Re: Re: [Linux-decnet-user] librms + vax floating point

[<ada...@br...>]

wow, thanks larry

in the meantime, i found the following function in the gcc sources (thats
not something i ever thought i'd say), i have no idea if it works and it
looks like i will have to hack it around and havnt tried ti yet....it looks
a bit crazy so it might just work, but i'll wait to se what you have....i'd
definitely say it would be a useful part of librms.

:o)

cheers

Adam

static void
decode_vax_f (const struct real_format *fmt ATTRIBUTE_UNUSED,
              REAL_VALUE_TYPE *r, const long *buf)
{
  unsigned long image = buf[0] & 0xffffffff;
  int exp = (image >> 7) & 0xff;

  memset (r, 0, sizeof (*r));

  if (exp != 0)
    {
      r->cl = rvc_normal;
      r->sign = (image >> 15) & 1;
      SET_REAL_EXP (r, exp - 128);

      image = ((image & 0x7f) << 16) | ((image >> 16) & 0xffff);
      r->sig[SIGSZ-1] = (image << (HOST_BITS_PER_LONG - 24)) | SIG_MSB;
    }
}


Larry Baker <lar...@st...> on 11/08/2005 08:01:59


To:         Adam R Pigg/Spent Fuel/Sellafield/BNFL@BNFL
cc:         Baker Larry <ba...@us...>

Fax to:
Subject:    Re: [Linux-decnet-user] librms + vax floating point


Adam,

I have a C library to read/write all VAX data formats.  I'll send it
to you when I get to work tomorrow.  If you recommend, I'll send it
to be a part of the linux-decnet distribution.

On Aug 10, 2005, at 6:39 AM, ada...@br... wrote:


>
> Hi
>
> im successfully using librms to open and read a binary file on a vax
> system.
>
> using '#pragma pack (1)' i was able to get my struct to be the same
> size as
> the record length of the file, and can read most of the data
> successfully,
> including strings and ints. But floats are a problem, they are totally
> wrong.  I figure vax maybe stores floats in a different format from
> my i386
> pc, and have found various references to things like
>
> vax 'D-Float' format
> and
> TARGET_FLOAT_FORMAT VAX_FLOAT_FORMAT  (but i think that is for cros
> compiling).
>
> Does anyone know how to manipuilate/read floats from a vax binary
> file?
>
> Cheers
>
> Adam
>
>
>
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Larry Baker
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650-329-5608
ba...@us...




Larry Baker
lar...@st...




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The information contained in this email may be commercially sensitive and/or legally privileged. It is intended solely for the person(s) to whom it is addressed. If you are not a named recipient, you are on notice of its status. Please notify the sender immediately by reply e-mail and then delete this message from your system. You must not disclose it to any other person, copy or distribute it or use it for any purpose.