Fixed droprate overflows when going over rate 2000x

git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@11966 54d463be-8e91-2dee-dedb-b68131a5f0ec

Changelog-Trunk.txt

@@ -4,6 +4,7 @@ AS OF SVN REV. 5091, WE ARE NOW USING TRUNK.  ALL UNTESTED BUGFIXES/FEATURES GO
 IF YOU HAVE A WORKING AND TESTED BUGFIX PUT IT INTO STABLE AS WELL AS TRUNK.
 
 2007/12/22
+	* Fixed droprate overflows when going over rate 2000x [ultramage]
 	* Corrected mob spawn utilization of the delay1/delay2 values (one is
 	  respawn delay base, the second is random variance added on top of it).
 	  Cleaned up related code. [Skotlex]

src/map/mob.c

@@ -3178,16 +3178,19 @@ static int mob_makedummymobdb(int class_)
 }
 
 //Adjusts the drop rate of item according to the criteria given. [Skotlex]
-static unsigned int mob_drop_adjust(int rate, int rate_adjust, unsigned short rate_min, unsigned short rate_max)
+static unsigned int mob_drop_adjust(int baserate, int rate_adjust, unsigned short rate_min, unsigned short rate_max)
 {
+	double rate = baserate;
+
 	if (battle_config.logarithmic_drops && rate_adjust > 0) //Logarithmic drops equation by Ishizu-Chan
 		//Equation: Droprate(x,y) = x * (5 - log(x)) ^ (ln(y) / ln(5))
 		//x is the normal Droprate, y is the Modificator.
-		rate = (int)(rate * pow((5.0 - log10(rate)), (log(rate_adjust/100.) / log(5.0))) + 0.5);
+		rate = rate * pow((5.0 - log10(rate)), (log(rate_adjust/100.) / log(5.0))) + 0.5;
 	else
 		//Classical linear rate adjustment.
 		rate = rate * rate_adjust/100;
-	return cap_value(rate,rate_min,rate_max);
+
+	return (unsigned int)cap_value(rate,rate_min,rate_max);
 }
 
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