find at runtime where LibreOffice is being executed from

[Lionel Elie Mamane]

Hi,

Does anybody have an idea how we can determine at runtime where the
LibreOffice installation root is?

The difficulty we are having with firebird is that is needs to find a
"security3.fdb" file. So we put it in instdir/share/ and we want
firebird to look there.

But now, when running from the instdir in the source dir, that will be
something like

 /home/username/sources/libreoffice/.../instdir/share

but after a "real" installation the exact same binary will be in
something like

 /opt/libreoffice5.3/share
 /usr/lib/libreoffice
 /usr/local/lib/libreoffice

So we need to determine at _runtime_ where LibreOffice is being run
from... I see that the "soffice" script has a "sd_prog" variable; if
we just export it, we could use that, something like the
concatenation of getenv("sd_prog") and "../share/".

Is it OK if we do that? Will it work on other platforms than Unixy
systems? Is there already another mechanism to achieve the same result
in LibreOffice that I don't know about?

Thanks in advance,

Lionel