; $Id: cdf_exists.pro,v 1.4.6.1 1999/01/16 16:37:40 scottm Exp $
;
;
; Copyright (c) 1992-1999, Research Systems, Inc.  All rights reserved.
;	Unauthorized reproduction prohibited.
;
;+
; NAME:
;	CDF_EXISTS
;
; PURPOSE:
;	Test for the existence of the CDF library
;
; CATEGORY:
;	File Formats
;
; CALLING SEQUENCE:
;	Result = CDF_EXISTS()
;
; INPUTS:
;	None.
;
; KEYWORD PARAMETERS:
;	None.
;
; OUTPUTS:
;	Returns TRUE (1) if the CDF data format library is
;	supported. Returns FALSE(0) if it is not.
;
; EXAMPLE:
;	IF cdf_exists() EQ 0 THEN Fail,"CDF not supported on this machine"
;
; MODIFICATION HISTORY
;	Written by:	Joshua Goldstein,  12/8/92
;
;-

;	A fake function if libraries don't exist
FUNCTION cdf_inquire,x
	return,0
END

;
FUNCTION cdf_exists
	; CDF is not available in the IDL Student Edition
	;
	; NOTE: The LMGR function is undocumented, considered private
	; to RSI, and is subject to change or removal from IDL at any
	; time without notice.
	if (LMGR(/STUDENT) eq 1) then return, 0

	on_ioerror, ok
	oldquiet= !quiet
	!quiet=1

	x=cdf_inquire(0)
	!quiet=oldquiet
	return,0

   ok:
	!quiet=oldquiet
	return,1
END