grub/grub-core/commands/regexp.c

/* regexp.c -- The regexp command.  */
/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 2005,2007  Free Software Foundation, Inc.
 *
 *  GRUB is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  GRUB is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <grub/dl.h>
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/command.h>
#include <grub/i18n.h>
#include <grub/script_sh.h>
#include <regex.h>

static grub_err_t
grub_cmd_regexp (grub_command_t cmd __attribute__ ((unused)),
		 int argc, char **args)
{
  int argn = 0;
  int matches = 0;
  regex_t regex;
  int ret;
  grub_size_t s;
  char *comperr;
  grub_err_t err;

  if (argc != 2)
    return grub_error (GRUB_ERR_BAD_ARGUMENT, "2 arguments expected");

  ret = regcomp (&regex, args[0], RE_SYNTAX_GNU_AWK);
  if (ret)
    goto fail;

  ret = regexec (&regex, args[1], 0, 0, 0);
  if (!ret)
    {
      regfree (&regex);
      return GRUB_ERR_NONE;
    }

 fail:
  s = regerror (ret, &regex, 0, 0);
  comperr = grub_malloc (s);
  if (!comperr)
    {
      regfree (&regex);
      return grub_errno;
    }
  regerror (ret, &regex, comperr, s);
  err = grub_error (GRUB_ERR_TEST_FAILURE, "%s", comperr);
  regfree (&regex);
  grub_free (comperr);
  return err;
}

static grub_command_t cmd;

GRUB_MOD_INIT(regexp)
{
  cmd = grub_register_command ("regexp", grub_cmd_regexp,
			       N_("REGEXP STRING"),
			       N_("Test if REGEXP matches STRING."));

  /* Setup GRUB script wildcard translator.  */
  grub_wildcard_translator = &grub_filename_translator;
}

GRUB_MOD_FINI(regexp)
{
  grub_unregister_command (cmd);
  grub_wildcard_translator = 0;
}