/*
 * 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 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 */