mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-11-23 11:49:39 +00:00
60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/* 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.
|
|
*/
|
|
//config:config PRINTENV
|
|
//config: bool "printenv (1.3 kb)"
|
|
//config: default y
|
|
//config: help
|
|
//config: printenv is used to print all or part of environment.
|
|
|
|
//applet:IF_PRINTENV(APPLET_NOFORK(printenv, printenv, BB_DIR_BIN, BB_SUID_DROP, printenv))
|
|
|
|
//kbuild:lib-$(CONFIG_PRINTENV) += printenv.o
|
|
|
|
//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);
|
|
}
|