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author	David Mitchell <davem@iabyn.com>
	Tue, 30 May 2017 14:55:29 +0000 (15:55 +0100)
committer	David Mitchell <davem@iabyn.com>
	Wed, 7 Jun 2017 08:11:07 +0000 (09:11 +0100)
commit	1cf776efbdf4c0ec9c63db594557fb05e588123e
tree	accb9f27cb18b3f3327484c2dd721d71f6973ba2	tree \| snapshot
parent	8a015f6ec969acd841529dbca037e9fc0e3046a4	commit \| diff

Perl_sv_vcatpvfn_flags: avoid wrap on precision

Where the precision is specified literally in the format string,
the integer precision value could wrap. Instead, make it croak with

Integer overflow in format string

As in other recent commits, the upper limit is set at 1/4 of STRLEN.

sv.c		diff \| blob \| blame \| history
t/op/sprintf.t		diff \| blob \| blame \| history
t/op/sprintf2.t		diff \| blob \| blame \| history

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