Function CamelCaseToUnderscoreCase

library/cpp/yt/string/string.cpp:44–57

}

void CamelCaseToUnderscoreCase(TStringBuilderBase* builder, TStringBuf str)
{
    bool first = true;
    for (char c : str) {
        if (std::isupper(c) && std::isalpha(c)) {
            if (!first) {
                builder->AppendChar('_');
            }
            c = std::tolower(c);
        }
        builder->AppendChar(c);
        first = false;
    }
}

TString CamelCaseToUnderscoreCase(TStringBuf str)
{