[Bug 190735] truncate(1) integer overflow issues with size command line arg -- diff with unit tests attached

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=190735

Jilles Tjoelker <jilles at FreeBSD.org> changed:

           What    |Removed                     |Added
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             Status|Needs Triage                |In Discussion
                 CC|                            |jilles at FreeBSD.org

--- Comment #1 from Jilles Tjoelker <jilles at FreeBSD.org> ---
This looks useful.

Is it possible to do without the new undocumented -D option? Perhaps you could
ktrace for truncate(2) calls or add numbers to error messages. (A truncate() to
something close to OFF_MAX should certainly not be expected to work, so
checking for sizes of files may not be sufficient.)

Instead of the PRIdMAX macro from <inttypes.h>, please use "jd".

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