Types

You can use standard C types to define variables but MSXgl provide some shortcut that help to write short code and makes data size and sign explicit (which is so important for creating efficient code on a Z80).

MSXgl's types can be found in core.h.

Type	Desc.	SDCC equivalent	Min	Max
bool	Boolean (8 bits)	unsigned char	0	not 0
i8	8 bits signed integer	signed char	-128	127
u8	8 bits unsigned integer	unsigned char	0	255
i16	16 bits signed integer	signed short	-32768	32767
u16	16 bits unsigned integer	unsigned short	0	65535
i32	32 bits signed integer	signed long	-2,147,483,648	2,147,483,647
u32	32 bits unsigned integer	unsigned long	0	4,294,967,295
i64	64 bits signed integer	signed long long	-9,223,372,036,854,775,808	9,223,372,036,854,775,807
u64	64 bits unsigned integer	unsigned long long	0	18,446,744,073,709,551,615
f32	32 bits float (IEEE 754)	float	1,175494351e-38	3,402823466e+38
c8	8 bits character (ASCII, UTF-8)	unsigned char	0	255
c16	16 bits character (UTF-16, JIS, etc.)	unsigned short	0	65535
ptr	Pointer	void*	0x0000	0xFFFF
callback	Callback default signature	void (*)(void)

Related constants:

#define NULL	0	// Pointer "NULL" value
#define TRUE	1	// Value for "TRUE" boolean
#define FALSE	0	// Value for "FALSE" boolean

See also:

• Page about usage of boolean in MSXgl.
• SDCC documentation