| file_check_directory | drupal/includes/file.inc | Check that the directory exists and is writable. |
| file_create_path | drupal/includes/file.inc | Make sure the destination is a complete path and resides in the file system
directory, if it is not prepend the file system directory. |
| file_save_data | drupal/includes/file.inc | Save a string to the specified destination and create a database file entry. |
| file_save_upload | drupal/includes/file.inc | Saves a file upload to a new location. |
| file_unmanaged_save_data | drupal/includes/file.inc | Save a string to the specified destination without calling any hooks or
making any changes to the database. |
| system_file_system_settings | drupal/modules/system/system.admin.inc | Form builder; Configure the site file handling. |
