commands/test.c

   1 /* test.c -- The test command..  */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2005,2007  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/misc.h>
  24 #include <grub/mm.h>
  25 #include <grub/env.h>
  26
  27 static grub_err_t
  28 grub_cmd_test (struct grub_arg_list *state __attribute__ ((unused)), int argc,
  29                char **args)
  30
  31 {
  32   char *eq;
  33   char *eqis;
  34
  35   /* XXX: No fancy expression evaluation yet.  */
  36
  37   if (argc == 0)
  38     return 0;
  39
  40   eq = grub_strdup (args[0]);
  41   eqis = grub_strchr (eq, '=');
  42   if (! eqis)
  43     return 0;
  44
  45   *eqis = '\0';
  46   eqis++;
  47   /* Check an expression in the form `A=B'.  */
  48   if (grub_strcmp (eq, eqis))
  49     grub_error (GRUB_ERR_TEST_FAILURE, "false");
  50   grub_free (eq);
  51
  52   return grub_errno;
  53 }
  54
  55
  56 \f
  57 GRUB_MOD_INIT(test)
  58 {
  59   (void)mod;                    /* To stop warning. */
  60   grub_register_command ("[", grub_cmd_test, GRUB_COMMAND_FLAG_CMDLINE,
  61                          "[ EXPRESSION ]", "Evaluate an expression", 0);
  62   grub_register_command ("test", grub_cmd_test, GRUB_COMMAND_FLAG_CMDLINE,
  63                          "test EXPRESSION", "Evaluate an expression", 0);
  64 }
  65
  66 GRUB_MOD_FINI(test)
  67 {
  68   grub_unregister_command ("[");
  69   grub_unregister_command ("test");
  70 }