Merge pull request #4390

a0613532 secure_pwd_reader: Add proper Unicode handling [Ryo contribution] (fireice-uk)
579383c2 simplewallet: Add Unicode input_line [Ryo backport] (fireice-uk)

src/common/password.cpp

@@ -56,8 +56,6 @@ namespace
 
   bool read_from_tty(epee::wipeable_string& pass, bool hide_input)
   {
-    static constexpr const char BACKSPACE = 8;
-
     HANDLE h_cin = ::GetStdHandle(STD_INPUT_HANDLE);
 
     DWORD mode_old;
@@ -67,32 +65,46 @@ namespace
 
     bool r = true;
     pass.reserve(tools::password_container::max_password_size);
+    std::vector<int> chlen;
+    chlen.reserve(tools::password_container::max_password_size);
     while (pass.size() < tools::password_container::max_password_size)
     {
       DWORD read;
-      char ch;
+      wchar_t ucs2_ch;
-      r = (TRUE == ::ReadConsoleA(h_cin, &ch, 1, &read, NULL));
+      r = (TRUE == ::ReadConsoleW(h_cin, &ucs2_ch, 1, &read, NULL));
       r &= (1 == read);
+
       if (!r)
       {
         break;
       }
-      else if (ch == '\n' || ch == '\r')
+      else if (ucs2_ch == L'\n' || ucs2_ch == L'\r')
       {
         std::cout << std::endl;
         break;
       }
-      else if (ch == BACKSPACE)
+      else if (ucs2_ch == L'\b')
       {
         if (!pass.empty())
         {
-          pass.pop_back();
+          int len = chlen.back();
+          chlen.pop_back();
+          while(len-- > 0) 
+            pass.pop_back();
         }
+        continue;
       }
-      else
+      
-      {
+      char utf8_ch[8] = {0};
-        pass.push_back(ch);
+      int len;
-      }
+      if((len = WideCharToMultiByte(CP_UTF8, 0, &ucs2_ch, 1, utf8_ch, sizeof(utf8_ch), NULL, NULL)) <= 0)
+        break;
+
+      if(pass.size() + len >= tools::password_container::max_password_size)
+        break;
+
+      chlen.push_back(len);
+      pass += utf8_ch;
     }
 
     ::SetConsoleMode(h_cin, mode_old);

src/common/util.cpp

@@ -939,4 +939,32 @@ std::string get_nix_version_display_string()
     }
     return newval;
   }
+  
+#ifdef _WIN32
+  std::string input_line_win()
+  {
+    HANDLE hConIn = CreateFileW(L"CONIN$", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, nullptr, OPEN_EXISTING, 0, nullptr);
+    DWORD oldMode;
+
+    FlushConsoleInputBuffer(hConIn);
+    GetConsoleMode(hConIn, &oldMode);
+    SetConsoleMode(hConIn, ENABLE_LINE_INPUT | ENABLE_ECHO_INPUT | ENABLE_PROCESSED_INPUT);
+
+    wchar_t buffer[1024];
+    DWORD read;
+
+    ReadConsoleW(hConIn, buffer, sizeof(buffer)/sizeof(wchar_t)-1, &read, nullptr);
+    buffer[read] = 0;
+
+    SetConsoleMode(hConIn, oldMode);
+    CloseHandle(hConIn);
+  
+    int size_needed = WideCharToMultiByte(CP_UTF8, 0, buffer, -1, NULL, 0, NULL, NULL);
+    std::string buf(size_needed, '\0');
+    WideCharToMultiByte(CP_UTF8, 0, buffer, -1, &buf[0], size_needed, NULL, NULL);
+    buf.pop_back(); //size_needed includes null that we needed to have space for
+    return buf;
+  }
+#endif
+
 }

src/common/util.h

@@ -235,4 +235,7 @@ namespace tools
   boost::optional<std::pair<uint32_t, uint32_t>> parse_subaddress_lookahead(const std::string& str);
 
   std::string glob_to_regex(const std::string &val);
+#ifdef _WIN32
+  std::string input_line_win();
+#endif
 }

src/simplewallet/simplewallet.cpp

@@ -137,47 +137,6 @@ namespace
 
   const command_line::arg_descriptor< std::vector<std::string> > arg_command = {"command", ""};
 
-#ifdef WIN32
-  // Translate from CP850 to UTF-8;
-  // std::getline for a Windows console returns a string in CP437 or CP850; as simplewallet,
-  // like all of Monero, is assumed to work internally with UTF-8 throughout, even on Windows
-  // (although only implemented partially), a translation to UTF-8 is needed for input.
-  //
-  // Note that if a program is started inside the MSYS2 shell somebody already translates
-  // console input to UTF-8, but it's not clear how one could detect that in order to avoid
-  // double-translation; this code here thus breaks UTF-8 input within a MSYS2 shell,
-  // unfortunately.
-  //
-  // Note also that input for passwords is NOT translated, to remain compatible with any
-  // passwords containing special characters that predate this switch to UTF-8 support.
-  template<typename T>
-  static T cp850_to_utf8(const T &cp850_str)
-  {
-    boost::locale::generator gen;
-    gen.locale_cache_enabled(true);
-    std::locale loc = gen("en_US.CP850");
-    const boost::locale::conv::method_type how = boost::locale::conv::default_method;
-    T result;
-    const char *begin = cp850_str.data();
-    const char *end = begin + cp850_str.size();
-    result.reserve(end-begin);
-    typedef std::back_insert_iterator<T> inserter_type;
-    inserter_type inserter(result);
-    boost::locale::utf::code_point c;
-    while(begin!=end) {
-        c=boost::locale::utf::utf_traits<char>::template decode<char const *>(begin,end);
-        if(c==boost::locale::utf::illegal || c==boost::locale::utf::incomplete) {
-            if(how==boost::locale::conv::stop)
-                throw boost::locale::conv::conversion_error();
-        }
-        else {
-            boost::locale::utf::utf_traits<char>::template encode<inserter_type>(c,inserter);
-        }
-    }
-    return result;
-  }
-#endif
-
   std::string input_line(const std::string& prompt)
   {
 #ifdef HAVE_READLINE
@@ -186,9 +145,10 @@ namespace
     std::cout << prompt;
 
     std::string buf;
+#ifdef _WIN32
+    buf = tools::input_line_win();
+#else
     std::getline(std::cin, buf);
-#ifdef WIN32
-    buf = cp850_to_utf8(buf);
 #endif
 
     return epee::string_tools::trim(buf);
@@ -208,10 +168,6 @@ namespace
 
     epee::wipeable_string buf = pwd_container->password();
 
-#ifdef WIN32
-    buf = cp850_to_utf8(buf);
-#endif
-
     buf.trim();
     return buf;
   }