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/* rescue_reader.c - rescue mode reader */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2009,2010 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/types.h>
#include <grub/reader.h>
#include <grub/parser.h>
#include <grub/misc.h>
#include <grub/term.h>
#include <grub/mm.h>
#define GRUB_RESCUE_BUF_SIZE 256
static char linebuf[GRUB_RESCUE_BUF_SIZE];
/* Prompt to input a command and read the line. */
static grub_err_t
grub_rescue_read_line (char **line, int cont,
void *data __attribute__ ((unused)))
{
int c;
int pos = 0;
char str[4];
grub_printf ((cont) ? "> " : "grub rescue> ");
grub_memset (linebuf, 0, GRUB_RESCUE_BUF_SIZE);
while ((c = grub_getkey ()) != '\n' && c != '\r')
{
if (grub_isprint (c))
{
if (pos < GRUB_RESCUE_BUF_SIZE - 1)
{
str[0] = c;
str[1] = 0;
linebuf[pos++] = c;
grub_xputs (str);
}
}
else if (c == '\b')
{
if (pos > 0)
{
str[0] = c;
str[1] = ' ';
str[2] = c;
str[3] = 0;
linebuf[--pos] = 0;
grub_xputs (str);
}
}
grub_refresh ();
}
grub_xputs ("\n");
grub_refresh ();
*line = grub_strdup (linebuf);
return 0;
}
void __attribute__ ((noreturn))
grub_rescue_run (void)
{
grub_printf ("Entering rescue mode...\n");
while (1)
{
char *line;
/* Print an error, if any. */
grub_print_error ();
grub_errno = GRUB_ERR_NONE;
grub_rescue_read_line (&line, 0, NULL);
if (! line || line[0] == '\0')
continue;
grub_rescue_parse_line (line, grub_rescue_read_line, NULL);
grub_free (line);
}
}
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