arch/common/boot/grub2/commands/cat.c

   1 /* cat.c - command to show the contents of a file  */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2003,2005,2007,2008  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/normal.h>
  21 #include <grub/dl.h>
  22 #include <grub/arg.h>
  23 #include <grub/file.h>
  24 #include <grub/disk.h>
  25 #include <grub/term.h>
  26 #include <grub/misc.h>
  27 #include <grub/gzio.h>
  28
  29 static grub_err_t
  30 grub_cmd_cat (struct grub_arg_list *state __attribute__ ((unused)),
  31               int argc, char **args)
  32
  33 {
  34   grub_file_t file;
  35   char buf[GRUB_DISK_SECTOR_SIZE];
  36   grub_ssize_t size;
  37   int key = 0;
  38
  39   if (argc != 1)
  40     return grub_error (GRUB_ERR_BAD_ARGUMENT, "file name required");
  41
  42   file = grub_gzfile_open (args[0], 1);
  43   if (! file)
  44     return 0;
  45
  46   while ((size = grub_file_read (file, buf, sizeof (buf))) > 0
  47          && key != GRUB_TERM_ESC)
  48     {
  49       int i;
  50
  51       for (i = 0; i < size; i++)
  52         {
  53           unsigned char c = buf[i];
  54
  55           if ((grub_isprint (c) || grub_isspace (c)) && c != '\r')
  56             grub_putchar (c);
  57           else
  58             {
  59               grub_setcolorstate (GRUB_TERM_COLOR_HIGHLIGHT);
  60               grub_printf ("<%x>", (int) c);
  61               grub_setcolorstate (GRUB_TERM_COLOR_STANDARD);
  62             }
  63         }
  64
  65       while (grub_checkkey () >= 0 &&
  66              (key = GRUB_TERM_ASCII_CHAR (grub_getkey ())) != GRUB_TERM_ESC)
  67         ;
  68     }
  69
  70   grub_putchar ('\n');
  71   grub_refresh ();
  72   grub_file_close (file);
  73
  74   return 0;
  75 }
  76
  77 \f
  78 GRUB_MOD_INIT(cat)
  79 {
  80   (void) mod;                   /* To stop warning. */
  81   grub_register_command ("cat", grub_cmd_cat, GRUB_COMMAND_FLAG_BOTH,
  82                          "cat FILE", "Show the contents of a file.", 0);
  83 }
  84
  85 GRUB_MOD_FINI(cat)
  86 {
  87   grub_unregister_command ("cat");
  88 }