Florian Larysch 2a6c5bb0c4 modeline: Handle version number overflow. #5450 ...

Closes #5449

A file containing the string "vim" followed by a very large number in a modeline
location will trigger an overflow in getdigits() which is called by
chk_modeline() when trying to parse the version number.

Add getdigits_safe(), which does not assert overflows, but reports them to the
caller.

2016-10-26 13:05:25 +02:00

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