/*
 * 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) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */

/*LINTLIBRARY*/

#include        <sys/types.h>
#include        <stdio.h>
#include        <stdlib.h>
#include        <ctype.h>
#include        <errno.h>
#include        <limits.h>
#include        <sys/param.h>
#include        <users.h>
#include        <userdefs.h>

extern int valid_gid(gid_t, struct group **);

static int isalldigit(char *);

/*
 *      validate a group name or number and return the appropriate
 *      group structure for it.
 */
int
valid_group(char *group, struct group **gptr, int *warning)
{
        int r, warn;
        long l;
        char *ptr;
        struct group *grp;

        *warning = 0;

        if (!isalldigit(group))
                return (valid_gname(group, gptr, warning));

        /*
         * There are only digits in group name.
         * strtol() doesn't return negative number here.
         */
        errno = 0;
        l = strtol(group, &ptr, 10);
        if ((l == LONG_MAX && errno == ERANGE) || l > MAXUID) {
                r = TOOBIG;
        } else {
                if ((r = valid_gid((gid_t)l, &grp)) == NOTUNIQUE) {
                        /* It is a valid existing gid */
                        if (gptr != NULL)
                                *gptr = grp;
                        return (NOTUNIQUE);
                }
        }
        /*
         * It's all digit, but not a valid gid nor an existing gid.
         * There might be an existing group name of all digits.
         */
        if (valid_gname(group, &grp, &warn) == NOTUNIQUE) {
                /* It does exist */
                *warning = warn;
                if (gptr != NULL)
                        *gptr = grp;
                return (NOTUNIQUE);
        }
        /*
         * It isn't either existing gid or group name. We return the
         * error code from valid_gid() assuming that given string
         * represents an integer GID.
         */
        return (r);
}

static int
isalldigit(char *str)
{
        while (*str != '\0') {
                if (!isdigit((unsigned char)*str))
                        return (0);
                str++;
        }
        return (1);
}