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/*

 * initgroups.c - This file is part of the libc-8086/grp package for ELKS,

 * Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>.

 *

 *  This library is free software; you can redistribute it and/or

 *  modify it under the terms of the GNU Library General Public

 *  License as published by the Free Software Foundation; either

 *  version 2 of the License, or (at your option) any later version.

 *

 *  This 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

 *  Library General Public License for more details.

 *

 *  You should have received a copy of the GNU Library General Public

 *  License along with this library; if not, write to the Free

 *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 *

 */

#include <unistd.h>

#include <string.h>

#include <fcntl.h>

#include <grp.h>

#include "config.h"

int

initgroups(__const char * user, gid_t gid)

{

  register struct group * group;

#ifndef GR_DYNAMIC_GROUP_LIST

  gid_t group_list[GR_MAX_GROUPS];

#else

  gid_t * group_list=NULL;

#endif

  register char ** tmp_mem;

  int num_groups;

  int grp_fd;

  if ((grp_fd=open("/etc/group", O_RDONLY))<0)

    return -1;

  num_groups=0;

#ifdef GR_DYNAMIC_GROUP_LIST

  group_list=(gid_t *) realloc(group_list, 1);

#endif

  group_list[num_groups]=gid;

#ifndef GR_DYNAMIC_GROUP_LIST

  while (num_groups<GR_MAX_GROUPS &&

         (group=__getgrent(grp_fd))!=NULL)

#else

  while ((group=__getgrent(grp_fd))!=NULL)

#endif      

    {

      if (group->gr_gid!=gid);

        {

          tmp_mem=group->gr_mem;

          while(*tmp_mem!=NULL)

            {

              if (!strcmp(*tmp_mem, user))

                {

                  num_groups++;

#ifdef GR_DYNAMIC_GROUP_LIST  

                  group_list=(gid_t *)realloc(group_list,

                                              num_groups*sizeof(gid_t *));

#endif            

                  group_list[num_groups]=group->gr_gid;

                }

              tmp_mem++;

            }

        }

    }

  close(grp_fd);

  return setgroups(num_groups, group_list);

}