1 files changed, 104 insertions, 0 deletions
diff --git a/grub-core/commands/cat.c b/grub-core/commands/cat.c
new file mode 100644
index 0000000..9be6cbc
--- /dev/null
+++ b/grub-core/commands/cat.c
@@ -0,0 +1,104 @@
+/* cat.c - command to show the contents of a file  */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2003,2005,2007,2008  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/dl.h>
+#include <grub/file.h>
+#include <grub/disk.h>
+#include <grub/term.h>
+#include <grub/misc.h>
+#include <grub/extcmd.h>
+#include <grub/i18n.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+static const struct grub_arg_option options[] =
+  {
+    {"dos", -1, 0, N_("Accept DOS-style CR/NL line endings."), 0, 0},
+    {0, 0, 0, 0, 0, 0}
+  };
+
+static grub_err_t
+grub_cmd_cat (grub_extcmd_context_t ctxt, int argc, char **args)
+{
+  struct grub_arg_list *state = ctxt->state;
+  int dos = 0;
+  grub_file_t file;
+  char buf[GRUB_DISK_SECTOR_SIZE];
+  grub_ssize_t size;
+  int key = 0;
+
+  if (state[0].set)
+    dos = 1;
+
+  if (argc != 1)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, "file name required");
+
+  file = grub_file_open (args[0]);
+  if (! file)
+    return grub_errno;
+
+  while ((size = grub_file_read (file, buf, sizeof (buf))) > 0
+	 && key != GRUB_TERM_ESC)
+    {
+      int i;
+
+      for (i = 0; i < size; i++)
+	{
+	  unsigned char c = buf[i];
+
+	  if ((grub_isprint (c) || grub_isspace (c)) && c != '\r')
+	    grub_printf ("%c", c);
+	  else if (dos && c == '\r' && i + 1 < size && buf[i + 1] == '\n')
+	    {
+	      grub_printf ("\n");
+	      i++;
+	    }
+	  else
+	    {
+	      grub_setcolorstate (GRUB_TERM_COLOR_HIGHLIGHT);
+	      grub_printf ("<%x>", (int) c);
+	      grub_setcolorstate (GRUB_TERM_COLOR_STANDARD);
+	    }
+	}
+
+      while (grub_checkkey () >= 0 &&
+	     (key = grub_getkey ()) != GRUB_TERM_ESC)
+	;
+    }
+
+  grub_xputs ("\n");
+  grub_refresh ();
+  grub_file_close (file);
+
+  return 0;
+}
+
+static grub_extcmd_t cmd;
+
+GRUB_MOD_INIT(cat)
+{
+  cmd = grub_register_extcmd ("cat", grub_cmd_cat, 0,
+			      N_("FILE"), N_("Show the contents of a file."),
+			      options);
+}
+
+GRUB_MOD_FINI(cat)
+{
+  grub_unregister_extcmd (cmd);
+}