[Geocoding] support tab as space delimiter #967

[Rahul Reddy]

Thanks for the reply!

I took some time to understand the utfasciitable.h and nominatim.c in the path module/. The entries are already such that ASCII 9-14 will be converted to space character.

But the resultant string does not contain the character. This happens with other characters like @#+() etc.(these are irrelevant in search) too.

I think the part
'// assume lenngth 1, silently drop bogus characters'
in nominatim.c is dropping these characters. Can anyone help me with this?

PS: While trying to understand the table, I fixed issue #886<https://github.com/openstreetmap/Nominatim/issues/886>. I'll write test cases and send a PR for that.
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