Function Dirname

Bcore/src/main/cpp/android-base/file.cpp:319–342

}

std::string Dirname(const std::string& path) {
  // Copy path because dirname may modify the string passed in.
  std::string result(path);

#if !defined(__BIONIC__)
  // Use lock because dirname() may write to a process global and return a
  // pointer to that. Note that this locking strategy only works if all other
  // callers to dirname in the process also grab this same lock, but its
  // better than nothing.  Bionic's dirname returns a thread-local buffer.
  static std::mutex& dirname_lock = *new std::mutex();
  std::lock_guard<std::mutex> lock(dirname_lock);
#endif

  // Note that if std::string uses copy-on-write strings, &str[0] will cause
  // the copy to be made, so there is no chance of us accidentally writing to
  // the storage for 'path'.
  char* parent = dirname(&result[0]);

  // In case dirname returned a pointer to a process global, copy that string
  // before leaving the lock.
  result.assign(parent);

  return result;
}

}  // namespace base
}  // namespace android_lkchan