Added thirdparty: boost library

thirdparty/include/boost/nowide/cstdlib.hpp

@@ -0,0 +1,66 @@
+//
+// Copyright (c) 2012 Artyom Beilis (Tonkikh)
+//
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#ifndef BOOST_NOWIDE_CSTDLIB_HPP_INCLUDED
+#define BOOST_NOWIDE_CSTDLIB_HPP_INCLUDED
+
+#include <boost/nowide/config.hpp>
+#if !defined(BOOST_WINDOWS)
+#include <cstdlib>
+#endif
+
+namespace boost {
+namespace nowide {
+#if !defined(BOOST_WINDOWS) && !defined(BOOST_NOWIDE_DOXYGEN)
+    using std::getenv;
+    using std::system;
+#else
+    ///
+    /// \brief UTF-8 aware getenv. Returns 0 if the variable is not set.
+    ///
+    /// This function is not thread safe or reenterable as defined by the standard library
+    ///
+    BOOST_NOWIDE_DECL char* getenv(const char* key);
+
+    ///
+    /// Same as std::system but cmd is UTF-8.
+    ///
+    BOOST_NOWIDE_DECL int system(const char* cmd);
+
+#endif
+    ///
+    /// \brief Set environment variable \a key to \a value
+    ///
+    /// if overwrite is not 0, that the old value is always overwritten, otherwise,
+    /// if the variable exists it remains unchanged
+    ///
+    /// \a key and \a value are UTF-8 on Windows
+    /// \return zero on success, else nonzero
+    ///
+    BOOST_NOWIDE_DECL int setenv(const char* key, const char* value, int overwrite);
+
+    ///
+    /// \brief Remove environment variable \a key
+    ///
+    /// \a key is UTF-8 on Windows
+    /// \return zero on success, else nonzero
+    ///
+    BOOST_NOWIDE_DECL int unsetenv(const char* key);
+
+    ///
+    /// \brief Adds or changes an environment variable, \a string must be in format KEY=VALUE
+    ///
+    /// \a string MAY become part of the environment, hence changes to the value MAY change
+    /// the environment. For portability it is hence recommended NOT to change it.
+    /// \a string is UTF-8 on Windows
+    /// \return zero on success, else nonzero
+    ///
+    BOOST_NOWIDE_DECL int putenv(char* string);
+
+} // namespace nowide
+} // namespace boost
+
+#endif