MFC r317888 and two upstream prerequisites:
Pull in r227097 from upstream libc++ trunk (by Marshall Clow):
Fix PR21428. Buffer was one byte too small in octal formatting case. Add test
Pull in r268009 from upstream libc++ trunk (by Eric Fiselier):
Fix PR21428 for long. Buffer was one byte too small in octal formatting case. Rename previously added test
Pull in r302362 from upstream libc++ trunk (by me):
Ensure showbase does not overflow do_put buffers Summary: In https://bugs.freebsd.org/207918, Daniel McRobb describes how using std::showbase with ostreams can cause truncation of unsigned long long when output format is octal. In fact, this can even happen with unsigned int and unsigned long. To ensure this does not happen, add one additional character to the do_put buffers if std::showbase is on. Also add a test case. Reviewers: EricWF, mclow.lists Reviewed By: EricWF Subscribers: cfe-commits, emaste Differential Revision: https://reviews.llvm.org/D32670
PR: 207918