HW_GRAVITATION:
 					case MG_SAFETYWALL:
 					case MG_STONECURSE:
@@ -16740,6 +16777,7 @@ int skill_unit_timer_sub(union DBKey key, struct DBData *data, va_list ap)
 					skill->delunit(su);
 					break;
 				}
+				FALLTHROUGH
 			case UNT_SKIDTRAP:
 			case UNT_LANDMINE:
 			case UNT_SHOCKWAVE:
@@ -17404,12 +17442,15 @@ int skill_produce_mix(struct map_session_data *sd, uint16 skill_id, int nameid,
 					case ITEMID_HAGALAZ:
 					case ITEMID_OTHILA:
 						D -= 500; //Rank C
+						FALLTHROUGH
 					case ITEMID_ISA:
 					case ITEMID_WYRD:
 						D -= 500; //Rank B
+						FALLTHROUGH
 					case ITEMID_NAUTHIZ:
 					case ITEMID_URUZ:
 						D -= 500; //Rank A
+						FALLTHROUGH
 					case ITEMID_BERKANA:
 					case ITEMID_LUX_ANIMA:
 						D -= 500; //Rank S
diff --git a/src/map/status.c b/src/map/status.c
index f10f5fd9f..5e65244ef 100644
--- a/src/map/status.c
+++ b/src/map/status.c
@@ -1821,9 +1821,13 @@ int status_check_skilluse(struct block_list *src, struct block_list *target, uin
 			switch (sc->data[SC_BLADESTOP]->val1)
 			{
 			case 5: if (skill_id == MO_EXTREMITYFIST) break;
+				FALLTHROUGH
 			case 4: if (skill_id == MO_CHAINCOMBO) break;
+				FALLTHROUGH
 			case 3: if (skill_id == MO_INVESTIGATE) break;
+				FALLTHROUGH
 			case 2: if (skill_id == MO_FINGEROFFENSIVE) break;
+				FALLTHROUGH
 			default: return 0;
 			}
 		}
@@ -1987,6 +1991,7 @@ int status_check_skilluse(struct block_list *src, struct block_list *target, uin
 				return 0; // Can't use Weapon endow skills on Mercenary (only Master)
 			if( skill_id == AM_POTIONPITCHER && ( target->type == BL_MER || target->type == BL_ELEM) )
 				return 0; // Can't use Potion Pitcher on Mercenaries
+			FALLTHROUGH
 		default:
 			//Check for chase-walk/hiding/cloaking opponents.
 			if( tsc ) {
@@ -7457,8 +7462,10 @@ int status_change_start(struct block_list *src, struct block_list *bl, enum sc_t
 		case SC_GOLDENE_FERSE:
 			if ((type==SC_GOLDENE_FERSE && sc->data[SC_ANGRIFFS_MODUS])
 				|| (type==SC_ANGRIFFS_MODUS && sc->data[SC_GOLDENE_FERSE])
-				)
+				) {
 				return 0;
+			}
+			FALLTHROUGH
 		case SC_VACUUM_EXTREME:
 			if(sc->data[SC_HALLUCINATIONWALK])
 				return 0;
@@ -7466,10 +7473,12 @@ int status_change_start(struct block_list *src, struct block_list *bl, enum sc_t
 		case SC_STONE:
 			if(sc->data[SC_POWER_OF_GAIA])
 				return 0;
+			FALLTHROUGH
 		case SC_FREEZE:
 			//Undead are immune to Freeze/Stone
 			if (undead_flag && !(flag&SCFLAG_NOAVOID))
 				return 0;
+			FALLTHROUGH
 		case SC_SLEEP:
 		case SC_STUN:
 		case SC_FROSTMISTY:
@@ -7502,6 +7511,7 @@ int status_change_start(struct block_list *src, struct block_list *bl, enum sc_t
 		case SC_OVERTHRUST:
 			if (sc->data[SC_OVERTHRUSTMAX])
 				return 0; // Overthrust can't take effect if under Max Overthrust. [Skotlex]
+			FALLTHROUGH
 		case SC_OVERTHRUSTMAX:
 			if (sc->option&OPTION_MADOGEAR)
 				return 0; // Overthrust and Overthrust Max cannot be used on Mado Gear [Ind]
@@ -7527,6 +7537,7 @@ int status_change_start(struct block_list *src, struct block_list *bl, enum sc_t
 		case SC_TWOHANDQUICKEN:
 			if (sc->data[SC_DEC_AGI])
 				return 0;
+			FALLTHROUGH
 		case SC_CONCENTRATION:
 		case SC_SPEARQUICKEN:
 		case SC_TRUESIGHT:
@@ -7535,6 +7546,7 @@ int status_change_start(struct block_list *src, struct block_list *bl, enum sc_t
 		case SC_ASSNCROS:
 			if (sc->option&OPTION_MADOGEAR)
 				return 0; // Mado is immune to wind walk, cart boost, etc (others above) [Ind]
+			FALLTHROUGH
 		case SC_INC_AGI:
 			if (sc->data[SC_QUAGMIRE])
 				return 0;
@@ -7799,11 +7811,13 @@ int status_change_start(struct block_list *src, struct block_list *bl, enum sc_t
 			status_change_end(bl, SC_CONCENTRATION, INVALID_TIMER);
 			status_change_end(bl, SC_TRUESIGHT, INVALID_TIMER);
 			status_change_end(bl, SC_WINDWALK, INVALID_TIMER);
+			FALLTHROUGH
 			//Also blocks the ones below...
