2 files changed, 64 insertions, 4 deletions

diff --git a/src/CraftingRecipes.cpp b/src/CraftingRecipes.cpp
index 48178eecb..2d80ecaf8 100644
--- a/src/CraftingRecipes.cpp
+++ b/src/CraftingRecipes.cpp
@@ -392,8 +392,7 @@ void cCraftingRecipes::AddRecipeLine(int a_LineNum, const AString & a_RecipeLine
 	}
 	if (ResultSplit.size() > 1)
 	{
-		Recipe->m_Result.m_ItemCount = atoi(ResultSplit[1].c_str());
-		if (Recipe->m_Result.m_ItemCount == 0)
+		if (!StringToInteger<char>(ResultSplit[1].c_str(), Recipe->m_Result.m_ItemCount))
 		{
 			LOGWARNING("crafting.txt: line %d: Cannot parse result count, ignoring the recipe.", a_LineNum);
 			LOGINFO("Offending line: \"%s\"", a_RecipeLine.c_str());
@@ -445,8 +444,7 @@ bool cCraftingRecipes::ParseItem(const AString & a_String, cItem & a_Item)
 	if (Split.size() > 1)
 	{
 		AString Damage = TrimString(Split[1]);
-		a_Item.m_ItemDamage = atoi(Damage.c_str());
-		if ((a_Item.m_ItemDamage == 0) && (Damage.compare("0") != 0))
+		if (!StringToInteger<short>(Damage.c_str(), a_Item.m_ItemDamage))
 		{
 			// Parsing the number failed
 			return false;
diff --git a/src/StringUtils.h b/src/StringUtils.h
index 142aaf59b..56ac83942 100644
--- a/src/StringUtils.h
+++ b/src/StringUtils.h
@@ -99,6 +99,68 @@ extern int GetBEInt(const char * a_Mem);
 /// Writes four bytes to the specified memory location so that they interpret as BigEndian int
 extern void SetBEInt(char * a_Mem, Int32 a_Value);
 
+/// Parses any integer type. Checks bounds and 
+template<class T>
+bool StringToInteger(AString a_str, T& a_Num)
+{
+	size_t i = 0;
+	T positive = true;
+	T result = 0;
+	if (a_str[0] == '+')
+	{
+		i++;
+	}
+	else if (a_str[0] == '-')
+	{
+		i++;
+		positive = false;
+	}
+	if (positive)
+	{
+		for(; i <= a_str.size(); i++)
+		{
+			if ((a_str[i] <= '0') || (a_str[i] >= '9'))
+			{
+				return false;
+			}
+			if (std::numeric_limits<T>::max() / 10 < result)
+			{
+				return false;
+			}
+			result *= 10;
+			T digit = a_str[i] - '0';
+			if (std::numeric_limits<T>::max() - digit < result)
+			{
+				return false;
+			}
+			result += digit;
+		}
+	}
+	else
+	{
+		for(; i <= a_str.size(); i++)
+		{
+			if ((a_str[i] <= '0') || (a_str[i] >= '9'))
+			{
+				return false;
+			}
+			if (std::numeric_limits<T>::min() / 10 > result)
+			{
+				return false;
+			}
+			result *= 10;
+			T digit = a_str[i] - '0';
+			if (std::numeric_limits<T>::min() + digit > result)
+			{
+				return false;
+			}
+			result -= digit;
+		}
+	}
+	a_Num = result;
+	return true;
+}
+
 // If you have any other string helper functions, declare them here