This file is builtin.def, from which is created builtin.c.
It implements the builtin "builtin" in Bash.

Copyright (C) 1987-2017 Free Software Foundation, Inc.

This file is part of GNU Bash, the Bourne Again SHell.

Bash 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.

Bash 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 Bash.  If not, see <http://www.gnu.org/licenses/>.

$PRODUCES builtin.c

$BUILTIN builtin
$FUNCTION builtin_builtin
$SHORT_DOC builtin [shell-builtin [arg ...]]
Execute shell builtins.

Execute SHELL-BUILTIN with arguments ARGs without performing command
lookup.  This is useful when you wish to reimplement a shell builtin
as a shell function, but need to execute the builtin within the function.

Exit Status:
Returns the exit status of SHELL-BUILTIN, or false if SHELL-BUILTIN is
not a shell builtin.
$END
#include <config.h>

#if defined (HAVE_UNISTD_H)
#  ifdef _MINIX
#    include <sys/types.h>
#  endif
#  include <unistd.h>
#endif

#include "../shell.h"
#include "../execute_cmd.h"
#include "common.h"
#include "bashgetopt.h"

/* Run the command mentioned in list directly, without going through the
   normal alias/function/builtin/filename lookup process. */
int
builtin_builtin (list)
     WORD_LIST *list;
{
  sh_builtin_func_t *function;
  register char *command;

  if (no_options (list))
    return (EX_USAGE);
  list = loptend;	/* skip over possible `--' */

  if (list == 0)
    return (EXECUTION_SUCCESS);

  command = list->word->word;
#if defined (DISABLED_BUILTINS)
  function = builtin_address (command);
#else /* !DISABLED_BUILTINS */
  function = find_shell_builtin (command);
#endif /* !DISABLED_BUILTINS */

  if (function == 0)
    {
      sh_notbuiltin (command);
      return (EXECUTION_FAILURE);
    }
  else
    {
      this_command_name = command;
      this_shell_builtin = function;	/* overwrite "builtin" as this builtin */
      list = list->next;
      return ((*function) (list));
    }
}