// Sets up common environment for Shay Green's libraries.
//
// To change configuration options, modify blargg_config.h, not this file.

#ifndef BLARGG_COMMON_H
#define BLARGG_COMMON_H

#include <stddef.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>

// User configuration (allow it to #include "blargg_common.h" normally)
#undef BLARGG_COMMON_H
#include "blargg_config.h"
#define BLARGG_COMMON_H

/* BLARGG_COMPILER_HAS_BOOL: If 0, provides bool support for old compiler. If 1,
   compiler is assumed to support bool. If undefined, availability is determined.
   If errors occur here, add the following line to your config.h file:
	#define BLARGG_COMPILER_HAS_BOOL 1
*/
#ifndef BLARGG_COMPILER_HAS_BOOL
	#if defined (__MWERKS__)
		#if !__option(bool)
			#define BLARGG_COMPILER_HAS_BOOL 0
		#endif
	#elif defined (_MSC_VER)
		#if _MSC_VER < 1100
			#define BLARGG_COMPILER_HAS_BOOL 0
		#endif
	#elif defined (__GNUC__)
		// supports bool
	#elif __cplusplus < 199711
		#define BLARGG_COMPILER_HAS_BOOL 0
	#endif
#endif
#if defined (BLARGG_COMPILER_HAS_BOOL) && !BLARGG_COMPILER_HAS_BOOL
	typedef int bool;
	const bool true  = 1;
	const bool false = 0;
#endif

// BLARGG_NEW is used in place of 'new' to create objects. By default, plain new is used.
// To prevent an exception if out of memory, #define BLARGG_NEW new (std::nothrow)
#ifndef BLARGG_NEW
	#define BLARGG_NEW new
#endif

// BOOST::int8_t etc.

// HAVE_STDINT_H: If defined, use <stdint.h> for int8_t etc.
#if defined (HAVE_STDINT_H)
	#include <stdint.h>
	#define BOOST

// HAVE_INTTYPES_H: If defined, use <stdint.h> for int8_t etc.
#elif defined (HAVE_INTTYPES_H)
	#include <inttypes.h>
	#define BOOST

#else
	struct BOOST
	{
		#if UCHAR_MAX == 0xFF && SCHAR_MAX == 0x7F
			typedef signed char     int8_t;
			typedef unsigned char   uint8_t;
		#else
			// No suitable 8-bit type available
			typedef struct see_blargg_common_h int8_t;
			typedef struct see_blargg_common_h uint8_t;
		#endif
		
		#if USHRT_MAX == 0xFFFF
			typedef short           int16_t;
			typedef unsigned short  uint16_t;
		#else
			// No suitable 16-bit type available
			typedef struct see_blargg_common_h int16_t;
			typedef struct see_blargg_common_h uint16_t;
		#endif
		
		#if ULONG_MAX == 0xFFFFFFFF
			typedef long            int32_t;
			typedef unsigned long   uint32_t;
		#elif UINT_MAX == 0xFFFFFFFF
			typedef int             int32_t;
			typedef unsigned int    uint32_t;
		#else
			// No suitable 32-bit type available
			typedef struct see_blargg_common_h int32_t;
			typedef struct see_blargg_common_h uint32_t;
		#endif
	};
#endif

#ifdef _WIN32
typedef wchar_t blargg_wchar_t;
#else
#include <stdint.h>
typedef uint16_t blargg_wchar_t;
#endif

// BOOST_STATIC_ASSERT( expr ): Generates compile error if expr is 0.
#ifndef BOOST_STATIC_ASSERT
	#ifdef _MSC_VER
		// MSVC6 (_MSC_VER < 1300) fails for use of __LINE__ when /Zl is specified
		#define BOOST_STATIC_ASSERT( expr ) \
			void blargg_failed_( int (*arg) [2 / !!(expr) - 1] )
	#else
		// Some other compilers fail when declaring same function multiple times in class,
		// so differentiate them by line
		#define BOOST_STATIC_ASSERT( expr ) \
			void blargg_failed_( int (*arg) [2 / !!(expr) - 1] [__LINE__] )
	#endif
#endif

// In case compiler doesn't support these properly. Used rarely.
#define STATIC_CAST(T,expr) static_cast<T> (expr)
#define CONST_CAST( T,expr) const_cast<T> (expr)

// blargg_err_t (0 on success, otherwise error string)
#ifndef blargg_err_t
	typedef const char* blargg_err_t;
#endif

// Success; no error
blargg_err_t const blargg_ok = 0;

/* Pure virtual functions cause a vtable entry to a "called pure virtual"
error handler, requiring linkage to the C++ runtime library. This macro is
used in place of the "= 0", and simply expands to its argument. During
development, it expands to "= 0", allowing detection of missing overrides. */
#define BLARGG_PURE( def ) def

/* My code is not written with exceptions in mind, so either uses new (nothrow)
OR overrides operator new in my classes. The former is best since clients
creating objects will get standard exceptions on failure, but that causes it
to require the standard C++ library. So, when the client is using the C
interface, I override operator new to use malloc. */

// BLARGG_DISABLE_NOTHROW is put inside classes
#ifndef BLARGG_DISABLE_NOTHROW
	// throw spec mandatory in ISO C++ if NULL can be returned
	#if __cplusplus >= 199711 || __GNUC__ >= 3 || _MSC_VER >= 1300
		#define BLARGG_THROWS_NOTHING throw ()
	#else
		#define BLARGG_THROWS_NOTHING
	#endif

	#define BLARGG_DISABLE_NOTHROW \
		void* operator new ( size_t s ) BLARGG_THROWS_NOTHING { return malloc( s ); }\
		void operator delete( void* p ) BLARGG_THROWS_NOTHING { free( p ); }

	#define BLARGG_NEW new
#else
	// BLARGG_NEW is used in place of new in library code
	#include <new>
	#define BLARGG_NEW new (std::nothrow)
#endif

#endif