60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* printenv implementation for busybox
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*
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* Copyright (C) 2005 by Erik Andersen <andersen@codepoet.org>
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* Copyright (C) 2005 by Mike Frysinger <vapier@gentoo.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config PRINTENV
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//config: bool "printenv (1.3 kb)"
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//config: default y
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//config: help
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//config: printenv is used to print all or part of environment.
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//applet:IF_PRINTENV(APPLET_NOFORK(printenv, printenv, BB_DIR_BIN, BB_SUID_DROP, printenv))
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//kbuild:lib-$(CONFIG_PRINTENV) += printenv.o
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//usage:#define printenv_trivial_usage
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//usage: "[VARIABLE]..."
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//usage:#define printenv_full_usage "\n\n"
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//usage: "Print environment VARIABLEs.\n"
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//usage: "If no VARIABLE specified, print all."
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#include "libbb.h"
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/* This is a NOFORK applet. Be very careful! */
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int printenv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int printenv_main(int argc UNUSED_PARAM, char **argv)
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{
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int exit_code = EXIT_SUCCESS;
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/* no variables specified, show whole env */
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if (!argv[1]) {
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char **e = environ;
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/* environ can be NULL! (for example, after clearenv())
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* Check for that:
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*/
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if (e)
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while (*e)
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puts(*e++);
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} else {
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/* search for specified variables and print them out if found */
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char *arg, *env;
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while ((arg = *++argv) != NULL) {
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env = getenv(arg);
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if (env)
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puts(env);
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else
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exit_code = EXIT_FAILURE;
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}
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}
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fflush_stdout_and_exit(exit_code);
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}
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