[Bug stdio/30441] snprintf truncates output on extremely large buffer sizes

["gabravier at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30441

--- Comment #1 from Gabriel Ravier <gabravier at gmail dot com> ---
PS: The bug appears to be caused by the fact that glibc internally tries to
compute a pointer to the end of the provided buffer, which results in a pretty
much guaranteed overflow given the provided value. This in turn ends up making
a later if statement of: `if (buf->base.write_ptr < buf->base.write_end)` fail,
where that if statement seems to have been meant to check for the case where
less characters than the buffer can contain have been written (which is the
case here, but the if statement thinks this is not the case because of the
pointer arithmetic overflow).

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