blob: c0c5e197c9af60734d1fa62ab6ce3fd99948d5b9
1 | /* printenv -- minimal clone of BSD printenv(1). |
2 | |
3 | usage: printenv [varname] |
4 | |
5 | Chet Ramey |
6 | chet@po.cwru.edu |
7 | */ |
8 | |
9 | /* Copyright (C) 1997-2002 Free Software Foundation, Inc. |
10 | |
11 | This file is part of GNU Bash, the Bourne Again SHell. |
12 | |
13 | Bash is free software; you can redistribute it and/or modify it under |
14 | the terms of the GNU General Public License as published by the Free |
15 | Software Foundation; either version 2, or (at your option) any later |
16 | version. |
17 | |
18 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY |
19 | WARRANTY; without even the implied warranty of MERCHANTABILITY or |
20 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
21 | for more details. |
22 | |
23 | You should have received a copy of the GNU General Public License along |
24 | with Bash; see the file COPYING. If not, write to the Free Software |
25 | Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
26 | |
27 | #include <stdio.h> |
28 | #include <stdlib.h> |
29 | #include <string.h> |
30 | |
31 | extern char **environ; |
32 | |
33 | int |
34 | main (argc, argv) |
35 | int argc; |
36 | char **argv; |
37 | { |
38 | register char **envp, *eval; |
39 | int len; |
40 | |
41 | argv++; |
42 | argc--; |
43 | |
44 | /* printenv */ |
45 | if (argc == 0) |
46 | { |
47 | for (envp = environ; *envp; envp++) |
48 | puts (*envp); |
49 | exit(EXIT_SUCCESS); |
50 | } |
51 | |
52 | /* printenv varname */ |
53 | len = strlen (*argv); |
54 | for (envp = environ; *envp; envp++) |
55 | { |
56 | if (**argv == **envp && strncmp (*envp, *argv, len) == 0) |
57 | { |
58 | eval = *envp + len; |
59 | /* If the environment variable doesn't have an `=', ignore it. */ |
60 | if (*eval == '=') |
61 | { |
62 | puts (eval + 1); |
63 | exit(EXIT_SUCCESS); |
64 | } |
65 | } |
66 | } |
67 | exit(EXIT_FAILURE); |
68 | } |
69 |