/*
 * 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.
 */

#include <stdio.h>
#include <grp.h>
#include <stdlib.h>
#include <errno.h>
#include "getent.h"


static int
putgrent(const struct group *grp, FILE *fp)
{
        char **mem;
        int rc = 0;

        if (grp == NULL) {
                return (1);
        }

        if (fprintf(fp, "%s:%s:%u:",
            grp->gr_name != NULL ? grp->gr_name : "",
            grp->gr_passwd != NULL ? grp->gr_passwd : "",
            grp->gr_gid) == EOF)
                rc = 1;

        mem = grp ->gr_mem;

        if (mem != NULL) {
                if (*mem != NULL)
                        if (fputs(*mem++, fp) == EOF)
                                rc = 1;

                while (*mem != NULL)
                        if (fprintf(fp, ",%s", *mem++) == EOF)
                                rc = 1;
        }
        if (putc('\n', fp) == EOF)
                rc = 1;
        return (rc);
}

int
dogetgr(const char **list)
{
        struct group *grp;
        int rc = EXC_SUCCESS;
        char *ptr;
        gid_t gid;

        if (list == NULL || *list == NULL) {
                while ((grp = getgrent()) != NULL)
                        (void) putgrent(grp, stdout);
        } else {
                for (; *list != NULL; list++) {
                        errno = 0;

                        /*
                         * Here we assume that the argument passed is
                         * a gid, if it can be completely transformed
                         * to a long integer. So we check for gid in
                         * the database and if we fail then we check
                         * for the group name.
                         * If the argument passed is not numeric, then
                         * we take it as the group name and proceed.
                         */
                        gid = strtoul(*list, &ptr, 10);
                        if (!(*ptr == '\0' && errno == 0) ||
                            ((grp = getgrgid(gid)) == NULL)) {
                                grp = getgrnam(*list);
                        }
                        if (grp == NULL)
                                rc = EXC_NAME_NOT_FOUND;
                        else
                                (void) putgrent(grp, stdout);
                }
        }

        return (rc);
}