/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

/*	Copyright (c) 1988 AT&T	*/

/*	  All Rights Reserved  	*/

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#pragma weak _getgrnam	= getgrnam

#pragma weak _getgrgid	= getgrgid

#include "lint.h"

#include <sys/types.h>

#include <grp.h>

#include <nss_dbdefs.h>

#include <stdio.h>

#include "tsd.h"

#ifdef	NSS_INCLUDE_UNSAFE

extern size_t _nss_get_bufsizes(int arg);

/*

 * Ye olde non-reentrant interface (MT-unsafe, caveat utor)

 */

static void

free_grbuf(void *arg)

{

	nss_XbyY_buf_t **buffer = arg;

	NSS_XbyY_FREE(buffer);

}

static nss_XbyY_buf_t *

get_grbuf(int max_buf)

{

	nss_XbyY_buf_t **buffer =

	    tsdalloc(_T_GRBUF, sizeof (nss_XbyY_buf_t *), free_grbuf);

	nss_XbyY_buf_t *b;

	size_t	blen;

	if (buffer == NULL)

		return (NULL);

	if (max_buf == 0)

		blen = _nss_get_bufsizes(0);		/* default size */

	else

		blen = sysconf(_SC_GETGR_R_SIZE_MAX);	/* max size */

	if (*buffer) {

		if ((*buffer)->buflen >= blen)	/* existing size fits */

			return (*buffer);

		NSS_XbyY_FREE(buffer);		/* existing is too small */

	}

	b = NSS_XbyY_ALLOC(buffer, sizeof (struct group), blen);

	return (b);

}

struct group *

getgrgid(gid_t gid)

{

	nss_XbyY_buf_t	*b = get_grbuf(0);

	struct group *ret;

	if (b == NULL)

		return (NULL);

	ret = getgrgid_r(gid, b->result, b->buffer, b->buflen);

	if (ret == NULL && errno == ERANGE) {

		b = get_grbuf(1);

		if (b == NULL)

			return (NULL);

		ret = getgrgid_r(gid, b->result, b->buffer, b->buflen);

	}

	return (ret);

}

struct group *

getgrnam(const char *nam)

{

	nss_XbyY_buf_t	*b = get_grbuf(0);

	struct group *ret;

	if (b == NULL)

		return (NULL);

	ret = getgrnam_r(nam, b->result, b->buffer, b->buflen);

	if (ret == NULL && errno == ERANGE && nam != NULL) {

		b = get_grbuf(1);

		if (b == NULL)

			return (NULL);

		ret = getgrnam_r(nam, b->result, b->buffer, b->buflen);

	}

	return (ret);

}

struct group *

getgrent(void)

{

	nss_XbyY_buf_t	*b = get_grbuf(1);

	return (b == NULL ? NULL :

	    getgrent_r(b->result, b->buffer, b->buflen));

}

struct group *

fgetgrent(FILE *f)

{

	nss_XbyY_buf_t	*b = get_grbuf(1);

	return (b == NULL ? NULL :

	    fgetgrent_r(f, b->result, b->buffer, b->buflen));

}

#endif	/* NSS_INCLUDE_UNSAFE */