Function to_underscored_name

src/bvar/variable.cpp:942–961

    &FLAGS_mbvar_dump_format, validate_mbvar_dump_format);

void to_underscored_name(std::string* name, const butil::StringPiece& src) {
    name->reserve(name->size() + src.size() + 8/*just guess*/);
    for (const char* p = src.data(); p != src.data() + src.size(); ++p) {
        if (isalpha(*p)) {
            if (*p < 'a') { // upper cases
                if (p != src.data() && !isupper(p[-1]) &&
                    butil::back_char(*name) != '_') {
                    name->push_back('_');
                }
                name->push_back(*p - 'A' + 'a');
            } else {
                name->push_back(*p);
            }
        } else if (isdigit(*p)) {
            name->push_back(*p);
        } else if (name->empty() || butil::back_char(*name) != '_') {
            name->push_back('_');
        }
    }
}

// UT don't need default variables.
#if !defined(BVAR_NOT_LINK_DEFAULT_VARIABLES)