/* Copyright (C) 1996-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <libc-lock.h>

#include <stdlib.h>

#include "nsswitch.h"

/*******************************************************************\

|* Here we assume several symbols to be defined:		   *|

|*								   *|

|* LOOKUP_TYPE   - the return type of the function		   *|

|*								   *|

|* GETFUNC_NAME  - name of the non-reentrant getXXXent function	   *|

|*								   *|

|* BUFLEN	 - size of static buffer			   *|

|*								   *|

|* Optionally the following vars can be defined:		   *|

|*								   *|

|* NEED_H_ERRNO  - an extra parameter will be passed to point to   *|

|*		   the global `h_errno' variable.		   *|

|*								   *|

\*******************************************************************/

/* To make the real sources a bit prettier.  */

#define REENTRANT_GETNAME APPEND_R (GETFUNC_NAME)

#define APPEND_R(name) APPEND_R1 (name)

#define APPEND_R1(name) name##_r

#define INTERNAL(name) INTERNAL1 (name)

#define INTERNAL1(name) __##name

/* Sometimes we need to store error codes in the `h_errno' variable.  */

#ifdef NEED_H_ERRNO

# define H_ERRNO_PARM , int *h_errnop

# define H_ERRNO_VAR &h_errno

#else

# define H_ERRNO_PARM

# define H_ERRNO_VAR NULL

#endif

/* Prototype of the reentrant version.  */

extern int INTERNAL (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer,

					 size_t buflen, LOOKUP_TYPE **result

					 H_ERRNO_PARM) attribute_hidden;

/* We need to protect the dynamic buffer handling.  */

__libc_lock_define_initialized (static, lock);

/* This points to the static buffer used.  */

libc_freeres_ptr (static char *buffer);

LOOKUP_TYPE *

GETFUNC_NAME (void)

{

  static size_t buffer_size;

  static union

  {

    LOOKUP_TYPE l;

    void *ptr;

  } resbuf;

  LOOKUP_TYPE *result;

  int save;

  /* Get lock.  */

  __libc_lock_lock (lock);

  result = (LOOKUP_TYPE *)

    __nss_getent ((getent_r_function) INTERNAL (REENTRANT_GETNAME),

		  &resbuf.ptr, &buffer, BUFLEN, &buffer_size,

		  H_ERRNO_VAR);

  save = errno;

  __libc_lock_unlock (lock);

  __set_errno (save);

  return result;

}

nss_interface_function (GETFUNC_NAME)