Integrated the not yet accepted boost::nowide library, thanks @alexrj.

xs/src/boost/nowide/args.hpp

@@ -0,0 +1,167 @@
+//
+//  Copyright (c) 2012 Artyom Beilis (Tonkikh)
+//
+//  Distributed under the Boost Software License, Version 1.0. (See
+//  accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+#ifndef BOOST_NOWIDE_ARGS_HPP_INCLUDED
+#define BOOST_NOWIDE_ARGS_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#include <boost/nowide/stackstring.hpp>
+#include <vector>
+#ifdef BOOST_WINDOWS
+#include <boost/nowide/windows.hpp>
+#endif
+
+namespace boost {
+namespace nowide {
+    #if !defined(BOOST_WINDOWS) && !defined(BOOST_NOWIDE_DOXYGEN)
+    class args {
+    public:
+        args(int &,char **&) {}
+        args(int &,char **&,char **&){}
+        ~args() {}
+    };
+
+    #else
+
+    ///
+    /// \brief args is a class that fixes standard main() function arguments and changes them to UTF-8 under 
+    /// Microsoft Windows.
+    ///
+    /// The class uses \c GetCommandLineW(), \c CommandLineToArgvW() and \c GetEnvironmentStringsW()
+    /// in order to obtain the information. It does not relates to actual values of argc,argv and env
+    /// under Windows.
+    ///
+    /// It restores the original values in its destructor
+    ///
+    /// \note the class owns the memory of the newly allocated strings
+    ///
+    class args {
+    public:
+        
+        ///
+        /// Fix command line agruments 
+        ///
+        args(int &argc,char **&argv) :
+            old_argc_(argc),
+            old_argv_(argv),
+            old_env_(0),
+            old_argc_ptr_(&argc),
+            old_argv_ptr_(&argv),
+            old_env_ptr_(0)
+        {
+            fix_args(argc,argv);
+        }
+        ///
+        /// Fix command line agruments and environment
+        ///
+        args(int &argc,char **&argv,char **&en) :
+            old_argc_(argc),
+            old_argv_(argv),
+            old_env_(en),
+            old_argc_ptr_(&argc),
+            old_argv_ptr_(&argv),
+            old_env_ptr_(&en)
+        {
+            fix_args(argc,argv);
+            fix_env(en);
+        }
+        ///
+        /// Restore original argc,argv,env values, if changed
+        ///
+        ~args()
+        {
+            if(old_argc_ptr_)
+                *old_argc_ptr_ = old_argc_;
+            if(old_argv_ptr_)
+                *old_argv_ptr_ = old_argv_;
+            if(old_env_ptr_) 
+                *old_env_ptr_ = old_env_;
+        }
+    private:    
+        void fix_args(int &argc,char **&argv)
+        {
+                int wargc;
+                wchar_t **wargv = CommandLineToArgvW(GetCommandLineW(),&wargc);
+            if(!wargv) {
+                argc = 0;
+                static char *dummy = 0;
+                argv = &dummy;
+                return;
+            }
+            try{ 
+                args_.resize(wargc+1,0);
+                arg_values_.resize(wargc);
+                for(int i=0;i<wargc;i++) {
+                    if(!arg_values_[i].convert(wargv[i])) {
+                        wargc = i;
+                        break;
+                    }
+                    args_[i] = arg_values_[i].c_str();
+                }
+                argc = wargc;
+                argv = &args_[0];
+            }
+            catch(...) {
+                LocalFree(wargv);
+                throw;
+            }
+            LocalFree(wargv);
+        }
+        void fix_env(char **&en)
+        {
+            static char *dummy = 0;
+            en = &dummy;
+            wchar_t *wstrings = GetEnvironmentStringsW();
+            if(!wstrings)
+                return;
+            try {
+                wchar_t *wstrings_end = 0;
+                int count = 0;
+                for(wstrings_end = wstrings;*wstrings_end;wstrings_end+=wcslen(wstrings_end)+1)
+                        count++;
+                if(env_.convert(wstrings,wstrings_end)) {
+                    envp_.resize(count+1,0);
+                    char *p=env_.c_str();
+                    int pos = 0;
+                    for(int i=0;i<count;i++) {
+                        if(*p!='=')
+                            envp_[pos++] = p;
+                        p+=strlen(p)+1;
+                    }
+                    en = &envp_[0];
+                }
+            }
+            catch(...) {
+                FreeEnvironmentStringsW(wstrings);
+                throw;
+            }
+            FreeEnvironmentStringsW(wstrings);
+
+        }
+
+        std::vector<char *> args_;
+        std::vector<short_stackstring> arg_values_;
+        stackstring env_;
+        std::vector<char *> envp_;
+
+        int old_argc_;
+        char **old_argv_;
+        char **old_env_;
+
+        int  *old_argc_ptr_;
+        char ***old_argv_ptr_;
+        char ***old_env_ptr_;
+    };
+
+    #endif
+
+} // nowide
+} // namespace boost
+#endif
+
+///
+// vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4