/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 */

/*
 * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
 */

#include <stdio.h>
#include <stdlib.h>
#include <libgen.h>
#include <uuid/uuid.h>
#include <getopt.h>
#include <locale.h>

static char *progname;
static int rflag, tflag;
static char uu_string[UUID_PRINTABLE_STRING_LENGTH];

static void
usage(void)
{
        (void) fprintf(stderr, gettext(
            "Usage: %s [-r | -t] [-o filename]\n"), progname);
        exit(1);
}

int
main(int argc, char *argv[])
{
        FILE *out;
        uuid_t  uu = { 0 };
        int c;

        (void) setlocale(LC_ALL, "");

#if !defined(TEXT_DOMAIN)
#define TEXT_DOMAIN "SYS_TEST"
#endif
        (void) textdomain(TEXT_DOMAIN);

        progname = basename(argv[0]);
        out = stdout;
        while ((c = getopt(argc, argv, ":rto:")) != EOF) {
                switch ((char)c) {
                case 'r':
                        rflag++;
                        break;
                case 't':
                        tflag++;
                        break;
                case 'o':
                        if ((out = fopen(optarg, "w")) == NULL) {
                                (void) fprintf(stderr, gettext(
                                    "%s: cannot open %s\n"),
                                    progname, optarg);
                                return (1);
                        }
                        break;
                case '?': /* fallthrough */
                default:
                        usage();
                }
        }

        if ((rflag && tflag) || optind != argc) {
                usage();
        }

        if (rflag) {
                /* DCE version 4 */
                uuid_generate_random(uu);
        } else if (tflag) {
                /* DCE version 1 */
                uuid_generate_time(uu);
        } else {
                uuid_generate(uu);
        }

        if (uuid_is_null(uu) != 0) {
                (void) fprintf(stderr, gettext(
                    "%s: failed to "
                    "generate uuid\n"), progname);
                exit(1);
        }

        uuid_unparse(uu, uu_string);

        (void) fprintf(out, "%s\n", uu_string);

        if (out != NULL && out != stdout)
                (void) fclose(out);

        return (0);
}