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+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));
+ }
+}