;
;	File:		EndianAware.a
;
;	Contains:	macros for 68K clients that are aware of platform endian-ness
;
;	Written by:	Craig Prouse
;
;	Copyright:	© 1993 by Apple Computer, Inc., all rights reserved.
;
;	Change History (most recent first):
;
;		 <1>	11/10/93	fau		first checked in
;
;

			IF (&TYPE('__INCLUDINGENDIANAWARE__') = 'UNDEFINED') THEN
__INCLUDINGENDIANAWARE__	SET	1

			IF &TYPE('littleEndian') = 'UNDEFINED' THEN
littleEndian	SET		1
			ENDIF


;	……………………………………………………………………………………………………………………………………………………………………………………………………………………
;	ENDSW (pseudo-instruction)
;
;	Operation:		(Size = Byte)	None
;					(Size = Word)	Dn[8:15] <-> Dn[7:0]
;					(Size = Long)	Dn[31:24] <-> Dn[7:0]; Dn[23:16] <-> Dn[15:8]
;
;	Syntax:			ENDSW Dn
;
;	Attributes:		Size = (Byte, Word, Long)
;
;	Description:	Exchange bytes within a word or longword to convert between
;					big-endian and little-endian representations.
;
;	CCR:			Undefined
;	……………………………………………………………………………………………………………………………………………………………………………………………………………………

				MACRO
				ENDSW.&size	&Dn

			IF &UC(&size) = 'L' OR &UC(&size) = 'W' OR &UC(&size) = 'B' OR &size = '' THEN

			IF littleEndian THEN
			IF &UC(&size) <> 'B' THEN
				rol.w	#8,&Dn
			ENDIF								; Size <> Byte
			IF &UC(&size) = 'L' THEN
				swap	&Dn
				rol.w	#8,&Dn
			ENDIF								; Size = Long
			ENDIF								; littleEndian

			ELSE
				AERROR	(&CONCAT('''',&UC(&size),''' is an invalid operand size for ENDSW'))

			ENDIF								; Size = B | W | L

				ENDM


			ENDIF								; __INCLUDINGENDIANAWARE__