Function tmpfs_create_file

fs/tmpfs/fs_tmpfs.c:597–708

 ****************************************************************************/

static int tmpfs_create_file(FAR struct tmpfs_s *fs,
                             FAR const char *relpath,
                             FAR struct tmpfs_file_s **tfo)
{
  FAR struct tmpfs_directory_s *parent;
  FAR struct tmpfs_file_s *newtfo;
  FAR const char *name;
  int ret;

  /* Separate the path into the file name and the path to the parent
   * directory.
   */

  name = strrchr(relpath, '/');
  if (name == NULL)
    {
      /* No subdirectories... use the root directory */

      name   = relpath;
      parent = (FAR struct tmpfs_directory_s *)fs->tfs_root.tde_object;

      /* Lock the root directory to emulate the behavior of
       * tmpfs_find_directory()
       */

      ret = tmpfs_lock_directory(parent);
      if (ret < 0)
        {
          return ret;
        }

      parent->tdo_refs++;
    }
  else if (name[1] != '\0')
    {
      /* Locate the parent directory that should contain this name.
       * On success, tmpfs_find_directory() will lock the parent
       * directory and increment the reference count.
       */

      ret = tmpfs_find_directory(fs, relpath, name - relpath, &parent, NULL);
      if (ret < 0)
        {
          return ret;
        }

      /* Skip the '/' path separator */

      name++;
    }
  else
    {
      return -EISDIR;
    }

  /* Verify that no object of this name already exists in the directory */

  ret = tmpfs_find_dirent(parent, name, strlen(name));