Colony » Colony Scout » Colony Scout OS

/*

 * Copyright (c) 1987, 1993

 *        The Regents of the University of California.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#include <unistd.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

extern char        **environ;

static void usage(void);

#ifdef CMDBOX

#define main(argc, argv)        printenv_main(argc, argv)

#endif

/*

 * printenv

 *

 * Bill Joy, UCB

 * February, 1979

 */

int

main(int argc, char *argv[])

{

        char *cp, **ep;

        size_t len;

        int ch;

        while ((ch = getopt(argc, argv, "")) != EOF)

                switch(ch) {

                case '?':

                default:

                        usage();

                }

        argc -= optind;

        argv += optind;

        if (argc == 0) {

                for (ep = environ; *ep; ep++)

                        (void)printf("%s\n", *ep);

                exit(0);

        }

        len = strlen(*argv);

        for (ep = environ; *ep; ep++)

                if (!memcmp(*ep, *argv, len)) {

                        cp = *ep + len;

                        if (!*cp || *cp == '=') {

                                (void)printf("%s\n", *cp ? cp + 1 : cp);

                                exit(0);

                        }

                }

        exit(1);

}

static void

usage(void)

{

        (void)fprintf(stderr, "usage: printenv [name]\n");

        exit(1);

}