 		case SC_DEC_AGI:
 		case SC_ADORAMUS:
 			status_change_end(bl, SC_CARTBOOST, INVALID_TIMER);
 			//Also blocks the ones below...
+			FALLTHROUGH
 		case SC_DONTFORGETME:
 			status_change_end(bl, SC_INC_AGI, INVALID_TIMER);
 			status_change_end(bl, SC_ADRENALINE, INVALID_TIMER);
@@ -8124,6 +8138,7 @@ int status_change_start(struct block_list *src, struct block_list *bl, enum sc_t
 			case SC_LERADS_DEW:
 				if (sc && sc->data[SC_BERSERK])
 					return 0;
+				FALLTHROUGH
 			case SC_SHAPESHIFT:
 			case SC_PROPERTYWALK:
 				break;
@@ -8136,6 +8151,7 @@ int status_change_start(struct block_list *src, struct block_list *bl, enum sc_t
 				break;
 			case SC_JOINTBEAT:
 				val2 |= sce->val2; // stackable ailments
+				FALLTHROUGH
 			default:
 				if(sce->val1 > val1)
 					return 1; //Return true to not mess up skill animations. [Skotlex]
@@ -8149,6 +8165,7 @@ int status_change_start(struct block_list *src, struct block_list *bl, enum sc_t
 			case SC_ADORAMUS:
 				sc_start(src,bl,SC_BLIND,100,val1,skill->get_time(status->sc2skill(type),val1));
 				// Fall through to SC_INC_AGI
+				FALLTHROUGH
 			case SC_DEC_AGI:
 			case SC_INC_AGI:
 				val2 = 2 + val1; //Agi change
@@ -8232,6 +8249,7 @@ int status_change_start(struct block_list *src, struct block_list *bl, enum sc_t
 				break;
 			case SC_ENCHANTPOISON:
 				val2= 250+50*val1; //Poisoning Chance (2.5+0.5%) in 1/10000 rate
+				FALLTHROUGH
 			case SC_ASPERSIO:
 			case SC_PROPERTYFIRE:
 			case SC_PROPERTYWATER:
@@ -8738,6 +8756,7 @@ int status_change_start(struct block_list *src, struct block_list *bl, enum sc_t
 				switch (val1) {
 				case 3: //33*3 + 1 -> 100%
 					val2++;
+					FALLTHROUGH
 				case 1:
 				case 2: //33, 66%
 					val2 += 33*val1;
@@ -8818,6 +8837,7 @@ int status_change_start(struct block_list *src, struct block_list *bl, enum sc_t
 			case SC_ADRENALINE2:
 			case SC_ADRENALINE:
 				val3 = (val2) ? 300 : 200; // aspd increase
+				FALLTHROUGH
 			case SC_WEAPONPERFECT:
 				if(sd && pc->checkskill(sd,BS_HILTBINDING)>0)
 					tick += tick / 10;
@@ -9513,17 +9533,20 @@ int status_change_start(struct block_list *src, struct block_list *bl, enum sc_t
 			case SC_WILD_STORM:
 			case SC_UPHEAVAL:
 				val2 += 10;
+				FALLTHROUGH
 			case SC_HEATER:
 			case SC_COOLER:
 			case SC_BLAST:
 			case SC_CURSED_SOIL:
 				val2 += 10;
+				FALLTHROUGH
 			case SC_PYROTECHNIC:
 			case SC_AQUAPLAY:
 			case SC_GUST:
 			case SC_PETROLOGY:
 				val2 += 5;
 				val3 += 9000;
+				FALLTHROUGH
 			case SC_CIRCLE_OF_FIRE:
 			case SC_WATER_SCREEN:
