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rs: Fix some pointer arith UB.
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Authored by jhb on Sep 29 2022, 10:47 PM.
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Details

Summary

If the next column was blank, then the length of the following entry
was computed as the end of the following entry minus a global variable
"blank" which is not in the same string or allocation. Instead, save
the start value of 'p' explicitly instead of abusing '*ep'. Possibly
we should just increment p before saving it in sp in the 'blank' case,
but at worst that would just mean maxlen might be one char too large
which should be harmless.

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rG FreeBSD src repository
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