Dimitry Andric 2f214595bc 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

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@302362 91177308-0d34-0410-b5e6-96231b3b80d8

2017-05-06 20:58:50 +00:00

..

ext.manip

[libcxx] [test] Fix MSVC warning C4244 "conversion from 'X' to 'Y', possible loss of data", part 1/7.

2016-12-08 21:37:47 +00:00

input.streams

Add markup for libc++ dylib availability

2017-05-04 17:08:54 +00:00

output.streams

Ensure showbase does not overflow do_put buffers

2017-05-06 20:58:50 +00:00

quoted.manip

[libcxx] [test] Fix comment typos, strip trailing whitespace.

2017-01-18 20:10:25 +00:00

std.manip

Move remaining _LIBCPP_VERSION tests into test/libcxx

2016-06-22 02:23:22 +00:00

nothing_to_do.pass.cpp

Move test into test/std subdirectory.

2014-12-20 01:40:03 +00:00