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Wayne Davison authored
The code now avoids any special internal meaning for uid/gid -1, which allows it to be mapped to a better value (use 4294967295 instead of -1 as the ID to map). Replaced atol() with something than can return a value > 0x7FFFFFFF and that will error-out if the value overflows. If chown() is called with a uid or gid of -1, complain that the ID is not settable and signal a transfer error. Fixes bug 6936.
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