Add setlocale() calls around use of libarchive APIs (#14934, #15377)

The libarchive APIs use nl_langinfo(CODESET) for iconv so they need the
locale to be set for LC_CTYPE.  However, the rest of CMake does not
define any behavior for non-ASCII character classification/conversion so
we do not want to setlocale() globally.  Add a RAII class to save, set,
and restore the locale around calls to libarchive APIs.

Inspired-by: Clinton Stimpson <clinton@elemtech.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/Source/cmLocale.h b/Source/cmLocale.h
new file mode 100644
index 0000000000..727f0f5d40
--- /dev/null
+++ b/Source/cmLocale.h
@@ -0,0 +1,31 @@
+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2015 Kitware, Inc., Insight Software Consortium
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#ifndef cmLocale_h
+#define cmLocale_h
+
+#include <locale.h>
+
+class cmLocaleRAII
+{
+  const char* OldLocale;
+public:
+  cmLocaleRAII(): OldLocale(setlocale(LC_CTYPE, 0))
+    {
+    setlocale(LC_CTYPE, "");
+    }
+  ~cmLocaleRAII()
+    {
+    setlocale(LC_CTYPE, this->OldLocale);
+    }
+};
+
+#endif