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/gzio.h>
  26 #include <grub/command.h>
  27
  28 static grub_err_t
  29 grub_cmd_cat (grub_command_t cmd __attribute__ ((unused)),
  30               int argc, char **args)
  31
  32 {
  33   grub_file_t file;
  34   char buf[GRUB_DISK_SECTOR_SIZE];
  35   grub_ssize_t size;
  36   int key = 0;
  37
  38   if (argc != 1)
  39     return grub_error (GRUB_ERR_BAD_ARGUMENT, "file name required");
  40
  41   file = grub_gzfile_open (args[0], 1);
  42   if (! file)
  43     return 0;
  44
  45   while ((size = grub_file_read (file, buf, sizeof (buf))) > 0
  46          && key != GRUB_TERM_ESC)
  47     {
  48       int i;
  49
  50       for (i = 0; i < size; i++)
  51         {
  52           unsigned char c = buf[i];
  53
  54           if ((grub_isprint (c) || grub_isspace (c)) && c != '\r')
  55             grub_putchar (c);
  56           else
  57             {
  58               grub_setcolorstate (GRUB_TERM_COLOR_HIGHLIGHT);
  59               grub_printf ("<%x>", (int) c);
  60               grub_setcolorstate (GRUB_TERM_COLOR_STANDARD);
  61             }
  62         }
  63
  64       while (grub_checkkey () >= 0 &&
  65              (key = GRUB_TERM_ASCII_CHAR (grub_getkey ())) != GRUB_TERM_ESC)
  66         ;
  67     }
  68
  69   grub_putchar ('\n');
  70   grub_refresh ();
  71   grub_file_close (file);
  72
  73   return 0;
  74 }
  75
  76 static grub_command_t cmd;
  77 \f
  78 GRUB_MOD_INIT(cat)
  79 {
  80   cmd = grub_register_command_p1 ("cat", grub_cmd_cat,
  81                                   "cat FILE", "Show the contents of a file.");
  82 }
  83
  84 GRUB_MOD_FINI(cat)
  85 {
  86   grub_unregister_command (cmd);
  87 }