/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */


/*
 * Copyright 2000-2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
**      nice
*/


#include        <stdio.h>
#include        <locale.h>
#include        <stdlib.h>
#include        <string.h>
#include        <unistd.h>
#include        <errno.h>


static void usage(void);

int
main(int argc, char *argv[])
{
        long    nicarg = 10;

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


        if (argc < 2)
                usage();


        if (argv[1][0] == '-') {
                if (strcmp(argv[1], "--") == 0) {
                        argv++;
                        argc--;
                } else {
                        register char   *p = argv[1];
                        char    *nicarg_str;
                        char    *end_ptr;

                        if (*++p == 'n') {      /* -n55 new form, XCU4 */
                                /*
                                 * for situations like -n-10
                                 * else case assigns p instead of argv
                                 */
                                if (!(*++p)) {
                                        /* Next arg is priority */
                                        argv++;
                                        argc--;
                                        if (argc < 2)
                                                usage();
                                        nicarg_str = argv[1];
                                } else {
                                        /* Priority embedded eg. -n-10 */
                                        nicarg_str = p;
                                }
                        } else {        /* -55 obs form, XCU4 */
                                nicarg_str = &argv[1][1];
                        }
                        nicarg = strtol(nicarg_str, &end_ptr, 10);
                        if (*end_ptr) {
                                (void) fprintf(stderr,
                                gettext("nice: argument must be numeric.\n"));
                                usage();
                        }

                        if( --argc < 2 )
                                usage();

                        argv++;
                        if (strcmp(argv[1], "--") == 0) {
                                argv++;
                                argc--;
                        }
                }
        }

        if (argc < 2)
                usage();

        errno = 0;
        if (nice(nicarg) == -1) {
                /*
                 * Could be an error or a legitimate return value.
                 * The only error we care about is EINVAL, which will
                 * be returned by the scheduling class we are in if
                 * nice is invalid for this class.
                 * For any error other than EINVAL
                 * we will go ahead and exec the command even though
                 * the priority change failed.
                 */
                if (errno == EINVAL) {
                        (void) fprintf(stderr, gettext(
                            "nice: invalid operation; "
                            "scheduling class does not support nice\n"));
                        return (2);
                }
        }
        (void) execvp(argv[1], &argv[1]);
        (void) fprintf(stderr, gettext("%s: %s\n"), strerror(errno), argv[1]);
        /*
         * POSIX.2 exit status:
         * 127 if utility is not found.
         * 126 if utility cannot be invoked.
         */
        return (errno == ENOENT || errno == ENOTDIR ? 127 : 126);
}

static void
usage()
{
        (void) fprintf(stderr,
        gettext("nice: usage: nice [-n increment] utility [argument ...]\n"));
        exit(2);
}