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/*-
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 * Copyright (c) 2009, Kohsuke Ohtani
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the author nor the names of any co-contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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/*
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 * environ.c - test POSIX environment variable
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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extern char **environ;
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static void
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oops(void)
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{
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        printf("oops!\n");
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        exit(1);
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}
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static void
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show_env(void)
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{
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        char **envp = environ;
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        int i;
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        for (i = 0; envp[i] != NULL; i++) {
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                printf("envp[%d]: %s\n", i, envp[i]);
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        }
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}
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int
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main(int argc, char *argv[])
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{
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        char *val;
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        printf("test environment variables\n");
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        /* Show environment passed by shell */
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        printf("show env\n");
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        show_env();
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        /* Set new viriable */
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        printf("setenv-1\n");
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        setenv("PATH", "/boot", 1);
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        show_env();
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        /* Overwirte existing viriable */
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        printf("setenv-2\n");
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        setenv("PATH", "/boot:/bin", 1);
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        show_env();
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        /* No overwirte please... */
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        printf("setenv-3\n");
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        setenv("PATH", "/boot", 0);
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        show_env();
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        /* No overwirte please... */
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        printf("setenv-4\n");
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        setenv("PATH", "/boot", 0);
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        show_env();
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        /* Get non existing variable */
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        printf("getenv-1\n");
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        val = getenv("TMP");
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        if (val != NULL)
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                oops();
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        /* Get existing variable */
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        printf("getenv-2\n");
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        val = getenv("PATH");
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        if (val == NULL)
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                oops();
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        printf("PATH=%s\n", val);
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        /* putenv */
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        printf("putenv-1\n");
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        putenv("TMP=/tmp");
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        show_env();
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        printf("putenv-2\n");
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        putenv("ABC=/abc");
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        show_env();
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        exit(0);
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}