Fix locale for decimal points

resolves #514

src/lib_json/json_reader.cpp

@@ -1619,6 +1619,7 @@ bool OurReader::decodeDouble(Token& token, Value& decoded) {
     Char buffer[bufferSize + 1];
     memcpy(buffer, token.start_, ulength);
     buffer[length] = 0;
+    fixNumericLocaleInput(buffer, buffer + length);
     count = sscanf(buffer, format, &value);
   } else {
     JSONCPP_STRING buffer(token.start_, token.end_);

src/lib_json/json_tool.h

@@ -5,6 +5,7 @@
 
 #ifndef LIB_JSONCPP_JSON_TOOL_H_INCLUDED
 #define LIB_JSONCPP_JSON_TOOL_H_INCLUDED
+#include <clocale>
 
 /* This header provides common string manipulation support, such as UTF-8,
  * portable conversion from/to string...
@@ -82,6 +83,18 @@ static inline void fixNumericLocale(char* begin, char* end) {
   }
 }
 
+static inline void fixNumericLocaleInput(char* begin, char* end) {
+  struct lconv* lc = localeconv();
+  if ((lc != NULL) && (*(lc->decimal_point) != '.')) {
+    while (begin < end) {
+      if (*begin == '.') {
+        *begin = *(lc->decimal_point);
+      }
+      ++begin;
+    }
+  }
+}
+
 } // namespace Json {
 
 #endif // LIB_JSONCPP_JSON_TOOL_H_INCLUDED