Replace _fullpath with Linux equivalent

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C++

Linux

DOS

I have the following code inherited from a c++ DOS file.

_fullpath ( audit_log , filename , 256 ) ;

I need to replace this code so that I can compile in g++ for Linux and found function realpath so intend to make following replacement:

realpath( filename , audit_log );

Can I confirm that:

1. The first two inputs should indeed be reversed.

2. Is there an easy way to specify buffer length of 256 in the realpath function? I think I'm getting errors associated with buffer length using realpath.