/* Copyright (C) 1991-2018 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 <nss.h>

#include <stdio.h>

#include <string.h>

#include <grp.h>

#define flockfile(s) _IO_flockfile (s)

#define funlockfile(s) _IO_funlockfile (s)

#define _S(x)	x ? x : ""

/* Write an entry to the given stream.

   This must know the format of the group file.  */

int

putgrent (const struct group *gr, FILE *stream)

{

  int retval;

  if (__glibc_unlikely (gr == NULL) || __glibc_unlikely (stream == NULL)

      || gr->gr_name == NULL || !__nss_valid_field (gr->gr_name)

      || !__nss_valid_field (gr->gr_passwd)

      || !__nss_valid_list_field (gr->gr_mem))

    {

      __set_errno (EINVAL);

      return -1;

    }

  flockfile (stream);

  if (gr->gr_name[0] == '+' || gr->gr_name[0] == '-')

    retval = fprintf (stream, "%s:%s::",

		      gr->gr_name, _S (gr->gr_passwd));

  else

    retval = fprintf (stream, "%s:%s:%lu:",

		      gr->gr_name, _S (gr->gr_passwd),

		      (unsigned long int) gr->gr_gid);

  if (__builtin_expect (retval, 0) < 0)

    {

      funlockfile (stream);

      return -1;

    }

  if (gr->gr_mem != NULL)

    {

      for (size_t i = 0; gr->gr_mem[i] != NULL; i++)

	if (fprintf (stream, i == 0 ? "%s" : ",%s", gr->gr_mem[i]) < 0)

	  {

	    /* What else can we do?  */

	    funlockfile (stream);

	    return -1;

	  }

    }

  retval = fputc_unlocked ('\n', stream);

  funlockfile (stream);

  return retval < 0 ? -1 : 0;

}