[GRASS5] src/libes/gis/ new function G_is_little_endian()

[Markus Neteler]

Radim,

On Mon, Jan 15, 2001 at 07:15:36PM +0100, Radim Blazek wrote:
> Markus Neteler wrote:
> > Hi all,
> > 
> > as it is used in various places in GRASS, I have added
> > G_is_little_endian() function to test little/big endianess
> > in
> > src/libes/gis/endian.c
> > (GISLIB)
> > 
> >  *****************************************************************
> >  * endian test
> >  *
> >  * G_is_little_endian ()
> >  *
> >  * Test if machine is little or big endian (required for file coding)
> >  *
> >  * Returns: 1 little endian
> >  *          0 big endian
> > 
> > I have updated to src/libes/ogsf/ accordingly (NVIZ is affected).
> > Seems to work well.
> > 
> > Maybe this test is useful for the new vect-lib?
> 
> At least in theory third 'PDP'(3412) byte order exists.
> I have defined in new include/vect/dig_vect.h
> #define ENDIAN_LITTLE 0                                                             
> #define ENDIAN_BIG    1                                                             
> #define ENDIAN_OTHER  2
> (LITTLE_ENDIAN, ... is already used in /usr/include/endian.h)
> If you have written that function we could move that definition
> into gis.h. Maybe G_get_byte_order() would be better. 

Sounds good to me. If you would like to change that in
src/libes/gis/endian.c

then I will update the related modules. I wasn't aware of
/usr/include/endian.h, sorry.
 
> In new vect lib test_port program exists which is compiled and run
> during compilation and writes out new header file where byte order 
> is defined (for each type). That is useful because you can use
> #if BYTE_ORDER == ENDIAN_LITTLE
> and speed is increased.
fine.

> We should probably add before (new) constants defined in grass
> some prefix (GR_, GRASS_) to be sure that conflicts cannot appear?
> (As used in other libes: G_, TK_, SQL_)
Yes, that's important. We need an agreement here (hi software engineers)

 Markus

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