kern/reader.c

   1 /* reader.c - reader support */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2009  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/types.h>
  21 #include <grub/mm.h>
  22 #include <grub/reader.h>
  23 #include <grub/parser.h>
  24
  25 struct grub_handler_class grub_reader_class =
  26   {
  27     .name = "reader"
  28   };
  29
  30 grub_err_t
  31 grub_reader_loop (grub_reader_getline_t getline)
  32 {
  33   while (1)
  34     {
  35       char *line;
  36       grub_reader_getline_t func;
  37
  38       /* Print an error, if any.  */
  39       grub_print_error ();
  40       grub_errno = GRUB_ERR_NONE;
  41
  42       func = (getline) ? : grub_reader_get_current ()->read_line;
  43       if ((func (&line, 0)) || (! line))
  44         return grub_errno;
  45
  46       grub_parser_get_current ()->parse_line (line, func);
  47       grub_free (line);
  48     }
  49 }