source: MondoRescue/branches/3.2/mindi-busybox/coreutils/printenv.c@ 3232

/* vi: set sw=4 ts=4: */
/*
 * printenv implementation for busybox
 *
 * Copyright (C) 2005 by Erik Andersen <andersen@codepoet.org>
 * Copyright (C) 2005 by Mike Frysinger <vapier@gentoo.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

//usage:#define printenv_trivial_usage
//usage:       "[VARIABLE]..."
//usage:#define printenv_full_usage "\n\n"
//usage:       "Print environment VARIABLEs.\n"
//usage:       "If no VARIABLE specified, print all."

#include "libbb.h"

/* This is a NOFORK applet. Be very careful! */

int printenv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int printenv_main(int argc UNUSED_PARAM, char **argv)
{
    int exit_code = EXIT_SUCCESS;

    /* no variables specified, show whole env */
    if (!argv[1]) {
        char **e = environ;

        /* environ can be NULL! (for example, after clearenv())
         * Check for that:
         */
        if (e)
            while (*e)
                puts(*e++);
    } else {
        /* search for specified variables and print them out if found */
        char *arg, *env;

        while ((arg = *++argv) != NULL) {
            env = getenv(arg);
            if (env)
                puts(env);
            else
                exit_code = EXIT_FAILURE;
        }
    }

    fflush_stdout_and_exit(exit_code);
}