Side note -- later, when testing the new feature on multiple operating systems, it broke on NetBSD because one of the hard-coded parameters needed to dynamically adjust to the right value for each type of system.
The NetBSD manuals recommend "fts_*" over "nftw", with this to say about the "fts" functions:
"The fts utility was expected to be included in the IEEE Std 1003.1-1988 ("POSIX.1") revision. But twenty years later, it still was not included in the IEEE Std 1003.1-2008 ("POSIX.1") revision."
So I probably could have just done what "du" does, after all. But I learned a small piece of history, and the new code is still much shorter and simpler than it would have otherwise been.
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