cmd/env/env.c

/*
 * 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 (c) 2012, Joyent, Inc. All rights reserved.
 */
/*
 * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
 */

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

/*
 *  env [ - ] [ name=value ]... [command arg...]
 *  set environment, then execute command (or print environment)
 *  - says start fresh, otherwise merge with inherited environment
 */

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


static  void    Usage();
extern  char    **environ;


int
main(int argc, char **argv)
{
    char    **p;
    int opt;
    int i;


    (void) setlocale(LC_ALL, "");

#if !defined(TEXT_DOMAIN)   /* Should be defined by cc -D */
#define TEXT_DOMAIN "SYS_TEST"  /* Use this only if it weren't */
#endif
    (void) textdomain(TEXT_DOMAIN);

    /* check for non-standard "-" option */
    if ((argc > 1) && (strcmp(argv[1], "-")) == 0) {
        (void) clearenv();
        for (i = 1; i < argc; i++)
            argv[i] = argv[i+1];
        argc--;
    }

    /* get options */
    while ((opt = getopt(argc, argv, "i")) != EOF) {
        switch (opt) {
        case 'i':
            (void) clearenv();
            break;

        default:
            Usage();
        }
    }

    /* get environment strings */
    while (argv[optind] != NULL && strchr(argv[optind], '=') != NULL) {
        if (putenv(argv[optind])) {
            (void) perror(argv[optind]);
            exit(1);
        }
        optind++;
    }

    /* if no utility, output environment strings */
    if (argv[optind] == NULL) {
        p = environ;
        while (*p != NULL)
            (void) puts(*p++);
    } else {
        (void) execvp(argv[optind],  &argv[optind]);
        (void) fprintf(stderr, "%s: %s: %s\n", argv[0], argv[optind],
            strerror(errno));
        exit(((errno == ENOENT) || (errno == ENOTDIR)) ? 127 : 126);
    }
    return (0);
}


static  void
Usage()
{
    (void) fprintf(stderr, gettext(
        "Usage: env [-i] [name=value ...] [utility [argument ...]]\n"
        "       env [-] [name=value ...] [utility [argument ...]]\n"));
    exit(1);
}