Merge pull request #519 from open-source-parsers/fix-517

Avoid null for stringValue

src/lib_json/json_value.cpp

@@ -343,6 +343,7 @@ bool Value::CZString::isStaticString() const { return storage_.policy_ == noDupl
  * This optimization is used in ValueInternalMap fast allocator.
  */
 Value::Value(ValueType vtype) {
+  static char const empty[] = "";
   initBasic(vtype);
   switch (vtype) {
   case nullValue:
@@ -355,7 +356,8 @@ Value::Value(ValueType vtype) {
     value_.real_ = 0.0;
     break;
   case stringValue:
-    value_.string_ = 0;
+    // allocated_ == false, so this is safe.
+    value_.string_ = const_cast<char*>(static_cast<char const*>(empty));
     break;
   case arrayValue:
   case objectValue:

src/lib_json/json_writer.cpp

@@ -353,7 +353,7 @@ void FastWriter::writeValue(const Value& value) {
     break;
   case stringValue:
   {
-    // Is NULL possible for value.string_?
+    // Is NULL possible for value.string_? No.
     char const* str;
     char const* end;
     bool ok = value.getString(&str, &end);
@@ -423,7 +423,7 @@ void StyledWriter::writeValue(const Value& value) {
     break;
   case stringValue:
   {
-    // Is NULL possible for value.string_?
+    // Is NULL possible for value.string_? No.
     char const* str;
     char const* end;
     bool ok = value.getString(&str, &end);
@@ -640,7 +640,7 @@ void StyledStreamWriter::writeValue(const Value& value) {
     break;
   case stringValue:
   {
-    // Is NULL possible for value.string_?
+    // Is NULL possible for value.string_? No.
     char const* str;
     char const* end;
     bool ok = value.getString(&str, &end);
@@ -921,7 +921,7 @@ void BuiltStyledStreamWriter::writeValue(Value const& value) {
     break;
   case stringValue:
   {
-    // Is NULL is possible for value.string_?
+    // Is NULL is possible for value.string_? No.
     char const* str;
     char const* end;
     bool ok = value.getString(&str, &end);