From 0078db6a30bf824afffa9430df97bc7e5c955c83 Mon Sep 17 00:00:00 2001
From: skotlex <skotlex@54d463be-8e91-2dee-dedb-b68131a5f0ec>
Date: Tue, 7 Mar 2006 19:59:57 +0000
Subject: [PATCH] - Some overflow protections on calculation of max hp. Now
 when max hp becomes negative, it is bumped to the server's max_hp setting (it
 is assumed there was an overflow)

git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@5493 54d463be-8e91-2dee-dedb-b68131a5f0ec
---
 Changelog-Trunk.txt |  4 ++++
 src/map/status.c    | 17 +++++++++++++----
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/Changelog-Trunk.txt b/Changelog-Trunk.txt
index 45760a47fc..fc5962ac1a 100644
--- a/Changelog-Trunk.txt
+++ b/Changelog-Trunk.txt
@@ -5,6 +5,10 @@ IF YOU HAVE A WORKING AND TESTED BUGFIX PUT IT INTO STABLE AS WELL AS TRUNK.  EV
 GOES INTO TRUNK AND WILL BE MERGED INTO STABLE BY VALARIS AND WIZPUTER. -- VALARIS
 
 2006/03/07
+	* status_calc_pc now assumes that if your max hp is negative, it has
+	  overflowed, and as such, it is set to the max_hp setting instead of 1. This
+	  'dangerous' assumptio is alright as long as there aren't equipment that can
+	  send your hp to negative values. [Skotlex]
 	- Fixed the soul linker skill tree. (Thanks to muad_dib) [Zephiris]
 	* Added Gunslinger and Ninja into @job. of course, you need latest EXE
 	  for make this work... and of course no skills yet! [Vicious]
diff --git a/src/map/status.c b/src/map/status.c
index 3e0c844f5f..23a4db4a87 100644
--- a/src/map/status.c
+++ b/src/map/status.c
@@ -7,6 +7,7 @@
 #include <stdlib.h>
 #include <memory.h>
 #include <string.h>
+#include <limits.h>
 
 #include "pc.h"
 #include "map.h"
@@ -1374,11 +1375,14 @@ int status_calc_pc(struct map_session_data* sd,int first)
 		sd->status.max_hp = sd->status.max_hp * sd->hprate/100;
 	if(battle_config.hp_rate != 100)
 		sd->status.max_hp = sd->status.max_hp * battle_config.hp_rate/100;
-
-	if(sd->status.max_hp > battle_config.max_hp)
+	
+	if (sd->status.max_hp < 0) //HP overflow??
 		sd->status.max_hp = battle_config.max_hp;
-	else if(sd->status.max_hp <= 0)
+	else if(sd->status.max_hp > battle_config.max_hp)
+		sd->status.max_hp = battle_config.max_hp;
+	else if(sd->status.max_hp == 0)
 		sd->status.max_hp = 1;
+	
 	if(sd->status.hp>sd->status.max_hp)
 		sd->status.hp=sd->status.max_hp;
 
@@ -5623,7 +5627,8 @@ int status_change_clear_debuffs (struct block_list *bl)
 
 static int status_calc_sigma(void)
 {
-	int i,j,k;
+	int i,j;
+	unsigned int k;
 
 	for(i=0;i<MAX_PC_CLASS;i++) {
 		memset(hp_sigma_val[i],0,sizeof(hp_sigma_val[i]));
@@ -5631,7 +5636,11 @@ static int status_calc_sigma(void)
 			k += hp_coefficient[i]*j + 50;
 			k -= k%100;
 			hp_sigma_val[i][j-1] = k;
+			if (k >= INT_MAX)
+				break; //Overflow protection. [Skotlex]
 		}
+		for(;j<=MAX_LEVEL;j++)
+			hp_sigma_val[i][j-1] = INT_MAX;
 	}
 	return 0;
 }