1 files changed, 98 insertions, 0 deletions
diff --git a/grub-core/kern/rescue_reader.c b/grub-core/kern/rescue_reader.c
new file mode 100644
index 0000000..dcd7d44
--- /dev/null
+++ b/grub-core/kern/rescue_reader.c
@@ -0,0 +1,98 @@
+/* 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);
+    }
+}