From: dwells (Don Wells)
To: dwells
Subject: ieee-VAX
Date: Mon, 2 Oct 89 10:05:10 EDT

Path: hudson!uvaarpa!haven!uflorida!ukma!husc6!rice!sun-spots-request
From: bimbo!boyter@uunet.uu.net (Maj Brian Boyter)
Newsgroups: comp.sys.sun
Subject: Re: VAX real number conversion programs
Keywords: Source
Message-ID: <1833@brazos.Rice.edu>
Date: 29 Sep 89 00:40:43 GMT
Sender: root@rice.edu
Organization: Sun-Spots
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Approved: Sun-Spots@rice.edu
X-Sun-Spots-Digest: Volume 8, Issue 147, message 3 of 8

In article <1763@brazos.Rice.edu>, dinah@nicolle.bcm.tmc.edu (Dinah Anderson) writes:
> Does anyone know where there is a program to convert VAX real*2 and real*4
> data files into a format the Sun can read? Thanks.

I got this code orginially from bsabata@cs.utexas.edu....
I have modified it somewhat....

/* routine that converts the vax floating point numbers to
   RT/IEEE floating point format */

float
vfloat(vax)
float vax;
{
	union {
		char bytes[4];
		float flt;
		struct {
			unsigned int sign:1;
			unsigned int exp:8;
			unsigned int mant:23;
		} f;
	} ieee;
	union {
		float flt;
		char bytes[4];
	} vaxx;

/* swap bytes */
	vaxx.flt = vax;
	ieee.bytes[0] = vaxx.bytes[1];
	ieee.bytes[1] = vaxx.bytes[0];
	ieee.bytes[2] = vaxx.bytes[3];
	ieee.bytes[3] = vaxx.bytes[2];

/* adjust exponent */
	if( ieee.f.exp < 2)
		ieee.flt = 0.0;	 /* underflows */
	  else ieee.f.exp -= 2;

	return(ieee.flt);
}

   Maj. Brian A Boyter
   US Army Foreign Science & Technology Center
   Charlottesville, Va 22901                         __
   off: (804)980-7362                              (    )
   home:     973-9440                             {      }
   boyter%bimbo.uucp@virginia.acc.virginia.edu     (    )
                                                     ||
   Nuke'm 'till they glow                            ||
   ...Then shoot'm in the dark              ________<  >_______