portable realpath

[Antonio Sun]

Hi,

Anyone knows a portable way to get realpath, ie, the canonical file name of
a symbolic link?

Both GNU Linux and NetBSD seem to support 'readlink -f', but the '-f' will
fail in FreeBSD, v8.2-RELEASE-p4 at least.

Any suggestions?

PS. 'readlink -f', will canonicalize by  following  every symlink in every
component of the given name recursively.

Thanks

Antonio
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