arch/all-pc/boot/grub2-aros/grub-core/kern/rescue_reader.c

   1 /* rescue_reader.c - rescue mode reader  */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2009,2010  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/reader.h>
  22 #include <grub/parser.h>
  23 #include <grub/misc.h>
  24 #include <grub/term.h>
  25 #include <grub/mm.h>
  26
  27 #define GRUB_RESCUE_BUF_SIZE    256
  28
  29 static char linebuf[GRUB_RESCUE_BUF_SIZE];
  30
  31 /* Prompt to input a command and read the line.  */
  32 static grub_err_t
  33 grub_rescue_read_line (char **line, int cont)
  34 {
  35   int c;
  36   int pos = 0;
  37   char str[4];
  38
  39   grub_printf ((cont) ? "> " : "grub rescue> ");
  40   grub_memset (linebuf, 0, GRUB_RESCUE_BUF_SIZE);
  41
  42   while ((c = grub_getkey ()) != '\n' && c != '\r')
  43     {
  44       if (grub_isprint (c))
  45         {
  46           if (pos < GRUB_RESCUE_BUF_SIZE - 1)
  47             {
  48               str[0] = c;
  49               str[1] = 0;
  50               linebuf[pos++] = c;
  51               grub_xputs (str);
  52             }
  53         }
  54       else if (c == '\b')
  55         {
  56           if (pos > 0)
  57             {
  58               str[0] = c;
  59               str[1] = ' ';
  60               str[2] = c;
  61               str[3] = 0;
  62               linebuf[--pos] = 0;
  63               grub_xputs (str);
  64             }
  65         }
  66       grub_refresh ();
  67     }
  68
  69   grub_xputs ("\n");
  70   grub_refresh ();
  71
  72   *line = grub_strdup (linebuf);
  73
  74   return 0;
  75 }
  76
  77 void __attribute__ ((noreturn))
  78 grub_rescue_run (void)
  79 {
  80   grub_printf ("Entering rescue mode...\n");
  81
  82   while (1)
  83     {
  84       char *line;
  85
  86       /* Print an error, if any.  */
  87       grub_print_error ();
  88       grub_errno = GRUB_ERR_NONE;
  89
  90       grub_rescue_read_line (&line, 0);
  91       if (! line || line[0] == '\0')
  92         continue;
  93
  94       grub_rescue_parse_line (line, grub_rescue_read_line);
  95       grub_free (line);
  96     }
  97 }