szaszm commented on a change in pull request #1028:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1028#discussion_r596871602
##########
File path: extensions/script/lua/LuaBaseStream.cpp
##########
@@ -52,16 +52,11 @@ std::string LuaBaseStream::read(size_t len) {
// 0 <= n < s.size()."
//
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3337.pdf
- auto read = stream_->read(reinterpret_cast<uint8_t *>(&buffer[0]),
static_cast<int>(len));
- if (read < 0) {
- return nullptr;
- }
-
- if (gsl::narrow<size_t>(read) != len) {
- buffer.resize(gsl::narrow<size_t>(read));
+ const auto read = stream_->read(reinterpret_cast<uint8_t *>(&buffer[0]),
len);
+ if (!io::isError(read) && read != len) {
+ buffer.resize(read);
}
-
- return buffer;
+ return io::isError(read) ? std::string{} : buffer;
Review comment:
My understanding is that in case of an error the old version returned
`nullptr` as `std::string`, invoking the `std::string::string(const char*)`
constructor which led to undefined behavior. I thought replacing this with a
defined empty string would be better, but I might be missing something.
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