commands/read.c

   1 /* read.c - Command to read variables from user.  */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2006,2007,2008  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/misc.h>
  22 #include <grub/mm.h>
  23 #include <grub/env.h>
  24 #include <grub/term.h>
  25 #include <grub/types.h>
  26 #include <grub/command.h>
  27
  28 static char *
  29 grub_getline (void)
  30 {
  31   int i;
  32   char *line;
  33   char *tmp;
  34   char c;
  35
  36   i = 0;
  37   line = grub_malloc (1 + i + sizeof('\0'));
  38   if (! line)
  39     return NULL;
  40
  41   while (1)
  42     {
  43       c = grub_getkey ();
  44       if ((c == '\n') || (c == '\r'))
  45         break;
  46
  47       line[i] = c;
  48       if (grub_isprint (c))
  49         grub_putchar (c);
  50       i++;
  51       tmp = grub_realloc (line, 1 + i + sizeof('\0'));
  52       if (! tmp)
  53         {
  54           grub_free (line);
  55           return NULL;
  56         }
  57       line = tmp;
  58     }
  59   line[i] = '\0';
  60
  61   return line;
  62 }
  63
  64 static grub_err_t
  65 grub_cmd_read (grub_command_t cmd UNUSED, int argc, char **args)
  66 {
  67   char *line = grub_getline ();
  68   if (! line)
  69     return grub_errno;
  70   if (argc > 0)
  71     grub_env_set (args[0], line);
  72
  73   grub_free (line);
  74   return 0;
  75 }
  76
  77 static grub_command_t cmd;
  78 \f
  79 GRUB_MOD_INIT(read)
  80 {
  81   cmd = grub_register_command ("read", grub_cmd_read,
  82                                "read [ENVVAR]",
  83                                "Set variable with user input");
  84 }
  85
  86 GRUB_MOD_FINI(read)
  87 {
  88   grub_unregister_command (cmd);
  89 }