That, unfortunately, is too convoluted to figure out without real study. Without a clear example, I simply find the full, real path of the executable and presume that the standard ../share/${program}/ is correct. Probably an illuminating example would make life easier..... :-)
If a GPL'd solution is OK, I recommend libiberty. I moved GCC's make_relative_prefix into libiberty some time ago because I kept needing this functionality elsewhere.
You give it argv[0], BINDIR, and OTHERDIR; it computes the relative path between bindir and otherdir, finds your application in $PATH or similar, and works out the likely location of otherdir.
Similar code is currently embedded in libtool in order to support wrappers for executables under Cygwin. The code should be portable.
Bob ====================================== Bob Friesenhahn bfriesen@xxxxxxxxxxxxxxxxxxx http://www.simplesystems.org/users/bfriesen
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