.MACRO	DSDDEF,DEV,UIC,FNAM,<OPTARG>
 
;	This macro defines a data-set descriptor for		;
;	FCS. The arguments are:					;
 
;	DEV   -  Label to associate with the device name	;
;		 buffer						;
;	UIC   -  Label to associate with the UIC name		;
;		 buffer.					;
;	FNAM  -  Label to associate with the File name		;
;		 buffer.					;
 
;	The following arguments are optional. They are		;
;	used only to initialize the above three buffers		;
;	with ASCII strings.					;
;	The dataset descriptor table will be updated according	;
;	to these values.					;
 
;	Note : the maximum length of all labels must be		;
;	       5 characters due to MACRO-11's six character	;
;	       name and label restriction. This macro uses	;
;	       the specified names to generate length labels	;
;	       as required.					;
 
	.IF	B	DEV
..PC1=.
	.WORD	0,0			; Device entry		;
	.IFF
..PC1=.
	.WORD	0,DEV			; Device entry		;
	.ENDC
 
	.IF	B	UIC
..PC2=.	
	.WORD	0,0			; UIC entry		;
	.IFF
..PC2=.
	.WORD	0,UIC			; UIC entry		;
	.ENDC
 
	.IF	B	FNAM	
..PC3=.
	.WORD	0,0			; File name entry	;
	.IFF
..PC3=.
	.WORD	0,FNAM			; File name entry	;
	.ENDC
 
	..NARG=0
	.IRP	x,<OPTARG>
	..NARG=..NARG+1
	.ENDR

	.ENDM	DSDDEF