Regexp support

commands/regexp.c

@@ -0,0 +1,79 @@
+/* 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/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,
+			       "REGEXP STRING",
+			       "Test if REGEXP matches STRING.");
+}
+
+GRUB_MOD_FINI(regexp)
+{
+  grub_unregister_command (cmd);
+}