grub-core/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/dl.h>
  21 #include <grub/file.h>
  22 #include <grub/disk.h>
  23 #include <grub/term.h>
  24 #include <grub/misc.h>
  25 #include <grub/extcmd.h>
  26 #include <grub/i18n.h>
  27
  28 GRUB_MOD_LICENSE ("GPLv3+");
  29
  30 static const struct grub_arg_option options[] =
  31   {
  32     {"dos", -1, 0, N_("Accept DOS-style CR/NL line endings."), 0, 0},
  33     {0, 0, 0, 0, 0, 0}
  34   };
  35
  36 static grub_err_t
  37 grub_cmd_cat (grub_extcmd_context_t ctxt, int argc, char **args)
  38 {
  39   struct grub_arg_list *state = ctxt->state;
  40   int dos = 0;
  41   grub_file_t file;
  42   char buf[GRUB_DISK_SECTOR_SIZE];
  43   grub_ssize_t size;
  44   int key = GRUB_TERM_NO_KEY;
  45
  46   if (state[0].set)
  47     dos = 1;
  48
  49   if (argc != 1)
  50     return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
  51
  52   file = grub_file_open (args[0]);
  53   if (! file)
  54     return grub_errno;
  55
  56   while ((size = grub_file_read (file, buf, sizeof (buf))) > 0
  57          && key != GRUB_TERM_ESC)
  58     {
  59       int i;
  60
  61       for (i = 0; i < size; i++)
  62         {
  63           unsigned char c = buf[i];
  64
  65           if ((grub_isprint (c) || grub_isspace (c)) && c != '\r')
  66             grub_printf ("%c", c);
  67           else if (dos && c == '\r' && i + 1 < size && buf[i + 1] == '\n')
  68             {
  69               grub_printf ("\n");
  70               i++;
  71             }
  72           else
  73             {
  74               grub_setcolorstate (GRUB_TERM_COLOR_HIGHLIGHT);
  75               grub_printf ("<%x>", (int) c);
  76               grub_setcolorstate (GRUB_TERM_COLOR_STANDARD);
  77             }
  78         }
  79
  80       do
  81         key = grub_getkey_noblock ();
  82       while (key != GRUB_TERM_ESC && key != GRUB_TERM_NO_KEY);
  83     }
  84
  85   grub_xputs ("\n");
  86   grub_refresh ();
  87   grub_file_close (file);
  88
  89   return 0;
  90 }
  91
  92 static grub_extcmd_t cmd;
  93 \f
  94 GRUB_MOD_INIT(cat)
  95 {
  96   cmd = grub_register_extcmd ("cat", grub_cmd_cat, 0,
  97                               N_("FILE"), N_("Show the contents of a file."),
  98                               options);
  99 }
 100
 101 GRUB_MOD_FINI(cat)
 102 {
 103   grub_unregister_extcmd (cmd);
 104 }