Fix error parsing a numeric constant at the end of file

src/io/json.cpp

@@ -211,32 +211,29 @@ namespace fc
    template<typename T>
    variant number_from_stream( T& in )
    {
-      char buf[30];
+      fc::stringstream ss;
-      memset( buf, 0, sizeof(buf) );
+
-      char* pos = buf;
       bool  dot = false;
       bool  neg = false;
       if( in.peek() == '-')
       {
         neg = true;
-        *pos = in.get();
+        ss.put( in.get() );
-        ++pos;
       }
       bool done = false;
-      while(  !done)
+
+      try
       {
-        char c = in.peek();
+        char c;
+        while((c = in.peek()) && !done)
+        {
+          
           switch( c )
           {
               case '.':
-            {
+                 if (dot) 
-               if( dot ) 
+                    FC_THROW_EXCEPTION(parse_error_exception, "Can't parse a number with two decimal places");
-               {
-                  done = true;
-                  break;
-               }
                  dot = true;
-            }
               case '0':
               case '1':
               case '2':
@@ -247,18 +244,25 @@ namespace fc
               case '7':
               case '8':
               case '9':
-               *pos = c;
+                 ss.put( in.get() );
-               ++pos;
-               in.get();
                  break;
               default:
                 done = true;
                 break;
           }
         }
-      if( dot ) return to_double(buf);
+      }
-      if( neg ) return to_int64(buf);
+      catch (fc::eof_exception&)
-      return to_uint64(buf);
+      {
+      }
+      fc::string str = ss.str();
+      if (str == "-." || str == ".") // check the obviously wrong things we could have encountered
+        FC_THROW_EXCEPTION(parse_error_exception, "Can't parse token \"${token}\" as a JSON numeric constant", ("token", str));
+      if( dot )
+        return to_double(str);
+      if( neg ) 
+        return to_int64(str);
+      return to_uint64(str);
    }
    template<typename T>
    variant token_from_stream( T& in )
@@ -269,7 +273,7 @@ namespace fc
       try
       {
         char c;
-        while( (c = in.peek())  && !parsed_unexpected_character)
+        while((c = in.peek()) && !parsed_unexpected_character)
         {
            switch( c )
            {