 			case SC_WIND_STEP:
@@ -9605,6 +9628,7 @@ int status_change_start(struct block_list *src, struct block_list *bl, enum sc_t
 				break;
 			case SC_KAGEMUSYA:
 				val3 = val1 * 2;
+				FALLTHROUGH
 			case SC_IZAYOI:
 				val2 = tick/1000;
 				tick_time = 1000;
@@ -9911,14 +9935,17 @@ int status_change_start(struct block_list *src, struct block_list *bl, enum sc_t
 		case SC_DEEP_SLEEP:
 			if (sd && pc_issit(sd)) //Avoid sprite sync problems.
 				pc->setstand(sd);
+			FALLTHROUGH
 		case SC_TRICKDEAD:
 			status_change_end(bl, SC_DANCING, INVALID_TIMER);
 			// Cancel cast when get status [LuzZza]
 			if (battle_config.sc_castcancel&bl->type)
 				unit->skillcastcancel(bl, 0);
+			FALLTHROUGH
 		case SC_FALLENEMPIRE:
 		case SC_WHITEIMPRISON:
 			unit->stop_attack(bl);
+			FALLTHROUGH
 		case SC_STOP:
 		case SC_CONFUSION:
 		case SC_RG_CCONFINE_M:
@@ -10010,6 +10037,7 @@ int status_change_start(struct block_list *src, struct block_list *bl, enum sc_t
 				opt_flag = 0;
 				break;
 			}
+			FALLTHROUGH
 		case SC_EXPLOSIONSPIRITS:
 			sc->opt3 |= OPT3_EXPLOSIONSPIRITS;
 			opt_flag = 0;
@@ -10323,6 +10351,7 @@ int status_change_clear(struct block_list* bl, int type)
 					case SC_ARMOR_PROPERTY://Only when its Holy or Dark that it doesn't dispell on death
 						if( sc->data[i]->val2 != ELE_HOLY && sc->data[i]->val2 != ELE_DARK )
 							break;
+						FALLTHROUGH
 					default:
 						continue;
 				}
@@ -10403,6 +10432,7 @@ int status_change_end_(struct block_list* bl, enum sc_type type, int tid, const
 				//trigger when it also removed one
 				case SC_STONE:
 					sce->val3 = 0; //Petrify time counter.
+					FALLTHROUGH
 				case SC_FREEZE:
 				case SC_STUN:
 				case SC_SLEEP:
@@ -10971,6 +11001,7 @@ int status_change_end_(struct block_list* bl, enum sc_type type, int tid, const
 				opt_flag = 0;
 				break;
 			}
+			FALLTHROUGH
 		case SC_EXPLOSIONSPIRITS:
 			sc->opt3 &= ~OPT3_EXPLOSIONSPIRITS;
 			opt_flag = 0;
@@ -11256,6 +11287,7 @@ int status_change_timer(int tid, int64 tick, int id, intptr_t data)
 		case SC_POISON:
 			if(st->hp <= max(st->max_hp>>2, sce->val4)) //Stop damaging after 25% HP left.
 				break;
+			FALLTHROUGH
 		case SC_DPOISON:
 			if (--(sce->val3) > 0) {
 				if (!sc->data[SC_SLOWPOISON]) {
@@ -11386,6 +11418,7 @@ int status_change_timer(int tid, int64 tick, int id, intptr_t data)
 					//Moonlit's cost is 4sp*skill_lv [Skotlex]
 					sp= 4*(sce->val1>>16);
 					//Upkeep is also every 10 secs.
+					FALLTHROUGH
 				case DC_DONTFORGETME:
 					s=10;
 					break;