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From: alan@shodha.dec.com ( Alan's Home for Wayward Notes File.)
Newsgroups: comp.unix.ultrix,comp.unix.questions,comp.sys.dec
Subject: Re: IEEE<->DEC floating pt conversion wanted.
Summary: It's sort of there.
Keywords: IEEE to DEC, floating point conversion, float format, C routine
Message-ID: <391@shodha.dec.com>
Date: 24 Aug 89 16:35:33 GMT
References: <3741@ncsuvx.ncsu.edu>
Followup-To: comp.unix.ultrix
Distribution: usa
Organization: Digital Equipment Corp. - Colorado Springs, CO.
Lines: 36

In article <3741@ncsuvx.ncsu.edu>, brg@ecelet.ncsu.edu (Bennett Groshong) writes:
> I have a need to be able to convert data files containing floating
> point numbers (i.e. 32bit floats and 64bit doubles) between IEEE and
> DEC floating point format. *SOMEONE* has to have written this, yet
> neither I nor any of the wizards here can find such a routine.
> (I've searched the obvious newsgroups and the Ultrix doc.)

	If you have a DECstation or DECsystem there are a
	set of functions in the standard library for doing
	this conversion.  There isn't any documentation that
	I know of though.

	Some of the functions of interest are:

		dtoi - D Float to IEEE
		ftoi - F Float to IEEE
		itod - IEEE to D Float
		itof - IEEE to F Float

	There may also be a set for the G-Float format.  From little
	I've been able to divine they take a point pointer to the
	number and convert it in place.  If it fails it restores
	the original number and returns -1.

> 
> If this is in one of the std libraries/doc, consider me red-faced.
> 

	They're in the library, but without documentation or even
	a man page are hard to track down.

	I don't know whether or not these functions are supported.
	Check with the CSC if you have a support contract to see
	what they can find out.
-- 
Alan Rollow				alan%nabeth.dec.com@decwrl.dec.com