blob: fbd64945d0e4351fa20f2b3ce7664b691ce32665
| 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 | //config:config PRINTENV |
| 11 | //config: bool "printenv" |
| 12 | //config: default y |
| 13 | //config: help |
| 14 | //config: printenv is used to print all or part of environment. |
| 15 | |
| 16 | //applet:IF_PRINTENV(APPLET_NOFORK(printenv, printenv, BB_DIR_BIN, BB_SUID_DROP, printenv)) |
| 17 | |
| 18 | //kbuild:lib-$(CONFIG_PRINTENV) += printenv.o |
| 19 | |
| 20 | //usage:#define printenv_trivial_usage |
| 21 | //usage: "[VARIABLE]..." |
| 22 | //usage:#define printenv_full_usage "\n\n" |
| 23 | //usage: "Print environment VARIABLEs.\n" |
| 24 | //usage: "If no VARIABLE specified, print all." |
| 25 | |
| 26 | #include "libbb.h" |
| 27 | |
| 28 | /* This is a NOFORK applet. Be very careful! */ |
| 29 | |
| 30 | int printenv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 31 | int printenv_main(int argc UNUSED_PARAM, char **argv) |
| 32 | { |
| 33 | int exit_code = EXIT_SUCCESS; |
| 34 | |
| 35 | /* no variables specified, show whole env */ |
| 36 | if (!argv[1]) { |
| 37 | char **e = environ; |
| 38 | |
| 39 | /* environ can be NULL! (for example, after clearenv()) |
| 40 | * Check for that: |
| 41 | */ |
| 42 | if (e) |
| 43 | while (*e) |
| 44 | puts(*e++); |
| 45 | } else { |
| 46 | /* search for specified variables and print them out if found */ |
| 47 | char *arg, *env; |
| 48 | |
| 49 | while ((arg = *++argv) != NULL) { |
| 50 | env = getenv(arg); |
| 51 | if (env) |
| 52 | puts(env); |
| 53 | else |
| 54 | exit_code = EXIT_FAILURE; |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | fflush_stdout_and_exit(exit_code); |
| 59 | } |
| 60 |