[GRASS5] Recommended tweak for 5.1

[Michel Wurtz]

Markus Neteler wrote:
> 
> On Thu, Mar 29, 2001 at 09:24:40AM +0000, Michel Wurtz wrote:
> > Looks also good to me... in fact, this is how m.in.e00 was written :
> > the default location of the input file is "where you are" (i.e. pwd)
> > That's the default behaviour of the unix "open" function. You can also
> > use a relative path (input=foo/bar.e00) or an absolute path
> > (input=/tmp/bar.e00).  I really don't understand what you want to
> > change in m.in.e00...
> >
> > It's different for r.in.ascii or r.in.arc that use directories in
> > $LOCATION path, respectively $LOCATION/ascii and $LOCATION/arc.
> > BTW, you can use the same name for the binary and the ascii vector
> > file and both use $LOCATION/dig_att for the line's or area's attribute.
> > I think this was done because you need an ascii file for the import
> > or export of DXF files.
> 
> What about taking this chance and modifying the import modules to
> all using the unix "open" function? This v.in.dxf/2 etc. behaviour
> is quite inconvenient (and many users struggle here).
> I don't see much sense in keeping this oldish method and ignoring
> the unix "open" function.

In fact, i used fopen(), because it's more convenient (and probably
more effective) for reading/writing text data, but fopen() calls
open() and do some bufferisation as "extra".  The code looks like :

    fde00 = fopen (infile, "r");
    if (fde00 == NULL)
    {
	sprintf (msg, "%s - not found\n", infile);
	G_fatal_error (msg);
    }
Where "infile" is the parameter given as "input=...".  I think this
is the right way to do things...

By the way, what function (apart v.in.dxf and v.out.dxf) uses the ascii
vector format ?  If they are alone, we can also change v.[in|out].ascii
in order to store the ident attribute of lines and polygons in the same
file...

This could also lead to a complete rewrite of v.[in|out].dxf, because
you must use the vector library for input/output on grass side.
Probably a good idea, but it will take some time I have not yet !

--
Michel WURTZ - DIG - Maison de la télédétection
               500, rue J.F. Breton
               34093 MONTPELLIER Cedex 5

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