Found by adapting the simple unit tests for libc logging to test
snprintf too. Fix taken from upstream OpenBSD without updating
the rest of stdio.
Change-Id: Ie339a8e9393a36080147aae4d6665118e5d93647
Added va_end() for copied variable arguments lists
in __vfprintf() and __find_arguments().
This is by C standard.
Important for systems which pass arguments in registers.
Change-Id: I7ac42beaa6645bfe856c18132253352dae29ea37
Fix the handle locking in stdio to use flockfile/funlockfile
internally when and where required. Macros in <stdio.h> are updated
to automatically call the underlying functions when the process is
threaded to obtain the necessary locking. A private mutex is added
to protect __sglue, the internal list of FILE handles, and another
to protect the one-time initialization. Some routines in libc that
use getc() change to use getc_unlocked() as they're either protected
by their own lock or aren't thread-safe routines anyway.
Based on OpenBSD change by guenther@openbsd.orghttp://www.mail-archive.com/source-changes@cvs.openbsd.org/msg01015.html
Bug: 3446659
Change-Id: Ie82116e358c541718d6709ec45ca6796be5a007b
