Import libc++ trunk r165949. Among other improvements and bug fixes,

this has many visibility problems fixed, which should help with
compiling certain ports that exercise C++11 mode (i.e. Firefox).

Also, belatedly add the LICENSE.TXT and accompanying CREDITS.TXT files,
which are referred to in all the source files.

MFC after:	1 month

1 files changed, 50 insertions, 2 deletions

diff --git a/contrib/libc++/include/locale b/contrib/libc++/include/locale
index bec27f6..0d77a4a 100644
--- a/contrib/libc++/include/locale
+++ b/contrib/libc++/include/locale
@@ -1587,6 +1587,52 @@ __pad_and_output(_OutputIterator __s,
     return __s;
 }
 
+template <class _CharT, class _Traits>
+_LIBCPP_HIDDEN
+ostreambuf_iterator<_CharT, _Traits>
+__pad_and_output(ostreambuf_iterator<_CharT, _Traits> __s,
+                 const _CharT* __ob, const _CharT* __op, const _CharT* __oe,
+                 ios_base& __iob, _CharT __fl)
+{
+    if (__s.__sbuf_ == nullptr)
+        return __s;
+    streamsize __sz = __oe - __ob;
+    streamsize __ns = __iob.width();
+    if (__ns > __sz)
+        __ns -= __sz;
+    else
+        __ns = 0;
+    streamsize __np = __op - __ob;
+    if (__np > 0)
+    {
+        if (__s.__sbuf_->sputn(__ob, __np) != __np)
+        {
+            __s.__sbuf_ = nullptr;
+            return __s;
+        }
+    }
+    if (__ns > 0)
+    {
+        basic_string<_CharT, _Traits> __sp(__ns, __fl);
+        if (__s.__sbuf_->sputn(__sp.data(), __ns) != __ns)
+        {
+            __s.__sbuf_ = nullptr;
+            return __s;
+        }
+    }
+    __np = __oe - __op;
+    if (__np > 0)
+    {
+        if (__s.__sbuf_->sputn(__op, __np) != __np)
+        {
+            __s.__sbuf_ = nullptr;
+            return __s;
+        }
+    }
+    __iob.width(0);
+    return __s;
+}
+
 template <class _CharT, class _OutputIterator>
 _OutputIterator
 num_put<_CharT, _OutputIterator>::do_put(iter_type __s, ios_base& __iob,
@@ -3920,7 +3966,8 @@ wstring_convert<_Codecvt, _Elem, _Wide_alloc, _Byte_alloc>::
     if (__cvtptr_ != nullptr)
     {
         wide_string __ws(2*(__frm_end - __frm), _Elem());
-        __ws.resize(__ws.capacity());
+        if (__frm != __frm_end)
+            __ws.resize(__ws.capacity());
         codecvt_base::result __r = codecvt_base::ok;
         state_type __st = __cvtstate_;
         if (__frm != __frm_end)
@@ -3980,7 +4027,8 @@ wstring_convert<_Codecvt, _Elem, _Wide_alloc, _Byte_alloc>::
     if (__cvtptr_ != nullptr)
     {
         byte_string __bs(2*(__frm_end - __frm), char());
-        __bs.resize(__bs.capacity());
+        if (__frm != __frm_end)
+            __bs.resize(__bs.capacity());
         codecvt_base::result __r = codecvt_base::ok;
         state_type __st = __cvtstate_;
         if (__frm != __frm_end)