Pull header reading code into libdwP.h

tbaeder@redhat.com tbaeder@redhat.com
Tue Feb 9 11:45:06 GMT 2021

There is quite a bit of code duplication between src/readelf.c and
libdw/dwarf_getsrclines.c when parsing header_length, unit_length, etc.

Pull the code out into libdwP.h and use it in both of those files.

It doesn't save a much code as I'd hoped and I'm not sure about the
naming, but here's the patch.


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