impl a couple more util.cc functions

src/common.hh

@@ -134,6 +134,8 @@ void SetErrorFunction(TErrorFunction *Function);
 void SetPrintFunction(TPrintFunction *Function);
 void error(const char *Text, ...) ATTR_PRINTF(1, 2);
 void print(int Level, const char *Text, ...) ATTR_PRINTF(2, 3);
+int random(int Min, int Max);
+bool FileExists(const char *FileName);
 
 bool isSpace(int c);
 bool isAlpha(int c);
@@ -147,6 +149,22 @@ int stricmp(const char *s1, const char *s2, int Max = INT_MAX);
 char *findFirst(char *s, char c);
 char *findLast(char *s, char c);
 
+template<typename T>
+void RandomShuffle(T *Buffer, int Size){
+	if(Buffer == NULL){
+		error("RandomShuffle: Buffer ist NULL.\n");
+		return;
+	}
+
+	int Max = Size - 1;
+	for(int Min = 0; Min < Max; Min += 1){
+		int Swap = random(Min, Max);
+		if(Swap != Min){
+			std::swap(Buffer[Min], Buffer[Swap]);
+		}
+	}
+}
+
 struct TReadStream {
 	// VIRTUAL FUNCTIONS
 	// =========================================================================

src/stubs.hh

@@ -26,7 +26,6 @@ extern void CronExpire(Object Obj, int Delay);
 extern uint32 CronInfo(Object Obj, bool Delete);
 extern uint32 CronStop(Object Obj);
 extern void DeleteDynamicString(uint32 Number);
-extern bool FileExists(const char *FileName);
 extern TCreature *GetCreature(uint32 CreatureID);
 extern const char *GetDynamicString(uint32 Number);
 extern TConnection *GetFirstConnection(void);

src/util.cc

@@ -1,5 +1,7 @@
 #include "common.hh"
 
+#include <sys/stat.h>
+
 static void (*ErrorFunction)(const char *Text) = NULL;
 static void (*PrintFunction)(int Level, const char *Text) = NULL;
 
@@ -41,6 +43,27 @@ void print(int Level, const char *Text, ...){
 	}
 }
 
+int random(int Min, int Max){
+	int Range = (Max - Min) + 1;
+	int Result = Min;
+	if(Range > 0){
+		Result += rand() % Range;
+	}
+	return Result;
+}
+
+bool FileExists(const char *FileName){
+	struct stat Buffer;
+	bool Result = true;
+	if(stat(FileName, &Buffer) != 0){
+		if(errno != ENOENT){
+			error("FileExists: Unerwarteter Fehlercode %d.\n", errno);
+		}
+		Result = false;
+	}
+	return Result;
+}
+
 // String Utility
 // =============================================================================
 bool isSpace(int c){