[PATCH] libio: Implement internal function __libc_readline_unlocked

[Florian Weimer]

On 09/01/2017 08:00 PM, Florian Weimer wrote:
> This should use __underflow instead of __uflow, so that the need for the
> special handling for '\n' goes away.

Here is the version based on __underflow.  I changed the way the
__ftello64 and __fseeko64 aliases are handled because the other patch
needs to call __fseko64 from a DSO, so the hidden symbol no longer works.

Thanks,
Florian
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