Function join_lines

src/runner/cli_wide_posix.cpp:34–43

namespace {
std::string join_lines(const std::vector<std::string>& lines) {
    std::string merged;
    for (size_t i = 0; i < lines.size(); ++i) {
        if (i > 0) {
            merged += "\n";
        }
        merged += lines[i];
    }
    return merged;
}

bool stdin_has_pending_input(int wait_ms) {
    pollfd pfd{};