/* 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 <ctype.h>

#include <errno.h>

#include <grp.h>

#include <stdio.h>

#include <libio/iolibio.h>

#define flockfile(s) _IO_flockfile (s)

#define funlockfile(s) _IO_funlockfile (s)

/* Define a line parsing function using the common code

   used in the nss_files module.  */

#define STRUCTURE	group

#define ENTNAME		grent

struct grent_data {};

#define TRAILING_LIST_MEMBER		gr_mem

#define TRAILING_LIST_SEPARATOR_P(c)	((c) == ',')

#include <nss/nss_files/files-parse.c>

LINE_PARSER

(,

 STRING_FIELD (result->gr_name, ISCOLON, 0);

 if (line[0] == '\0'

     && (result->gr_name[0] == '+' || result->gr_name[0] == '-'))

   {

     result->gr_passwd = NULL;

     result->gr_gid = 0;

   }

 else

   {

     STRING_FIELD (result->gr_passwd, ISCOLON, 0);

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

       INT_FIELD_MAYBE_NULL (result->gr_gid, ISCOLON, 0, 10, , 0)

     else

       INT_FIELD (result->gr_gid, ISCOLON, 0, 10,)

   }

 )

/* Read one entry from the given stream.  */

int

__fgetgrent_r (FILE *stream, struct group *resbuf, char *buffer, size_t buflen,

	       struct group **result)

{

  char *p;

  int parse_result;

  flockfile (stream);

  do

    {

      buffer[buflen - 1] = '\xff';

      p = fgets_unlocked (buffer, buflen, stream);

      if (__builtin_expect (p == NULL, 0) && feof_unlocked (stream))

	{

	  funlockfile (stream);

	  *result = NULL;

	  __set_errno (ENOENT);

	  return errno;

	}

      if (__builtin_expect (p == NULL, 0) || buffer[buflen - 1] != '\xff')

	{

	  funlockfile (stream);

	  *result = NULL;

	  __set_errno (ERANGE);

	  return errno;

	}

      /* Skip leading blanks.  */

      while (isspace (*p))

	++p;

    } while (*p == '\0' || *p == '#'	/* Ignore empty and comment lines.  */

	     /* Parse the line.  If it is invalid, loop to

		get the next line of the file to parse.  */

	     || ! (parse_result = parse_line (p, resbuf,

					      (void *) buffer, buflen,

					      &errno)));

  funlockfile (stream);

  if (__builtin_expect (parse_result, 0) == -1)

    {

      /* The parser ran out of space.  */

      *result = NULL;

      return errno;

    }

  *result = resbuf;

  return 0;

}

weak_alias (__fgetgrent_r, fgetgrent_r)