[GRASS-dev] diglib test.c fails on 64bit win

Glynn Clements glynn at gclements.plus.com
Thu May 20 12:26:44 EDT 2010

Markus Metz wrote:

> At least clean_temp, d.font, g.mkfontcap, g.access need stat(), no way
> to replace that with a more portable version to get time and/or mode?

The most common use of st_mode is to determine whether the name refers
to a file or to a directory. That could be replaced by e.g. 
G_is_file() and G_is_directory().

g.access actually uses the permissions. G_recursive_copy() reads the
permissions to copy them to the new file. G_rc_path() checks that the
permissions are sufficient. No idea how well any of this works on

> >> In these cases, stat() could be
> >> replaced in trunk with
> >
> >> curr_pos = G_ftell(fp)
> >> G_fseek(fp, 0, SEEK_END)
> >> filesize = G_ftell(fp)
> >> G_fseek(fp, curr_pos, SEEK_SET)
> >>
> >> something like that is done e.g. in lib/vector/Vlib/open.c (all branches)
> >
> > That's an option if the file is already open (and has the advantage
> > that it works with open files on Windows, which stat() doesn't; see
> > #1006). I'd be inclined to add a version using a file descriptor.
> Leave all that to a new "off_t G_file_size()" ?

That's fine if the file is open (or would be opened before the size is
required). There may be cases where code needs the size of a file but
has reasons to avoid opening it.

Regardless of whatever utility functions we create, I think that we
still need to provide a portable stat() interface which handles LFS.

Glynn Clements <glynn at gclements.plus.com>

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