Re: another draft

Russ,

Looks good to me, send it.

Robb...


On Thu, 30 Dec 1999, Russ Rew wrote:

> Robb,
> 
> Thanks for the update.  I've appended the new draft, and I'm also
> copying Chiz, in case he can suggest any changes.  If I don't hear
> from you guys within about 15 minutes, I'll send it out to ldm-users
> and idd-relay.
> 
> Hi,
> 
> A copy of this notice is available at
> 
>   http://www.unidata.ucar.edu/packages/ldm/y2k-fix.html
> 
> Thanks to Al Taylor of NOAA's Air Resources Laboratory for being the
> first to report a Y2K bug in the pqact program of the LDM (all
> versions). The symptom of the bug is that pqact.conf entries that make
> use of two-digit year substitution patterns such as (\1:yy) will
> substitute the string "10" instead of the string "00" for products
> whose WMO header indicates a date in January or later.
> 
> For example, the pqact.conf entry 
> 
> WMO     ^S[AP][AC-Z][A-Z].* .... ([0-3][0-9])
>         FILE    data/obs/surface/hrly/(\1:yy)(\1:mm)\1.hrly
> 
> when presented with a matching product with a date component of 010212
> (representing 1200 on January 2) will append the product to a file
> with a name such as "100212.hrly" instead of the expected
> "000212.hrly".
> 
> A fix for the bug is to change line 643 in the source file
> ldm-5.0.8/src/pqact/palt.c from
> 
>                 (void) sprintf(ostring,"%d",year);
> 
> to 
> 
>                 (void) sprintf(ostring,"%02d", year % 100);
> 
> and then rebuild pqact and reinstall it. An already-patched version of
> the palt.c file is available from
> 
>   ftp://ftp.unidata.ucar.edu/pub/ldm5/palt.c.
> 
> To make it easier to install this bug fix, we have built new versions
> of pqact for all the common platforms for which we make binary
> distributions. You can just FTP the appropriate version of pqact for
> your platform and install it in /usr/local/ldm/bin/pqact (or wherever
> you have pqact installed). Below is a list of the available pqact
> binaries. Versions built for an earlier version of a platform, for
> example sunos_5.6-sparc, will generally work on later versions of the
> same platform such as sunos_5.7-sparc.
> 
>   ftp://ftp.unidata.ucar.edu/pub/binary/aix_4.3-rs6000/pqact
>   ftp://ftp.unidata.ucar.edu/pub/binary/hpux_10.20-hp9000/pqact
>   ftp://ftp.unidata.ucar.edu/pub/binary/hpux_11.00-hp9000/pqact
>   ftp://ftp.unidata.ucar.edu/pub/binary/irix64_6.5-mips/pqact
>   ftp://ftp.unidata.ucar.edu/pub/binary/irix_6.5-mips/pqact
>   ftp://ftp.unidata.ucar.edu/pub/binary/linux_2.2.5-i686/pqact
>   ftp://ftp.unidata.ucar.edu/pub/binary/osf1_4.0-alpha/pqact
>   ftp://ftp.unidata.ucar.edu/pub/binary/sunos_5.6-sparc/pqact
>   ftp://ftp.unidata.ucar.edu/pub/binary/sunos_5.7-i86pc/pqact
>   ftp://ftp.unidata.ucar.edu/pub/binary/sunos_5.7-sparc/pqact
> 
> If you have a platform for which none of these binaries is appropriate
> or if you need pqact built with the GDBM option, you will have to
> build a new version of pqact from source after making the one-line
> change above. Here's how to do that:
> 
> % cd ~ldm/runtime/src/pqact
> % mv palt.c palt.sav
> 
> Then copy the new palt.c to this directory. 
> 
> % make
> % cp pqact ~ldm/bin
> 
> We will be happy to assist with this and give top priority to any
> questions about this sent to address@hidden.
> 
> We're sorry for the inconvenience and the late notice on this bug, but
> it slipped by our testing.
> 

===============================================================================
Robb Kambic                                Unidata Program Center
Software Engineer III                      Univ. Corp for Atmospheric Research
address@hidden             WWW: http://www.unidata.ucar.edu/
===============================================================================