[4.8] Handle NULL return value of setlocale() in libstdc++

Bionic setlocale() always returns NULL.  $NDK/tests/device/test-gnustl-2
(as well as others using iostream, etc) segfault w/o this change

See d3029b5a1a770d75806370618f7311a991107119,
20ffc596a2771a96ac9b4a4838edc7779a48f0af and
https://code.google.com/p/android/issues/detail?id=46718

Change-Id: I4808ebaedc5495cbc074999b22e3ffea5ba2947c

3 files changed, 41 insertions, 21 deletions

diff --git a/gcc-4.8/libstdc++-v3/config/locale/generic/c_locale.cc b/gcc-4.8/libstdc++-v3/config/locale/generic/c_locale.cc
index 0d309a576..b4dcea9d1 100644
--- a/gcc-4.8/libstdc++-v3/config/locale/generic/c_locale.cc
+++ b/gcc-4.8/libstdc++-v3/config/locale/generic/c_locale.cc
@@ -51,10 +51,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     {
       // Assumes __s formatted for "C" locale.
       char* __old = setlocale(LC_ALL, 0);
-      const size_t __len = strlen(__old) + 1;
-      char* __sav = new char[__len];
-      memcpy(__sav, __old, __len);
-      setlocale(LC_ALL, "C");
+      char* __sav = 0;
+      if (__old)
+        {
+          const size_t __len = strlen(__old) + 1;
+          __sav = new char[__len];
+          memcpy(__sav, __old, __len);
+          setlocale(LC_ALL, "C");
+        }
       char* __sanity;
       bool __overflow = false;
 
@@ -116,10 +120,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     {
       // Assumes __s formatted for "C" locale.
       char* __old = setlocale(LC_ALL, 0);
-      const size_t __len = strlen(__old) + 1;
-      char* __sav = new char[__len];
-      memcpy(__sav, __old, __len);
-      setlocale(LC_ALL, "C");
+      char* __sav = 0;
+      if (__old)
+        {
+          const size_t __len = strlen(__old) + 1;
+          __sav = new char[__len];
+          memcpy(__sav, __old, __len);
+          setlocale(LC_ALL, "C");
+        }
       char* __sanity;
 
 #if !__DBL_HAS_INFINITY__
@@ -161,10 +169,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     {
       // Assumes __s formatted for "C" locale.
       char* __old = setlocale(LC_ALL, 0);
-      const size_t __len = strlen(__old) + 1;
-      char* __sav = new char[__len];
-      memcpy(__sav, __old, __len);
-      setlocale(LC_ALL, "C");
+      char* __sav = 0;
+      if (__old)
+        {
+          const size_t __len = strlen(__old) + 1;
+          __sav = new char[__len];
+          memcpy(__sav, __old, __len);
+          setlocale(LC_ALL, "C");
+        }
 
 #if !__LDBL_HAS_INFINITY__
       errno = 0;
diff --git a/gcc-4.8/libstdc++-v3/config/locale/generic/c_locale.h b/gcc-4.8/libstdc++-v3/config/locale/generic/c_locale.h
index b5fd989a6..08f59e405 100644
--- a/gcc-4.8/libstdc++-v3/config/locale/generic/c_locale.h
+++ b/gcc-4.8/libstdc++-v3/config/locale/generic/c_locale.h
@@ -59,7 +59,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   {
     char* __old = std::setlocale(LC_NUMERIC, 0);
     char* __sav = 0;
-    if (__builtin_strcmp(__old, "C"))
+    if (__old && __builtin_strcmp(__old, "C"))
       {
 	const size_t __len = __builtin_strlen(__old) + 1;
 	__sav = new char[__len];
diff --git a/gcc-4.8/libstdc++-v3/config/locale/generic/time_members.cc b/gcc-4.8/libstdc++-v3/config/locale/generic/time_members.cc
index 056e4fd1a..4e32caba7 100644
--- a/gcc-4.8/libstdc++-v3/config/locale/generic/time_members.cc
+++ b/gcc-4.8/libstdc++-v3/config/locale/generic/time_members.cc
@@ -44,10 +44,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	   const tm* __tm) const throw()
     {
       char* __old = setlocale(LC_ALL, 0);
-      const size_t __llen = strlen(__old) + 1;
-      char* __sav = new char[__llen];
-      memcpy(__sav, __old, __llen);
-      setlocale(LC_ALL, _M_name_timepunct);
+      char* __sav = 0;
+      if (__old)
+        {
+          const size_t __llen = strlen(__old) + 1;
+          __sav = new char[__llen];
+          memcpy(__sav, __old, __llen);
+          setlocale(LC_ALL, _M_name_timepunct);
+        }
       const size_t __len = strftime(__s, __maxlen, __format, __tm);
       setlocale(LC_ALL, __sav);
       delete [] __sav;
@@ -129,10 +133,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	   const tm* __tm) const throw()
     {
       char* __old = setlocale(LC_ALL, 0);
-      const size_t __llen = strlen(__old) + 1;
-      char* __sav = new char[__llen];
-      memcpy(__sav, __old, __llen);
-      setlocale(LC_ALL, _M_name_timepunct);
+      char* __sav = 0;
+      if (__old)
+        {
+          const size_t __llen = strlen(__old) + 1;
+          __sav = new char[__llen];
+          memcpy(__sav, __old, __llen);
+          setlocale(LC_ALL, _M_name_timepunct);
+        }
       const size_t __len = wcsftime(__s, __maxlen, __format, __tm);
       setlocale(LC_ALL, __sav);
       delete [] __sav;