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