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

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 1.2 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * printenv implementation for busybox
4 *
5 * Copyright (C) 2005 by Erik Andersen <andersen@codepoet.org>
6 * Copyright (C) 2005 by Mike Frysinger <vapier@gentoo.org>
7 *
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
9 */
10
11//usage:#define printenv_trivial_usage
12//usage:       "[VARIABLE]..."
13//usage:#define printenv_full_usage "\n\n"
14//usage:       "Print environment VARIABLEs.\n"
15//usage:       "If no VARIABLE specified, print all."
16
17#include "libbb.h"
18
19/* This is a NOFORK applet. Be very careful! */
20
21int printenv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
22int printenv_main(int argc UNUSED_PARAM, char **argv)
23{
24    int exit_code = EXIT_SUCCESS;
25
26    /* no variables specified, show whole env */
27    if (!argv[1]) {
28        char **e = environ;
29
30        /* environ can be NULL! (for example, after clearenv())
31         * Check for that:
32         */
33        if (e)
34            while (*e)
35                puts(*e++);
36    } else {
37        /* search for specified variables and print them out if found */
38        char *arg, *env;
39
40        while ((arg = *++argv) != NULL) {
41            env = getenv(arg);
42            if (env)
43                puts(env);
44            else
45                exit_code = EXIT_FAILURE;
46        }
47    }
48
49    fflush_stdout_and_exit(exit_code);
50}
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