[GRASS-dev] Segment library zero filling

[Vaclav Petras]

Hi MarkusM and all,

I'm trying to understand if the Segment_open() [1] function fills with
zeros or not. I don't think it does since it is calling G_malloc (malloc)
or Segment_format_nofill(). However, it is not completely clear to me what
is supposed to be doing because documentation still says it calls
Segment_format() and I don't understand context of the related commit [2,
3] and the usage of lseek and USE_LSEEK are not clear to me from format.c
[4].

Markus, can you please clarify that for me? I will then update the
documentation with whatever is needed.

Thanks,
Vaclav

[1]
https://grass.osgeo.org/programming7/segment_2open_8c.html#ae24d2e794c66c0512b67d7cea8b2ba9a
[2]
https://github.com/OSGeo/grass/commit/7a0d8d749537acd6d5c4baea11dbb6167fdef916
[3] https://trac.osgeo.org/grass/changeset/73268
[4] https://github.com/OSGeo/grass/blob/master/lib/segment/format.c
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